Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method

A radiation cross-linking, polyethylene technology, applied in the field of plastic pipes, can solve the problems of having to operate on the construction site, short-term memory effect, etc.

Inactive Publication Date: 2011-06-29
TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, domestic and foreign internal pipeline anti-corrosion technologies are mainly concentrated in two aspects: one is pipeline internal coating technology, and the other is pipeline plastic lining technology; coating technology has been reported a lot in China, of course it has many advantages, such as low cost; and Plastic lining technology has risen with a new attitude in foreign countries; there are deficiencies in the existing methods, products and technologies for plastic lining of pipelines: for example: Chinese patent CN1051783A describes that a section is larger than the inner diameter of the pipeline to be lined and has the ability to maintain When a tube made of resilient plastic material is pulled through a mold or roller, its outer diameter is reduced by 15% and pulled into the pipeline to be lined, using force to produce elastic deformation of the material, making it have a short-term memory effect, to be removed After the tension, the pipe will naturally recover its expansion diameter and closely fit the inner wall of the pipe; this method must be operated on the construction site and re...

Method used

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  • Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method
  • Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method
  • Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method

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Experimental program
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Embodiment 1

[0019] Radiation cross-linked polyethylene thermal expansion tube, its composition includes: linear polyethylene LLDPE, high-density polyethylene HDPE, low-density polyethylene LDPE, copolymer EVA of vinyl acetate and ethylene, tetrakis [β-(3,5-di-tert-butyl Base-4-hydroxyphenyl) propionate] pentaerythritol ester and black masterbatch, the parts by weight of the linear polyethylene LLDPE is 100, the parts by weight of the high-density polyethylene HDPE is 30, the parts by weight of the described The parts by weight of the low-density polyethylene LDPE is 20, the parts by weight of the copolymer EVA of vinyl acetate and ethylene is 10, and the parts by weight of the tetrakis[β-(3,5-di-tert-butyl-4-hydroxy The parts by weight of phenyl) propionate] pentaerythritol ester is 0.8, and the parts by weight of the described black masterbatch is 0.6, and the described black masterbatch is a kind of saturated carbon black used in plastic processing to adjust the processed The granular r...

Embodiment 2

[0022] The manufacturing method of the radiation-crosslinked polyethylene heat-expandable tube described in embodiment 1:

[0023] Step 1: Take various raw materials of the radiation cross-linked polyethylene thermal expansion pipe according to the above ratio, and extrude the pipe.

[0024] Step 2: Saw the pipe extruded in the first step into a pipe section 2, put the sawed pipe section 2 on the squirrel cage 3, rotate and translate, the moving direction is perpendicular to the scanning direction, and the moving speed of the pipe is 1 m / min , cross-linked plastic tubing was obtained after scanning the box several times through an electron accelerator 1 . The irradiation dose is 90-110 kJ / kg, and the degree of cross-linking is 50%-60%.

[0025] Step 3: Clamp the pipe cross-linked in the second step on the prefabricated fixture, put it in the temperature control box for preheating, the preheating temperature is 135°C±5°C; pull the preheated pipe through a fixed Diameter mold,...

Embodiment 3

[0027] The radiation-crosslinked polyethylene thermal expansion pipe described in embodiment 1 or 2, the plastic pipe made by the above method can be made of radiation-crosslinkable polyethylene PE or polyethylene PE and ethylene vinyl acetate copolymer EVA The polymer produced by the blend; the wall thickness of the plastic pipe is: 2mm-5mm, the outer diameter of the pipe is 40mm-300mm, the gel rate of the pipe is 50%-60%, and the radial expansion rate after heating is 5%- 15%, axial shrinkage 4%-13%.

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Abstract

The invention relates to a radiation cross-linked polyethylene thermal expansion pipe and a manufacturing method. The methods, products and techniques of the existing lined plastics of pipelines have defects. The radiation cross-linked polyethylene thermal expansion pipe provided by the invention comprises the following components in parts by weight: 100 parts of linear low density polyethylene (LLDPE), 30 parts of high density polyethylene (HDPE), 20 parts of low density polyethylene (LDPE), 10 parts of ethylene-vinyl acetate (EVA), 0.8 part of tetra(beta-(3, 5-bibutyl-4-hydroxyphenyl) propionic acid) pentaerythritol ester and 0.6 part of black masterbatch, wherein the mixture capable of carrying out radiation cross-linking is prepared into a polymer pipeline. The radiation cross-linked polyethylene thermal expansion pipe provided by the invention can be used for the field joint repair of a coating in a pipeline, the corrosion resistance and scale resistance in the pipeline, the pipeline repair with pitting corrosion, the lining in a special liquid conveying pipeline and the like.

Description

Technical field: [0001] The invention relates to a plastic pipe made of radiation cross-linked polyethylene and having the function of diameter expansion after heating, in particular to a radiation cross-linked polyethylene heat-expandable pipe and a manufacturing method. Background technique: [0002] At present, domestic and foreign internal pipeline anti-corrosion technologies are mainly concentrated in two aspects: one is pipeline internal coating technology, and the other is pipeline plastic lining technology; coating technology has been reported a lot in China, of course it has many advantages, such as low cost; and Plastic lining technology has risen with a new attitude in foreign countries; there are deficiencies in the existing methods, products and technologies for plastic lining of pipelines: for example: Chinese patent CN1051783A describes that a section is larger than the inner diameter of the pipeline to be lined and has the ability to maintain When a tube made...

Claims

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Application Information

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IPC IPC(8): F16L11/04F16L58/16C08L23/06C08L23/08C08L31/04C08K5/134
Inventor 王玉宝王强斯琴图雅田汝超
Owner TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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