Composition of rubber: Natural rubber is made of latex, and some non-rubber components contained in latex remain in solid natural rubber. Generally, natural rubber contains 92%-95% rubber hydrocarbons, and non-rubber hydrocarbons account for 5%-8%. Due to different preparation methods, different producing areas and even different rubber picking seasons, the proportion of these components may be different, but they are basically within the range.
Protein can promote the vulcanization of rubber and delay the aging. On the other hand, protein has strong water absorption, which will lead to moisture absorption and mildew of rubber and decrease its insulation. Protein also has the disadvantage of increasing heat production.
Acetone extract is some higher fatty acids and sterols, some of which act as natural antioxidants and accelerators, while others can help powder compound components disperse and soften raw rubber during mixing.
Ash mainly contains salts such as magnesium phosphate and calcium phosphate, and a small amount of metal compounds such as copper, manganese and iron. Because these valence-changing metal ions will promote rubber aging, their content should be controlled.
The moisture in dry rubber does not exceed 65438 0%, which can be volatilized during processing. However, if the moisture content is too high, it will not only make the raw rubber easy to mold during storage, but also affect the rubber processing, such as the compounding agent is easy to agglomerate during mixing; Bubbles are easily generated during calendering and extrusion, and bubbles or sponginess are generated during vulcanization.