JPS59227449A - Textile filled with fluoroplastic - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluororesin composite sheet material. More specifically, both sides of the reinforcing fabric are covered with a pinhole-free fluororesin layer, and the interstices of the fabric are also filled with the fluororesin.
Furthermore, the present invention relates to a resin-filled fabric having excellent chemical resistance, heat resistance, weather resistance, and strength, which is characterized in that the sheet materials can be thermally fused together.

Fluororesin has been used in many fields in recent years as a money-making 7'C resin with characteristics such as excellent chemical resistance, heat resistance, weather resistance, slipperiness, and mold release properties. When used in construction sheet materials, industrial belt materials, etc., resins alone cannot be used because of their insufficient mechanical strength, and composite materials with reinforcing fabrics are being considered.

A widely used method for obtaining a composite sheet material with a reinforcing fabric is to impregnate the fabric's proboscis with a dispersion liquid of tetrafluoroethylene polymer and sinter it. Since mud cracks occur during sintering, the amount of impregnated resin used in each process is kept small and the impregnation and sintering process is repeated several times to reduce the occurrence of mud cracks, but it is not possible to completely eliminate cracks. Have difficulty. In addition, since the impregnation and sintering process is repeated many times, there are many opportunities for dirt to adhere to the product, which can also cause pinholes.

It is difficult to obtain a filled fabric in which the surface of the reinforcing fabric is covered with a fluororesin layer without pinholes. .

On the other hand, there is a method of joining a fluororesin sheet material with a reinforcing fabric via an adhesive, but the composite sheet material obtained by this method has five surfaces covered with a fluororesin layer without pinholes. However, due to the insufficient heat resistance and weather resistance of the adhesive, the characteristics of the fluororesin could not be fully utilized.

In addition, a method has been proposed in which a sheet material made of a polytetrafluoroethylene polymer is composited with a glass fabric using a polytetrafluoroethylene-per70-alkyl vinyl ether copolymer film as an adhesive layer. Depends on the method! 7 The obtained composite sheet material has one surface covered with a pinch-free fluororesin layer, and the fusing material is also a fluororesin, so it is a sheet material with excellent heat resistance and weather resistance. Since the polyethylene fluoride resin has no adhesive properties, it is necessary to use 4
Since it is necessary to bond via the fluorinated ethylene-perfluoroalkyl vinyl ether copolymer film, the operability during bonding is extremely poor.

The purpose of the present invention is to provide a filled fabric that has excellent chemical resistance, heat resistance, weather resistance, and strength without any of the above drawbacks, and can easily join sheet materials together without using an adhesive. It is something to do.

That is, in the fluororesin-filled fabric of the present invention, both sides of the reinforcing fabric are coated with pinhole-free fluororesin to prevent chemical liquids from entering the interior, thereby fully demonstrating the chemical resistance properties of the fluororesin. I can do it. On the other hand, by filling the weaving gaps of the fabric with the fluororesin, the bonding strength between the fluororesin and the fabric is improved by fully bonding the fluororesin layers disposed on both sides of the fabric. In addition, by using fluororesin as a resin that melts at full heat, it is possible to fuse and bond the sheet materials together by simply thermo-compressing the sheet materials together without using an adhesive or a fusion layer. You can improve your sexuality.

Furthermore, since the filled fabric of the present invention is composed only of fabric and fluororesin, it is surprisingly heat resistant.

Excellent weather resistance 1. The fluororesin that can be used in the fluororesin-filled fabric of the present invention must be heat-meltable and heat-sealable. As, tetrafluoroethylene and hexafluoropropylene, perfluoroalkyl vinyl ether, vinylidene fluoride, chlortrifluoroethylene,
A copolymer with one or more types of ethylene, or
Examples include chlortrifluoroethylene polymer and vinylidene fluoride polymer.

In addition, as the reinforcing fabric, it is best to use M eyelids made of glass fiber, carbon fiber, aromatic polyamide fiber, tetrafluoroethylene fiber, or metal fiber as it has excellent strength, weather resistance, and heat resistance. Also, woven fabrics using strong anti-long fibers are suitable. The material and weaving method of the fabric may be selected depending on the purpose of use.

The method for manufacturing the fluororesin-filled fabric of the present invention allows pinhole-free fluororesin layers to be formed on both sides of the reinforcing fabric, and also fills the interwoven spaces of the fabric with the fluororesin. For example, a method in which a woven fabric and a film or sheet of fluorine resin are joined together and pressure is applied while heating the fluororesin to a temperature higher than the melting point of the fluororesin; This can be achieved by a method in which a reinforcing fabric is layered and pressurized at the same time as the reinforcing fabric is extruded.

The present invention will be explained in detail in Examples below.

Example 1 Film of 4-fluoroethylene-6-fluoropropylene copolymer resin (manufactured by Mitsui Fluorochemical Company, Teflon FFIP)
) of glass fabric (thickness 0.2+I
5 to 9 while heating to 350'C.
A Teflon FEP film with a thickness of 25 μm was placed under this, and the film was heated to 300° C., and after being pressed for 2 minutes at a pressure of 5 Kg/1yiN, it was cooled.

The obtained composite sheet material had a thickness of 0.3 am.

This sheet material was cut into 10 cm square pieces and immersed in an ethanol solution at room temperature for 24 hours while sealing the end faces, and the weight increase rate was measured to be 0.2% by weight. On the other hand, when a similar test was conducted on Teflon FEP film (125μ) VC, the weight increase rate was 0.2% by weight.
Met. Further, after applying oil-based ink to the surface of this composite sheet material, it was wiped off and the surface was observed under a microscope, but no cracks or pinholes were observed.

The sheet materials f:N were pressed together, heated to 300° C., and pressed at a pressure of 5 kg/lyl for 2 minutes to thermally fuse them. The fused sheet material was cut into medium length pieces of 10 birds, and a peel test was performed, and the result was 2.5 Kglcrn width. Moreover, the peeling surface occurred between the glass gauze, material, and fluororesin, and the filled fabric of the present invention was able to be firmly bonded without using a fusing agent.

Comparative Example 1 A dispersion liquid of 4-fluorochemically modified tyrene polymer (manufactured by Daikin Industries, Ltd., Polyflon D-1) was applied to a glass fabric (thickness 0
．． 2m5) Apply IC, air dry, and then dry with hot air at 80℃.
Sintering was performed at 400°C for 10 minutes. By repeating this operation five times, a composite sheet material having a thickness of 0.35 tug was obtained.

When this sheet material was immersed in ethyl alcohol solution in the same manner as in Example 1, the weight increase rate was as large as 1.5%. In addition, when the surface was observed using an oil-based ink test, cracks were observed.

Example 2 A film of 4-fluorinated ethylene-perfluoroalkyl vinyl ether copolymer resin (manufactured by Mitsui Fluorochemical Co., Ltd., Teflon PFA) with a thickness of 125 μm was layered on a carbon fiber fabric (thickness: 0.2 m). , while heating to 450°C, pressurize at a pressure of 10 K4/al for 5 minutes, and after cooling,
Furthermore, a Teflon PFA film (thickness 25μ) was placed under this sheet, heated to 350℃, and heated to 5K7/cr&
After applying pressure for 2 minutes, the mixture was cooled.

The obtained composite sheet material had a thickness of 0.35 fins. This filled fabric was examined for the presence of pinholes and cracks in the same manner as in Example 1, but no pinholes or cracks were observed.
It wasn't noticed.

Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] 1) A fluororesin-filled fabric characterized in that both sides of the reinforcing fabric are covered with a pinhole-free fluororesin layer, and the weave gaps in the fabric are also filled with the fluororesin.