JP2844307B2 - Method for producing modified acetate fiber fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a modified acetate fiber cloth in which constituent fibers have extremely fine crimps.

[0002]

2. Description of the Related Art In the field of textiles for clothing, various modifications and improvements have been made from natural fibers to synthetic fibers due to diversification and sophistication of consumer needs. For the acetate fiber, gloss and texture are improved by changing the fiber cross section, fiber surface, and yarn form, and crimping is a typical example. As a method for imparting crimp to acetate fibers, false twisting in which twisting, heat setting, and untwisting are performed by a high-speed rotating false twist spindle and a heater has become mainstream.

[0003] Generally, the texture of a fabric using a crimped yarn differs depending on the fineness of the crimp of the yarn. In particular, a fabric made of a finely crimped yarn has a unique appearance and a feeling of touch. There is expected.

[0004]

However, in the false twisting method, the fiber strength is mainly a limiting factor, and it is difficult to form a fine crimp on the acetate fiber. As a method of imparting crimp to the acetate fiber by a method other than false twisting, a method of immersing the swelling agent aqueous solution with an inclined angle after preliminary stretching in Japanese Patent Publication No. 47-37205 to generate random crimps is known. Although disclosed, it is not possible to obtain a fine crimp of 5,000 pieces / m or more even by this method.

[0005] The present invention solves the problems of the prior art, and imparts a fine crimp, particularly 5,000 or more crimps, to the acetate fibers constituting the acetate fiber cloth in the fiber axis direction, It is an object of the present invention to obtain a modified acetate fiber fabric having a smooth gloss and a silky texture.

[0006]

The gist of the present invention is that an acetate fiber cloth is saponified with an aqueous solution of an alkali compound to convert the surface layer of the acetate fiber into cellulose, and then immersed in an aqueous solution of a cellulolytic enzyme to form a cellulose layer. Is a method for producing a modified acetate fiber cloth, which comprises immersing in an aqueous solution of a solvent that swells and plasticizes the acetate fibers to generate crimps in the fiber axis direction.

[0007] The acetate fibers in the present invention include:
A diacetate fiber having an acetylation degree of 45 to 59.5% and a triacetate fiber having an acetylation degree of more than 59.5% are used.

[0008] The acetate fiber cloth in the present invention refers to a cloth composed of acetate fibers, and may contain other fibers if the acetate fibers are characteristically contained as fibers constituting the cloth. There is no particular limitation on the quantitative ratio. Examples of the form of the fabric include a woven fabric, a knitted fabric, and a nonwoven fabric.

In the present invention, it is necessary to saponify the acetate fiber cloth with an aqueous solution of an alkali compound to convert the surface layer of the acetate fiber into cellulose, and the saponification treatment of the acetate fiber with the alkali compound requires the use of the enzyme used in the present invention. Since it is an enzyme that degrades cellulose, the acetyl group of the acetate fiber is once replaced with a hydroxyl group to convert it into cellulose. In the saponification treatment of the present invention, a cationic activator such as a quaternary ammonium salt can be used in combination with the alkali compound.

The alkali compound used in the saponification treatment in the present invention includes alkali metal hydroxides such as caustic potash and caustic soda, alkaline earth metal hydroxides such as calcium hydroxide and magnesium hydroxide, sodium hydrogen carbonate, and soda ash. Conjugate salts of strong alkalis and weak acids.

The saponification treatment with an alkali compound varies depending on the degree of acetylation and the degree of modification of the acetate fibers constituting the fabric, but is converted into an aqueous solution containing 2 to 40% owf (weight relative to the acetate fibers) and from room temperature to 130 ° C. The acetate fiber cloth is treated by dipping, padding, etc. for 1 to 120 minutes under heating at a temperature of ° C. to convert the fiber surface layer of the acetate fibers into cellulose.

Next, the saponification treatment is followed by treatment with a cellulolytic enzyme. The cellulolytic enzyme used in the treatment of the present invention is a cellulase that hydrolyzes cellulose, and originates from filamentous fungi such as Trichoderma and Aspergillus. It can be easily obtained as a cellulolytic enzyme preparation under the trade name of Onozuka R-10 (manufactured by Yakult), Meiselase (manufactured by Meiji Seika), Cell Clast 1.5L (manufactured by Novo).

The treatment with the cellulolytic enzyme varies depending on the degree of saponification, the degree of texture required, etc., but the saponified acetate fiber cloth is treated with a cellulose degrading enzyme (cellulase) at a pH of 3.5 to 7.0 and a temperature of 20 to 65 ° C. ) 1
It is treated by immersion in a 50 g / l aqueous solution. By this enzyme treatment, the cellulose layer of the acetate fiber is decomposed and removed. The enzyme remaining on the fibers of the fabric can be easily deactivated by heating, such as immersion in hot water of 80 ° C. or higher.

In the present invention, after the cellulose layer is decomposed and removed by the cellulolytic enzyme, it is further immersed in an aqueous solution of a solvent that swells or plasticizes the acetate fibers. Examples of the solvent in the solvent aqueous solution include acetone, 1,4 dioxane, dimethylformamide, and a water-soluble solvent that dissolves acetate fibers such as diacet alcohol.In the present invention, the solvent does not dissolve the acetate fibers. It is used as a solvent aqueous solution that swells or plasticizes.

The conditions of the immersion treatment in the solvent aqueous solution differ depending on the degree of acetylation of the acetate fiber and the solvent. For example, in the case of using diacetate fiber having an acetylation degree of about 50% for the acetate fiber and acetone as the solvent, Concentration 25-3
The immersion treatment is performed under the conditions of a 5 wt% aqueous solution and a temperature of 50 to 60 ° C.

By the immersion treatment in the solvent aqueous solution, crimps are generated in the fiber axis direction of the acetate fibers constituting the fabric. The resulting crimp is an extremely fine crimp in which the crimps are present in the fiber axis direction in an amount of 5,000 / m or more. Therefore, the obtained acetate fiber cloth has a smooth luster and a silky texture. Play.

[0017]

The present invention will be described below in more detail with reference to examples.

Example 1 Five-sheet satin woven fabric composed of diacetate fibers having a degree of acetylation of 56.9% (warp: Bright 75d)
/ 21f, weft: dull 100d / 27f, density: 20
(0 / inch, weft density: 87 / inch) was scoured by a 6-tank continuous scouring machine and then dried. This scoured cloth is clothed at a speed of 40 m.
/ Dip into caustic soda aqueous solution at 24 ° Baume / min
After 2 nips and pre-drying with a far infrared heater, 100 ° C
For 4 minutes, washed with water in an open soaper at room temperature to remove alkalis, and then dried in a cylinder at 120 ° C. to obtain a diacetate fiber-treated cloth having a fiberized cellulose surface.

Next, the treated cloth was treated with Cell Crust 1.5.
L (cellulolytic enzyme preparation manufactured by Novo) 5 g / l, Bioassist MT (nonionic penetrant manufactured by Moriroku) 5 g / l
After enzymatic treatment for 4 hours while stirring in an aqueous solution having a bath ratio of 1: 100, 53 ° C. and pH 4.8, and washing with water,
The sample was immersed in a 30 wt% aqueous solution of acetone at a free temperature for 10 minutes and then dried. In the obtained woven fabric, the constituent fibers have a fine crimp of 8,000 / m in the fiber axis direction,
In addition, the yarn partially had a twist corresponding to 20,000 turns / m, and was a woven fabric having a smooth gloss and a silky texture.

(Comparative Example 1) Bright 100d / 27f diacetate fiber was supplied at 80 m / min with an overfeed rate of -4% by a false twisting machine (LS-6 manufactured by Mitsubishi Heavy Industries, Ltd.) at 160 ° C. 3,0 while contacting the heater temperature
False twisting was performed at 00 turns / m with Z twist. 100 threads of this processed yarn
It was immersed in hot water of 10 ° C. for 10 minutes in a free state and then dried. When the number of crimps in the fiber axis direction of the obtained yarn was measured, the number of crimps was 2,960 pieces / m, and the false twist resistance of this diacetate fiber was 3,460 times / m. ,
A textured yarn having a twist of 5,000 turns / m could not be obtained at all.

[0021]

According to the present invention, the acetate fibers constituting the acetate fiber cloth are formed into fibers having fine crimps which are hardly formed by the conventional method, so that the fine crimps are used. It is possible to obtain a modified acetate fiber cloth which has a smooth luster and a silky feel and retains excellent coloring properties of acetate fibers.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mutsumi Yamazaki 4-160 Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Mitsubishi Rayon Co., Ltd. Product Development Research Laboratory (72) Inventor Isao Isao 4-Chome Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture No. 1-60 Mitsubishi Rayon Co., Ltd. Product Development Research Institute (72) Inventor Moto Ito 4-160 Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture Mitsubishi Rayon Co., Ltd. Product Development Research Laboratory (56) References JP-A-2-216282 (JP, A) JP-A-61-245367 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06M 11/00-16/00

Claims (1)

(57) [Claims] 1. An acetate fiber cloth is saponified with an aqueous solution of an alkali compound to convert the surface layer of the acetate fiber into cellulose, and then immersed in an aqueous solution of a cellulolytic enzyme to decompose and remove the cellulose layer, and then swell the acetate fiber. A method for producing a modified acetate fiber cloth, comprising: immersing in a solvent aqueous solution to be plasticized to generate crimps in the fiber axis direction.