JPS6037229B2 - Method for manufacturing moisture-permeable waterproof fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a moisture-permeable waterproof fabric.

Accordingly, the manufacturing method of waterproof fabric that has moisture permeability that reduces stuffiness when worn usually involves the use of a polymer of PoIJ urethane,
A polymer solution in which the copolymer is dissolved in a polar solvent, such as dimethylformamide alone or a mixed solvent such as methyl ethyl ketone, is applied to one side of Futake, and immediately soaked in water or an aqueous solution of a water-miscible solvent. A wet coating method is used in which a microporous film is formed by solidifying the film by replacing the solvent with the film.

However, this wet coating method requires adjustment of coagulation rating,
Requires sophisticated and complex control of elution rate, removal of eluent, etc., requires relatively long processing time, and requires drying finishing equipment and pollution prevention solvent recovery equipment, resulting in high equipment costs and increased costs. There was a drawback.

On the other hand, the dry coating method, which can perform waterproofing with simple equipment and high efficiency, tends to make the pores of the formed film continuous, and even if the pores of the parenthetical film become discontinuous, compared to The drawback was that the waterproof properties were poor due to the high air permeability.

In order to solve the above-mentioned drawbacks, this invention has achieved high waterproofness, that is, water pressure resistance of 1000 or higher (JIS-LI079) using an economical dry coating method.
) while maintaining moderate moisture permeability, i.e. moisture permeability 7 out of 9.
/ ground / h or more (JIS-K6549) or air permeability 0
．． This is a method for manufacturing a moisture-permeable waterproof fabric that can have an s of 1 cc/s or more (JIS-LI079 Frazier type method).

Hereinafter, a method for manufacturing a moisture permeable waterproof fabric of the present invention will be explained.

First, the first manufacturing method of this permeable waterproof fabric is to dissolve acrylic rubber in an organic solvent and to prepare 10 parts by weight of a solution containing acrylic rubber as a main component and having a solid content concentration of 5 to 30% by weight. 5 to 40 parts by weight of water, 5 to 5 parts by weight of a water repellent agent, and a solvent that has an affinity for both the organic solvent in which the acrylic rubber is dissolved and water, but cannot dissolve the acrylic rubber alone. A polymer dispersion mixture prepared by mixing 5 to 4 parts by weight (hereinafter referred to as a non-solvent) and a small amount of a cross-linking agent is applied to the surface of a cloth and dried, and then a filtration agent is attached to it. This is a method for producing a transparent green waterproof fabric characterized by subjecting it to heat and pressure treatment.The second production method is to dissolve acrylic rubber in an organic solvent to reduce the concentration of solids mainly composed of acrylic rubber. 5 to 4 parts by weight of water, 5 to 5 parts by weight of a water repellent to 100 parts by weight of a solution that is 5 to 3% by weight,
A polymer dispersion mixture prepared by mixing 5 to 40 parts by weight of a non-solvent and a small amount of a crosslinking agent is applied to the surface of the fabric band and dried to form a first film, and then the above-mentioned coating is applied to the surface of the first film. A metal-containing polymer dispersion mixture in which 5 to 3 parts by weight of metal fine powder is mixed with 10 parts by weight of a liquid having the same composition as the polymer dispersion mixture is applied and dried to form a second film having metallic luster. This is a method for producing a moisture-permeable waterproof fabric having heat retaining properties, which is characterized by forming a water-retaining fabric, and subjecting the fabric to a water-retaining agent and heat-pressing treatment. Here, the acrylic rubber in this invention is a main polymer mainly composed of acrylic esters such as ethyl acrylate and butyl acrylate, and the comonomers are usually acrylonitrile, glycidyl methacrylate, and 2-chloroethyl pinylene. Reuter, methyl vinyl ketone, 2-chloroethyl acrylate, etc. are used in an amount of about 5 to 1% by weight. Although there is no problem with such Acrylic IJ rubber when used alone, it is recommended that fillers such as calcium carbonate powder, silica powder, and fine cellulose powder, known ultraviolet absorbers, and stabilizers be mixed in for reinforcement. can do. Further, as a blended solution, polyurethane resin, amino acid resin, nitrile butadiene elastomer, chlorosulfonated polyethylene elastomer, etc. can be mixed and blended with acrylic rubber in an amount of up to 30% (weight ratio). It is preferable to use a material mainly composed of acrylic rubber in the form of a solution in an organic solvent such as toluene, ethyl acetate, or methyl ethyl ketone at a concentration of 5 to 30% (solid content). Water, water repellent agents and non-solvents are substances that have poor affinity for polymers,
When high pressure or high-speed lighting is applied as in normal emulsion production, air is drawn in and large bubbles are created. Therefore, the appropriate mixing ratio (see Table 1), which has been confirmed through experiments in advance, must be selected to prevent bubbles from forming. It is important to gradually mix in the water at low speed.

The amount of water mixed in affects the stability of the polymer dispersion mixture and the particle size of the dispersed particles, which will be described later. The dispersible range is 5 to 40 parts by weight, but if the ratio increases, the pore size of the film becomes large and the water pressure resistance becomes less than 50 mm, making it impossible to obtain a high degree of waterproofing, so a weight range of 1 is desirable.

As the water repellent, a silicone water repellent, a fluorine water repellent, a wax water repellent, etc. are used, and among them, a perfluoroalkyl acrylate fluorine water repellent is preferred. At this time, the surfactant in the water agent helps to emulsify the polymer and produces a stable polymer dispersion mixture with a solid content of 5 to 30%. 00 parts by weight 5
The dispersible range is ~5 parts by weight, and the higher the ratio, the better the emulsified state will be, but it will inhibit the adhesion between the fabric and the coating film, resulting in poor durability, so it is desirable to use 2 parts by weight or less. .

Examples of the non-solvent include n-butanol, isopropyl alcohol, ethyl alcohol, acetone, etc., which have extremely high solubility in water, and are interposed between the polar solvent and water in the acrylic rubber solution. It improves bookkeeping properties and works in conjunction with the emulsifying power of the water repellent to stabilize the polymer dispersion.

This non-solvent has a solid content of 5
The dispersible range is 5 to 4 parts by weight per 100 parts by weight of ~30% solution, but as shown in Table 1, the relationship between the blending ratio and physical properties (water pressure resistance, air permeability, moisture permeability), Electron microscope observation of coating film (300x, 100M sound)
From these results, 15 parts by weight seems to be appropriate. Also,
．． Usually, acrylic copolymer dispersions contain highly safe crosslinking agents such as toluene diisocyanate and methylene diisocyanate, as well as polyisocyanates having two or more isocyanate groups and phenol in polyisocyanates. , block isocyanate crosslinking agents with added alcohol, trimethylolmelamine, hexamethyl.

Add a melamine crosslinking agent such as melamine. The purpose of this is to fix the coating film to the fabric and to improve the strength and flexibility of the film itself. These crosslinking agents should not be added in excess because they affect the feel and flexibility of the waterproof fabric, and it is usually desirable to add 0.1 to 0.5% (weight ratio). In this way, in a solution containing acrylic rubber,
By blending appropriate proportions of water, water repellent, non-solvent, crosslinking agent, etc., the polymer dispersion mixture of the present invention is prepared, and this polymer dispersion mixture is bonded to the surface. For example, fabrics with a yarn density of 180 to 250 yarns/0 cm using synthetic fiber filaments such as nylon or polyester of 50 to 80 deniers, and fabrics made of synthetic fiber filaments and spun yarn are relatively thin. A smooth interwoven fabric is applied.

Note that fabrics with many irregularities on the surface, coarse thread density, and large thread spaces are difficult to form into transparent waterproof fabrics and are therefore unsuitable for use in this invention. A pretreatment is performed to heat and compress the threads through the threads to reduce the thread space within the tissue. This preservative treatment has the effect of preventing the polymer dispersion mixture from penetrating into the fabric's rich structure, making the application uniform, and giving it a soft texture. It is desirable that the air permeability of the pretreated fabric be reduced to about 1/sale of that of the untreated fabric. Unlike the conventional wet coating method, the method of applying the polymer dispersion mixture to the cloth surface of this invention uses a roll coater, a knife coater, a reverse roll coater, a gravure coater, etc., which are used in a normal dry coating method. The following coating machines are applicable, but knife coaters and roll coke are particularly preferred because they can form a thin and uniform film.

The coating film varies depending on the structure of the fabric corner, but for example, in the case of a nylon plain fabric with a denier of 70 and a thread density of 210 threads/0 dimension, the amount of the polymer dispersion blended liquid is 3 to 25% based on the weight of the fabric.
% (solid content) attached.

Then, the drying process after application starts from 5000 and gradually increases to 150.
It is important to process at a high temperature range of ℃. If the temperature is increased rapidly (130 to 150 qo), water and solvent will evaporate at the same time, making it impossible to obtain a uniform microporous film. Therefore, the Futake is made to pass through temperature zones divided within the drying temperature range of 50 to 150° C. for 3 to 5 minutes. The cloth that has been coated with the polymer dispersion mixture and dried in this way (the film formed at this time is called the first film) may not reach the desired degree of waterproofing if it is left untreated, so it may be necessary to further Adhesion of a purification agent and heat and pressure treatment are required.

In the water repellent application step, a water repellent such as a fluorine-based agent is applied to the coated fabric by a dipping method or a coating method.
1 to 5% (solid content) is deposited and heat treated using a dryer such as a pin setter or non-touch dryer at a temperature of 100 to 190 qC for a treatment time of 2 minutes to 2 minutes. This water repellent adhesion completes the cross-linking of the microporous film, increasing its adhesion to the fabric, the strength and flexibility of the film itself, and improving its waterproof performance due to the water repellent effect. In addition, heat and pressure treatment is performed at a temperature of 120
~18,000 pressure (linear pressure) 5 to 40 tons (200 ratio width) The coated cloth strip is passed between thermal calender rolls to firmly press the cloth and the coating to obtain a more even microporous coating. be able to. As an experimental example of a waterproof fabric manufactured by the method for manufacturing a moisture-permeable waterproof fabric according to the present invention, as shown in Table 1, a 70 denier, 210/inch nylon filament plain fabric was placed between thermal calender rolls at a temperature of 150°C. pre-treated through the air permeability 1 ratio c/
On one side of the cloth, which has been kept to s or less, apply 10 parts by weight of acrylic rubber with a solid content of 20%, 2 parts by weight of water repellent, 10 parts by weight of water, 15 parts by weight of non-solvent, and 0.1 parts by weight of crosslinking agent. 5 to 15% (solid weight) of the polymer dispersion mixture mixed with 100% of the total weight was applied to the cloth, and gradually dried from 50°C to 150qo, and then soaked in a fluorocarbon aqueous solution to a thickness of 0.5% by weight. % (solid content) A waterproof fabric with a microporous film obtained by applying a water repellent to be attached, curing for 1 minute at a temperature of 160 qo, and thermocompression bonding with a hot calender roll at a temperature of 15 pi 810 ribs, moisture permeability 11/h, air permeability 0. is c/
A good result of /s can be obtained.

In addition, in order to impart thermal properties in addition to higher waterproof properties, a metal-containing compound is prepared by mixing 5 to 3 parts by weight of fine metal powder such as aluminum, zinc, copper, and steel alloys to 10 parts by weight of the polymer dispersion mixture. A polymer dispersion mixture is applied onto the first film to form a laminated film in which a second film having a metal photoreceptivity is attached to the fabric in an amount of 5 to 3% by weight (solid content). It is possible to apply twill water agent and heat and pressure treatment.

The metal fine powder used has an average particle size of aluminum of 10
~20 mountains are preferred. This waterproof fabric with a metallic two-layered microporous coating was tested in a heat retention tester (shothehada HIT) and one with a second coating that did not contain metal powder.
), the amount of heat dissipated was measured and compared in terms of heat flow value (Kcal/meh).
At l/. Since a low result was obtained, it was proved that the material had heat insulating properties, that is, heat retention properties. In addition, this waterproof fabric is coated with two layers, so it has a water pressure resistance of over 100 degrees and a moisture permeability of 1.
Good results are obtained with air permeability of 0.9/cloth/h or more and air permeability of 0.1 cc//s or more, and it is softer to the touch than conventional polyurethane polymer waterproof fabrics. . Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 10 parts by weight of polyacrylic ester resin (manufactured by Teikoku Kagaku Sangyo, 18% solids dissolved in triol), 2 parts by weight of a pyrogenic water repellent Scotchgard FC232 (manufactured by Sumitomo 3M), and 1 part by weight of acetone. 10 parts by weight of water, and 0.1 part by weight of isocyanate crosslinking agent Catalyst #40 (manufactured by Teikoku Kagaku Sangyo) in a dissolver to prepare a polymer dispersion mixture in the form of a kg mass.

Dyed nylon taffeta (70 denier, thread density 210)
The fabric was pretreated by applying pressure with a 150 oo heat calender roll, and the fabric was coated with the above polymer dispersion mixture using a roll knife coater.
It was dried and coagulated in a dryer at 0 qC to form a film with a solid content of 11 mm.

This coated fabric was padded with a 2% aqueous solution of fluorocarbon FC220 (manufactured by Sumitomo 3M) and dried for 160q.
After baking for 2 minutes at 100 ℃, it was heated and pressed using a hot calender roll at 150 qC. The physical property test results are shown in Table 2. Example 2 Dyed polyester taffeta (warp 7
5 denier weft 50 denier yarn density 190 inches) 1
Pre-treatment is performed by applying pressure with a 70q0 heat calender roll,
This cloth was coated with the polymer dispersion mixture of Example 1 using a roll knife coater, dried and coagulated in a drying range of 6000, 100q0, 150oo, and then aluminum powder (STAPAAV-1 A metal-containing polymer dispersion mixture to which 15 parts by weight (manufactured by Sako Kasei Kogyo Co., Ltd.) was added was applied with a roll knife coater and dried and coagulated to form a film with a solid content coverage of 9 parts per coat.

Thereafter, the same water repellent treatment and heat pressure treatment as in Example 1 were performed. The physical properties of the obtained waterproof fabric are also listed in Table 2. Example 3 Coating was carried out in the same manner as in Example 1 by pressurizing dyed polyester smooth (fabric weight 280 mm/force) with a 150 mm hot calender roll to form a film with a solid content coverage of 24 mm/cm. A metal-containing polymer dispersion mixture was applied and laminated thereon in the same manner as in Example 2 to form a second film with a solid content coverage of 28 mm.

Thereafter, the same water repellent treatment and heat pressure treatment as in Example 1 were performed. The physical properties of the obtained waterproof fabric are also listed in Table 2. Daiichi Oyoyo *1 20% solid content standard *2 Fluorinated wastewater agent *3 Resin adhesion amount 10-15% (solid content weight) Water pressure resistance
JIS-LI079 air permeability JIS-LI079 Frazier method moisture permeability JIS-K6549 Table 2

Claims (1)

[Claims] 1. A solution 1 in which acrylic rubber is dissolved in an organic solvent and the solid content concentration is 5 to 30% by weight, and the main component is acrylic rubber.
00 parts by weight, 5 to 40 parts by weight of water, 5 to 5 parts by weight of water repellent
0 parts by weight, 5 to 40 parts by weight of a solvent that has an affinity for both the organic solvent in which the acrylic rubber was dissolved and water but cannot dissolve the acrylic rubber alone, and a small amount of a crosslinking agent. A method for producing a moisture-permeable waterproof fabric, which comprises applying a polymer dispersion mixture onto the surface of the fabric, drying it, and then applying a water repellent to the fabric and subjecting it to heat and pressure treatment. 2. Solution 1 in which acrylic rubber is dissolved in an organic solvent and the solid content concentration is 5 to 30% by weight, and the main component is acrylic rubber.
00 parts by weight, 5 to 40 parts by weight of water, 5 to 5 parts by weight of water repellent
0 parts by weight, 5 to 40 parts by weight of a solvent that has an affinity for both the organic solvent in which the acrylic rubber was dissolved and water but cannot dissolve the acrylic rubber in single action, and a small amount of a crosslinking agent. After coating the surface of the fabric with a polymer dispersion mixture and drying it to form a first film, a solution 10 having the same composition as the polymer dispersion mixture is further applied to the surface of this first film.
A metal-containing polymer dispersion mixture containing 5 to 30 parts by weight of metal fine powder per 0 parts by weight is applied and dried to form a second film with metallic luster, to which a water repellent is attached and heat applied. A method for producing a moisture-permeable waterproof fabric having heat retention properties, which is characterized by subjecting it to pressure treatment.