Low-pressure variation ethylene acrylate rubber material resistant to ultra-low temperature and high-temperature oil, and preparation method thereof

Abstract

The invention discloses a low-pressure variation ethylene acrylate rubber material resistant to ultra-low temperature and high-temperature oil, and a preparation method thereof, and belongs to the technical field of rubber sealing pieces. The ethylene acrylate rubber material comprises 100 parts of ethylene acrylate rubber Vamac GLS, 1.5 to 2.5 parts of 4,4'-bis(phenyl isopropyl) diphenylamine, 0.3 to 0.7 part of a processing aid 18D, 0.5 to 1.5 parts of stearic acid, 0.5 to 1.5 parts of a processing aid VAM, 85 to 115 parts of carbon black ST1120, 5 to 20 parts of a softening plasticizer EK-70, 0.8 to 1.6 parts of a cross-linking aid HMDC-1 and 2 to 2.4 parts of vulcanizing agent 1,8-diazabicyclo[5.4.0]undec-7-ene. The preparation method of the ethylene acrylate rubber material comprises the steps of mixing of a master batch, post vulcanization of the master batch and vulcanization. The prepared ethylene acrylate rubber material can meet requirements of VW TL52329 technical indexes, and has the characteristics of ultra-low temperature resistance, high-temperature oil resistance, low pressure variation and low cost.

Description

technical field [0001] The invention relates to the technical field of rubber seals, more specifically, to a low-pressure variable ethylene acrylate rubber material resistant to ultra-low temperature and high temperature oil and a preparation method thereof. The rubber material of the invention not only meets the VW TL52329 standard, but also has It has the characteristics of ultra-low temperature resistance, high temperature oil resistance, low pressure change, and low cost. Background technique [0002] With the rapid development of the automobile industry and the harsh requirements of the use environment, the requirements for rubber seals are getting higher and higher, especially the low temperature resistance. Rubber seals with poor low temperature resistance tend to cause oil leakage from automobile engines due to losing their sealing ability in low temperature environments. In order to avoid engine oil leakage caused by the failure of rubber seals, automobile OEMs oft...

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Problems solved by technology

[0003] Existing ethylene acrylate rubber seals are prone to failure during high and low temperature cycle tests. It is necessary to develop an ultra-low temperature resistant ethylene acrylate rubber material that can meet both the technical indicators of VW TL52329 and the above high and low temperature cycle tests.

However, although ethylene acrylate rubber has good oil resistance, high temperature resistance, and low temperature resistance, it still has a high degree of development to meet the technical indicators of VW TL52329, while taking into account the characteristics of high temperature resistance, oil resistance, low pressure change, and low temperature resistance. difficulty

In order to make the ethylene acrylate rubber material meet the technical indicators of VW TL 52329 and increase the reliability of use in low temperature environments, the glass transition temperature Tg value of the ethylene acrylate rubber material needs to be ≤ -40°C, and the existing situation The Tg value of ethylene acrylate rubber materials can only reach -30~-35°C, and it is still necessary to find a suitable solution

[0004] In addition, when making low-temperature-resistant ethylene acrylate products, the existing automotive seal industry often chooses Vamac Ultra IP as the material for making seals because DuPont’s Vamac Ultra IP raw rubber has better low-temperature resistance than other brands. , but the oil resistance of Vamac Ultra IP is slightly worse than other brands, and it is difficult to meet the high oil resistance requirements

[0005] As we all know, the commonly used softening plasticizers in ethylene acrylate rubber that can meet the requirements of high and low temperature resistance include TP95, TP759, and RS-735, but when the amount is more than 20 parts, the good low temperature resistance performance can be highlighted and the price is relatively expensive. When it exceeds 20 parts, the oil resistance performance will decrease

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