JPH05222679A - Moisture-permeable waterproof cloth - Google Patents

Abstract

PURPOSE:To provide a moisture-permeable waterproof cloth having excellent sweat-absorptivity, moisture-condensation preventing property and feeling to the skin while keeping the strength and feeling of the base cloth. CONSTITUTION:The objective moisture-permeable waterproof cloth is produced by laminating a microporous or non-porous moisture-permeable resin layer on a fiber substrate and laminating a microporous or non-porous moisture- passing resin layer containing collagen to the above resin layer at a coating rate of 0.5-50g/m<2> in terms of solid content.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathable waterproof cloth excellent in sweat absorption, dew condensation prevention, and texture, which is particularly suitable for use in not only rainwear but also sportswear such as windbreakers and ski wear or tents.

[0002]

2. Description of the Related Art Hitherto, there has been known a moisture-permeable waterproof cloth having a microporous or non-porous film laminated by a coating method or a laminating method. However, the moisture-permeable resin layer alone has poor water absorption, has a stuffiness, and cannot be said to have a sufficient dew condensation preventing function.

[0003]

The object of the present invention is strength,
An object of the present invention is to provide a moisture-permeable waterproof cloth excellent in sweat absorption, dew condensation prevention, and touch without impairing texture.

[0004]

According to the present invention, a microporous or non-porous moisture permeable resin layer is laminated on a fiber base material, and further 0.5 to 50 g / solid content of collagen is added as a solid component. m ²
The present invention relates to a moisture-permeable waterproof cloth characterized by laminating microporous or non-porous moisture-permeable resin layers.

The present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views of a moisture-permeable waterproof cloth corresponding to claim 1 of the present invention, 1 is a fiber substrate, 2 is a microporous moisture-permeable resin layer, 3 is collagen, and 4 is non-porous moisture-permeable. A resin layer is shown.

FIG. 3 is a cross-sectional view of a moisture-permeable waterproof cloth corresponding to claim 2 of the present invention, in which 1 to 3 are the same as above, 5 is a moisture-permeable foam layer, and 6 is a closed cell.

4 to 6 are cross-sectional views of the fabrics of Comparative Examples 1 to 3, and the same symbols have the same meaning.

In the present invention, examples of the fiber base material include natural fibers such as cotton, synthetic fibers such as polyamide and polyester, and inorganic fibers such as glass fibers, woven fabrics, non-woven fabrics and knitted fabrics. There is no limitation.

In the present invention, the microporous moisture-permeable resin layer has a communicating hole, and the resin forming the resin layer is a polyurethane type, polyamino acid type, polyacrylic type, polyamide type, polyvinylidene chloride type, Examples thereof include polyester type, polyvinyl acetate type, polyvinyl alcohol type and the like. Polyurethane type, polyamino acid type and polyacrylic type are particularly preferable. As a method of forming a microporous moisture-permeable resin layer, an organic solvent solution of a polymer of the above resin is applied,
After that, a method of immersing in water to make a hole by a wet coagulation method, a method of eluting a film obtained by adding a soluble substance such as gelatin or a polymeric hygroscopic agent to the above resin in hot water or hot water, an organic solvent solution of a polymer of the above resin A method in which an emulsion in which water is dispersed is applied to a fiber base material and then dried and a hole is formed by a dry method in which these solvents and water are sequentially evaporated is adopted, but is not particularly limited. .. The microporous pore size obtained by the above method is preferably in the range of about 1 to 5 μm.

In the present invention, the resin forming the non-porous moisture-permeable resin layer is not particularly limited as long as it is a moisture-permeable resin which is difficult to swell in water and has a film forming ability, and the above-mentioned microporous moisture-permeable resin can be used. The same resin as the resin forming the resin layer can be used. As the method for forming the non-porous moisture-permeable resin layer, a solution of the above resin on the fiber base material, a method of coating emulsion, etc., a method of simultaneously laminating a thermoplastic resin or a method in which the resin is preliminarily formed into a film. A method for laminating them may be mentioned.

The moisture-permeable waterproof fabric of the present invention is obtained by laminating the above-mentioned microporous or non-porous moisture-permeable resin layer on a fiber base material, and further by depositing collagen on the microporous or non-porous layer. It is obtained by laminating a moisture permeable resin layer.

In the present invention, collagen is a natural protein fiber existing in the skins of pigs and cows, and may be a commercially available powder. For example, "Triazet" by Showa Denko, ""Fiblaster" and the like. The particle size of the collagen powder is preferably 10 μm or less.

Sweat absorbency by adding collagen,
Although the anti-condensation property is improved, when the amount of addition is increased in order to improve the effect, the drape property as a clothing tends to be lacking or the brittleness tends to be obtained. In the present invention, the basis weight is the solid content
0.5 to 50 g / m ² , preferably 1 to 20 g / m ² , with the outermost layer being thinly laminated without impairing drape or texture, and is extremely effective in moisture permeability, sweat absorption, and dew condensation prevention. ..
If it is less than 0.5 g / m ² , there is no effect, and if it exceeds 50 g / m ² , the drape property and texture are impaired. 100% resin solid
1 part to 100 parts is preferable per part, and less than 1 part is not effective, and if it exceeds 100 parts, the performance is good but the adhesion to the lower layer and the workability are deteriorated. It is more preferably 10 to 50 parts. Further, since the effect is further enhanced even when it is added to the lower layer, it may be added in a small amount as long as the drape property and the strength are not impaired.

In the present invention, the microporous or non-porous moisture permeable resin layer may be a foam layer having closed cells.

In the present invention, the resin used for the microporous moisture-permeable foam layer is a polyurethane type, polyamino acid type, polyacrylic type, polyamide type, polyvinylidene chloride type, polyester type, polyvinyl acetate type, polyvinyl alcohol type. And so on. Especially polyurethane type,
Polyamino acid type and polyacrylic type are preferable. As a method of forming closed cells in the microporous moisture-permeable resin layer, for example, a method of forming air bubbles by mixing air by mechanical stirring,
Examples thereof include a method of foaming by a gas generated during a chemical reaction, a method of pressurizing a liquefied gas, a method of using a foaming agent such as a thermal decomposition type or thermally expandable microcapsule, and the like. The method for forming the foam layer is not limited to the above method, but among the above, the heat-expandable microcapsules are particularly dispersed, and water is dispersed in the organic solvent solution of the polymer of the resin forming the microporous moisture-permeable foam layer. The most preferable method is to uniformly mix the resulting emulsion, apply the obtained compound, and heat-foam to form. By this method, the microporous foam layer is formed by heat-foaming the heat-expandable microcapsules in which the vaporizable liquid is embedded in the thermoplastic resin film in the microporous film.

As the resin forming the non-porous moisture-permeable resin foam layer, the same resin as the above-mentioned resin forming the non-porous moisture-permeable resin layer can be used. As a method for forming a non-porous moisture-permeable resin foam layer, for example, a method of foaming by mechanical stirring, a method of foaming by a gas generated during a chemical reaction, a method of pressurizing a liquefied gas, a low boiling point volatilization Examples of the method include a method of mixing or impregnating a solvent with a solvent and vaporizing it, and a method of using a foaming agent such as a pyrolytic type or a heat-expandable microcapsule. The method for forming the foamed layer is not limited to the above method, but among them, the heat-expandable microcapsules, in particular, are uniformly mixed in the organic solvent solution of the polymer of the moisture-permeable resin, and the resulting compound is applied. The most preferable method is by foaming by heating. By this method, the non-porous moisture-permeable resin foam layer is formed by heat-foaming in the non-porous moisture-permeable resin layer by heat-expandable microcapsules obtained by embedding a vaporizable liquid in a thermoplastic resin film. It

The closed cells in the present invention need only be substantially closed cells, and include completely closed cells and foams having a high closed cell rate. By foaming and having closed cells, heat retention is improved and the touch is also improved.

The heat-expandable microcapsules used in the present invention are microspheres containing a vaporizable liquid embedded in a thermoplastic resin film, and when heated to an appropriate temperature, the liquid embedded therein vaporizes. The pressure causes the entire capsule to expand, giving a foam body with an expanded volume (hereinafter abbreviated as “foaming”).
As the thermoplastic resin constituting the microcapsules, those having a softening point of 50 to 200 ° C. are preferable, and as this type of resin, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polymethyl acrylate,
Examples thereof include homopolymers such as polymethylmethacrylate and polyvinyl acetate, and copolymers thereof.

As the vaporizable liquid to be embedded, an inexpensive lower hydrocarbon, such as liquid butane, which can be easily microencapsulated and is inexpensive, is suitable. The particle size of the microcapsules before foaming is preferably 5 to 30 μm, and has the property of foaming several times to several tens of times when heated at 50 to 200 ° C. for several minutes.

The mixing ratio of the heat-expandable microcapsules and the resin forming the microporous foam layer or the moisture-permeable resin foam layer is 2 microcapsules per 100 parts by weight of the resin solid content in the emulsion. A range of up to 100 parts by weight is preferred. If it is less than 2 parts by weight, it will not be particularly soft after foaming.
This is because if the amount is more than parts by weight, the strength of the foam layer will be weak, the adhesion to the substrate will be poor, and the moisture permeability will be impaired, which is not preferable. Further, 5 to 50 parts by weight is particularly preferable. When mixing the heat-expandable microcapsules, it is important to use a suitable method such as a dissolver, homodisper, or paint roll to uniformly mix and disperse.

[0021]

EXAMPLES Examples of the present invention will be described below.
Incidentally, “parts” means “parts by weight”.

EXAMPLE 1 Nylon taffeta was used as the fiber base material, and 100 parts of urethane resin emulsion (trade name "Himlen X-3038", manufactured by Dainichiseika Co., Ltd.), 13 parts of MEK, 17 parts of toluene and 50 parts of water were used as the base material.
Part, 5 parts of MEK, 2 parts of a cross-linking agent (trade name "Resamine X", manufactured by Dainichiseika Co., Ltd.), and a water repellent (trade name "Resamine UM"
-317 ", manufactured by Dainichiseika Co., Ltd.) After uniformly mixing 2 parts, 200 g / m ^{2 was} applied with a knife coater, dried at 80 ° C for 2 minutes, and further dried at 130 ° C for 2 minutes to give a fine porosity. After forming a film, 20 parts of collagen (trade name "Triazet", manufactured by Showa Denko) evenly mixed with the same resin was applied with a knife coater at a solid content of 15 g / m ² and then at 80 ° C for 1
Min, and further dried at 130 ° C. for 1 minute to obtain a moisture-permeable waterproof fabric.

Example 2 Nylon taffeta was used as the fiber base material, polyethylene glycol and isophorone diisocyanate were heat-polymerized on the base material by a conventional method, and the resulting polymer was dissolved in a toluene-isopropanol mixed solvent to prepare 100 g of this solution. / M ² application,
After drying at 50 ° C. for 2 minutes and further at 100 ° C. for 2 minutes, collagen (triazet) (30 parts) was added to 100 parts of the urethane resin solution, and the mixture was uniformly mixed to obtain a solid content of 5 g / m ^{2 was} applied and dried at 50 ° C. for 1 minute and 100 ° C. for 1 minute to obtain a moisture permeable fabric.

Example 3 Polyester / Kotton = 70/30 was used as the fiber base material, and urethane resin emulsion (Heimren X-3040) was formed on the fiber base material.
100 parts, MEK 13 parts, toluene 18 parts, crosslinking agent (Resamine X) 2 parts, water 50 parts, MEK 5 parts, and water repellent (Resamine UM-317) 2 parts, and a foaming agent (trade name Microsuf Air F-50D, manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) A uniform mixture of 30 parts was applied with a knife coater at 100 g / m ² and
Dry at 80 ° C for 2 minutes, then at 100 ° C for 2 minutes. On top of that, a resin containing 30 parts of collagen (triazet) in the above composition was added as a solid component at 10 g / m ² and then dried at 80 ° C for 1 minute and then foamed at 130 ° C for 1 minute. A breathable waterproof cloth was obtained.

Comparative Example 1 Nylon taffeta was used as the fiber base material, and 100 parts of urethane resin emulsion (Himlen X-3038) and ME were used as the base material.
K 13 parts, toluene 17 parts, water 50 parts, MEK 5 parts, crosslinking agent (Resamine X) 2 parts, and water repellent (Resamine UM-31
7) 200g of a mixture of 2 parts mixed with a knife coater
/ M ^{2 and then} dried at 80 ° C. for 2 minutes and further at 130 ° C. for 2 minutes to form a microporous resin layer to obtain a moisture permeable waterproof fabric.

Comparative Example 2 The fiber base material was polyester / Kotton = 70/30, and the urethane resin emulsion (Heimren X-304) was used as the base material.
0) 100 parts, MEK 13 parts, toluene 18 parts, water 50 parts, M
A mixture of 5 parts of EK, 2 parts of crosslinking agent (Resamine X), 2 parts of water repellent (Resamine UM-317), and 30 parts of foaming agent (Microsufair F-50D), uniformly mixed with a knife coater at 100 g / after m ² coated, dried for 2 minutes at 80 ° C.,
Further, foaming was performed at 130 ° C. for 1 minute to obtain a moisture-permeable waterproof fabric.

COMPARATIVE EXAMPLE 3 Nylon taffeta was used as the fiber base material, polyethylene glycol and isophorone diisocyanate were heat-polymerized thereon by a conventional method, and the resulting polymer was dissolved in a toluene-isopropanol mixed solvent. Then, this solution is coated with a knife coater at 100 g / m ^{2 and} dried at 50 ° C for 2 minutes.
It was dried at 0 ° C for 2 minutes to obtain a moisture-permeable waterproof fabric.

Table 1 shows the moisture permeability, the water pressure resistance, the surface water absorption, and the feel to the touch of the cloths obtained in Examples and Comparative Examples. The moisture permeability is JIS Z0208B method, and the water pressure resistance is JIS.
L-1092 and surface water absorption were evaluated according to JIS P-8140.

Next, the moisture-permeable waterproof fabrics obtained in Example 1 and Comparative Example 1 were left at 20 ° C. × 50% RH for 24 hours, and then 40
Fig. 7 shows the results of measuring the amount of moisture absorption by measuring the change in weight over time by placing the sample at ℃ x 90% RH. It can be seen from FIG. 7 that the initial hygroscopicity is good when collagen is added to the outermost layer, and when the initial hygroscopic capacity is present, there is no stuffiness and dew condensation is difficult.

[0030]

[Table 1]

[0031]

EFFECTS OF THE INVENTION In the moisture-permeable waterproof fabric of the present invention, by providing a thin film layer containing collagen as the outermost layer on the skin side, strength and texture are not impaired, and the vapor and sweat of sweat emitted from the human body can be quickly Since it absorbs and is diffused through the moisture permeable resin layer, it is possible to obtain a moisture permeable waterproof fabric that does not raise the humidity inside clothes, does not feel stuffy, and has excellent dew condensation prevention properties. Further, by foaming the lower layer, it is possible to further improve heat retention and touch.

[Brief description of drawings]

1 and 2 are cross-sectional views of a moisture-permeable waterproof fabric corresponding to claim 1 of the present invention.

FIG. 3 is a cross-sectional view of a moisture-permeable waterproof fabric corresponding to claim 2 of the present invention.

4 to 6 are cross-sectional views of the fabrics of Comparative Examples 1 to 3.

FIG. 7 is a graph showing the moisture absorption rates of the moisture-permeable waterproof fabrics of Examples and Comparative Examples.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber substrate 2 Microporous moisture-permeable resin layer 3 Collagen 4 Non-porous moisture-permeable resin layer 5 Moisture-permeable foam layer 6 Closed cells

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location D06M 15/15 // D06M 23/12 7199-3B D06M 21/00 F (72) Inventor Tomio Shimizu Hyogo Factory, Toyo Tire & Rubber Co., Ltd.

Claims (3)

[Claims] 1. A microporous or nonporous moisture-permeable resin layer is laminated on a fibrous base material, and further, a solid content containing collagen of 0.5 to 50 g / m ² is used. A moisture-permeable waterproof cloth, which is obtained by laminating a non-porous moisture-permeable resin layer. 2. The moisture-permeable waterproof cloth according to claim 1, wherein the microporous or non-porous moisture-permeable resin layer is a foam layer having closed cells. 3. A moisture-permeable resin foam layer having closed cells is formed by heat-expanding heat-expandable microcapsules obtained by embedding a vaporizable liquid in a thermoplastic resin film in a moisture-permeable resin. The moisture permeable waterproof fabric according to claim 2.