Neoprene, or CA, is made from 2-chloro-1, 3-butadiene monomer by emulsion polymerization and can be modified with sulfur and 2, 3-dichloro-1, 3-butadiene. Neoprene rubber has high tensile strength, heat resistance, light resistance, aging resistance and oil resistance than natural rubber and butyl rubber. It has strong fire resistance and excellent flame resistance, high chemical stability and good water resistance. However, the current neoprene rubber also generally has poor electrical insulation performance, cold resistance, raw rubber storage instability and other defects.
The nature of the
The appearance of neoprene rubber is milky white, beige or light brown flake or block, density 1.23~1.25g/㎤, vitrification temperature -40℃~-50℃, crushing point -35℃, softening point about 80℃, 230℃~260℃ decomposition. Soluble in chloroform, benzene and other organic solvents, in vegetable oil and mineral oil swelling but not dissolved.
It has good physical and mechanical properties, oil resistance, heat resistance, fire resistance, sunlight resistance, ozone resistance, acid and alkali erosion, chemical reagent resistance, but the disadvantage is cold resistance and storage stability is poor.
Production methods
The invention relates to a production method of neoprene rubber, which is characterized in the following steps:
1) preparation: the refined clobutadiene is dried and cooled, and then measured into the oil phase preparation kettle. According to the formula, sulfur is added, and rosin is added after dissolution, and oil phase is prepared, and water phase is prepared with softening water, sodium hydroxide, dispersant, and initiator solution and termination agent solution are prepared at the same time;
2) polymerization: the oil phase and water phase are mixed and emulsified in the emulsification dad, then sent to the polymerization dad, adding the initiator solution, and polymerization at 35-45 °C for 2-2.5h;
3) termination and chain breaking: when the relative density of latex reaches 1.068, the polymerization reaction is terminated to the main terminator of latex, and then the latex is put into the chain breaking groove, and the chain is interrupted in the alkaline medium, and the end point is controlled by plastic;
4) Condensation and drying: the latex after chain breaking is sent to the condensation tank and acts with the coagulant composed of sodium chloride and calcium chloride to precipitate the rubber in small particles, and then it is washed, squeezed, dehydrated, dried, powdered and cut and packaged into finished products.
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