JPS62106135A - Non-asbestos clutch facing - Google Patents

Abstract

PURPOSE:To prevent a decrease in coefficient of friction at high temperatures, by using an alkali resistant glass fiber as a base material, and hindering the glass fiber from being molten at high temperatures of about 400 deg.C. CONSTITUTION:A clutch facing is formed of an alkali resistant glass fiber as a base material. In the event that a temporary high load is applied to the clutch facing to result in high temperatures not less than 400 deg.C, the glass fiber is not hindered from being molten. Accordingly, it is possible to improve a heat resistant, mechanical strength and wear resistance and additionally reduce a coefficient of thermal expansion.

Description

[Detailed Description of the Invention] The present invention relates to a non-asbestos clutch facing, and more specifically, it has excellent heat resistance without decreasing the friction coefficient even when used under high temperature conditions. Regarding non-asbestos tardage facing.

Technical Background of the Invention and its Problems Conventionally, clutch facings have been produced using yarn-like, roving-like, tape-like, cross-like, or flat ring-like base fibers made of asbestos, glass fiber, aromatic polyamide fiber, carbon fiber, etc. After adhering a thermosetting resin such as a phenolic resin, a filler such as a rubber compound, a vulcanizing agent, a vulcanization accelerator, a friction improver, etc. is dissolved or dispersed in a solvent, or each of the above is applied. The binding composition obtained by mixing and dispersing the components in a mixing bowl is applied to a rough surface, and then this base fiber is preformed into a spiral shape or a laminate shape, and then molded into a mold or the like. It was manufactured by heating and pressurizing it to harden it.

By the way, the tardge facing, which is made of asbestos,
It has the advantage of being inexpensive and having excellent wear resistance. However, in recent years, the problem of depletion of asbestos resources and resulting difficulty in obtaining asbestos has arisen, as well as the negative effects of asbestos on the human body have been pointed out, and the use of asbestos has begun to be re-examined.

For this reason, clutch facings have been manufactured using Karas IJil, aromatic polyamide fibers, etc. as base fibers instead of asbestos, but these clutch facings have an IA strength of 1♀ corrosion resistance. However, it was not always satisfactory in terms of heat resistance. I wanted it to be made of glass fiber and aromatic polyamide! For clutch facings that use Ii cord or the like as a base fiber, it is necessary to avoid high temperatures during use as much as possible.

Recently, as automobiles have increased in output and clutch facings have become smaller and lighter, a high load is placed on the clutch facings, which may temporarily reach a high temperature exceeding 400'C. However, clutch facings based on aromatic polyamide fibers cannot withstand high temperatures due to their inferior heat resistance, and clutch facings based on ordinary glass fibers cannot withstand high temperatures. There was a serious problem in that the glass fibers melted and the coefficient of friction suddenly decreased.

In order to solve these problems, the inventor of the present invention conducted extensive research and found that as a base material for non-asbestos clutch facings,
The above problems can be solved at once by using glass fibers of 1;;' which melt when heated to a temperature of 300-400'C This discovery led to the completion of the present invention.

Purpose of the Invention The present invention is intended to solve the above-mentioned problems, and it is necessary to solve the problem that glass fibers melt when the temperature reaches a high temperature of about 400'C, causing a sudden drop in the coefficient of friction. Without,
The object of the present invention is to provide a method for producing a non-asbestos clutch facing having glass fiber as a base material and having excellent mechanical strength d3 and friction resistance.

Summary of the Invention The clutch facing according to the present invention is characterized in that the clutch facing 114 is made of alkali-resistant glass fiber.

In the present invention, the clutch facing is made of alkali-resistant glass fiber as a base material, so even if the temperature exceeds 400°C temporarily when the clutch facing is used)
The lath fiber has excellent heat resistance without melting V, and also has excellent mechanical strength. Therefore, the friction coefficient of the resulting clutch facing does not decrease.

Detailed description of the invention The present invention will be explained in more detail below.

In the clutch facing according to the present invention, i4 alkali glass fiber is used as the clutch facing B44.

Such alkali-resistant glass fibers are usually 0)
jj =/':), in addition to the components, TiO2, ZrO2
, Fe2O3, V2O5, NtO, cr 2 o 3
, Pt, AU, etc.

The basic glass system that forms the basis of this glass fiber is L
i20 S i 02 , Na2Ofvlgo-3
i02, silicate glasses such as Na20-BaO-3i02, Li20-Aβ203S! 02,N
B20-A, Q 203-3 i○z, 2 to L'20-
203 S i 02 at 0-△, lVtgo-Al
I303 SiO2, CaOAlI303 510
2, BaOA, Q203S! 02, Pb
.

A,ll 203 S! Aluminosilicate glass such as 02, phoinolate glass such as PbO-7nO-8203, Aβ203 B203 5102, Zn
Bowkur i'M salt glass such as O-B2O3-8102, Mg0-p205-s:o2KJ2a glass, etc. may be used.

More specifically, the glass fiber according to the present invention is S i
02-Z r02-Na20- to 20-CaO-12
03 series, S i02 zro2 Na20 to 20
B aOB203 A, ll 203 series, S i 0
2 Zr 02 Na2OL +20- to 2O-B
Preferably, it is formed from a glass-based material such as aO-8203-12o3-based material.

If a clutch facing is formed using such alkali-resistant glass fiber as a base material, a temporary high load will be added to the clutch facing, resulting in -400' in terms of IL'J.
Even if it becomes C or more, the glass fiber will not melt in FF. Therefore, the clutch facing obtained by using this II alkali glass fiber as a base jA woven fiber has excellent heat resistance and It has poor mechanical strength and wear resistance,
Moreover, the coefficient of thermal expansion is small.

One of the reasons why such alkali-resistant glass fiber has excellent heat resistance is thought to be that it contains ZrO2 as a glass component, but another reason is that this alkali-resistant glass fiber has excellent heat resistance. When heated above 400° C., crystallization occurs on a part of the surface, and it is presumed that this crystallization improves the heat resistance of the glass fiber. This is because once glass fibers are crystallized, their softening temperature increases compared to the original glass fibers, and they no longer soften when heated to about 400°C.

For the clutch facing according to the present invention, conventionally known components and manufacturing methods can be applied to the other components and manufacturing methods, except for using alkali-resistant glass fibers as the base fibers.

Other components and manufacturing methods used in manufacturing the clutch facing according to the present invention will be briefly described below.

The thermosetting resin (1) that is attached to the above J: 4j alkali crow fibers is specifically a phenol resin, a urea resin, a melamine resin, an epoxy resin, etc. Among them, phenol resin is preferred;
Phenolic resins include novolac type, resol type,
Alternatively, modified phenolic resins such as cresol-modified, melamine-modified, rubber-modified and oak-modified resins are used.

Next, a binder composition is applied to the glass fiber base material on which the thermosetting resin has been deposited. It is composed of a filler such as a detection enhancer.

The above rubber materials include butadiene rubber (t3R), styrene-butadiene rubber (SBR), isoprene rubber (
IR), ethylene-propylene rubber (EPM), butyl rubber (IIR), acrylonitrile-butadiene rubber (
NBR>, acrylic rubber (ACM), tarethane rubber (U), silicone rubber (S i ), fluororubber (FPM), polysulfide rubber (T), polyether rubber (
Synthetic rubbers such as FOR) as well as natural rubbers can be used, with styrene-butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR) being particularly preferred.

As the vulcanizing agent, sulfur, zinc oxide, magnesium oxide, organic peroxide, organic sulfur-containing compound, modified phenol resin, etc. are used. In addition, examples of vulcanization accelerators include thiazole accelerators, sulfenamide accelerators, dithiocarbame-1 accelerators, aldehyde amine accelerators, guanidine accelerators, thiourea accelerators, and xanthi-1 accelerators. agent, aldehyde ammonia type accelerator, thiraum type accelerator, etc. are used.

As fillers such as friction improvers, clay, tartar, barium sulfate, cashewges 1, graphai], calcium carbonate, etc. are used.

After attaching the thermosetting resin and filler as described above to the base fiber, or attaching the thermosetting resin, rubber material, vulcanizing agent, 1-1 sulfur accelerator, and filler, the base material If the fibers are preformed into a spiral or laminate shape and then the obtained preform is heated and compressed, a clutch facing of 1 q can be obtained.

When integrating this preform, the preform is placed in a mold, and preferably 100 to 2001<gf/C112
If it is heated and compressed under the pressure of 150 to 200'C and integrated, it is possible.

Effects of the Invention Since the non-asbestos clutch facing according to the present invention is formed using alkali-resistant glass fiber as a base material, use of clutch facing 11.1-II;'J
Even at a temperature of 400'C, glass fiber does not melt and has excellent heat resistance J3 and mechanical strength. Therefore, the obtained clutch facing does not have a significant decrease in the coefficient of II at high temperatures, has excellent internal strength c15 and wear resistance, and has a small coefficient of thermal expansion. However, the present invention is not limited to these examples.

Example 1 A lath fiber assembly (obtained from alkali-resistant glass having the following composition) was used.

Glass fiber SiO... 62.5 wt% A, [l 2
o3 ・・・・・・ 0.4 Weight% Na2
O... 14.4 20% by weight
0.5 City■%ZrO・・・・・・ 16.7
Weight% TiO2... 0.05@Amount%C
aO5.3% by weight Fe2 o3++++ o, 06Iffi% NB per 100 parts by weight of phenolic resin in this base fiber
A thermosetting resin composition containing 20 parts by weight of R rubber latex was applied so that the base fiber to thermosetting resin composition ratio was 70:30.

Next, a binding composition having the following composition was applied to the base fiber that had been treated as described above so that the weight ratio of base fiber to binder composition was 70:3.
It was made to adhere so that the ratio was 0.

Binder composition Nll or 52 wt ω% Sulfur 8,000% Filler /IO wt% The base fiber treated as above is preformed into a spiral shape, and the 1q preformed body is molded into a mold. Pressure 160k at
f(]/cm" at a temperature of 170'CT--heating and compression was performed to obtain a clutch facing.

When the resulting clutch facing was used under high load and its surface was heated to about 400° C., no evidence of melting was observed when the surface was observed under a microscope.

Comparative Example A clutch facing was manufactured in the same manner as in Example 1, except that ordinary E glass, which is not alkali-resistant glass, was used in d3 of Example 1.

After the obtained clutch facing was used under high load conditions and its surface was heated to approximately 400°C, the surface was observed under a microscope and evidence of melting was observed.

Claims (2)

[Claims] (1) A non-asbestos clutch facing characterized by using alkali-resistant glass fiber as the clutch facing base fiber. (2) The alkali-resistant glass fiber is SiO_2-ZrO_
The clutch facing according to claim 1, characterized in that it is formed from alkali-resistant glass of 2-Na_2O-K_2O-CaO-Al_2O_3 series.