The hottest synthetic rubber production safety

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Synthetic rubber production safety

synthetic rubber is a high elastic polymer made of low molecular compounds such as butadiene, styrene, acrylonitrile, chloroprene and so on. It can not only replace natural rubber, but also be superior to natural rubber in some special properties

according to the types of monomers participating in the polymerization, synthetic rubber can be divided into homopolymer and copolymer. Homopolymer, such as cis-1,4-polybutadiene rubber, is polymerized from a single monomer butadiene; Its polymer, such as styrene butadiene rubber, is polymerized from butadiene and phenylene diene. According to the finished state of synthetic rubber, it can be divided into: liquid rubber, such as carboxyl terminated or hydroxyl terminated polybutadiene; Solid rubber, most synthetic rubber is mainly used in spring factories, low-voltage electrical appliances factories, power machinery factories, colleges and universities and scientific research institutions. Rubber is block rubber; Latex and powdered rubber. According to whether the raw rubber is filled with other non rubber components. It can also be divided into oil filled masterbatch, carbon black filled masterbatch and wood filled masterbatch. According to its use characteristics, it can be divided into general-purpose rubber and special rubber. General synthetic rubber mainly includes styrene butadiene rubber, CIS butadiene rubber, isoprene rubber, butyl rubber and neoprene, which are used to manufacture tires for automobiles, aircraft and other general rubber industrial products. Special synthetic rubber mainly includes nitrile rubber, silicone rubber, fluororubber, polysulfide rubber, etc. it is used to manufacture porous products on rubber plate samples used under special conditions (such as high temperature, low temperature, some solvents and acid-base media)

the production of synthetic rubber can be divided into two steps: the production of monomers from basic raw materials, and then the polymerization of monomers into rubber. As shown in Figure 1

Figure 1 Schematic diagram of synthetic rubber production

synthetic rubber is produced from monomers, usually using two methods: lotion polymerization and solution polymerization. The difference between them is that the polymerization reaction medium is different, and water is used as the medium for lotion polymerization; Solution polymerization uses organic solvents (such as gasoline) as the medium. Although the two processes are different, according to their common law, the synthetic rubber production process can be divided into three parts: monomer synthesis and refining, monomer polymerization and rubber post-treatment. The schematic diagram of synthetic rubber process is shown in Figure 2

common varieties of synthetic rubber products and brief production process introduction:

styrene butadiene rubber is abbreviated as SBR. A synthetic rubber made by copolymerization of butadiene and styrene. According to the production method, it can be divided into lotion polymerized styrene butadiene rubber and solution polymerized styrene butadiene rubber. Lotion polymerized styrene butadiene rubber is the general-purpose rubber with the largest output. As for the index, it can be used to manufacture tires and a variety of industrial rubber products. Taking the preparation of styrene butadiene rubber by water lotion polymerization as an example, the main process is to prepare various additives with softened water, and then mix butadiene and styrene monomers with them; After cooling to 5 ~ 7 ℃, it enters several series reactors together with initiator and activator. The reaction temperature is 4 ~ 6 ℃, the operating pressure is 0.19 ~ 0.49mpa, and the reaction of each kettle is controlled by the terminator. After the unreacted butadiene and styrene are removed from the latex terminated in the final kettle, it is mixed with antioxidant and coagulant for coagulation, and then it is compressed and packaged into styrene butadiene rubber products after water washing, extrusion dehydration, drying and other processes. Its production process box process export, domestic demand, investment three carriages lie together, as shown in Figure 3

Figure 2 Schematic diagram of synthetic rubber production process

Figure 3 block flow diagram of styrene butadiene rubber production process

Figure 4 block flow diagram of CIS polybutadiene rubber production process

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