Formula for negative pressure bellows

Abstract

The invention relates to a formula for a negative pressure bellows, comprising the following ingredients by weight percentage: 30-50wt percent of butyronitrile rubber, 5-20wt percent of polyvinyl chloride, 4-8wt percent of dioctyl-phthalate (DOP), 10-16wt percent of fast extruding furnace black (FEF), 5-15wt percent of figuline, 1-2wt percent of anti-aging agent A, 1.5-2.5wt percent of zinc oxide, 0.5-1.5wt percent of stearic acid, 0.5-1.5wt percent of paraffin, 0.2-0.4wt percent of tetramethylthiuram disulfide, 0.5-1.5wt percent of brimstone, 0.2-0.6wt percent of mercaptobenzothiazole, and 1-5wt percent of aramid short fiber; after study and experiment, semi-reinforcing strong carbon black is removed in the new formula, one weighting program can be reduced and the cost is reduced; the argilla, paraffin and TMTD in the new formula can lead the aramid short fiber to be uniformly dispersed in the rubber, and the elasticity and flowability of the rubber can be increased.

Description

Background technique [0001] The material for making negative pressure bellows is generally selected from the combination of nitrile rubber and chlorinated polyethylene (NBR+PVC). With the development of the automobile industry, the negative pressure of the rubber hose used in the negative pressure working environment of the automobile is increasing. A spring is added inside the rubber tube to support the tube body so that it will not be sucked when it receives negative pressure. The use of bellows with added ribs makes the mold complex and difficult to demould during vulcanization; the use of bellows with added springs not only adds a process, but also greatly increases the cost. In order to meet higher negative pressure requirements, there must be a new type of negative pressure bellows, so it is imperative to develop a new formula. Contents of the invention [0002] The purpose of the present invention is mainly to improve the negative pressure resistance of the existing...

AI Technical Summary

Problems solved by technology

[0002] The purpose of the present invention is mainly to improve the negative pressure resistance of the existing bellows, and to solve the problems of the existing bellows, such as increased cost and low output rate, due to the increase in negative pressure requirements.