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Grafted modified radiation crosslinked polyethylene heat resistant pipe and preparation method thereof

A cross-linked polyethylene and graft-modified technology, which is applied in the field of graft-modified radiation cross-linked polyethylene heat-resistant pipes and their preparation, can solve problems such as the breakdown radiation dose of pipes, and achieve the elimination of local breakdown. , The effect of reducing the radiation dose and improving the yield

Inactive Publication Date: 2017-09-26
吉林美高管道系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems in the prior art that the preparation of polyethylene pipes by radiation cross-linking method is easy to cause local breakdown of the pipes and high radiation dose, and to provide a graft-modified radiation cross-linked polyethylene heat-resistant Pipe and its preparation method

Method used

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  • Grafted modified radiation crosslinked polyethylene heat resistant pipe and preparation method thereof
  • Grafted modified radiation crosslinked polyethylene heat resistant pipe and preparation method thereof
  • Grafted modified radiation crosslinked polyethylene heat resistant pipe and preparation method thereof

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preparation example Construction

[0025] A preparation method of a graft-modified radiation cross-linked polyethylene heat-resistant pipe of the present invention comprises the following steps:

[0026] Step 1, using a cobalt source or an electron accelerator to pre-irradiate the high-density polyethylene with an irradiation dose of 0.1-1 Mrad to obtain pre-irradiated high-density polyethylene;

[0027] Step 2, according to the mass ratio is (40-80): (1-4), preferably (70-80): (3-4), the pre-irradiated high-density polyethylene obtained in step 1 and triallyl Isocyanurate is physically mixed, mixed evenly and added to the twin-screw extruder, after pulling out, cooling, and pelletizing, high-density polyethylene grafts are obtained, and the extrusion temperature is 180-220°C;

[0028] Step 3, according to the mass ratio is (50-100): (15-55): (2-6), preferably (80-100): (35-55): (5-6), high density polyethylene, The high-density polyethylene graft obtained in step 2 is physically mixed with the antioxidant B21...

Embodiment 1

[0033] Step 1, using an electron accelerator to pre-irradiate the high-density polyethylene with an irradiation dose of 0.4 Mrad to obtain pre-irradiated high-density polyethylene;

[0034] Step 2. According to the mass ratio of 40:1, after the pre-irradiated high-density polyethylene obtained in step 1 and TAIC are physically mixed evenly, they are added to a twin-screw extruder, and after pulling out, cooling, and pelletizing, the obtained High-density polyethylene grafts;

[0035] Step 3: Physically mix high-density polyethylene, high-density polyethylene branches obtained in step 2, and antioxidant B215 according to a mass ratio of 50:15:2, and then add a high-speed extruder to extrude at 180-220°C Pipe material, obtains the polyethylene pipe material of graft modification;

[0036] Step 4: Using an electron accelerator to irradiate the grafted modified polyethylene pipe obtained in Step 3 at a dose of 9 Mrad to obtain a graft modified radiation crosslinked polyethylene h...

Embodiment 2

[0038] Step 1, using a cobalt source to pre-irradiate the high-density polyethylene, and the irradiation measurement is 0.6 Mrad to obtain pre-irradiated high-density polyethylene;

[0039] Step 2. According to the mass ratio of 50:2, after the pre-irradiated high-density polyethylene obtained in step 1 and TAIC are physically mixed evenly, they are added to a twin-screw extruder, and after pulling out, cooling, and pelletizing, the obtained High-density polyethylene grafts;

[0040] Step 3: According to the mass ratio of 60:20:3, HDPE, the high-density polyethylene graft obtained in Step 2, and antioxidant B215 are physically mixed evenly, and then added to a high-speed extruder to extrude at 180-220°C The pipe is discharged to obtain a graft-modified polyethylene pipe;

[0041] Step 4: Using an electron accelerator to irradiate the grafted modified polyethylene pipe obtained in Step 3 at a dose of 8.5 Mrad to obtain a graft modified radiation crosslinked polyethylene heat-r...

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Abstract

The invention discloses a grafted modified radiation crosslinked polyethylene heat resistant pipe and a preparation method thereof, and belongs to the technical field of polyethylene pipes. The grafted modified radiation crosslinked polyethylene heat resistant pipe solves the problem that a polyethylene pipe prepared through an irradiation crosslinking method is easy to cause easiness in breakdown of part of the pipe and high irradiation dose in the prior art. The method comprises the following steps: performing pre-irradiation on high density polyethylene, so as to obtain pre-irradiated high density polyethylene; then adding the pre-irradiated high density polyethylene and a polyfunctional monomer into a reactive extruder after being physically mixed, and performing traction, cooling and granulation, so as to obtain high density polyethylene graft; extruding the high density polyethylene, the high density polyethylene graft and an antioxidant into a pipe through a high-speed extruder after being physically mixed, so as to obtain a grafted modified polyethylene pipe; performing secondary irradiation crosslinking on the obtained grafted modified polyethylene pipe, so as to obtain the grafted modified radiation crosslinked polyethylene heat resistant pipe. The pipe prepared through the method is not only good in temperature resistance, high in tearing strength and high in creep resistance, but also low in irradiation, without irradiation breakdown.

Description

technical field [0001] The invention belongs to the technical field of radiation cross-linked polyethylene pipes, in particular to a graft-modified radiation cross-linked polyethylene heat-resistant pipe and a preparation method thereof. Background technique [0002] Polyethylene (PE for short) is a thermoplastic resin obtained by polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of α-olefins. Polyethylene is odorless, non-toxic, and feels like wax. It has excellent low temperature resistance (the lowest operating temperature can reach -100 ~ -70 ° C), good chemical stability, and can withstand most acid and alkali erosion (not resistant to oxidation) nature of acid), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation, widely used in pipes, injection molding products, wire wrapping and other fields. [0003] In the prior art, the preparation methods of polyethylene pipes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L51/06C08K5/134C08K5/526C08J7/12C08F255/02C08F226/06
CPCC08L23/06C08F255/02C08J7/123C08J2323/06C08J2451/06C08L2201/08C08L2203/18C08L2207/062C08L2312/06C08F226/06C08L51/06C08K5/1345C08K5/526
Inventor 王海波钟山姚占海
Owner 吉林美高管道系统有限公司
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