Chlorinated polyvinyl chloride tube and preparation process thereof

Abstract

The invention discloses a chlorinated polyvinyl chloride tube and a preparation process thereof. The tube is prepared from chlorinated polyvinyl chloride resin, a stabilizer, a toughening agent, a filler, a lubricant, a light screener and an ultraviolet absorbent serving as raw materials, wherein the toughening agent is one or more of MBS (Methyl methacrylate-Butadiene-Styrene copolymer), anti-impact ACR (Acrylic resin) and CPE (Chlorinated Polyethylene); and the tube is prepared through the following steps of: uniformly mixing all the raw materials in a high-speed mixer, mixing and cooling in a cold mixer, extruding through a double-screw extruder, cooling and forming. Compared with the prior art, the tube has a novel toughening and reinforcing system, i.e., various organic toughening agents are used in coordination with one another, and an organic composite toughening agent is used in coordination with inorganic rigid particles for toughening and reinforcing; and the tube has superior performance and higher anti-impact strength, tensile yield strength, vicat softening temperature and weather resistance, has a wider application range, is safer, is suitable for being buried underground and laid in a concealed way and can also be stored for a long time and used outdoors.

Description

technical field [0001] The invention relates to a chlorinated polyvinyl chloride pipe, in particular to an aging-resistant and impact-resistant chlorinated polyvinyl chloride pipe and a preparation process thereof, belonging to the technical field of polymer materials. Background technique [0002] In recent years, a new plastic material has come out, which is chlorinated polyvinyl chloride CPVC. The United States and Japan have launched this product one after another, and some colleges and universities in my country have carried out research on this material for many years, but both the preparation of CPVC resin and the production of CPVC products are immature. Chlorinated polyvinyl chloride pipes not only inherit the advantages of UPVC pipes, but also greatly improve the heat resistance, chemical corrosion resistance and weather resistance of PVC materials. It is a plastic pipe with excellent comprehensive performance, and its unique characteristics such as flame retardan...

AI Technical Summary

Problems solved by technology

However, using any one of them alone has different disadvantages. It is difficult to improve multiple performance indicators of CPVC products at the same time.

When the amount of CPE added reaches 5-15 parts, the product can obtain a good toughening and impact resistance effect, but it will significantly reduce the Vicat softening temperature of CPVC pipes by 6-10 ° C; The effect of Vicat softening temperature is small, but the MBS molecular chain contains unsaturated double bonds, which will cause double bond breakage under ultraviolet radiation, the strength will decrease instead, and the weather resistance is poor, so it cannot be stored outdoors or exposed for a long time; Adding ACR can increase the impact strength of the product dozens of times, but adding too much ACR will make the gelation rate of CPVC resin difficult to control. The work cannot go on; therefore, it is very necessary to use a composite toughening agent system and reasonably control the addition of each component to simultaneously improve multiple performance indicators of CPVC products

[0005] When CPVC products are stored for a long time or used on the surface, if raw materials containing double bonds are used in the formulation system, the performance of the product will be easily damaged during storage.

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