Modification and application of C9 petroleum resin

C9 petroleum resin is the main raw material of the by-product C9 fraction of the cracking ethylene plant, polymerized in the presence of a catalyst, or copolymerized with aldehydes, aromatics, and terpene compounds to prepare thermoplastic resins. Its molecular mass is generally less than 2000, and its softening point is less than 150°C. It is a thermoplastic viscous liquid or solid. Because of its low softening point and relatively small molecular weight, it is generally not used as a material alone.

With the development of modern science and technology, especially the advancement of analysis technology, the development of petroleum resin has also entered an era of technological competition. Foreign manufacturers focus on improving product performance and broadening the application range of their products on the basis of full consideration of economic, technological, environmental and other factors. The modification of C9 petroleum resin mainly develops in two directions: selecting a special material or modified product and C9 fraction for copolymerization, that is, chemical modification; and then hydrogenating the resin after polymerization, that is, hydrogenation modification.

Chemical modification

By introducing polar groups into C9 petroleum resin, the compatibility and dispersibility with polar compounds can be improved, and the product can be used as a water stabilizer, thickener, etc. For example, the resin is modified with maleic anhydride to prepare water-soluble resins: phenols are easily incorporated into vinyl aromatic polymers, and phenols are used as solvents for catalysts to improve the polarity of the resin and promote Mix and disperse with other resins.

Hydrogenation modification

Ordinary C9 petroleum resin is generally brown or brown, which limits its application to a large extent. After hydrogenation, the original double bonds in the resin are destroyed and single bonds are formed. The resin becomes colorless and has no special odor. It can also improve its weather resistance, adhesion, stability and other properties, which further broadens its application fields. This will be the focus of future development in the field of petroleum resins.