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First: raw rubber system 1) rubber and plastic is also a very common means, and the use of high styrene, PVC / NBR alloy effect can also increase the hardness. 2) change the way the rubber grade, can also improve the hardness (less used).
Second: vulcanisation promotion system 1) by increasing the vulcanising agent to increase the density of cross-chaining, improve the hardness, such as increasing the amount of sulphur to increase substantially in the production of recycled rubber products, other materials remain unchanged, add the corresponding amount of sulphur can be to a certain extent to improve the hardness of rubber products. (100 parts of rubber, sulfur dosage of up to 4-5 parts) 2) add resin. In the manufacture of recycled rubber products at the same time the resin added to it can increase the hardness of rubber products. 3) Part of the second vulcanisation of the product to increase the degree of crosslinking, improve the hardness.
Third: Reinforcement filling system 1) Add carbon black. Carbon black can be used as a filler in the rubber mixture so that the hardness of rubber products change. 2) Carbon black varieties replaced, under the premise of the rubber content rate remains unchanged, the hardness can also be increased dramatically. 3) Adding rubber powder, the hardness becomes higher, and the effect is also very good, but also only suitable for moulding products oh. Fourth: plasticising softening system to reduce the amount of rubber oil. Rubber oil plays a softening effect, in adding rubber products in the thermal expansion, reduce the interaction force between the polymer. Reducing the amount of rubber oil is equivalent to reducing the softening effect of the rubber products, and play a role in improving the hardness.
Second: vulcanisation promotion system 1) by increasing the vulcanising agent to increase the density of cross-chaining, improve the hardness, such as increasing the amount of sulphur to increase substantially in the production of recycled rubber products, other materials remain unchanged, add the corresponding amount of sulphur can be to a certain extent to improve the hardness of rubber products. (100 parts of rubber, sulfur dosage of up to 4-5 parts) 2) add resin. In the manufacture of recycled rubber products at the same time the resin added to it can increase the hardness of rubber products. 3) Part of the second vulcanisation of the product to increase the degree of crosslinking, improve the hardness.
Third: Reinforcement filling system 1) Add carbon black. Carbon black can be used as a filler in the rubber mixture so that the hardness of rubber products change. 2) Carbon black varieties replaced, under the premise of the rubber content rate remains unchanged, the hardness can also be increased dramatically. 3) Adding rubber powder, the hardness becomes higher, and the effect is also very good, but also only suitable for moulding products oh. Fourth: plasticising softening system to reduce the amount of rubber oil. Rubber oil plays a softening effect, in adding rubber products in the thermal expansion, reduce the interaction force between the polymer. Reducing the amount of rubber oil is equivalent to reducing the softening effect of the rubber products, and play a role in improving the hardness.
