The Methods To Improve The Veka Softening Point Of PVC
Brief introduction of Vicat softening point
Vicat softening temperature (VST) is an engineering plastics, GE Plastics such as sample polymer in the liquid heat transfer medium in a certain load, constant temperature, 1mm2 indenting into 1mm depth temperature. There are professional instruments and testing standards.
The softening point of Vicat is suitable for controlling polymer quality and evaluating the thermal performance of new varieties. It is a method to evaluate the trend of high temperature deformation of thermoplastic, but it doesn't represent the service temperature of materials.
A method to improve the Vicat softening point
1, on the resin side, CPVC can be added by the chlorination of polyvinyl chloride (PVC) resin. It is a new type of engineering plastic. The product is a white or yellowish, odorless, odorless, non-toxic loose particle or powder. After the PVC resin was chlorinated, the irregularity of molecular bonds increased and the polarity increased. The solubility of the resin increased and the chemical stability increased. Thus the heat resistance, acid, alkali, salt and oxidant of the material increased. The mechanical properties of the numerical hot deformation temperature were increased. The chlorine content increased from 56.7% to 63-69%, and the softening temperature of Vicat increased from 72-82 PVC to 90-125 CPVC. The highest service temperature was up to 110 C, and the long-term usage temperature was 95 C. The shortcoming is that the processing is difficult, the formula should be adjusted accordingly. As for how much to add, it needs to be grasped by yourself. Of course, it is also important to choose the right PVC model