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professional company profile designare generally plastics with no or less plasticizer, which inevitably results in poor fluidity of rigid PVC plastics. In the molding process, the plastic is required to be in a viscous flow state. In order to make the plastic have a certain degree of fluidity, the molding temperature must be increased. However, there is a certain limit to the increase of molding temperature. If it exceeds the decomposition temperature of PVC plastic, it will not operate normally. Therefore, in the formulation design, we must consider the characteristics that the molding temperature of rigid PVC is close to the decomposition temperature, and try to choose a reasonable formula to make up for this defect.
The components of PVC plastic formula are related to each other and can not be selected in isolation. When choosing auxiliaries, all factors should be taken into account. The physical property indexes considered are not independent changing factors, and often influence and restrict each other. For example, in order to improve the impact resistance of PVC, the addition of rubber or elastic polymer is effective, but it will cause the decrease of modulus, rigidity and heat resistance. For example, in order to improve the heat resistance of PVC, chlorination can increase the glass transition temperature (Tg) of PVC. However, the melting temperature Tm is also increased accordingly, resulting in a significant deterioration of processability and fluidity.
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