Low-temperature resistant fluororubber for oil seal

Abstract

The invention belongs to the technical field of rubber, and particularly relates to low-temperature resistant fluororubber for an oil seal. The low-temperature resistant fluororubber comprises the following components in parts by weight: 0-100 parts of fluororubber VPL85540, 0-100 parts of fluororubber LTFE6400, 0.5-1.5 parts of HT290, 10-40 parts of 10WC10222, 0-40 parts of N990, 0-10 parts of N774, 3-4 parts of TAIC-70 and 1.2-2 parts of 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane-45. The fluororubber provided by the invention has excellent low-temperature resistance while guaranteeing resistance to high temperature and oil; the low-temperature retraction temperature TR10 can reach minus 40 DEG C; by adopting the rubber provided by the invention to manufacture an oil seal of a damper, the oil seal can be used for a long time at (-40)-(+200) DEG C.

Description

technical field [0001] The invention relates to a fluororubber used for a shock absorber oil seal, in particular to a fluororubber used for a low temperature resistant oil seal, belonging to the technical field of rubber. Background technique [0002] In the shock absorber reciprocating oil seal industry, the main rubber material currently used is NBR. NBR can meet different service temperature ranges according to the different ACN content. For example, NBR with low ACN content can meet the use in the range of -40 ~ +100 ℃. NBR with medium and high ACN content can be used in the range of -25~+120℃. However, with the rapid development of the automobile industry towards high speed, comfort and wider regionalization, higher requirements are put forward for shock absorbers. Nowadays, many shock absorbers require oil seals to be used at higher temperatures for a long time, such as 160°C and above 160°C, and it is also necessary to ensure that the shock absorber does not leak oil...

AI Technical Summary

Problems solved by technology

However, ordinary fluororubber has poor low temperature resistance. The low temperature retraction temperature TR10 of type 26 fluororubber is generally -17°C, and the low temperature retraction temperature TR10 of type 246 fluororubber is generally -14°C. Obviously, traditional fluororubber has poor low temperature resistance. When the temperature is below -20°C, the fluororubber completely loses its elasticity and loses its sealing performance

Therefore, the oil seal made of ordinary fluorine rubber cannot meet the requirement of no oil leakage when the shock absorber starts at a low temperature of -40°C.

Images