PVC Modification Method

PVC resin is a polar amorphous polymer with a density of 1.38 g/cm3 and a glass transition temperature of 87 ℃. Therefore, it has poor thermal stability and is not easy to process. It cannot be used directly. It can only be used after modification and blending, and adding relevant additives and fillers. The properties and requirements of PVC materials prepared are different due to the different types and contents of additives and fillers. We usually call it PVC formula. Strictly speaking, it is PVC modified formula, and PVC can only be used after modification. This category is often classified as polymer modified materials. The modification of polymer materials mainly focuses on the high performance of general plastics, the transformation from single component materials to multi-component composites (alloys, blends, composites), the functionalization of materials, and the optimization of properties and prices. The main modification methods are chemical modification, filling modification, reinforcement modification, blending modification and nano composite modification. The basic principle of modification is to endow materials with functions or improve certain properties through additives. Therefore, the level of PVC formulation technology determines the level of technology and production capacity of a factory.
PVC generally needs to be modified and granulated first. After the particles are prepared by the screw extruder, the plasticization is more complete and the processing is easier, especially for the products with injection molding technology. Screw extruder is one of the most important equipment for plastic molding processing. It carries out solid conveying, compaction, melting, shearing, mixing and extrusion molding of plastic through external power transmission and external heating element heat transfer. Screw extruder plays an important role in both plasticizing and granulating machinery and molding and processing machinery. Strictly speaking, PVC products with special requirements and PVC modification formula are tailored according to customer requirements. The other is copolymerization and derivation in the PVC production process. Such modified varieties include vinyl chloride copolymer, PVC blend and chlorinated polyvinyl chloride