High temperature resistant sealing element and preparation method thereof

Abstract

The invention discloses a high temperature resistant sealing element and a preparation method thereof. The high temperature resistant sealing element is prepared from the following main components inparts by weight: 50-60 parts of nitrile rubber, 20-25 parts of fluororubber, 20-25 parts of microporous polytetrafluoroethylene, 10-15 parts of glass fibers, 3-6 parts of an antiaging agent, 2-5 partsof antioxidant, 2-5 parts of vulcanizer, 3-5 parts of carbon fibers, 3-5 parts of nano-silicon dioxide, 2-5 parts of titanium nitride, 1-3 parts of boron nitride and 2-5 parts of modified graphite. The preparation method comprises the following steps: (1) adding nitrile rubber and fluororubber for independent plasticating, mixing in an open mill in the ratio, uniformly mixing and milling; (2) adding other raw materials into mixing equipment, uniformly milling at 70-100 DEG C, extruding and pre-molding; and (3) molding and vulcanizing on a flat vulcanizing machine for 6-10 minutes at 170-200 DEG C. The high temperature resistant sealing element can adapt to high temperature and low temperature conversion environments, and is good in sealing effect and long in service cycle; and the preparation method is simple, is easy for industrialization, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of seals, and in particular relates to a high-temperature-resistant seal and a preparation method thereof. Background technique [0002] Rubber seals are a common basic component in sealing devices, which play a very important role in the contradiction between leakage and sealing, and are a type of rubber products widely used in sealing technology. Rubber seals have good elasticity and a wide temperature range. Small stresses in different media will produce large deformations. This deformation can provide contact pressure, compensate for leakage gaps, and achieve the purpose of sealing. [0003] Due to the viscosity of downhole crude oil in heavy oil thermal recovery wells, the pumping unit must be stopped frequently during the production process, and high-temperature steam is injected into the oil well to reduce the viscosity of downhole crude oil. After a few days of steam injection, the pumping unit must ...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent application with application number CN2010101524877 discloses "a preparation method of high temperature and high pressure resistant rubber sealing material". First, 100 parts of hydrogenated nitrile rubber is weighed in proportion by weight, put into an open mill for mastication, and then the metal 2-20 parts of oxide, 1-5 parts of stearic acid, 5-100 parts of acrylate, 10-70 parts of carbon black, 1-6 parts of anti-aging agent, 5-30 parts of plasticizer, 2-10 parts of anti-scorch agent Parts, 2-10 parts of vulcanizing agent and 2-10 parts of vulcanizing aid, add to the open mill in turn and knead until evenly mixed, vulcanize the mixed rubber in a flat vulcanizing agent for one stage, and control the vulcanization temperature at 150-180°C , the vulcanization time is 20-40 minutes, the vulcanization pressure is 10-20MPa, after the rubber is taken out from the flat vulcanizer, it is subjected to two-stage vulcanization at a temperature of 150-180°C to obtain a vulcanized rubber with excellent performance. The process is simple, but The highest temperature resistance is 150°C, and the temperature of thermal recovery wells for heavy oil can generally reach 200°C. This invention obviously does not meet the actual production application

Images