purposes: as a plasticizer, non-toxic. It is mainly used as a plasticizer for polyvinyl chloride, but the product has good flexibility. It is an excellent plasticizer for nitrocellulose with strong gelation ability. It can also be used as a plasticizer for polyvinyl acetate, alkyd resin, YIJI cellulose, natural synthetic rubber, and plexiglass.
It is usually some high-boiling, hard-to-volatile viscous liquid or low-melting solid, and generally does not chemically react with plastics.
The plasticizer must first have good compatibility with the resin, the better the compatibility, the better the plasticizing effect. Adding plasticizers lowers the glass transition temperature of plastics, making hard and rigid plastics soft and pliable. Generally, plasticizers are also required to be colorless, non-toxic, odorless, light-resistant, heat-resistant, cold-resistant, low in volatility and migration, non-flammable, good in chemical stability, cheap and easy to obtain. In fact, it is impossible for a plasticizer to meet all the above requirements.
Plasticizers are divided into main plasticizers according to their functions, that is, solvent plasticizers; auxiliary plasticizers, that is, non-solvent plasticizers; catalyst plasticizers; according to their chemical structure, they are divided into phthalates. , fatty acid esters, phosphate esters, polyesters, epoxy esters, chlorine-containing compounds, etc. Commonly used plasticizers are dibutyl phthalate (DBP), dioctyl phthalate (DOP), epoxy soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate, Chlorinated paraffin, etc. PVC is the main end user of these plasticizers. The main application areas of PVC with plasticizers are wires, cables, floor and wall veneers, building materials, automobiles and packaging materials.
