KR19980066145A - Water-permeable waterproof fabric with excellent environmental response function and its manufacturing method - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a water-repellent waterproof fabric and a method of manufacturing the same, which are excellent in water resistance and moisture permeability, and particularly excellent in environmental response.

2. The technical problem to be solved by the invention

It is excellent in water resistance and moisture permeability, in particular, it is excellent in environmental response function to improve the thermal insulation at low temperatures and to improve the moisture permeability at high temperatures to provide a moisture-proof waterproof fabric that can always feel comfortable in any environmental conditions.

3. Summary of Solution to Invention

Two or more hydrophilic non-porous polyurethane films were prepared by applying polyurethane resins having respective glass transition temperatures in the range of -10 to 30 ° C. but having a temperature difference of 5 to 30 ° C., respectively, on a release paper. Then, they are laminated on the fabric in any order.

4. Important uses of the invention

The waterproof breathable fabric of the present invention is used to manufacture sportswear, mountaineering clothes and ski wear.

Description

Water-permeable waterproof fabric with excellent environmental response function and its manufacturing method

The present invention is excellent in water resistance and moisture permeability, and particularly in terms of environmentally compatible functionality, the invention relates to a water-repellent waterproofing fabric and a method for producing the same, wherein the heat retention at high temperatures is high.

Breathable waterproof fabric is used as a fabric for clothing worn during intense exercise under relatively harsh weather conditions, such as sports wear, mountaineering clothes and ski wear.

Therefore, the waterproof fabric not only blocks raindrops during rainfall, but also maintains body temperature in clothing in low temperature environments, and maintains the temperature in clothing by releasing sweat emitted from the body in high temperature environments following intense exercise. There is a demand for a function that can always express a comfortable fit.

As a conventional technique for manufacturing a moisture-permeable waterproof fabric, microporous or hydrophilic non-porous polyurethane membranes are formed directly on one side of a fabric by dry method or wet method in JP-A-63-230337 and JP-A-47058. Lamination method is shown.

However, in the case of the moisture-permeable waterproof fabric using the conventional microporous polyurethane membrane, the moisture permeability is good, but the loss of body temperature is large through the micropores in the low temperature environment, and in the case of the water-resistant waterproof fabric using the hydrophilic non-porous membrane, the water resistance and the heat resistance in the low temperature environment Silver is good, but there is a problem in that a high sweating environment does not express a comfortable fit because it does not release sweat appropriately.

In addition, Korean Patent Publication No. 96-4914 discloses a method for preparing a waterproof fabric by coating a fabric with a polyurethane resin film having a glass transition temperature of -20 to 20 ° C. and having an ethylene oxide unit of 7.0 mol / kg or more. The environmentally compatible functionality of the moisture-permeable waterproof fabric prepared in this way can be improved to some extent, but since there is only one type of polyurethane resin forming the coating layer, the glass transition temperature of the polyurethane resin is also selected from the range of -20 to 20 ° C. It is bound to the dog's temperature. That is, the standard for determining whether the external environment is high or low temperature is fixed to one in order to control the warmth and moisture permeability of the moisture permeable waterproof fabric. As a result, there is a problem that can not respond efficiently to sensitive environmental changes.

The present invention is excellent in water resistance and moisture permeability by solving the problems of the prior art described above, in particular, excellent in the environmental response function, the heat insulation at high temperature, the moisture permeability at high temperature, the moisture permeable waterproof can always feel comfortable in any environmental conditions To provide a fabric.

The present invention relates to a waterproof fabric and a method for producing the same. In more detail, the present invention relates to a water-repellent waterproof fabric and an excellent method for controlling moisture permeability and warmth (hereinafter referred to as "environmental response function") corresponding to cold and heat sensation, and a manufacturing method thereof.

In order to achieve the above object, the present invention includes two or more hydrophilic non-porous polyurethane films having respective glass transition temperatures in the range of -10 to 30 ° C. but having a temperature difference of 5 to 30 ° C. between glass transition temperatures. Provides a moisture-proof waterproof fabric laminated to.

In order to achieve the above object, the present invention includes two types of glass transition temperatures in the range of -10 to 30 ° C., but each of the polyurethane resins having a temperature difference of 5 to 30 ° C. between the glass transition temperatures is applied to a release paper. After the hydrophilic non-porous polyurethane film is prepared, a method of manufacturing a moisture-permeable waterproof fabric is provided by laminating them on a fabric.

The present invention also provides a method of manufacturing a moisture-permeable waterproof fabric by coating two or more layers of the polyurethane resin directly on a fabric.

In the present invention, the hydrophilic non-porous polyurethane membrane maintains a rigid structure of the molecular chain in an environment below the glass transition temperature, thereby restricting water vapor or heat transfer, but in an environment above the glass transition temperature, the molecular chain performs a constant thermal behavior in the longitudinal direction. By producing random porosity and molecular pores several times smaller than micropores in the molecular structure by continuously twisting and overlapping (micro Brownian motion), we produce a waterproof fabric which is particularly excellent in environmental response function by focusing on the principle of promoting the movement of heat and water vapor. .

The present invention will be described in more detail.

The polyurethane resins used in the present invention have a glass transition temperature (Tg) of −10 to 30 ° C. and a glass transition temperature difference between the polyurethane resins laminated together on the fabric is 5 to 30 ° C.

If the difference in the glass transition temperature between the polyurethane resins is too small, the environmental response function is expressed only in an extremely narrow range of environmental changes that may occur when wearing clothing. Therefore, in order to express the excellent environmental response function in all environmental conditions that may occur during clothing, many layers of polyurethane film should be laminated on the fabric, but in this case, manufacturing cost increases and workability and touch are degraded. there is a problem.

On the other hand, if the glass transition temperature difference is too large, the temperature range in which the thermal behavior of the polyurethane resin changes is increased, so that it is impossible to obtain an environmental response function that reacts sensitively to changes in ordinary environments.

On the other hand, when the glass transition temperature of the polyurethane resin is higher than the range of the present invention, the touch of the polyurethane film becomes very hard, which makes it unsuitable for producing a moisture-permeable waterproof fabric. Such polyurethane resins can be prepared by conventional methods of reacting isocyanates, polyols and chain extenders.

The material of the fabric useful in the present invention may be chemical fibers such as polyester, polyamide, acrylic and rayon, or natural fibers such as cotton or wool, or a mixture thereof, and they may be one of woven, knitted or nonwoven fabrics. .

Although the glass transition temperatures are in the range of -10 to 30 ° C., two or more polyurethane resins having a temperature difference of 5 to 30 ° C. between the glass transition temperatures are dissolved in a volatile organic solvent in a separate process to prepare a coating solution. And these are apply | coated to each release paper in thickness of 5-10 micrometers, and it fully dries at 120-130 degreeC for 1 minute, and manufactures 2 or more types of polyurethane films.

As the volatile solvent, toluene, methyl ethyl ketone, isopropyl alcohol, dimethylformamide and the like are preferably used. Moreover, an ultraviolet hops agent, antioxidant, a foaming agent, etc. can be added to a resin solution. Moreover, an isocyanate type crosslinking agent, surfactant, etc. can be added to a resin solution.

Isocyanate-based crosslinking agent forms a crosslinked structure in the film as a heat treatment after film formation, thereby contributing to the strength and durability of the film.

After the adhesive resin is added to the two or more kinds of polyurethane films thus prepared, these films are adhered to at least one side of the fabric, and then the release paper is peeled off, thereby forming two or more polyurethane film layers on the fabric. The order of laminating two or more kinds of polyurethane films on the fabric may be arbitrarily selected.

In another method, the polyurethane resin is coated directly on two or more layers of the fabric to prepare a waterproof waterproof fabric of the present invention. That is, one type of polyurethane resin is directly coated on a fabric and then dried, and then another type of polyurethane resin is coated and dried thereon.

The moisture-permeable waterproof fabric of the present invention prepared by the above-described method includes two or more hydrophilic non-porous polyurethanes having respective glass transition temperatures in the range of -10 to 30 ° C. but having a temperature difference of 5 to 30 ° C. between the glass transition temperatures. The films are stacked on the fabric.

The moisture-permeable waterproof fabric of the present invention is excellent in water resistance and moisture permeability, and in particular, excellent in environmental response functionality, so that the heat retention at low temperatures is improved at high temperatures.

For example, a hydrophilic non-porous polyurethane film having a glass transition temperature of 5 ° C. (hereinafter referred to as film I) and a hydrophilic non-porous polyurethane film having a glass transition temperature of 15 ° C. (hereinafter referred to as film II) are in any order. In the case of the moisture-permeable waterproof fabric laminated on the fabric, when the external temperature is lower than the glass transition temperature of 5 ° C., the resins of the film (I) and the film (II) maintain the rigid molecular structure. Thermal insulation of waterproof fabric is improved. In addition, when the external temperature is higher than the glass transition temperature of the film (I) but lower than the glass transition temperature of the film (II), the molecules in the resin of the film (I) have active thermal behavior, but the resin of the film (II) is the rigid molecule. By maintaining the structure, the waterproof fabric will maintain the proper insulation and moisture permeability. In addition, when the outside temperature is higher than the glass transition temperature of the film (II), the molecules in the resin of the film (I) and the film (II) undergo active thermal behavior, thereby improving the moisture permeability of the moisture permeable waterproof fabric.

In this way, the moisture-proof waterproof fabric of the present invention will always express comfortable wearing while controlling moisture permeability and warmth according to external environmental conditions.

The moisture permeable waterproof fabric of the present invention has a moisture permeability of 2,000 g / m 2 · 24 hours or less in a low temperature environment, and a moisture permeability of 6,000 g / m 2 · 24 hours or more in a high temperature environment. The low temperature environment is 10 ° C. or less at the temperature around the polyurethane coating layer in the moisture-permeable waterproof fabric constituting the garment, and the high temperature environment is 40-50 ° C. at the temperature around the polyurethane coating layer in the moisture-proof waterproof fabric constituting the clothing.

In the present invention, the moisture permeability is measured by the JlS-L 1099 method, and the water pressure is measured by the JlS-L 1096 method. Thermal insulation is measured using a thermal mannequin at 20 ℃, RH 60% conditions.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the examples.

Example 1

The coating solution prepared in the following composition ratio is coated on a release paper with a thickness of 10 μm using an overroll knife, and then heat-treated at 120 ° C. for 1 minute to prepare a polyurethane film (I).

------- Composition (Ⅰ) -------

Hydrophilic Polyurethane (Glass Transition Temperature 8 ℃) 100 parts

White pigment part 10

2 parts of silica

Methyl ethyl ketone 60 parts

Meanwhile, the coating liquid prepared in the following composition ratio was coated on a release paper with a thickness of 10 μm using an overroll knife, and then heat-treated at 120 ° C. for 1 minute to prepare a polyurethane film (II).

------- Composition (Ⅱ) -------

Hydrophilic Polyurethane (glass transition temperature 15 ℃) 100 parts

White pigment part 10

2 parts of silica

Methyl ethyl ketone 60 parts

Meanwhile, the coating solution prepared in the following composition ratio was coated on a release paper with a thickness of 10 μm using an overroll knife, and then heat-treated at 120 ° C. for 1 minute to prepare a polyurethane film (III).

------- Composition (Ⅲ) -------

Hydrophilic Polyurethane (Glass Transition Temperature 25 ℃) 100 parts

White pigment part 10

2 parts of silica

Methyl ethyl ketone 60 parts

Each of the polyurethane films produced by the above method was laminated on the nylon taffeta fabric in the order of the film (III) -film (II) -film (I) by the dot laminating method to produce a moisture-repellent fabric.

Example 2

A moisture-permeable waterproof fabric was prepared in the same manner as in Example 1 except that the stacking order of the polyurethane films was laminated on the original fabric in the order of the film (I) -film (II) -film (III).

Example 3

A moisture-permeable waterproof fabric was prepared in the same manner as in Example 1 except that the film (I) was not laminated.

Example 4

A moisture-permeable waterproof fabric was prepared in the same manner as in Example 1 except that the film (II) was not laminated.

Example 5

A water-permeable waterproof fabric was prepared in the same manner as in Example 1 except that the film (III) was not laminated.

Example 6

The polyurethane coating solution of composition (I) was directly coated on a fabric with a thickness of 10 μm, and then dried by heat treatment at 120 ° C. for 1 minute. After coating the polyurethane coating liquid of composition (III) on the coating layer to a thickness of 10 ㎛ and heat-treated for 1 minute at 120 ℃ to prepare a waterproof waterproof fabric.

Comparative Example 1

Using a hydrophilic polyurethane having a glass transition temperature of -12 ° C., the coating solution was formed as follows, and then a polyurethane film was prepared by coating the release paper with a thickness of 30 μm using an overroll knife. Dot laminating on to prepare a moisture-proof waterproof fabric.

-------Composition (II) -------

Hydrophilic Polyurethane (Glass Transition Temperature -12 ℃) 100 parts

White pigment part 10

2 parts of silica

Methyl ethyl ketone 60 parts

Comparative Example 2

A moisture-permeable waterproof fabric was prepared in the same manner as in Comparative Example 1 except that a hydrophilic polyurethane having a glass transition temperature of 35 ° C was used.

Table 1 shows the results of evaluating the water resistance, moisture permeability, and thermal insulation of the moisture-permeable waterproof fabric prepared in the above Examples and Comparative Examples.

Table 1

The moisture permeable waterproof fabric according to the present invention maintains warmth by inhibiting the movement of water vapor, that is, the movement of latent heat at a low temperature, and actively prevents moisture by releasing latent heat by actively passing water vapor at a high temperature. Prevent temperature rise.

Therefore, when the moisture-permeable waterproof fabric of the present invention is used in windproof facilities, ski clothes, work clothes, shoes, etc., it is waterproof and rich in warmth when the body does not get warm before or during exercise, and when the body is warm during exercise or after exercise. High water vapor permeability and no moisture can make cool and comfortable garment material.

Claims (4)

A water-permeable waterproof fabric in which two or more hydrophilic non-porous polyurethane films each having a glass transition temperature in a range of -10 to 30 ° C but having a temperature difference of 5 to 30 ° C between glass transition temperatures are laminated on a fabric. The moisture permeable waterproof fabric of claim 1, wherein the moisture permeability in a low temperature environment is 2,000 g / m 2 · 24 hours or less, and the moisture permeability in a high temperature environment is 6,000 g / m 2 · 24 hours or more. Two or more hydrophilic non-porous polyurethane films were prepared by applying polyurethane resins having glass transition temperatures in the range of -10 to 30 ° C but having a temperature difference of 5 to 30 ° C between glass transitions on a release paper, respectively. After that, they are laminated on a fabric. Preparation of moisture-permeable waterproof fabric, characterized in that each glass transition temperature is included in the range of -10 ~ 30 ℃ but the polyurethane resin having a temperature difference of 5 ~ 30 ℃ between the glass transition temperature is coated on two or more layers on the fabric Way.