The C9 petroleum resin is a thermoplastic resin obtained by polymerizing a C9 fraction as a by-product of a cracking ethylene apparatus, polymerizing it in the presence of a catalyst, or copolymerizing it with an aldehyde, an aromatic hydrocarbon, and a terpene compound. It has a molecular mass of generally less than 2,000 and a softening point of 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 analysis of technological advances, the development of petroleum resin has also entered the era of technological competition. On the basis of fully considering economic, technical and environmental factors, foreign manufacturers focus on improving the performance of products and broadening the application range of products. The modification of C9 petroleum resin mainly develops in two directions: the special material or the modified material and the C9 fraction are selected for copolymerization, that is, chemical modification; after the resin is polymerized, it is hydrogenated, that is, hydrogenated.
By introducing a polar group into the C9 petroleum resin, the compatibility and dispersibility with the polar compound can be improved, and the product can be used as a water quality stabilizer, a thickener, and the like. For example, the resin is modified with maleic anhydride to prepare a water-soluble resin: the phenolic substance is easily incorporated into the vinyl aromatic polymer, and the phenolic substance is used as a solvent for the catalyst to improve the polarity of the resin and promote Mix and disperse with other resins.
Ordinary C9 petroleum resins are generally brown or brown, which greatly limits its application. After the hydrogenation, the original double bond in the resin is destroyed to form a single bond, the resin becomes colorless, has no special odor, and can improve its weather resistance, adhesion, stability and the like, and further broadens its application field. This will be the focus of future developments in the petroleum resin sector.