Manufacturing technique of automobile engine seal gasket

Abstract

The invention discloses a manufacturing process of an automobile engine sealing gasket. The invention uses raw nitrile rubber as a raw material, modifies the nitrile rubber with a small amount of acrylate rubber, firstly swells and dissolves it in a solvent, and then under the condition of mechanical stirring, successively Add reinforcing filler, active agent, anti-aging agent, vulcanizing agent, plasticizer and other additives, stir and mix evenly, and dilute with a solvent to a suitable viscosity, and apply it to the surface-treated metal plate by dip coating On, vulcanization molding, the preparation of nitrile and acrylic compound sealing gasket with rubber metal.

Description

technical field [0001] The invention relates to a manufacturing process of an automobile engine sealing gasket. Background technique [0002] At present, asbestos sealing gaskets are generally still used in China, but asbestos gaskets have disadvantages such as insufficient strength, low compression rate, easy damage and poor sealing performance, and asbestos is recognized as a carcinogen, harmful to the body and not environmentally friendly, so it is urgently needed Developed new sealing materials. [0003] Nitrile rubber has good overall performance. Low-acrylonitrile-butadiene nitrile rubber has better low-temperature performance. Although the brittleness temperature can reach -50°C, as the content of acrylonitrile increases, the heat and oil resistance properties increase, which can be However, the low temperature resistance decreases, and at the same time, due to the existence of double bonds, it has medium and low heat resistance, and the use temperature is low. If th...

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Problems solved by technology

[0002] At present, asbestos sealing gaskets are generally still used in China, but asbestos gaskets have disadvantages such as insufficient strength, low compression rate, easy damage and poor sealing performance, and asbestos is recognized as a carcinogen, harmful to the body and not environmentally friendly, so it is urgently needed Developed new sealing materials

[0003] Nitrile rubber has good overall performance. Low-acrylonitrile-butadiene nitrile rubber has better low-temperature performance. Although the brittleness temperature can reach -50°C, as the content of acrylonitrile increases, the heat and oil resistance properties increase, which can be The low temperature resistance performance is reduced, and at the same time, due to the existence of double bonds, it has medium and low heat resistance, and the use temperature is low. If the use temperature exceeds 150 ° C, the sealing product will fail quickly

Therefore, for a long time, the low temperature resistance and heat resistance of nitrile rubber have not been well balanced.

Recently, several large and medium-sized automobile manufacturers and machinery factories require the continuous use temperature of sealing products to be above 150°C. Acrylic ester rubber has excellent heat and oil resistance, second only to fluororubber, and can meet this requirement, but it is cold-resistant Sex is not ideal