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Working time of high temperature rubber flexible joint under high temperature aging effect

Time: 03-07 󰃯 Reading times: 570 󰃳 Editor in charge: The sea 󰃗 Column: product focus

Introduction: Generally, under the action of high temperature and long time aging, maintaining the original physical ability is called heat resistance. The heat resistance of vulcanizate determines the service time of rubber joint. Under the action of high temperature or thermal oxygen, the organic chemical structure of rubber changes, and macromolecules degrade, depolymerize and cross

Generally, under the action of high temperature and long time aging, maintaining the original physical ability is called heat resistance. The heat resistance of vulcanizates is determined Rubber joint Time of use. Under the action of high temperature or thermal oxygen, the organic chemical structure of rubber changes, macromolecule degradation, depolymerization, crosslinking, cyclization, isomerization, unsaturation changes, carbonyl group and other oxygen-containing groups or small molecular compounds are formed on the molecular chain, thus releasing volatile substances. The above changes are related to rubber type and rubber composition, temperature, mechanical action and peripheral substances of

From the perspective of formula design, the key to improve the heat resistance of rubber joint is as follows: first, select the rubber with good heat resistance and thermal oxygen stability, and its chemical structure has high heat resistance; second, on the basis of rubber types, select high temperature resistant curing system to improve the temperature resistance of vulcanizate; third, develop excellent thickener system to improve rubber workers The ability of arts to protect against heat and oxygen.
Silicone rubber is a kind of rubber with high heat resistance level in all kinds of rubber. The service life of silicone rubber at different temperatures. When silicone rubber is thermally embrittled in gas, crosslinking occurs, and the reduction of elongation at break is much greater than that of tensile strength.
The dry hot gas resistance of silicone rubber is better, but it is not resistant to damp heat aging. When there is too much water in the gas or in the sample, the vulcanizate will dissolve obviously. When silicone rubber was aged at 315 ℃ for 24h in the air with humidity of 7g / m3, the strength of vulcanizate was basically unchanged, but when it was moderately 180g / m3, the sample was damaged. In addition, silicone rubber will dissolve obviously under the airtight aging standard, which will deteriorate the performance.
The key to the temperature resistance of silicone rubber lies in its molecular structure: methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, the high temperature of long-term use is 250 ℃;
Because of its excellent comprehensive performance, it is widely used in chemical plants, buildings, water supply and drainage, drainage pipelines, crude oil, light and light industry, refrigeration, environmental sanitation, plumbing installation, fire safety, power engineering and other basic projects.
To produce rubber, oil and natural gas as raw materials, diene and olefin as a single polymer polymer polymer. The polymer of rubber has already improved the technology of single polymer, which is made of polymer, and the cost is quite low.