2 results about "Chlorohydrins" patented technology

This invention relates to the field of rubber materials technology. It provides a chlorohydrin rubber material with fatigue resistance, low-temperature resistance, and low air permeability, as well as its preparation method. The raw materials of the chlorohydrin rubber material, by weight, include 95-105 parts of chlorohydrin rubber, 33-37 parts of carbon black, 0.29-0.31 parts of sulfur, 0.9-1.1 parts of accelerator CZ, 1.1-1.3 parts of accelerator ETU, 4.8-5.2 parts of acid scavenger, 2.8-3.2 parts of antioxidant, 13-17 parts of plasticizer, 1.3-1.7 parts of dispersant, 1.5-2.5 parts of lubricant, and 2.0-3.0 parts of sodium stearate. The chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer chlorohydrin rubber with a chlorine content of 24-26%. The chlorohydrin rubber material of this invention, without adding homopolymer raw rubber, can simultaneously satisfy the requirements of high fatigue resistance, excellent low-temperature resistance, and low air permeability.

This application provides a method for the continuous preparation of chlorohydrin rubber, belonging to the field of rubber manufacturing. The method involves continuously feeding toluene, monomers, and a catalyst into a pipeline reactor, controlling the reaction temperature for continuous polymerization. After the reaction is complete, a terminator is added to obtain a chlorohydrin rubber reaction solution. This solution is then fed into a first horizontal biaxial kneading devolatilizer for a first vacuum devolatilization process, achieving a solid content of 65-85% to obtain quasi-solid chlorohydrin rubber. The quasi-solid chlorohydrin rubber is then fed into a second horizontal biaxial kneading devolatilizer for a second vacuum devolatilization process. Moisture is added during this process, and the material temperature is controlled to not exceed 100°C in the later stages of devolatilization. After devolatilization, the material is discharged and cut to obtain devolatilized rubber granules, which are then extruded, metered, and packaged to obtain the finished chlorohydrin rubber product. This application achieves precise temperature control and a narrow molecular weight distribution through the synergy of the pipeline reactor and the two-stage devolatilizer, reducing toluene residue and gel content in the product, resulting in stable Mooney viscosity and excellent batch-to-batch consistency.