Shandong Landun Petroleum Resin Co., Ltd.
Add：Guyun Industrial Park, Liaocheng City, Shandong Province
Although petroleum resins are divided into four categories, the manufacturing methods are roughly the same. Except for some DCPD resins that are produced by thermal polymerization, the rest are produced by cationic polymerization. Commonly used catalysts are Friedel-Crafts acids such as BF3 and AlCl3. Cationic polymerization is characterized by fast reaction rate and complicated chain transfer. The catalyst is easy to terminate the reaction due to impurities in the raw material or molecular structure. Therefore, it can be polymerized into a polymer with a molecular weight of 500 to 2,000, which is strengthened. Sticky effect.
There are several important steps in the process of petroleum resin—selection and pretreatment of raw material oil, polymerization of the treated raw materials, neutralization and separation of resin. Among them, pretreatment is especially indispensable, to remove the undesirable substances beforehand. Choose feeds of different composition to adjust the properties of petroleum resin; polymerization reaction is to use AlCl3, BF3 and some accelerators, such as HCl, t-BuCl, H2O or phenol, or heating method according to the different raw materials. The main reaction parameters in the process are the total or relative concentration of the feed, the type of catalyst and its concentration, and the temperature. The above items must be carefully controlled in order to have a good yield, molecular weight and molecular weight distribution.
The polymerization method can be divided into batch type, continuous type, and multi-stage continuous type. Among them, the molecular weight analysis of batch reaction is wider, and the multi-stage continuous type has higher yield and narrow molecular weight distribution. The preparation of raw materials is a very important part of the petroleum resin manufacturing process. Through the preparation of feed oils of different fractions, the molecular structure and appearance properties of the finished product can be adjusted. In addition, in order to adjust the polarity or acid value of the finished petroleum resin, it is also possible to add chemical compositions such as maleic anhydride (MA), phenol and rosin to the raw materials, or use the grafting method to graft the petroleum resin with acid radicals. .