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15
2024
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08
Heat resistance of rubber products
The heat resistance of a rubber article refers to its ability to resist changes in physical properties in a high temperature environment. This mainly depends on the molecular structure of the rubber, such as the number of unsaturated bonds contained in the molecular chain. At the same time, the vulcanization system of rubber also has an important influence on its heat resistance.
The heat resistance of a rubber article refers to its ability to resist changes in physical properties in a high temperature environment. This mainly depends on the molecular structure of the rubber, such as the number of unsaturated bonds contained in the molecular chain. At the same time, the vulcanization system of rubber also has an important influence on its heat resistance.
Type of rubber with good heat resistance
- Hydrogenated nitrile rubber (HNBR): It has high mechanical strength and wear resistance, and its heat resistance is better than that of ordinary nitrile rubber (NBR) when cross-linked with peroxide. In addition, HNBR also shows good flame retardant, solvent resistance and resistance to most chemicals and acid and alkali resistance.
- Silicone rubber: Because the main chain in its molecular structure is-Si-O-Si-, it gives it excellent heat resistance and can maintain stable performance at high temperatures.
Ways to improve heat resistance
- The heat resistance of vulcanized rubber is improved by adopting low sulfur and high promotion, effective vulcanization system, balanced vulcanization system and peroxide crosslinking system.
- Add a variety of efficient protection systems, such as antioxidants, heat stabilizers, etc., to improve the heat resistance of the compound.
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