Butyl rubber has excellent gas permeability and heat resistance, and is widely used in the production of various heat-resistant rubber products, heat-resistant sponge foam rubber products is one of them. Many inner tube processing manufacturers know that the butyl inner tube processing process will add an appropriate amount of EPDM rubber or recycled rubber, the purpose is to extend the service life of the butyl inner tube. So is it necessary to add EPDM rubber when using butyl rubber raw heat resistant sponge foam rubber products? If so, what issues should be noted when adding?
1. The role of EPDM rubber in butyl heat-resistant sponge foam products
EPDM rubber / recycled rubber after aging hardness, butyl rubber products will be soft and sticky after aging, so the use of an appropriate amount of EPDM rubber in butyl heat-resistant sponge foam rubber products can make up for the defects of butyl rubber, improve the performance of butyl heat-resistant sponge foam products.
EPDM rubber / recycled rubber and butyl rubber, high temperature resistance, aging resistance (especially ozone resistance) than butyl rubber; butyl heat-resistant sponge foam products in the appropriate amount of EPDM rubber can improve the heat resistance of foam products, aging resistance, to further extend the service life of heat-resistant sponge.
2. Butyl heat-resistant sponge products in the EPDM rubber selection skills
The use of EPDM rubber material to improve the performance of heat-resistant sponge products, from the cost of using EPDM recycled rubber. EPDM unvulcanized rubber blend or waste EPDM rubber products recycled and reprocessed EPDM rubber high and low temperature resistance, anti-aging properties and EPDM rubber is basically the same, the price is much lower than the original EPDM rubber, and butyl rubber compatibility is better, can improve the comprehensive performance of butyl heat-resistant sponge products under the premise of reducing more raw material costs. For the physical and mechanical properties of more stringent requirements of heat-resistant sponge 2LLYY422-SJ products, rubber products manufacturers can be mixed with the appropriate amount of EPDM rubber in butyl rubber to ensure product quality.
3. How to adjust the EPDM rubber and butyl rubber vulcanization speed
As we all know, the vulcanization of sponge foam rubber products and foaming is carried out at the same time, the vulcanization speed than the foaming speed or faster than the foaming speed will affect the foaming effect of foaming products and foaming efficiency; butyl rubber and EPDM rubber vulcanization performance, vulcanization conditions are different, so rubber products manufacturers must be reasonable design of the vulcanization system to ensure that the vulcanization and foaming at the same time. In general, rubber products manufacturers can choose sulfur vulcanization, with the use of rubber accelerator DM, the use of foaming agent OBSH foam, better coordination between the speed of vulcanization and foaming speed.
The use of EPDM recycled rubber or EPDM rubber to improve the performance and life of the finished butyl heat-resistant sponge foam products, rubber products manufacturers also need to properly adjust the type and amount of other matching agents in the formula, you can use semi-reinforced carbon black reinforcement, paraffin oil softening, paraffin wax anti-aging, together with the use of zinc oxide, stearic acid and magnesium oxide, to further improve the butyl/EPDM rubber heat-resistant sponge foam products comprehensive The use of zinc oxide, stearic acid and magnesium oxide can further improve the overall performance and service life of butyl/EPDM heat resistant sponge products.
Post time: Apr-01-2021