When rubber is used to make natural rubber, some non-ru […]
When rubber is used to make natural rubber, some non-rubber hydrocarbon components remain in the solid natural rubber. In general solid natural rubber, non-rubber hydrocarbons account for 5% to 8%, as shown in Table 1-2. Rubber hydrocarbons account for 92% to 95%. Fresh latex contains two kinds of egg endoplasm, a protein and rubber protein. The protein is easy to absorb moisture, mold, reduce electrical insulation, increase heat generation, make some people who are exposed to it allergic; protein decomposition products promote vulcanization, delayed aging; granular protein has an enhanced effect.
Acetone extract refers to the portion of non-rubber hydrocarbons in the NT that is soluble in acetone, mainly composed of lipids and its decomposition products. The lipids in fresh latex are mainly composed of fats, waxes, sterols, sterols and phospholipids. After the latex is added with ammonia, some components in the lipid are decomposed to produce fatty acids such as stearic acid and oleic acid. Therefore, the non-rubber hydrocarbon of the natural rubber has a fatty acid in addition to the non-rubber contained in the latex. Some endone extracts act as a dispersing agent during mixing and promote the vulcanization.
Here, it is particularly important to note that the phospholipid is insoluble in acetone. Therefore, it does not belong to the endone extract, and its decomposition product has choline. It can promote vulcanization. Among the ash, there are mainly calcium phosphate and magnesium phosphate, and a small amount of metal compounds such as iron, copper, manganese, etc., which promote the aging of the rubber, are limited to contain halos. For example, the US standard glue stipulates that the copper content is less than 0.00082% and the manganese content is less than 0.0010%.
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