Butyl rubber is excellent in gas permeability and heat resistance, and is widely used in the production of various heat-resistant rubber products. Heat-resistant sponge foam rubber products are one of them. Many inner tube processing manufacturers know that the proper amount of EPDM rubber or reclaimed rubber will be added to the process of butyl inner tube processing in order to extend the service life of butyl inner tube. Is it necessary to add EPDM compound when using butyl rubber raw heat-resistant sponge foam rubber products? If necessary, what issues should be noted when adding?
1. The role of EPDM compound in butyl heat-resistant sponge foam products
The hardness of EPDM rubber / recycled rubber increases after aging, and the butyl rubber products will become soft and sticky after aging. Therefore, the appropriate amount of EPDM rubber material is just right for butyl heat-resistant foam foam rubber products. It can make up for the defects of butyl rubber and improve the performance of butyl heat-resistant sponge foam products.
Compared with butyl rubber, EPDM / recycled rubber is superior to butyl rubber in high temperature resistance and aging resistance (especially ozone resistance); butyl heat-resistant sponge foam products 2LLYY422 use moderate amount of EPDM Acrylic rubber can improve the heat resistance and aging resistance of foam products, and further extend the service life of heat-resistant sponge.
2. Selection skills of EPDM compound in butyl heat-resistant sponge products
When using EPDM compound to improve the performance of heat-resistant sponge products, the editor recommends the use of EPDM reclaimed rubber in terms of cost. EPDM reclaimed rubber recovered from EPDM unvulcanized compounded rubber or waste EPDM rubber products is resistant to high and low temperatures, and its aging resistance is basically the same as that of EPDM raw rubber, but its price is lower than that of EPDM The raw rubber is much lower and has better compatibility with butyl rubber, which can reduce more raw material costs on the premise of improving the overall performance of butyl heat-resistant sponge products. For heat-resistant sponge products with stricter physical and mechanical performance requirements, rubber product manufacturers can mix an appropriate amount of EPDM in butyl rubber to ensure product quality.
3. How to adjust the curing speed of EPDM compound and butyl compound
As we all know, the vulcanization and foaming of sponge foam rubber products are carried out at the same time. The vulcanization speed slower than the foaming speed or faster than the foaming speed will affect the foaming effect and foaming efficiency of the foamed products; butyl rubber and EPDM The vulcanization performance and vulcanization conditions of acrylic rubber materials are different, so rubber product manufacturers must design the vulcanization system reasonably to ensure that vulcanization and foaming proceed simultaneously. Under normal circumstances, rubber product manufacturers can choose sulfur vulcanization, with the use of rubber accelerator DM, foaming agent OBSH foaming, better coordination of vulcanization speed and foaming speed.
When using EPDM reclaimed rubber or EPDM raw rubber to improve the performance and life of the finished butyl heat-resistant sponge foam products, rubber product manufacturers also need to appropriately adjust the types and dosages of other compounding agents in the formula. Strong carbon black reinforcement, paraffin oil softening, paraffin anti-aging, and then combined with zinc oxide, stearic acid and magnesium oxide, to further improve the overall performance and service life of butyl / EPDM rubber heat-resistant sponge foam products.