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Manufacture of C5 petroleum resins

author£ºadmin Date£º2016/12/14 17:41:08

The basic production processes of C5 petroleum resins are similar, including the steps of pretreatment of raw materials, polymerization, post-treatment of products, separation of polymer resins, solvent recovery and waste treatment. Aliphatic petroleum resins and aliphatic-aromatic copolyester resins are catalytically polymerized and alicyclic petroleum resins are thermally polymerized.

Polymerization chemistry of C5 petroleum resins olefins:

C5 petroleum resin (aliphatic petroleum resin) is the C5 fractions in the role of the catalyst generated by cationic polymerization. The mechanism of cationic polymerization of C5 olefins catalyzed by Lewis acid can be divided into chain initiation, chain growth and chain termination.

(1) Chain initiation: Lewis acid and the donor (such as water, alcohols, etc.) or to the cation (such as chlorotetane) compounds react, the resulting cation and monomer addition to the formation of carbon cations, This process is chain initiation, which is the beginning of the polymerization reaction.

(2) Chain growth: in the chain initiation stage of carbon cations produced by the continuous addition of monomer molecules continue to grow, this process is the chain growth.

(3) Chain termination: There are many reactions can lead to cationic polymerization of the termination of the growth chain, this process is the chain termination. However, most reactions that terminate chain growth do not terminate the kinetic chain, but instead initiate a chain initiation of the new C5 olefins in the process, which is chain transfer.

The C5 fraction is a mixture of chain dienes, cyclic diolefins, monoolefins and saturated hydrocarbons, and the composition is very complex. In the course of the reaction, the main reaction is to participate in the reaction of high activity of pentadiene, isoprene, cyclopentadiene and dicyclopentadiene. Some mono-olefins can also participate in polymerization reaction, such as cyclopentene, 2-methyl-1-butene and so on, but the polymerization activity of monoolefins is very low, so C5 petroleum resin is a product of multi-copolymerization. The higher content and higher reactivity of the diene form the basic skeleton of C5 petroleum resin molecular chain, while the lower content of some of the lower reactivity of mono-olefin is embedded in the resin molecular chain.