JPH0913277A - Production of heat-insulating/high water vapor permeable waterproof fabric - Google Patents

Abstract

PURPOSE: To obtain a material suitable for sports, such as especially athletic wear, ski wear, outdoor wear, etc., always providing a body with a comfortable environment irrespective of an environmental temperature. CONSTITUTION: At least one side of a fiber substrate 5 is coated with 8-25wt.% polar organic solvent solution of a polyurethane elastomer containing 20.5-30wt.% of fine powder of wood, 30.05-10wt.% of a natural gas-containing spherical fine particle and 0.1-5wt.% of a polyisocyanate cross-linking agent, then immersed in a coagulating bath, gelatinized, washed with water and dried to form a coating film having a slight change in water vapor permeation against change of temperature of the open air and having 5-60μm thickness. Consequently a water vapor permeable waterproof fabric keeping excellent waterproofness and water resistance of the water vapor permeable and waterproof fabric, having a slight change in water vapor permeation against change of temperature of the open air, excellent in condensation preventing properties and heat insulating properties is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The product of the present invention has a constant amount of moisture permeation with respect to changes in the outside air temperature and has a high heat retention property, so that it is accompanied by intense exercise such as ski wear and outdoor wear,
The present invention relates to a moisture-permeable waterproof cloth suitable for sports clothing that requires high moisture permeability even at low temperatures such as winter.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a breathable waterproof fabric such as athletic wear, ski wear, and outdoor wear which requires high moisture permeability, a microporous film of polyurethane resin is formed on a fiber base material by a wet or dry method. The method of forming the. However, the moisture-permeable waterproof fabric as described above has a large dependency of moisture permeability on the outside air temperature, and the moisture permeability is remarkably lowered in a low temperature environment of 0 to 20 ° C., and these moisture permeability are suitable for winter sports. When the waterproof cloth is used, the moisture permeability of the microporous film is remarkably reduced, and there is a drawback that stuffiness or dew condensation occurs due to an increase in the amount of perspiration caused by exercise, and discomfort during wearing is inevitable. In order to overcome this drawback, a solution of polyurethane resin in a polar organic solvent to which proteins such as keratin have been added is applied on the fiber substrate by the wet method to form a microporous film, and the hygroscopicity of this protein A method for preventing stuffiness and dew condensation in a low temperature environment by utilizing water retention is known. However, the protein used for this is very expensive in terms of its production method and, in addition to the moisture vapor in the clothes, the new disadvantage that heat necessary for heat retention is released to the outside of the clothes due to the improved moisture permeability. occured.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks, the present invention does not impair the physical properties such as waterproofness and feeling, is a cheaper material than ever, and can be used under any external air condition. The present invention also provides a method for producing a moisture-permeable waterproof cloth having excellent moisture permeability, good dew condensation prevention properties, and good heat retention properties.

[0004]

That is, according to the present invention, 0.5 to 30% by weight of fine wood powder and 0.05% of natural gas-encapsulated spherical fine particles are provided on at least one surface of a fiber base material which has been previously subjected to water repellent treatment. 10 to 10% by weight, and 8 to 25% by weight of a polyurethane elastomer containing 0.1 to 5% by weight of a polyisocyanate cross-linking agent are applied in a polar organic solvent solution and then immersed in a coagulation bath to cause gelation. The thickness formed by subsequent washing with water and drying is 5 to 60 μm.
It is a microporous film.

The base material which is the fiber base material of the moisture-permeable waterproof cloth according to the present invention may be any of cellulosic fibers such as cotton, hemp and rayon, and synthetic fibers such as polyester, polyamide and polyolefin. ,
In addition, woven fabrics, knitted fabrics, non-woven fabrics and the like having all the structures can be used.

The coating liquid used in the present invention is a mixture of polyurethane elastomer, fine wood powder, spherical particles containing natural gas, polyisocyanate crosslinking agent and polar organic solvent. As the polyurethane elastomer, polypropylene glycol-based polyurethane, polytetramethylene glycol-based polyurethane, polyester-based polyurethane, polycarbonate-based polyurethane, etc. are used, and they have a 100% modulus of 20 to 20.
It is preferably 80 kg / cm ² . As the polar organic solvent, dimethylformamide (DMF), dimethylsulfoxide (DMSO), dimethylacetamide (DMA), tetrahydrofuran (THF), dioxane (DOX) and the like can be used, but dimethylformamide is most preferable.

The wood fine powder used in the present invention is made from waste wood and thinned wood in view of environmental problems, resource protection and cost. It has excellent properties of absorbing and releasing water according to changes in the external environment (humidity) (also referred to as the respiratory action and humidity control ability of wood), water retention, and water insolubility. Further, as the shape, fine particles having a particle diameter of 5 to 60 μm are preferable, and if the particle diameter exceeds 60 μm, spots and streaks may occur during coating processing. The amount of the fine wood powder used is 0.5 to 30% by weight, preferably 1 to 10
It is desirable to use it in a weight percentage. The amount used is 0.
If it is less than 5% by weight, sufficient performance cannot be obtained, and conversely, if it exceeds 30% by weight, the physical properties of the film are deteriorated, which is not preferable.

In the natural gas-encapsulated spherical fine particles used in the present invention, the wall material is made of vinylidene chloride-acrylonitrile copolymer and is water-insoluble. As for the shape, the particle size is 5
Fine particles of -60 μm are preferable, and if the particle size exceeds 60 μm, spots and streaks may occur during coating. The spherical fine particles are ruptured by drying and heat treatment during the manufacturing process of the moisture permeable membrane, and by forming large and small pores in the moisture permeable membrane, an air layer is obtained, and as a result, excellent heat retention and moisture retention of the moisture permeable membrane are achieved. Adiabatic effect is given. The amount of the spherical particles containing natural gas used is 0.05 to 10% by weight, preferably 0.1 to 5% by weight. If the amount used is less than 0.05% by weight, sufficient performance will not be obtained, and conversely, if it exceeds 10% by weight, the physical properties of the film will deteriorate, which is not preferable.

Examples of the polyisocyanate crosslinking agent used in the present invention include compounds having two or more isocyanate groups such as diisocyanate crosslinking agent and triisocyanate crosslinking agent. For example, 2,4- (2,6-) triisocyanate is used. Diisocyanate cross-linking agents such as diisocyanate, hexamethylene diisocyanate, 1,4-naphthalene diisocyanate, diphenylmethane-4,4-diisocyanate and isophorone diisocyanate, and tri-adducts of these diisocyanate cross-linking agents with trimethylolpropane and glycerin. It can be arbitrarily selected from isocyanate crosslinking agents and the like. The amount of these polyisocyanate crosslinking agents used is 0.1 to 5% by weight, preferably 0.2 to 2.5% by weight. If the amount used is less than 0.1% by weight, the adhesive force of the resin to the cloth will be poor, and conversely if it exceeds 5% by weight, the texture will be hardened, which is not preferable.

As the processing method of the present invention, the coating solution is applied to a floating coater, knife over roll coater or reverse roll coater on at least one side of a fiber base material which has been previously subjected to water repellent treatment and, if necessary, thermal calendar treatment. Alternatively, it is applied by a coating method using a comma coater so that the formed film has a thickness of 5 to 60 μm, and gels in warm water. Next, the cloth is washed with hot water to remove the residual solvent and dried, and then heat-treated at 160 ° C. for 1 minute using a heat setter.

[0011]

EXAMPLES Next, examples and comparative examples will be described in more detail.

Woven nylon cloth (100% nylon, warp 7
0d / 34f, weft 70d / 34f twill) was prepared, and after scouring and setting in the usual manner,
Fluorine-based water repellent Asahi Guard 710 (product of Asahi Glass Co., Ltd.) was padded with a 5% aqueous solution (squeeze ratio 35%), and 1
Heat treatment was performed at 30 ° C. for 1 minute. Next, the resin solution shown in the following formulation was applied using a knife over roll coater so that the film thickness formed was 40 μm, and then immersed in warm water for 2 minutes to gel the resin component. Then, after washing in warm water for 10 minutes and drying, 160
A heat treatment was performed at 1 ° C. for 1 minute to obtain a moisture-permeable waterproof fabric of the present invention. The obtained moisture-permeable waterproof fabric was measured and evaluated for its performance, and the results are shown in Table-1. Prescription Resamine CUS117NL 100 parts by weight (polyurethane resin, 100% modulus: 45 Kg / cm ² , product of Dainichiseika Kogyo Co., Ltd.) Wood fine powder (particle size 5 μm) 10 parts by weight Natural gas-encapsulated spherical fine particles 0.5 part by weight (Japan Philite Co., Ltd. product, particle size 60 μm) Resamine X cross-linking agent 1 part by weight (polyisocyanate cross-linking agent, Dainichiseika Chemicals Co., Ltd. product) dimethylformamide 50 parts by weight

Comparative Example For comparison with the present invention, a moisture-permeable waterproof cloth for comparison was prepared by the same method as in this example without blending the wood fine powder and the spherical particles containing natural gas used in this example. Got

The moisture permeable waterproof cloths obtained in these Examples and Comparative Examples were tested for moisture permeability, condensation, heat retention and water pressure resistance against temperature changes as follows. (1) Moisture Permeation Amount with Temperature Change According to JIS-L1099 (A-2 method), the water temperature in the moisture permeable cup is kept constant at 36 ° C. by a temperature controller,
It was placed in a thermo-hygrostat and the amount of moisture permeation was measured under the conditions of a relative humidity of 70% RH and an internal temperature of 10 ° C, 20 ° C, 30 ° C. (2) Condensation amount A cup containing hot water adjusted to 40 ° C is covered with the test cloth with the coating film side down, and it is placed in a constant temperature and humidity chamber adjusted to 20 ° C and a relative humidity of 65% RH. After being left for 10 minutes, the moisture condensed on the inside of the test cloth was absorbed by the filter paper, and the weight increase amount of the filter paper was measured. (3) Thermolab I, a precise and rapid thermophysical property measuring device, as a heat retention measuring device
IKES-F7 type (Kato Tech Co., Ltd. product) was used. The test chamber temperature is set to 20 ° C. and the heat sink temperature is set to 31 ° C. First, the amount of heat released from the heat sink in one minute is measured. Next, the test cloth is covered with a coating film surface down on a heat radiating plate, the amount of heat released through the test cloth in one minute is measured, and the heat retention rate is calculated by the formula (1). (4) Water pressure resistance It was measured according to the low water pressure method of JIS-L1092 (method A). The results are shown in Table 1.

[0015]

As described above, the moisture-permeable waterproof cloth according to the present invention has little change in moisture permeability with respect to changes in outside air temperature due to the fine wood powder in the film, and is very excellent in dew condensation prevention property. In addition, since the natural gas-encapsulating spherical fine particles in the resin liquid form large and small pores in the film, the heat retaining property is excellent. Therefore, if clothing is created using this moisture-permeable waterproof fabric, the ability to release sweat when the amount of perspiration increases from spring to autumn when the outside air temperature is high to some extent is good, and the outside air temperature is comparable. Even in the winter when the temperature is extremely low, sweat can be released to the outside and the heat retention is high. Therefore, the present invention maintains the excellent waterproofness and moisture permeability of the conventional moisture permeable waterproof fabric, and at the same time, always provides a comfortable environment for the body regardless of the environmental temperature. The moisture-permeable waterproof fabric of the present invention is a material particularly suitable for sports clothing such as athletic wear, ski wear, and outdoor wear.

[Table-1]

(Equation 1)

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an outline of a moisture-permeable waterproof fabric of the present invention.

[Explanation of symbols]

 1. Polyurethane resin 2. Fine wood powder 3. Vacancies created by spherical particles containing natural gas 4. Micropores created by wet processing of polyurethane resin 5. Fiber substrate

Claims (8)

[Claims] 1. A moisture-permeable waterproof cloth having a moisture-permeable membrane made of a synthetic polymer of a polyurethane resin on at least one side of a fiber base material, which is water-insoluble in a coating solution for forming the moisture-permeable membrane. By containing 0.5 to 30% by weight of fine wood powder having a content of 0.05 to 10% by weight of fine particles having a spherical shape and containing natural gas therein, a high moisture permeability can be obtained irrespective of changes in the outside air temperature. And a high heat retaining property, which is a method for producing a moisture-permeable waterproof fabric. 2. A wood fine powder of 0.5 to 30% by weight, natural gas-encapsulated spherical fine particles of 0.05 to 10% by weight, and a polyisocyanate crosslinking agent of 0.1 to 5% by weight on at least one side of a fiber base material. % Of polyurethane elastomer containing 8% by weight of a polar organic solvent solution, then immersed in a coagulation bath for gelation, and then washed with water and dried to a thickness of 5-60 μm. It is a microporous film, The manufacturing method of the moisture-permeable waterproof cloth of Claim 1 characterized by the above-mentioned. 3. The wood fine powder has a particle size of 5 to 60 μm made from waste wood and a thinning agent, has water insolubility, and is excellent in water absorption, moisture retention, solvent resistance and discoloration resistance. The method for producing a moisture-permeable waterproof fabric according to claim 1, wherein 4. The natural gas-encapsulated spherical fine particles are characterized in that the wall material is made of vinylidene chloride-acrylonitrile copolymer, and has a particle size of 5 to 60 μm in which isobutane gas is included, and is water-insoluble. To do
The method for producing a moisture-permeable waterproof fabric according to claim 1. 5. A change in the amount of moisture permeation with respect to a change in the outside air temperature of 0 to 40 ° C. is 8000 to 12 under constant humidity conditions.
It is 000g / m < ² > / 24hrs, The manufacturing method of the moisture-permeable waterproof cloth of Claim 1 characterized by the above-mentioned. 6. The anti-condensation property is excellent, and the amount of dew condensation is 1 g / under an environmental condition of 20 ° C. and relative humidity of 65% RH.
characterized in that m is 2 ^/ 24hrs or less, the production method of vapor-permeable waterproof fabric of claim 1 wherein. 7. The heat retention is excellent and the heat retention rate is 20%.
It is above, The manufacturing method of the moisture-permeable waterproof cloth of Claim 1 characterized by the above-mentioned. 8. The method for producing a moisture-permeable waterproof fabric according to claim 1, wherein the water pressure resistance is 500 to 2000 mmH ₂ O.