1. Reduce the melt viscosity of the product, PVC plasticizers in reducing the melt viscosity of the product is mainly reflected in the record and packaging materials, the key role of the butanedioic acid vinegar compounds, which **** polymerize with each other in order to obtain the impact resistance and cold-resistant polyvinyl chloride **** polymer. Lowering the melting point, softening temperature or flow temperature of the product reduces the melt viscosity of the product and increases fluidity, thus improving processing.
2. Increase the flexibility of the polymer, pvc plasticizer is different from general solvents, volatilization during processing, and pvc plasticizer can stay in the polymer for a long time, do not react with the resin, and the resin to form a solid. Adding pvc plasticizer can increase the softness, flexibility, cold resistance and elongation of the product. Because of this function of pvc plasticizer, it is also often used in medical equipment.
3. Reduce the glass transition temperature, the key to plasticizing plasticizers is to weaken the force between the polymer. When pvc plasticizer and resin melt, pvc plasticizer small molecules inserted into the polymer molecular chain, weaken the gravitational force between the polymer molecular chain, increase the distance between them, can be very good to reduce their glass transition temperature.
4. Reduce polymer surface hardness. The effect of PVC plasticizers on reducing the surface hardness of polymers is due to the nature of the groups in the polymer chain. The polar groups of PVC plasticizers interact with the polar groups of the polymer, weakening the interaction between the polymers to achieve the purpose of the plasticizer.