JPH10259568A - Modified acetate fiber woven or knitted fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a modified acetate fiber woven or knitted fabric having soft surfaces having swollen and waxy touches and excellent in touches by forming fine cellulose fibrils on the surfaces of acetate fibers. SOLUTION: This modified fiber woven or knitted fabric in which the fibers placed at least on the surfaces of the woven or knitted fabric comprise modified acetate fibers each having a two-layered structure comprising an inner layer produced from cellulose acetate and a surface layer produced from cellulose is obtained by saponifying an acetate fiber woven or knitted fabric in an alkali compound aqueous solution under the mutual sliding treatment of the woven or knitted fabrics to convert the cellulose acetate in the surface layers of the acetate fibers into the cellulose, or further rubbing the fabric in a wet state to form fine fibrils on the cellulose in the fiber surface layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified acetate fiber woven / knitted fabric excellent in texture and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, in the field of textiles for clothing, various modifications and improvements have been made to various natural fibers and chemical fibers due to diversification of consumer needs and the trend toward higher grades. Modification that changes the texture and design, such as the feeling and dryness, is one of them.

[0003] For example, as a modification for improving the feel and design, polyester fibers are disclosed in JP-A-6-24.
No. 8512 discloses that a fiber containing a metal salt of an organic sulfonic acid in a polymer is subjected to weight reduction treatment with an aqueous solution of an alkaline compound to form fibrils on the fiber surface. JP-A-8-269 discloses acetate fibers.
No. 812, the fiber into which inorganic fine particles are kneaded is treated with an alkaline aqueous solution to convert the fiber surface layer into cellulose, and the cellulose portion is decomposed and removed with a cellulolytic enzyme to form fine crater-like irregularities on the fiber surface. Is disclosed.

On the other hand, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-269812, a dope and a coagulating liquid are subjected to high shear stress conditions in a micronizing zone of a nozzle as a fibrillated cellulose ester substance itself such as cellulose acetate. Mixing and leaching the solvent from the cellulose ester to form fibrils is disclosed. However, in the case of the acetate fiber, as in the case of the polyester fiber, for forming fine fibrils only on the fiber surface without damaging the fiber matrix,
It was not previously known.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a modified acetate having fine fibrils of cellulose formed on the surface layer of acetate fibers and having a soft and swelling and slimy woven / knitted surface and excellent texture. It is to provide a fiber woven or knitted fabric.

[0006]

The gist of the present invention is that at least the fibers located on the surface of the woven or knitted fabric have a two-layer structure of cellulose acetate in the inner layer, cellulose in the surface layer, and fine cellulose in the surface layer. A modified acetate fiber woven or knitted fabric, characterized by being composed of modified acetate fibers forming a fibril.

The woven or knitted fabric made of acetate fibers is saponified with an aqueous solution of an alkali compound while sliding the woven or knitted fabric with each other to convert the cellulose acetate on the surface layer of the acetate fiber into cellulose, or is further subjected to rubbing treatment in a wet state. A method for producing a modified acetate fiber woven or knitted fabric, characterized in that fine fibrils are formed on cellulose in a fiber surface layer.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The modified acetate fiber constituting the modified acetate fiber woven or knitted fabric of the present invention has an inner layer having an acetylation degree of 4 or less.
It is a cellulose acetate of 5.0 to 59.5% cellulose diacetate or cellulose triacetate having an acetylation degree of 59.5% or more, and has a two-layer structure in which the surface layer is cellulose, and all of the cellulose in the surface layer. Alternatively, a part thereof forms microfibrous fine fibrils branched and finely divided in a fiber axis direction.

The ratio of cellulose acetate in the inner layer to cellulose in the surface layer of the modified acetate fiber may be arbitrarily determined according to the desired degree of modification, the type of fiber used, the type and amount of other fibers to be mixed, and the like. Although it can be set, it is preferable that the cellulose acetate is in the range of 3 to 95% by weight by weight. If the cellulose acetate content is less than 3% by weight, the decrease in fiber strength becomes extremely difficult to withstand abrasion,
If it exceeds 95% by weight, very poor cellulose fine fibrils are present. The fiber form of the modified acetate fiber may be any of filament and staple.

In the modified acetate fiber woven or knitted fabric of the present invention, the whole of the woven or knitted fabric may be constituted by the modified acetate fiber, but at least all or a part of the fiber located on the surface of the woven or knitted fabric is modified. It is preferable to be composed of modified acetate fibers. Further, the modified acetate fiber woven or knitted fabric of the present invention includes natural fibers such as cotton and hemp, rayon, polynosic fibers, recycled fibers such as cupra or nylon fibers, polyester fibers, and acrylic fibers, as long as the object of the present invention is not impaired. Synthetic fiber such as fiber is blended, blended,
It may be included in composite false twist, ply twist, cross weaving, cross knitting or the like.

Hereinafter, a method for producing the modified acetate fiber woven or knitted fabric of the present invention will be described. The modified acetate fiber woven or knitted fabric of the present invention is obtained by saponifying an woven or knitted fabric made of acetate fibers with an aqueous solution of an alkali compound while sliding the woven or knitted fabric, so that the cellulose acetate on the surface portion of the acetate fiber is converted to cellulose, or further wet. It is manufactured by forming fine fibrils in cellulose on the fiber surface layer by rubbing. The saponification of cellulose acetate refers to a reverse reaction of esterification that produces cellulose and acetate under the action of alkali.

The acetate fibers used in the method of the present invention include cellulose diacetate fibers having an acetylation degree of 45.0 to 59.5% and cellulose triacetate fibers having an acetylation degree of 59.5% or more, such as filaments or staples. Any of the above forms may be used. The acetate fiber woven or knitted fabric is obtained by weaving or knitting using a yarn composed of acetate fibers, and the woven structure and the network structure are not particularly limited, but the effect of the modified acetate fiber of the present invention is effectively exhibited. In order to achieve this, it is preferable that at least all or a part of the fibers located on the surface of the woven or knitted fabric are composed of acetate fibers. At the time of spinning, weaving or knitting, natural fibers, regenerated fibers or synthetic fibers may be mixed by blending, blending, composite false twisting, twisting, cross-weaving or cross-knitting, as long as the object of the present invention is not impaired. Good.

Next, the woven or knitted fabric is subjected to a saponification treatment with an aqueous alkali compound solution while sliding between the woven or knitted fabrics to convert the cellulose acetate in the surface portion of the acetate fiber into cellulose, and the cellulose in the surface portion of the fiber is finely or partially dispersed. To form fine fibrils. The formation of fine fibrils on cellulose by the cellulose fiber of cellulose acetate on the surface layer portion of the acetate fiber and the sliding of the woven and knitted fabric by saponification can be performed in the form of a thread, but for streamlining the process,
In addition, it is desirable to carry out the treatment in the form of a woven or knitted fabric from the viewpoint of handling of the modified acetate fiber yarn.

The saponification treatment needs to be performed with an aqueous solution of an alkali compound while sliding the acetate fiber woven or knitted fabric. The saponification treatment requires an apparatus capable of forming a sliding state between the woven or knitted fabric in a liquid flow. As such an apparatus, for example, a liquid jet dyeing machine, a Wins dyeing machine, a normal pressure washer, a continuous relaxation machine and the like are preferably used.

Examples of the alkali compound used in the aqueous alkali compound solution include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide and magnesium hydroxide, sodium hydrogen carbonate, and anhydrous sodium hydrogen carbonate. A conjugate salt of a strong alkali and a weak acid such as sodium carbonate is exemplified. The saponification treatment is preferably performed at room temperature to 120 ° C. for 5 to 120 minutes with an aqueous solution of an alkali compound having a concentration of 0.5 to 40% by weight (based on the weight of acetate fiber).

In the method of the present invention, the saponification treatment converts the cellulose acetate in the surface layer of the woven or knitted fabric into cellulose, and forms fine fibrils in the cellulose of the modified acetate fiber on the surface and partially inside the woven or knitted fabric. The modified acetate fiber woven / knitted fabric is further rubbed in a wet state to further promote the formation of fine fibrils of cellulose on the surface layer of the modified acetate fiber on the surface of the woven / knitted fabric, and the inside of the woven / knitted fabric. Fibrils are also well formed on the cellulose in the surface layer of the modified acetate fiber.

For the rubbing treatment, a liquid jet dyeing machine, a Wins dyeing machine, a normal pressure washer, a continuous relaxation machine, etc., similar to those used in the saponification treatment are used.
In water for 5 to 120 minutes. This rubbing treatment may be performed simultaneously with the dyeing. The woven or knitted fabric obtained by the saponification treatment or the further rubbing treatment may be subjected to a raising treatment in a dry state to adjust the hair.

[0018]

The present invention will be described below in more detail with reference to examples. In the examples, the ratio of cellulose acetate to cellulose in the modified acetate fiber was determined by cutting the modified acetate fiber to a length of 2 to 3 mm, and using a solvent for the acetate fiber (acetone for cellulose diacetate fiber and acetone for cellulose triacetate fiber). Methylene) for 48 hours to dissolve the cellulose acetate and calculate from the remaining amount of cellulose.

Example 1 Cellulose triacetate filament yarn (Bright 75 denier / 20 filament) having a degree of acetylation of 61.3% was used as a warp, and the degree of acetylation was 61.3%.
% Cellulose triacetate filament yarn (Bright 100 denier / 26 filament) was used as the weft to fabricate a satin woven fabric having a warp density of 200 yarns / inch and a weft density of 87 yarns / inch, scouring and drying. The woven fabric was put into a 20% by weight aqueous solution of sodium hydroxide (based on the weight of acetate fiber) having a bath ratio of 1:20 by using a liquid jet dyeing machine, and the temperature was changed from 30 ° C. to 2 ° C. /
The fabric was saponified at 110 ° C. for 90 minutes while sliding between the fabrics.

In the resulting modified acetate fiber woven fabric, the surface layer of the constituent fibers is converted to cellulose, and fine fibrils are formed in the cellulose of the surface layer of the fiber on the surface of the woven fabric.
The woven fabric surface was soft, had a swelling feeling, and was excellent in texture. The weight loss rate in the saponification treatment was 20.7%, and in the modified acetate fiber of the obtained woven fabric, the cellulose triacetate in the inner layer portion was 65.8%, and the cellulose in the surface layer portion was 34.2%. .

Example 2 In Example 1, after the saponification treatment, the woven fabric was further poured into warm water at 55 ° C. using a jet dyeing machine, and rubbed for 60 minutes. The obtained modified acetate fiber woven fabric has fine fibrils formed on the cellulose surface and the surface layer of the fiber inside the woven fabric better, and the woven fabric surface is soft, has a swelling feeling, and is extremely excellent in texture. there were.

(Comparative Example 1) In Example 2, without saponification treatment, the woven fabric was put into warm water at 55 ° C and rubbed for 60 minutes using a liquid jet dyeing machine in the same manner as in Example 2. .
In the obtained woven fabric, the fiber surface layer is not cellulosed,
No cellulose fibrils were formed.

(Example 3) A 1200 t / m twisted yarn of a cellulose triacetate filament yarn (bright 75 denier / 20 filament) having a degree of acetylation of 61.3% and a polyethylene terephthalate filament yarn (semi dull 20 denier / 12 filament) was used. The knitted fabric was knitted using the same, and after scouring, was dried. Using a jet dyeing machine,
The solution was poured into a 30% by weight aqueous solution of sodium hydroxide (based on the weight of acetate fibers) having a bath ratio of 1:20, and the temperature was raised at a rate of 2 ° C./min from 30 ° C. and saponified at 110 ° C. for 90 minutes while sliding between the fabrics. Processed.

In the obtained knitted fabric of modified acetate fiber, the surface layer of the cellulose triacetate fiber of the knitted fabric is converted to cellulose, and fine fibrils are formed in the cellulose of the surface layer of the modified cellulose triacetate fiber on the surface of the knitted fabric. I was The weight loss rate in the saponification treatment was 32.1%.
In the modified cellulose triacetate fiber constituting the obtained knitted fabric, the cellulose triacetate in the inner layer portion was 7.5%, and the cellulose in the surface layer portion was 92.5%. Furthermore, the modified acetate fiber knitted fabric was put into warm water at 55 ° C. using a jet dyeing machine and subjected to a rubbing treatment for 120 minutes.
In the obtained knitted fabric, fine fibrils are better formed on the surface of the knitted fabric and the cellulose on the surface of the modified cellulose triacetate fiber surface layer, and the knitted fabric surface is soft, has a swelling feeling, and is extremely excellent in texture. Was something.

(Comparative Example 2) In Example 3, without kneading, the knitted fabric was rubbed with hot water at 55 ° C for 120 minutes using a jet dyeing machine in the same manner as in Example 3. In the obtained knitted fabric, the fiber surface layer was not converted into cellulose, and no cellulose fibrils were generated.

(Example 4) A cellulose triacetate filament yarn (bright 75 denier / 20 filament) having a degree of acetylation of 61.3% was used as a warp, and a polyethylene terephthalate filament false twisted yarn (semi-dal 75 denier / 36 filament) was used as a weft. Density of 20
Weaving 5 satin woven fabrics with 0 / inch, weft density 83 / inch,
After scouring, it was dried. This woven fabric is put into a 25% by weight aqueous solution of sodium hydroxide (based on the weight of acetate fiber) having a bath ratio of 1:20 using a liquid jet dyeing machine, and the temperature is raised from 30 ° C. at a rate of 2 ° C./min. The fabric was saponified for 90 minutes while sliding between the fabrics.

In the obtained modified acetate fiber woven fabric, the surface layer of the cellulose triacetate fiber of the woven fabric was converted to cellulose, and fine fibrils were formed in the cellulose of the surface layer of the modified cellulose triacetate fiber on the surface of the woven fabric. The weight loss rate in the saponification treatment was 25.7%.
In the modified cellulose triacetate fiber constituting the obtained woven fabric, the cellulose triacetate in the inner layer portion was 24.5%, and the cellulose in the surface layer portion was 75.5%. Further, this modified acetate fiber woven fabric was put into warm water of 55 ° C. using a liquid jet dyeing machine and subjected to rubbing treatment for 120 minutes. The obtained woven fabric has fine fibrils formed more favorably on the cellulose on the surface of the woven fabric and on the surface of the modified cellulose triacetate fiber surface layer, and the woven fabric surface is soft, swelling, and extremely excellent in texture. Was.

(Comparative Example 3) In Example 4, without saponification treatment, the woven fabric was put into warm water at 55 ° C and rubbed for 120 minutes using a liquid jet dyeing machine in the same manner as in Example 4. . In the obtained woven fabric, the fiber surface layer was not cellulose-ized, and no cellulose fibrils were generated.

[0029]

The modified acetate fiber woven or knitted fabric of the present invention
Fine fibrils of cellulose are formed on the surface layer of the constituting acetate fiber, and the surface of the woven or knitted fabric is soft and has a swelling feeling, a slimy feeling and an excellent texture, and the texture and design of the conventional acetate fiber woven and knitted fabric. Are different and are suitably used in various clothing applications.

[Brief description of the drawings]

FIG. 1 is an electron micrograph (1500 times magnification) of a fiber surface of a modified acetate fiber in a modified acetate fiber woven fabric of the present invention according to Example 2.

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI D06M 101: 08

Claims (2)

[Claims] 1. A modified acetate fiber in which a fiber located at least on the surface of a woven or knitted fabric has a two-layer structure of cellulose acetate in the inner layer and cellulose in the surface layer, and the cellulose in the surface layer forms fine fibrils. A modified acetate fiber woven or knitted fabric characterized by comprising: 2. A woven or knitted fabric made of acetate fibers is saponified with an aqueous alkali compound solution while sliding the woven or knitted fabric with each other to convert cellulose acetate on the surface of the acetate fiber into cellulose, or is further subjected to a rubbing treatment in a wet state. A method for producing a modified acetate fiber woven / knitted fabric, wherein fine fibrils are formed on cellulose in a fiber surface layer.