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Catalyst is one of the main factors affecting the performance of C5 petroleum resin

author£ºadmin Date£º2017/1/12 17:17:19

C5 monomer composition is relatively complex, including cyclodienes (such as cyclopentadiene, dicyclopentadiene), diene (isoprene, cis or trans-metopentadiene), monoene (isobutylene, 1 Butene, cis or trans 2-butene, 2-methyl-2-butene, 3-methyl-1-butene, 2-methyl-1-butene, trans-2-pentene), cyclic mono-ene (cyclopentene) and the like. No matter what kind of polymerization method and initiator, its composition varies with the factors such as cracking raw material, cracking depth, cracker and other factors, different sampling time, its composition is also very different, resulting in petroleum resin quality control has a considerable difficulty. How to effectively control the softening point and decrease the hue of petroleum resin products during polymerization and post-treatment is the key to stabilize and improve the performance of C5 petroleum resin.

Pure anhydrous AlCl3, the catalytic activity is too high, the cationic polymerization reaction is exothermic reaction, if the heat can not be released in time, so that the reaction temperature is too high, DCPD depolymerization is greater than dimerization resulting CPD, not only increase the reaction But also the reaction rate is increased, the reaction is difficult to control, resulting in oil resin products hue deepened, affecting product quality; at the same time will generate a large number of gel, so that the resin yield And the softening point is lowered and the hue is also deep.

AlCl3 is cheap, and the post-treatment is easier than other catalysts. Therefore, AlCl3-based modification system has received extensive attention, such as benzene, alkylbenzene, nitro compounds, halogenated alkanes (aromatics), ethers, pyridine, esters Ester, methyl phthalate), dimethylformamide (DMF), dimethyl sulfoxide (DMSO) and so on to form a catalytic system with stable catalytic performance. However, the use of solid AlCl3 as a catalyst, in the actual production of the following problems: polymerization time is too long, about 10 ~ 12h; easily lead to the phenomenon of polymerization and overflow reactor; catalyst consumption increased; raw water content with batch adjustment; Low yield, and time-consuming, easy to produce flocculent precipitation Al (OH)3. The choice of new catalyst is to improve the yield of petroleum resin, shorten the reaction time and improve the quality of the important means.

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