English name: thiolkol; polysulfide rubber [—CH 2 —CH 2 —Sx—] ​​n A synthetic rubber obtained by polycondensation of a dihalogenated alkane with an alkali metal or alkaline earth metal polysulfide. It has excellent oil and solvent resistance, but its strength is not high, its aging resistance is not good, its processing performance is not good, and it has odor. Used in combination with nitrile rubber. Industrial products are solid polysulfide rubber, liquid polysulfide rubber and polysulfide latex. In 1929, the US polysulfide rubber company first began industrial production of polysulfide rubber. In 1955, Jinxi Chemical conducted an intermediate test, and the output could meet domestic needs. The Soviet Union, the Federal Republic of Germany, France, Italy, Belgium, Japan, etc. all had polysulfide rubber production. Currently only Germany, Japan, Russia and China have production. Description: A synthetic rubber, a special rubber. A general term for special synthetic rubbers containing sulfur atoms. It is a polyhalide derivative of an aliphatic hydrocarbon, an ether or the like, or a mixture thereof, and a polycondensate of an alkali metal or an alkaline earth metal polysulfide. Each repeat unit has a linear chain of two to four sulfur atoms. Depending on the materials used and their proportions, various tough, lumpy, viscous or viscous liquid materials can be obtained. Yellow-green, light brown or dark brown. The density is 1.28~1.41. The glass transition temperature is -42~-54 °C. Insoluble in oils and various solvents, slightly swelled in carbon disulfide. It does not change due to the effects of oxygen, ozone and sunlight. Low gas permeability. Tensile strength and elongation are low, and carbon black reinforcement is required. Because of its strong oil resistance, it is necessary to use a promoter such as anthraquinone, thiazole or thiuram as a softener, and manganese dioxide, lead dioxide and zinc peroxide as vulcanizing agents. Can be used with other rubbers. The main disadvantages are cold resistance, heat resistance, poor adhesion and odor. Mainly used in the manufacture of various oil resistant rubber products. It can be dihalogenated derivatives (mainly dichloroethyl formal, dichloroethane, dichloroethyl ether, etc.) and alkali metal and alkaline earth metal polysulfides (usually sodium polysulfide, etc.) in an inert medium (such as water, An aqueous solution of an alcohol or acetone or the like is prepared by a step of stirring and polycondensation at a temperature of about 60 ° C in the presence of a dispersing agent (alkaline earth metal oxide, hydroxide, and carbonate such as magnesium hydroxide).
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