Permanent antistatic flexible polyethylene pipe special material

Abstract

The invention discloses a special material for permanent antistatic flexible PE (polyethylene) pipes. 100 parts of PE-RT resin by weight, 20-35 parts of a conductive master-batch by weight, 2-8 parts of a thermoplastic elastomer by weight, 1-5 parts of a dispersing agent by weight, 0-0.5 part of an antioxidant by weight, 0-0.5 part of a release agent by weight and 0-0.5 part of a liquid lubricant by weight are evenly mixed in a high-speed stirrer, then extruded by twin screws, cooled with water and granulated, and the machining temperature is in a range of 180-195 DEG C. The special material for the pipes is dried, then extruded to form the pipes, cooled and drawn to be prepared into finished products. Compared with the prior art, the special material has the advantages that the antistatic property is good, the permanent antistatic effect is realized, the tensile strength, the flexural strength and the impact strength are equivalent to those of pure PE-RT, the flexural modulus is lower, the advantage of the flexibility of the PE pipes is kept, the special material is convenient to transport, construct and install, good in environment resistance and low in cost, and the volume resistivity of the special material for the permanent antistatic flexible PE pipes can be stabilized at 106 ohm / cm.

Description

Technical field [0001] The invention relates to a special material for permanent antistatic bendable polyethylene pipes, which belongs to the technical field of composite materials. Background technique [0002] Under the call of "replace steel with plastic", plastics are used more and more widely. However, plastics have extremely high electrical resistance. During use, contact, friction, collisions, etc. will accumulate static charges on the surface of plastic products. And the static charge generated is difficult to transfer, and when it accumulates to a certain extent, it will bring safety risks. [0003] PE-RT is heat-resistant polyethylene. It adopts the copolymerization method of ethylene and octene to obtain a unique molecular structure by controlling the number and distribution of side chains to improve the heat resistance and toughness of PE. PE-RT pipe has good stability, aging resistance, long service life, excellent creep resistance, and the pipe is easy to bend and ea...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a special material for permanent antistatic flexible polyethylene pipes, to solve the problem of the polymer-based conductive carbon black composite system prepared by the existing general process, whose conductivity decreases sharply with the increase of temperature, and at 70 The problem of losing antistatic ability above ℃, through the invention, while maintaining the excellent mechanical properties of PE-RT pipes, that is, the tensile strength is 14.0MPa, the bending strength is 12.3MPa, the bending modulus is 325.5MPa, and the impact strength of the cantilever beam is constant. , the composite material has a lower flexural modulus, the pipe can be bent into a roll within a certain radius, and has permanent antistatic properties, good environmental adaptability, acid and alkali corrosion resistance, and good thermal creep resistance. Can maintain antistatic performance from room temperature to 125°C

Images