CN114992395A

CN114992395A - Modified polyethylene wear-resistant composite pipe and forming process thereof

Info

Publication number: CN114992395A
Application number: CN202210725059.1A
Authority: CN
Inventors: 林津强
Original assignee: GUANGDONG EAST PIPES CO LTD
Current assignee: GUANGDONG EAST PIPES CO LTD
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-09-02

Abstract

The invention provides a modified polyethylene wear-resistant composite pipe and a forming process thereof, wherein the modified polyethylene wear-resistant composite pipe comprises the following components: the inner layer pipe body, the outer layer pipe body, the supporting layer and the protective layer. The outer pipe body is fixedly connected with the inner pipe body, and the outer pipe body is coaxially arranged with the inner pipe body. The supporting layer is positioned between the inner-layer pipe body and the outer-layer pipe body; and the protective layer is positioned on the periphery of the outer-layer pipe body. The protective layer comprises a coating layer and glass fiber wires, the coating layer is located on the outermost side of the outer-layer pipe body, and the glass fiber wires are wound on the outer-layer pipe body. The glass fiber wires are coated in the coating layer, multiple layers of the glass fiber wires can be arranged on the outer layer pipe body in an allowable mode, and winding directions of the glass fiber wires of adjacent layers on the outer layer pipe body are opposite. The invention can effectively solve the problems of lower surface hardness and poorer abrasion resistance of the common modified polyethylene pipe.

Description

Modified polyethylene wear-resistant composite pipe and forming process thereof

Technical Field

The invention relates to the field of composite pipes, in particular to a modified polyethylene wear-resistant composite pipe and a forming process thereof.

Background

The polyethylene pipe has the performance characteristics of good flexibility, high impact strength, corrosion resistance, light weight, convenient transportation and installation and accordance with the water supply sanitary requirements, and simultaneously has unique electric melting connection, hot melting butt joint and hot melting socket joint connection technologies, so that the safety and reliability of the interface can be effectively ensured. The polyethylene pipe is suitable for water supply and drainage, fire protection and gas transportation of municipal and buildings, and can be widely applied to medium transportation in the fields of chemical industry, petroleum, medicine and the like. However, the surface hardness of the common modified polyethylene pipe is low, and the abrasion resistance is poor, so that the polyethylene pipe still has certain limitations in the actual use process.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a modified polyethylene wear-resistant composite pipe and a forming process thereof, so as to solve the problems of low surface hardness and poor wear resistance of a common modified polyethylene pipe.

To achieve the above and other related objects, the present invention provides a modified polyethylene abrasion-resistant composite pipe, comprising:

an inner pipe body;

the outer pipe body is fixedly connected with the inner pipe body, and the outer pipe body and the inner pipe body are coaxially arranged;

the supporting layer is positioned between the inner-layer pipe body and the outer-layer pipe body; and

the inoxidizing coating is located outer body is peripheral, and it includes:

the coating layer is positioned on the outermost side of the outer-layer pipe body; and

the glass fiber wire is wound on the outer layer pipe body and is coated in the coating layer;

the glass fiber wires are arranged on the outer layer pipe body in a multi-layer mode, and winding directions of the glass fiber wires on the outer layer pipe body in adjacent layers are opposite.

In one scheme of the invention, the supporting layer is a steel wire mesh skeleton structure, and the steel wire mesh skeleton structure is provided with at least one layer.

In one scheme of the invention, the inner pipe body and the outer pipe body are made of modified polyethylene, and the modified polyethylene comprises the following raw materials in parts by weight: 60-80 parts of high-density polyethylene, 15-30 parts of low-density polyethylene, 5-30 parts of coupling agent, 1-3 parts of carbon black master batch, 5-40 parts of filler, 0.1-20 parts of modified white graphene, 0.05-10 parts of antioxidant and 0.5-15 parts of dispersing agent.

In one scheme of the invention, the modified white graphene is prepared by soaking white graphene with 6-9 layers in 0.1-0.5% surfactant solution for 23-27 hours, centrifuging and vacuum drying.

In one embodiment of the present invention, the carbon black masterbatch is carbon black N330.

In one scheme of the invention, the coating layer comprises the following raw material components in parts by weight: 40-65 parts of methyl silicone resin, 0.2-1 part of dispersing agent, 0.2-0.6 part of flatting agent, 5-10 parts of diluent, 5-10 parts of curing agent, 2-4 parts of solvent, 15-20 parts of silane coupling agent and 5-10 parts of filler; wherein the mass ratio of the methyl silicone resin to the curing agent is (6.5-8): 1.

In one scheme of the invention, the coating layer comprises the following raw material components in parts by weight: 50 parts of methyl silicone resin, 0.7 part of dispersing agent, 0.4 part of flatting agent, 7 parts of diluting agent, 7 parts of curing agent, 3 parts of solvent, 17 parts of silane coupling agent and 7 parts of filling material; wherein the mass ratio of the methyl silicone resin to the curing agent is 7: 1.

In one aspect of the present invention, the filler includes graphene, graphite, a transition metal oxide, a composite silicate, a rare earth oxide, and a metal material; wherein the transition group metal oxide is selected from one or more of chromium oxide, titanium oxide, molybdenum oxide, niobium oxide and zirconium oxide, and the metal material is selected from one or more of nickel, titanium, chromium, manganese, copper and aluminum.

The invention also provides a molding process of the modified polyethylene wear-resistant composite pipe, which comprises the following steps:

step S10, preparing basic raw materials required by preparing the composite tube, proportioning the components in the basic raw materials according to parts by mass, and fully stirring and mixing, wherein the basic raw materials comprise: modified polyethylene raw materials and coating layer raw materials;

step S20, introducing the modified polyethylene raw material into a forming device, and preparing an inner-layer pipe body and an outer-layer pipe body through the forming device;

step S30, arranging a supporting layer between the inner layer pipe body and the outer layer pipe body, and bonding the inner layer pipe body and the outer layer pipe body;

step S40, coating the coating layer raw material on the glass fiber wire and then winding the glass fiber wire on the outer layer pipe body;

step S50, spraying the coating layer raw material on the outer layer pipe body by adopting a spraying process to obtain a coating layer 101 with the thickness of 20-40 microns, and curing at the temperature of 30-35 ℃ for 2-3 h;

and S60, repeating the step S50 to ensure that the total thickness of the coating layer is 100-200 mu m, wherein the curing time after the last spraying is 10-15 h.

In one embodiment of the invention, in the step of coating the coating layer raw material on the glass fiber wires and then winding the glass fiber wires on the outer layer pipe body, when the glass fiber wires are wound with multiple layers on the outer layer pipe body, the winding directions of the adjacent glass fiber wires on the outer layer pipe body are opposite.

In conclusion, the modified polyethylene wear-resistant composite pipe and the forming process thereof disclosed by the invention can effectively solve the problems of lower surface hardness and poorer wear resistance of the common modified polyethylene pipe. Through the dope layer at polyethylene pipe surface coating, methyl silicone resin and silane coupling in the dope layer can effectively reduce the wear rate of body and show improvement and splice intensity. Meanwhile, the wear-resistant steel plate has good hardness and wear resistance. When the glass fiber wire is used as a reinforcing material of reinforced plastics, the tensile strength of the pipe can be effectively improved, and further, the insulativity, the heat resistance, the corrosion resistance and the mechanical strength are enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of a modified polyethylene wear-resistant composite pipe according to an embodiment of the present invention;

fig. 2 is a schematic perspective view illustrating a modified polyethylene wear-resistant composite pipe according to an embodiment of the invention;

fig. 3 is a schematic front view of a modified polyethylene wear-resistant composite pipe according to an embodiment of the invention;

FIG. 4 is a schematic top view of an embodiment of a modified PE abrasion-resistant composite pipe of the present invention;

fig. 5 is a schematic flow chart illustrating a molding process of a modified polyethylene wear-resistant composite pipe according to an embodiment of the present invention.

Description of the element reference numerals

100. A protective layer; 101. a coating layer; 102. glass fiber wires; 200. an outer pipe body; 300. a support layer; 400. an inner tube body.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Please refer to fig. 1 to 5. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure.

Example 1

Referring to fig. 1 to 4, the invention provides a modified polyethylene wear-resistant composite pipe, which can solve the problems of low surface hardness and poor wear resistance of a common modified polyethylene pipe. The modified polyethylene wear-resistant composite pipe can be of a multilayer structure, and the multilayer structure is connected with one another. Specifically, the modified polyethylene abrasion-resistant composite pipe may include an inner pipe body 400, an outer pipe body 200, a support layer 300, and an armor layer 100, wherein the inner pipe body 400, the outer pipe body 200, the support layer 300, and the armor layer 100 are sequentially connected to each other. The modified polyethylene wear-resistant composite pipe is arranged to be of a multilayer structure, so that the hardness and the wear resistance of the surface of the modified polyethylene wear-resistant composite pipe are improved. Wherein, fixed connection is between the inner tube 400 and the outer tube 200, and the inner tube 400 and the outer tube 200 are coaxially disposed. The support layer 300 is positioned between the inner pipe body 400 and the outer pipe body 200, and the structural strength of the modified polyethylene wear-resistant composite pipe can be improved through the support layer 300. In the case of the armor layer 100, which is disposed on the outer surface of the outer pipe, the abrasion resistance of the surface of the outer pipe 200 can be effectively improved by the armor layer 100.

Specifically, the support layer 300 may be provided with at least one layer, which is not limited and may be determined according to actual requirements. For example, the support layer 300 may be provided with 2, 3, or 4 layers. It should be noted that, when the support layers 300 are provided in multiple layers, adjacent support layers 300 are sequentially arranged in a staggered manner, so as to improve the structural strength of the entire support layer 300. The support layer 300 may allow a wire mesh skeleton structure to be used, and the mesh shape of the wire mesh skeleton structure may be diamond, rectangular or circular. Therefore, the steel wire mesh fixing structure is wrapped on the inner layer pipe body 400, so that the structural strength of the modified polyethylene wear-resistant composite pipe can be effectively improved, and the phenomenon that the inner layer pipe body 400 is cracked is avoided.

Specifically, the protective layer 100 is located at the periphery of the outer pipe 200, and the protective layer 100 and the outer pipe 200 are in a close fit state. Specifically, the protective layer 100 may include a paint layer 101 and a fiberglass wire 102, and the fiberglass wire 102 is coated inside the paint layer 101. It should be noted that the glass fiber wires 102 may be wound on the outer tube 200 in multiple layers, and the winding directions of the glass fiber wires 102 on the outer tube 200 in adjacent layers are opposite. For example, the fiberglass threads 102 may be wound around the outer tube 200 in two layers, wherein one layer of fiberglass threads 102 is wound clockwise around the outer tube 200 and the other layer of fiberglass threads 102 is wound counterclockwise around the outer tube 200. Therefore, the density of the glass fiber wires 102 on the outer layer pipe body 200 can be effectively improved by reversely winding the glass fiber wires 102 of the adjacent layers, so that the protection effect of the glass fiber wires 102 is improved. It should be noted that, during the winding process of the glass fiber wire 102, the raw material of the coating layer 101 may be applied on the glass fiber wire 102 in advance, so that the glass fiber wire 102 may be stably bonded to the outer tube 200 through the raw material of the coating layer 101.

Further, during the preparation of the coating layer 101, the components thereof may include methyl silicone resin, a dispersant, a leveling agent, a diluent, a curing agent, a solvent, a silane coupling agent, and a filler. The methyl silicone resin can be allowed to be dissolved in toluene, and the methyl silicone resin can be used as a bonding agent in an environment with the temperature of above 300 ℃ due to the higher content of SiO2 in the methyl silicone resin. Meanwhile, the silane coupling agent can be used for the adhesive bonding of metals and nonmetals in the structural adhesive, and if the silane adhesion promoter is used, the silane adhesion promoter can be condensed with metal oxide or condensed with another silanol, so that silicon atoms are tightly contacted with the surface of an object to be bonded. For example, silane is added into the butyronitrile phenolic structural adhesive as a tackifier, so that the adhesive strength can be obviously improved.

It is noted that, as for the filler, it is permissible to include graphene, graphite, transition metal oxides, composite silicates, rare earth oxides, and metallic materials. Wherein the transition group metal oxide is selected from one or more of chromium oxide, titanium oxide, molybdenum oxide, niobium oxide and zirconium oxide, and the metal material is selected from one or more of nickel, titanium, chromium, manganese, copper and aluminum. However, without being limited thereto, the determination may be allowed according to actual needs.

It should be noted that, for the modified polyethylene wear-resistant composite pipe, the inner pipe body 400 and the outer pipe body 200 are made of modified polyethylene. The inner pipe body 400 and the outer pipe body 200 are prepared by modifying polyethylene material to improve the structural strength of the inner pipe body 400 and the outer pipe body 200 in the actual use process.

Example 2

Referring to fig. 5, the present invention provides a forming process of a modified polyethylene wear-resistant composite pipe according to example 1, which includes:

step S10, preparing basic raw materials required by preparing the composite tube, proportioning the components in the basic raw materials according to parts by mass, and fully stirring and mixing, wherein the basic raw materials comprise: modified polyethylene raw materials and coating layer raw materials.

Specifically, in this example, each component in the modified polyethylene raw material includes, in parts by mass:

60 parts of high-density polyethylene, 15 parts of low-density polyethylene, 5 parts of coupling agent, 1 part of carbon black master batch, 5 parts of filler, 0.1 part of modified white graphene, 0.05 part of antioxidant and 0.5 part of dispersing agent.

It should be noted that, in step S10, the modified white graphene is obtained by selecting white graphene with 6 to 9 layers, soaking the white graphene in a 0.1 to 0.5% surfactant solution for 23 to 27 hours, centrifuging, and vacuum drying.

For carbon black masterbatch, the carbon black masterbatch can allow for the use of carbon black N330. Wherein, the carbon black N330 is the performance of the reinforced modified polyethylene, and can endow the colloidal particles with better tensile property, tear resistance, wear resistance and elasticity. Therefore, the comprehensive performance of the modified polyethylene can be effectively improved.

Meanwhile, in step S10, the coating layer includes the following raw material components in parts by weight:

40 parts of methyl silicone resin, 0.2 part of dispersing agent, 0.2 part of flatting agent, 5 parts of diluting agent, 5 parts of curing agent, 2 parts of solvent, 15 parts of silane coupling agent and 5 parts of filling material. Wherein the mass ratio of the methyl silicone resin to the curing agent is allowed to be (6.5-8): 1.

Step S20, introducing the modified polyethylene raw material into a forming device, and preparing an inner-layer pipe body and an outer-layer pipe body through the forming device.

Step S30, disposing a support layer between the inner tube and the outer tube, and bonding the inner tube and the outer tube.

And step S40, coating the coating raw material on the glass fiber wires and then winding the glass fiber wires on the outer layer pipe body.

And step S50, spraying the coating layer raw materials on the outer-layer pipe body by adopting a spraying process to obtain a coating layer 101 with the thickness of 20-40 microns, and curing at the temperature of 30-35 ℃ for 2-3 h.

By adopting the scheme, the coating layer coated on the surface of the modified polyethylene pipe has good hardness and wear resistance. Meanwhile, when the glass fiber wire is used as a reinforcing material of reinforced plastics, the tensile strength of the pipe can be effectively improved, and the insulativity, the heat resistance, the corrosion resistance and the mechanical strength are enhanced. Finally, the problems of lower surface hardness and poorer abrasion resistance of the common modified polyethylene pipe can be solved.

Examples 3 to 6 provide a molding process of a modified polyethylene wear-resistant composite pipe as described in example 1, which is different from example 2 in that the selection and the amount of each raw material component are shown in table 1.

Comparative example 1, a molding process based on the modified polyethylene abrasion-resistant composite pipe described in example 1, is different from example 2 in that the modified white graphene is used in an amount of 0.

Comparative example 2, a molding process based on the modified polyethylene abrasion resistant composite pipe described in example 1, differs from example 4 in that the amount of methyl silicone resin used is 0.

Comparative example 3, a molding process based on the modified polyethylene abrasion resistant composite pipe described in example 1, is different from example 6 in that the silane coupling agent is used in an amount of 0.

As shown in Table 1, the selection of the feed components and their respective amounts (kg) in examples 2 to 6 and comparative examples 1 to 3 are included in Table 1.

TABLE 1

In summary, the modified polyethylene pipes prepared based on the raw material components in the above examples 2 to 6 and comparative examples 1 to 3 were subjected to shore hardness detection, wear rate detection, and static hydraulic strength detection on the surface layer.

Experimental equipment: static hydraulic pressure intensity check out test set.

According to GB5478-85, the wear rate of the modified polyethylene wear-resistant composite pipe is measured by a Taber wear tester, and the test method specifically comprises the following steps: pressing and cutting the modified polyethylene wear-resistant composite pipe into a plate with the size of 100mmx100mm, forming a hole with the diameter of 6.5mm in the center of the plate, and weighing the weight of the plate, wherein the mark is M1; slowly putting down the grinding wheel and the dust collector, and continuously operating each sample plate for 1000 revolutions at the rotating speed of 60 r/min; after the operation is stopped, wiping off powder impurities by using a cleaning cloth, and weighing the mass M2 of the sample; the mass wear is Mr, M1-M2, and the wear rate is Mr/M1 × 100%. Each group of samples was not less than 5 and averaged.

The test method is as follows according to the Shore hardness test standard in GB/T2411-1980 and through a Shore hardness tester: the modified polyethylene wear-resistant composite tube is placed on a sample platform of a test frame, a pressure needle is at least 12mm away from the edge of the sample, a hardness tester is stably and impact-free pressed on the sample under the action of a specified heavy hammer, and the reading is carried out immediately after the lower pressure plate is completely contacted with the sample for 15 seconds. If instantaneous readings are specified, the lower platen reads within 1 second of full contact with the sample. Each group of samples was not less than 5 and averaged.

Referring to table 2, table 2 shows the results of testing the modified polyethylene pipes of examples 2 to 6 and comparative examples 1 to 3. It includes:

TABLE 2

It can be understood that, combining comparative example 1, comparative example 2 and comparative example 3, it can be seen that, by adding the methyl silicone resin in the coating layer, the wear rate of the pipe body can be effectively reduced and the adhesive strength can be significantly improved. Meanwhile, the actual strength of the pipe can be effectively improved through the silane coupling agent.

In conclusion, the modified polyethylene wear-resistant composite pipe and the forming process thereof disclosed by the invention are used for solving the problems of lower surface hardness and poorer wear resistance of the common modified polyethylene pipe. The polyethylene pipe has good hardness and wear resistance through the coating layer coated on the surface of the polyethylene pipe. When the glass fiber wire is used as a reinforcing material of reinforced plastics, the tensile strength of the pipe can be effectively improved, and further, the insulativity, the heat resistance, the corrosion resistance and the mechanical strength are enhanced. Finally, the problems of lower surface hardness and poorer abrasion resistance of the common modified polyethylene pipe can be solved.

Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Also, when numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and the description of the present invention, and any methods, apparatuses, and materials similar or equivalent to those described in the examples of the present invention may be used to practice the present invention.

Claims

1. The modified polyethylene wear-resistant composite pipe is characterized by comprising the following components:

an inner tubular body (400);

the outer layer pipe body (200) is fixedly connected with the inner layer pipe body (400), and the outer layer pipe body (200) and the inner layer pipe body (400) are coaxially arranged;

a support layer (300) located between the inner tube (400) and the outer tube (200); and

a protective layer (100) located around the outer pipe body (200), the protective layer comprising:

the coating layer (101) is positioned on the outermost side of the outer layer pipe body (200); and

the glass fiber wire (102) is wound on the outer layer pipe body (200), and the glass fiber wire (102) is coated in the coating layer (101);

the glass fiber wires (102) are arranged on the outer layer pipe body (200) in multiple layers, and winding directions of the glass fiber wires (102) on the outer layer pipe body (200) in adjacent layers are opposite.

2. The modified polyethylene wear-resistant composite pipe according to claim 1, wherein the support layer (300) is a steel wire mesh skeleton structure, and the steel wire mesh skeleton structure is provided with at least one layer.

3. The modified polyethylene wear-resistant composite pipe according to claim 1, wherein the inner pipe body (400) and the outer pipe body (200) are made of modified polyethylene, and the modified polyethylene comprises the following raw materials in parts by weight:

60-80 parts of high-density polyethylene, 15-30 parts of low-density polyethylene, 5-30 parts of coupling agent, 1-3 parts of carbon black master batch, 5-40 parts of filler, 0.1-20 parts of modified white graphene, 0.05-10 parts of antioxidant and 0.5-15 parts of dispersing agent.

4. The modified polyethylene wear-resistant composite pipe according to claim 3, wherein the modified white graphene is prepared by soaking white graphene with 6-9 layers in 0.1-0.5% surfactant solution for 23-27 hours, centrifuging and vacuum drying.

5. The modified polyethylene abrasion-resistant composite pipe according to claim 3, wherein the carbon black masterbatch is carbon black N330.

6. The modified polyethylene wear-resistant composite pipe according to claim 1, wherein the coating layer (101) comprises the following raw materials in parts by weight:

40-65 parts of methyl silicone resin, 0.2-1 part of dispersing agent, 0.2-0.6 part of flatting agent, 5-10 parts of diluent, 5-10 parts of curing agent, 2-4 parts of solvent, 15-20 parts of silane coupling agent and 5-10 parts of filler; wherein the mass ratio of the methyl silicone resin to the curing agent is (6.5-8): 1.

7. The modified polyethylene wear-resistant composite pipe according to claim 4, wherein the coating layer (101) comprises the following raw materials in parts by weight:

50 parts of methyl silicone resin, 0.7 part of dispersing agent, 0.4 part of flatting agent, 7 parts of diluting agent, 7 parts of curing agent, 3 parts of solvent, 17 parts of silane coupling agent and 7 parts of filling material; wherein the mass ratio of the methyl silicone resin to the curing agent is 7: 1.

8. The modified polyethylene abrasion-resistant composite pipe according to claim 6 or 7, wherein the filler comprises: graphene, graphite, transition metal oxides, composite silicates, rare earth oxides, and metallic materials; wherein the transition group metal oxide is selected from one or more of chromium oxide, titanium oxide, molybdenum oxide, niobium oxide and zirconium oxide, and the metal material is selected from one or more of nickel, titanium, chromium, manganese, copper and aluminum.

9. A molding process of the modified polyethylene wear-resistant composite pipe as claimed in any one of claims 1 to 6, comprising:

step S20, introducing the modified polyethylene raw material into a forming device, and preparing an inner layer pipe body (400) and an outer layer pipe body (200) through the forming device;

step S30 of disposing a support layer (300) between the inner tube (200) and the outer tube (200), and bonding the inner tube (400) and the outer tube (200);

step S40, coating the raw material of the coating layer on the glass fiber wire (102) and then winding the glass fiber wire on the outer layer pipe body (200);

s50, spraying the coating layer raw material on the outer layer pipe body (200) by adopting a spraying process to obtain a coating layer (101) with the thickness of 20-40 microns, and curing at the temperature of 30-35 ℃ for 2-3 hours;

and S60, repeating the step S50 to ensure that the total thickness of the coating layer (101) is 100-200 mu m, wherein the curing time after the last spraying is 10-15 h.

10. The forming process of the modified polyethylene wear-resistant composite pipe according to claim 9, wherein in the step of coating the raw material of the coating layer on the glass fiber wires (102) and then winding the glass fiber wires (102) on the outer pipe body (200), when the glass fiber wires (102) are wound on the outer pipe body (200) in multiple layers, the winding directions of the adjacent glass fiber wires (102) on the outer pipe body (200) are opposite.