Application research and development of silica in PVC pipe production
Rigid PVC pipe is a high-strength material. It is often manifested as brittle form failure. Under the premise of optimizing product performance, improving product enthusiasm, and developing new application fields, producing a high-strength and high-toughness product has always been an important research topic for the majority of scientific and technological personnel. The traditional PVC modification is mainly through the blending of PVC materials and elastomers (ABS, TPu, EVA, CPE, NBR). Although the toughening effect is very significant, the rigidity and tensile strength of the material are sacrificed. Zhang Weihu's research on CPE modified rigid PVC found that in the PVC/CPE blend system, with the continuous increase of the amount of CPE, the tensile strength of the blend system decreased. The impact strength is improved. Domestic pipeline researchers have also carried out a lot of research to achieve toughening and strengthening of PVC pipes by adding elastomers or elastomers and rigid particle composites, as a simple and feasible way to obtain low-cost, high-performance engineering materials modification. The method of strengthening and toughening polymers by rigid inorganic particles has attracted people's attention. Compared with ordinary inorganic particles, inorganic ultrafine particles have a greater possibility of physical or chemical bonding with polymers, which enhances the interface between particles and polymer matrix. combination. Improve the ability of the polymer to bear the load, which can strengthen the toughened polymer. The emergence of nanoparticles has had a major impact on the research and development of high-performance materials, alloys, and more. There are more and more studies on nanoparticle toughened PVC materials.

Silica is a green and environmentally friendly additive with superior performance. It is widely used in the reinforcement and modification of natural rubber and synthetic rubber, and can be used in color or light-colored products instead of carbon black. Based on the outstanding performance of silica in rubber reinforcement. Domestic researchers began to study the application of silica in plastics. The study found that the addition of fumed silica to the polystyrene film improved the transparency, strength, toughness and anti-aging properties of the film: the hardness, smoothness and anti-aging properties of the plastic-steel profiles produced by adding fumed silica to ordinary polyvinyl chloride were greatly improved. Improvement: The use of fumed silica to modify ordinary polypropylene. The main technical indicators have reached or exceeded the performance indicators of nylon 6, and the use of polypropylene railway accessories instead of nylon 6 has been realized, and the cost has been greatly reduced. Economic and social benefits are significant.

There are few domestic research reports on the application of white carbon black in the modification and processing of PVC pipes. This article aims to discuss the feasibility through analysis and demonstration. Modified development.