RTP tube and production technology thereof

Abstract

The invention especially relates to an RTP tube and a production technology thereof, and belongs to the technical field of production of thermoplastic tubes. The tube comprises an outer layer, a middle layer and a lining layer, the outer layer is made of HDPE, the middle layer is made of glass fiber reinforced HDPE, and the lining layer is made of PE80 or / and PE100 grade HDPE. The glass fiber reinforced HDPE is prepared from 30-35% of HDPE, 50-65% of glass fibers, 0.1-0.6% of an antioxidant, 2-8% of a compatilizer and 0.2-1.9% of a flowable agent; and the antioxidant is an antioxidant 1010, the compatilizer is polyethylene grafted maleic anhydride, and the flowable agent is hyperbranched resin. The tube has excellent performances, and the production technology has the advantages of simpleprocess, high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of reinforced thermoplastic pipe production, in particular to an RTP pipe and a production process. Background technique [0002] Reinforced thermoplastic pipes are mainly used in the fields of oil, natural gas, high-pressure water and special fluid transportation. They can withstand high pressure, impact resistance, corrosion resistance, and the pipes have better flexibility. In the invention patent application with the publication number CN102691832A, a glass fiber reinforced HDPE double-wall winding pipe and its manufacturing method are disclosed. Through the modified high-density polyethylene mixture, the compatibility between glass fiber and polyethylene is improved, so that the final glass fiber reinforced polyethylene has the characteristics of creep resistance, high strength, high toughness, wear resistance and high temperature resistance. [0003] In addition, the invention patent with the publicat...

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Problems solved by technology

[0004] Although the above two patent documents disclose related modification formulas, production processes and equipment for reinforced thermoplastic pipes, there are still places for improvement in the two patent documents

The first is the patent with the publication number CN102691832A. Its high-density polyethylene compound is prepared with five ingredients, and the modified glass fiber is also prepared with two ingredients. After the two are prepared separately, they are formulated according to a certain weight Reactive co-extrusion molding is carried out in the extruder, too many ingredients increase the cost, there are too many variables to be controlled during the preparation, the process is complicated, and the time cost and labor cost will also increase; followed by the invention patent with the publication number CN101474873A , There are two winding heads on the winding machine, and each layer has two reinforcing tapes intersecting each other. When multiple winding machines perform multi-layer winding, the winding angle and direction are basically the same. The reinforcing tapes are layered one by one. There is no intersection between layers, burst pressure, and the texture produced by cross-winding in a single layer will form a groove-like texture after multi-layer superimposition. Since the texture is not covered by the reinforcement tape, after multi-layer winding superimposition, the reinforcement tape has no Uniform winding on the inner tube will reduce the local compressive capacity, thus affecting the overall performance

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