Oil-resistant raw material for preparing fluorinated silicone rubber-modified silicone rubber

Abstract

The invention discloses an oil-resistant raw material for preparing fluorinated silicone rubber-modified silicone rubber. The raw material is characterized by comprising the following components in parts by mass: 50-90 parts of methyl vinyl silicone rubber, 10-50 parts of methyl vinyl trifluoro-propyl silicone rubber, 30-40 parts of fumed silica, 1-3 parts of high-activity magnesia, 0.5-2.5 parts of AN (Acrylic Nitrile)-3, 2-5 parts of dimethyldimethoxysilane, 50-90 parts of kieselguhr, 40-80 parts of titanium pigment and 0.5-1.2 parts of 2,5-dimethyl-2,5-ditert-butyl hexane peroxide. By adopting the raw material, the oil resistance of the silicone rubber is effectively improved, the volume change of ASTM resistant 3# oil (150 DEG C*70h) is not greater than 15 percent, and a formula can be applied to oil resistant occasions by partially substituting the fluorinated silicone rubber.

Description

technical field [0001] The invention belongs to the technical field of rubber, and in particular relates to a raw material for preparing methyl vinyl trifluoropropyl silicone rubber (fluorosilicone rubber) modified oil-resistant silicone rubber. Background technique [0002] Due to its special molecular structure, silicone rubber has excellent high and low temperature resistance, ozone resistance, chemical corrosion resistance and electrical properties. Therefore, silicone rubber has been widely used in various aspects of the national economy, especially in the automotive industry. Wide range of applications. However, due to the poor resistance of silicone rubber itself to non-polar oils, this greatly limits the scope of application of silicone rubber, and with the improvement of people's awareness of environmental protection, higher and higher requirements have been put forward for automobile emissions and fuel penetration. Requirements, traditional silicone rubber has bee...

AI Technical Summary

Problems solved by technology

However, due to the poor resistance of silicone rubber itself to non-polar oils, this greatly limits the scope of application of silicone rubber, and with the improvement of people's awareness of environmental protection, higher and higher requirements have been put forward for automobile emissions and fuel penetration. Requirements, traditional silicone rubber has been difficult to meet these requirements

Some manufacturers use fluorosilicone rubber instead of silicone rubber for some oil-resistant occasions, but due to the high price of fluorosilicone rubber, it is difficult to promote the use

In some occasions, such as automotive turbocharger hoses, some manufacturers use a composite structure of silicone tubes lined with fluorosilicone rubber. However, due to the difficulty in bonding fluorosilicone rubber and silicone rubber, this composite structure hose requires complex processes. can achieve