JPH05339878A - Synthetic fiber having improved hygroscopicity - Google Patents

Abstract

PURPOSE:To obtain a synthetic fiber having excellent hygroscopicity and moisture-releasing property and exhibiting excellent washing resistance by filling a natural protein in a hollow part of a synthetic fiber having a hollow part extending in the direction of the fiber axis and preferably crosslinking and infusibilizing the protein. CONSTITUTION:A synthetic fiber having a hollow part extending in the direction of the fiber axis, preferably a hollow polyester synthetic fiber is subjected to thinning treatment with a caustic alkali agent to form through-holes extending between the fiber surface and the hollow part. The obtained synthetic fiber is immersed in a solution of a natural protein (especially sericin) under reduced pressure to introduce the protein into the hollow part. After removing water used as the solvent, the fiber is heat-treated to obtain the objective synthetic fiber having high hygroscopicity an moisture-releasing property and excellent washing resistance. The protein is preferably crosslinked and infusibilized with an aldehyde, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic fiber having improved hygroscopicity and a method for producing the same.

[0002]

2. Description of the Related Art Various techniques for improving hygroscopicity of synthetic fibers such as polyester and nylon have been known. Specifically, those obtained by grafting hygroscopic (water) monomers such as sodium acrylate, vinylpyrrolidone, and N-methylolacrylamide onto the fiber surface, and hygroscopic (water) such as sodium polyacrylate, polyvinylpyrrolidone, and modified starch. It is known that the surface of the fiber is provided with a hydrophilic polymer together with a crosslinking agent and a binder. However, the conventional technology generally has an insufficient hygroscopicity-improving effect, and even if an excellent hygroscopicity-improving effect is obtained, once absorbed water is not released and the fiber surface is sticky. There are many. Further, the improvement effect decreases with repeated washing, that is, most of them have poor washing durability. An object of the present invention is to provide a modified synthetic fiber having a high degree of hygroscopicity and a high degree of moisture desorption and excellent in washing durability, and a method for producing the same.

[0003]

The modified synthetic fiber of the present invention has a synthetic fiber having a hollow hole in the axial direction of the fiber and a hole connecting the hollow hole and the fiber surface, and a natural fiber arranged inside the hollow hole. It is characterized by being composed of a protein. As the synthetic fiber of the present invention, an appropriate synthetic fiber having lower hygroscopicity than natural fiber such as polyester fiber, polyamide fiber, acrylic fiber and polyolefin fiber can be used, but polyester fiber such as polyethylene terephthalate is particularly preferable.

In the present invention, hollow fibers among these synthetic fibers are used. This hollow fiber is required to have at least one hollow hole in the fiber axis direction. Such hollow fibers themselves are already known. Furthermore, in the present invention, it is necessary that the hollow holes of the hollow fiber communicate with the fiber surface. Such communication holes can be provided by a method such as reducing the hollow fibers. The weight reduction treatment is a treatment of the synthetic fiber with an agent capable of decomposing and / or dissolving at least a part of the polymer molecules constituting the synthetic fiber. Various organic or inorganic agents are used as the agent depending on the polymer, but in the case of the polyester synthetic fiber, a caustic aqueous solution is particularly preferably used. The degree of weight reduction is sufficient to form at least one communicating hole between the fiber surface and the hollow hole, and is about 5 to 30% by weight in the case of an ordinary hollow fiber.

Natural proteins to be placed in the hollow pores of the hollow synthetic fiber having pores communicating with the surface of the fiber thus obtained include gelatin, collagen, fibroin, soybean protein, casein, sericin, etc. Although a protein can be used, sericin is particularly preferable from the viewpoints of easy handling and fiber performance. These natural proteins are usually impregnated into the hollow synthetic fibers as a solution. Water is preferred as the solvent. Sericin is easy to handle because it is easily soluble in cold water and the aqueous solution does not gel.

The impregnation treatment is more preferably carried out by a method of injecting a natural protein solution into the hollow pores under reduced pressure, and then applying pressure if desired, and a method of immersing the hollow fiber in the above liquid under ultrasonic oscillation. Of course, it is also preferable to use both of the above methods in combination. After impregnation, the solvent such as water is removed by mangle treatment or heat treatment. The natural protein can be allowed to exist in the hollow pores by itself, but it is more preferable that the natural protein is allowed to undergo a water-insoluble (or hardly) solubilization treatment. Examples of such treatment include crosslinking treatment and / or water-insoluble matrix resin treatment.

[0008] The cross-linking treatment is to insolubilize the protein with a polyfunctional cross-linking agent such as aldehydes such as formalin and glutaraldehyde, and various epoxy compounds. However, it has a cross-linking function such as glycidyl ether type and water type urethane type. Those having a membrane matrix function are more preferably used. These form natural so-called hydrogels. In particular, polyethylene glycol diglycidyl ether, glycerin di- or triglycidyl ether, polyglycerin polyglycidyl ether, polypropylene glycol diglycidyl ether, diglycidyl ether such as sorbitol polyglycidyl ether, triglycidyl ether, tetraglycidyl ether, polyglycidyl ether, performance and It is preferable from the viewpoint of easy handling. When using these epoxy compounds, it is preferable to use a catalyst such as an amine together, as is well known.

The non-crosslinking type matrix resin treatment is to entrap natural protein in a water-insoluble or sparingly soluble matrix resin, and the matrix resin is an acrylic resin,
Various resin components such as urethane type may be used. It is preferable that these cross-linking agents and / or matrix resin components are usually accompanied during the impregnation of the natural protein solution. After impregnation, the liquid component is removed by mangle treatment or the like and then heated to cause a crosslinking reaction. The crosslinking reaction is preferably performed at about 100 to 200 ° C.
The amount of cross-linking and / or matrix component used can be varied over a wide range depending on its function and the like. Usually, natural protein such as sericin is 5% by weight or more of the hollow pore filling component, preferably 10 to
50 wt% is present.

The above-mentioned series of treatments can be carried out at any stage, but it is more effective to carry out at a fabric stage such as knitted fabric. Thus, a modified synthetic fiber having a high degree of hygroscopicity and a high degree of moisture release, and having a remarkably excellent washing durability can be obtained.

[0011]

Example The hygroscopicity of fibers was evaluated by the following method. 1) The weight of the fiber to be measured is measured after maintaining it in an atmosphere of 20 ° C. and 65% RH or at 40 ° C. and 90% RH for 2 hours. (Measurement value A) 2) 1 for the fiber whose weight after moisture absorption was confirmed in 1)
After treatment at 05 ° C for 2 hours and drying, the weight is measured.
(Measured value B) 3) The moisture absorption rate (%) is calculated from the following formula. Moisture absorption rate = (measured value A−measured value B) / measured value B * 100

Example 1 Sericin 30 g and glycerin polyglycidyl ether 7
5 g and 5 ml of diethylenetriamine were mixed and stirred in 1 liter of water to prepare a fiber treatment agent solution. Next, a hollow polyester fiber (polyethylene terephthalate fiber having a diameter of about 10 μm and a hollow hole diameter of about 4 μm) was subjected to a weight reduction processing of 15%. The weight-reduced hollow fiber is immersed in a bath filled with the treating agent, and at the same time, ultrasonic waves are applied to the bath.
Application of 5 Mhz was performed. The fabric thus treated was subjected to heat treatment at 150 ° C. for 1 minute after removing excess treatment liquid with mangle. After that, soda ash 0.5g / m,
It was soaped at 80 ° C for 10 minutes, washed with water and dried.

Example 2 A fiber treatment agent was prepared in the same manner as in Example 1. Example 1
The same hollow polyester fiber fabric was subjected to 15% weight reduction processing. This cloth was immersed in the above treatment liquid in a closed container, and at the same time, the inside of the container was subjected to a pressure reduction (100 mmHg) and a pressure treatment (1.6 kgf / cm ² ). The fabric thus treated was subjected to heat treatment at 150 ° C. for 1 minute after removing excess treatment liquid with mangle. In the same manner as in Example 1, the soaping was washed with water and dried.

Example 3 A fiber treating agent was prepared in the same manner as in Example 1. The same hollow polyester fiber cloth as in Example 1 was subjected to 15% weight reduction processing. This cloth was dipped in the above treatment liquid according to a usual finishing treatment and pad treatment, and after the excess treatment liquid was removed by mangle, heat treatment was carried out at 150 ° C. for 1 minute. It was washed with soaping water and dried in the same manner as in Example 1.

Comparative Example 1 (Ordinary polyester water absorption treatment) SR-1000 (Takamatsu Yushi Co., Ltd.) was adjusted to 4% owf, and an appropriate amount of acetic acid was added to adjust the pH to around 3.5. It was a liquid. The same hollow polyester fiber cloth as in Example 1 was subjected to 15% weight reduction processing. This cloth is 11
Immersion treatment was carried out at 0 ° C. for 30 minutes in a water absorbing agent (SR-1000; Takamatsu Yushi Co., Ltd.). The fabric treated in this manner was mangled to remove excess treatment liquid, then 150
Heat treatment was performed at 1 ° C. for 1 minute.

Moisture absorption performance of various water absorption processing at 20 ℃ 65%
RH was measured at 40 ° C. and 90% RH for comparison. The results are shown in Table 1, Table 2 and Table 3.

[0017]

[Table 1]

[Table 2]

[Table 3]

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[Procedure amendment]

[Submission date] June 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Moisture absorption performance of various water absorption processing at 20 ℃ 65%
RH was measured at 40 ° C. and 90% RH for comparison. The results are shown in Tables 1 and 2 .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

[0017]

Claims (9)

[Claims] 1. A hygroscopic material comprising a synthetic fiber having a hollow hole in the axial direction of the fiber and having a hole connecting the hollow hole and the fiber surface, and a natural protein disposed inside the hollow hole. Improved synthetic fiber. 2. The fiber according to claim 1, wherein the natural protein is crosslinked and insolubilized. 3. The fiber according to claim 1, wherein the natural protein is sericin. 4. The fiber according to claim 1, wherein the synthetic fiber is a polyester synthetic fiber. 5. A moisture absorbent characterized by impregnating a synthetic protein having a hollow hole in the fiber axis direction and having a hole connecting the hollow hole and the fiber surface with a natural protein solution, removing the solvent, and heat-treating the solution. To produce synthetic fibers with improved properties. 6. The method according to claim 5, wherein the natural protein solution contains a cross-linking agent. 7. The method according to claim 5, wherein the impregnation of the natural protein solution is performed under reduced pressure. 8. The method according to claim 5, wherein the impregnation with the solution of the natural protein is performed under ultrasonic oscillation. 9. The natural protein is sericin.
8. The method according to any one of 8 above.