JPH0214078A - Production of heat insulating moisture-permeable and waterproof fabric - Google Patents

Abstract

PURPOSE:To obtain a soft and excellent heat insulating, moisture-permeable and waterproof fabric by forming a resin composition containing specific metallic powder added to a one-pack type moisture permeable polyurethane resin into a thin film, applying a specified resin composition onto the resultant thin film and laminating a fabric thereto. CONSTITUTION:For example, a resin composition containing metallic fine powder having <=0.3 emissivity (preferred example; aluminum) added to a one-pack type polyurethane resin is applied to a polypropylene-coated paper with a knife coater, etc., to form a skin layer of the above-mentioned resin. The resultant skin layer is then coated with a resin composition consisting of a two-pack type polyether polyol-modified polyurethane resin, melamine derivative, organic polyisocyanate (e.g., diphenylmethane-4,4'-diisocyanate) and a crosslinking catalyst (e.g., consisting of a melamine crosslinking and urethane crosslinking catalysts). A fabric consisting of a polyester-based fiber is subsequently laminated thereto through the afore-mentioned composition and thermocompression bonded to afford the objective heat insulating, moisture-permeable and waterproof fabric having excellent mechanical characteristics and suitable for sportswear, etc.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a fabric with excellent waterproofness, moisture permeability, heat retention, flexibility, and mechanical properties suitable for sportswear, casual wear, rain gear, sleeping bags, etc. related to the manufacture of

<Prior Art> Many methods for manufacturing waterproof fabrics have been proposed.

The first method is to attach a water-repellent resin porous membrane such as polytetrafluoroethylene to a fabric, and the waterproof and moisture-permeable fabric obtained by this method certainly has excellent waterproofness and moisture permeability. However, the texture is somewhat rough and hard.
It has the disadvantage of poor elasticity. In addition, with this method, adhesion is difficult, and it is hard to say that the adhesive force between the membrane and the fabric is sufficient (Japanese Patent Application Laid-Open No. 46-7284 or 50-228).
Publication No. 1). The second method is to apply the polyurethane solution directly to the fabric and then immerse the coated fabric in water to extract the solvent and form a porous film, or to apply the polyurethane solution on a release film. After that, there is a method in which a porous film formed by immersing the fabric in water is laminated to the fabric and then subjected to a water repellent treatment. Although the moisture permeable waterproof fabrics obtained by these methods have excellent moisture permeability, it is difficult to control the diameter of the micropores. Therefore, there are disadvantages in that the waterproof property tends to vary and the abrasion strength of the porous urethane film is low. In addition, the wet method requires high equipment costs and requires solvent recovery (Japanese Patent Laid-Open No. 56-26
No. 076, Japanese Unexamined Patent Publication No. 57-205586).

In order to overcome the above-mentioned drawbacks, various methods have been proposed as a third method, such as forming a moisture-permeable polyurethane film using a dry method and then bonding it to the fabric, or directly coating it on the fabric. (Japanese Patent Application Laid-Open No. 59-53786, Japanese Patent Application Laid-Open No. 59-76973), the non-porous film is formed on the fabric, so it has poor moisture permeability.

If you try to improve moisture permeability, the waterproofness and adhesion to the base fabric will deteriorate, but the technology that satisfies all the characteristics such as moisture permeability, waterproofness, flexibility, and adhesion to the base fabric has not yet been completed. It has not been. In addition, even higher heat retention properties are often required in applications such as Schlaf.

<Object of the invention> The present invention solves the above-mentioned drawbacks, has suitable drapability and flexibility, and satisfies the functional aspects of heat retention, moisture permeability, and waterproofness, and also has excellent adhesion with fabrics and abrasion of the film. The object of the present invention is to provide a dry method for manufacturing clothing fabrics that also have mechanical properties such as strength.

Structure of the Present Invention In other words, the present invention provides a method for producing a moisture-permeable waterproof fabric in which a fabric is coated with a resin mainly composed of a polyurethane polymer, in which the moisture-permeable polyurethane resin has a radioactivity value of 0. A resin composition containing a fine metal powder of 3 or less is formed into a thin film, and the thin film is coated with a resin composition (A+) consisting of a two-component polyether polyol-modified polyurethane resin, a melamine derivative, an organic polyosocyanate, and a crosslinking catalyst. 1. A method for producing a heat-retaining, moisture-permeable, waterproof fabric, which comprises laminating fabrics together via a resin composition (A).

The fiber material used for the fabric here may be any of polyester, polyamide, polyolefin, polyurethane, etc., but polyester fibers are particularly preferred. The fabric can be woven or knitted, non-woven, or a combination of these, but it is recommended that the fabric be a high-density fabric using fine denier yarn of 2 deniers or less to improve heat retention, moisture permeability, This is preferable from the viewpoint of waterproofness.

The metal-based fine powder to be mixed into the one-component moisture permeable polyurethane resin is one with a radioactivity value (value listed in Section 20 of the Chemical Engineering Handbook (Revised 4th edition) of the Japan Society of Chemical Engineers) of 0.3 or less. be. If it exceeds 0.3, absorption and radiation of heat rays will increase and the heat shielding effect will decrease.

If the radiation activity is 0.3 or less, the radiation ability of the heat rays is low, so that absorption and radiation of heat by the heat rays is difficult to occur, and the heat shielding property is improved.

The metal-based fine powder may be any metal-based substance with a radioactivity of 0.3 or less, but aluminum, copper, nickel,
Preferably, one or more metal-based fine powders selected from the group consisting of brass, iron, titanium, and their oxides are used.

In addition, aluminum is particularly preferable from the viewpoint of lightness. The metal-based fine powder may be a metal fine powder, a metal compound fine powder, or a mixture of both. The shape of the metal-based fine powder may be any shape, but from the viewpoint of the heat ray shielding effect, non-spherical shapes such as linear, rod-like, and flaky shapes are preferable, and shapes such as long flakes, scales, and cloud-like shapes are more preferable. is particularly preferred.

Here, the one-component moisture-permeable polyurethane resin includes a urethane prepolymer obtained by reacting a polyester polyol or polyether polyol containing a polyoxyalkylene glycol unit with a polyvalent incyanate, and a polyfunctional chain extender having active hydrogen, such as a polyester polyol containing a polyoxyalkylene glycol unit. Polyurethane obtained by reacting a polyhydric amine or a polyhydric alcohol can be used.

The two-component polyether polyol-modified polyurethane resin herein refers to (a) a polyoxyalkylene glycol having an average molecular weight of 500 to 5,000, such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, glycerin, or ethylene oxide or propylene oxide of trimethylolpropane; 5 to 60 parts by weight of polyoxyalkylene glycols such as adducts, or mixtures or copolymers thereof, preferably 1
0 to 40 parts by weight, and (b) polyester with an average molecular weight of 500 to 5,000, such as organic polybasic acids such as succinic acid, adipic acid, sebacic acid, maleic acid, and terephthalic acid, and ethylene glycol, propylene glycol, butylene glycol, hexamethylene glycol. , a polyester produced by polycondensation with an organic polyhydric alcohol such as diethylene glycol or glycerin, a polyester produced by ring-opening polymerization of lactonic acid, or a mixture or copolymer thereof 95 to 40 parts by weight, preferably 9
0 to 60 parts by weight and (A) an organic polyisocyanate such as diphenylmethane-4,4'-diisocyanate;
It refers to a polyurethane resin obtained by reacting 5 to 25 parts by weight of an isocyanate such as tolylene diisocyanate, naphthalene diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, or a mixture thereof.

If the polyoxyalkylene glycol is less than 5 parts by weight, the moisture permeability will be poor, and if it is more than 60 parts by weight, the adhesion to the fabric will be low and the polyurethane film will become wet when wet.

If the amount of organic polyisocyanate is less than 5 parts by weight, the mechanical properties of the polyurethane film will be insufficient, and if it is more than 20 parts by weight, the polyurethane film will become rough and hard and its adhesive strength with the fabric will decrease.

Melamine derivatives are compounds represented by the following general formula.

R1~N-R2 Ma However, in the formula, R1 to Ra are -H, -CH20H.

-CH20CnH2゜+1 (where n is an integer from 1 to 16), -C) I2c艮OH, -CON ratio, -CONHC
It is a group selected from the group consisting of ∾OH. In addition, it includes an initial condensate of the compound represented by the above-mentioned general formula or an acid colloid compound. The amount of these melamine derivatives used is preferably 2% by weight or more, preferably 5 to 20% by weight, based on the two-component polyether polyol-modified polyurethane resin. If it is less than 2% by weight, the adhesive strength will be insufficient.
If it exceeds % by weight, the texture of the film will become rough and hard.

Examples of the organic polyisocyanate compound as a two-component polyurethane crosslinking agent include hexamethylene diisocyanate, 0-lm- or p-phenylene diisocyanate, 2,4- or 2°6-tolylene diisocyanate, and hydrogenated aromatic rings. 2, 4-or 2.
6-) Lylene diisocyanate, diphenylmethane-4
, 4'-diisocyano-t, 3.3'-dimethyl 4.4'-biphenylene diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, isophorone diisocyanate, ω, ω'-diisocyanate 4
．． Examples include 4-dimethylbenzene, ω, ω′-diisocyanate 1,3-dimethylbenzene, and the like.
These can be used alone or in combination.

The amount of organic polyisocyanate-1 to be used is preferably 3 to 20 parts by weight per 100 parts by weight of the two-component polyether polyol-modified polyurethane resin and melamine derivative.

The crosslinking catalyst consists of a melamine crosslinking catalyst and a urethane crosslinking catalyst, and an acidic catalyst is used as the melamine crosslinking catalyst. For example, aliphatic carboxylic acids such as formic acid and acetic acid, olefin carboxylic acids such as acrylic acid, saturated dicarboxylic acids such as oxalic acid and succinic acid, oxycarboxylic acids such as malic acid and tartaric acid, aromatic dicarboxylic acids such as phthalic acid, and the like. ammonium salts, organic amine salts, sulfonic acids such as dodecylbenzenesulfonic acid and p-toluenesulfonic acid, and their ammonium salts, sulfuric acid, hydrochloric acid, phosphoric acid,
Examples include inorganic acids such as nitric acid and their ammonium salts. These catalysts are preferably used in an amount of 0.1 to 20% by weight based on the melamine derivative.

As the urethane crosslinking agent, for example, organometallic compounds such as dibutyltin dilaurate, triethylenediamine, and stannath octoate, and tertiary amines such as N-methylmorpholine are used. The amount used is preferably 0.1 to 10% by weight based on the organic polyisocyanate.

Next, a method for manufacturing the heat-retaining, moisture-permeable, waterproof fabric will be described below.

Apply an organic solvent solution of commercially available moisture-permeable one-component polyurethane and metal fine powder to polypropylene-coated paper or silicone-coated paper as a skin layer using a conventional coating machine such as a knife coater, comma coater, or kiss roll coater. It is coated to a solid content of 3 to 20 g/rrf and dried in a dryer at a temperature of 70 to 120°C to obtain a moisture permeable urethane film containing fine metal powder.

Next, as an adhesive layer, an organic solvent solution of <A+ is coated on the urethane film formed on the release paper using a coating machine so that the solid content is 5 to 25 g/rrf, and then dried at 60 to 100°C in a dryer. The organic solvent is semi-dry or completely dried in the temperature range of . Next, laminated with base fabric, temperature 100
Thermocompression bonding is carried out using a hot roll at ~130°C and a pressure of 3~30 kg/al. The release paper is then peeled off, and the resulting fabric is impregnated with a solution of a water repellent, preferably silicone-based or fluorine-based, and then dried to obtain a moisture-permeable waterproof fabric.

<Effects of the Invention> The heat-retaining, moisture-permeable, waterproof fabric obtained by this method has excellent heat retention, flexibility, moisture permeability, and waterproofness, and has excellent adhesiveness to the base fabric.
Polyurethane has excellent mechanical properties such as film strength, making it a suitable material for sportswear, rain gear, and other applications that require various functions such as heat retention, moisture permeability, and waterproofness.

<Example> The present invention will be specifically explained below with reference to Examples.

In the Examples, the values of moisture permeability, water resistance, film abrasion resistance, and peeling strength between the film and the base fabric were determined as follows.

Moisture permeability (g/ryf/24hr) Water pressure resistance (mmH20) according to the method of JIS K-6328 Water deflection point (point) according to the method of JIS L-1092 Peel strength (g/cm) according to the method of JIS L-1092 JIS K Using a Membrane Rubbing Resistance Gakushin Rubbing Fastness Tester according to the method of -6328, the polyurethane surfaces are stacked and rubbed together 100 times under a load of 500 g. If the polyurethane surface has no damage at all, it is grade 5. If the polyurethane surface is only partially damaged, it is grade 4. If the polyurethane surface is damaged to the extent of 1 part 3, it is grade 3. If the polyurethane surface has completely peeled off, it is grade 1. Displayed as grade.

Note that parts and % in the examples represent parts by weight and % by weight, respectively.

Example 1 One-component moisture permeable polyurethane: 1100 parts of Crisbon 3314 (manufactured by Dainippon Ink & Chemicals), 6 parts of aluminum paste 6170 (manufactured by Toyo Aluminum), Yellow Rika zx-y
A polyurethane solution containing 8 parts of yellow 230 (manufactured by Mikuni Shiki) was coated on polypropylene coated paper using a comma coater so that the solid content was 8 g/rd, and heated and dried at 100°C for 2 minutes to coat the epidermis. A layer was formed.

Next, 20 parts by weight of polyethylene glycol having an average molecular weight of 1500, 80 parts by weight of polybutylene adipate diol having an average molecular weight Jt of 2.000, and 15 parts by weight of tolylene diisocyanate were mixed into 173 parts by weight of a mixed solvent of 105 parts by weight of toluene and 68 parts by weight of dimethylformamide. The reaction was carried out in parts by weight to obtain a two-component polyether polyol-modified polyurethane resin solution with a resin concentration of 40% by weight.

Add 10 parts by weight of trimethylolmelamine to this solution (8 parts by weight for 2-component polyether polyol-modified polyurethane resin).
Furthermore, 15 parts by weight of hexamethylene diisocyanate, 0.5 parts by weight of p-)luenesulfonic acid, and 0.5 parts by weight of dibutyltin dilaurate were added to obtain a two-component polyether polyol-modified polyurethane resin. .

The resin composition (A) was applied as an adhesive to the previously prepared skin layer so that the adhesive solid content was 18 g/rn'.
Dry at ℃ for 30 seconds to obtain a thin resin film.

Next, a plain fabric using polyethylene terephthalate filament yarn (75 denier/72 filament) for the warp and weft was dyed with disperse dyes (C, I) using a conventional method.

After scouring and dyeing using No. Disperse Blue 139), water repellent processing was performed by impregnation using a 5% aqueous solution of the water repellent agent Asahi Guard AG710 (manufactured by Meisei Chemical Co., Ltd.), followed by calendering and camfit processing.

The resulting dark blue water-repellent plain fabric (warp density 116/'2
, 54 cm, weft density 94 threads/2.54 cm) and the resin thin film were pasted together through a heating roll at 120° C., and after aging for 2 days, the release paper was removed. The obtained gold-colored laminate fabric was flexible, had excellent moisture permeability, waterproofness, and heat retention, and was brightly colored and fashionable. The main characteristic values were as follows.

Water pressure resistance: 2000 mm or more Water repellency: 90 points Moisture permeability: 3000 g, /ni'/24hr
Heat ray reflection ratio 37% Peel strength 700g/am Membrane handling resistance Grade 5

Claims (1)

[Claims] A method for producing a moisture-permeable waterproof fabric in which a fabric is coated with a resin mainly composed of a polyurethane polymer, in which a one-component moisture-permeable polyurethane resin is added with metal-based fine powder having a radioactivity value of 0.3 or less. The composition is formed into a thin film, and the thin film is coated with a resin composition (A) consisting of a two-component polyether polyol-modified polyurethane resin, a melamine derivative, an organic polyisocyanate, and a crosslinking catalyst, and a fabric is coated through the resin composition (A). A method for producing a heat-retaining, moisture-permeable, waterproof fabric characterized by lamination.