Preparing method of polysulfide rubber sealing ring

Abstract

The invention discloses a preparing method of a polysulfide rubber sealing ring. The preparing method comprises the steps of 1, weighing raw materials, wherein liquid polysulfide rubber, propionate, epoxy groups, bisphenol-A epoxy resin, a plasticizer, a tackifier, a softener, a reinforcing agent, a flame retardant, a vulcanizing agent and a filler are weighed according to the following mass fraction; 2, modifying the liquid polysulfide rubber, wherein after the polysulfide rubber is subjected to end-capped modification through the propionate and the epoxy groups, modified polysulfide rubber is obtained; 3, pretreating the raw materials, wherein after the plasticizer is added into the liquid modified polysulfide rubber, plastifying is conducted on an open mill; 4, preparing a premix material, wherein the tackifier, the softener, the reinforcing agent, the flame retardant and a sizing material are uniformly mixed in a mixing mill, and then the filler and the vulcanizing agent are addedto continue mixing; 5, conducting vulcanization molding, wherein a mixed rubber compound is added into a mold of vulcanization equipment for vulcanization to obtain a vulcanized sealing ring green body; 6, conducting ageing resistance and trimming treatment.

Description

technical field [0001] The invention relates to the field of sealing materials, in particular to a preparation method of a polysulfide rubber sealing ring. Background technique [0002] The sealing ring is a material or part that prevents fluid or solid particles from leaking from adjacent joint surfaces and prevents impurities such as external dust or water from intruding into the internal parts of the machine equipment. The sealing ring generally works under certain pressure and temperature conditions. Sealing rings with different structures and materials have different sealing effects under different conditions. Although they have excellent bonding, sealing, aging resistance and mechanical properties, the current two-component polysulfide sealing materials are not convenient for construction. It is easy to burn and has poor flame retardancy; once the seal of the sealing ring fails, it will directly affect the use of the equipment. Polysulfide rubber is a synthetic rubber...

AI Technical Summary

Problems solved by technology

[0002] The sealing ring is a material or part that prevents fluid or solid particles from leaking from adjacent joint surfaces and prevents impurities such as external dust or water from intruding into the internal parts of the machine equipment. The sealing ring generally works under certain pressure and temperature conditions. Sealing rings with different structures and materials have different sealing effects under different conditions. Although they have excellent bonding, sealing, aging resistance and mechanical properties, the current two-component polysulfide sealing materials are not convenient for construction. It is easy to burn and has poor flame retardancy; once the seal of the sealing ring fails, it will directly affect the use of the equipment

Polysulfide rubber is a synthetic rubber obtained by polycondensation of dihalogenated alkanes and polysulfides of alkali metals or alkaline earth metals. It has excellent oil resistance and solvent resistance, but its strength is not high, its aging resistance is not good, and its processing performance is not good.

[0003] At present, due to the poor aging resistance of the rubber sealing ring, the service life of the sealing ring will be shortened. At the same time, the aging sealing ring will bond with the metal, the mechanical properties will deteriorate, and the thermal stability will drop sharply. Therefore, a kind of Preparation method of rubber sealing ring capable of flame retardancy, aging resistance and good sealing effect

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