JPH06116816A - Water-repellent and hygroscopic fiber - Google Patents

Abstract

PURPOSE:To obtain new conjugate fiber having both excellent water repellency and water vapor absorbing ability. CONSTITUTION:Water-repellent and hygroscopic fiber comprises a sheath-core structure composed of a core component consisting of 100 pts.wt. acrylonitrile- based polymer (1) and 10-300 pts.wt. collagen powder having 10mum or smaller average particle diameter and a sheath component consisting of a polymer (2) having 90 deg. or larger contact angle with water when made into a cast film, having 0.1-20mum thickness of sheath part, 80 point or higher water repellency and 5wt.% higher equilibrium water content.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel composite fiber which is excellent in water repellency and has the ability to absorb water vapor.

[0002]

2. Description of the Related Art One of the major purposes of clothing is to protect the skin from the outside world, and typically it can be said that protecting it from water drops such as rain is a very elementary function. Therefore, conventionally, various water-repellent fibers and water-repellent treatment techniques have been developed using various fluorine-containing polymers, silicones, urethane polymers and the like.

On the other hand, the comfort of clothing should always be pursued, and the ability to absorb water vapor generated by the sweating action from the skin is a function primarily required for clothing fibers. It is generally considered that such water repellency and water absorption are completely opposite functions, and it has been considered impossible to produce such fibers.

Therefore, conventionally, a method of achieving both purposes by weaving a water-absorbent fiber and a water-repellent fiber together has been studied.

However, the purpose has not been sufficiently achieved by such a method, and the advent of a fiber which has a contradictory function with one fiber is desired.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fiber that simultaneously satisfies two contradictory functions of water absorption and water repellency.

[0007]

The gist of the present invention is that 100 parts by weight of an acrylonitrile polymer (1) and collagen powders 10 to 300 having an average particle size of 10 μm or less are used.
A core component composed of parts by weight and a sheath component composed of the polymer (2) having a contact angle with water of 90 ° or more when formed into a cast film, and the thickness of the sheath portion is 0.1 to 20 μm.
A water-repellent and moisture-absorbent fiber having a core-sheath structure having a water repellency of 80 points or more and an equilibrium moisture content of 5% by weight or more.

In the present invention, the core component imparts hygroscopicity to the fiber, and its purpose is 100 parts by weight of the acrylonitrile polymer (1) and an average particle size of 10 μm.
Achieved by using a composition consisting of 10 to 300 parts by weight of collagen powder below,
If it is less than 0 parts by weight, sufficient hygroscopicity cannot be exhibited, which is not preferable.

Further, the average particle size of the collagen powder used is required to be 10 μ or less, and if it exceeds 10 μ, the spinnability such as nozzle clogging during spinning is deteriorated, which is not preferable.

The acrylonitrile polymer (1) used in the present invention is not particularly limited, and various known (co) polymers can be used and may be arbitrarily selected according to the purpose. .

Specific examples of the acrylonitrile polymer (1) include polyacrylonitrile, acrylonitrile and vinyl acetate, vinylidene chloride, acrylamide, methyl methacrylate, acrylic acid, methyl acrylate, vinyl bromide, sodium methacryl sulfonate, etc. Copolymers of

The sheath component imparts water repellency to the fiber of the present invention and is composed of the polymer (2) having a contact angle with water of 90 ° or more when formed into a cast film.

The polymer (2) used in the present invention is not particularly limited as long as it satisfies the above conditions. Specific examples include, for example, acrylonitrile and a copolymer with a vinyl monomer (comonomer A) that is copolymerizable with acrylonitrile and has a fluorine content of 30% by weight or more.

When the above acrylonitrile copolymer is used, from the viewpoint of water repellency and spinnability, it is copolymerizable with 70 to 95% by weight of acrylonitrile and 5 to 30% by weight of acrylonitrile and has a fluorine content. Is 30% by weight
A copolymer with the above vinyl-based monomer (comonomer A) is preferable.

Further, the fiber made of the copolymer can be generally produced by a wet spinning method or a dry wet spinning method, and a hygroscopic fiber which is an object of the present invention as described later is obtained. Suitable for obtaining the required fiber structure.

Examples of the comonomer A used in the present invention include trifluoromethyl (meth) acrylic acid, octafluorobutyl (meth) acrylic acid and heptadecafluorodecyl (meth) acrylic acid.

In the present invention, other vinyl type monomers may be used in combination, if necessary, within a range not departing from the object of the present invention.

The fiber of the present invention is composed of the above-mentioned two kinds of polymers of the core component and the sheath component, and is a bilayer composite fiber having a core-sheath in a cross section perpendicular to the length direction. What is more necessary is that the sheath has a thickness of 0.1 to 20 μm.
Is to

If the thickness of the sheath is less than 0.1 μm, the desired water repellency cannot be obtained, and if it exceeds 20 μm, the water absorption performance is deteriorated, which is not preferable.

Further, in the present invention, the water repellency of the obtained fiber is 80 points or more, and the equilibrium moisture content is 5% by weight or more in terms of comfort of clothing.

The method for producing the fiber of the present invention is not particularly limited, and the wet, dry-wet and dry spinning methods generally used for producing acrylonitrile fibers can be used. It can be arbitrarily selected according to the purpose.

As the solvent used, those commonly used for acrylonitrile-based polymers can be used,
Examples thereof include dimethylacetamide, dimethylformamide, dimethylsulfoxide, γ-butyrolactone, ethylene carbonate, sodium thiocyanate nitrate, and an aqueous zinc chloride solution.

Since the fiber of the present invention is a novel composite fiber which is excellent in water repellency and has the ability to absorb water vapor, it has a wide range of uses such as general clothing, sports clothing, interior materials, building materials such as partitions. Is possible.

The present invention will be specifically described below with reference to examples.

[0025]

[Examples] In the following examples, "water repellency" and "equilibrium moisture content" were measured according to JIS L1092 and JIS L1092, respectively.
It was evaluated by 1013.

(Example 1) Acrylonitrile copolymer (1) 1 comprising 97% by weight of acrylonitrile, 2% by weight of acrylamide and 1% by weight of methyl methacrylate.
A polymer comprising 22 parts by weight of a dimethylacetamide dispersion of a composition comprising 00 parts by weight and 45 parts by weight of a collagen powder having an average particle size of 7μ as a core component, and comprising 90% by weight of acrylonitrile and 10% by weight of heptadecafluorodecylmethacrylic acid. Using the 20% by weight dimethylacetamide solution of (2) for the sheath component, the core-sheath composite spinneret was passed through the core-sheath composite spinneret so that the weight ratio of the core component and the sheath component was 5/1.
Wet spinning in a coagulation bath consisting of dimethylacetamide and water of 70/30 (weight ratio) at 0 ° C., washing in boiling water and stretching 5 times, and then drying with a drying roller at 120 ° C. The fibers shown below were produced by performing a fixed length heat treatment with a heating roller at 200 ° C.

Fineness 36 μ Sheath thickness 1.0 to 2.5 μ Water repellency 90 points Equilibrium moisture content 5.2 wt% (Example 2) Acrylonitrile-based common weight consisting of 91 wt% acrylonitrile and 9 wt% vinyl acetate Coalescing (1)
100 parts by weight and collagen powder 100 with an average particle size of 7μ
A 28% by weight dimethylacetamide dispersion of a composition consisting of 1 part by weight was used as a core component, and the same sheath component solution as in Example 1 was used, and the weight ratio of the core component and the sheath component was 3 in terms of solid content.
The fiber shown below was produced by spinning in the same manner as in Example 1 so that the ratio was / 1.

Fineness 36μ Sheath thickness 2.0 to 3.5μ Water repellency 100 points Equilibrium moisture content 5.9% by weight (Example 3) Core component dispersion and sheath component solution similar to Example 1 Was used so that the weight ratio of the core component and the sheath component was 3/1 in terms of solid content, and spinning was performed in the same manner as in Example 1 to produce the fibers shown below.

Fineness 22μ Sheath thickness 1.0 to 2.5μ Water repellency 90 points Equilibrium moisture content 10.9% by weight (Comparative Example 1) Same as Example 1 except that collagen powder having an average particle size of 20μ is used. Spinning was carried out, but nozzle clogging occurred and stable spinning was impossible.

Comparative Example 2 91% by weight of acrylonitrile
And 25% by weight dimethylacetamide dispersion of a composition comprising 100 parts by weight of an acrylonitrile-based copolymer (1) consisting of 9% by weight of vinyl acetate and 5 parts by weight of collagen powder having an average particle size of 7μ was used as a core component. Using the same sheath component solution as in 1, the weight ratio of the core component and the sheath component was 3/1 in terms of solid content, and the ratio of dimethylacetamide to water at 50 ° C. was passed through the core-sheath composite spinneret. 70/3
By wet spinning in a coagulation bath consisting of 0 (weight ratio), washing in boiling water and stretching 7 times, then drying with a drying roller at 120 ° C., and then subjecting to a fixed length heat treatment with a heating roller at 200 ° C. , A fiber with a fineness of 24μ was obtained,
The official moisture regain was as low as 3% by weight.

Comparative Example 3 A fiber was produced in the same manner as in Example 1 except that the weight ratio of the core component and the sheath component was 50/1 in terms of solid content, and a fiber having the following characteristics was obtained.

Fineness 18μ Sheath thickness 0.05 to 0.07μ Water repellency 40 points Equilibrium moisture content 5.5% by weight

[0033]

As described in detail above, the fiber of the present invention is
Since it is a new composite fiber that has excellent water repellency and also has the ability to absorb water vapor, it can be used for a wide range of applications such as general clothing, sports clothing, interior materials, building materials such as partitions, etc. Is large.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shoji Hayashi, 20-1 Miyuki-cho, Otake-shi, Hiroshima Prefecture, Central Research Laboratory, Mitsubishi Rayon Co., Ltd. (72) Inventor, Gen Ito 4-chome, Sunadabashi, Higashi-ku, Nagoya, Aichi Issue Mitsubishi Rayon Co., Ltd. Product Development Laboratory

Claims (3)

[Claims] 1. An acrylonitrile polymer (1) 100
10 parts by weight and collagen powder having an average particle size of 10 μ or less
˜300 parts by weight of a core component, and a sheath component made of a polymer (2) having a contact angle with water of 90 ° or more when formed into a cast film, and the thickness of the sheath part is 0.1 to
A water-repellent and hygroscopic fiber having a core-sheath structure, which has a water content of 20μ, a water repellency of 80 or more, and an equilibrium moisture content of 5% by weight or more. 2. The polymer (2) is acrylonitrile 70.
~ 95% by weight and copolymerizable with acrylonitrile,
The water-repellent and hygroscopic fiber according to claim 1, which is a copolymer composed of 5 to 30% by weight of a vinyl-based monomer (comonomer A) having a fluorine content of 30% by weight or more. 3. The comonomer A is at least one selected from trifluoromethyl (meth) acrylic acid, octafluorobutyl (meth) acrylic acid and heptadecafluorodecyl (meth) acrylic acid. The water-repellent and moisture-absorbent fiber according to 2.