Petroleum Resin C9 manufacturers told us that So far, in addition to dicyclopentadiene, the C9 fraction, the C5 fraction and other fractions rich in unsaturated olefins have been subjected to a catalytic process for the preparation of petroleum resins, that is, a cation of 1 to 2% of the fraction is added. The catalyst, such as boron trifluoride, aluminum trichloride, sulfuric acid, etc., is polymerized at 0 to 30 ° C for 7 to 10 hours. Catalytic method In the polymerization reaction, it is necessary to control the rate of addition of the catalyst to prevent the formation of the colloid or the reaction rate is small and the yield is low; after the completion of the polymerization, a large amount of basic substances such as ammonia water, calcium hydroxide, and hydroxide are also required. Potassium, sodium hydroxide, etc. act as a retarder to neutralize the catalyst; thereafter, the material is washed twice with more water than the raw material to remove the inorganic material: after washing, the low-fraction component can be distilled off at 240-260 ° C to obtain petroleum. Resin.
C9 Resin suppliers said that the catalytic synthesis of petroleum resins has the following drawbacks:
1. The yield of the petroleum resin product synthesized by the catalytic method is low, and the polymerization conversion ratio of the unsaturated olefin is not more than 50%, generally 30-40%.
2. A large amount of waste residue and waste water are generated during the production process, which is difficult to handle and causes great environmental pollution.
3, catalytic synthesis of petroleum resin production process, automation is difficult, the production process is random, product quality is not easy to control, the synthetic petroleum resin molecular weight distribution range.
4. The catalyst needs to be added during the synthesis process, and some residual catalysts make the product high in ash, easy to deteriorate in storage, and poor in heating stability.
5. The catalyst, the stopping agent and a large amount of water are needed in the synthesis process, and the production cost is high.
PETROLEUM RESIN factory said that our aim is to provide a new method for the synthesis of petroleum-polymerized resin. Compared with the catalytic synthesis method, the yield of petroleum resin is increased, the product quality is improved, and the pollution problem is solved. .
C9 Hydrocarbon Petroleum Resin suppliers told us that the raw materials used in this invention are petroleum cracking ethylene by-products - C9 fraction, C5 fraction, dicyclopentadiene fraction, styrene tar and other fractions rich in unsaturated olefins. These raw materials are rich in unsaturated olefins such as styrene, o-, m-methyl styrene, hydrazine, dicyclopentadiene, cyclopentadiene, pentene, isoprene and piperylene. These olefins may undergo an addition reaction or a radical polymerization reaction at a certain temperature. The present invention utilizes this principle to carry out polymerization of one or a mixture of the above materials in a temperature range of 170 to 280 ° C and a pressure of 0.3 to 3.5 MPa, and to be directly distilled off after the polymerization reaction is completed. The unreacted unsaturated monomer and solvent were distilled under reduced pressure to prepare an C9 petroleum resin, a C5 petroleum resin, a dicyclopentadiene petroleum resin, a coumarone petroleum resin, and various copolymerized petroleum resins.
In the thermal polymerization synthesis reaction system, an organic initiator such as benzoyl peroxide and methylbenzenesulfonic acid may be added as a catalyst, and the initiator only serves to accelerate the polymerization. After the polymerization is completed, the organic initiator does not need to be separated and removed from the reaction system. It is also possible to add no catalyst to the reaction system.
The reaction pressure is generated by the reaction material at a certain temperature, and nitrogen gas can also be injected into the reaction vessel. A certain pressure contributes to the rapid completion of the polymerization reaction.
Synthetic petroleum resin has certain requirements on the components in each fraction. Generally, the C9 fraction refers to any fraction in the boiling range of 140 to 300 ° C, and the C5 fraction refers to any fraction in the boiling range of 20 to 80 ° C. The pentadiene fraction means any fraction in the range of 30 to 100% containing dicyclopentadiene, and the styrene tar is a slag liquid after distillation to remove styrene, and optionally contains styrene, methyl styrene, and hydrazine. Raw materials for dicyclopentadiene, cyclopentadiene, piperylene, isoprene, pentene and other olefins can also be used.
At the same time, the low-fraction distilled from the petroleum resin can be used as a raw material to produce petroleum resin, and the yield can reach 40-50%.
Depending on the choice of raw materials and the ratio of the reaction conditions and reaction conditions, petroleum resin products of various properties can be produced for use in different manufacturing industries such as rubber, ink, paint, paper and adhesive.
C9 Hydrocarbon Petroleum Resin manufacturers said that the synthesis method of the thermal polymerization petroleum resin is greatly improved compared with the catalytic synthesis of petroleum resin. The yield of petroleum resin by the conventional catalytic method generally does not exceed 50%, and the yield of the thermal polymerization method can reach 60 to 80%. Compared with the traditional catalytic method, the production process of the thermal polymerization method is simple and the production cost is low. The traditional catalytic process for the synthesis of petroleum resin requires the addition of a catalyst, a stop agent, and the use of a large amount of water to wash the material, which is not only complicated in process, but also consumes large raw materials and has high production cost. The thermal polymerization method can not add or add a small amount of organic initiator, and the initiator does not need to be removed, it is not necessary to add a stopping agent, and the material is not washed, the process is simple, and the production cost is greatly reduced.
C5 Petroleum Resin factory mentioned that The quality of petroleum resin products synthesized by thermal polymerization is also greatly improved. The petroleum resin produced by the catalytic method has a large molecular weight distribution range and is inferior in compatibility with other resins, and has high ash content, poor hue and storage stability due to residual catalyst or inorganic salts. The petroleum resin synthesized by the heat polymerization method effectively solves the above problems.
The thermal polymerization of petroleum resin also solves the serious pollution problem caused by catalytic production of petroleum resin. The discharge of a large amount of waste residue and waste water generated in the catalytic production process severely restricts the development of the petroleum resin industry. However, the present invention uses the thermal polymerization method to synthesize petroleum resin, and there is no water washing, filtration, etc. in the production process, and no waste residue or waste water is generated, which is effective. The problem of environmental pollution has been solved.