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WO2020245690A1 - Composition adhésive d'acrylate à base d'eau - Google Patents

Composition adhésive d'acrylate à base d'eau Download PDF

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Publication number
WO2020245690A1
WO2020245690A1 PCT/IB2020/054845 IB2020054845W WO2020245690A1 WO 2020245690 A1 WO2020245690 A1 WO 2020245690A1 IB 2020054845 W IB2020054845 W IB 2020054845W WO 2020245690 A1 WO2020245690 A1 WO 2020245690A1
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Prior art keywords
water
polyacrylate
adhesive composition
emulsion
acrylate adhesive
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Ceased
Application number
PCT/IB2020/054845
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English (en)
Inventor
Shupeng WU
Lili QIE
Xiaohai SHENG
Weina WANG
Jun Nie
Xuemei Pan
Heng Liu
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3M Innovative Properties Co
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3M Innovative Properties Co
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Publication of WO2020245690A1 publication Critical patent/WO2020245690A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/064—Copolymers with monomers not covered by C09J133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
    • 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
    • C08F220/00—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
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic

Definitions

  • the present invention relates to the field of instant adhesives, and in particular to a water-based acrylate adhesive composition.
  • Instant adhesives are ones having adequate wet adhesion. A strong bond is quickly developed before the adhesive composition is completely dried.
  • Common types of instant adhesives include solvent-based instant adhesives and water-based instant adhesives. Solvent-based instant adhesives contain a great amount of highly volatile organic solvents, and are gradually exiting the market due to the increasingly stringent environmental regulations. Water-based instant adhesives has thus increased in market share because they are environmentally friendly.
  • chloroprene rubber adhesives At present, the most common water-based instant adhesive product is chloroprene rubber adhesives. Chloroprene rubber has fast-bonding performance because of its low glass transition temperature (about -45 °C) and it has room -temperature crystallization performance (about 35°C). However, because of the high crystallization temperature, the fast-bonding performance of Chloroprene rubber will decrease significantly when the ambient temperature is slightly lower (e.g. ⁇ 10°C). In addition, because chloroprene latex contains chlorine, it is not an environmentally friendly material. The environmental friendliness of Chloroprene rubber thus decreases to a certain extent.
  • Another type of developing water-based instant adhesive product is two-component adhesives, which contains an emulsion and a demulsifier (such as an inorganic salt solution).
  • a demulsifier such as an inorganic salt solution.
  • the emulsion is mixed with the demulsifier to demulsify the emulsion so as to achieve fast bonding performance.
  • Two-component adhesives have a relatively complex application procedures and are harder to control.
  • the present invention provides a water-based acrylate adhesive composition, comprising:
  • polyacrylate the polyacrylate being formed by copolymerization of raw materials containing at least two polymerizable monomers, the polyacrylate having a glass transition temperature within a range of -40°C and 15°C, and a number-average molecular weight within a range of 30,000 and
  • the pH value of the water-based acrylate adhesive composition is below 6.
  • a weight ratio of the cosolvent to the polyacrylate is within a range of 0.1 : 100 and 15: 100.
  • the weight ratio of the cosolvent to the polyacrylate is within a range of 5 : 100 and 10: 100.
  • the amount of the polyacrylate is 40 to 80 parts by weight
  • the amount of the emulsifier is 0.5 to 2 parts by weight
  • the amount of the water is 20 to 60 parts by weight.
  • polymerizable monomers for the polyacrylate comprise methacrylic acid, acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, isobutyl acrylate, isobutyl methacrylate, isobutyl methacrylate, 2-ethylhexyl acrylate, or a combination thereof.
  • polymerizable monomers for the polyacrylate comprise styrene, ethylene acetate, or a combination thereof.
  • the cosolvent is selected from the group consisting of cyclohexane, n-heptane, ethyl acetate, n-butyl acetate, isobutyl acetate, n-hexyl acetate and a combination thereof.
  • the glass transition temperature of the polyacrylate is above -30°C, preferably above -20°C.
  • the glass transition temperature of the polyacrylate is below 10°C.
  • the pH value of the water-based acrylate adhesive composition is below 5, preferably below 4.5.
  • the present invention provides a water-based acrylate adhesive composition that has excellent room -temperature fast-bonding performance.
  • the water-based acrylate adhesive composition provided by the present invention comprises: polyacrylate, the polyacrylate having a glass transition temperature within a range of -40°C and 15°C, and a number-average molecular weight within a range of 30,000 and 120,000;
  • the pH value of the water-based acrylate adhesive composition is below 6.
  • the adhesive composition provided by the present invention is based on polyacrylate rather than chloroprene rubber.
  • Polyacrylate is more environmentally friendly than chloroprene rubber.
  • the adhesive composition provided by the present invention is water-based, which does not contain a high amount of volatile solvents, thereby improving the environmental friendliness of the adhesive composition as compared with that of solvent-based fast-bonding adhesive compositions.
  • polyacrylate refers to a polymer which is mainly polymerized by (meth)acrylic acid and (meth)acrylate monomers.
  • the monomers may be acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, isobutyl acrylate, isobutyl methacrylate, isobutyl methacrylate, 2-ethylhexyl acrylate, etc. More preferably, the monomers are methacrylic acid, acrylic acid, 2-ethylhexyl acrylate, and a combination thereof.
  • (meth)acrylic acid and (meth)acrylate monomers may also be added.
  • styrene or vinyl acetate monomers may be added. These monomers can adjust the glass transition temperature and hydrophilicity of the obtained polymers.
  • Acrylamide monomers such as methacrylamide and acryloyl morpholine may also be used.
  • the composition comprises an emulsifier.
  • Emulsifiers that can be used are non- cationic emulsifiers (i.e., anionic emulsifiers and non-ionic emulsifiers or a combination thereof), such as DS-10 (alkylbenzene sulfonate, purchased from Rhodia), SR- 10 (Reactive nonylphenol free type anionic emulsifier purchased from ADEKA), SR-20 (Reactive nonylphenol free type anionic emulsifier purchased from ADEKA), ER-10 (Reactive nonylphenol free type anionic emulsifier purchased from ADEKA), ER-20 (Reactive nonylphenol free type anionic emulsifier, purchased from ADEKA), FES- 32 (Aliphatic alcohol ether sulfate, purchased from BASF), OP- 10 (Polyoxyethylene octylsifiers and a combination thereof), such as DS-10 (alkylbenzene sulfon
  • the adhesive composition will lost its fast bonding property when employing a cationic emulsifier.
  • the inventor of the invention discovered that when a proper amount of cosolvent was added to the composition, the emulsion composition has excellent fast-bonding performance.
  • the cosolvent in the present invention is a solvent with good compatibility with polyacrylate; that is, the solubility of the polymer and the solubility of the solvent are similar. That the solubility of the polymer and the solubility of the solvent being similar refers to that the difference between the solubility parameter of the solvent and that of the polymers is not greater than 1.5.
  • the solubility parameter of the obtained emulsion polymer is 9.30, so the solubility parameter of the selected cosolvent should be about 9.30, such as cyclohexane (8.59), isobutyl acetate (9.10), and hexyl acetate (9.15).
  • the added cosolvent may be well dispersed in polymer emulsion particles and serves as a plasticizer, so that the adhesive composition has excellent fast-bonding performance.
  • Cosolvents that can be used include cyclohexane, n-heptane, ethyl acetate, n-butyl acetate, isobutyl acetate, n-hexyl acetate, etc.
  • the amount of the used cosolvent is preferably in a range of 0.1- 15%, i.e., the weight ratio of the cosolvent to the polyacrylate is 0.1: 100-15: 100. More preferably, the weight ratio is within a range of 5% and 10%.
  • the glass transition temperature Tg of the polyacrylate is specifically selected to be within a range of -40°C and 15°C. In a non-theoretical sense, it is considered that when the glass transition temperature is too high, the fast-bonding performance is poor; and when the glass transition temperature is too low, the final strength is insufficient. Further, the glass transition temperature of the polyacrylate is preferably above -30°C, more preferably above -20°C. The glass transition temperature of the polyacrylate is preferably below 10°C. When the glass transition temperature is within the preferred range, the composition exhibits better fast-bonding performance at low temperature.
  • the number-average molecular weight of the polyacrylate is selected to be within a range of 30,000 and 120,000. In a non-theoretical sense, it is considered that, when the number- average molecular weight is too high, the fast-bonding performance is poor; and when the number- average molecular weight is too low, the final strength is insufficient.
  • the pH value of the emulsion As discovered by the inventor, when the pH value is too high, specifically for example higher than 6, the emulsion composition loses fast-bonding performance.
  • the pH value of the emulsion may be tested by pH meter. When the pH value of the emulsion is below 5, more preferably below 4.5, the fast-bonding performance of the emulsion composition is further improved.
  • the weight proportions of the polyacrylate, water and emulsifier may be selected appropriately.
  • the amount of the polyacrylate is 40 to 80 parts by weight
  • the amount of the emulsifier is 0.5 to 2 parts by weight
  • the amount of the water is 20 to 60 parts by weight.
  • the emulsion obtained accordingly has suitable fluidity and viscosity, and thus ensuring the fast-bonding performance.
  • 2-EHA denotes 2-ethylhexyl acrylate
  • MAA denotes methacrylic acid
  • AA denotes acrylic acid
  • VAc vinyl acetate
  • ST denotes styrene
  • IOTG denotes isooctyl thioglycolate
  • KPS denotes potassium persulfate
  • TBHP denotes tetrabutyl diphosphate.
  • the commodities mentioned in the examples and comparative examples include SIPONATE DS- 10, which is an emulsifier purchased from RHODIA; ER-20, which is an emulsifier purchased from ADEKA CHEMICAL; and T1651, which is a reducing agent purchased from BRIJGGEMANN CHEMICAL.
  • the glass transition temperature of the poly acrylate obtained through polymerization is measured by adopting a DSC thermal analysis method.
  • the pH value of the obtained emulsion is measured by adopting a pH meter.
  • a piece of 10 cm c 10 cm c 5 cm cuboid thick PU foam sheet (polyurethane, with density of 19 kg/m 3 ) and a piece of 10 cm c 10 cm c 1.5 cm cuboid thin PU foam sheet (with density of 19 kg/m 3 ) are used for performing a 90-degree bonding test to evaluate the fast-bonding performance.
  • Five grams of the adhesive composition to be tested are sprayed evenly on two adjacent surfaces of the thick PU foam sheet (10 cm c 1.5 cm surface and 10 cm c 10 cm surface).
  • the thin PU foam sheet is immediately bent for 90 degrees and then attached to the two surfaces of the thick PU foam sheet just sprayed with adhesive, and the thin PU foam sheet is then pressed with just the right force for fitting.
  • the hand After a period of time, the hand lets go of the PU foam sheet. If the PU foam sheets seperate, the hand continue to press on the PU foam sheet until the thin PU foam sheet does not seperate with the thick PU foam sheet, and the time needed to complete the bonding is recorded. After that, the bonded foam is let stand, and the duration to the time at which the thin PU foam sheet is warped from the thick PU foam sheet is recorded. If no warping occurs within 24h, it is evaluated as "non-debonded".
  • the temperature was set to 60°C at the end of polymerization, then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped, the dropping was completed after lh, the temperature was decreased to room temperature, cyclohexane (6.87 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • NH3 ⁇ 2O was added to the emulsion obtained in example 1 to regulate the pH value to 3.52.
  • the glass transition temperature, the number-average molecular weight and the polymer dispersion index of the polyacrylate, and the fast-bonding performance of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • NH3 ⁇ 2O was added to the emulsion obtained in example 1 to regulate the pH value to 5.02.
  • the glass transition temperature, the number-average molecular weight and the polymer dispersion index of the polyacrylate, and the fast-bonding performance of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60° C at the end of polymerization, then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped, the dropping was completed after lh, the temperature was decreased to room temperature, cyclohexane (6.87 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60°C at the end of polymerization, then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped, the dropping was completed after lh, the temperature was decreased to room temperature, cyclohexane (6.87 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the pH value of the obtained emulsion was 3.42.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60° C at the end of polymerization, then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped, the dropping was completed after lh, the temperature was decreased to room temperature, cyclohexane (6.87 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60° C at the end of polymerization, then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped, the dropping was completed after lh, the temperature was decreased to room temperature, cyclohexane (6.87 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the polymerization of the emulsion was the same as that in example 1, the difference only lied in that, after polymerization was finished and the temperature was decreased to room temperature, cyclohexane (13.74 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the polymerization of the emulsion was the same as that in example 1, the difference only lied in that, after polymerization was finished and the temperature was decreased to room temperature, hexyl acetate (13.74 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the polymerization of the emulsion was the same as that in example 1, the difference only lied in that, after polymerization was finished and the temperature was decreased to room temperature, isobutyl acetate (13.74 g) was added, stirring was performed for half an hour, and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • An anionic emulsifier SIPONATE DS-10 (1.37 g) was added to deionized water (160.67 g); stirring was performed in a five-neck bottle containing a reflux condenser, a thermometer, a stirrer and a feeding pump; after the emulsifier was completely dissolved, a mixture of 2-EHA (68.7 g), MA (16.44 g), AA (4.12 g), ST (41.22 g), VAc (6.85 g) and IOTG (0.27 g) was added, nitrogen was fed into reaction solution to remove oxygen; stirring was performed for emulsification for 20 min; then the temperature was increased to 45°C; then KPS (0.27 g), Na S O (0.07 g) and 0.22% ferrous sulfate heptahydrate aqueous solution (0.6 g) were sequentially added to initiate polymerization; the reaction solution was stirred to emit heat for 30 min; the temperature was set to 70°C; and polymer
  • the temperature was set to 60°C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • An anionic emulsifier SIPONATE DS-10 (1.37 g) was added to deionized water (160.67 g); stirring was performed in a five-neck bottle containing a reflux condenser, a thermometer, a stirrer and a feeding pump; after the emulsifier was completely dissolved, a mixture of 2-EHA (79.46 g), MA (16.44 g), AA (6.85 g), ST (27.4 g), VAc (6.85 g) and IOTG (0.14 g) was added; nitrogen was fed into reaction solution to remove oxygen; stirring was performed for emulsification for 20 min; then the temperature was increased to 45°C; then KPS (0.27 g), Na S O (0.07 g) and 0.22% ferrous sulfate heptahydrate aqueous solution (0.6 g) were sequentially added to initiate polymerization; the reaction solution was stirred to emit heat for 30 min; the temperature was set to 70°C; and polymer
  • the temperature was set to 60°C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • An anionic emulsifier SIPONATE DS-10 (1.37 g) was added to deionized water (160.67 g); stirring was performed in a five-neck bottle containing a reflux condenser, a thermometer, a stirrer and a feeding pump; after the emulsifier was completely dissolved, a mixture of 2-EHA (79.46 g), MA (16.44 g), AA (6.85 g), ST (27.4 g), VAc (6.85 g) and IOTG (0.54 g) was added; nitrogen was fed into reaction solution to remove oxygen; stirring was performed for emulsification for 20 min; then the temperature was increased to 45°C; then KPS (0.27 g), Na 2 S 2 0 > (0.07 g) and 0.22% ferrous sulfate heptahydrate aqueous solution (0.6 g) were sequentially added to initiate polymerization; the reaction solution was stirred to emit heat for 30 min; the temperature was set to 70°C
  • the temperature was set to 60°C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, and the fast-bonding performance of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60°C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; cyclohexane (6.87 g) was added; stirring was performed for half an hour; and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60° C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; cyclohexane (6.87 g) was added; stirring was performed for half an hour; and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • the temperature was set to 60° C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; cyclohexane (6.87 g) was added; stirring was performed for half an hour; and filtration was performed to obtain an emulsion.
  • the glass transition temperature, the number-average molecular weight, the polymer dispersion index of the polyacrylate, the fast-bonding performance of the emulsion, and the pH value of the emulsion were measured according to the above methods. The results were as shown in Table 1.
  • An anionic emulsifier SIPONATETM DS-10 (1.37 g), ER-20 (0.27 g) and NaaHPCE (0.27 g) were added to deionized water (160.67 g); stirring was performed in a five-neck botle containing a reflux condenser, a thermometer, a stirrer and a feeding pump; after the emulsifier was completely dissolved, a mixture of 2-EHA (93.16 g), MA (16.44 g), AA (6.85 g), ST (13.70 g), VAc (6.85 g) and IOTG (0.27 g) was added; nitrogen was fed into reaction solution to remove oxygen; stirring was performed for emulsification for 20 min; then the temperature was increased to 45°C; then KPS (0.27 g), Na 2 S 2 0 > (0.07 g) and 0.22% ferrous sulfate heptahydrate aqueous solution (0.6 g) were sequentially added to initiate polymerization
  • the temperature was set to 60° C at the end of polymerization; then 10% TBHP aqueous solution (1.58 g) and 10% T1651 aqueous solution (1.32 g) were dropped; the dropping was completed after lh; the temperature was decreased to room temperature; cyclohexane (6.87 g) was added; stirring was performed for half an hour; and filtration was performed to obtain an emulsion.
  • Table 1 shows that the various parameters of the water-based emulsion compositions in Examples 1-10 meet the requirements of the present invention.
  • the bonding can be finished within 5s; debonding does not occur within 24h. It can be seen that the composition can form bonds fast.
  • the emulsion in comparative examples 1-3 do not contain any cosolvent, the emulsion fails to create a bond, or debonding occurs very quickly after bonding.
  • the pH value of the emulsion in comparative example 4 is higher than pH 6; the number-average molecular weight of the polyacrylate in comparative example 5 is greater than 120,000; the number-average molecular weight of the polyacrylate in comparative example 6 is less than 30,000; the glass transition temperature of the polyacrylate in comparative example 7 is above 15°C; and the glass transition temperature of the polyacrylate in comparative example 8 is below -40°C.
  • the emulsions in these comparative examples have poor fast bonding performance.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Polymerisation Methods In General (AREA)

Abstract

La présente invention concerne une composition adhésive d'acrylate à base d'eau, qui comprend : du polyacrylate, le polyacrylate ayant une température de transition vitreuse dans une plage de -40 °C et 15 °C, et une masse moléculaire moyenne en nombre dans une plage de 30 000 et 120 000 ; un cosolvant ; un émulsifiant ; et de l'eau, la composition adhésive d'acrylate à base d'eau ayant une valeur de pH inférieure à 6. La composition adhésive d'acrylate à base d'eau selon la présente invention est hautement respectueuse de l'environnement et présente d'excellentes performances de liaison rapide.
PCT/IB2020/054845 2019-06-03 2020-05-21 Composition adhésive d'acrylate à base d'eau Ceased WO2020245690A1 (fr)

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CN201910479543.9A CN112029448B (zh) 2019-06-03 2019-06-03 水性丙烯酸酯系胶粘剂组合物
CN201910479543.9 2019-06-03

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