Although petroleum resins are divided into four types,Petroleum Resin the manufacturing methods are roughly the same. Except for some DCPD resins produced by thermal polymerization,Petroleum Resin the rest are all applied by cationic polymerization. Common catalysts are sometimes added with a little accelerator. The characteristic of cationic polymerization is the reaction rate. Fast,Petroleum Resin the catalyst is easy to terminate the reaction due to factors such as impurities or molecular structure in the raw material, so it can be polymerized into a polymer with a molecular weight of 500 to 2,000,Petroleum Resin which enhances the viscosity increase effect.
There are several important steps in the process of petroleum resin-selection and pre-treatment of raw oil,Petroleum Resin polymerization of processed raw materials, neutralization and separation of resin. Among them,Petroleum Resin pre-treatment is especially indispensable, in order to remove bad materials in advance Select feeds with different compositions to adjust the properties of the petroleum resin;Petroleum Resin or heating to carry out the reaction. The main reaction parameters in the process are the total or relative concentration of the feed,Petroleum Resin the type of catalyst and its concentration, and temperature. The above items must be carefully controlled In order to have a good yield,Petroleum Resin molecular weight and molecular weight distribution.
The polymerization method can be divided into batch type,Petroleum Resin continuous type, and multi-step continuous type. Among them, the molecular weight analysis of the batch reaction is wider,Petroleum Resin and the multi-step continuous type has higher yield and narrower molecular weight distribution. The raw materials are formulated in the petroleum resin process It is a very important part. By adjusting the feed oil of different fractions,Petroleum Resin the molecular structure and appearance properties of the finished product can be adjusted. For example,Petroleum Resin C5 and C9 are copolymerized or some pure monomers are added as a modification, in addition to adjusting the petroleum resin For the polarity or acid value of the finished product,Petroleum Resin chemical compositions such as maleic anhydride (MA), phenol and rosin can also be added to the raw materials,Petroleum Resin or the petroleum resin can be grafted with acid radicals by grafting formula.