Butyl reclaimed rubber not only has excellent air tightness, but also has good heat resistance, and can be used in the production of heat-resistant rubber products such as heat-resistant conveyor belts, significantly reducing raw material costs. Rational design of butyl reclaimed rubber heat-resistant rubber product formula can effectively improve the heat resistance of heat-resistant rubber products and increase the service life of rubber products.
1, butyl heat resistant reclaimed rubber products vulcanizing agent selection
At present, vulcanization systems commonly used in the production of rubber products include sulfur vulcanization systems, resin vulcanization systems, and peroxide vulcanization systems. Among them, the heat resistance of butyl regenerated rubber vulcanizates after vulcanization using a peroxide curing system and a resin vulcanization system is improved. Good, benzoquinone dioxime and phenolic resin are good choices, the use of resin cured butyl regenerated rubber vulcanizate crosslinking cross-linked network stability is better. Therefore, butyl heat regenerative rubber products are more inclined to use resin as a vulcanizing agent.
2, butyl heat reclaimed rubber products protective agent collocation
Heat-resistant rubber products have the highest requirements for heat resistance. Therefore, heat-resistant butyl reclaimed rubber products need to be selected with high-efficiency heat-resistant antioxidants, and amine-based antioxidants have little protective effect in butyl regenerated rubber products. The best choice is phenolic antioxidants. For example, antioxidant 2246, dialkyl phenol sulfides, etc., significantly improve the heat resistance of butyl regenerated rubber heat-resistant rubber products; butyl heat regenerative rubber products are prone to fatigue aging in high-temperature environments, so they need to be used with Anti-fatigue anti-aging agent, comprehensively improve the heat resistance of butyl heat regenerative rubber products and prolong their service life.
3, butyl heat regenerative rubber products filler species: inorganic silica, active zinc oxide, magnesium oxide, alumina and silicate heat resistance is good, can be used as butyl heat regenerative rubber products Fillers such as silica can significantly increase the heat resistance of butyl regenerated rubber products.
4. The amount of softening agent for butyl heat-resistant regenerated rubber products: The relatively low molecular weight softeners tend to migrate at high temperature, resulting in a significant decrease in the physical and mechanical indexes of the heat-resistant butyl regenerated rubber products. Therefore, the thermal stability of the heat-resistant IIR regenerated rubber products needs to be selected. Good softeners that are not easy to use, such as polyester plasticizers with relatively high molecular weight, coumarone resin, petrolatum, paraffin oil, and petroleum resins. When using gumarone as a softener in butyl regenerated rubber heat-resistant remanufactured rubber products, the amount of softener should not exceed 5 parts.
There is much to be noted about the design of butyl heat-resistant reclaimed rubber products. Do you have any good suggestions?
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