Modified nylon material for steel skeleton reinforced nylon pipeline and preparation method of modified nylon material

Abstract

The invention discloses a modified nylon material for a steel skeleton reinforced nylon pipeline and a preparation method of the modified nylon material, and relates to the field of nylon pipelines, the modified nylon material is characterized by comprising polyamide, modified polyamide and a modified polyamide film according to a mass ratio of 8: 3: 1, the modified polyamide is subjected to acid etching after polyamide melt extrusion, and the modified polyamide film is subjected to acid etching after polyamide melt extrusion. The preparation method comprises the following steps: carrying out acid etching, carrying out hydrophilic group modification, carrying out polyamide hydrophilic group modification on a modified polyamide film, extruding modified polyamide particles to prepare a film, and preparing a modified polyamide film covered with a silicon coating by using triethoxysilane; the polyamide subjected to acid etching and modification serves as a connecting medium of polyamide and a steel framework, the steel framework is filled and covered with the modified polyamide film, the combination compactness of a nylon material and a steel material is overall improved, the overall bending resistance is improved, meanwhile, the modified polyamide film is adopted for the inner wall, hydrophobicity is improved, and the service life of the nylon material is prolonged. And friction with fluid is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nylon pipes, in particular to a modified nylon material for a steel skeleton reinforced nylon pipe and a preparation method thereof. Background Art

[0002] Nylon pipes have gradually replaced steel pipes and are widely used in pipelines in many industries such as electricity, metallurgy, coal, petroleum, chemical industry, building materials, machinery, etc. due to their strong resistance to high and low temperatures, excellent corrosion resistance and wear resistance, as well as their advantages of easy installation and high transportation efficiency. However, since each unit pipe that makes up the pipeline is generally more than ten meters long, and nylon is a plastic material, the pipeline is relatively flexible and lacks rigidity. Especially when transporting materials with a large specific gravity, the pipeline's ability to resist internal pressure is significantly weak, its strength is poor, and its deformation is serious. In order to solve the above problems, people have enhanced the pipeline's pressure resistance and extended its service life by embedding metal frames or wire mesh in the nylon pipe wall. The rebar is woven into a metal skeleton in the shape of a warp and weft mesh tube and embedded in the middle of the nylon tube. The nylon polymer is coated on the metal skeleton of the rebar. Such nylon pipes not only have the advantages of stable chemical properties, acid and alkali resistance, low temperature resistance, corrosion resistance, and aging resistance, but also have the characteristics of close integration of the steel skeleton and the pipe matrix material, high density, strong impact resistance, high internal pressure resistance, and strong ability to resist deformation. Therefore, they are favored and expected by many users. In particular, the nylon material used as the main part of the pipeline must have specific properties, so the components and contents of the various substances constituting the nylon material should meet specific requirements. At the same time, the bonding degree between the nylon material and the steel wire of the steel skeleton is also an important indicator of the steel skeleton nylon pipeline. In the transportation of sewage, if the inner wall is easily adhered to dirt and too much dirt accumulates on the inner wall for a long time, it will affect the transportation volume of the sewage. For this reason, the present invention designs a nylon material of modified polyamide to enhance the bonding degree between the steel wires and improve the actual functional performance of the pipeline, while improving the hydrophobicity and wear resistance of the inner wall of the nylon pipeline. Summary of the invention

[0003] The purpose of the present invention is to provide a nylon pipe reinforced with a steel frame, which uses acid-etched and modified polyamide as a connecting medium between polyamide and a steel frame, and combines the modified polyamide film to fill and cover the steel frame, thereby greatly improving the overall bonding tightness between the nylon material and the steel material and improving the overall anti-bending performance. At the same time, the inner wall adopts the modified polyamide film, and its hydrophobicity is improved due to the silicon oxide ions on its surface, while reducing the adhesion with sewage when the pipe is used, thereby facilitating the passage of internal sewage.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A modified nylon material for a steel skeleton reinforced nylon pipe, the modified nylon material comprising polyamide, modified polyamide and modified polyamide film in a mass ratio of 8:3:1, the modified polyamide is prepared by extruding the polyamide into a cylindrical shape through melt extrusion, and then acid etching is performed, and hydrophilic groups are modified after acid etching, the modified polyamide film is prepared by extruding modified polyamide particles after the hydrophilic groups of the polyamide are modified, and then a silicon coating is prepared by using triethoxysilane to prepare the modified polyamide film.

[0006] As a preferred embodiment of the present invention, the modified polyamide comprises polyamide, formic acid, dispersant and adhesive, and the mass ratio thereof is 20 polyamide: 2-6 formic acid: 30 dispersant: 5 adhesive, wherein the dispersant is ethylene glycol and the adhesive is a high-viscosity polyester resin.

[0007] As a preferred embodiment of the present invention, the modified polyamide film further comprises auxiliary materials of deionized water, ethanol, acetone, hexane, a borane-anhydrous tetrahydrofuran mixture and corundum particles.

[0008] As a preferred embodiment of the present invention, the mass ratio of the triethoxysilane to the modified polyamide film is 1-3:20.

[0009] As a preferred embodiment of the present invention, the mass ratio of the deionized water, ethanol, acetone, hexane, borane-anhydrous tetrahydrofuran mixture and the corundum particle mixture is 3:3:3:3:3:1, and the deionized water completely immerses the mixture of triethoxysilane and modified polyamide film.

[0010] The present invention also provides a method for preparing a modified nylon material for a steel skeleton reinforced nylon pipeline, using the modified nylon material for a steel skeleton reinforced nylon pipeline, comprising the following steps:

[0011] ①. The polyamide is melted into a paste-like nylon material in the extruder for use;

[0012] ② Selecting half of the above-mentioned paste-like polyamide to prepare modified polyamide;

[0013] ③. Preparation of modified polyamide film;

[0014] ④ The above step ① in the paste-like polyamide extrusion embryo nylon pipe preparation;

[0015] ⑤. Evenly coat the inner wall of the embryonic pipe with a paste-like modified polyamide with a thickness of 1 / 10 of the thickness of the embryonic nylon pipe;

[0016] ⑥. The steel skeleton warp and steel skeleton weft are braided into a mesh steel skeleton in the mold cavity by the braiding mechanism of the pipeline manufacturing machine, and the above-mentioned embryonic nylon pipe is unfolded on the side along the axial direction and then covered with the mesh steel skeleton;

[0017] ⑦. Press the mesh steel skeleton to ensure that it is completely pressed into the modified polyamide;

[0018] ⑧. Coating an adhesive on one side of the modified polyamide film, and covering the modified polyamide film on the outside of the mesh steel skeleton, wherein the adhesive side is in contact with the mesh steel skeleton;

[0019] ⑨. After drying, cutting off the inner and outer protrusions and grinding, the steel skeleton reinforced nylon pipe is obtained.

[0020] As a preferred embodiment of the present invention, the specific steps of step ② include:

[0021] S21. The polyamide paste is immersed in the ethylene glycol solution, and the ethylene glycol solution completely covers the polyamide paste; while adding a corresponding mass specific gravity of formic acid to the ethylene glycol solution;

[0022] S22. During immersion, the external temperature is 30°C-60°C and the holding time is 30 minutes;

[0023] S23. After the immersion is completed, the outside of the polyamide paste is rinsed with deionized water, and a polyester resin is applied to the outside of the polyamide paste, so that the polyester resin completely covers the polyamide paste to obtain a modified polyamide.

[0024] As a preferred embodiment of the present invention, the specific steps of step ③ include:

[0025] S31. The modified polyamide paste is dried and granulated, and then extruded and film-formed, and corundum particles are added internally in the granulation process relative to the mass ratio;

[0026] S32. The modified polyamide film in step S31 is rinsed with deionized water, ethanol, acetone, and hexane in sequence, and dried after rinsing;

[0027] S33. Triethoxysilane was added to the film to carry out N-alkylation reaction. The reaction mixture was stirred at room temperature for 2 h, and then borane-anhydrous tetrahydrofuran was added after stirring. The temperature was raised to 60 ° C. and stirring was maintained for 5 h.

[0028] S34. After the stirring is completed, the film sample is cleaned again with borane-anhydrous tetrahydrofuran and ethanol. After the cleaning is completed, it is soaked in deionized water overnight;

[0029] S35. After taking out, rinse again with deionized water, ethanol, acetone, and hexane in sequence, put into a drying oven, dry for 28 hours, maintain the temperature at 60°C, and take out to obtain a modified polyamide film with silicon oxide ions deposited on the surface of the polyamide film.

[0030] In summary, the beneficial technical effects of the present invention are as follows: the present invention utilizes acid-etched and modified polyamide as a connecting medium between polyamide and steel skeleton, and combines the modified polyamide film to fill and cover the steel skeleton, which greatly improves the overall bonding tightness between nylon material and steel material, and improves the overall anti-bending performance. At the same time, the inner wall adopts the modified polyamide film. Due to the silicon oxide ions on its surface, its hydrophobicity is improved, and at the same time, it reduces the adhesion with sewage when the pipeline is used, which facilitates the passage of internal sewage. At the same time, the modified polyamide film is in contact with sewage. Due to the addition of corundum particles, the wear resistance of the surface is improved, and combined with the improvement of its hydrophobicity, it can reduce fluid friction and improve the wear resistance of internal fixtures and the inner wall of the pipeline when sewage passes through, thereby extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is a scanning electron microscope schematic diagram of a modified polyamic acid etching of a modified nylon material for a steel skeleton reinforced nylon pipeline in this embodiment;

[0033] Figure 2 This is a schematic diagram of the energy spectrum of a modified polyamide film of a modified nylon material for a steel skeleton reinforced nylon pipeline in this embodiment;

[0034] Figure 3 This is a schematic diagram of the deposition reaction mechanism of a modified polyamide film of a modified nylon material for a steel skeleton reinforced nylon pipe in this embodiment.

[0035] In the figure, 1. nylon pipe machine body; 2. drain pipe; 3. outlet pipe; 4. recovery box; 5. connecting pipe; 6. partition plate; 7. filter plate; 8. push plate; 9. first cylinder; 10. drain pipe; 11. cover plate; 12. slide groove; 13. pulley; 14. bracket; 15. support rod; 16. collection slide rail; 17. slider; 18. baffle; 19. connecting rod; 20. piston rod; 21. second cylinder. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-3 The present invention provides a technical solution: a modified nylon material for a steel skeleton reinforced nylon pipe, the modified nylon material comprising polyamide, modified polyamide and modified polyamide film in a mass ratio of 8:3:1, the modified polyamide is based on polyamide melt extrusion into a cylindrical shape and then acid etching is performed, and the hydrophilic group is modified after the acid etching, the modified polyamide film is based on the polyamide hydrophilic group modification, the modified polyamide film is prepared by extruding the modified polyamide particles, and the modified polyamide film covered with a silicon coating is prepared by using triethoxysilane.

[0039] The modified polyamide includes polyamide, formic acid, dispersant and adhesive, and the mass ratio is polyamide 20: formic acid 2-6: dispersant 30: adhesive 5, wherein the dispersant is ethylene glycol and the adhesive is high-viscosity polyester resin.

[0040] The modified polyamide film also includes auxiliary materials such as deionized water, ethanol, acetone, hexane, a borane-anhydrous tetrahydrofuran mixture and corundum particles.

[0041] Wherein, the mass ratio of triethoxysilane to modified polyamide film is 1-3:20.

[0042] The mass ratio of deionized water, ethanol, acetone, hexane, borane-anhydrous tetrahydrofuran mixture and corundum particle mixture is 3:3:3:3:3:1, and the deionized water completely immerses the mixture of triethoxysilane and modified polyamide film.

[0043] The method for preparing the modified nylon material for steel skeleton reinforced nylon pipeline adopts the modified nylon material for steel skeleton reinforced nylon pipeline and comprises the following steps:

[0044] ①. The polyamide is melted into a paste-like nylon material in the extruder for standby use;

[0045] ② Selecting half of the above-mentioned paste-like polyamide to prepare modified polyamide;

[0046] ③. Preparation of modified polyamide film;

[0047] ④ The above step ① in the paste-like polyamide extrusion preparation of embryonic nylon pipe;

[0048] ⑤. Evenly coat the inner wall of the embryonic pipe with a paste-like modified polyamide with a thickness of 1 / 10 of the thickness of the embryonic nylon pipe;

[0049] ⑥. The steel skeleton warp and steel skeleton weft are braided into a mesh steel skeleton in the mold cavity by the braiding mechanism of the pipeline manufacturing machine, and the above-mentioned embryonic nylon pipe is unfolded on the side along the axial direction and then covered with the mesh steel skeleton;

[0050] ⑦. Press the mesh steel skeleton to ensure that it is completely pressed into the modified polyamide;

[0051] ⑧. Coating an adhesive on one side of the modified polyamide film, and covering the modified polyamide film on the outside of the mesh steel skeleton, wherein the adhesive side is in contact with the mesh steel skeleton;

[0052] ⑨. After drying, cutting off the inner and outer protrusions and grinding, the steel skeleton reinforced nylon pipe is obtained.

[0053] The specific steps of step ② include:

[0054] S21. The polyamide paste is immersed in the ethylene glycol solution, and the ethylene glycol solution completely covers the polyamide paste; while adding a corresponding mass specific gravity of formic acid to the ethylene glycol solution;

[0055] S22. During immersion, the external temperature is 30°C-60°C and the holding time is 30 minutes;

[0056] S23. After the immersion is completed, the outside of the polyamide paste is rinsed with deionized water, and a polyester resin is applied to the outside of the polyamide paste, so that the polyester resin completely covers the polyamide paste to obtain a modified polyamide.

[0057] The specific steps of step ③ include:

[0058] S31. The modified polyamide paste is dried and granulated, and then extruded and film-formed, and corundum particles are added internally in the granulation process relative to the mass ratio;

[0059] S32. The modified polyamide film in step S31 is rinsed with deionized water, ethanol, acetone, and hexane in sequence, and dried after rinsing;

[0060] S33. Triethoxysilane was added to the film to carry out N-alkylation reaction. The reaction mixture was stirred at room temperature for 2 h, and then borane-anhydrous tetrahydrofuran was added after stirring. The temperature was raised to 60 ° C. and stirring was maintained for 5 h.

[0061] S34. After the stirring is completed, the film sample is cleaned again with borane-anhydrous tetrahydrofuran and ethanol. After the cleaning is completed, it is soaked in deionized water overnight;

[0062] S35. After taking out, rinse again with deionized water, ethanol, acetone, and hexane in sequence, put into a drying oven, dry for 28 hours, maintain the temperature at 60°C, and take out to obtain a modified polyamide film with silicon oxide ions deposited on the surface of the polyamide film.

[0063] Example 1

[0064] Follow the steps below to prepare the steel skeleton reinforced nylon pipe product:

[0065] ①. The polyamide is melted into a paste-like nylon material in the extruder for use;

[0066] ② Selecting half of the above-mentioned paste-like polyamide to prepare a modified polyamide, wherein the mass of the selected polyamide is 100g, and formic acid is added in a mass ratio of 20:2;

[0067] ③. The modified polyamide film is prepared by the preparation method of the present invention, wherein the mass ratio of triethoxysilane to the modified polyamide film is 1-10;

[0068] ④ The above step ① in the paste-like polyamide extrusion embryo nylon pipe preparation;

[0069] ⑤. Evenly coat the inner wall of the embryonic pipe with a paste-like modified polyamide with a thickness of 1 / 10 of the thickness of the embryonic nylon pipe;

[0070] ⑥. The steel skeleton warp and steel skeleton weft are braided into a mesh steel skeleton in the mold cavity by the braiding mechanism of the pipeline manufacturing machine, and the above-mentioned embryonic nylon pipe is unfolded on the side along the axial direction and then covered with the mesh steel skeleton;

[0071] ⑦. Press the mesh steel skeleton to ensure that it is completely pressed into the modified polyamide;

[0072] ⑧. Coating an adhesive on one side of the modified polyamide film, and covering the modified polyamide film on the outside of the mesh steel skeleton, wherein the adhesive side is in contact with the mesh steel skeleton;

[0073] ⑨. After drying, cutting off the inner and outer protrusions and grinding, the steel skeleton reinforced nylon pipe is obtained.

[0074] Example 2-3

[0075] The difference between Example 2-3 and Example 1 is that the mass ratios of polyamide to formic acid are different, which are 20:4 and 20:6 respectively.

[0076] In the above embodiment, the polyamide is firstly subjected to acid etching to change the roughness of the polyamide surface. In this embodiment, different formic acid mass ratios are selected to obtain different surface roughnesses. Specifically, under the viewing angle of a scanner, the roughness data of Embodiments 1-3 are obtained as shown in Table 1 below:

[0077] Quality Ratio Temperature(℃) Time (min) Geometric roughness (μm) 2 50 30 20.12 4 50 30 23.36 5 50 30 22,51

[0078] Table 1 Roughness of formic acid etching at different mass ratios

[0079] The results show the effect of formic acid on the geometric roughness in a mass ratio of 2-6 to polyamide. It can be seen from Table 1 that the geometric roughness value increases with the increase of treatment time. In addition, it can be seen that the geometric roughness value reaches the maximum value at a ratio of 4 and gradually decreases at a ratio of 6. Therefore, formic acid treatment leads to an increase in surface roughness, and the optimal treatment conditions are achieved at a ratio of 4.

[0080] When the roughness of the polyamide slurry surface increases, the surface shows alternating ridges and depressions and the presence of gullies, such as Figure 1 As shown, after acid etching, a large amount of amino ions are acid-lyzed on the surface, thereby increasing the hydrophilicity of the surface. Combined with the adhesive, the adhesive, the modified polyamide and the steel skeleton can be firmly connected. According to the data in Table 2, the pipe in this embodiment has better anti-bending performance, and the gap at the fracture is much smaller than that of the conventional steel skeleton reinforced nylon pipe, thereby further increasing the adhesion performance.

[0081] Further, based on the condition that the mass ratio of formic acid to polyamide is 20:4, that is, Example 2, the pipe prepared in this example and the conventional steel skeleton reinforced nylon pipe are used as comparisons, marked as Conventional Example 1, a 50 cm pipe section is cut, and the two ends are clamped and then a bending tensile testing machine is used to perform a bending test on both, and the complete rupture time and the separation gap between the steel skeleton and the nylon at the crack are counted, wherein the separation gap is the largest gap data at the fracture crack, and the following Table 2 is obtained:

[0082] Time (min) Clearance(mm) Example 2 6 2 Conventional Example 1 13 0.6

[0083] Table 2 Fracture data of embodiment and conventional example

[0084] At the same time, since the corundum particles in Examples 1-3 were selected and added in the same amount, the corundum mixed with the modified polyamide particles after the granulation process of Example 1 were selected for comparative test, wherein Comparative Example 1 was the modified polyamide particles in Example 1, and Comparative Example 2 was conventional polyamide particles. Equal weights of 50 g were selected and sequentially put into the same particle grinder, and the time when the core-shell of the particles were broken was compared, and Table 3 was obtained:

[0085] Examples Grinding time (h) Example 1 1322 Comparative Example 1 703 Comparative Example 2 655

[0086] Table 3: Grinding test data

[0087] Therefore, it can be seen from the data in Table 3 above that the wear resistance of the modified polyamide reinforced with corundum particles in Example 1 is greatly improved, while the modification does not have any relevant improvement on the wear resistance of the polyamide.

[0088] In this embodiment, silicon oxide ions are grown and attached to a polyamide film based on a vapor deposition method. Specifically, the film sample is placed on a sample holder in a vapor deposition reaction vessel, and then flushed with nitrogen, the reaction vessel is purged with nitrogen and evacuated. The reaction vessel is then opened, and after the required number of cycles is completed, the substrate is taken out of the circulation system, rinsed with ethanol and deionized water, and then dried to obtain a surface containing silicon oxide ions. At the same time, the borane-anhydrous tetrahydrofuran in the above-mentioned method acts as an oxidant to reduce the film and remove the residual acidic groups on the surface. The reaction mechanism is as follows: Figure 3 As shown, Figure 2 As shown, it indicates that there are silicon oxide ions on the surface of the modified polyamide film.

[0089] The surface of the film deposited with silicon oxide ions contains silicon oxide ions, which improves the hydrophobicity of the film surface. At the same time, since the surface contains reduced amino groups, when it is combined with the subsequent adhesive, it combines with hydrophilic groups such as carboxyl groups on the surface of the adhesive, thereby increasing the stability of its bonding with the adhesive.

[0090] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0091] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modified nylon material for steel skeleton reinforced nylon pipe, characterized in that: The modified nylon material comprises polyamide, modified polyamide and modified polyamide film in a mass ratio of 8:3:

1. The modified polyamide is prepared by extruding the polyamide into a cylindrical shape through melt extrusion and then acid etching. After the acid etching, the hydrophilic group is modified. The modified polyamide film is prepared by extruding modified polyamide particles after the hydrophilic group of the polyamide is modified, and then a silicon coating-covered modified polyamide film is prepared by using triethoxysilane.

2. The modified nylon material for steel skeleton reinforced nylon pipe according to claim 1, characterized in that: The modified polyamide comprises polyamide, formic acid, dispersant and adhesive, and the mass ratio thereof is 20 polyamide: 2-6 formic acid: 30 dispersant: 5 adhesive, wherein the dispersant is ethylene glycol and the adhesive is a high-viscosity polyester resin.

3. The modified nylon material for steel skeleton reinforced nylon pipe according to claim 1, characterized in that: The modified polyamide film also includes auxiliary materials such as deionized water, ethanol, acetone, hexane, a borane-anhydrous tetrahydrofuran mixture and corundum particles.

4. The modified nylon material for steel skeleton reinforced nylon pipe according to claim 3, characterized in that: The mass ratio of the triethoxysilane to the modified polyamide film is 1-3:

20.

5. The modified nylon material for steel skeleton reinforced nylon pipe according to claim 4, characterized in that: The mass ratio of the deionized water, ethanol, acetone, hexane, borane-anhydrous tetrahydrofuran mixture and the corundum particle mixture is 3:3:3:3:3:1, and the deionized water completely immerses the mixture of triethoxysilane and modified polyamide film.

6. A method for preparing a modified nylon material for a steel skeleton reinforced nylon pipe, using the modified nylon material for a steel skeleton reinforced nylon pipe according to claim 1, characterized in that: The following steps are involved: ①. The polyamide is melted into a paste-like nylon material in the extruder for use; ② Selecting half of the above-mentioned paste-like polyamide to prepare modified polyamide; ③. Preparation of modified polyamide film; ④ The above step ① in the paste-like polyamide extrusion embryo nylon pipe preparation; ⑤. Evenly coat the inner wall of the embryonic pipe with a paste-like modified polyamide with a thickness of 1 / 10 of the thickness of the embryonic nylon pipe; ⑥. The steel skeleton warp and steel skeleton weft are braided into a mesh steel skeleton in the mold cavity by the braiding mechanism of the pipeline manufacturing machine, and the above-mentioned embryonic nylon pipe is unfolded on the side along the axial direction and then covered with the mesh steel skeleton; ⑦. Press the mesh steel skeleton to ensure that it is completely pressed into the modified polyamide; ⑧. Coating an adhesive on one side of the modified polyamide film, and covering the modified polyamide film on the outside of the mesh steel skeleton, wherein the adhesive side is in contact with the mesh steel skeleton; ⑨. After drying, cutting off the inner and outer protrusions and grinding, the steel skeleton reinforced nylon pipe is obtained.

7. The modified nylon material for steel skeleton reinforced nylon pipe according to claim 6, characterized in that: The specific steps of step ② include: S21. The polyamide paste is immersed in the ethylene glycol solution, and the ethylene glycol solution completely covers the polyamide paste; while adding a corresponding mass specific gravity of formic acid to the ethylene glycol solution; S22. During immersion, the external temperature is 30°C-60°C and the holding time is 30 minutes; S23. After the immersion is completed, the outside of the polyamide paste is rinsed with deionized water, and a polyester resin is applied to the outside of the polyamide paste, so that the polyester resin completely covers the polyamide paste to obtain a modified polyamide.

8. The modified nylon material for steel skeleton reinforced nylon pipe according to claim 6, characterized in that: The specific steps of step ③ include: S31. The modified polyamide paste is dried and granulated, and then extruded and film-formed, and corundum particles are added internally in the granulation process relative to the mass ratio; S32. The modified polyamide film in step S31 is rinsed with deionized water, ethanol, acetone, and hexane in sequence, and dried after rinsing; S33. Triethoxysilane was added to the film to carry out N-alkylation reaction. The reaction mixture was stirred at room temperature for 2 h, and then borane-anhydrous tetrahydrofuran was added after stirring. The temperature was raised to 60 ° C. and stirring was maintained for 5 h. S34. After the stirring is completed, the film sample is cleaned again with borane-anhydrous tetrahydrofuran and ethanol. After the cleaning is completed, it is soaked in deionized water overnight; S35. After taking out, rinse again with deionized water, ethanol, acetone, and hexane in sequence, put into a drying oven, dry for 28 hours, maintain the temperature at 60°C, and take out to obtain a modified polyamide film with silicon oxide ions deposited on the surface of the polyamide film.

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