Preparation method of high content insoluble sulfur

Abstract

The invention discloses a preparation method of high content insoluble sulfur (IS). In the preparation technology, the procedures of extraction, washing, suction filtration and drying are continuously finished in the same drier, wherein the extraction is carried out under the protection of adding CS2 and N2; after extraction, mother solution is pumped off; CS2 is added twice for washing and then suction filtration; then, jacket hot water is used for heating and drying; the material is obtained after water cooling; the extraction and drying are carried out under rotation; suction filtration and drying are carried out under the vacuum pressure of 0.01 to 0.03MPa; a cavity of the drier is closed; and the drier only has one dynamic seal. By adopting the technological specification of the method, the materials is not transferred in the production without leakage; safety environmental requirements are satisfied; moreover, washing and suction filtration are carried out twice; vacuum drying is carried out; each technological condition and technological parameter are selected reasonably and mutually matched; remaining insoluble sulfur is reduced, thereby preventing IS from reducing into the insoluble sulfur; accordingly, the content of IS is enhanced. Indicated by a test, in IS powder prepared by the invention, the content of IS is not less than 98%.

Description

technical field [0001] The invention relates to a method for preparing insoluble sulfur by a high-temperature gas phase method, especially a method for preparing insoluble sulfur with high content. Background technique [0002] The chemical name of insoluble sulfur is sulfur homopolymer, or IS for short. It is a metastable polymer, especially when heated, it will gradually return to ordinary sulfur (ie soluble sulfur). IS is an excellent rubber vulcanizing agent, currently mainly used as a special vulcanizing agent for radial tires, because IS is insoluble in CS 2 And rubber, so the rubber vulcanized with it has the best non-blooming property, and can effectively prevent the scorching of the rubber compound and promote the adhesion of the rubber to the mesh in the tire, while the soluble sulfur is used as a vulcanizing agent, which will make The glue sprays frost, so the soluble sulfur content in IS products is required to be ≤2.5%. In the existing domestic production pro...

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Problems solved by technology

In the existing domestic production process, each process is carried out independently, and it cannot be continuous. Safety accidents are prone to occur during the material transfer process, and it is difficult to meet the specified process conditions. In the existing process, the selection of various process parameters is unreasonable. If it is not strict, effective cooperation cannot be achieved, especially in the drying process, the sealing and vacuum requirements cannot be met, and the drying time is long, resulting in low IS content