WO2018173702A1 - 吸湿性粒状綿および該粒状綿を含有する中綿 - Google Patents
吸湿性粒状綿および該粒状綿を含有する中綿 Download PDFInfo
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- WO2018173702A1 WO2018173702A1 PCT/JP2018/008103 JP2018008103W WO2018173702A1 WO 2018173702 A1 WO2018173702 A1 WO 2018173702A1 JP 2018008103 W JP2018008103 W JP 2018008103W WO 2018173702 A1 WO2018173702 A1 WO 2018173702A1
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- WIPO (PCT)
- Prior art keywords
- hygroscopic
- fiber
- granular cotton
- fibers
- granulated wool
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Classifications
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/02—Cotton wool; Wadding
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/02—Layered materials
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/12—Hygroscopic; Water retaining
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47G—HOUSEHOLD OR TABLE EQUIPMENT
- A47G9/00—Bed-covers; Counterpanes; Travelling rugs; Sleeping rugs; Sleeping bags; Pillows
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
- D04H1/06—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres by treatment to produce shrinking, swelling, crimping or curling of fibres
- D04H1/073—Acrylonitrile series
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/43—Acrylonitrile series
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/58—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides
- D06M11/63—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides with hydroxylamine or hydrazine
Definitions
- the present invention relates to a hygroscopic granular cotton having both hygroscopicity and sustained bulkiness, and a batting containing the granular cotton.
- Patent Document 1 Conventionally, it has been proposed to use moisture-absorbing / releasing fibers for clothing and bedding (Patent Document 1).
- the batting using moisture-absorbing / releasing fibers is expected to have functions such as humidity control by moisture-absorbing / releasing properties and heat retention using heat generated by moisture absorption.
- moisture-absorbing / releasing fibers have low bulkiness and resilience, and are a major issue in developing into batting.
- Patent Document 2 discloses a technique for improving bulkiness by modifying a moisture absorbing / releasing fiber. Moreover, in patent document 3, the technique which improves bulkiness by raising the crimp of a moisture absorption / release fiber is disclosed. Furthermore, Patent Document 4 discloses a technique for improving the bulkiness by making hygroscopic fibers granular with other synthetic fibers and collecting a large number of these.
- the present invention was created in view of the current state of the prior art, and its object is to provide a hygroscopic granular cotton having both hygroscopicity and sustained bulkiness, and a filling containing the granular cotton. It is in.
- the present inventors have reduced the number of fluff protruding from the surface of the granular cotton, and when the granular cotton is pressed against each other by moisture absorption, pressure, deformation, etc. It has been found that the entanglement between the granular cottons can be suppressed and the bulk can be easily recovered.
- a granular cotton containing hygroscopic fibers composed of a surface layer portion made of a polymer having a crosslinked structure and a carboxyl group and a central portion made of an acrylonitrile-based polymer, and having a volume expansion coefficient by the following measuring method.
- a hygroscopic granular cotton having a moisture absorption rate of 4% or more in an environment of 15% or more and 20 ° C. and a relative humidity of 65%.
- ⁇ Measurement method> A sample that has been conditioned for at least 24 hours in a constant temperature and humidity machine at 20 ° C.
- the hygroscopic granular cotton of the present invention has both hygroscopicity and sustained bulkiness. More specifically, since it has better moisture absorption and release performance than general polyester as a batting, it is difficult to stuffy, and it is difficult to pass even if it is continuously used, and it can maintain bulkiness.
- the hygroscopic granular cotton of the present invention having such performance is useful as a batting, and particularly for applications that come into contact with or close to the human body, such as batting for duvets, batting such as cushions and chairs, or ski wear, winter clothes, coats, It can be suitably used for clothing items such as jumpers, gloves and semi-wraps.
- the present invention is described in detail below.
- the hygroscopic granular cotton of the present invention has a volume expansion coefficient of 15% or more, more preferably 20% or more, still more preferably 25% or more by the method described later.
- Such a granular cotton having a volume expansion rate of less than 15% is too hard and has a rough texture, or the bulkiness is greatly reduced during repeated use. Problems such as a significant decrease in heat retention or a collapse of the shape occur.
- limiting in particular as an upper limit of a volume expansion coefficient It seems that it is difficult to produce hygroscopic granular cotton which exceeds 100% in this invention.
- the hygroscopic granular cotton of the present invention has a 20 ° C. ⁇ 65% RH hygroscopicity of 4% or more, more preferably 5% or more, and further preferably 6% or more.
- the moisture absorption rate is less than 4%, the moisture absorption performance is insufficient, and when used in an application that comes into contact with or close to the human body, the water vapor emitted from the human body cannot be sufficiently absorbed, resulting in a strong stuffiness. If it becomes severe, water vapor may condense, causing stickiness and cold sweat.
- the hygroscopic granular cotton of the present invention contains hygroscopic fibers composed of a surface layer portion made of a polymer having a crosslinked structure and a carboxyl group and a central portion made of an acrylonitrile-based polymer.
- hygroscopic fibers composed of a surface layer portion made of a polymer having a crosslinked structure and a carboxyl group and a central portion made of an acrylonitrile-based polymer.
- moisture absorption / release performance is exhibited in the surface layer portion, and a certain level of fiber hardness (hardness) is maintained in the central portion.
- the central part is made of a polymer having a crosslinked structure and a carboxyl group as in the case of the surface layer part, the fiber is very easy to pass and it is difficult to maintain bulkiness.
- the proportion of the hygroscopic fibers contained in the hygroscopic granular cotton is preferably 10 to 70% by mass, more preferably 15 to 40% by mass, and further preferably 20 to 35% by mass. If it is less than 10% by mass, the moisture absorption / release performance of the hygroscopic granular cotton may be insufficient. If it exceeds 70% by mass, the bulkiness and sustainability of the hygroscopic granular cotton may be insufficient.
- fibers used in addition to the hygroscopic fibers include polyester fibers, polypropylene fibers, polyethylene fibers, polyamide fibers, acrylic fibers, cellulosic fibers, cotton, wool, and silk. Among these, polyester fibers are preferably used because they are effective in improving bulkiness and sustainability.
- the fineness of the hygroscopic fiber employed in the present invention is preferably 1 to 6 dtex, more preferably 1.7 to 5 dtex, and further preferably 2 to 4 dtex. If it is less than 1 dtex, the bulkiness and sustainability of the hygroscopic granular cotton may be insufficient. If it exceeds 6 dtex, it may be difficult to form granular cotton.
- the fiber length of the hygroscopic fiber employed in the present invention is preferably 20 to 80 mm, more preferably 20 to 40 mm, from the viewpoint of easy formation of granular cotton and the reduction of fluff protruding from the surface of the granular cotton. .
- the fiber length of the other fibers is preferably the same as that of the hygroscopic fiber employed in the present invention.
- the Young's modulus of the hygroscopic fiber employed in the present invention is preferably 7 to 20 cN / dtex, more preferably 7.5 to 18 cN / dtex, and still more preferably 8 to 15 cN / dtex.
- the Young's modulus is within the range of 7 to 20 cN / dtex, it is easy to form granular cotton, and the shape is not an irregular shape such as a rice grain shape or a tadpole shape, but can be obtained in a shape close to a sphere. It becomes easy.
- the fluff which protrudes from the surface of granular cotton can be decreased, and even when compressed, etc., each other is less likely to be entangled, and it is easy to show a good bulk recovery.
- the crimp rate of the hygroscopic fiber employed in the present invention is preferably 3 to 12%, more preferably 4 to 9%, and the number of crimps is preferably 4 to 12 peaks / 25 mm, more Preferably, it is 5 to 10 mountain / 25 mm. If the crimp ratio and the number of crimps are in the range, the entanglement between the fibers becomes an appropriate level during granulation, the hygroscopic fibers are efficiently taken into the granular cotton, and the fluff protruding from the surface of the granular cotton is reduced. However, it is also easy to obtain a shape that is almost a sphere, rather than an irregular shape such as rice grain or tadpole.
- the numerical value A represented by the following formula is preferably 0.050 or more and less than 0.080, more preferably 0.055 or more and less than 0.070.
- A Carboxyl group amount [mmol / g] / Ratio of surface layer cross section in fiber cross section [%]
- the numerical value A is a numerical value correlated with the concentration of the carboxyl group in the fiber surface layer portion.
- the larger this value the higher the concentration of carboxyl groups, which are polar functional groups, on the fiber surface, so static electricity during the formation of granular cotton can be suppressed, and in a rugged shape like a tadpole. It becomes easy to obtain almost in the shape of a sphere.
- the numerical value A is preferably 0.050 or more, and more preferably 0.055 or more.
- the numerical value A is 0.08 or more, the fiber surface layer portion becomes sticky due to moisture absorption, and the fibers tend to stick to each other. Or the ratio of the other fibers that are used together from the granular cotton may jump out due to the influence.
- a cation of an alkali metal such as lithium, sodium or potassium, a cation of an alkaline earth metal such as magnesium or calcium, manganese, copper can be selected according to the required properties from cations of other metals such as zinc and silver, ammonium ions and hydrogen ions.
- other metals such as zinc and silver, ammonium ions and hydrogen ions.
- sodium and potassium although the bulkiness is difficult to increase, the moisture absorption rate and the amount of moisture absorption increase, and when a polyvalent metal ion such as magnesium, calcium, or zinc is adopted, the moisture absorption rate is Although it becomes slow, it tends to increase the bulkiness.
- the hygroscopic granular cotton of the present invention preferably has an average diameter of 3 to 9 mm, more preferably 4 to 6 mm. Granulation with an average diameter of less than 3 mm is difficult. On the other hand, if the average diameter exceeds 9 mm, problems may occur during product processing such as blowing.
- the specific volume of the hygroscopic granular cotton of the present invention is preferably 100 cm 3 / g or more, more preferably 150 cm 3 / g or more, and further preferably 200 cm 3 / g or more from the viewpoint of obtaining sufficient bulkiness.
- the specific volume of the hygroscopic granular cotton of the present invention is preferably 100 cm 3 / g or more, more preferably 150 cm 3 / g or more, and further preferably 200 cm 3 / g or more from the viewpoint of obtaining sufficient bulkiness.
- a method for producing the hygroscopic fiber employed in the present invention a method of subjecting the surface layer portion of the acrylonitrile fiber to a crosslinking introduction treatment and a hydrolysis treatment can be employed.
- the acrylonitrile fiber used as a raw material can be produced from an acrylonitrile polymer by a known method.
- the acrylonitrile polymer preferably has an acrylonitrile content of 50% by mass or more, more preferably 80% by mass or more, and still more preferably 85% by mass or more.
- the crosslinked structure is formed by the reaction of the nitrile group of the acrylonitrile polymer and the crosslinking agent, when the acrylonitrile content in the acrylonitrile polymer is small, the amount that the crosslinked structure can be introduced decreases.
- the fiber strength may be insufficient in processing and practical use.
- a crosslinked structure is introduced into the surface layer of the acrylonitrile fiber as described above.
- a conventionally known crosslinking agent may be used, but it is preferable to use a nitrogen-containing compound from the viewpoint of the introduction efficiency of the crosslinked structure.
- the nitrogen-containing compound it is preferable to use an amino compound or a hydrazine compound having two or more primary amino groups.
- amino compounds having two or more primary amino groups include diamine compounds such as ethylenediamine and hexamethylenediamine, diethylenetriamine, 3,3′-iminobis (propylamine), N-methyl-3,3′-iminobis ( Triamine compounds such as propylamine), triethylenetetramine, N, N′-bis (3-aminopropyl) -1,3-propylenediamine, N, N′-bis (3-aminopropyl) -1,4- Examples include tetramine compounds such as butylenediamine, polyvinylamine, polyallylamine, and the like, and polyamine compounds having two or more primary amino groups.
- diamine compounds such as ethylenediamine and hexamethylenediamine, diethylenetriamine, 3,3′-iminobis (propylamine), N-methyl-3,3′-iminobis ( Triamine compounds such as propylamine), triethylenetetramine, N, N′-bis (3-aminopropy
- hydrazine compound examples include hydrazine hydrate, hydrazine sulfate, hydrazine hydrochloride, hydrazine hydrobromide, hydrazine carbonate, and the like.
- the upper limit of the number of nitrogen atoms in one molecule is not particularly limited, but is preferably 12 or less, more preferably 6 or less, and particularly preferably 4 or less. When the number of nitrogen atoms in one molecule exceeds the above upper limit, the cross-linking agent molecule becomes large and it may be difficult to introduce a cross-linked structure into the fiber.
- the conditions for introducing the cross-linked structure are not particularly limited, and can be appropriately selected in consideration of the reactivity between the cross-linking agent employed and the acrylonitrile fiber, the amount of the cross-linked structure, and the like.
- a hydrazine compound is used as the crosslinking agent
- the acrylonitrile fiber described above is immersed in an aqueous solution to which the hydrazine compound is added so that the hydrazine concentration is 0.1 to 10% by mass. And a method of treating at 2 ° C. for 2 to 10 hours.
- hydrolysis treatment with an alkaline metal compound is performed, and nitrile groups present in the surface layer portion of the fiber are hydrolyzed to form carboxyl groups.
- Specific treatment conditions may be set as appropriate in consideration of the above-mentioned carboxyl group concentration and the like, and various conditions such as the concentration of the treating agent, reaction temperature, reaction time, etc. may be set as appropriate, preferably 0.5 to 10% by mass, More preferably, a means for treating in a 1 to 5% by mass aqueous treatment chemical solution at a temperature of 80 to 150 ° C. for 2 to 10 hours is preferred from the industrial and fiber properties viewpoints.
- the above-described cross-linking introduction treatment and hydrolysis treatment are collectively performed simultaneously using an aqueous solution in which the respective treatment chemicals are mixed, rather than sequentially performing as described above. Furthermore, in the present invention, it is preferable that this simultaneous treatment is performed under mild conditions using a lower concentration of alkaline metal compound than before, and the subsequent acid treatment is performed under severer conditions at a higher temperature than before.
- the hygroscopic fiber of this invention can take the structure where many carboxyl groups existed in the narrow surface layer part conventionally, and the comparatively hard acrylonitrile-type polymer was preserve
- the formed carboxyl group includes a salt-type carboxyl group whose counter ion is a cation other than a hydrogen ion, and an H-type carboxyl group whose counter ion is a hydrogen ion.
- a salt-type carboxyl group whose counter ion is a cation other than a hydrogen ion
- an H-type carboxyl group whose counter ion is a hydrogen ion In order to obtain a high moisture absorption rate, it is desirable that 50% or more of the carboxyl groups are salt-type carboxyl groups.
- Methods for adjusting the ratio of salt-type carboxyl groups to H-type carboxyl groups within the above range include ion exchange treatment with metal salts such as nitrates, sulfates and hydrochlorides, and acid treatments with nitric acid, sulfuric acid, hydrochloric acid, formic acid, etc.
- a method of performing pH adjustment treatment with an alkaline metal compound or the like can be
- the method for producing the hygroscopic granular cotton of the present invention described above conventionally known methods and conditions can be employed. For example, the following methods can be mentioned.
- the hygroscopic fibers obtained as described above and fibers that are used in combination as needed are sufficiently opened using a card having a plurality of rollers with garnet wires provided on the surface.
- fibers that have been sufficiently opened are blown into a room provided with a rotating body having a plurality of fins in a cylindrical space where air turbulence is likely to occur, and can be taken out after turbulent stirring for a predetermined time.
- Japanese Patent Application Laid-Open No. 2007-169646 Japanese Patent Application Laid-Open No. 10-259559
- Japanese Patent Application Laid-Open No. 61-125377 Japanese Patent Publication No. 57-48 using a mechanical share
- Japanese Patent Application Laid-Open No. Sho 62-33856 Japanese Patent Application Laid-Open No. 62-27833 can be employed.
- the batting of the present invention may be a combination of other fiber cotton.
- other fiber cotton include feathers, wool, animal hair, silk, cotton, polyester fiber, polypropylene fiber, polyethylene fiber, polyamide fiber, acrylic fiber, cellulosic fiber, etc. be able to.
- Such batting of the present invention is used in contact with or close to the human body, for example, batting for duvets, padding for cushions and chairs, or batting for clothing items such as ski wear, winter clothes, coats, jumpers, gloves and semi-wraps. It can be particularly suitably used.
- Ratio of surface area cross-sectional area in fiber cross section Sample fiber is a bath ratio of 1:80 in a dyeing bath containing 2.5% cationic dye (Nicilon Black G 200) and 2% acetic acid based on the fiber mass. After being soaked and boiled for 30 minutes, it is washed with water, dehydrated and dried. The obtained dyed fiber is sliced thinly perpendicular to the fiber axis, and the fiber cross section is observed with an optical microscope. At this time, the central portion made of the acrylonitrile-based polymer is dyed black, and the surface layer portion having many carboxyl groups becomes green because the dye is not sufficiently fixed.
- Numerical value A carboxyl group amount [mmol / g] / ratio of surface layer cross-sectional area in fiber cross section [%]
- ⁇ Ratio of salt-type carboxyl group to H-type carboxyl group the amount of H-type carboxyl groups is calculated in the same manner except that the first immersion in 1 mol / l hydrochloric acid aqueous solution and the subsequent immersion in water (water washing) are not performed. By subtracting the amount of H-type carboxyl groups from the total amount of carboxyl groups, the amount of salt-type carboxyl groups is calculated, and the ratio of salt-type carboxyl groups to H-type carboxyl groups is determined.
- volume expansion coefficient (H2 ⁇ H1) / H1 ⁇ 100
- ⁇ Average diameter of granular cotton> Select 100 samples at random, measure the diameter with calipers, and determine the average value.
- the average value of the major axis and the minor axis is taken as the diameter of each sample.
- the obtained acrylic fiber was subjected to crosslinking introduction treatment and hydrolysis treatment simultaneously in an aqueous solution containing 0.5% by mass of hydrazine hydrate and 2.0% by mass of sodium hydroxide for 8 hours.
- the mixture was treated with a 100% aqueous nitric acid solution at 100 ° C. for 3 hours and washed with water.
- the obtained fiber was immersed in water, adjusted to pH 9 by adding sodium hydroxide, washed with water and dried to obtain hygroscopic fiber A.
- Table 1 The details and evaluation results of the obtained hygroscopic fibers are shown in Table 1.
- Examples 1 to 5 Each hygroscopic fiber and polyester fiber (fineness 3.3 dtex, fiber length 38 mm, crimp number 5.0 mountain / 25 mm, crimp degree 10.0%) are mixed at the ratio shown in Table 2, and the garnet wire is on the surface.
- Examples 1 to 5 all had good hygroscopicity and bulky restoring properties.
- Comparative Example 1 the amount of hygroscopic fibers was small and a sufficient moisture absorption rate was not obtained.
- the comparative example 2 since the numerical value A of the hygroscopic fiber used was large, it became a rice grain shape with many protruding fibers, and the volume expansion rate was inferior.
- Comparative Example 3 the Young's modulus of the hygroscopic fiber used was low and the volume expansion coefficient was inferior.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Artificial Filaments (AREA)
- Undergarments, Swaddling Clothes, Handkerchiefs Or Underwear Materials (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
(1) 架橋構造及びカルボキシル基を有する重合体からなる表層部と、アクリロニトリル系重合体からなる中心部とからなる吸湿性繊維を含有する粒状綿であって、下記の測定方法による体積膨張率が15%以上であり、かつ、20℃、相対湿度65%の環境下における吸湿率が4%以上であることを特徴とする吸湿性粒状綿。
<測定方法>
20℃、相対湿度65%RHの恒温恒湿機に24時間以上入れて調湿した試料を1000mlのメスシリンダー(内径63mm)の1000mlの目盛り位置まで投入する。次いで、試料の上に前記内径よりもやや小さい円形台紙(0.8g)を置き、その上に50g分銅をゆっくりと置く。分銅の沈み込みが静止するまで待ち、円形台紙の位置をメスシリンダーの目盛から読み取る(H1)。次いで、分銅を除き、1分間経過後の円形台紙の位置をメスシリンダーの目盛から読み取る(H2)。以上から、次式により体積膨張率を算出する。
体積膨張率[%]=(H2-H1)/H1×100
(2) 前記吸湿性繊維の含有量が10~70質量%であることを特徴とする(1)に記載の吸湿性粒状綿。
(3) 前記吸湿性繊維のヤング率が7~20cN/dtexであり、かつ、下記式で示される数値Aが0.050以上0.080未満であることを特徴とする(1)または(2)に記載の吸湿性粒状綿。
[式] A=カルボキシル基量[mmol/g]/繊維断面における表層部断面積の割合[%]
(5) (1)~(3)のいずれかに記載の吸湿性粒状綿を含有することを特徴とする中綿。
[式] A=カルボキシル基量[mmol/g]/繊維断面における表層部断面積の割合[%]
JIS L 1015:2010の「8.4 繊維長」、「8.5 繊度」、「8.11 初期引張抵抗度」、「8.12 けん縮」に従い測定する。
1.繊維断面における表層部断面積の割合
試料繊維を、繊維質量に対して2.5%のカチオン染料(Nichilon Black G 200)および2%の酢酸を含有する染色浴に、浴比1:80となるように浸漬し、30分間煮沸処理した後に、水洗、脱水、乾燥する。得られた染色済みの繊維を、繊維軸に垂直に薄くスライスし、繊維断面を光学顕微鏡で観察する。このとき、アクリロニトリル系重合体からなる中心部は黒く染色され、カルボキシル基が多く有する表層部は染料が十分に固定されず緑色になる。繊維断面における、繊維の直径(L1)、および、緑色から黒色へ変色し始める部分を境界として黒く染色されている中心部の直径(L2)を測定し、以下の式により表層部断面積の繊維断面積に占める割合を算出する。なお、10サンプルの平均値をとる。
繊維断面における表層部断面積の割合[%]=[{(L1/2)2π-(L2/2)2π}/(L1/2)2π]×100
繊維試料約1gを、50mlの1mol/l塩酸水溶液に30分間浸漬する。次いで、繊維試料を、浴比1:500で水に浸漬する。15分後、浴pHが4以上であることを確認したら、乾燥させる(浴pHが4未満の場合は、再度水洗する)。次に、十分乾燥させた繊維試料約0.2gを精秤し(W1[g])、100mlの水を加え、さらに、15mlの0.1mol/l水酸化ナトリウム水溶液、0.4gの塩化ナトリウムおよびフェノールフタレインを添加して撹拌する。15分後、濾過によって試料繊維と濾液に分離し、引き続き試料繊維を、フェノールフタレインの呈色がなくなるまで水洗する。このときの水洗水と濾液をあわせたものを、フェノールフタレインの呈色がなくなるまで0.1mol/l塩酸水溶液で滴定し、塩酸水溶液消費量(V1[ml])を求める。得られた測定値から、次式によって全カルボキシル基量を算出する。
カルボキシル基量[mmol/g]=(0.1×15-0.1×V1)/W1
上記で求めた数値を用いて下記式により算出する。
数値A=カルボキシル基量[mmol/g]/繊維断面における表層部断面積の割合[%]
上記のカルボキシル基量の測定方法において、最初の1mol/l塩酸水溶液への浸漬およびそれに続く水への浸漬(水洗)を実施しないこと以外は同様にして、H型カルボキシル基量を算出する。かかるH型カルボキシル基量を上記の全カルボキシル基量から差し引くことで、塩型カルボキシル基量を算出し、塩型カルボキシル基とH型カルボキシル基の比を求める。
試料を20℃、相対湿度65%RHの恒温恒湿機に24時間以上入れ、吸湿量が平衡になるまで静置する。次いで、調湿した試料を1000mlのメスシリンダー(内径63mm)に少量ずつ入れて、突きこまないように注意しながら、棒で均一になるように均し、1000mlの目盛り位置まで試料を投入する。次に、投入した試料を取り出し、105℃で5時間乾燥した後の質量(W2[g])を測定する。以上から、次式により比容積を算出する。
比容積[cm3/g]=1000/W2
上記の比容積の測定方法と同様にして、試料を1000mlのメスシリンダー(内径63mm)の1000mlの目盛り位置まで投入する。次いで、試料の上に前記内径よりもやや小さい円形台紙(0.8g)を置き、その上に50g分銅をゆっくりと置く。分銅の沈み込みが静止するまで待ち、円形台紙の位置をメスシリンダーの目盛から読み取る(H1)。次いで、分銅を除き、1分間経過後の円形台紙の位置をメスシリンダーの目盛から読み取る(H2)。以上から、次式により体積膨張率を算出する。
体積膨張率[%]=(H2-H1)/H1×100
試料約2.5gを、熱風乾燥器で105℃、16時間乾燥して質量を測定する(W3[g])。次に、該試料を、温度20℃、相対湿度65%に調節した恒温恒湿器に24時間入れておく。このようにして吸湿した試料の質量を測定する(W4[g])。これらの測定結果から、次式によって20℃×65%RH吸湿率を算出する。
20℃×65%RH吸湿率[%]=(W4-W3)/W3×100
無作為に試料100個を選び、直径をノギスで測定し、平均値を求める。ここで、粒状綿が球状で無い場合は長径と短径の平均値を各試料の直径とする。
目視による観察によって形状および毛羽の状態を確認した。
アクリロニトリル90質量%、アクリル酸メチルエステル10質量%のアクリロニトリル系重合体(30℃ジメチルホルムアミド中での極限粘度[η]=1.5)を48質量%のロダンソーダ水溶液で溶解して、紡糸原液を調製した。該紡糸原液を常法に従って紡糸、水洗、延伸、捲縮、熱処理をして、単繊維繊度1.7dtexのアクリル繊維を得た。
製造例1において、水酸化ナトリウムの濃度を1.5質量%とすること以外は同様にして、吸湿性繊維Bを得た。得られた吸湿性繊維の詳細と評価結果を表1に示す。
製造例1において、水酸化ナトリウムの濃度を2.5質量%とすること以外は同様にして、吸湿性繊維Cを得た。得られた吸湿性繊維の詳細と評価結果を表1に示す。
製造例1において、アクリル繊維の単繊維繊度を0.9dtexとし、水加ヒドラジンおよび水酸化ナトリウムを含有する水溶液中での処理を95℃×2時間とすること以外は同様にして、吸湿性繊維Dを得た。得られた吸湿性繊維の詳細と評価結果を表1に示す。
製造例1において、水酸化ナトリウムの濃度を3.5質量%とすること以外は同様にして、吸湿性繊維Eを得た。得られた吸湿性繊維の詳細と評価結果を表1に示す。
製造例1において、水酸化ナトリウムを添加してpH9に調整する工程を行わないこと以外は同様にして、吸湿性繊維Fを得た。得られた吸湿性繊維の詳細と評価結果を表1に示す。
表2に示す割合で各吸湿性繊維とポリエステル繊維(繊度3.3dtex、繊維長38mm、捲縮数5.0山/25mm、捲縮度10.0%)を混合し、ガーネットワイヤーが表面に設けられた複数のローラを有するカードで、開繊を十分に行い、空気の乱流の起きやすい円筒状の空間の中で複数のフィンが着いて回転する回転体が設けられた部屋の中に、繊維を吹き込み所定時間乱流撹拌後に取り出せるようにした装置で、吸湿性粒状綿を得た。得られた粒状綿の特性を表2に示す。
Claims (4)
- 架橋構造及びカルボキシル基を有する重合体からなる表層部と、アクリロニトリル系重合体からなる中心部とからなる吸湿性繊維を含有する粒状綿であって、下記の測定方法による体積膨張率が15%以上であり、かつ、20℃、相対湿度65%の環境下における吸湿率が4%以上であることを特徴とする吸湿性粒状綿。
<測定方法>
20℃、相対湿度65%RHの恒温恒湿機に24時間以上入れて調湿した試料を1000mlのメスシリンダー(内径63mm)の1000mlの目盛り位置まで投入する。次いで、試料の上に前記内径よりもやや小さい円形台紙(0.8g)を置き、その上に50g分銅をゆっくりと置く。分銅の沈み込みが静止するまで待ち、円形台紙の位置をメスシリンダーの目盛から読み取る(H1)。次いで、分銅を除き、1分間経過後の円形台紙の位置をメスシリンダーの目盛から読み取る(H2)。以上から、次式により体積膨張率を算出する。
体積膨張率[%]=(H2-H1)/H1×100 - 前記吸湿性繊維の含有量が10~70質量%であることを特徴とする請求項1に記載の吸湿性粒状綿。
- 前記吸湿性繊維のヤング率が7~20cN/dtexであり、かつ、下記式で示される数値Aが0.050以上0.080未満であることを特徴とする請求項1または2に記載の吸湿性粒状綿。
[式] A=カルボキシル基量[mmol/g]/繊維断面における表層部面積の割合[%] - 請求項1~3のいずれかに記載の吸湿性粒状綿を含有することを特徴とする中綿。
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| WO2015041275A1 (ja) * | 2013-09-20 | 2015-03-26 | 日本エクスラン工業株式会社 | 架橋アクリレート系繊維および該繊維を含有する繊維構造物 |
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