The dense side methyl groups displayed in the butyl rubber molecular chain will limit the thermal movement of the polymer molecules, give the rubber good airtightness, and the rubber products produced have extremely low air permeability. Therefore, butyl rubber or butyl recycled rubber is widely used in the production of a variety of high air tightness, low air permeability of rubber products. Taking appropriate measures to improve the air permeability of butyl rubber materials can further improve the performance and life of butyl rubber products.
1. Appropriately increase the amount of sulfur
When using butyl rubber/recycled rubber to produce rubber products with strict requirements for air permeability, appropriately increasing the amount of sulfur (or other vulcanizing agents) can improve the crosslinking density of the rubber compound, increase the degree of vulcanization, and increase the denstrictity of butyl 2LLYY129WFM vulcanized adhesive. The more dense the butyl vulcanized adhesive has the greater activation energy during the ventilation process, and the more difficult it is for the gas to penetrate.
2. Appropriately increase the amount of filler
Theoretically, the use of most fillers can reduce rubber permeability. In actual production, mica powder, talc, graphite and other inorganic fillers with flake structures can effectively reduce the permeability of butyl vulcanized rubber more effectively than spherical particle fillers; increasing the amount of these rubber fillers is equivalent to reducing the volume fraction of rubber in butyl vulcanized rubber, which helps to improve the air permeability of vulcanized rubber. It should be noted that the large use of inorganic fillers will lead to a decrease in indicators such as the mechanical strength of butyl rubber, so the dosage needs to be reasonably controlled.
3. Appropriately reduce the amount of plasticizer
The use of softeners and plasticizers will increase the breathability of vulcanized rubber, so the amount of plasticizer and operating oil should be minimized when producing highly airtight rubber products with butyl rubber/recycled rubber, so as to avoid the amount of butyl vulcanized rubber that affects the air permeability of butyl vulcanized rubber.
4. Raw materials must not contain impurities
The inclusion of impurities in the raw materials or production process of butyl rubber/recycled rubber products will cause defects on the surface or inside of the finished product, which will seriously affect the airtightness of butyl rubber products. Therefore, when selecting raw materials and excipients used in butyl rubber products, we must use products without impurities to ensure that the compound, especially the filler with a large amount, is evenly dispersed in the rubber material, avoids clumping, and effectively prevents the increase in the permeability of butyl vulcanized glue. If necessary, the butyl compound can be used after filtration; strictly control each production process to ensure that the environmental equipment is clean and avoids impurities.
In the production process of highly airtight butyl rubber products, rubber product manufacturers need to select suitable varieties of raw materials according to actual needs, strictly control the quality of raw materials, production processes, production environment cleanliness, etc., appropriately adjust the formula, and further improve the air permeability of butyl rubber materials.
For more information about the hermetic formulation and tips for using butyl rubber, you can write to me privately.