JPH07279059A - Processed cloth provided with moisture permeability and water repellency - Google Patents

Abstract

PURPOSE:To obtain processed cloth having excellent durable water repellency and moisture permeability, flexibility of filaments of cloth, by immersing cloth in a silicone resin solution and heat-treating without impairing moisture permeability. CONSTITUTION:Foundation cloth is immersed in a first silicone resin solution not containing a cross-linking agent under negative pressure, then in a second silicone resin solution containing a cross-linking agent under normal pressure and successively heated. Consequently, an uncured silicone resin 8 is impregnated into gaps of filaments of the foundation cloth, the gaps of the lattices of the foundation cloth are filled with a silicone resin 9 to provide processed cloth having excellent moisture permeability and durable water repellency and leaving flexibility in the filaments of the cloth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processed cloth obtained by stepwise dipping a cloth in a silicone rubber resin and imparting moisture permeable and durable water repellency, which is particularly suitable for clothing. Is.

[0002]

2. Description of the Related Art Nylon, polyester, aramid or
Using textiles such as cotton or cloth such as knit as the base fabric,
Silicone rubber, silicone modified EPT and fluorosili
Immerse under a negative pressure in a resin liquid containing Kon as a main component,
After removing the excess resin liquid and then crosslinking it,
Combined with the properties of corn rubber, 500-3000 g / m
²・ Moisture permeability of about 24 hr and about 500-1500 mm
A work cloth having a degree of water pressure resistance can be obtained. This processed cloth is
Generally called a breathable water repellent cloth, rain clothes, windbucks
Used as a suitable material for clothing such as lakers and sleeping bags,
This technology has already been applied by the applicant
(Japanese Patent Application No. 3-58322). The breathability and first of this processed cloth
Water repellency before repeated washing (hereinafter referred to as "initial water repellency")
Is that this is a satisfactory material for clothing.
It However, when used for clothing, it is water repellent.
Not only has high initial water repellency, but also better wash resistance
And wear resistance (hereinafter referred to as "durable water repellent")
desired. This durable water repellent is JIS L 0217.10.
3 and JIS L 1092 test method, H
L50, about 80, that is, initial water repellency after washing 50 times
Is reduced from 100 to 80, so this durable water repellent
However, there is still room for improvement. Also, the above processing
Depending on the type of base fabric used, the fabric may have rigidity.
If this is used for clothing, the wearer
Move loudly, it may make loud noises (thread noise or strange noise).
Therefore, we hope that this will be resolved and the texture will be further improved.
Get caught

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The inventors of the present invention have conducted research to improve the above-mentioned processed cloth, and as a result, first found out the following facts. That is, in the technical method of the above-mentioned application, in the processed base cloth, the silicone resin liquid penetrates into the fine gaps between the filaments of the base cloth and sufficiently fills them, but the lattice gaps of the base cloth are , There is still room for filling, and the filling degree of this lattice gap is closely related to water and water repellency, and the higher the filling degree of the lattice gap,
It is also water repellent.

Further, the present inventors have found that when the minute gaps between the filaments of the base cloth are filled with the silicone rubber resin liquid,
The filament of this processed cloth loses flexibility, and when it is used for clothing, the filament of the base cloth bends due to the angular movement with the movement of the wearer, and the movement due to the impact resilience at this time is not audible. I knew that it would sound.

Based on the above consideration, the present invention is excellent in that the filament gap and the lattice gap of the base cloth are filled with silicone resin while leaving the flexibility (degree of freedom) in the filament of the base cloth. It is an object to obtain a processed cloth having excellent moisture permeability, durable water repellency and good texture.

[0006]

According to the present invention, in order to fill a gap between filaments of a base cloth and a lattice gap of the base cloth with a silicone resin, the base cloth is immersed in a silicone resin liquid. The above problem was solved by performing the second processing step by step.

Further, according to the present invention, even when the gap between the filaments of the base cloth is impregnated with the silicone rubber resin, the filament is prevented from losing its flexibility. Therefore, the crosslinking treatment is not added in the first treatment. The above problem was solved by impregnating the present invention with a so-called first silicone resin liquid, and by impregnating the present invention to which a crosslinking agent was added with a so-called second silicone resin liquid in the second treatment.

The present invention further provides a vulcanization-curable fluorinated water repellent diluted with a solvent in the first silicone resin liquid or the first and second silicone resin liquids (hereinafter referred to as "fluorine water repellent"). By adding a required amount of (solvent solution)), not only the initial water repellency but also the durable water repellency is improved, thereby solving the above problems.

Furthermore, the present invention is the same as the above after the base cloth is dipped stepwise in the first and second silicone resin liquids respectively containing the fluorine-based water repellent solvent solution. By dipping in a solvent solution of a fluorinated water repellent, the initial water repellency as well as the durable water repellency were remarkably improved, thereby solving the above problems.

The present invention is based on a woven or knitted fabric made of a natural or synthetic resin or a blend thereof, which does not contain a crosslinking agent and contains or does not contain a fluorine-based water repellent solvent solution. A first treatment is performed in which the above-mentioned base fabric is immersed in a silicone resin liquid under negative pressure (impregnation of the base fabric with a pressure cell provided in the front part of the base fabric and a vacuum suction cell in the rear part).

Next, the base cloth which has been subjected to the above-mentioned first treatment contains a cross-linking agent and a fluorine-based water repellent solvent solution, or
Alternatively, the second treatment is performed by immersing the second silicone resin liquid not containing it under normal pressure.

Next, the base cloth treated with the first and second treatments is heat-treated to crosslink the silicone resin to obtain a processed cloth, or the base cloth treated with the second treatment is Furthermore, after performing a third treatment of immersing in a fluorine-based water repellent solvent solution, heat treatment is performed to crosslink the silicone rubber to obtain a work cloth.

The present invention will be described with reference to the drawings. FIG. 1 is a sectional view in which the base cloth 3 is resin-processed. Generally, when a fiber (fabric) is treated with a resorcinol formalin, urea formalin or melamine formalin resin and heated, the above resin adheres to the surfaces of the weft 1 and the warp 2, and the contact points of the weft and the warp are point-bonded. The surface of the fiber becomes hard and the feeling is impaired. Moreover, the degree of freedom of the point-bonded portion of the contact points of the weft and the warp is lost, and the fiber becomes stiff, and there is a problem in air permeability. The same phenomenon occurs when the base cloth is impregnated with a chemical in which a crosslinking agent is added to a silicone resin.

FIG. 2 is a schematic sectional view of an apparatus for impregnating a base cloth with a silicone resin without a crosslinking agent according to the present invention. Long base cloth 3 impregnated with silicone resin (usually around 50 m)
A synthetic resin film is wrapped around the outer periphery of the, and placed in a container for vacuum suction, and the pressure cell 5 inserted in the front portion 3a of the base cloth is pressed by the pressurizer P to facilitate vacuum suction of the silicone resin impregnating liquid. Close. A vacuum cell is provided on the rear portion 3b of the base cloth, and a silicone resin solvent solution (aqueous solution or non-aqueous solution) is applied by a vacuum pump V.
The solvent (water-soluble solvent or non-water-soluble solvent) is sucked to form only the silicone resin film on the base cloth. The film formation of the silicone resin (without a cross-linking agent) on the base fabric of the present invention is several times superior to the impregnation heating method of the silicone resin solution under normal pressure. In the present invention, the reason why the solution of the silicone resin solution (without a crosslinking agent) is sucked by the vacuum pump is to facilitate the formation of the silicone film on the base cloth. In the present invention, the reason why only the silicone resin film is formed on the base cloth and the crosslinking agent is not added is to maintain the flexibility of the base cloth.

The present invention will be described with a micrograph. FIG. 4 is a 200 times photograph of the current rubberized cloth. Only the surface of the fibers of the current rubberized cloth is coated with the synthetic resin, and the resin does not penetrate into the inside of the fibers. FIG. 5 is a 200 × photomicrograph of the present invention. By impregnation suction with a vacuum pump, the formation of a film of silicone resin inside the fiber can be seen. It can be seen that the film formation of the silicone resin on the inside of the fiber leads to the improvement of the feeling and the improvement of the washing resistance.

FIG. 3 is a cross-sectional view of the base fabric after the first and second treatments of the silicone resin of the present invention. The first silicone resin solution (without a cross-linking agent) is vacuum-sucked onto the base fabric 3 to form a film, and then a fluororesin is added to the silicone resin in order to impart moisture permeability and water repellency to the solvent and the cross-linking agent. The second silicone resin liquid added with is soaked in the first silicone resin-treated base cloth and heated to form a fluorine-silicone resin film on the base cloth. It was a successful one.

The processed cloth of the present invention is obtained as described above. In the present invention, the filament of the base cloth, the silicone resin impregnated into the gaps of the lattice and the silicone resin coating the surface layer of the filament are particularly limited. However, it may be arbitrarily selected from those conventionally used. However, dimethyl vinyl silicone raw rubber is generally preferred. In addition, those obtained by graft-polymerizing acrylic resin on silicone resin, fluorosilicone resin, EPDM modified with silicone resin, and the like can be mentioned as those which can be sufficiently used.

The silicone rubber paste is usually a silicone resin dissolved in a suitable organic solvent,
The first silicone resin liquid contains a silica-based reinforcing filler, a flame retardant, a moisture permeability increasing agent, a coloring agent and the like as a filler but does not contain a crosslinking agent.

The second silicone rubber paste is the above-mentioned silicone resin containing a crosslinking agent.

The water-repellent agent added to the first and second silicone rubber pastes and the water-repellent agent used in the third treatment are solvent-based vulcanization-curable fluorine-based water-repellent agents, that is, fluorine-based water-repellent agents. An agent-solvent solution is suitable, and the amount added to the silicone rubber paste is 0.5 to 10 phr, and the water repellent for dipping the base cloth in the third treatment is 0.5 to 10%. Concentrations of water repellents to be added to the silicone resin liquid and concentrations of the water repellents to immerse the base cloth are selected according to the durable water repellent performance required for the work cloth.

As the above flame retardant, cerium oxide, antimony oxide and the like can be listed as those having high flame retardancy.

Examples of the moisture permeability improving agent include cellulose powder, protein, collagen, zeolite polar,
Mica, SUS flakes and light coal can be listed.

As the fibers used in the present invention, nylon, aromatic polyamide, polyester, acrylic, polypropylene, cotton, rayon and the like are used without any particular limitation. As the fineness, those having a denier of 30 to 2520 can be used, and those having monofilaments, multifilaments or crimped fibers can be used. Further, a plain weave or a twill weave fabric can be applied, and a raised fabric cloth can be used depending on the application. The thickness of the base cloth is generally 0.
A range of 10 to 4.00 mm can be applied.

When the first treatment of the present invention is performed by vacuum suction under negative pressure, the first silicone resin containing no crosslinking agent is sufficiently permeated and contained in the gaps between the filaments constituting the yarn of the base cloth. . On the other hand, when the second treatment is applied under normal pressure, the second silicone resin containing the cross-linking agent coats the surface of the yarn of the base fabric and is filled in the lattice gaps and cured. Provides durable water repellency as well as wetness. Further, the second treatment protects the non-crosslinked silicone rubber contained in the gaps between the filaments and increases the water pressure resistance of the work cloth.

In the present invention, when the fluorine-based water repellent solvent solution is added to the first silicone resin liquid or the first and second silicone resin liquids, the durable water repellency of the work cloth is further enhanced.

In the present invention, the base cloth is treated in the silicone resin solution containing the fluorine-based water repellent solvent solution described above, and then immersed in the fluorine-based water repellent solvent solution. Remarkably enhances durable water repellency.

The addition of a fluorine-based water repellent solvent solution to the silicone resin solution and the third step of dipping in the fluorine-based water repellent solvent solution are the durable repellent properties required for the work cloth. It is a means arbitrarily taken depending on the water performance.

[0028]

EXAMPLES Examples of the present invention will be described in detail below.

Preparation of the first silicone resin liquid. Silicone resin DX-38-068 (manufactured by Toray Dow Corning Silicone Co., Ltd.) was dissolved in toluene to obtain a solid content of 10
% Silicone resin solution was prepared. First process. The first silicone resin solution is placed in a vacuum tank, and each of the three types of base fabrics A, B, and C described below is individually immersed while being rolled, and a negative pressure of 700 mmHg is applied at 25 ° C. for 60 minutes. Was given. Preparation of second silicone resin liquid. The same silicone resin DX-38-068 as described above is dissolved in toluol, and SRX-212 (Toray Dow Corning
0.6 parts by weight of Silicone Co., Ltd., to obtain a solid content of 10
% Silicone resin solution was prepared. Second process. Each of the base fabrics subjected to the first treatment was individually immersed in the second silicone resin liquid for 2 minutes while continuously being fed, and excess silicone resin liquid was squeezed by a roll. Heat treatment. Each of the base fabrics subjected to the second treatment is
In a hot atmosphere of 0 ° C., the work cloth was obtained by heating while passing it individually for 2 minutes.

[0030]

Example 2 Preparation of first silicone resin liquid. Fluorine-based water repellent solvent solution, Dikgard NH10 (manufactured by Dainippon Ink and Chemicals, Inc.) in the first silicone resin liquid in Example 1 above.
Was added and stirred to prepare a first silicone resin liquid. First process. Using the first silicone resin liquid, the same three kinds of base cloth as in the above Example 1 were individually subjected to the same processing as that of the same Example and the first processing. Preparation of second silicone resin liquid. The same liquid as the second silicone resin liquid in Example 1 was prepared. Second process. Each of the base fabrics subjected to the first treatment was subjected to the same treatment as the second treatment in the above Example 1 using the second silicone resin liquid. Heat treatment. Example 1 was applied to each of the base fabrics subjected to the second treatment.
The same heat treatment as in 1 was applied individually to obtain a work cloth.

[0031]

Example 3 Preparation of first silicone resin liquid. The same liquid as the first silicone resin liquid in Example 2 was prepared. First process. Using the first silicone resin liquid, each of the same three kinds of base fabrics as in Examples 1 and 2 was individually subjected to the same treatment as the first treatment of the same example. Preparation of second silicone resin liquid. To the second silicone resin liquid in Examples 1 and 2 above, 1% of a fluorine-based water repellent solvent solution, Dikgard NH10 (manufactured by Dainippon Ink and Chemicals, Inc.) was added and stirred to form the second silicone resin liquid. It was adjusted. Second process. Each of the base fabrics subjected to the first treatment was subjected to the same treatment as the second treatment in Examples 1 and 2 using the second silicone resin liquid. Heat treatment. The same heat treatment as in Examples 1 and 2 was applied to each of the base fabrics subjected to the first and second treatments.
It was applied individually to obtain a processed cloth.

[0032]

[Embodiment 4] The excess water repellent was immersed in a 1% fluorine-based water repellent solvent solution for 2 minutes under normal pressure while sending each base cloth subjected to the second treatment in the above-mentioned Example 3. The agent was squeezed out, and then each of these base fabrics was passed through a hot atmosphere of 180 ° C. for 2 minutes while being passed to obtain a work fabric.

Comparative Example. The same silicone resin DX-38-068 as in each of Examples 1 to 4 was dissolved in toluol, and SRX212 of 0.
A silicone resin solution having a solid content of 10% was prepared by adding 6 parts, placed in a vacuum tank, and each of the above three kinds of base fabrics was individually immersed in the roll while being rolled.
The pressure was reduced to 700 mmHg at 5 ° C. for 60 minutes, and then these were heat-treated at 160 ° C. for 1 minute to obtain a work cloth.

[0034]

[Table 1]

Table 1 above shows the physical properties of the work cloths obtained in Examples 4 to 4 and Comparative Example. The physical properties shown in Table 1 are obtained by the following methods. Initial water repellency: According to JIS L 1092. Durable water repellency: Shows water repellency after washing, JIS L 021
7. Washed according to the method 7.103 and tested for water repellency according to JIS L 1092 method. In the table, the number of washings / 80 points is 80
The point, that is, the number of times of washing until the water repellency grade becomes Class 3 is shown. Water vapor transmission rate: JIS L 1099. According to the A-1 method. Water leakage: JIS L 1092. An evaluation method specific to the present invention, which is provided according to the C method (DIN method or Bundesmann method),
Without rotating the Bundesmann method friction element, the rainfall amount is 60
Measured as 0 mm / hr. Note: 1 to 4 marked with * in the table are JIS L 1092
It shows the presence or absence and the extent of a tail with water droplets remaining on the test piece before tapping after being measured by the method. * 1: Yes. * 2: There is a little. * 3: Almost none. * 4: None at all.

[0036]

Industrial Applicability The processed cloth obtained by the present invention has a fine gap between the filaments constituting the yarn of the base cloth,
Silicone resin is thoroughly and completely impregnated, and the surface layer of the yarn and the lattice gaps of the base cloth are covered with the silicone resin to have excellent moisture permeability and durable water repellency. In particular, various fabrics favored for clothing are used as a base fabric, and each of them has satisfactory physical properties and has high durability and water repellency without impairing the moisture permeability essential for clothing.

The work cloth of the present invention obtained by adding the fluorine-based water repellent solvent solution to the first or the first and second silicone resin liquids has a higher durable water repellency without reducing the moisture permeability. It has.

The work cloth of the present invention obtained by immersing in the first and second silicone resin liquids to which the fluorine-based water repellent solvent solution is added and further immersed in the fluorine-based water repellent solvent solution is It has extremely high durability and water repellency without reducing the moisture permeability.

In the present invention, since the silicone rubber impregnated in the fine gaps between the filaments of the base cloth does not contain a crosslinking agent, it does not cure after being heat-treated.
Leaves the filament flexible. Therefore, for example, when this processed cloth is used for clothing, angular bending of the filament is prevented, and no noisy sound is emitted, and the processed cloth has the above-mentioned various physical properties. As a result, it will be supple.

In the present invention, the silicone rubber impregnated between the filaments of the base cloth covers the surface layer and the lattice gap of the yarn of the base cloth by the second treatment even in the case of the unprocessed cloth. Since it is protected by the second silicone resin which has been cured, the physical properties of the work cloth are not deteriorated.

The work cloth of the present invention can have durable water repellency according to the performance required for the application without impairing moisture permeability and water leakage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional synthetic resin-impregnated crosslink.

FIG. 2 is a sectional view of the vacuum suction of the present invention.

FIG. 3 is a cross-sectional view of a moisture-permeable and water-repellent imparted processed cloth of the present invention.

FIG. 4 is a 200 × photomicrograph of a conventional rubberized fabric.

FIG. 5 is a view of a moisture-permeable and water-repellent imparted processed cloth 2 of the present invention.
00x micrograph.

[Explanation of symbols]

 1 Weft 2 Warp 3 Base fabric 3a Base fabric front part 3b Base fabric rear part 3c Silicone resin-impregnated base fabric (without cross-linking agent) 4 Synthetic resin film 5 Pressurizing cell 6 Vacuum cell 7 Cross-linking resin 8 Non-cross-linking resin 9 Fluorine-containing silicone resin (Crosslinking agent included) 10 Vacuum suction container K Crosslinked base fabric M Uncrosslinked base fabric P Pressurizer V Vacuum pump

Claims (4)

[Claims] 1. A woven fabric or knitted fabric made of natural or synthetic fibers or a blend thereof is used as a base fabric, and the base fabric is dipped in a first silicone rubber resin containing no crosslinking agent under negative pressure. The moisture-permeable and water-repellent imparted processed cloth obtained by sequentially performing the treatment 1, treatment 2; dipping in a second silicone rubber resin containing a cross-linking agent under normal pressure and heat treatment. 2. The moisture-permeable and water-repellent imparted processed cloth according to claim 1, wherein the first silicone rubber resin contains a fluorine-based water repellent solvent solution. 3. The moisture-permeable, water-repellent imparted processed cloth according to claim 1, wherein the first and second silicone rubber resins contain a fluorine-based water repellent solvent solution. 4. The method according to claim 1, wherein the second treatment according to claim 1 is followed by a third treatment of immersing in a solvent solution of a fluorine-based water repellent. A breathable, water repellent processed cloth.