Composition of rubber

Natural rubber is made from latex, and a portion of the non rubber components contained in latex remain in solid natural rubber. Generally, natural rubber contains 92% -95% rubber hydrocarbons, while non rubber hydrocarbons account for 5% -8%. Due to different production methods, production areas, and even different rubber picking seasons, the proportion of these components may vary, but they are basically within the range.

Protein can promote the vulcanization of rubber and delay aging. On the other hand, proteins have strong water absorption, which can cause rubber to absorb moisture, mold, and reduce insulation. Proteins also have the disadvantage of increasing heat generation.

Acetone extracts are some advanced fatty acids and sterols, some of which act as natural antioxidants and accelerators, while others can help disperse powdered additives during mixing and soften raw rubber.

Ash mainly contains salts such as magnesium phosphate and calcium phosphate, with a small amount of metal compounds such as copper, manganese, and iron. Because these variable valence metal ions can promote rubber aging, their content should be controlled.

The moisture content in dry rubber does not exceed 1% and can evaporate during processing. However, if the moisture content is too high, it not only makes the raw rubber prone to mold during storage, but also affects the processing of the rubber, such as the tendency of the compounding agent to clump during mixing; During the rolling and extrusion process, bubbles are easily generated, while during the vulcanization process, bubbles or sponge like structures are produced.