Oil-resistant rubber products is an important category of rubber products industry, the general use of oil-resistant nitrile rubber production; in recent years, with the development of renewable rubber industry, production of nitrile rubber reclaimed continuously newest, nitrile rubber reclaimed product quality Getting better and better, so more oil-resistant rubber products manufacturers began to use nitrile rubber regeneration part or all of the raw materials to produce nitrile rubber products, significantly reducing raw material costs. The use of nitrile rubber reclaimed rubber production of rubber products, the curing time is too short will cause products under-sulfur, unfrozen phenomenon, so appropriate extension of nitrile rubber reclaimed vulcanization time to improve product performance is of great significance.
There are many ways to extend the vulcanization time of NR products, which can be achieved by lowering the curing temperature and adjusting the curing system.
1, to reduce the curing temperature: vulcanization temperature and curing time are mutually restrained, usually nitrile rubber reclaimed vulcanization temperature increased by 10 ℃, curing time reduced by about half; so by reducing the vulcanization temperature can be extended curing time, especially some of the relatively thick The oil products such as oil-resistant rubber plate is best to use low-temperature curing method for a long time to ensure uniform vulcanization, improve the overall performance of nitrile rubber plate.
2, adjust the curing system: There are many ways to adjust the curing system to extend the curing temperature, such as reducing the amount of sulfur in the curing system, because the sulfur as curing agent in the curing system, the greater the amount, the faster curing; accelerator in the curing system Can reduce the curing temperature and shorten the curing time to improve the curing efficiency of the curing system, so here by reducing the amount of accelerator can also extend the curing time, but need to be aware that must be set in the curing temperature and curing time is complete, and then By reducing the amount of accelerator to extend the curing time, otherwise it will affect the nitrile rubber products reclaimed vulcanization degree; addition of appropriate amount of delayed-effective sulfinamide accelerator to extend the nitrile rubber regeneration vulcanization time.
3, white carbon black as reclaimed rubber products filler, you can extend the curing time.
4, under normal circumstances, increasing the amount of softener, vulcanization time to extend a certain amount of help, it can be appropriate to increase the amount of rubber oil.
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