Compression-resistant and high-temperature-resistant CPVC (chlorinated polyvinyl chloride) pipe fitting and forming process thereof

Abstract

The invention belongs to the technical field of CPVC forming, and particularly relates to a compression-resistant and high-temperature-resistant CPVC pipe fitting and a forming process thereof. The forming process of the compression-resistant and high-temperature-resistant CPVC pipe fitting comprises the following steps: heating and premixing CPVC resin, nitrile rubber and an additive; transferring the premixed materials into mixing equipment for mixing; and transferring the mixed material into an extruder, heating and plasticizing, and extruding from a tubular mouth die to obtain the CPVC pipe fitting. The mixing temperature is 165 to 190 DEG C; the temperature in the material extrusion process is 180-210 DEG C; the pressure in the material extrusion process is 1.8 to 2.5 MPa; the additives comprise a heat stabilizer methyl tin, a synergistic auxiliary agent ethyl 4-ethoxy benzoate, an internal lubricant, an external lubricant and a processing auxiliary agent. The prepared pipe has excellent comprehensive performance in the aspects of thermal stability, tensile strength, extensibility and impact resistance, and can be used as a buried high-voltage power cable protection pipe.

Description

technical field [0001] The invention belongs to the technical field of CPVC molding, and particularly relates to a compression-resistant and high-temperature-resistant CPVC pipe fitting and a molding process thereof. Background technique [0002] CPVC is the abbreviation of chlorinated polyvinyl chloride, also called perchloride. CPVC has the advantage of being convenient to manufacture and has a wide range of sources. It can be obtained by chlorination of polyvinyl chloride (PVC) resin. Therefore, it can also be considered that CPVC is an important modified variety of polyvinyl chloride resin. [0003] The structure of CPVC molecular chain is simple, does not contain complex active groups, and the chlorine content in its molecular structure is extremely high, theoretically up to 73%, conventionally up to 60-70%, so it has good flame retardant performance. In addition, CPVC material also has good insulation properties, so it has a wide range of application prospects in the ...

AI Technical Summary

Problems solved by technology

For this reason, in reality, the heat resistance is often further improved by adding inorganic modification additives such as calcium carbonate and montmorillonite. However, the improvement of heat resistance by this method is relatively limited. The ductility of the CPVC pipe is further reduced, and the brittleness is further increased, which leads to brittle cracking of the CPVC pipe after being compressed, and loses its protective effect.

Images