Why Not Use Butadiene for Synthetic Butyl Rubber?

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Why Not Use Butadiene for Synthetic Butyl Rubber?

Jun. 30, 2021

As a Bromobutyl Rubber Stopper, let me share with you.

Because the use of isoprene (2-methyl du1, 3-J1 ene) as a monomer has completed the industrialization. Butadiene can be synthesized into butyl rubber, and the precursor of butyl rubber was obtained by copolymerizing isobutylene and butadiene with aluminum trichloride in ethyl chloride solvent.

Bromobutyl Rubber Stopper

Bromobutyl Rubber Stopper

At present, there are many kinds of butyl rubber processes, and it is often used to prepare a 25% solution of refined isobutylene (97%-98%) and isoamylene (2%-3%) in diluent methyl chloride, and Quench to -100°C (here is a methyl chloride solution, not an aqueous solution; elementary school students can easily make mistakes); At the same time, the catalyst chloroform is dissolved in methyl chloride and quenched to -100°C. Two liquid streams are continuously injected into the polymerization vessel and the polymerization vessel is kept at 100°C to obtain a slurry of butyl rubber fine ions. The cooling method is to continuously evaporate liquid ethylene to take away the reaction heat in the polymerization vessel. The effluent slurry is flashed with hot water to remove unreacted monomers and diluents, and antioxidants and dispersants are added to prevent the decomposition of J-based rubber and the phenomenon of agglomeration and mutual adhesion. Finally, the residual methyl chloride is taken away by negative pressure, and then The water is separated and pressed to obtain the finished butyl rubber.

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