JPH093773A - Fiber structure and its production - Google Patents

Abstract

PURPOSE: To produce a simple and inexpensive fiber structure excellent in a mass feeling and moisture permeable performance, having durability, not damaging characteristics of a synthetic fiber itself constituting the fiber structure. CONSTITUTION: This fiber structure is impregnated with a resin. The resin is a cross-linked product of a protein. The fiber structure is obtained by impregnating a fiber structure, in which the cross-linking bond of the cross-linked product is a bond between a γ-carboxamide group as the glutamine reside of an amino acid constituting the protein and an ε-amino group as the lysine residue, with the protein and transglutaminase and heat-treating the fiber structure to form an insolubilized product as the cross-linked protein in the fiber structure.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a fiber structure.
More specifically, it relates to a fiber structure having excellent hygroscopicity and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, the comfort of a synthetic fiber cloth has been examined depending on the climate in the clothes, and it has been said that the improvement of the moisture absorption performance is essential as a major factor in improving the comfort.

As a method for imparting hygroscopicity to synthetic fibers, a post-processing method is, in particular, a graft copolymerization of polyester with acrylic acid, followed by a neutralization treatment.
Although a method of introducing a —COONa group and the like have been proposed, there are problems that it is difficult to increase the graft ratio and that the mechanical properties decrease when the graft ratio is increased.

On the other hand, attempts have been made to hydrophilize the synthetic fiber itself at the time of spinning, and a method of copolymerizing polyoxyalkylene ether or the like has been proposed, but such a method provides sufficient hygroscopicity. In order to obtain it, it is necessary to increase the copolymerization ratio, and it is the current situation that fibers having both hygroscopicity and mechanical properties have not been obtained.

Further, these methods also have a problem that the processing steps are complicated.

[0006]

The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to utilize a naturally-derived protein, so that it is possible to provide a fiber structure and an aqueous system which are excellent in texture, moisture absorption performance and durability. It is an object of the present invention to provide a simple and low-cost method for producing a fiber structure, which does not impair the properties of the synthetic fiber itself because it utilizes an enzymatic reaction.

[0007]

The fiber structure of the present invention has the following constitution in order to solve the above problems.

That is, a fibrous structure impregnated with a resin, wherein the resin is a cross-linked product of a protein, and the cross-linked bond of the cross-linked product is a glutamine residue of amino acids constituting the protein γ- It is a fiber structure characterized by a bond between a carboxamide group and an ε-amino group which is a lysine residue.

Further, the method for producing a fiber structure of the present invention has the following constitution in order to solve the above problems.

That is, by impregnating the fiber structure with protein and transglutaminase and heat-treating,
A method for producing a fiber structure, which comprises forming an insolubilized product which is a crosslinked protein in the fiber structure.

[0011]

The fiber structure of the present invention will be described in detail below.

In the present invention, the term "impregnating a fiber structure with a resin" means that the resin is soaked in a resin solution so that the resin forms a fiber structure. It means that it is present on at least one of the surfaces, and that the resin is fixed or coated on the monofilament filaments or staples of the yarn bundle.

The fact that the resin is a cross-linked product of protein means that
The impregnated resin is a protein, and the molecular chains of the protein are cross-linked by the production process to insolubilize it to form a three-dimensional structure.

The cross-linking of the cross-linking product is a bond between the γ-carboxamide group, which is a glutamine residue of amino acids constituting a protein, and the ε-amino group, which is a lysine residue, of the enzyme used in the present invention. (Transglutaminase) depending on the reaction type, and refers to the bond formed by the substrate specificity of the enzymatic reaction.

In the present invention, the presence of the protein cross-linked by the enzymatic reaction in the fiber structure constituting the cloth makes it possible to exhibit high hygroscopicity.

Next, the method for producing the fiber structure of the present invention will be described.

In the production method of the present invention, a fiber structure is impregnated with a mixed aqueous solution of a protein and transglutaminase and heated to promote an enzymatic reaction to form an insolubilized product of the protein.

The cross-linked protein used in the present invention is not limited to its origin, and any protein such as plant protein or animal protein can be used.

The vegetable protein includes defatted plant seeds and proteins separated therefrom, that is, soybean protein,
Wheat protein or the like can be used.

Animal proteins include milk proteins (casein etc.), gelatin, collagen, keratin,
An aqueous solution such as fibroin can be used.

The transglutaminase used in the present invention is an acyl transferase belonging to EC 2.3.2.13 and is dependent on Ca 2+ derived from animals, and does not require Ca 2+ dependence derived from plants or fungi. Etc. can be used.

In the present invention, impregnating a fiber structure with a protein and transglutaminase means adjusting a mixed aqueous solution of a protein to be crosslinked and transglutaminase to a pH and a protein concentration suitable for an enzymatic reaction, and crosslinking the protein with the aqueous protein solution. It means that the required amount of transglutaminase is added and immersed in the prepared aqueous solution.

From the viewpoint of enzyme reaction rate and film forming property, the pH is preferably 4 to 11, and more preferably 5 to 8.

In the case of an enzymatic reaction, the protein concentration is less likely to proceed if the concentration of the protein that is the substrate is low, but in the case of the present invention, the progress of the reaction is promoted because the protein is concentrated by the heat treatment described later. It For this reason, the protein concentration in the mixed aqueous solution is preferably 0.5% by weight or more, and may be any concentration considering the processability of the fiber structure.

The amount of transglutaminase required for protein crosslinking is preferably 0.1 unit or more per 1.0 g of the protein to be crosslinked.

From the stability of the enzyme, an aqueous solution may be used as appropriate.
It is also preferable to add an SH protective substance such as dithiothreitol or glutathione.

If the enzyme used is Ca 2+ -dependent, it is sufficient to add it so that the Ca 2+ concentration in the mixed aqueous solution is usually 10 mM.

Further, the heat treatment promotes the promotion of the enzymatic reaction in the mixed aqueous solution impregnated in the fiber structure by immersion and the promotion of the reaction due to the increase of the protein concentration by decreasing the water content of the mixed aqueous solution. At the same time, finally, the purpose is to evaporate the water content of the fixed crosslinked protein.

As the heat treatment method, any of the conventional methods of dry heat treatment using dry heat air and wet heat treatment of dry heat air and steam can be used.

The heat treatment temperature is preferably 10 ° C. or higher, more preferably 30 ° C. or higher, from the viewpoints of the progress of enzyme reaction, enzyme deactivation, water evaporation and process passability. The fiber structure of the present invention can be obtained by heat treatment for 1 minute to 2 hours, although it depends on the concentration of the protein to be crosslinked, the amount of added enzyme or the heat treatment temperature.

As described above, since the treatment liquid is an aqueous system and utilizes an enzyme reaction with substrate specificity, the action on the synthetic fiber is small and the fiber characteristics do not change.

Further, since it is an aqueous enzymatic reaction, problems such as collection and disposal of chemicals can be solved.

The fiber structure in the present invention means wool,
A natural fiber such as silk or cotton, a synthetic fiber such as nylon, polyester, or acrylic, and a material produced by blended spinning, blended knitting, or blended fiber of these, specifically, a cloth or the like.

In the case of protein fibers such as wool and silk, and polyamide fibers such as nylon, the terminal amino group also participates in the cross-linking due to the enzymatic reaction, so that the adhesion between the fiber and the protein is further improved.

[0035]

The present invention will be described in more detail below with reference to Examples and Comparative Examples.

Evaluation of moisture absorption and durability of crosslinked protein in Examples were carried out according to the following methods.

[Hygroscopicity] A test piece was put in a weighing bottle, and the lid was placed with the lid half opened.

The weighing bottle is placed at a temperature of 20 ± 2 ° C. and a relative humidity of 6
The sample was placed in a constant temperature and humidity chamber of 5 ± 2% and left for 4 hours, then the lid was immediately closed and the weight was measured.

Open the lid of the container half again, and at 110 ° C.,
After drying for an hour, the lid was immediately closed and the weight was measured.

Moisture absorption was calculated by the following formula from the weight obtained by subtracting the weight of the weighing bottle from the weight obtained above.

Moisture absorption (%) = [(weight of test piece when absorbing moisture-
Absolutely dry weight) × 100] / absolutely dry weight [Durability of crosslinked protein] A test piece was put in a weighing bottle and placed with the lid half opened.

The weighing bottle was completely dried at a temperature of 110 ° C. for 1 hour, then the lid was immediately closed, and the weight was measured.

The sample was immersed in boiling water (90 ° C.) for 10 minutes.

After the immersion, the sample was air-dried, put in a weighing bottle again, and completely dried at a temperature of 110 ° C. for 1 hour, then the lid was immediately closed and the weight was measured.

The absolute dry weight before the immersion was subtracted from the absolute dry weight after the immersion to obtain a weight change rate of 5% with respect to the protein adhesion rate to the sample.
The following was defined as a durable crosslinked film.

The following proteins and enzymes were used in the examples.

Protein: Gelatin purified powder (manufactured by Nacalai Tesque, Inc.) Enzyme: Transglutaminase (EC 2.3.2.1)
3) Enzyme origin: Streptobert silium actinomycete enzyme activity: 1000 units / g [Example 1] The purified gelatin powder was dissolved in ion-exchanged water to prepare a 3 wt% aqueous solution, and the pH was adjusted to 6. To this aqueous solution, transglutaminase was added so that 1.25 units per 1 g of protein were added to prepare an impregnation treatment liquid.

A plain woven fabric using polyester filament yarn with both warp and weft of 75 denier for the base fabric,
It was immersed in the impregnating solution prepared as described above, immersed and squeezed three times, and then incubated at 37 ° C. for 2 hours. After the incubation, the target fiber structure was obtained by drying at 100 ° C. and deactivating the enzyme. The amount of protein fixed was 3.26% based on the weight of the fabric.

As shown in Table 1, it has excellent hygroscopicity, and
A fiber structure having excellent film durability was obtained.

[0050]

[Table 1] [Example 2] A target fiber structure was obtained in the same manner as in Example 1 except that the base fabric was a plain woven fabric using 70 denier nylon filament yarn for both warp and weft. The amount of protein fixed was 4.08% based on the weight of the fabric.

As shown in Table 1, it has excellent hygroscopicity, and
A fiber structure having excellent film durability was obtained.

Comparative Example 1 A fiber structure was prepared in the same manner as in Example 1 except that the enzyme was not added. The amount of protein fixed was 3.18% based on the weight of the fabric.

As shown in Table 1, a fibrous structure having hygroscopicity but inferior film durability was obtained because no enzyme was added.

[0054]

According to the present invention, the texture is good, and
It is possible to obtain a simple and low-cost method for producing a fiber structure that does not impair the characteristics of the fiber structure having excellent moisture absorption performance and durability and the synthetic fiber itself that constitutes the fiber structure.

Claims (7)

[Claims] 1. A fibrous structure impregnated with a resin, wherein the resin is a cross-linked product of a protein, and the cross-linked bond of the cross-linked product is a glutamine residue of amino acids constituting the protein. Carboxamide group and lysine residue ε
-A fibrous structure characterized in that it is a bond between amino groups. 2. The fiber structure according to claim 1, wherein the protein is a vegetable protein or an animal protein. 3. A method for producing a fiber structure, which comprises impregnating a fiber structure with a protein and transglutaminase and heat-treating the same to form an insolubilized product which is a crosslinked protein in the fiber structure. Method. 4. A transglutaminase is EC2.3.
The method for producing a fiber structure according to claim 3, which is an acyltransferase belonging to 2.13. 5. The method for producing a fiber structure according to claim 3, wherein the pH of the mixed aqueous solution is 4 to 11. 6. The method for producing a fiber structure according to claim 3, wherein the protein concentration in the mixed aqueous solution is 0.5% by weight or more. 7. The method for producing a fiber structure according to claim 3, wherein the heat treatment temperature is 10 ° C. or higher.