JPH09176969A - Hollow fiber containing natural polysaccharide and method for producing the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a hollow fiber in which various functions are sufficiently exhibited and the durability is remarkably improved, and a method for producing the hollow fiber. SOLUTION: The hollow portion of the hollow fiber, in which the communicating holes to the hollow portion are scattered on the fiber surface, is filled with the heated and dissolved natural polysaccharide by suction through the communicating hole, and then cooled to gel. A natural polysaccharide is included in the hollow portion.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hollow fiber containing a natural polysaccharide in a hollow portion and a method for producing the hollow fiber. More specifically, the hollow fiber is filled with a function-imparting agent. Thus, the present invention relates to a hollow fiber which can impart various functions to the fiber and is excellent in durability of the function, and a method for producing the hollow fiber.

[0002]

2. Description of the Related Art Heretofore, there have been some proposals for a fiber in which a functional substance is attached to the hollow portion of a hollow fiber having a through hole and / or a connecting hole from the surface of the fiber to the hollow portion.

For example, in JP-A-5-171571, the core / sheath composite fiber is alkali-reduced and the core part is dissolved and removed to form a hollow fiber having a through hole from the fiber surface to the hollow part. A hollow fiber having an antistatic property has been proposed in which an antistatic agent is attached to the hollow portion of the hollow fiber.

However, in such a method, if the core portion is completely dissolved and removed, the physical properties such as the strength of the fiber are deteriorated, which is apt to be a practical problem, and if the core portion is left, the formation of the through holes is insufficient. In addition, the adhesion of the antistatic agent becomes insufficient, and even if it adheres, there is a problem in durability.
When dyed, there was a problem that quality problems such as the meridian tend to occur.

Furthermore, Japanese Patent Laid-Open No. 5-339878,
In JP-A-6-17372 and JP-A-6-17373, a natural protein is impregnated into the hollow pores of a hollow synthetic fiber having a communicating hole to the hollow portion on the fiber surface, crosslinked and insolubilized to endure moisture absorption. There are also examples of improved sexuality.

However, the natural protein solution generally has a high viscosity, and it is extremely difficult to pass through the communication holes to impregnate or fill the hollow interior. Further, when the natural protein is impregnated at a low concentration that is easy to fill in the hollow, the amount of the natural protein contained in the hollow portion becomes small, so that the level of the expressed function becomes insufficient. is there.

[0007]

The object of the present invention is to provide a sufficient amount of natural polysaccharides capable of sufficiently exhibiting various functions by encapsulating the natural polysaccharides in the hollow portion of the hollow fiber having fine communication holes. And a method for producing the hollow fiber, in which the durability is remarkably improved.

[0008]

Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventors have found that in the hollow portion of a hollow fiber in which communication holes to the hollow portion are scattered on the fiber surface, a natural poly- After filling with sugar, when cooling and gelling,
It was determined that the desired hollow fiber was obtained.

Thus, according to the present invention, there is provided a hollow fiber in which communication holes from the surface of the fiber to the hollow portion are scattered, and a natural polysaccharide characterized in that the natural polysaccharide is present in the hollow portion of the hollow fiber. Hollow fiber containing a polysaccharide, and the hollow portion of the hollow fiber in which the communication holes to the hollow portion are scattered on the fiber surface, the natural polysaccharide that has been heated and dissolved is suction-filled through the communication hole, and then cooled. There is provided a method for producing a hollow fiber encapsulating a natural polysaccharide, which is characterized in that it is gelled.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The hollow fiber of the present invention means a hollow fiber composed of a chemical fiber such as rayon or acetate, or a synthetic fiber such as polyester or nylon, and a polyester hollow fiber is preferably exemplified.

The hollow fiber can be used in any form such as filament yarn, spun yarn, crimped yarn and the like.

The polyester fiber referred to herein is mainly composed of terephthalic acid as a dicarboxylic acid component and contains at least one glycol, preferably ethylene glycol.
At least 1 selected from trimethylene glycol
For example, a polyester containing a seed alkylene glycol as a main glycol component.

The polyester fiber contains a stabilizer, an antioxidant, a flame retardant, an antistatic agent, a fluorescent whitening agent, a catalyst, an anti-coloring agent, a heat-resistant agent, a coloring agent, inorganic particles and the like, if necessary. May be.

As a method for producing the hollow fiber, a method for producing the hollow fiber by devising the shape of the spinneret (Executive Examination 2
As a hollow fiber having a communication hole, there is a method of dissolving or decomposing a polymer in a core to obtain a hollow fiber having a communication hole (JP-A-5-1715).
No. 71, etc.) or by mixing the ordinary polyester with a polyester copolymerized with an organic sulfonic acid compound and melt-spinning the polyester hollow fiber to reduce the alkali, thereby removing the polyester copolymerized with the organic sulfonic acid compound. There is a method of forming communication holes from the fiber surface to the hollow portion (Japanese Patent Laid-Open No. 1-20319, etc.).

The communicating hole preferably has a width of 0.2 to 10 μm and a length of 5 to 20 μm. When the width and the length of the communication hole are out of the above ranges, the natural polysaccharide may be insufficiently filled, or even if filled, the natural polysaccharide may be easily dropped.

The following method can be exemplified as a method for filling the hollow with the natural polysaccharide.

A method of gelling the natural polysaccharides in the hollow fibers by immersing the hollow fibers in a solution of a natural polysaccharide dissolved in a solvent, replacing the air in the hollow fibers with the solution of the natural polysaccharides, and then cooling. .

After immersing the hollow fiber in a solution of a natural polysaccharide dissolved in a solvent, the air in the hollow fiber is replaced with the natural polysaccharide solution by squeezing with a mangle or the like, and then cooled to cool the natural fiber in the hollow fiber. A method of gelling sugars.

Air is removed by depressurizing the hollow fibers in a closed container, and then a natural polysaccharide solution dissolved in a solvent is poured into the containers to fill the inside of the hollow fibers, and then the treated hollow fiber structure is A method of gelling the natural polysaccharides in the hollow fibers by taking out and cooling. And so on.

The natural polysaccharides used in the present invention means naturally occurring polymer materials obtained by dehydration condensation of monosaccharides by glycoside bonds, such as cellulose, starch, glycogen and agar, and solvent. A material that is difficult to dissolve in a solvent or the like is used after it is dissolved by heating and then cooled and once gelled.

Of these, agar and starch are preferable examples. Here, the agar is a kind of hemicellulose contained in the cell membrane of agar beetle, which is freeze-dried so-called "tokoroten" which is dried agar beetle, extracted with hot water, and cooled and solidified.

Agar is easy to obtain, and as can be seen from the fact that it is used for food processing and microbial medium,
It is a very safe gel former.

The starch is obtained from potato, corn, rice, sweet potato, warabi or tapioca. Starch obtained from sweet potato, corn or kudzu is preferably exemplified. .

The starch is widely known as a material for warabi-mochi, kudzu-mochi, kashiwa-mochi, etc., and is a very safe gel-forming product in addition to being easily available.

In the present invention, the above-mentioned natural polysaccharide is used by dissolving it in a solvent, and the solvent is not particularly limited as long as it dissolves the natural polysaccharide, but water is preferably used because it is easy to handle.

Usually, with respect to 1 liter of water, about 100 to 200 g of starch and 20 g of agar are used.
It is heated and dissolved depending on the degree, but the concentration may be changed depending on the purpose.

Further, various function-imparting substances may be mixed with the above-mentioned natural polysaccharides. For example, antibacterial agent,
Deodorant, ultraviolet absorber, insect repellent, hygroscopic agent, heat retaining agent, moisturizing agent or those having a medicinal effect when applied to the skin are mixed with natural polysaccharides, and by filling the hollow portion of the hollow fiber, It becomes possible to impart these functions to the hollow fiber.

The higher the filling rate of the natural polysaccharide in the hollow portion, the better. However, the void occupancy rate must be 10% or more, and 30% or more is more preferable from the viewpoint of function expression.

[0029]

The present invention will be described in more detail with reference to the following examples. The physical properties in the examples were measured by the following methods.

(1) Hygroscopicity The sample was pre-dried at 50 ° C. for 2 hours, conditioned at 20 ° C. for 3 days and then dried at 105 ° C. for 2 hours, and its weight W0
Was measured.

Next, the sample was placed in a desiccator adjusted to 20 ° C. and 90% RH to adjust the humidity for 3 days and then the weight W1 thereof was measured, and the moisture absorption rate (%) was calculated by the following formula.

[0032]

Moisture absorption rate (%) = ((W ₁ −W ₀ ) / W ₀ ) × 100

[Example 1] Polyethylene terephthalate having an intrinsic viscosity of 0.61 and a titanium oxide content of 0.3% by weight was melted and a hollow fiber was used to form a hollow fiber undrawn yarn having a hollowness of 40%. Got

Next, this undrawn yarn was drawn to obtain a hollow hollow multifilament yarn of 50 denier / 20 filaments.

Tricots were prepared, refined and preset according to a conventional method. The obtained cloth is sodium hydroxide 5
The treatment was carried out in hot water (105 ° C.) of 0 g / l for a short time (10 minutes) to obtain a weight loss rate of 20%.

The multifilament yarn was taken out from the obtained knitted fabric, and its surface was observed by an electron microscope. As a result, the width was 0.2 to 2.0 μm and the length was 10 per 100 μm in the fiber axis direction.
At least one micro-groove of ˜150 μm was observed.

Separately, agar made by Shinano Agar Agricultural Cooperative 1.
300 cc of water was added to 5 g and heated to dissolve the agar.

To this clear liquid of agar was added 15 g of Tundle DC-87 (manufactured by Yamato Chemical Co., Ltd.) containing a moisturizing component to prepare a working liquid.

The obtained working liquid was put in a pot of a color pet dyeing machine, the tricot knitted fabric after the weight reduction obtained above was loaded in a sample holder, and the dipping treatment was carried out at 95 ° C. for 30 minutes.

Next, for the purpose of removing an excessive amount of the treatment liquid adhering to the surface of the knitted fabric, light washing with warm water is carried out,
Then, it was cooled to room temperature.

Further, the knitted fabric was dried at 120 ° C. for 1 minute and further heat-treated at 160 ° C. for 1 minute.

The hollow portion of the fibers constituting the obtained knitted fabric was filled with a gel-like substance composed of agar and a moisturizing component, and this knitted fabric exhibited high hydrophilicity, and the moisture absorption was measured to be 6 It was 0.6%.

Further, this cloth was excellent in washing durability, and the moisture absorption rate was maintained at 6.3% even after 20 times of washing.

[Comparative Example 1] In Example 1, without using agar, Tundle DC-87 in 300 cc of water was used.
The same procedure as in Example 1 was carried out except that 15 g of only the solution was dissolved in the solution to prepare a solution.

The knitted fabric obtained had a moisture absorption rate of 6.0%, but after repeated washing 20 times, the moisture absorption rate decreased to 0.7% and the moisture absorption effect was not durable.

Example 2 In Example 1, instead of the agar solution, a starch solution prepared by heating and dissolving 720 cc of water in 180 g of warabi-mochi flour (sweet potato starch) manufactured by Hashimoto Food Industry Co., Ltd. was used. The same procedure as in Example 1 was carried out except that the amount of tandol DC-87 added to the solution was 90 g.

The hollow part of the fibers constituting the obtained knitted fabric is filled with a gel-like substance composed of starch and a moisturizing component, and this knitted fabric exhibits high hydrophilicity, and its moisture absorption rate is measured to be 6 It was 0.3%.

Further, this cloth was excellent in washing durability, and the moisture absorption rate was maintained at 6.2% even after 20 times of washing.

Example 3 In Example 2, cornstarch 100 was prepared in 1 liter of water without using starch.
g and tandol DC-87 was dissolved in 90 g to prepare a treatment liquid, and the treatment was performed in the same manner as in Example 2 except that the treatment liquid was used.

The hollow portion of the fibers constituting the obtained knitted fabric was filled with a gel-like substance composed of starch and a moisturizing component, and this knitted fabric exhibited high hydrophilicity, and the moisture absorption was measured to be 5 It was 0.8%.

Further, this cloth was excellent in washing durability, and the moisture absorption rate was maintained at 5.5% even after 20 times of washing.

[Comparative Example 2] In Example 2, Tandle DC-87 in 1 liter of water was used without using starch.
The same procedure as in Example 2 was carried out except that 90 g of the solution was dissolved in the solution to prepare a solution.

The obtained knitted fabric had a moisture absorption rate of 5.6%, but after repeated washing 20 times, the moisture absorption rate decreased to 0.8% and the moisture absorption effect was not durable.

[Comparative Example 3] In Example 2, 20 g of gelatin powder (manufactured by Miyagi Chemical Industry Co., Ltd., trade name Zerais) and 90 g of Tandol DC-87 were dissolved in 1 liter of water without using starch. The same procedure as in Example 2 was carried out except that a treatment liquid was prepared and subjected to treatment.

In the obtained knitted fabric, during the heat treatment at 160 ° C., gelatin was eluted from the hollow portion of the hollow fiber,
It was not possible to impart hygroscopicity.

Claims (5)

[Claims] 1. A hollow fiber in which communication holes from the surface of the fiber to the hollow portion are scattered, and the natural polysaccharide is characterized in that the natural polysaccharide is present in the hollow portion of the hollow fiber. Hollow fiber. 2. The hollow fiber containing the natural polysaccharide according to claim 1, wherein the natural polysaccharide is agar. 3. A hollow fiber containing a natural polysaccharide according to claim 1, wherein the natural polysaccharide is starch. 4. The hollow fiber containing a natural polysaccharide according to claim 1, wherein the communication hole has a width of 0.2 to 10 μm and a length of 5 to 20 μm. 5. A natural polysaccharide that has been heated and dissolved is suction-filled into the hollow portion of the hollow fiber, in which the communicating holes to the hollow portion are scattered on the fiber surface, through the communicating hole, and then cooled to gel. A method for producing a hollow fiber containing a natural polysaccharide, which comprises: