Butadiene-acrylonitrile rubber with low hardness and high acrylonitrile content and preparation method thereof

Abstract

The invention relates to the technical field of rubber manufacturing, and discloses butadiene-acrylonitrile rubber with low hardness and high acrylonitrile content. The butadiene-acrylonitrile rubber is prepared from 40-45 parts of butadiene-acrylonitrile rubber, 2-3 parts of zinc oxide, 1-2 parts of an anti-aging agent, 5-10 parts of carbon black, 20-25 parts of inorganic filler, 10-15 parts of a softening agent, 2-5 parts of liquid butadiene-acrylonitrile rubber, 0.2-0.5 part of sulfur and 1-2 parts of an accelerant. The invention also discloses a preparation method which comprises the following steps: S1, plastifying: plastifying the nitrile rubber for 80-100 seconds, and recording a current value as A1; S2, mixing: firstly adding an anti-aging agent and zinc oxide, conducting mixing for 80-100 seconds, then adding carbon black, an inorganic filler and 20 parts of a softening agent, controlling the current to be greater than A1, after 18-25 seconds, adding liquid nitrile rubber and 40 parts of a softening agent, after the current reaches A1/2, adding the rest of the softening agent, after the mixing temperature reaches 85-100 DEG C, discharging rubber into an open mill, and conducting off-batching through the open mill; and S3, conducting vulcanizing. The viscosity of the rubber material can be increased, and the problem of air clogging is solved.

Description

technical field [0001] The invention relates to the technical field of rubber manufacturing, in particular to a nitrile rubber with low hardness and high acrylonitrile content and a preparation method thereof. Background technique [0002] At present, in the rubber industry, softeners are usually added to reduce the hardness of rubber, and low-hardness rubber needs to add a large amount of softeners. Usually, the nitrile rubber with high acrylonitrile content is acrylonitrile and butadiene copolymer, and the acrylonitrile content is greater than 40%. For nitrile rubber with high acrylonitrile content, its polarity is relatively high, and its compatibility with conventional softeners is relatively poor, which will cause a series of problems: [0003] 1) It is not easy to mix in during mixing, and the mixing time is prolonged; [0004] 2) Poor appearance such as flow marks and pockets caused by injection; [0005] 3) The softener is sprayed out during storage or use of vulca...

AI Technical Summary

Problems solved by technology

[0003] 1) It is not easy to mix in during mixing, and the mixing time is prolonged;

[0004] 2) Poor appearance such as flow marks and pockets caused by injection;

[0005] 3) The storage of vulcanized products or the spraying of softeners during use will cause the hardness to increase

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