The production process of cis-butadiene rubber includes preparation and metering of catalyst, terminator and antioxidant, butadiene polymerization, glue coagulation and dehydration and drying of rubber. Almost all of its polymerization adopts continuous solution polymerization process. Most of the polymerization devices use 3 to 5 kettles in series, and the single kettle volume is 12 to 50 m. Rubber floor mat anti-slip factory shares with you. The solvent used and the product obtained vary with the catalyst. ① Butyl lithium is used as a catalyst to produce butadiene rubber, and cyclohexane (or hexane) is mostly used as a solvent. This polymerization system has high catalytic activity, simple process, and easy control of reaction; but the resulting cis-butadiene rubber has low cis 1,4 content, narrow molecular weight distribution, and is not easy to process. The physical properties of vulcanized butadiene rubber are generally poor. Only mixed with polystyrene resin as modified resin. ②When producing cis-butadiene rubber with titanium or cobalt catalyst system, benzene or toluene is generally used as the solvent to produce cis-butadiene rubber with a high content of cis 1,4, and the physical properties of vulcanized rubber are similar. The molecular weight distribution is narrow, the cold flow tendency is large, and the processing performance is not as good as cobalt and nickel cis-butadiene rubber. ③Using nickel-based catalysts to produce cis-butadiene rubber, aromatic hydrocarbons (such as benzene or toluene) and aliphatic hydrocarbons (such as cyclohexane, hexane, heptane or hydrofining gasoline) can be used as polymerization solvents and can obtain high molecular weight and high Cis-cis-butadiene rubber, the technology of producing cis-butadiene rubber by using nickel naphthenate-triisobutylaluminum-boron trifluoride etherate complex as the catalyst and the residual oil as the solvent (main technical method of producing rubber in China) China began research in 1959 and built a 10,000-ton production plant in 1971 and put it into production. ④ There are still three new types of catalysts: rare earth catalysts (such as rare earth naphthenate-monochlorodiethylaluminum-triisobutylaluminum), π-allyl nickel chloride catalysts [such as (π-C3H5NiCl) 2-four Chloroquinone] and halogenated π-allyl uranium catalyst [such as (π-C3H5) 3UCl-AlRCl2, where R is ethyl] can produce high cis (96% ~ 99%) butadiene rubber, Moreover, the activity and physical properties of the obtained vulcanizates are also good, but due to the late development, they have not reached the level of industrial production by the mid-1980s.
Butadiene rubber can be vulcanized by the traditional sulfur vulcanization process. Its processing performance is similar to that of general rubber, except that the mixing speed is slow and the roller is slightly removed during mixing.
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