CN111186153A

CN111186153A - PE plastic pipeline manufacturing process

Info

Publication number: CN111186153A
Application number: CN202010010435.XA
Authority: CN
Inventors: 牛倩倩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-05-22

Abstract

The invention discloses a PE plastic pipeline manufacturing process which is characterized by comprising the following steps: step S1, preparation of a copolymer; step S2, mixing materials; step S3, extrusion molding; step S4, cooling and shaping; and step S5, cutting and rolling. The invention also discloses the PE plastic pipeline manufactured by the manufacturing process of the PE plastic pipeline. The PE plastic pipeline disclosed by the invention has the advantages of simple and feasible manufacturing process, small dependence on equipment, mild reaction conditions, low energy consumption, low defective rate, high preparation efficiency, suitability for continuous large-scale production and high economic value, social value and ecological value; the manufactured PE plastic pipeline has good comprehensive performance, mechanical property, weather resistance, wear resistance and performance stability.

Description

PE plastic pipeline manufacturing process

Technical Field

The invention relates to the technical field of plastic pipelines, in particular to a PE plastic pipeline manufacturing process.

Background

In recent years, with the progress of integration of urban and rural areas, various municipal basic construction projects are proposed as agenda, and the use of pipeline materials cannot be left behind the construction projects. PE (polyethylene) pipes are one of the most common pipes, have the advantages of low-temperature impact resistance, chemical corrosion resistance, wear resistance, etc., and are widely used in water supply, drainage, heat supply, gas supply, agricultural irrigation, water conservancy projects, and various industrial devices.

Polyethylene is a typical thermoplastic plastic, and has the characteristics of no odor, no odor and no toxicity, so the polyethylene is popularized and used, but in some severe environments or other important facility projects, the tensile strength of the PE pipe does not meet the requirement aiming at important places with larger bearing capacity or heavier load, and the actual production and use cannot be met. In addition, the PE pipes in the market are mainly made of polyethylene particles, various raw materials are mixed and formed in a section forming machine, the forming process comprises production processes of stirring, heating, extruding and the like, and finally the PE pipes are extruded out of a die. The PE pipe produced by the existing production process has the problems of strength not meeting the requirement, poor brightness and the like.

The Chinese invention patent with the application number of 201811413533.7 discloses a high-strength PE pipe, which is prepared from the following raw materials in parts by weight: 25-40 parts of polyethylene, 15-20 parts of ethylene propylene rubber, 6-8 parts of quartz sand, 3-5 parts of glass fiber reinforced plastic, 1-3 parts of activated carbon, 1-3 parts of color master batch and 1-3 parts of defoaming agent; the high-strength PE pipe provided by the invention has good corrosion resistance, abrasion resistance and higher strength, and is not easy to damage; however, the added elastomer ethylene propylene rubber has a large amount, so that the rigidity of the obtained pipe is insufficient, and in addition, the compatibility between the added inorganic component quartz sand and the organic component is poor, so that the added inorganic component quartz sand is easy to seep out of the base material in the long-term use process, the performance stability of the material is influenced, and the service life of the material is further shortened. On the other hand, the addition of glass fiber reinforced plastics to the raw material results in poor processing flowability and difficulty in molding due to the insoluble and infusible structure of glass fiber reinforced plastics.

Therefore, the development of the PE plastic pipeline manufacturing process which has the advantages of good comprehensive performance, good mechanical property, weather resistance, wear resistance and performance stability, simple manufacturing process and low manufacturing cost is particularly important, and has great significance for promoting the development of the plastic pipe industry.

Disclosure of Invention

The invention mainly aims to provide a manufacturing process of a PE plastic pipeline, which is simple and easy to implement, has small dependence on equipment, mild reaction conditions, small energy consumption, low defective rate and high preparation efficiency, is suitable for continuous large-scale production, and has high economic value, social value and ecological value; the manufactured PE plastic pipeline has good comprehensive performance, mechanical property, weather resistance, wear resistance and performance stability.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:

a PE plastic pipeline manufacturing process is characterized by comprising the following steps:

step S1, preparation of copolymer: adding 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine, 5- (vinyloxy) -1, 3-adamantane diol and an initiator into a high-boiling-point solvent, stirring and reacting for 4-7 hours at 65-75 ℃ in the atmosphere of nitrogen or inert gas, precipitating in water, washing the precipitated polymer for 3-6 times by using ethanol, and drying in a vacuum drying oven at 80-90 ℃ to constant weight to obtain a copolymer;

step S2, mixing materials: mixing the copolymer prepared in the step S1, waste polyolefin plastic, PE resin, ultrahigh molecular weight polyethylene fiber, nano boron fiber, a coupling agent and azodiisobutyronitrile, ball-milling in a ball mill, and sieving with a 50-200-mesh sieve to obtain a mixed material;

step S3, extrusion molding: adding the mixed material prepared in the step S2 into a double-screw extruder for mixing and extruding, extruding by a tubular die of an extruder head, and drawing a tube for forming to prepare a thick tube;

step S4, cooling and shaping: guiding the thick pipe manufactured in the step S3 into a cooling and shaping groove, quickly opening a spray pump, cooling and shaping for 3-5 hours, and checking the spraying condition once per hour in the normal production process; when the outer diameter of the produced pipe in the horizontal direction is larger and the outer diameter of the produced pipe in the vertical direction is smaller, the ovality correction device is adjusted;

step S5, cutting and rolling: and cutting the pipe according to a preset size, and coiling the pipe by using a coiling machine to obtain the PE plastic pipeline.

Preferably, the mass ratio of the 2- (trimethylsilyl) ethylene boronic acid pinacol ester, the perfluoroallylbenzene, the 6-allyl-1, 3, 5-triazine-2, 4-diamine, the 5- (vinyloxy) -1, 3-adamantanediol, the initiator and the high-boiling-point solvent in the step S1 is 1:2:1:1 (0.04-0.06): 15-25.

Preferably, the initiator is at least one of azobisisobutyronitrile and azobisisoheptonitrile.

Preferably, the high boiling point solvent is at least one of dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone.

Preferably, the mass ratio of the copolymer, the waste polyolefin plastic, the PE resin, the ultra-high molecular weight polyethylene fiber, the nano boron fiber, the coupling agent and the azobisisobutyronitrile in the step S2 is 1:1 (5-10):0.3:0.1 (0.03-0.06): 0.02.

Preferably, the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570.

Preferably, the waste polyolefin plastic is one of waste polyethylene, waste polypropylene and waste polyvinyl chloride.

Preferably, the temperature of the mixing extrusion in the step S3 is 180-230 ℃.

Preferably, the tube drawing forming process in step S3 specifically includes: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the traction machine is adjusted to 7.5A-8.5A, and the traction speed is 40-50 m/min.

Preferably, the diameter of the thick tube in step S3 is 500-800mm, and the thickness of the tube wall is 5-35 mm.

Another object of the present invention is to provide a PE plastic pipe manufactured according to the above-mentioned one.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

(1) the PE plastic pipeline manufacturing process comprises the steps of S1, preparation of a copolymer; step S2, mixing materials; step S3, extrusion molding; step S4, cooling and shaping; step S5, cutting and rolling; the whole process flow is short, relatively simple, does not use special equipment, has small dependence on equipment, mild reaction conditions, low energy consumption, low defective rate and high preparation efficiency, is suitable for continuous large-scale production, and has high economic value, social value and ecological value.

(2) According to the manufacturing process of the PE plastic pipeline, waste polyolefin plastics are added into the raw materials for preparing the pipe, waste materials are changed into valuable materials, reasonable reutilization of resources is realized, the environmental problem caused by the waste resources left unused is solved, the resources are saved, the cost is reduced, and the unification of economic benefits, social benefits and ecological benefits is realized.

(3) The PE plastic pipeline manufacturing process disclosed by the invention is added with a copolymer structure, the copolymer is prepared from 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine and 5- (vinyloxy) -1, 3-adamantane diol through radical copolymerization, and the structures have synergistic effect, so that the pipeline is good in mechanical property, good in weather resistance and excellent in performance stability; and the active groups of amino and hydroxyl on the copolymer can improve the surface activity of the material, enhance the compatibility between organic matters and inorganic matters, and further improve the comprehensive performance of the pipeline.

(4) According to the PE plastic pipeline manufacturing process, vinyl polymers such as the copolymer, the waste polyolefin plastic, the PE resin and the ultra-high molecular weight polyethylene fiber are easy to generate free radical polymerization grafting reaction under the action of the initiator, so that an organic whole is formed among the components, and the comprehensive performance of the PE plastic pipeline is improved.

(5) According to the PE plastic pipeline manufacturing process, the added ultra-high molecular weight polyethylene fibers and the nano boron fibers have synergistic effect, so that the enhancement effect on the pipeline strength is large, the effect is good, the advantages of organic fibers and inorganic fibers are combined, the dispersion uniformity and the compatibility with organic base materials of the nano boron fibers are improved through the addition of the coupling agent, and the comprehensive performance is better due to the synergistic effect of the raw materials.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

The raw materials in the embodiment of the invention are all purchased commercially.

Example 1

step S1, preparation of copolymer: adding 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine, 5- (vinyloxy) -1, 3-adamantane diol and azobisisobutyronitrile into dimethyl sulfoxide, stirring and reacting for 4 hours at 65 ℃ in a nitrogen atmosphere, precipitating in water, washing the precipitated polymer for 3 times by using ethanol, and drying in a vacuum drying oven at 80 ℃ to constant weight to obtain a copolymer; the mass ratio of the 2- (trimethylsilyl) ethylene boronic acid pinacol ester, the perfluoroallylbenzene, the 6-allyl-1, 3, 5-triazine-2, 4-diamine, the 5- (vinyloxy) -1, 3-adamantane diol, the azobisisobutyronitrile and the dimethyl sulfoxide is 1:2:1:1:0.04: 15;

step S2, mixing materials: mixing the copolymer prepared in the step S1, waste polyethylene, PE resin, ultrahigh molecular weight polyethylene fibers, nano boron fibers, a silane coupling agent KH550 and azobisisobutyronitrile, ball-milling in a ball mill, and sieving with a 50-mesh sieve to obtain a mixed material; the mass ratio of the copolymer to the waste polyethylene to the PE resin to the ultrahigh molecular weight polyethylene fibers to the nano boron fibers to the silane coupling agent KH550 to the azobisisobutyronitrile is 1:1:5:0.3:0.1:0.03: 0.02;

step S3, extrusion molding: adding the mixed material prepared in the step S2 into a double-screw extruder for mixing and extruding, extruding by a tubular die of an extruder head, and drawing a tube for forming to prepare a thick tube; the mixing and extruding temperature is 180 ℃; the tube drawing forming process specifically comprises the following steps: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the tractor is adjusted to 7.5A, and the traction speed is 40 m/min; the diameter of the thick pipe is 500mm, and the thickness of the pipe wall is 5 mm;

step S4, cooling and shaping: guiding the thick pipe manufactured in the step S3 into a cooling and shaping groove, quickly opening a spray pump, cooling and shaping for 3 hours, and checking the spraying condition once per hour in the normal production process; when the outer diameter of the produced pipe in the horizontal direction is larger and the outer diameter of the produced pipe in the vertical direction is smaller, the ovality correction device is adjusted;

A PE plastic pipe manufactured according to the manufacturing process of the PE plastic pipe.

Example 2

step S1, preparation of copolymer: adding 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine, 5- (vinyloxy) -1, 3-adamantane diol and azobisisoheptonitrile into N, N-dimethylformamide, stirring and reacting for 5 hours at 67 ℃ in a helium atmosphere, precipitating in water, washing the precipitated polymer for 4 times by using ethanol, and drying in a vacuum drying oven at 83 ℃ to constant weight to obtain a copolymer; the mass ratio of the 2- (trimethylsilyl) ethylene boronic acid pinacol ester to the perfluoroallylbenzene to the 6-allyl-1, 3, 5-triazine-2, 4-diamine to the 5- (vinyloxy) -1, 3-adamantane diol to the azodiisoheptanonitrile to the N, N-dimethylformamide is 1:2:1: 0.045: 17;

step S2, mixing materials: mixing the copolymer prepared in the step S1, waste polypropylene, PE resin, ultrahigh molecular weight polyethylene fiber, nano boron fiber, a silane coupling agent KH560 and azobisisobutyronitrile, ball-milling in a ball mill, and sieving with a 90-mesh sieve to obtain a mixed material; the mass ratio of the copolymer to the waste polypropylene to the PE resin to the ultrahigh molecular weight polyethylene fibers to the nano boron fibers to the silane coupling agent KH560 to the azobisisobutyronitrile is 1:1 (5-10) to 0.3:0.1 (0.03-0.06) to 0.02;

step S3, extrusion molding: adding the mixed material prepared in the step S2 into a double-screw extruder for mixing and extruding, extruding by a tubular die of an extruder head, and drawing a tube for forming to prepare a thick tube; the temperature of the mixing extrusion is 190 ℃; the tube drawing forming process specifically comprises the following steps: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the tractor is adjusted to 7.7A, and the traction speed is 43 m/min; the diameter of the thick pipe is 600mm, and the thickness of the pipe wall is 15 mm;

step S4, cooling and shaping: guiding the thick pipe manufactured in the step S3 into a cooling and shaping groove, quickly opening a spray pump, cooling and shaping for 3.5 hours, and checking the spraying condition once per hour in the normal production process; when the outer diameter of the produced pipe in the horizontal direction is larger and the outer diameter of the produced pipe in the vertical direction is smaller, the ovality correction device is adjusted;

Example 3

step S1, preparation of copolymer: adding 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine, 5- (vinyloxy) -1, 3-adamantane diol and azodiisoheptanonitrile into N, N-dimethylacetamide, stirring and reacting for 5.5 hours at 70 ℃ in a neon atmosphere, then precipitating in water, washing the precipitated polymer for 5 times by using ethanol, and then drying in a vacuum drying oven at 85 ℃ to constant weight to obtain a copolymer; the mass ratio of the 2- (trimethylsilyl) ethylene boronic acid pinacol ester to the perfluoroallylbenzene to the 6-allyl-1, 3, 5-triazine-2, 4-diamine to the 5- (vinyloxy) -1, 3-adamantane diol to the azodiisoheptanonitrile to the N, N-dimethylacetamide is 1:2:1:1:0.05: 20;

step S2, mixing materials: mixing the copolymer prepared in the step S1, waste polyvinyl chloride, PE resin, ultrahigh molecular weight polyethylene fibers, nano boron fibers, a silane coupling agent KH570 and azobisisobutyronitrile, ball-milling in a ball mill, and sieving with a 120-mesh sieve to obtain a mixed material; the mass ratio of the copolymer to the waste polyvinyl chloride to the PE resin to the ultrahigh molecular weight polyethylene fibers to the nano boron fibers to the silane coupling agent KH570 to the azobisisobutyronitrile is 1:1:8:0.3:0.1:0.045: 0.02;

step S3, extrusion molding: adding the mixed material prepared in the step S2 into a double-screw extruder for mixing and extruding, extruding by a tubular die of an extruder head, and drawing a tube for forming to prepare a thick tube; the mixing and extruding temperature is 200 ℃; the tube drawing forming process specifically comprises the following steps: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the tractor is adjusted to 8A, and the traction speed is 45 m/min; the diameter of the thick pipe is 650mm, and the thickness of the pipe wall is 25 mm;

step S4, cooling and shaping: guiding the thick pipe manufactured in the step S3 into a cooling and sizing groove, quickly opening a spray pump, cooling and sizing for 4 hours, and checking the spraying condition once per hour in the normal production process; when the outer diameter of the produced pipe in the horizontal direction is larger and the outer diameter of the produced pipe in the vertical direction is smaller, the ovality correction device is adjusted;

Example 4

step S1, preparation of copolymer: adding 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine, 5- (vinyloxy) -1, 3-adamantane diol and an initiator into a high-boiling-point solvent, stirring and reacting for 6.5 hours at 73 ℃ under an argon atmosphere, then precipitating in water, washing the precipitated polymer for 6 times by using ethanol, and then placing in a vacuum drying oven for drying at 88 ℃ to constant weight to obtain a copolymer; the mass ratio of the 2- (trimethylsilyl) ethylene boronic acid pinacol ester to the perfluoroallylbenzene to the 6-allyl-1, 3, 5-triazine-2, 4-diamine to the 5- (vinyloxy) -1, 3-adamantane diol to the initiator to the high-boiling-point solvent is 1:2:1:10.055: 23; the initiator is formed by mixing azodiisobutyronitrile and azodiisoheptonitrile according to the mass ratio of 2: 5; the high-boiling-point solvent is formed by mixing dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone according to a mass ratio of 1:1:2: 3;

step S2, mixing materials: mixing the copolymer prepared in the step S1, waste polypropylene, PE resin, ultrahigh molecular weight polyethylene fibers, nano boron fibers, a coupling agent and azodiisobutyronitrile, ball-milling in a ball mill, and sieving with a 180-mesh sieve to obtain a mixed material; the mass ratio of the copolymer to the waste polypropylene to the PE resin to the ultrahigh molecular weight polyethylene fibers to the nano boron fibers to the coupling agent to the azodiisobutyronitrile is 1:1:9:0.3:0.1:0.05: 0.02; the coupling agent is formed by mixing a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH570 according to the mass ratio of 1:3: 2;

step S3, extrusion molding: adding the mixed material prepared in the step S2 into a double-screw extruder for mixing and extruding, extruding by a tubular die of an extruder head, and drawing a tube for forming to prepare a thick tube; the mixing and extruding temperature is 220 ℃; the tube drawing forming process specifically comprises the following steps: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the traction machine is adjusted to 8.4A, and the traction speed is 48 m/min; the diameter of the thick pipe is 750mm, and the thickness of the pipe wall is 30 mm;

step S4, cooling and shaping: guiding the thick pipe manufactured in the step S3 into a cooling and shaping groove, quickly opening a spray pump, cooling and shaping for 4.5 hours, and checking the spraying condition once per hour in the normal production process; when the outer diameter of the produced pipe in the horizontal direction is larger and the outer diameter of the produced pipe in the vertical direction is smaller, the ovality correction device is adjusted;

Example 5

step S1, preparation of copolymer: adding 2- (trimethylsilyl) ethylene boronic acid pinacol ester, perfluoroallylbenzene, 6-allyl-1, 3, 5-triazine-2, 4-diamine, 5- (vinyloxy) -1, 3-adamantane diol and azobisisoheptonitrile into N-methylpyrrolidone, stirring and reacting for 7 hours at 75 ℃ in a nitrogen atmosphere, precipitating in water, washing the precipitated polymer for 6 times by using ethanol, and drying at 90 ℃ in a vacuum drying oven to constant weight to obtain a copolymer; the mass ratio of the 2- (trimethylsilyl) ethylene boronic acid pinacol ester to the perfluoroallylbenzene to the 6-allyl-1, 3, 5-triazine-2, 4-diamine to the 5- (vinyloxy) -1, 3-adamantane diol to the azodiisoheptanonitrile to the N-methylpyrrolidone is 1:2:1: 0.06: 25;

step S2, mixing materials: mixing the copolymer prepared in the step S1, waste polyethylene, PE resin, ultrahigh molecular weight polyethylene fibers, nano boron fibers, a silane coupling agent KH560 and azobisisobutyronitrile, ball-milling in a ball mill, and sieving with a 200-mesh sieve to obtain a mixed material; the mass ratio of the copolymer to the waste polyethylene to the PE resin to the ultrahigh molecular weight polyethylene fibers to the nano boron fibers to the silane coupling agent KH560 to the azobisisobutyronitrile is 1:1:10:0.3:0.1:0.06: 0.02;

step S3, extrusion molding: adding the mixed material prepared in the step S2 into a double-screw extruder for mixing and extruding, extruding by a tubular die of an extruder head, and drawing a tube for forming to prepare a thick tube; the mixing and extruding temperature in the step S3 is 230 ℃; the tube drawing forming process specifically comprises the following steps: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the tractor is adjusted to 8.5A, and the traction speed is 50 m/min; the diameter of the thick pipe is 800mm, and the thickness of the pipe wall is 35 mm;

step S4, cooling and shaping: guiding the thick pipe manufactured in the step S3 into a cooling and shaping groove, quickly opening a spray pump, cooling and shaping for 5 hours, and checking the spraying condition once per hour in the normal production process; when the outer diameter of the produced pipe in the horizontal direction is larger and the outer diameter of the produced pipe in the vertical direction is smaller, the ovality correction device is adjusted;

Comparative example 1

This example provides a process for making a PE plastic pipe substantially the same as example 1, except that no copolymer is added.

Comparative example 2

This example provides a process for making a PE plastic pipe that is substantially the same as example 1, except that no ultra high molecular weight polyethylene fibers are added.

Comparative example 3

This example provides a PE plastic pipe manufacturing process that is essentially the same as example 1, except that no nano boron fibers are added.

Meanwhile, in order to evaluate the specific technical effects of the manufacturing process of the PE plastic pipe of the present invention, the PE plastic pipes in the examples and comparative examples of the present invention were used for performance tests, and the test results and test methods are shown in table 1.

TABLE 1

As can be seen from Table 1, the PE plastic pipeline prepared by the PE plastic pipeline manufacturing process disclosed by the embodiment of the invention has the tensile strength of 54-63MPa and the impact strength of 9.3-10.6kJ/m²The limiting oxygen is 41-47%; the PE plastic pipeline prepared by the PE plastic pipeline manufacturing process in the comparative example has the tensile strength of 30-36MPa and the impact strength of 5.8-6.4kJ/m²The limiting oxygen means 25-40%. Therefore, the copolymer, the ultra-high molecular weight polyethylene fiber and the nano boron fiber have beneficial effects on improving the performances, and the excellent performances of the PE plastic pipeline prepared by the PE plastic pipeline manufacturing process prepared by the preparation method disclosed by the embodiment of the invention are the results of the synergistic effect of the components.

The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.

Claims

1. A PE plastic pipeline manufacturing process is characterized by comprising the following steps:

2. The PE plastic pipe manufacturing process according to claim 1, wherein the mass ratio of the 2- (trimethylsilyl) ethyleneboronic acid pinacol ester, the perfluoroallylbenzene, the 6-allyl-1, 3, 5-triazine-2, 4-diamine, the 5- (vinyloxy) -1, 3-adamantanediol, the initiator and the high boiling point solvent in step S1 is 1:2:1:1 (0.04-0.06): 15-25.

3. The process of claim 1, wherein said initiator is at least one of azobisisobutyronitrile and azobisisoheptonitrile.

4. The process of claim 1, wherein the high boiling point solvent is at least one of dimethylsulfoxide, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone.

5. The process for manufacturing the PE plastic pipeline according to claim 1, wherein the mass ratio of the copolymer, the waste polyolefin plastic, the PE resin, the ultra-high molecular weight polyethylene fiber, the nano boron fiber, the coupling agent and the azobisisobutyronitrile in the step S2 is 1:1 (5-10) to 0.3:0.1 (0.03-0.06) to 0.02.

6. The PE plastic pipeline manufacturing process according to claim 1, wherein the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560, and a silane coupling agent KH 570.

7. The process for manufacturing PE plastic pipes according to claim 1, wherein the waste polyolefin plastic is one of waste polyethylene, waste polypropylene and waste polyvinyl chloride.

8. The PE plastic pipe manufacturing process according to claim 1, wherein the temperature of the mixing and extrusion in step S3 is 180-230 ℃.

9. The PE plastic pipeline manufacturing process according to claim 1, wherein the tube drawing forming process in the step S3 is specifically: leading out the extruded material after passing through a die head and a vacuum cooling forming machine under the traction of a traction machine; the current of the traction machine is adjusted to 7.5A-8.5A, and the traction speed is 40-50 m/min; in step S3, the diameter of the thick tube is 500-800mm, and the thickness of the tube wall is 5-35 mm.

10. A PE plastic pipe manufactured by a PE plastic pipe manufacturing process according to any one of claims 1-9.