Heat-resistant rubber sheet needs to maintain stable performance in a high-temperature environment, and is generally processed from butyl rubber, EPDM rubber, chlorobutyl rubber, etc. as the main raw materials, with excellent heat resistance, and is widely used in high-temperature environments such as chemical industry, metallurgy, and electric power. With the intensification of market competition, the application of reclaimed rubber in the production of heat-resistant rubber sheets, as a new raw material to reduce the cost of rubber products, has gradually attracted attention. So which reclaimed rubber can be used to produce heat-resistant rubber sheets?
When using reclaimed rubber to reduce costs, it is necessary to focus on the heat resistance of reclaimed rubber and its compatibility with other rubbers (butyl rubber, EPDM, chlorobutyl rubber, etc.). The following three types of reclaimed rubber are ideal for reducing the production cost of heat-resistant rubber sheets.
1. EPDM reclaimed rubber
EPDM reclaimed rubber retains the basic performance characteristics of EPDM rubber, with excellent heat resistance, ozone resistance and weather resistance, and can be used alone or in combination with EPDM rubber, butyl rubber, etc. to produce heat-resistant rubber sheets, effectively reducing production costs. In practical applications, EPDM reclaimed rubber is usually peroxide vulcanized, combined with silica, zinc oxide, magnesium oxide, silicate and other fillers with good heat resistance, as well as polyester plasticizers or reactive softeners to further improve the heat resistance of EPDM reclaimed rubber sheets.
2. Butyl reclaimed rubber
Butyl reclaimed rubber retains the basic performance characteristics of butyl rubber, good air tightness, heat resistance, chemical resistance, and can replace part of butyl rubber to produce heat-resistant rubber sheets and reduce costs. In the production of heat-resistant rubber sheets, butyl reclaimed rubber can be used alone, or combined with butyl rubber, EPDM rubber, etc., butyl reclaimed rubber can also be used in combination with EPDM reclaimed rubber E4LYY723 to produce heat-resistant rubber sheets. When using butyl rubber and butyl reclaimed rubber as the main raw materials to produce heat-resistant rubber sheets, it is recommended to use resin vulcanization (such as phenolic resin) and cooperate with silica, zinc oxide, magnesium oxide, silicate and other fillers to obtain better heat resistance.
3. Chlorobutyl reclaimed rubber
Chlorobutyl reclaimed rubber has the basic performance characteristics of chlorinated butyl rubber, good air tightness, heat resistance, flex resistance, aging resistance, chemical corrosion resistance, and can be used with chlorinated butyl rubber, butyl rubber, natural rubber, EPDM rubber and other rubbers to produce heat-resistant rubber sheets, further delay the aging time of heat-resistant rubber sheets, and the comprehensive performance of the finished product is better. When using chlorinated butyl reclaimed rubber to reduce the production cost of heat-resistant rubber sheets, it is necessary to use high-efficiency heat-resistant antioxidants, and appropriately increase the amount of antioxidants, and it is recommended to use two or more antioxidants together.
When using EPDM reclaimed rubber, butyl reclaimed rubber, chlorinated butyl reclaimed rubber, etc. to reduce the production cost of heat-resistant rubber sheets, the design of vulcanization system, reinforcing filling system and softening plasticizing system directly affects the heat resistance of heat-resistant rubber sheets. In the future, Xiaobian will share with you the key points of formula design for the production of heat-resistant rubber sheets from different varieties of reclaimed rubber and the problems that need to be paid attention to in the production process.
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