JPS5835468B2 - Fluororesin interwoven fabric laminated composite material and its manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention uses fluororesin (hereinafter referred to as PTFE).

) A blended fabric of fibers and other fibers and a blended fabric of thermoplastic polyester fiber and cotton fiber are impregnated with a thermosetting synthetic resin, and the PTFE blended fabric is used as the surface material and the blended fabric is used as the backing material, and the layers are laminated together and heated. , sliding bearings, cams, gears, sliding plates, roller 5 cylinders, seals, etc. that have excellent wear resistance, load resistance, and physical properties without easily peeling due to pressure molding, and have a low coefficient of friction. PTF suitable for use where sliding is required
This invention relates to an E-woven fabric laminated composite material and a manufacturing method thereof.

In general, PTFE bearings have a wide range of uses as so-called oil-less bearings that do not require lubricant.
In particular, it is known that a bearing having a PTFE fiber cloth on the surface of the metal backing has excellent load resistance and a low coefficient of friction.

However, although PTFE fibers are disposed and supported on the surface of another member, that is, a hard backing material such as resin or metal, they have drawbacks such as a weak bond with the backing material, so-called adhesive strength, which may cause peeling.

In view of these, various studies have been conducted in the past, such as impregnating PTFE fibers with a binder, or creating a cross-woven fabric with other fibers that does not impair adhesiveness, and forming an adhesive surface with the other mixed fibers. etc. are taken.

However, even in these methods, P placed on the bearing surface
From the joints and edges of TFE fibers or mixed woven fabrics,
Prevention of peeling of the PTFE fibers and interwoven fabrics remains unsolved.

In addition, for purposes of use, especially for sliding plates used as spacers and liners, during sliding contact, the sliding plate has flexibility that allows it to follow the movement of the material it is sliding against. There is little consideration given to letting people do so.

The present invention solves these problems and provides a flexible laminated composite material.

That is, a resin-treated PTFE interwoven fabric is made of PTFE fibers and other fibers other than the PTFE fibers, and the PTFE fibers occupy 60 to 85φ on the surface, and are impregnated with 25 to 40% by weight of thermosetting synthetic resin. The surface material is made of thermoplastic polyester fiber and cotton fiber, and the blend ratio of the former and the latter is 70:30 to 30 near 0. Resin processing is made by impregnating a thermosetting synthetic resin with 40 to 55 weight φ. A cloth is used as a backing material, and one or more layers of the backing material and the surface material are heated at a temperature of 120 to 200°C and a pressure of 20 to 60 kg.
PTF' characterized by integrally heating and press-forming under conditions of /i time of 0.5 to 2 minutes per wall thickness plate.
The present invention provides an E-woven fabric laminated composite material and a method for manufacturing the same.

In the present invention, the surface layer material is composed of a woven fabric of PTFE fibers and other fibers other than the PTFE fibers, which have high strength and do not impair adhesiveness, such as cotton fibers or glass fibers, and one surface (sliding The fibers are interwoven so that the proportion of PTFE fibers on the moving surface is in the range of 60 to 85.

If the proportion of PTFE fibers on the surface is small, the coefficient of friction will increase, and if the proportion of PTFE fibers is large, the amount of wear will increase, so from the viewpoint of friction and wear, the above range is preferable.

A surface material made of a mixed woven fabric with 60 to 85% PTFE fibers on the surface can also be obtained by changing the thickness of each fiber, but when forming a sliding surface, it is necessary to Since it is desirable that the surface ratio and arrangement distribution of the PTFE fibers and other fibers that appear are uniform, it is preferable to obtain the fibers by a method that changes the interweaving structure, such as satin weave or twill weave.

Further, in the present invention, the backing material is a blended fabric made of thermoplastic polyester fibers and cotton fibers, and the blending ratio is from 70:30 to 30 near-0.

The use of thermoplastic polyester fibers as the backing material is because the polyester fibers themselves are flexible, and because the backing material is impregnated with the thermosetting synthetic resin described below, the polyester fibers are hardly impregnated. Therefore, it exhibits flexibility as a backing material.

In this respect, it is greatly different from conventional backing materials made of cotton cloth, asbestos cloth, glass cloth, paper, nonwoven fabric, etc.

When the proportion of thermoplastic polyester fibers increases, the strength decreases, and when the proportion of cotton fibers increases, the flexibility decreases, causing cracking and peeling.

The synthetic resin that is impregnated into the surface material and backing material mentioned above is
Thermosetting synthetic resins such as phenol resins, epoxy resins, and m-cresol resins are used, but in some cases, modified resins that are blended with these resins with rubber properties such as di-IJ rubber and neoprene rubber are also used. Ru.

In particular, the use of modified resins is useful in imparting greater flexibility to the molded product, improving impact strength, and increasing peel strength between the surface material and the backing material.

The amount of thermosetting synthetic resin impregnated into the surface layer material is preferably 25 to 40% by weight.If the amount exceeds 40% by weight, it will appear on the surface where the PTFE fibers occupy a large proportion and destroy the low friction properties of the PTFE fibers themselves. If the weight is less than 25%, the bonding force with the backing material will be weakened.

In addition, the amount of thermosetting synthetic resin impregnated into the backing material is preferably 40 to 55 weight φ; if the weight exceeds 55 weight, it will warp and the strength will decrease, and if the weight decreases by 40 weight, the bonding force between the backing materials will decrease. It becomes difficult to use as a backing material.

Note that it is preferable to use the same thermosetting synthetic resin to impregnate the surface material and the backing material from the viewpoint of improving the adhesive strength between the surface material and the backing material, but this is not necessarily the case. For example, the surface layer material may be impregnated with the above-mentioned thermosetting synthetic resin, and the backing material may be impregnated with a rubber-modified thermosetting synthetic resin.

The surface material and backing material formed in this way are a single layer of the surface material on a backing material laminated with one or more layers, and the surface with a high proportion of PTFE fibers is the sliding surface. Laminate them at a temperature of 120° to 200°C and a molding pressure of 20 to
A laminated composite material is formed by integral molding at 60 kg/cyj.

Especially when the molding pressure is 20kg/Cr? If it is lower than L, peeling will easily occur, and if it is higher than 60 kg/cIIL, the PTFE fibers of the surface layer material will be damaged, so care must be taken.

In addition, especially when manufacturing a plate-shaped laminated composite material, the molding time is determined depending on the thickness of the composite material, and is generally determined by the thickness of the composite material.
A suitable time is 0.5 to 2 minutes.

Next, examples of the laminated composite material of the present invention will be described.

The embodiment described below is a plate-shaped laminated composite material shown in FIG. 1, in which reference numeral 1 is a surface layer material and 2 is a backing material.

Example PTFE fiber (400 denier, number of threads: 80/inch) and glass fiber (101 denier, number of threads: 65)
The first step is to manufacture the surface layer material 1 of a resin-treated PTFE mixed woven fabric by impregnating 30% by weight (as solid content) of phenolic resin (concentration 55φ varnish) into a mixed woven fabric made of twill weave (1/inch) and drying it. A blended fabric consisting of thermoplastic polyester fibers (65φ) and cotton fibers (35%) was impregnated with 45% by weight (solid content) of phenolic resin (varnish with a concentration of 55%) and dried.

The second step of manufacturing the backing material 2 of the resin-treated cloth; and 1. The surface layer material 1 and the backing material 2 obtained in the first and second steps are laminated to obtain the desired dimensions (wall thickness of 6 mm), and the
A plate-shaped laminated composite material was obtained in the third step of compression molding by placing it in a mold heated to .degree. C. and heating and pressing for 6 minutes at a pressure of 50 kg/d.

Here, the method of laminating the surface material 1 and the backing material 2 is to laminate one layer or two or more layers of the backing material 2, and then apply a single layer of the surface material 1.
In addition, the surface of the PTFE fiber that occupies a high proportion of the surface is arranged as a sliding surface.

The laminated composite material thus produced has excellent flexibility and has a smooth surface, so it can be used as a molded product without machining.

Figures 3 and 4 show the plate-shaped laminated composite material obtained in this example (marked with ○ in the figure), the single PTFE product (marked △ in the figure), and the filled and carved PTFE composite material (marked with ○ in the figure). Figure 3 shows the comparative test results for bearing performance, with the vertical axis showing the friction coefficient and the horizontal axis the cumulative load. Figure 4 shows the comparative test results for durability, and the vertical axis shows wear. The horizontal axis indicates the test time.

The test was conducted as a thrust test, and the conditions were as follows.

From the above comparative tests, it was found that PTFE alone and filled and engraved PT
It is obvious that the PTFE interwoven fabric laminated composite material of the present invention has superior load resistance and abrasion resistance, as well as a low coefficient of friction, as compared to FE composite materials, and also shows no cracking or peeling. Ta.

Note that the arrows in the figure indicate points where the friction coefficient increased and abnormal wear occurred.

In addition, in this example, a method for producing a plate-shaped laminated composite material by compression molding was described, but the cylindrical laminated composite material shown in FIG. 2 (numerals in FIG. 2 are the same as in FIG. 1)
To manufacture , normally three heating rollers and one pressure roller are arranged so that each is located at the apex of a triangle, a core mold is placed in the middle, and a resin-treated cloth is wrapped around this. This is carried out by the Rold molding method, in which a core mold is driven and rotated in a fixed direction, and a laminated tube is obtained while being pressurized and heated by the three rollers mentioned above.

That is, the surface material 1 is wound around a core mold that has been preheated to 120 to 200°C, and the backing material 2 is wrapped around the core at a temperature of 120 to 200°C.
Via a heated roller heated to 00°C, and from 20 to
A cylindrical laminated composite material is manufactured by winding it with a pressure roller at a pressure of 60 kg/i.

The present invention consists of PTFE fibers and other fibers other than the PTFE fibers, and the PTFE fibers occupy 60 to 85 mm on the surface, and the surface layer is made by impregnating the PTFE cloth with a thermosetting synthetic resin. The lining is made of a blended fabric of thermoplastic polyester fiber and cotton fiber, with a blend ratio of thermoplastic polyester fiber and cotton fiber in the range of 70:30 to 30:0, impregnated with thermosetting synthetic resin. By laminating the materials and integrally heating and press-molding them, a PTFE interwoven fabric laminated composite material that is flexible, does not peel or crack, and exhibits good performance can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views showing the laminated composite material of the present invention, and Figures 3 and 4 are bearing performance comparison tests of the laminated composite material of the present invention, PTFE alone, and filled PTFE composite material. FIG. 1...Surface material, 2...Backing material.

Claims (1)

[Scope of Claims] 1. Consisting of fluororesin fibers and cotton fibers or glass fibers other than the fluororesin fibers, which have high strength and do not impair adhesive properties, and the fluororesin fibers have a diameter of 60 to 85 mm on one surface.
25 to 40% by weight of thermosetting synthetic resin in the mixed woven fabric
The surface layer is impregnated resin-treated fluororesin mixed woven fabric, and is made of thermoplastic polyester fiber and cotton fiber, with the blend ratio of the former and the latter being 70:30 to 30:70, and thermosetting synthetic resin is added to the blended fabric. The backing material is a resin-treated blended fabric impregnated with 40 to 55% by weight of
A laminated composite material of fluororesin mixed and woven fabrics, which is made by laminating and integrally adhering the surface occupying 85 mm as a sliding surface. 2 Heat-curing is applied to a mixed woven fabric consisting of fluororesin fibers and cotton fibers or glass fibers other than the fluororesin fibers, which have high strength and do not impair adhesion, and where the fluororesin fibers occupy 60 to 85 fibers on one surface. The first step is to produce a surface layer material made of a resin-treated fluororesin mixed woven fabric impregnated with 25 to 40% by weight of a synthetic resin, and a thermoplastic polyester fiber and a cotton fiber, with a blending ratio of the former and the latter of 70: 3
0 to 30 near 0 blended fabric with thermosetting synthetic resin 4
A second step of manufacturing a backing material made of a resin-treated blended cloth impregnated with 0 to 55% by weight, and a sliding surface of the backing material made of one or more layers of fluororesin fibers of 60 to 85φ. Laminated as a temperature 120-200℃, pressure 20℃
A method for manufacturing a fluororesin mixed woven fabric laminated composite material comprising a third step of integrally depositing the material at ~60 kg/ffl.