The densely displayed pendant methyl groups in the molecular chain of butyl rubber will restrict the thermal movement of polymer molecules, give the rubber good air tightness, and produce rubber products with extremely low air permeability. Therefore, butyl rubber or butyl reclaimed rubber is widely used to produce various rubber products with high air tightness and low air permeability. Taking appropriate measures to improve the gas permeability resistance of butyl rubber can further improve the performance and life of butyl rubber products.
1. Increase the amount of sulfur appropriately
When using butyl rubber/reclaimed rubber to produce rubber products with strict requirements on air permeability resistance, appropriately increasing the amount of sulfur (or other vulcanizing agents) can increase the crosslink density of the rubber, increase the degree of vulcanization, and increase the compactness of the butyl 2LLYY129 vulcanized rubber . The higher the density of butyl vulcanizate, the greater the activation energy during the air-permeation process, and the more difficult it is for gas to penetrate.
2. Increase the amount of filler appropriately
In theory, the use of most fillers can reduce rubber permeability. In actual production, inorganic fillers with flake structure such as mica powder, talc powder and graphite are more effective in reducing the air permeability of butyl vulcanizate than spherical particle fillers; increasing the amount of these rubber fillers is equivalent to reducing the rubber in butyl vulcanizate The volume fraction of vulcanizate helps to improve the air permeability of vulcanized rubber. It should be noted that a large amount of inorganic fillers will cause a decrease in the mechanical strength of the butyl compound, so the amount needs to be controlled reasonably.
3. Appropriately reduce the amount of plasticizer
The use of softeners and plasticizers will increase the air permeability of vulcanized rubber. Therefore, when butyl rubber/reclaimed rubber is used to produce high air-tightness rubber products, the amount of plasticizer and operating oil should be minimized to avoid too large a Base vulcanizate is resistant to air permeability.
4. The raw materials must not contain impurities
Impurities mixed in the raw materials or production process of butyl rubber/reclaimed rubber products will cause defects on the surface or inside of the finished product, which will seriously affect the air tightness of butyl products. Therefore, when selecting raw and auxiliary materials for butyl rubber products, we must use products without impurities to ensure that the compounding agents, especially the large amount of fillers, are uniformly dispersed in the rubber compound, avoid agglomeration, and effectively prevent the increase in the air permeability of butyl vulcanizate. When necessary, the butyl rubber compound can be used after filtering; strictly control each production process to ensure clean environmental equipment and avoid mixing of impurities.
In the production process of high air-tightness butyl rubber products, rubber product manufacturers need to select appropriate types of raw and auxiliary materials according to actual needs, strictly control the quality of raw and auxiliary materials, production technology, and cleanliness of the production environment, and appropriately adjust the formula to further improve butyl rubber Material resistance to air permeability.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits