Heat-resistant and oil-resistant butadiene-acrylonitrile rubber material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of rubber seal and discloses a heat-resistant and oil-resistant butadiene-acrylonitrile rubber material as well as a preparation method and application thereof. The butadiene-acrylonitrile rubber material comprises the following components in parts by mass: 100 parts of butadiene-acrylonitrile rubber,3-5 parts of zinc oxide, 3-5 parts of light magnesium oxide, 0.3-0.6 part of stearic acid, 35-50 parts of carbon black, 2-3 parts of a reactive antioxidant, 2-3 parts of 2-mercapto benzimidazole zinc salt, 1.5-2.3 parts of peroxide, 0.8-3 parts of N,N'-m-phenylene dimaleimide and 0.1-0.2 part of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxygen radical. After the rubber material is subjected to hot-air ageing at 120 DEG C for 70 hours, the permanent compression deformation rate (a type B sample) is not more than 18% and the break elongation rate and the retention rate are more than 90%. The rubber material is especially suitable for manufacturing oil-resistant static seal parts capable of being used at 100-120 DEG C for a long term, and can endow seal products with excellent durability.

Description

technical field [0001] The invention belongs to the technical field of rubber sealing, and in particular relates to a nitrile butadiene rubber compound used for heat resistance and oil resistance at 100-120 DEG C and its preparation method and application. Background technique [0002] Products with different uses have different service life evaluation standards and methods. For rubber O-rings and elastomers, the two most critical technical indicators related to life are compression set and elongation retention after aging. Generally, 100℃ or 120℃×70h (or 168h) accelerated aging test is used in the laboratory to characterize. According to the time-temperature equivalent equation (WLF), the change of short-term aging performance at high temperature can be converted into the long-term change at low temperature. For an O-ring of a certain specification, if the compression set of product A at 100°C×70h is 20%, and the compression set of product B at 120°C×70h is 20%, then in a...

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Problems solved by technology

[0003] In April 2006, an article titled comparative study of reactive anti-aging agent MC and anti-aging agent 4020 was published in Special Rubber Products Vol. performance, but this article uses NBR with a medium ACN content, and the anti-aging agent does not use other heat-resistant anti-aging agents. The heat resistance of the material is limited to 100°C, and the data at higher temperatures (120°C) is not given, and the full text is not given. Compression set performance, can not meet the needs of the product of the present invention

The publication number is CN103483642A "the patent of nitrile rubber / EPDM heat-resistant aging material and its preparation method, and the patent of publication number CN103524806A is a high-strength heat-resistant aging modified nitrile rubber cable material. EPDM with a grade of 150°C improves the heat resistance of NBR, but the volume expansion of EPDM and oil will seriously damage the oil resistance

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