Performance Of PVC Hose
Pure poly (vinyl chloride) (PVC) resin belongs to a class of strong polar polymers, whose intermolecular force is large, which leads to high softening temperature and high melting temperature of PVC. It is generally required to be processed at 160~210 C. In addition, the substitution of chlorine in the PVC molecule easily leads to the reaction of dehydrochlorination of PVC resin, resulting in the degradation reaction of PVC, so PVC is unstable to the thermal pole. The increase of the temperature will greatly promote the HCL reaction of PVC, and the pure PVC begins to degrade the HCL at 120 degrees, leading to the PVC degradation.
In view of the defects of the two aspects mentioned above, PVC needs to be added to the processing in order to produce a variety of products such as soft, hard, transparent, good electrical insulation and foaming that meet the needs of the people.
In selecting the varieties and dosage of additives, we must consider all aspects of the factors, such as physical and chemical properties, flow properties and molding properties, and finally establish an ideal formula. In addition, according to different uses and processing methods, we also need to choose the type of resin.