Cold-resistant seal ring based on graphene/polymer composite material and preparation method

Abstract

The invention discloses a cold-resistant seal ring based on a graphene/polymer composite material. The composite material utilizes a polymer as a matrix and graphene as filler. The cold-resistant seal ring is prepared through steps as follows: (1), graphene is poured into an alcoholic solution, a suspension containing graphene and the alcoholic solution in a mass ratio being 1:10-1:50 is prepared, and a uniform graphene solution is prepared by an ultrasonic disperser; (2), fluororubber, a plasticizer dicyclohexyl phthalate and the like are added to a grinding machine and ground for 25-36 h; (3), a mixture obtained through grinding is added to the graphene solution obtained in the step (1), and a mixed solution is obtained; (4), the mixed solution obtained in the step (3) is mixed in a closed rubber mixing mill for 2 min, then the plasticizer dicyclohexyl phthalate, an anti-aging agent octylated diphenylamine and the like are sequentially added, the mixing temperature is 85-105 DEG C, the mixing time is 2 h, then the temperature is increased to 185-200 DEG C at a speed of 10 DEG C/min, and a piece is formed through stamping and cooled naturally. The problem of poor cold resistance of the cold-resistant seal ring prepared from a fluororubber seal ring as a main material is solved simply and reasonably.

Description

technical field [0001] The invention relates to a patent and relates to a preparation method of a cold-resistant sealing ring, in particular to a cold-resistant sealing ring based on a graphite / polymer composite material and a preparation method thereof. Background technique [0002] At present, the rubber cold-resistant sealing rings used in the braking devices of construction machinery such as diesel engines and fuel systems need to have excellent weather resistance, ozone resistance and chemical resistance, but poor cold resistance. However, the rubber cold-resistant sealing rings currently used are generally copolymers of vinyl fluoride and hexafluoropropylene. Although it can seal DOT3 brake fluid, the apron swells severely in the spindle oil brake fluid, reduces hardness and strength, resulting in oil leakage and loss of The sealing effect, especially in the process of use, caused the three-guarantee product to be too high. Customers responded a lot to this and asked ...

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Problems solved by technology

[0006] In order to solve the above problems, the invention provides a high-strength cold-resistant sealing ring based on graphene / polymer composite materials and a preparation method, which avoids the defects of poor cold resistance in the prior art, and the waste brick adobe added in the rubber mixing does not fully reach the Particle size requirements lead to deviations in particle size distribution. If these factors are not well controlled, they will affect the stability of the mud and affect the molding quality.

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