Cellulose-based graft fiber, fiber structure including the same, and manufacturing method therefor

Abstract

To provide: a cellulose-based graft fiber that is excellent in quick drying and durability by imparting quick drying to a cellulose-based fiber represented by cotton fiber (cotton); a fiber structure including the fiber; and a method for manufacturing the fiber structure.SOLUTION: A method is intended to manufacture a cellulose-based graft fiber in which a cellulose-based fiber is graft polymerized with a (meth)acrylic acid-containing compound, and a fiber structure including the fiber. This manufacturing method includes radiating an electron beam to cotton of a cellulose-based fiber, sliver, spun yarn, fabric, knitted article, or non-woven fabric under a nitrogen gas atmosphere by an electron beam irradiation device; and before, after, or simultaneously with a radical generation step, bringing it into contact with an aqueous solution including (meth)acrylic acid-containing compound, washing, dewatering, and drying.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cellulose-based graft fiber, a fiber structure containing the same, and a method for producing the same. [Background technology]

[0002] Natural cellulose fibers, such as cotton, are environmentally friendly and have excellent texture, dyeability, and water absorption properties, making them widely used in a variety of clothing. However, cotton fibers have a problem in that they absorb moisture slowly, making them slow to dry once they have absorbed sweat. Patent Document 1 proposes the use of a (meth)acrylic acid ester monomer and a (meth)acrylate compound containing an N group or a hydroxyl group as a surface treatment agent for fibers. Patent Document 2 proposes an antibacterial treatment agent containing an esterification product obtained by esterifying undecylenic acid with a compound having a polymerizable unsaturated group. Patent Document 3 proposes a polyester knitted fabric having a divinyl polymer attached to its surface. Patent Document 4 proposes a fiber structure having a polyethylene glycol di(meth)acrylate polymer attached to the surface of an acetal fiber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-38993 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-210665 [Patent Document 3] Japanese Patent Application Publication No. 2019-85680 [Patent Document 4] Japanese Patent Application Laid-Open No. 2017-57534 Summary of the Invention [Problem to be solved by the invention]

[0004] However, these treatment agents are intended for hydrophobic fibers such as polyester, and are not intended to be applied to cellulosic fibers.

[0005] In order to solve the above-mentioned conventional problems, the present invention provides a cellulose-based graft fiber, which is obtained by imparting quick-drying properties to a cellulose-based fiber, typically cotton, and which is excellent in quick-drying properties, functional durability, etc., a fiber structure containing the same, and a method for producing the same. [Means for solving the problem]

[0006] One embodiment of the present invention relates to a cellulose-based graft fiber obtained by graft-polymerizing a (meth)acrylic acid-containing compound represented by any one of the following general formulas (Chemical Formula 1) to (Chemical Formula 4) onto a cellulose-based fiber. [ka] [ka] [ka] [ka] However, R 1 , R 3 is H or CH3(R 1 and R 3 may be the same or different). 2 is a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkylene group (the position of the unsaturated double bond may be anywhere), an alkyl group containing a carbonyl group (COR), an alkylene group containing a carbonyl group (the position of the unsaturated double bond may be anywhere), or an aromatic group having 6 to 12 carbon atoms. 4 is a carbon chain with 1 to 4 carbon atoms or its isomer. n is 1 to 100.

[0007] As the (meth)acrylic acid-containing compound represented by any one of the above (Chemical Formula 1) to (Chemical Formula 4), R 4Those with different carbon numbers can also be used. For example, an oxyethylene group having 2 carbon atoms and an oxypropylene group having 3 carbon atoms can be used in combination, and the total number of repeating units n of each functional group is 2 to 100. Examples of repeating units based on alkyl chains having 1 to 4 carbon atoms include oxymethylene groups, oxyethylene groups, oxypropylene groups, methyloxyethylene groups, oxybutylene groups, methyloxypropylene groups, 1,1-dimethyloxyethylene groups, 2,2-dimethyloxyethylene groups, 1,2-dimethyloxyethylene groups, and ethyloxyethylene groups.

[0008] Another embodiment of the present invention relates to a fibrous structure comprising the cellulosic graft fibers described above.

[0009] Yet another embodiment of the present invention provides a method for producing a cellulose-based fiber, comprising: a radical generating step of generating radicals in a cellulose-based fiber cotton, sliver, spun yarn, woven fabric, knitted fabric, or nonwoven fabric; a step of contacting a cellulosic fiber with an aqueous solution containing any one of the (meth)acrylic acid-containing compounds represented by (Chemical Formula 1) to (Chemical Formula 4) before, after, or simultaneously with the radical generation step; The present invention relates to a method for producing cellulose-based grafted fibers, which includes a process of washing, dehydrating, and then drying. [Effects of the Invention]

[0010] The present invention provides a cellulose-based graft fiber having quick-drying properties and highly durable functions, a fiber structure containing the same, and a method for producing the same, by graft-polymerizing a cellulose-based fiber with any of the (meth)acrylic acid-containing compounds represented by Chemical Formula 1 to Chemical Formula 4. That is, the cellulose-based graft fiber having quick-drying properties and highly durable functions and a fiber structure containing the same can be obtained by firmly bonding a (meth)acrylic acid-containing compound to the cellulose-based fiber by graft polymerization without using environmentally unfriendly compounds such as fluorine-based resins. DETAILED DESCRIPTION OF THE INVENTION

[0011] The oxyethylene group (-CH2CHO-) used in the present invention, and more generally, the oxyalkylene group, alkyleneoxy group, and oxyalkyl group, are hydrophilic, and therefore monomers having these groups are usually applied to the surface of hydrophobic fibers such as polyester fibers in order to improve the hydrophilicity of the fibers, or are used as part of resins (polymers) in order to adjust the hydrophilicity of fiber processing agents. The present inventors unexpectedly discovered that quick-drying properties can be improved by grafting a compound containing an oxyethylene group, which has a hydrophilic effect, onto hydrophilic cotton, and this discovery led to the completion of the present invention.

[0012] The present invention is a cellulose-based graft fiber obtained by graft-polymerizing a (meth)acrylic acid-containing compound represented by any one of the general formulas (Chemical Formula 1) to (Chemical Formula 4) onto a cellulose-based fiber. For example, in the above (Chemical Formula 2), R 1 , R 3 A compound where n is CH3 and n is 14 is available from NOF Corporation under the trade name PDE-600. The bifunctional quick-drying monomer may be polyalkylene glycol dimethacrylate, which may also be a diacrylate. For dimethacrylates, n is more preferably 2 to 20. The carbon-carbon double bond between the cellulose-based fiber and the (meth)acrylic acid-containing compound represented by the formulas (Chemical Formula 1) to (Chemical Formula 4) is cleaved to form a graft bond with the cellulose-based fiber.

[0013] Cellulose-based fibers have the chemical structure shown below (Chemical Formula 5) (where n is the repeating unit), and have six hydroxyl groups in one repeating unit. They also have a fibril structure (a structure in which many molecules are arranged in a spiral along the length of the fiber), making them hydrophilic and absorbent, meaning that they easily adsorb water and, once they adsorb water, they do not let it go. In the present invention, a compound containing an oxyethylene group, which has a hydrophilic effect, is grafted onto cellulosic fibers, thereby interfering with the bonding between the hydroxyl groups of the cellulose molecules and water, reducing hydrophilicity and thereby resulting in quick-drying properties. [ka]

[0014] The compounds of the formulas (1) to (4) are preferably grafted in an amount of 0.5 to 30 parts by mass, more preferably 0.5 to 20 parts by mass, and even more preferably 0.5 to 15 parts by mass, per 100 parts by mass of cellulosic fibers. This allows for improved quick-drying properties. The amount of the (meth)acrylic acid-containing compound attached can be calculated by AB, where A is the mass of the sample after processing and B is the mass of the sample before processing. The amount of attachment is also expressed as the graft ratio, which can be calculated by 100 × (AB) / B (%).

[0015] Cellulosic fibers include natural fibers such as cotton and hemp, and regenerated fibers such as rayon. Of these, cotton is the most versatile for clothing and is therefore preferred.

[0016] The fiber structure containing cellulose-based graft fibers preferably has a diffusible residual moisture content, as defined below, of 30% or less, more preferably 27% or less, and even more preferably 24% or less. The diffusible residual moisture content is determined by fixing a sample to an embroidery frame with a diameter of approximately 90 mm, dropping 0.2 mL or 0.3 mL of water onto the center of the sample fabric in an environment of 20°C and 65% RH, measuring the weight after 60 minutes, and calculating the content using the following formula: Diffusible residual moisture content (%) = [moisture weight (g) after 60 minutes / moisture weight (g) at the start of measurement] x 100 When the fiber structure is a yarn, the diffusible residual moisture regain is measured by preparing a woven or knitted fabric sample from the yarn.

[0017] The fiber structure of the present invention is a fiber structure containing the above-mentioned cellulose-based graft fiber. The fiber structure is preferably a spun yarn, fabric, woven fabric, knitted fabric, or nonwoven fabric. In particular, it is preferably a fiber fabric for clothing, or clothing using the same. Among these, it is preferably innerwear. Cellulose fibers, typified by cotton fibers, are suitable for innerwear such as shirts, pants, T-shirts, knit shirts, and socks because of their comfortable fit, and are even more preferable if their quick-drying properties are improved.

[0018] The proportion of the cellulose-based grafted fibers contained in the fiber structure can be adjusted by the processing method. When the fiber structure is a fabric, if the raw cotton (raw cotton) is grafted, the function can be adjusted by mixing the cellulose-based grafted fibers with unprocessed fibers when producing yarn. Furthermore, the function can be adjusted by using the yarn in combination with another yarn to produce fabric. The function can also be adjusted by grafting the yarn, by using another yarn in combination when producing fabric. When grafting is performed on fabric, the entire fabric becomes the cellulose-based grafted fibers.

[0019] When the fiber structure contains the cellulose-based grafted fiber and the unprocessed fiber, the two may be mixed so that the cellulose-based grafted fiber and the unprocessed fiber account for 5 to 40 mass% and 60 to 95 mass% of the fiber structure, respectively, more preferably 5 to 35 mass% and 65 to 95 mass% of the unprocessed fiber, respectively, based on 100 mass% of the fiber structure. The unprocessed fiber includes natural fibers such as cotton and hemp, regenerated fibers such as rayon, and synthetic fibers such as polyester, nylon, and acrylic.

[0020] The method for producing a cellulose-based graft fiber of the present invention includes the following steps. (1) Radical generation process In this process, cellulosic fiber cotton, sliver, spun yarn, woven fabric, knitted fabric, or nonwoven fabric is irradiated with electron beams in a nitrogen gas atmosphere using an electron beam irradiation device. The electron beam irradiation may be performed either before or after (or simultaneously with) the addition of the quick-drying property-imparting monomer, but irradiation with electron beams in a nitrogen atmosphere is preferred because the generated radicals are less likely to be deactivated. (2) Contact with treatment liquid Before, after, or simultaneously with the radical generation step, the fiber is contacted with an aqueous solution containing any of the (meth)acrylic acid-containing compounds represented by the general formulas (Chemical Formula 1) to (Chemical Formula 4) (also referred to as "quick-drying property-imparting monomer" in this specification). Contacting methods include immersion, padding, spraying, and textile printing, and any of these methods can be used. Graft bonds are formed through various reactions, such as a reaction in which radicals are generated on the surface of the cellulosic fiber by means such as electron beam irradiation, a reaction in which the generated radicals are grafted onto the surface of the cellulosic fiber by contacting the quick-drying property-imparting monomer, and a reaction in which the radicals generated on the quick-drying property-imparting monomer bind to additional quick-drying property-imparting monomers. The quick-drying property-imparting monomer is preferably added in an amount of 0.5 to 30% by mass, more preferably 0.5 to 20% by mass, and even more preferably 0.5 to 15% by mass, relative to the cellulosic fiber. Within this range, quick-drying properties can be exhibited even when mixed or blended with unprocessed fibers. (3) After washing and dehydration, drying process Wash with water, dehydrate, and then dry according to the usual method.

[0021] The fabric of the present invention is preferably a knitted or woven fabric. Knitted fabrics and woven fabrics are suitable for use as innerwear. Knitted fabrics are particularly stretchy and flexible, making them suitable for use as innerwear. Knitted fabrics include circular knitting, weft knitting, warp knitting (including tricot knitting and raschel knitting), and pile knitting, and may be of any knitting structure, such as plain knitting, jersey knitting, rib knitting, smooth knitting (double knitting), rib knitting, purl knitting, Denbigh knitting, cord knitting, atlas knitting, chain knitting, insertion knitting, and combinations thereof. Various interlace knitting methods are used to produce knitted fabrics. Interlace knitted fabrics may be warp knitting or weft knitting, and examples include tricot, raschel knitting, and circular knitting. Furthermore, the knitted structure may be any knitting structure, such as half knitting, reverse half knitting, double atlas knitting, double Denbigh knitting, and combinations thereof. Examples of woven fabrics include plain weave, twill weave, satin weave, varied plain weave, varied twill weave, varied satin weave, variegated weave, patterned weave, single-ply weave, double weave, multi-ply weave, warp pile weave, weft pile weave, leno weave, and combinations thereof. Among these, weft knitted fabrics including circular knitting, or warp knitted fabrics are preferred.

[0022] The mass per unit area of ​​the fabric (basis weight) is 80 to 300 g / m 2 is preferable, and more preferably 90 to 250 g / m 2 and more preferably 100 to 250 g / m 2 If it is in the above range, it is suitable for use as innerwear.

[0023] In the present invention, an elastic yarn may be inserted into the fabric. The elastic yarn is preferably at least one selected from polyurethane yarn and conjugate yarn obtained by conjugation spinning of at least two polymers with different shrinkage rates. The polyurethane elastic yarn may be any type, but is not particularly limited, as long as it is made from a polymer diol and a diisocyanate as starting materials. The conjugate yarn is a conjugated yarn obtained by conjugation spinning of at least two polymers with different shrinkage rates. The conjugate yarn exhibits crimp (crimp) even in the raw yarn stage, but exhibits even greater crimp (crimp) upon application of heat. Specifically, a conjugate yarn (bicomponent yarn) of polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) is preferred. Examples of such latent crimp-type stretch yarns include "Lycra T400" (manufactured by Toray Opelontex Co., Ltd.), "Spandy" (manufactured by KB Seiren Co., Ltd.), and "Z10" (manufactured by Unitika Ltd.). A commonly used elastic thread is a polyurethane thread.

[0024] For example, in weft-knitted and circular-knitted fabrics, bare spandex yarn is often inserted as a plating yarn for loop yarns, while in warp-knitted fabrics, bare spandex yarn is inserted by insertion weave or weft insertion. For so-called innerwear, circular knitting is usually used, and elastic yarn, particularly polyurethane elastic yarn, is used as a plating yarn for loop yarns. Polyurethane elastic yarn is usually inserted as a plating yarn in a stretched state about 2.5 times its original length.

[0025] Clothing sewn from the quick-drying fabric of the present invention is preferably a so-called one-way stretch fabric, in which the elastic yarns are arranged in the circumferential direction of the body. The circumferential direction of the body refers to the circumferential direction of the torso and the circumferential direction of the arms. This results in innerwear that is comfortable to wear and does not easily lose its shape even after repeated washing. The clothing is preferably a shirt or pants. The innerwear of the present invention has cotton as the main fiber at 85% by mass or more, preferably 88% by mass or more, and more preferably 90% by mass or more, making it gentle on the skin.

[0026] In the present invention, a spun yarn that maintains its water absorbency and has quick-drying properties is obtained by blending and fine-spinning a treated sliver that has been grafted to a cellulosic graft fiber with other untreated slivers. Blending is usually performed using a drawing process that includes a doubling step. However, blending can also be performed using a carding process, roving process, or fine-spinning process. The blending can be achieved by aligning multiple webs, slivers, fleeces, and roving yarns and stretching them to a predetermined ratio. In the roving and fine-spinning processes, blending can be achieved by migration of the constituent fibers during twisting. Furthermore, the treated spinning sliver can be returned to the blending process to achieve the desired blend ratio.

[0027] After blending the cellulosic fiber grafted with the quick-drying monomer and the non-quick-drying processed cellulosic fiber, the blended spun yarn (A) is obtained by a conventional method. The spun yarn of the non-quick-drying processed cellulosic fiber is also obtained by a conventional method. A quick-drying fabric is made by using predetermined amounts of the blended spun yarn (A), spun yarn (B), and elastic yarn (C). This fabric can optionally be post-processed by conventional methods, such as bleaching, dyeing, and softening. The above is an example of a blended spun yarn containing cellulosic fibers grafted with quick-drying monomers and non-quick-drying processed cellulosic fibers, but it may also be a sheath-core spun yarn containing cellulosic fibers grafted with quick-drying monomers and non-quick-drying processed cellulosic fibers. [Example]

[0028] The present invention will be described below using examples, but it should be understood that the present invention is not limited to the following examples. [Evaluation method] <Diffusible Residual Moisture Content> (Examples 1-11, 21, 22 and Comparative Examples 1-4, 7) The diffusible residual moisture content is measured by fixing the sample to an embroidery frame with a diameter of approximately 90 mm, dropping 0.2 mL of water onto the center of the fabric in an environment with a temperature of 20°C and a relative humidity of 65%RH, measuring the weight every 5 minutes, and continuing until the weight reaches 60 minutes, and then calculating using the following formula. Diffusible residual moisture content (%) = [moisture weight (g) at any time elapsed / moisture weight (g) at the start of measurement] x 100 <Diffusible Residual Moisture Content> (Examples 12-20 and Comparative Examples 5 and 6) The diffusible residual moisture content is calculated by dropping 0.3 mL of water onto the center of the fabric in an environment of 20°C temperature and 65% relative humidity, hanging it to dry, and then measuring the weight after 60 minutes and using the following formula. Diffusible residual moisture content (%) = [moisture weight (g) after 60 minutes / moisture weight (g) at the start of measurement] x 100

[0029] (Examples 1-11) <Example of fabric processing> One side of a 100mm x 300mm piece of desized 100% cotton broadcloth was irradiated with electron beams in a nitrogen gas atmosphere using an electron beam irradiator (EC250 / 30 / 90L; Iwasaki Electric Co., Ltd.) at an accelerating voltage of 200kV and an exposure dose of 40kGy. The irradiated fabric was placed in a 50mL plastic container, and 50mL of a monomer aqueous solution of the specified concentration (see Tables 2 and 3) was added. The container was then left to stand at room temperature for 20 minutes. After standing, the fabric was removed, washed with water, dehydrated, and air-dried. The fabric processed into desized and finished fabric was refined and bleached in the usual way to prepare an evaluation sample.

[0030] (Comparative Examples 1-4) <Fabric> A 100% cotton broadcloth fabric that had been desized and bleached in the usual way was used as a comparison sample.

[0031] Example 12 <Cotton processed knitting example> A 200mm x 300mm piece of raw AAC (Australian cotton) sliver wrap was irradiated with an electron beam under a nitrogen gas atmosphere using an electron beam irradiation system (EC250 / 30 / 90L; Iwasaki Electric Co., Ltd.) at an accelerating voltage of 200kV and a dose of 40kGy. The irradiated cotton was placed in a plastic tray, and 150mL of an aqueous solution containing 3wt% M-130G (methoxypolyethylene glycol #550 methacrylate; Shin-Nakamura Chemical Co., Ltd.), 0.5wt% anionic surfactant, and 0.1wt% antifoaming agent was added. The cotton was then left to stand at room temperature for 20 minutes. After standing, the cotton was removed, washed with water, dehydrated, and dried at 60°C. Unprocessed cotton was blended with processed cotton to achieve blend ratios of 10% and 30%, and spun yarns were produced using a quick spin system (model: QSS-2000, manufactured by SDL International LTD). These yarns were used to produce knitted fabrics on a circular knitting machine, which were then scoured and bleached in the usual way, and then finished to prepare the evaluation samples.

[0032] Example 13 Cotton slivers (mass per unit length: 25.0 g / 6 yd (4.56 g / m)) were irradiated with electron beams at a dose of 40 kGy and an acceleration voltage of 200 kV under a nitrogen atmosphere using an electrocurtain-type electron beam irradiation system EC250 / 30 / 90L (manufactured by Iwasaki Electric Co., Ltd.). Immediately after the electron beam irradiation, the slivers were immersed in PDE-600 (polyalkylene glycol dimethacrylate; CH2=C(CH3)COO(CH2CHO)) containing 1.0 wt% penetrant and 0.1% defoamer. n The cotton sliver was immersed in an 8% by mass aqueous solution of C(O)C(CH3)=CH2, (n≒14), manufactured by NOF Corporation, and squeezed with a mangle to obtain a pickup rate of approximately 100% by mass based on the sliver weight. The sliver was then washed with water to remove any unreacted monomer, and then dried at 80°C. The cotton sliver obtained by this grafting process is hereinafter referred to as "processed cotton." The processed cotton and the ungrafted cotton (hereinafter referred to as unprocessed cotton) were blended in the blending process, and then spun into a yarn with a cotton count of 30 through a normal spinning process. The proportion of processed cotton in the blended yarn was set to 20% by weight. The blended yarn containing the processed cotton was used to knit a plain knit fabric using a circular knitting machine. After that, it was scoured and bleached by the usual method, and the finished product was used as an evaluation sample.

[0033] Example 14 The blended yarn containing 20% ​​by weight of the processed cotton and the regular 30 count cotton spun yarn not containing the processed cotton were used as the supply yarns in a ratio of two regular cotton spun yarns to one blended yarn containing the processed cotton, and a plain knit fabric was knitted using a circular knitting machine. After that, the fabric was scoured and bleached in the usual way, and then finished to be used as an evaluation sample.

[0034] (Examples 15 to 20) Knitted fabrics were produced by setting the concentration of processing chemicals, the blended cotton content in the blended yarn, and the ratio of blended yarn to regular cotton spun yarn in the knitted fabric as shown in Table 3. After that, they were scoured and bleached by the usual method, and the finished product was used as the evaluation sample.

[0035] Examples 21 to 22 As shown in Table 3, the concentrations of processing agents and the desizing conditions were as follows: 100% cotton broadcloth fabric was used, and fabrics were prepared in the same manner as in Examples 1-11 to be used as evaluation samples.

[0036] (Comparative Example 5) <Cotton knit fabric> Yarn was made using a quick spin system using 100% raw cotton, and knitted fabric was made using a circular knitting machine. After scouring and bleaching in the usual way, the fabric was finished and used as a comparison sample.

[0037] (Comparative Example 6) <Cotton knit fabric> 100% unprocessed cotton was used, and yarn with a cotton count of 30 was spun through the usual spinning process, and knitted fabric was made on a circular knitting machine. After scouring and bleaching in the usual way, the finished fabric was used as a comparison sample.

[0038] (Comparative Example 7) <Fabric> A 100% desized cotton broadcloth that had been scoured and bleached in the usual way was used as a comparison sample.

[0039] The above conditions and results are summarized in Tables 2 to 10. Table 2 shows a list of the chemicals used, Table 3 shows a list of chemical concentrations and fabrics, and Tables 4 to 10 show data on diffusible residual moisture content. In Tables 4 to 7 and 10, the Examples and Comparative Examples in the same table were measured simultaneously.

[0040] For reference, the graft ratio (graft ratio by weight) was measured. One side of a 100% bleached cotton broadcloth measuring 100 mm x 300 mm was irradiated with electron beams using an electron beam irradiation device (EC250 / 30 / 90L; manufactured by Iwasaki Electric Co., Ltd.) under a nitrogen gas atmosphere at an acceleration voltage of 200 kV and an exposure dose of 40 kGy. The irradiated fabric was placed in a 50 mL plastic container, and 50 mL of a monomer aqueous solution of a predetermined concentration (see Tables 1 and 2) was added and allowed to stand at room temperature for 20 minutes. After standing, the fabric was removed, washed with water, dehydrated, air-dried, and weighed to calculate the graft ratio. Graft polymerization of the quick-drying property-imparting monomer of the present invention can be confirmed by a color reaction with cobalt ammonium thiocyanate.

[0041] [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] [Table 6] [Table 7] [Table 8] [Table 9] [Table 10]

[0042] As is clear from Tables 4 to 10, each Example had a lower diffusible residual moisture regain than the Comparative Examples. Example 12 was sewn into an inner shirt and subjected to a wear test. It was confirmed that the shirt had high quick-drying properties, good moisture absorption and release properties, and was not stuffy, making it comfortable to wear and gentle on the skin. It was also confirmed that the quick-drying properties were high even after repeated home washing, and that the functionality was durable. [Industrial Applicability]

[0043] The quick-drying fabric of the present invention and quick-drying clothing using the same are suitable for innerwear such as shirts and pants. In addition, because they are gentle on the skin, they are also suitable for T-shirts and the like.

Claims

1. A cellulose-based graft fiber obtained by graft-polymerizing a (meth)acrylic acid-containing compound represented by any one of the following general formulas (Chemical Formula 1) to (Chemical Formula 4) onto a cellulose-based fiber. 【Chemical 1】 【Chemistry 2】 【Chemistry 3】 【Chemistry 4】 However, R 1 , R 3 is H or CH 3 (R 1 and R 3 may be the same or different). R 2 is a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkylene group (the position of the unsaturated double bond may be anywhere), an alkyl group containing a carbonyl group (COR), an alkylene group containing a carbonyl group (the position of the unsaturated double bond may be anywhere), or an aromatic group having 6 to 12 carbon atoms. R 4 represents a C1 to C4 carbon chain or an isomer thereof. n is 1 to 100.

2. The cellulosic graft fiber according to claim 1 , wherein the cellulosic fiber is cotton.

3. The cellulosic graft fiber according to claim 1 , wherein the cellulosic graft fiber is a quick-drying fiber.

4. A fiber structure comprising the cellulose-based graft fiber according to any one of claims 1 to 3.

5. The fiber structure according to claim 4, wherein the fiber structure is a spun yarn, a woven fabric, a knitted fabric, or a nonwoven fabric.

6. The fiber structure according to claim 5, wherein the fiber structure comprises 100% by mass of the cellulose-based grafted fiber and the unprocessed fiber, and the fiber structure comprises 5 to 40% by mass of the cellulose-based grafted fiber and 60 to 95% by mass of the unprocessed fiber.

7. The fiber structure according to claim 5 , wherein the fiber structure is an inner garment.

8. A method for producing a cellulose-based graft fiber according to any one of claims 1 to 4, A radical generating step of generating radicals in cellulose fiber cotton, sliver, spun yarn, woven fabric, knitted fabric or nonwoven fabric; a step of contacting a cellulosic fiber with an aqueous solution containing any one of the (meth)acrylic acid-containing compounds represented by (Chemical Formula 1) to (Chemical Formula 4) before, after, or simultaneously with the radical generation step; A method for producing cellulose-based grafted fibers, comprising the steps of washing with water, dehydrating, and then drying.

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