What is insoluble sulfur?

adhesion. Insoluble sulfur, so called because it is insoluble in rubber, is a very high molec-ular weight polymeric form of sulfur. It mainly is used as a replacement for ordi-nary sulfur (the soluble form of sulfur) to prevent sulfur bloom in unvulcanized rubber compounds.

How does insoluble sulfur affect the performance of rubber compounds?

The use of insoluble sulfur can pre-vent sulfur migration between adjacent rubber compounds thus avoiding varia-tion in compound performance. Table IX. Processing and curing properties. Effect of HD OT 20. wide variations in storage and cur-ing temperatures. and their relationship to field perfor-mance can better be discussed and pre-dicted.

Why is insoluble sulphur a good curing agent?

Insoluble sulphur is the preferred curing agent for the majority of the rubber industry. By keeping insoluble sulphur dispersed in the oil, any risk of conversion is lowered, while still facilitating the incorporation of the curing agent into the rubber compound.

What is insoluble sulfur in rubber vulcanization?

Insoluble sulfur instability, in the rubber vulcanization temperature as high as the jkcan be reduced to ordinary sulfur, to complete the curing. Therefore, the application in tires and products is expanding.

How to determine the stability of insoluble sulfur at 105 °C?

At present, the approval of the national standard “rubber compound – sulfur – test method” equivalent to the international standard, there is “hot back to the original” test method to determine the stability of insoluble sulfur at 105 ℃, Period of stability.

Does insoluble sulfur prevent vulcanization?

The principle use of insoluble sulfur is to eliminate sulfur bloom on rubber compound prior to vulcanization, but ad-ditional benefits can be found from pre-venting migration of sulfur between rubber compounds in contact with each other.