Insoluble Sulfur, molecular formula: Su, is a non-toxic, flammable yellow powder, named because it is insoluble in carbon disulfide. It is made by thermal polymerization of ordinary sulfur. The number of sulfur atoms in the molecular chain is as high as 108 or more. It has the viscoelasticity and molecular weight distribution of a polymer. Therefore, it is also called elastic sulfur or polymerized sulfur. It is an inorganic polymer chemical raw material.
advantage
1) Insoluble sulfur exists in the rubber in a dispersed state, so that the rubber does not bloom, has good viscosity, and can ensure the appearance quality of light-colored products.
2) Insoluble sulfur is evenly dispersed in the rubber compound, effectively resisting the accumulation of sulfur, and reducing the tendency of scorching during storage of the rubber compound.
3) Insoluble sulfur prevents the rubber from blooming during the storage period and keeps the performance of the rubber compound uniform. Prevent the contamination of products and molds, and remove the coating process added to overcome blooming, providing conditions for production linkage.
4) Insoluble sulfur prevents rubber from migrating in adjacent rubber layers. Especially in the rubber compound of butadiene rubber and butyl rubber, the migration speed of ordinary sulfur is very high, which can be avoided after adding insoluble sulfur.
5) Insoluble sulfur shortens the curing time. When it reaches the vulcanization temperature, it has an "activation stage", that is, chain depolymerization, which speeds up the vulcanization speed, reduces the amount of sulfur, and helps improve the aging performance of the product.
use
Insoluble sulfur, it is mainly used as a high-grade accelerator and vulcanizing agent in the rubber industry, and is widely used in the production of tires and other rubber composite products, such as tire carcass rubber, cushion rubber, white sidewall rubber and rollover Adhesion of rubber and frame materials such as tires, hoses, tapes, etc.
Among the rubber compounds, it can also be used in rubber products such as cables, rubber rollers, oil seals, rubber shoes, etc., and also in light-colored rubber products with a large amount of sulfur. Because the insoluble sulfur can make the meridian, steel wire and rubber stick more firmly, effectively prevent the rubber from frosting, and improve the heat resistance and wear resistance of the tire. Therefore, insoluble sulfur is an essential raw material in tire production.