JPS6375183A - Waterproof moisture permeable cloth - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a novel waterproof and breathable fabric.

(Prior Art) Various types of waterproof and moisture-permeable fabrics made of sheeted polyurethane resin have been proposed.

Conventional methods for heating include (1) simply applying a water-repellent finish to high-density fabrics; The fabrics obtained by this method have good moisture permeability and feel, but have insufficient water pressure resistance, and have the disadvantage that waterproof performance deteriorates due to repeated washing, dry cleaning, etc.

Other methods that have traditionally been used include ■Polyurethane,
This is a method in which a film of polytetrafluoroethylene resin or the like is laminated onto a fabric.

The product obtained by this method has a waterproof performance of 1+o
Although it is very good at OO ~ 5,000 tmHρ/d, its moisture permeability is significantly lower than that of the base fabric itself (moisture permeability before lamination), and in some cases it is 3,000 ~ 6,00 tmHρ/d.
0,! This results in a decrease of i'/m''/24hr. Also, since the product IJ is 7 I/Lm, the texture becomes hard, and due to the characteristics of the film surface, the texture exhibits a rubbery feel.

Another method is to coat a fabric with a solution of a resin such as acrylic resin, polyurethane resin, silicone resin, etc. in an organic solvent and then dry it to make a waterproof fabric.

In the waterproof fabric obtained by this method, it is difficult to make the coating layer microporous, and its moisture permeability is significantly lower than that of the base fabric, and the moisture permeability of the resulting coated fabric is 4ooog/m '/24hr or more is also low.

Furthermore, as another method, 1. After applying an organic solvent solution of polyurethane resin to the base fabric, immersing it in water,
There is a method of obtaining the resin by wet coagulation. (For example, Japanese Unexamined Patent Application Publication No. 55-80583.) The fabric obtained by this method shows relatively little decrease in moisture permeability of the fabric after coating the base fabric, but maintains waterproof performance to a high level (for example, , 1000 nH, 0/csi), it is necessary to make the thickness of the coating layer 30 p++s or more, which has the disadvantage that the resin layer becomes thick, giving it a rubbery feel.

(Objective of the Invention) The object of the present invention is to improve such conventional drawbacks, and in addition to good waterproofing and moisture permeability, it also improves the rubbery feel that this type of fabric has traditionally had. The purpose of the present invention is to propose a waterproof/breathable fabric with a good texture.

(Structure of the Invention) The present invention provides a footing fabric in which one surface of a base fabric is coated with a microporous polyurethane resin, and one side of the coated fabric has water repellency, and The coating fabric has an initial water pressure resistance of looOmHρ/d or more, and the base fabric has a moisture permeability of 6 + 0009.
/ m /24 hr or more, and the rate of decrease in the moisture permeability of the fabric after coating is 30% or less, and the surface coated with the microporous polyurethane resin has spherical convex portions with a diameter of 10 mm or less. A waterproof and moisture permeable fabric characterized by having an uneven structure including:

The base fabric used in the present invention has a moisture permeability of 5000, F/
m”/24hr or more.

As the material of the thread constituting the base fabric, commonly used materials such as polyester and polyamide can be used.As the base fabric, any of the nine knitted woven fabrics can be used, but a woven fabric with a plain weave structure is preferable. For example:

One side of the fabric of the present invention has water repellency, and
The initial water pressure resistance is 100+)+wHρ/- or more, and the other side of the footing fabric is coated with microporous polyurethane resin, and the rate of decrease in moisture permeability after coating is 30%. It is as follows.

In the present invention, the coating surface is coated with a microporous polyurethane resin, and the aE-coated surface has a diameter of 10 μm.
It is important to have a convex-concave structure including the following spherical convex portions.

FIG. 1 is a U-shaped mirror photograph showing the state of the resin-coated surface of the waterproof and moisture-permeable fabric of the present invention, and a large number of spherical convex portions are distributed on the coating surface. The number of spherical convex portions is preferably 10/l, 000 μm or more. Further, the minimum thickness of the microporous polyurethane resin layer is preferably 20 μm or less. The minimum thickness of the resin layer is determined by cutting the waterproof and moisture permeable fabric parallel to the thickness direction, and measuring the thickness of the resin layer from the cut surface.

Specifically, a micrograph of the cut surface (magnification: 200 to 5
00 times) to measure its thickness. Since the base fabric generally has an uneven structure,
The resin layer has a variation in thickness.

The minimum thickness of the resin layer refers to the thickness of the resin layer at the convex portions on the surface of the base fabric.

Such a coating fabric is prepared by dissolving a polymer mainly composed of polyurethane in a diluting solvent, adding water to form a water-in-oil dispersion, and adding a resin crosslinking agent and the like to form a coating resin liquid.

Next, this resin liquid is applied to a fabric that has been subjected to a water-repellent treatment and, if necessary, a calendar treatment, using a knife footing machine. Next is the solvent.

The microporous coated fabric of the present invention is obtained by sequentially evaporating the water.

As the polyurethane polymer used in the present invention, polyester-based or polyether-based polyurethane polymers can be considered, and these polymers are those that form a microporous film by dry coagulation. As the resin crosslinking agent, polyincyanates are used, and examples of the polyincyanates include those having two or more incyanate groups such as diisocyanates and triisocyanates. Further, as the diluting solvent, known ones can be used, and those that can be made into a dispersion by adding water are used.

The resin layer of the resulting coating fabric is microporous and has many fine pores on the surface, and the inside of the resin layer has connecting pores that communicate with the fine pores. It is something.

Further, in the water repellent treatment, any water repellent such as fluorine type or silicone type is used, and the amount of water repellent applied to the base material is in the range of 0.5 to 2.0 weight.

(Action of the invention) Even with the coated fabric made of microporous polyurethane resin that has been proposed so far, the water pressure resistance is 1000 mHρ/c.
II and above have been proposed.

However, in conventional fabrics, the resin layer needs to be sufficiently thick in order to obtain the water pressure resistance, and its surface is also microporous, so the texture of the resulting fabric is similar to that of rubber. This is the case.

The surface of the fabric of the present invention has an uneven structure including spherical convex portions as described above, and the thickness of the tree nMA can be made thinner, so it is drier and more basic than conventional waterproof and moisture permeable fabrics. A texture similar to that of cloth can be obtained. The spherical convex portions formed on the surface of the fabric of the present invention are formed by using the resin liquid from a water-in-oil dispersion plate as the coating resin liquid during coating, without destroying the dispersion state. This is thought to be because it can be fixed to the surface.

As described above, the fabric according to the present invention can significantly improve the feel of the fabric due to the surface characteristics of the spherical convex portions formed on the surface.

(Example 1) Polyester processed yarn 75 denier (72 filament)
was used for the warp and weft to create a plain weave. (Meridian density 1
(24 threads/2.54cm, weft density 94 threads/2.54cm) This fabric was made in the same way as a normal polyester processed yarn fabric.
After scouring, dyeing, washing, drying and setting, water repellency treatment was carried out using a treatment agent with the following formulation by a conventional padding method to obtain a water repellent polyester processed yarn fabric.

(1) Elm sipe before water repellency Next, a coating resin solution (viscosity: 22,500 7 inch poise) having the following resin formulation was uniformly applied to the polyester processed yarn fabric using a knife coating method. After application lOO
Drying was carried out through a hot air dryer having a temperature gradient from °C to 120 °C. The amount of resin applied after drying the fabric is 7.21
/rt. Further, the minimum thickness of the broken resin layer on the surface of the fabric was about 12 μm at most.

(2) Resin liquid for coating Sipe Sample U
E-100ON (manufactured by Sanyo Chemical Industries) 100 parts Soltex PX-105 (manufactured by Dainippon Ink) 3
0 parts methyl ethyl ketone
20 parts toluene
20 parts Soltex CL-10 (manufactured by Dainippon Ink)
Part 1 7 Sister FX-3 (Dainippon Inn Misaki y
4) 1 part water
Table 1 shows the performance of 50 parts of the obtained waterproof and moisture permeable fabric.

The performance of the base fabric before coating and after water-repellent treatment is also shown.

Table 1 The obtained waterproof and moisture permeable fabric has a large number of spherical convex portions distributed on the coated surface, and has poor texture despite having excellent waterproof and moisture permeability as shown in Table 1. was obtained as a fabric with less rubbery feel and a dry touch.

(Actual Example 2) Dividable laminated composite fiber 75 denier, 20 denier, using polyethylene terephthalate 75f Neal 72 filament multifilament yarn for the warp, and containing polyethylene terephthalate and nylon-6 at a ratio of 1:1 for the weft. High-density plain woven fabric (320 filaments after splitting, single yarn denier 0.23 denier after splitting)
Density: 122/2.54>,! $'Me
92$/2.54v) was divided and processed and then heat set at a temperature of 180° C. for 45 seconds to obtain a fabric for dyeing.

Dyeing was carried out in a conventional manner using conventional disperse dyes at a temperature of 130 DEG C., soaped and dried.

After drying, water-repellent treatment was performed in the same manner as described in Example 1, and calender treatment was performed at a temperature of 160° C. to obtain a base fabric for coating.

, coating and drying after coating were carried out in the same manner as described in Implementation IK.

How much resin should be applied after drying the fabric? ,0)/ze was.

Further, the minimum thickness of the resin 1 covering the surface of the fabric was about 13 μm.

The performance of the obtained waterproof and breathable fabric is shown in Table 2.

Table 2 The obtained waterproof and moisture permeable fabric had a dry touch without a rubbery feel. In addition, a large number of spherical convex portions were distributed on the coated surface, contributing to improved hand feel.

In addition, the measurement of moisture permeability is based on JIS-2-0208 (cup method) K, and the measurement of water pressure resistance is based on JIS-L-1092 (
The test was carried out in accordance with Law A).

[Brief explanation of the drawing]

FIG. 1 is a photomicrograph showing the state of the resin-coated surface of the waterproof and moisture-permeable fabric of the present invention.

Claims (1)

[Scope of Claims] 1. A coated fabric in which one surface of a base fabric is coated with a microporous polyurethane resin, wherein one side of the coated fabric is water repellent; The initial water pressure resistance is 1000mmH_2O/c
m^3 or more and the moisture permeability of the base fabric is 6,000
g/m^3/24hr or more, and the rate of decrease in moisture permeability of the fabric after coating is 30% or less,
The coated surface of the microporous polyurethane resin has a diameter of 10 μm.
A waterproof and moisture-permeable fabric characterized by having an uneven structure including the following spherical convex portions. 2. The minimum thickness of the microporous polyurethane resin coating layer is 20
The fabric according to claim 1, which has a diameter of μm or less.