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WO2019117482A1 - Résine hautement absorbante et procédé pour sa production - Google Patents

Résine hautement absorbante et procédé pour sa production Download PDF

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Publication number
WO2019117482A1
WO2019117482A1 PCT/KR2018/013917 KR2018013917W WO2019117482A1 WO 2019117482 A1 WO2019117482 A1 WO 2019117482A1 KR 2018013917 W KR2018013917 W KR 2018013917W WO 2019117482 A1 WO2019117482 A1 WO 2019117482A1
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WO
WIPO (PCT)
Prior art keywords
linking
superabsorbent resin
resin
meth
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/013917
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English (en)
Korean (ko)
Inventor
이혜민
손정민
김연수
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Chem Ltd
Original Assignee
LG Chem Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020180139102A external-priority patent/KR102566440B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Priority to JP2019536818A priority Critical patent/JP7433047B2/ja
Priority to CN201880005698.2A priority patent/CN110167997B/zh
Priority to BR112019014971-6A priority patent/BR112019014971B1/pt
Priority to EP18884837.8A priority patent/EP3540001B1/fr
Priority to US16/475,940 priority patent/US11406963B2/en
Publication of WO2019117482A1 publication Critical patent/WO2019117482A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/075—Macromolecular gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof

Definitions

  • the present invention relates to a superabsorbent resin and a method for producing the same.
  • the present invention relates to a superabsorbent resin which not only exhibits excellent basic absorption performance but also exhibits improved absorption rate and liquid permeability, and a method for producing the same.
  • Super Absorbent Polymer is a synthetic polymer material capable of absorbing moisture from about 500 to 1,000 times the weight of lanzai, and each developer can use SAM (Super Absorbent Material), AGM
  • SAM Super Absorbent Material
  • AGM Super Absorbent Material
  • the superabsorbent resin In recent years, as the demand for a thin diaper increases, the content of the fibrous material such as pulp in the diaper tends to decrease, and the proportion of the super-absorbent resin tends to increase relatively. Therefore, there is a need for the superabsorbent resin to combine the performance of the fiber material of the diaper. For this purpose, the superabsorbent resin must have a high absorption capacity as well as a high absorption rate and liquid permeability. 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the superabsorbent resin in order for the superabsorbent resin to exhibit the above-mentioned high liquid-permeability, it is basically necessary that the superabsorbent resin be retained in its shape even after the superabsorbent resin particles are absorbed and swollen to retain the voids between the particles and the particles. This is because the pores between the particles act as a flow path to ensure excellent liquid permeability of the superabsorbent resin. For this reason, in order to provide a highly water-permeable resin exhibiting improved permeability and other excellent physical properties, it is necessary that such an aqueous resin be produced to exhibit a higher gel strength through surface 10 crosslinking or the like.
  • the superabsorbent resin In order for the superabsorbent resin to exhibit a higher absorption rate, it is necessary to exhibit a porous structure having a large surface area and having a large number of micropores formed therein.
  • a highly absorbent resin having such a porous structure or the like has been produced by applying a foaming agent or the like.
  • surface cross-linking is uneven in the surface cross-linking after the pulverization or in the mixing of additives for improving the physical properties, In many cases.
  • liquid tube 20 is 0 when the ina common lowering other properties such as the ability to absorb.
  • the present invention is to provide a superabsorbent resin which exhibits not only superior absorption properties but also improved absorption rate and liquid permeability, and a method for producing the same.
  • a base resin powder comprising a first crosslinked polymer of an unsaturated monomer
  • the first crosslinkable polymer is formed on the base resin powder and the first crosslinked polymer comprises a surface crosslinking polymer comprising a second crosslinked polymer additionally crosslinked via a surface crosslinking agent,
  • the superabsorbent resin comprises 10% or more of superabsorbent resin particles having an aspect ratio defined by a shortest diameter / longest diameter of each superabsorbent resin particle of less than 0.5,
  • the present invention also relates to a method for producing a water-soluble ethylenically unsaturated monomer, which comprises crosslinking a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of a blowing agent and an internal cross-linking agent to form a hydrous gel polymer comprising the first cross-linked polymer;
  • BEST MODE FOR CARRYING OUT THE INVENTION a superabsorbent resin according to a specific embodiment of the present invention and a method for producing the same will be described in detail.
  • Constant &quot refers to including any and all components (or components) without limitation, and can not be construed as excluding the addition of other components (or components).
  • the present invention relates to a process for preparing a water-soluble ethylenically unsaturated monomer having at least partly neutralized acidic groups, 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the first cross-linked polymer comprises a second cross-linked polymer that is further crosslinked via a surface cross-linking agent
  • the superabsorbent resin comprises 10% or more of superabsorbent resin particles having an aspect ratio defined by a shortest diameter / longest diameter of each superabsorbent resin particle of less than 0.5,
  • the superabsorbent resin of the embodiment can be produced so that the base resin powder and the superabsorbent resin particles after the pulverization have a relatively small aspect ratio as the foam polymerization is carried out using a foaming agent or the like in the polymerization process, .
  • the proportion of the superabsorbent resin particles having an aspect ratio defined by the shortest diameter / longest diameter of the superabsorbent resin particles is 10% or more, or 10% to 60% or 10% to 50% As shown in FIG.
  • the superabsorbent resin of this embodiment has a higher Absorption rate and the like.
  • the superabsorbent resin of this embodiment can exhibit improved permeability and pressure absorbing ability as well as excellent absorption rate.
  • the improved liquid permeability and the like exhibited by the superabsorbent resin of this embodiment can be defined by the above range.
  • the superabsorbent resin of one embodiment can exhibit improved absorption rate and liquid permeability together with excellent basic absorption performance, It can be suitably applied to sanitary materials such as diapers having a thin thickness.
  • the superabsorbent resin of one embodiment will be described in more detail.
  • the "superabsorbent resin” referred to in the present specification refers to a base resin powder comprising a first crosslinked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; And a superabsorbent resin formed on the base resin powder, wherein the first crosslinked polymer comprises a surface crosslinked layer containing a second crosslinked polymer which is further crosslinked via a surface crosslinking agent.
  • the water-soluble ethylenically unsaturated monomer may be any monomer conventionally used in the production of a superabsorbent resin.
  • the water-soluble ethylenically unsaturated monomer may be a compound represented by the following Formula 1:
  • the monomer may be at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts of these acids.
  • acrylic acid or its salt is used as the water-soluble ethylenically unsaturated monomer, it is advantageous to obtain a highly water-absorbent resin having improved water absorption.
  • the monomers include maleic anhydride, fumaric acid, crotonic acid, itaconic acid, 2 - acryloylethanesulfonic acid, 2 - methacryloylethanesulfonic acid, 2-
  • (Meth) acryloylpropanesulfonic acid or an anionic monomer of 2- (meth) acrylamide-2-methylpropanesulfonic acid and its salt;
  • the water-soluble ethylenically unsaturated monomer may have an acidic group and at least a part of the acidic group may be neutralized.
  • the monomer is partially neutralized with an alkali substance such as sodium hydroxide, potassium hydroxide, ammonium hydroxide and the like Can be used.
  • the neutralization degree of the monomer may be 40 to 95 mol%, or 40 to 80 mol%, or 45 to 75 mol%.
  • the degree of neutralization may vary depending on the final properties. However, if the neutralization degree is too high, the neutralized monomer may precipitate and polymerization may not be smoothly proceeded. On the other hand, if the neutralization degree is too low, It can exhibit properties similar to elastic rubber which is difficult to handle.
  • the 'first crosslinked polymer' means that the water-soluble ethylenically unsaturated monomer described above is cross-linked in the presence of an internal crosslinking agent, and the 'base resin powder,' means a substance containing such a first crosslinked polymer.
  • the 'second crosslinked polymer' refers to a substance in which the first crosslinked polymer is additionally crosslinked via a surface crosslinking agent, and is thus formed on the base resin powder 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the surface cross-linking agent will be described later.
  • Such an implementation example super-absorbent resin it is, such a base resin powder and the super-absorbent resin particles according to the load of the base resin powder obtained by firing the polymerization as described above may be provided so as to have a relatively small aspect ratio.
  • the superabsorbent resin of one embodiment includes a plurality of superabsorbent resin particles, and the superabsorbent resin particles are defined, for example, by the shortest diameter / longest diameter of the superabsorbent resin particles on the basis of the total number of these superabsorbent resin particles 10% to 80%, or 10% to 70%, 10% to 60%, or 10% to 50% by number of the superabsorbent resin particles having an aspect ratio of less than 0.5 .
  • the aspect ratio of the base resin powder and the superabsorbent resin particles can be determined by analyzing each particle with an electron microscope, for example, as shown in Fig. 1, to calculate the shortest diameter (3) and the longest diameter , Whereby the aspect ratio of each base resin powder and the superabsorbent resin particles can be calculated. From the aspect ratio data of each particle thus calculated, the number ratio of particles having the aspect ratio of less than 0.5 can be calculated. For reference, it is confirmed that the aspect ratio of the base resin powder and the superabsorbent resin particles are equal to each other.
  • the superabsorbent resin of one embodiment contains particles having a small aspect ratio at a certain level or more, many fine pores can be formed between the base resin powder and the superabsorbent resin particles.
  • a surface cross-linked layer is formed on such porous particles, moisture can be absorbed at a high rate at a high rate between these micropores, so that the superabsorbent resin of one embodiment can exhibit a faster absorption rate and absorption performance have.
  • the superabsorbent resin of one embodiment described above is excellent in basic absorption under pressure or no pressure drop, absorption rate, and liquid permeability, Absorption can be defined by physical properties such as the absorption speed of 81, 30 seconds, or surface tension.
  • the superabsorbent resin of one embodiment has a centrifugal separation capacity (01 (:) of 30 to 30 minutes for physiological saline (0.9 weight% aqueous sodium chloride solution)
  • the centrifugal separation capability (1 (:) range defines the excellent zero pressure drop absorption performance exhibited by the superabsorbent resin in one embodiment 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the centrifugal separation performance (1 (:) of the physiological saline solution can be calculated by the following equation 1 after absorption of the superabsorbent resin into physiological saline over 30 minutes:
  • ⁇ 1 is the weight measured after dehydrating the nonwoven fabric bag with no high water-based resin at room temperature for 30 minutes in physiological saline solution for 30 minutes, then centrifuging at 250 (3 minutes for 3 minutes,
  • ⁇ ⁇ 2 (poe is a weight that is set after the impregnation and then in physiological saline for 30 minutes using a centrifuge dewatering 3 minutes at 250 (the third non-woven fabric bag into the superabsorbent polymer at room temperature.
  • the superabsorbent resin according to one embodiment has a pressure absorption capacity (positive) of 1 to 21 hours in physiological saline (0.9 weight% aqueous solution of sodium chloride) 21.5 to .
  • This pressure absorption capacity! 1 ) range can define the excellent pressure-absorbing performance exhibited by the superabsorbent resin of one embodiment.
  • ⁇ ⁇ () (is) is the initial weight (is) of godop water-based resin
  • ⁇ ⁇ 3 (is) is the sum total of unit weight that can weight the gorop water-based resin.
  • ⁇ 4 is the sum of the weight of the superabsorbent resin and the weight of the device capable of applying a load to the superabsorbent resin after absorbing the physiological saline solution into the superabsorbent resin for 1 hour under a load (0.7 to 81 ).
  • the superabsorbent resin of one embodiment has the centrifugal separation ability (01 (:) Absorbing ability (AUP)
  • the superabsorbent resin can have an absorbency of 46 to 63 g / g, as defined by the following formula 1, or 60 g / g of 47:
  • CRC represents centrifugal separation capacity for 30 minutes against physiological saline (0.9 weight% aqueous sodium chloride solution) of the above superabsorbent resin, and represents the maintenance performance calculated as the above-mentioned formula 1,
  • the AUP is the pressure absorption capacity for 0.7 hours under physiological saline (0.9 weight% sodium chloride aqueous solution) of the above superabsorbent resin at 0.7 psi for 1 hour,
  • the superabsorbent resin of one embodiment exhibits excellent absorption performance such as basic absorbability and pressure-absorptive / retaining ability under pressure, and can be suitably used for various sanitary materials.
  • the superabsorbent resin of one embodiment has a flow-inducibility (SFC, l (r 7 cm 3 s / g) of 30 (l (T 7 cm 3 _s / g) of physiological saline (aqueous solution of sodium chloride of 0.5 wt% ) can be less than, or 35 (10 7 cm 3 s / g) or more, or 40 to 150 (10 W s / g) , or 42 to 130 (. 1 (T 7 cm 3, s / g).
  • SFC, l (r 7 cm 3 s / g) of 30 (l (T 7 cm 3 _s / g) of physiological saline (aqueous solution of sodium chloride of 0.5 wt% ) can be less than, or 35 (10 7 cm 3 s / g) or more, or 40 to 150 (10 W s / g) , or 42 to 130 (. 1 (T 7 cm 3, s / g).
  • the physiological saline flow inducibility can be measured and calculated according to methods well known to those skilled in the art, for example, the methods disclosed in columns 54 to 59 of U.S. Patent No. 5562646.
  • the superabsorbent resin includes a base resin powder that maintains a high gel strength, and surface crosslinking proceeds under specific conditions therefor, so that the superabsorbent resin uniformly includes a surface crosslinked layer having excellent strength, , Thereby exhibiting improved physiological saline flow conductivity (SFC) and excellent liquid permeability.
  • SFC physiological saline flow conductivity
  • the superabsorbent resin of one embodiment is manufactured / provided using a surface cross-linking liquid or the like having a low surface tension described later, the surface tension of the superabsorbent resin is 60 to 75 mN / m or 60 to 73 mN / m.
  • This surface tension may, for example, a surface tension meter at 23 ° C costume on ⁇ 2 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the high surface tension of the water-absorbent resin may be a beam SAT, pressure absorption capacity, whole liquid as is that can evaluate the leakage of urine (1 to 1: ⁇ ) of the diaper including the gotop aqueous resin with properties that are separated scale.
  • the surface tension refers to the surface tension measured by swelling the superabsorbent resin in the brine, and when the surface tension of the superabsorbent resin is low, there is a high possibility that the urine leaks from the diaper or the like manufactured using the same.
  • the superabsorbent resin of one embodiment it is possible to produce a high-quality sanitary article by reducing the possibility of leaking by having an appropriate range of surface tension while maintaining high liquid permeability.
  • the surface tension of the superabsorbent resin is excessively low, a phenomenon of urine leakage, that is, rewet, may be increased.
  • the surface tension is excessively high, the surface crosslinked layer may be unevenly formed, have.
  • the superabsorbent resin of the above-mentioned one embodiment is swelled under 0.3 pressure condition by physiological saline inflowed through the mesh 1111 of the lower part of the cylindrical cylinder of about 0.16 ⁇ , / 111111, or 1.7111111 / 111 to 3.0111111 / 1111, or 1.801111 / 111111 to 2.6111111 / 111111.
  • Such a 30 second absorption rate can be obtained by changing the height variation of the rheometer upper plate with the volume expansion of the superabsorbent resin Can be measured and calculated as a value divided by the absorption time (30 seconds).
  • the superabsorbent resin exhibits a high gel strength and hence excellent liquid permeability , the particle distribution during the production process is controlled and the porous structure is formed therein. Therefore, the superabsorbent resin has an excellent absorption rate defined by the above- . Therefore, the superabsorbent resin can be preferably used in sanitary materials having a reduced content of fibrous material such as pulp.
  • the first crosslinked polymer contained in the base resin powder is selected from the group consisting of trimethylolpropane tri (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol di Acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butane diol di (meth) acrylate, butylene glycol di (meth) acrylate, diethylene glycol di 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • (Meth) acrylate triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipentaerythritol pentaacrylate, glycerin tri
  • a second internal crosslinking agent based on allyl (meth) acrylate the monomer may be a cross-linked polymer.
  • the superabsorbent resin of one embodiment can maintain a high gel strength even after proceeding with gel pulverization and pulverization, and accordingly, the liquid permeability and the pressure- Lt; / RTI >
  • the superabsorbent resin may include a cross-linked structure mediated by the above-mentioned plural kinds of surface cross-linking agents in the surface cross-linked layer.
  • the surface cross-linking solution containing the surface cross-linking agent and the liquid medium may further contain a surfactant, a predetermined polycarboxylic acid-based copolymer, a surfactant, or an aliphatic alcohol having 6 or more carbon atoms.
  • a surfactant a predetermined polycarboxylic acid-based copolymer, a surfactant, or an aliphatic alcohol having 6 or more carbon atoms.
  • the surface tension of the surface cross-linking liquid is achieved in a specific range relatively low by the use of the plural kinds of surface cross-linking agent and optionally the additional components contained in the surface cross-linking liquid, so that the high- Manufactured and supplied . have.
  • the superabsorbent resin of one embodiment described above may have a particle diameter of 150 to 850 II. More specifically, at least 95% by weight of the base resin powder and the superabsorbent resin including the base resin powder have a particle diameter of 150 to 850, and the fine powder having a particle diameter of less than 150_ may be less than 5% by weight. At this time, the particle size of the superabsorbent resin can be defined as the longest diameter of the superabsorbent resin particles already mentioned above.
  • the degree of foaming is increased by using a foaming agent or the like, 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • Such a preparation method comprises crosslinking a water-soluble ethylenically unsaturated monomer having at least partially neutralized acid groups in the presence of a blowing agent, a surfactant and an internal cross-linking agent to form a hydrogel polymer comprising a first cross-linking polymer;
  • a surface cross-linking agent comprising a surface cross-linking agent and a liquid medium and having a surface tension of 30 to 50 11/111 at a temperature of 20 to 25 ⁇ .
  • the manufacturing method of another embodiment includes forming a hydrogel polymer by cross-linking polymerization.
  • a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator in the presence of an internal cross- Or photopolymerization to form a hydrogel polymer.
  • the water-soluble ethylenically unsaturated monomer contained in the adduct monomer composition is as described above.
  • the monomer composition may include a polymerization initiator generally used in the production of a superabsorbent resin.
  • a polymerization initiator generally used in the production of a superabsorbent resin.
  • a thermal polymerization initiator or a photopolymerization initiator may be used depending on the polymerization method.
  • a certain amount of heat is generated by ultraviolet irradiation or the like, and a certain amount of heat is generated as the polymerization reaction, which is an exothermic reaction, proceeds, so that a thermal polymerization initiator can be further included.
  • photopolymerization initiator examples include benzoin ether, dialkyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyldimethyl Benzyl
  • acylphosphine Dimethyl Ketal, acyl phosphine, and alpha-aminoketone may be used.
  • acylphosphine a commercially available lucyrin TPO, i.e. 2,4,6-trimethyl-benzoyl-thiimethyl phosphine oxide, can be used. have.
  • a variety of photopolymerization initiators are disclosed in Reinhold Schwalm, UV Coatings: Basics, Recent Developments and New Application, Elsevier 2007, page 115, which is incorporated herein by reference.
  • the thermal polymerization initiator at least one compound selected from the group consisting of a persulfate-based initiator, an azo-based initiator, hydrogen peroxide, and ascorbic acid may be used.
  • a persulfate-based initiator sodium persulfate (Na 2 S 208), potassium persulfate (K 2 S 2 O 8), ammonium persulfate (NH 4) 2 S 208 ) , And the like.
  • azo (Azo) based initiators include 2,2-azo bis- (2-amidinopropane) dihydrochloride (2, 2-azobis (2 _ amidinopropane) dihydrochloride), 2, 2-azobis- (N, N-dimethylene isobutyramidine dihydrochloride, 2- (carbamoylazo) isobutylonitrile, 2,2-azobis- (N, N-dimethylene) isobutyramidine dihydrochloride, 2, 2-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride (2, 2 -azobis [2- (2 -imidazolin_ 2- yl) propane] dihydrochloride, and 4,4-azobis- (4-cyanovaleric acid). More thermal polymerization initiators are described in the Odian book, " Principle of Polymerization (Wiley, 1981), " page 203, which is incorporated herein by reference.
  • the polymerization initiator may be added at a concentration of about 0.001 to 1% by weight relative to the monomer composition. That is, when the concentration of the polymerization initiator is too low, the polymerization rate may become slow and the monomer remaining in the final product may be extracted in a large amount. Conversely, when the concentration of the polymerization initiator is excessively high, The physical properties of the resin may be deteriorated such that the content of the component for the water content becomes high and the pressure absorption ability becomes low, which is not preferable.
  • the monomer composition contains a crosslinking agent ("internal crosslinking agent ") for improving the physical properties of the resin by polymerization of the water-soluble ethylenically unsaturated monomer.
  • internal crosslinking agent &quot for improving the physical properties of the resin by polymerization of the water-soluble ethylenically unsaturated monomer.
  • Surface cross-linking agent &quot for improving the physical properties of the resin by polymerization of the water-soluble ethylenically unsaturated monomer.
  • the internal cross-linking agent than previously described two species for example, polyol poly (meth) acrylate-based first internal crosslinking agent, and allyl (meth) acrylate-based second with an internal cross-linking agent Can be used to obtain a hydrogel polymer.
  • the first internal crosslinking agent may be selected from the group consisting of trimethylol propane tri (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) (Meth) acrylate, propylene glycol di (meth) acrylate, butane diol di (meth) acrylate, butylene glycol di (meth) acrylate, diethylene glycol di (Meth) acrylates such as ethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipentaerythritol pentaacrylate, glycerin tri (meth) acrylate and pentaerythritol tetraacrylate At least one selected from the group consisting of Can be used, wherein the second internal cross-linking agent, allyl methacrylate or
  • the total content of the first and second internal crosslinking agents may be 0.01 to 2 parts by weight or 0.05 to 1.8 parts by weight based on 100 parts by weight of the monomer composition including the internal crosslinking agent and the monomer .
  • the first internal cross-linking agent and the second internal cross-linking agent may be used in a weight ratio of 1: 1 to 10: 1. In this way, while controlling the composition such as the kind and content range of the internal cross-linking agent, It is possible to more effectively obtain a superabsorbent resin that meets the physical properties of one embodiment. . However, if the content of the internal crosslinking agent is excessively large, the basic absorption performance of the superabsorbent resin may be deteriorated.
  • the above-mentioned monomer composition further includes a foaming agent.
  • a foaming agent In the presence of such a foaming agent, as the polymerization process proceeds to a foaming polymerization process, a large number of particles having a low aspect ratio can be formed, and base resin powder and superabsorbent resin particles having the above-mentioned particle distribution can be obtained.
  • the foaming agent foams during polymerization to form pores in the hydrogel polymer to form a large number of particles having a small aspect ratio and to increase the surface area.
  • the foaming agent include carbonates such as sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, calcium bicarbonate, calcium bicarbonate, Calcium carbonate, calcium bicarbonate, magnesium bicarbonate or magnesium carbonate can be used.
  • the blowing agent may be added at a concentration of about 0.01 to about 1.0 part by weight, or about 0.03 to about 0.7 part by weight, or about 0.05 to about 0.6 part by weight based on 100 parts by weight of the acrylic acid monomer.
  • the monomer composition may further include a foam stabilizer to optimize pore formation by the blowing agent.
  • a foam stabilizer serves to uniformly distribute bubbles in the entire region of the polymer while maintaining the shape of the bubbles formed by the foaming agent, thereby more effectively forming low aspect ratio particles and increasing the surface area of the polymer.
  • any component previously used as a foam stabilizer in the foaming polymerization of a superabsorbent resin may be used.
  • a cationic, anionic or nonionic surfactant may be used.
  • the bubble stabilizer may be added at a concentration of 0.001 part by weight to 0.1 part by weight based on 100 parts by weight of the carboxylic acid monomer.
  • the monomer composition may further contain additives such as a thickener, a plasticizer, a storage stabilizer, and an antioxidant, if necessary.
  • Such a monomer composition can be prepared in the form of a solution in which a raw material is dissolved in a solvent, such as the above-mentioned monomer, polymerization initiator, internal crosslinking agent, and the like.
  • usable solvents may be used without limitation of the constitution as long as they can dissolve the above-mentioned raw materials.
  • the solvent include water, ethanol, ethylene glycol, diethylene glycol, triethylene glycol, 1,4-butanediol, propylene glycol, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, Methyl ethyl ketone, acetone, methyl amyl ketone, cyclohexanone, cyclopentanone, diethylene glycol monomethyl ether, diethylene glycol ethyl ether, toluene, xylenes, butyrolactone, carbitol, methyl cellosolve acetate, Methyl acetamide, or a mixture thereof may be used.
  • the formation of the hydrogel polymer through polymerization of the monomer composition can be carried out by a conventional polymerization method, and the process is not particularly limited.
  • the polymerization method is divided into thermal polymerization and photopolymerization depending on the type of polymerization energy source.
  • the polymerization may proceed in a reactor having a stirring axis such as a kneader, And may proceed in a reactor equipped with a movable conveyor belt when it is advanced.
  • the hydrogel polymer may be obtained by charging the monomer composition into a reactor such as a kneader equipped with a stirring shaft, supplying hot air thereto, or heating the reactor by heating.
  • a reactor such as a kneader equipped with a stirring shaft
  • the hydrogel polymer discharged to the reactor outlet depending on the shape of the stirring shaft provided in the reactor can be obtained as particles of several millimeters to several centimeters.
  • the obtained hydrogel polymer can be obtained in various forms depending on the concentration and the injection rate of the monomer composition to be injected, and usually a gel polymer having a particle diameter of 2 to 50 mm (weight average) can be obtained.
  • a hydrogel polymer in the form of a sheet can be obtained.
  • the thickness of the sheet may vary depending on the concentration and the injection rate of the monomer composition to be injected. In general, the thickness of the sheet is adjusted to 0.5 to 10 cm in order to ensure uniform polymerization of the entire sheet, desirable.
  • the hydrogel polymer whose water content is controlled is gel-pulverized.
  • the pulverizer to be used is not limited in its constitution, but may be a vertical pulverizer, a turbo cutter, a turbo / grinder, a rotary pulverizer selected from the group of pulverizing machines consisting of a cutter mill, a cutter mill, a disc mill, a shred crusher, a crusher, a chopper and a disc cutter. , But it is not limited to the above example.
  • the gelation of the hydrogel polymer may be performed such that the diameter of the hydrogel polymer is from 0.01 mm to 50 mm, or from 0.01 mm to 30 mm. That is, in order to increase the drying efficiency, Be pulverized into particles 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the hydrogel polymer is gel-pulverized with 0.01 or more particles .
  • hydrogel polymer may stick to the surface of the gel pulverizer.
  • steam, water, surfactants, anti-aggregation agents for example, Etc
  • Persulfate-based initiators, azo initiators, hydrogen peroxide, thermal polymerization initiator, an epoxy-based crosslinking agent, a diol Example 01) class of cross-linking agent, two functional groups, or three cross-linking agent of the first functional group containing a crosslinking agent, a hydroxyl group which is a functional group or more acrylate functional groups Etc. may be added to the hydrogel polymer.
  • the hydrogel polymer can be dried.
  • the drying may be performed at a temperature of 120 to 250 ° C, preferably 140 to 200 ° C, more preferably 150 to 200 ° C.
  • the drying temperature may be defined as the temperature of the heating medium supplied for drying or the temperature inside the drying reactor including the heating medium and the polymer in the drying process.
  • the drying temperature is preferably 1201 or more. If the drying temperature is higher than necessary, the surface of the hydrogel polymer is excessively dried, And the physical properties of the final resin may be deteriorated. To prevent this, the drying temperature is preferably 2501 or less.
  • the drying time in the drying step is not particularly limited, but may be adjusted to 20 to 90 minutes at the drying temperature in consideration of process efficiency and physical properties of the resin.
  • the drying can be performed using a conventional medium, for example, by supplying hot air to the pulverized hydrogel polymer, infrared irradiation, microwave irradiation, ultraviolet irradiation, or the like.
  • drying is preferably performed so that the dried polymer has a water content of 0.1 to 10% by weight. That is, when the water content of the dried polymer is less than 0.1% by weight, the increase in the manufacturing cost due to excessive drying and the increase Degradation may occur, and when the water content of the dried polymer is more than 10% by weight, it is undesirable because the dried polymer adheres in the subsequent process and may interfere with the transport path.
  • the dry polymer can be pulverized, whereby the particle size and surface area of the polymer can be adjusted to an appropriate range.
  • the pulverization can be carried out such that the particle diameter of the pulverized polymer is from 150 to 850.
  • the particle diameter at this time can also be defined as the maximum diameter of each polymer particle and is also the same hereinafter.
  • Examples of the pulverizer that can be used in this case include a pin mill, a hammer mill, a screw mill, a roll mill, a disc mill, a jog mill, Can be used.
  • the step of selectively classifying particles having a particle diameter of 150 to 850 in the polymer particles obtained through the above-mentioned pulverization step may be further performed.
  • the base resin powder after the base resin powder is produced through the above-described classification step, the base resin powder can be cross-linked by surface heat treatment to form the superabsorbent resin particles in the presence of the surface cross-linking agent.
  • the surface cross-linking induces a cross-linking reaction on the surface of the base resin powder in the presence of a surface cross-linking agent.
  • a surface modifying layer surface cross-linking layer
  • a surface cross-linking liquid containing a surface cross-linking agent and a liquid medium and having a surface tension of 25 to 50 mN / m or 30 to 47 mN / m at a temperature of 20 to 25C The surface cross-linking can proceed.
  • the surface crosslinking liquid having a relatively low surface tension proceeds uniformly despite the relatively nonuniform particle shape (including a large number of particles having a low aspect ratio), and excellent crosslinking and strength
  • the surface cross-linking layer can be uniformly formed, and the pressure absorption ability, liquid permeability, etc. with respect to the absorption ability of the superabsorbent resin can be further improved.
  • the surface tension is excessively low, the retention of sanitary articles may increase, and when a surface cross-linking liquid having a high surface tension is used, the surface cross-linking layer is formed unevenly 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the physical properties such as the pressure absorption ability and the liquid permeability as compared with the absorption ability can be lowered.
  • the surface cross-linking agent and surface cross-linking solution including the liquid medium is optionally a surfactant, to the polycarboxylic acid-based copolymer or the carbon atoms having a repeating unit represented by the formula (I) and formula (I) 6 or more aliphatic alcohol, and the like.
  • a surfactant to the polycarboxylic acid-based copolymer or the carbon atoms having a repeating unit represented by the formula (I) and formula (I) 6 or more aliphatic alcohol, and the like.
  • II 2 and II 3 are each independently hydrogen or an alkyl group having 1 to 6 carbon atoms
  • 110 is an oxyalkylene group having 2 to 4 carbon atoms
  • M 1 is hydrogen or a monovalent metal or a nonmetal ion
  • -000 - an alkyloxy group having 1 to 5 carbon atoms or an alkyldioxy group having 1 to 5 carbon atoms
  • III is an integer of 1 to 100, 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • I) is an integer of 1 to 150, and when I) is 2 or more, two or more repeating units - 110 - may be the same or different from each other.
  • a plurality of alkylene carbonates having 2 to 6 carbon atoms may be used as the surface cross-linking agent. More suitable examples thereof include ethylene carbonate, propylene carbonate, butylene carbonate, trimethylene carbonate, glycerol carbonate .
  • the content of the surface cross-linking agent may be appropriately controlled according to the type of cross-linking agent, reaction conditions, etc., and preferably 0.001 to 5 parts by weight based on 100 parts by weight of the base resin powder. If the content of the surface cross-linking agent is too low, the surface modification may not be performed properly, and the physical properties of the final resin may be deteriorated. On the contrary, when an excessive amount of surface cross-linking agent is used, the basic absorption ability of the resin may be deteriorated due to excessive surface cross-linking reaction, which is not preferable.
  • the surface cross-linking solution may further contain a surfactant.
  • the type of the surface active agent is not particularly limited, and the surface of the liquid medium contained in the cross- Considering the kind and the like, a suitable nonionic surfactant, anionic surfactant or cationic surfactant can be selected and used. This makes it possible to further control the surface tension of the surface cross-linking liquid to the above-mentioned range.
  • the surface cross-linking solution may further comprise a polycarboxylic acid-based copolymer having the repeating unit represented by the formula (I-k) and the repeating unit represented by the formula (I-1).
  • a polycarboxylic acid-based copolymer having the repeating unit represented by the formula (I-k) and the repeating unit represented by the formula (I-1).
  • Such a polycarboxylic acid-based copolymer is known from JP-A-1684649, and its production method and the like are obvious to those skilled in the art.
  • the surface tension of the surface cross-linking solution may be added to the control by the above-mentioned range .
  • the liquid medium in the surface cross-linking liquid may further contain an aliphatic alcohol having 6 or more carbon atoms together with a polar solvent such as water or alcohol.
  • the aliphatic alcohols having 6 or more carbon atoms may be exemplified by C6-C20 primary, secondary, or tertiary alcohols, preferably C6-C16 primary alcohols. More preferably at least one selected from the group consisting of stearyl alcohol, lauryl alcohol, and cetyl alcohol may be used, but the present invention is not limited thereto.
  • the content of the aliphatic alcohol having 6 or more carbon atoms is about 0.001 to about 2 parts by weight, or about 0.01 to about 1 part by weight, preferably about 0.01 to about 1 part by weight, based on 100 parts by weight of the pulverized polymer, i.e., By weight, more preferably about 0.05 to about 0.8 part by weight may be used.
  • the surface cross-linking liquid may further contain, as a liquid medium, water and / or a hydrophilic organic solvent (for example, an alcohol-based polar organic solvent such as methanol) together with the components described above.
  • the content of water and the hydrophilic organic solvent is preferably in the range of 100 parts by weight to 100 parts by weight for the purpose of inducing even dispersion of the surface cross-linking liquid and preventing the aggregation of the base resin powder and optimizing the surface penetration depth of the surface cross- It can be applied by adjusting the addition ratio.
  • the method of adding the above-mentioned surface cross-linking solution to the base resin powder is not particular limitation.
  • surface cross-linking solution as a base resin powder were placed in the reaction tank mix and a method of surface cross-linking aekreul injection in the base resin powder, mixed and continuously supplied to a base resin powder and the surface cross-linking solution in the mixer being continuously operated at Method or the like can be used.
  • the surface cross-linking solution is 140 ° for the addition of a base resin powder C to 200 ° C, or 5 minutes to 60 minutes from the reaction up to a temperature of 170 ° C to 195 ° C, or 10 minutes to 50 minutes, or 20 minutes to
  • the surface cross-linking reaction can proceed for 45 minutes. More specifically, the surface cross-linking step is carried out by raising the temperature to the reaction maximum temperature over a period of at least 10 minutes at an initial temperature of 20 ° C to 130 ° C, or 40 ° C to 120 ° C, or 10 minutes to 30 minutes, And the heat treatment may be performed by maintaining the maximum temperature for 5 minutes to 60 minutes.
  • a superabsorbent resin suitably satisfying the physical properties of one embodiment can be produced more effectively.
  • the temperature raising means for the surface cross-linking reaction is not particularly limited.
  • a heating medium can be supplied, or a heating source can be directly supplied and heated.
  • the type of heat medium that can be used steam, hot air, hot fluid, or the like may be used, but the present invention is not limited thereto.
  • the temperature of the heat medium to be supplied may be determined by considering means of heating medium, So that it can be appropriately selected .
  • a heat source to be directly supplied there may be mentioned a heating method using electricity or a heating method using gas, but the present invention is not limited to the above example.
  • the superabsorbent resin obtained according to the above-described production method maintains excellent absorption performance such as water retention capacity and pressure absorption capacity, satisfies more improved liquid permeability and absorption rate, and can satisfy all the physical properties of one embodiment, It is possible to use suitably used raw materials, especially ultra-thin sanitary materials with reduced pulp content.
  • the superabsorbent resin according to the present invention can exhibit improved absorption rate and liquid permeability while maintaining excellent absorption performance, and can be preferably applied to sanitary materials such as diapers having a thinner thickness.
  • Fig. 1 is an electron micrograph showing an aspect ratio of the superabsorbent resin particles and a method for measuring the aspect ratio of the superabsorbent resin of the embodiment.
  • a continuous production apparatus comprising a polymerization process, a hydrogel pulverization process, a drying process, a pulverization process, a classification process, a surface cross-linking process, a cooling process, a classification process and a transportation process connecting each process was used .
  • a pulverizer (10 < (Having a perforated plate including a plurality of holes having a diameter of 1 ) and pulverized under respective conditions.
  • the hydrogel pulverized in the downstairs step 2 was dried in a drier capable of airflow transfer up and down.
  • a hot air of 180 psi was flown downward for 15 minutes so that the water content of the dried powder was about 2% or less , And flowed from above to downward for another 15 minutes to uniformly dry the hydrogel.
  • the resin dried in step 3 was pulverized by a pulverizer and classified to obtain a base resin having a size of 150 to 850 M M.
  • the base resin powder mixed with the surface cross-linking liquid was put into the surface cross-linking reactor and the surface cross-linking reaction was carried out.
  • the base resin powder It was confirmed that the temperature was gradually increased from the initial temperature in the vicinity, and after 30 minutes, the maximum reaction temperature of 1901: was reached. After reaching the maximum reaction temperature, additional reaction was carried out for 15 minutes, and a sample of the finally prepared superabsorbent resin was taken. After the surface cross-linking step, the particles were classified into standard ASTM standard mesh to obtain diameters of 150 to 850 Was prepared.
  • the base resin and the superabsorbent resin obtained by the above method were analyzed by electron micrograph (see Fig. 1, etc.), and the aspect ratio ( 3 / non-ratio) of each base resin powder and superabsorbent resin particle was calculated. As a result of the measurement, the ratio of particles having an aspect ratio of less than 0.5 among the base resin powder and the superabsorbent resin particles was confirmed to be about 10% by number.
  • Example 2
  • a superabsorbent resin of Example 2 was prepared in the same manner as in Example 1, except that 0.15 parts by weight of sodium hydrogencarbonate was used as a foaming agent.
  • the base resin / superabsorbent resin obtained in this manner was analyzed by electron microscope to determine the percentage (number%) of particles having an aspect ratio of less than 0.5 in all the base resin powder and superabsorbent resin particles. As a result of the measurement, it was confirmed that the particle ratio of the base resin powder and the superabsorbent resin particles having an aspect ratio of less than 0.5 was about 33% by number.
  • a superabsorbent resin of Example 3 was prepared in the same manner as in Example 1, except that 0.2 part by weight of sodium hydrogencarbonate was used as a foaming agent.
  • the base resin / superabsorbent resin obtained by this method was analyzed by electron microscope to determine the percentage (number%) of particles having an aspect ratio of less than 0.5 in all the base resin powder and superabsorbent resin particles.
  • the base resin powder and the high- Among the resin particles the proportion of particles having an aspect ratio of less than 0.5 was confirmed to be about 45% by number.
  • Example 4 The subsequent surface cross-linking step proceeded in the same manner as in Example 1 to prepare a high absorption constant of Example 3 having a particle diameter of from 150 to 850.
  • Example 4
  • the superabsorbent resin of Example 4 was prepared in the same manner as in Example 3 except that 0.02 g of polyoxyethylenesorbitan monopalmitate was added as a lubricant in the surface cross-linking liquid in Step 5.
  • Example 5
  • step 5 the aqueous resin of Example 5 was prepared in the same manner as in Example 3, except that 0.3 g of mono stearyl alcohol was added as a lubricant in the surface cross-linking solution.
  • Example 6
  • Example 7 The procedure of Example 1 was repeated except for adding 0.1 g of the polycarboxylic acid-based copolymer obtained in Synthesis Example 1 of Patent No. 1684649 as a lubricant in the surface cross-linking solution in Step 5, Resin.
  • Example 7 The procedure of Example 1 was repeated except for adding 0.1 g of the polycarboxylic acid-based copolymer obtained in Synthesis Example 1 of Patent No. 1684649 as a lubricant in the surface cross-linking solution in Step 5, Resin.
  • Example 7 The procedure of Example 1 was repeated except for adding 0.1 g of the polycarboxylic acid-based copolymer obtained in Synthesis Example 1 of Patent No. 1684649 as a lubricant in the surface cross-linking solution in Step 5, Resin.
  • Example 7 The procedure of Example 1 was repeated except for adding 0.1 g of the polycarboxylic acid-based copolymer obtained in Synthesis Example 1 of Patent No. 1684649 as a lubricant in the
  • a superabsorbent resin of Example 7 was prepared in the same manner as in Example 3, except that 1 g of trimethylene carbonate in 1 g of surface crosslinking solution and 1 g of propylene carbonate in 4 g of the compound in Step 5 were used, . Comparative Example 1
  • the base resin of Comparative Example 1 was prepared in the same manner as in Example 1, except that sodium hydrogencarbonate was not used as a foaming agent in Step 1. 2019/117482 1 »(: 1 ⁇ ⁇ 2018/013917
  • the base resin thus obtained was analyzed by electron microscope to determine the percentage (number%) of particles having an aspect ratio of less than 0.5 in all of the base resin powder. As a result of the measurement, it was confirmed that the proportion of particles having an aspect ratio of less than 0.5 in the base resin powder was about 5% by number. Comparative Example 2
  • Ethylene carbonate. 1 is a base resin powder 100 parts by weight of manufacture to prepare a super-absorbent resin of hagoneun Comparative Example 1 For comparison with the same 3 ⁇ 4-up 2, except for using a surface cross-linked liquid 5 for mixing into the water 4 ⁇ .
  • the surface tension of this surface cross-linking solution is 51 1! / 111. & Lt; / RTI & gt ; Comparative Example 3
  • the centrifugal separation performance was measured according to EDANA WSP 241.3 of the European Disposables and Nonwovens Association (EDANA) standard.
  • the superabsorbent resin W 0 ( g, about 0.2 g) And sealed in a bag made of polyethylene terephthalate and then immersed in physiological saline solution of 0.9 wt% aqueous solution of sodium chloride at room temperature. After 30 minutes, the envelope was centrifuged and the water was drained at 250G for 3 minutes, after which the mass of the envelope, W 2 ( g), was determined. In addition, after the same operation was performed without using a high viscosity aqueous resin, the mass at that time was measured. Using each of the masses thus obtained, CRC (g / g) was calculated according to the following equation (1) to confirm the maintenance performance.
  • Absorbency under pressure was immediately applied to the superabsorbent resins of Examples and Comparative Examples according to the method of European Disposables and Nonwovens Association standard EDANA WSP 242.3.
  • a 400 mesh wire mesh made of stainless steel was attached to the bottom of a plastic cylinder having an inner diameter of 60 mm.
  • the resin W 0 ( g, 0.90 g) obtained in Examples 1 to 6 and Comparative Examples 1 to 4 was uniformly sprayed on a iron mesh under the conditions of a temperature of 23 ⁇ 2 ° C and a relative humidity of 45%
  • the piston which can uniformly apply a load of 4.83 kPa (0.7 psi) on it, is slightly smaller than the outer diameter of 60 mm, so there is no gap between the inner wall of the cylinder and the up and down movement is not disturbed.
  • the weight W 3 ( g) of the device was measured.
  • a glass filter having a diameter of 125 mm and a thickness of 5 mm was placed inside a Petro dish having a diameter of 150 mm, and physiological saline composed of 0.90% by weight sodium chloride was made to have the same level as the upper surface of the glass filter.
  • the above measuring apparatus was put on a glass filter, and the liquid was absorbed under a load for 1 hour. After one hour, the measuring device was lifted and its weight w 4 ( g) immediately.
  • W 0 ( g) is the initial weight (g) of the water absorbent resin
  • W 3 ( g) is the sum of the weight of the top water-based resin and the weight of the device capable of applying a load to the high-water-
  • W 4 ( g) is the incorporation of the weight of the superabsorbent resin and the weight of the device capable of imparting a load to the superabsorbent resin after absorbing physiological saline into the superabsorbent resin for one hour under a load of 0.7 psi.
  • the 30 second absorption rate and porosity can be measured by swelling about 0.16 g of superabsorbent resin under physiological saline infused through the mesh under the cylindrical cylinder under 0.3 psi pressure. Measuring the height change of the rheometer top plate with the volume expansion of the superabsorbent resin in real time and instantaneously accelerating and decelerating the 30 second damping rate through the value of the top plate height at 30 seconds divided by the number of top times (30 seconds) Can be calculated.
  • the porosity is calculated by calculating the total volume (final absorption height * the area under the cylindrical cylinder) inside the cylinder when swelling of the superabsorbent resin is completed, and subtracting the physiological saline absorption of the superabsorbent resin measured by the water content meter from this value .
  • the surface tension of the surface cross-linking liquid was measured using a surface tension meter Kruss Kl / KlOO, in which the surface cross-linking liquid was pipetted and transferred to another clean cup.
  • the surface tension of the superabsorbent resin was adjusted to 150 g of physiological saline consisting of 0.9 wt% sodium chloride in a 250 mL beaker, followed by magnetic bar stirring. 1.0 g of the superabsorbent resin was added to the stirring solution and stirred for 3 minutes. Stirring was stopped, and the swollen superabsorbent resin was allowed to stand on the bottom for at least 15 minutes.
  • Examples 1 to 7 was found to have excellent tube-component refers to that meeting the predetermined particle size distribution, and defined as 35 (_10_ 7 11 3 3 / above.
  • the Examples 1 to 7 are absorbed It was confirmed that not only the basic absorption performance defined by the degree of penetration, but also the liquid permeability, the particle distribution was optimized, and the absorption rate defined by the 30 second absorption rate was also excellent.

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Abstract

La présente invention concerne une résine hautement absorbante qui non seulement présente d'excellentes capacités d'absorption de base, mais qui présente également une vitesse d'absorption et une perméabilité aux liquides encore améliorées et analogues ; et un procédé pour sa production. La résine hautement absorbante comprend : une poudre de résine de base comprenant un polymère réticulé de monomères insaturés à base d'éthylène aqueux qui comprennent des groupes acides, dont au moins une partie est neutralisée ; et une couche réticulée de surface qui est formée sur la poudre de résine de base et obtenue par réticulation supplémentaire de la poudre de résine de base par l'intermédiaire d'un agent de réticulation de surface, la résine hautement absorbante comprenant, en nombres ronds, au moins 10 % de particules de résine hautement absorbantes présentant un rapport d'aspect, défini comme le plus petit diamètre/le plus grand diamètre de chacune des particules de résine hautement absorbantes, inférieur à 0,5 et la conductivité de solution saline (SFC) satisfait à une certaine plage.
PCT/KR2018/013917 2017-12-15 2018-11-14 Résine hautement absorbante et procédé pour sa production Ceased WO2019117482A1 (fr)

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JP2019536818A JP7433047B2 (ja) 2017-12-15 2018-11-14 高吸水性樹脂およびその製造方法
CN201880005698.2A CN110167997B (zh) 2017-12-15 2018-11-14 超吸收性聚合物及其制备方法
BR112019014971-6A BR112019014971B1 (pt) 2017-12-15 2018-11-14 Polímero superabsorvente e método para preparar o mesmo
EP18884837.8A EP3540001B1 (fr) 2017-12-15 2018-11-14 Résine hautement absorbante et procédé pour sa production
US16/475,940 US11406963B2 (en) 2017-12-15 2018-11-14 Superabsorbent polymer and preparation method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022517074A (ja) * 2019-09-30 2022-03-04 エルジー・ケム・リミテッド 高吸水性樹脂組成物およびその製造方法
JP7258401B2 (ja) 2019-09-30 2023-04-17 エルジー・ケム・リミテッド 高吸水性樹脂組成物およびその製造方法

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