JPH0578648A - Method for producing frictional material - Google Patents

Abstract

PURPOSE:To produce a frictional material of thin film having <=1mm thickness. CONSTITUTION:Woven fabric of inorganic fibers and/or organic fibers is impregnated with a filler and a resin by a wet method, dried and cured under heating. Since the woven fabric is used as a substrate, strength is increased. The filler is uniformly and firmly dispersed and held on the woven fabric. Molding is facilitated and a material is properly selected so that a frictional material having a prescribed thickness and a desired performance can be readily and efficiently produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a friction material, and particularly in the fields of home appliances, machines, automobiles, etc.
The present invention relates to a method for manufacturing a friction material that is effectively used as a control material for rotating or sliding motion.

[0002]

2. Description of the Related Art A friction material of this type has hitherto been mainly composed of asbestos as a main reinforcing fiber material, and a mixture prepared by adding various inorganic fillers and organic fillers to this, and using a thermosetting resin such as phenol resin. Manufactured by pressure molding and solidification.

Among the materials used for manufacturing such conventional friction materials, the inorganic filler is barium sulfate,
Calcium carbonate, carbon, diatomaceous earth, alumina, silica, various metal powders, metal fibers and the like are used, and as organic filler, cashew dust, rubber particles and the like are used. Further, as the fiber material, in addition to asbestos, there are carbon fiber, glass fiber, rock wool, glass wool, ceramics wool, aramid fiber, and various whiskers, and friction materials are manufactured by mixing these in appropriate amounts. There is.

[0004]

As described above, the conventional friction material must have a thickness of 1 mm or more in order to mold and produce a mixture of dozens of materials.
It was difficult to manufacture. Incidentally, the thickness of the conventional friction material provided conventionally is 3 to 10 mm.

On the other hand, a friction material having a small thickness, for example, a thickness of 1
Since the friction material having a thickness of up to 3 mm is made by a papermaking method, it has been difficult to obtain high friction performance because of its different composition.

The present invention is a method for producing a high-strength friction material having excellent friction performance by solving the above-mentioned conventional problems, and a friction material having a small thickness can be easily produced. An object is to provide a method for manufacturing a material.

[0007]

The method for producing a friction material of the present invention is characterized in that a woven fabric of inorganic fibers and / or organic fibers is impregnated with a filler and a resin, dried, and then cured. To do.

The present invention will be described in detail below. In the method of the present invention, first, a woven fabric is manufactured using inorganic fibers and / or organic fibers. The fibers used here may be the same as conventional ones. As the inorganic fibers, glass, carbon or ceramics fibers or the like may be used, and as the organic fibers, aramid fibers or the like may be used.

The weave and thickness of the woven fabric produced from these fibers are not particularly limited, but the weave does not impair the strength of the obtained friction material and the impregnation ratio of the filler or resin. In order to sufficiently secure the above, it is preferable that the diameter of the weave (mesh) is about 0.2 to 2.0 mm. The thickness is appropriately determined depending on the thickness of the desired friction material and the required strength, but is generally about 0.2 to 1.0 mm. The thickness of this woven fabric can be appropriately adjusted depending on the fiber diameter of the fibers used.

Next, the weave (mesh) of the resulting woven fabric is impregnated with a mixture of various fillers and a resin, for example, a thermosetting resin such as a phenol resin, by wet impregnation. It is supported in a uniformly dispersed state. Here, the fillers are the same as conventional ones, for example, barium sulfate, calcium carbonate, carbon, mica, diatomaceous earth, alumina, silica, various metal powders, inorganic fillers such as metal fibers, or cashew dust, Organic fillers such as rubber particles can be used.

The impregnation ratio of the fillers and the resin into the woven fabric is not particularly limited and is appropriately determined depending on the required friction performance, strength, moldability, thickness of the friction material and the like.
Usually, 10 g of fillers is added to 100 g of woven cloth.
It is preferable to impregnate 70 g and about 10 to 60 g of resin.

After the woven cloth is impregnated with the fillers and the resin, the woven cloth is dried at about 80 to 120 ° C., heated to the curing conditions of the resin used, and if necessary, pressure-molded to cure. For example, when a phenol resin is used as the thermosetting resin, the heating and solidifying conditions are a temperature of 250 to 350 ° C. and a pressure of 100 to 500 kg / cm ² .

This makes it possible to easily manufacture a desired friction material having various shapes such as a sheet shape.

[0014]

In the present invention, since a woven fabric of inorganic fibers and / or organic fibers is used as a base material, it is possible to obtain a friction material which is resistant to tensile stress in the longitudinal and transverse directions.

However, since such a woven fabric is impregnated with various fillers, the filler can be uniformly and firmly dispersed and supported on the fibers. Therefore, a friction material having a large friction coefficient and excellent homogeneity of friction performance can be obtained. Moreover, since the woven cloth carrying the fillers is formed into the texture, the moldability is good, and the woven cloth can be easily formed into a sheet shape or the like.

In particular, in the present invention, the type of fibers used, the size and thickness of the texture of the woven cloth, the type of fillers,
The compounding amount and the like can be variously changed, and a friction material having a desired thickness, friction performance and strength can be easily manufactured.

The method of manufacturing the friction material of the present invention has a thickness of 1 mm.
Hereinafter, for example, it is effective for manufacturing a thin sheet friction material having a thickness of 0.4 to 0.6 mm, but needless to say, it is also applicable to manufacturing a friction material having a thickness exceeding 1 mm.

[0018]

EXAMPLES The present invention will be described in more detail with reference to the following examples.

Example Using a glass fiber (glass roving), a woven fabric having a weave (mesh) of 0.5 mm was produced.
A mixture of the amount of the filler shown in Table 1 and 30 g of a phenol resin was impregnated by a wet method. Then this one
After being dried at 20 ° C., the sheet-shaped friction material was manufactured by press molding at a temperature and pressure shown in Table 1 by a hot press and curing. The thickness and friction coefficient of the obtained sheet-like friction material were measured, and the results are shown in Table 1.

For comparison, the thickness of the conventional method is 0.4 mm.
Table 1 (No. 5) also shows the friction coefficient of the friction material.

From Table 1, according to the method of the present invention, 0.4
It is clear that even a thin friction material having a thickness of up to 0.6 mm can be manufactured as a friction material having excellent friction performance.

[0022]

[Table 1]

[0023]

As described above in detail, according to the method for manufacturing a friction material of the present invention, the friction material is a thin friction material having a thickness of 1 mm or less, and the strength and friction performance are significantly improved as compared with the conventional products. The friction material can be manufactured easily and efficiently.

Since the thin friction material produced by the present invention has a small thickness, it can be easily and firmly adhered to the friction substrate, and due to its excellent friction performance and high strength, it has a significantly good friction characteristic for a long period of time. Exert.

Claims (1)

[Claims] 1. A woven fabric of inorganic fibers and / or organic fibers,
A method for producing a friction material, which comprises impregnating a filler and a resin, drying, and then curing.