Gas drainage high-impact PVC (polyvinyl chloride) pipe for coal mine and preparation method thereof

Abstract

The invention relates to the technical field of plastic pipes for coal mines, in particular to a gas drainage high-impact PVC pipe for a coal mine and a preparation method of the PVC pipe. The gas drainage high-impact PVC pipe for the coal mine is composed of an inner skin layer, an outer skin layer and a core layer, and the inner skin layer and the outer skin layer are prepared from PVC resin A, an organic tin stabilizer A, an impact modifier A, carbon nanotubes, a plasticizer, an antioxidant A, a lubricant A and a flame retardant; the core layer is prepared from the following raw materials in parts by mass: PVC resin B, an organic tin stabilizer B, an impact modifier B, a processing aid, an antioxidant B, a lubricant B, a coloring agent and filler. The gas drainage high-impact-resistance PVC pipe for the coal mine is of a three-layer composite structure, the inner surface and the outer surface of the pipe have good long-term conductivity, the pipe is high in impact resistance and good in corrosion resistance, the flame-retardant and antistatic performance of the PVC pipe meets the mining polyvinyl chloride pipe standard, and the physical and mechanical performance meets the urban construction industry standard.

Description

technical field [0001] The invention relates to the technical field of plastic pipes for coal mines, in particular to a PVC pipe with high impact resistance for gas drainage in coal mines and a preparation method thereof. Background technique [0002] For a long time, coal mines have used cast iron pipes for underground drainage, ventilation, and dust collection. Because the cast iron pipe is easy to corrode, it is inconvenient to carry and install, the service life is short, and the cost is high. Polyvinyl chloride (PVC) pipes have many advantages that metal pipes cannot match: light weight and low price, simple installation and operation, corrosion resistance, good flame retardancy, and have gradually replaced metal pipes in many fields. However, PVC is a good insulator with high surface resistance and poor conductivity. In places where static electricity is easily generated, such as coal mines, it may cause fire or gas explosion due to the accumulation of static electric...

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Problems solved by technology

[0005] The high-impact pipes involved in the above-mentioned patents do not have normal temperature and high-speed impact tests. The use of conductive carbon black as an antistatic agent for the inner and outer layers not only requires a large amount of antistatic agent, but also causes high processing and extrusion currents, poor physical and mechanical properties of the pipes, and low surface finish of the pipes. Difficulty extruding

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