Rubber formula of stearic acid and zinc oxide (available CR510 instead of zinc oxide)

Zinc oxide and stearic acid activation system in sulfur curing system, its main function is as follows:

1, the activation vulcanization system:

ZnO and SA effects generated zinc soap and improves the ZnO solubility in the rubber, with good solubility in rubber "formed by the promoter of complex, activate the promoter and sulfur, raise the efficiency of sulphur.

2, increase the crosslinking density of the vulcanizates:

ZnO and SA to generate soluble zinc salt, zinc salt and crosslinking key chelate, protect the weak link, sulfurized generate short crosslinking key, and adds new crosslinking key, improves the crosslink density.

3, improve the aging resistance performance of vulcanized rubber:

Vulcanizates in use process, more sulfur bond rupture, the generated hydrogen sulfide will accelerate the aging of rubber, but ZnO and hydrogen sulfide generated zinc sulfide, consumption of hydrogen sulphide, reduce the catalytic decomposition of hydrogen sulfide on the crosslinking network;

Also, ZnO can suture disconnect sulphur keys, stable effect to the cross-linking bond.

4, reflect different mechanism:

In different vulcanizing system, the mechanism of the different vulcanization accelerator has the very big difference, ZnO and the role of zinc stearate SA reaction intermediates and separate use of zinc stearate, the mechanism is not the same.

In formula design, therefore, need to choose according to different design suitable to cooperate.

Using the company's low zinc CR510 of surfactant, is 50% of ordinary zinc oxide, zinc content of green environmental protection, and greatly reduce the cost of rubber vulcanization.