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Gasket material

A padding and filling material technology, which is applied in the field of padding materials, can solve the problems of high cost of aramid fiber and reduce the mixing amount of aramid fiber, so as to avoid the high cost of raw materials, increase the tensile strength, and improve the sealing performance Effect

Active Publication Date: 2011-04-27
NIPPON LEAKLESS IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of aramid fiber is high, so in order to reduce the cost, it is necessary to reduce the mixing amount of aramid fiber

Method used

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Examples

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Embodiment

[0038] According to Comparative Examples 1-8 shown in Table 1 and Examples 1-12 of the present invention, the mixing ratios of aramid fibers, acicular dolomite, silica, rubber, and inorganic fillers were changed to prepare bonding pads respectively. The performance of the sheet is confirmed by tensile strength test, bolt load drop rate test, and ultimate sealing pressure test.

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Abstract

Disclosed is a low-cost gasket material which has improved strength, while maintaining high flexibility. The gasket material is composed of a joint sheet (1) formed by pressure-laminating a raw material, which is obtained by mixing a rubber, a reinforcing fiber and a filler, with calender rolls and vulcanizing the resulting product. The basic composition of the raw material is composed of 16-28 wt% of NBR serving as the rubber, 4-8 wt% of an aramid fiber serving as the reinforcing fiber, 10-20 wt% of a needle-like dolomite serving as the reinforcing fiber, 8-20 wt% of silica particles servingas the filler, and the balance of an inorganic filler serving as the filler.

Description

technical field [0001] The present invention relates to materials used for gaskets of engines and transmissions mounted on vehicles, etc., and particularly relates to joint pads formed by pressing, laminating and vulcanizing raw materials kneaded with rubber, reinforcing fibers, and fillers with calender rolls The sheets constitute the dunnage material. Background technique [0002] Since the engine is repeatedly turned on and off, a large temperature change occurs in a gasket insertion portion between a transmission case combined with the engine and a transmission cover fixed to the case by bolts. Therefore, in the case where a gasket is used for the gasket insertion portion, repeated temperature changes cause repeated relative displacement (fretting wear) of the joint surfaces between the housing and the transmission cover and the gasket. In addition, the rigidity of the structural body decreases due to weight reduction, which may cause fretting wear due to external force...

Claims

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Application Information

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IPC IPC(8): F16J15/10C08K3/00C08K7/08C08K7/18C08L9/02C09K3/10
CPCC09K2200/0243C08L9/02C09K2200/0695C09K2200/0247C09K2200/0612C09K3/10
Inventor 藤原健秋吉浩二浜田义明永井康晃望月信介
Owner NIPPON LEAKLESS IND CO LTD
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