Nitrile reclaimed rubber is not only excellent in oil resistance, but also good in heat resistance and wear resistance. Therefore, it can also be used to produce heat-resistant and wear-resistant rubber products, which can significantly reduce the cost of raw materials, such as the production of heat-resistant sealing products using nitrile reclaimed rubber. When designing NBR reclaimed rubber heat-resistant sealing product formulations, the selection of raw materials for nitrile regenerated rubber, the design of vulcanization system, selection of plasticizers and antioxidants will all affect the heat resistance and sealing performance of the heat-resistant nitrile reclaimed rubber sealing products.
1, nitrile reclaimed rubber raw material selection
Acrylonitrile content of nitrile reclaimed rubber directly affects the heat resistance of nitrile reclaimed rubber. Different nitrile reclaimed rubber from different manufacturers has different acrylonitrile content due to different raw materials used and different production processes. Under normal circumstances, the higher the acrylonitrile content of the nitrile rubber reclaimed rubber, the better the oil resistance, the better the heat resistance, and the worse the cold resistance. Therefore, depending on the use of the heat-resistant sealing strip, the acrylonitrile content of the nitrile should be selected. Glue, more choice of high acrylonitrile content of nitrile reclaimed rubber.
2. Vulcanizing system design of nitrile reclaimed rubber sealing products
The commonly used vulcanization systems of reclaimed rubber products include sulfur vulcanization systems and peroxide vulcanization systems. Among them, reclaimed rubber products vulcanized with sulfur vulcanization systems have good fatigue resistance and high mechanical strength. After curing, peroxide cured vulcanized nitrile regenerated rubbers. The rubber material has good heat resistance and small compression set; the effective vulcanization system in the sulfur vulcanization system and the vulcanized nitrile rubber compound in the semi-effective vulcanization system have a long scorch time, a small amount of vulcanization, small compression deformation, and heat resistance. Excellent. When using nitrile reclaimed rubber to produce heat-resistant sealing products, an effective curing system (sulfur content of 0.5 parts or less) can be used to ensure good heat resistance and sealing performance of the nitrile reclaimed rubber sealing products; Heat-sealed products can also be sulphur/DCP vulcanizing systems.
3, nitrile reclaimed rubber heat sealing products other compounding agent selection
The acrylonitrile content of nitrile regenerated rubber and the design of reclaimed rubber vulcanization system all affect the heat resistance and sealing performance of nitrile regenerated rubber heat-resistant sealing products. Other compounding agents, including softeners, plasticizers, and antioxidants, also affect it. Use performance and service life. Amine antioxidants have good protective effect against hot oxygen aging. They can add 4010NA of paraffin wax to the heat-resistant nitrile reclaimed rubber sealing products. If you need to further improve the aging resistance of heat-resistant sealing products, 4010NA is best used with paraffin wax and 445. The coumarone in the plasticizer is relatively stable under high temperature conditions and can be used as a plasticizer for heat-resistant nitrile regenerated rubber sealing products.
In fact, the factors that affect the heat resistance and sealing performance of heat-resistant nitrile reclaimed rubber sealing products are not limited to this. The filler selection, curing time, and vulcanization temperature design of heat-resistant sealing products will affect the performance of NBR heat-resistant reclaimed rubber sealing products. With life expectancy.
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