Corrosion-resistant glass reinforced plastic pipe and preparation process thereof

Abstract

The invention provides a corrosion-resistant glass reinforced plastic pipe and a preparation process thereof, and belongs to the field of glass reinforced plastic. The high-temperature-resistant composite material is prepared from the following raw materials: boron phenolic resin, epoxy vinyl ester resin, a high-temperature-resistant additive, modified montmorillonite, a fluxing agent, garnet micro powder, a flame retardant, mica powder, glass fibers, PBO fibers, ethylenediamine and absolute ethyl alcohol. The preparation method comprises the following steps: dissolving zirconium oxychloride octahydrate in absolute ethyl alcohol, adding acetylacetone, carrying out chelation reaction on ketone groups and zirconium ions to form a stable hexa-coordinated complex, inhibiting hydrolysis, adding diphenyldimethoxysilane and 3-(triethoxysilyl) propyl methacrylate, and carrying out a reaction, so as to obtain the high-temperature-resistant anti-ultraviolet coating. After the Si-O-Zr bond-containing high-temperature-resistant additive is added into boron phenolic resin and the glass reinforced plastic pipe is prepared, escape of a resin thermal decomposition product can be effectively inhibited, and the high-temperature resistance of the glass reinforced plastic pipe is further improved.

Description

Technical Field

[0001] The invention relates to the field of glass fiber reinforced plastics, and in particular to a corrosion-resistant glass fiber reinforced plastic pipe and a preparation process thereof. Background Art

[0002] FRP pipe is a lightweight, high-strength, corrosion-resistant non-metallic pipe. It is generally made of unsaturated polyester, epoxy resin and phenolic resin as the matrix, glass fiber as the reinforcing material, and is made through a special process. It is leak-proof, light weight, high strength, long service life, strong designability, low fluid resistance, and easy installation. It is widely used in petroleum, chemical, pharmaceutical, electric power, papermaking, urban water supply and drainage, factory sewage treatment, seawater desalination, gas transmission, mining and other industries. It is an ideal pipeline for transporting liquids and gases.

[0003] Traditional FRP pipes are mainly made of epoxy resin or unsaturated polyester resin as the matrix and are prepared by glass fiber reinforcement. However, the heat deformation temperature of epoxy resin and unsaturated polyester resin is usually lower than 100°C, and they are prone to softening and a sharp drop in mechanical properties under high temperature conditions. Although phenolic resin has a high carbon residue rate and low production cost, it is easy to crack at high temperatures, resulting in a loose and porous carbon layer, which further accelerates the oxidative cracking of the internal structure of the material, and easily causes damage to the internal structure of the material, which limits its application in high-temperature pipelines.

[0004] In addition, traditional FRP pipes have poor tolerance to strong oxidizing acids (such as nitric acid and chromic acid) and strong alkalis. Long-term exposure to corrosive media can easily lead to problems such as resin swelling and fiber debonding. Although phenolic resin FRP has good tolerance to non-oxidizing acids, it is prone to hydrolysis in alkaline environments, which limits its application in pipelines transporting highly corrosive media.

[0005] Therefore, it is necessary to propose a corrosion-resistant glass fiber reinforced plastic pipe with good high temperature resistance and a preparation process thereof. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a corrosion-resistant glass fiber reinforced plastic pipe and a preparation process thereof.

[0007] A preparation process of a corrosion-resistant glass fiber reinforced plastic pipe comprises the following steps: S1: adding boron phenolic resin, epoxy vinyl ester resin, high temperature resistant additive, flux, modified montmorillonite, garnet powder, flame retardant and mica powder into a disperser, and uniformly mixing to obtain a mixed material; S2: Ethylenediamine and anhydrous ethanol are fully stirred and mixed, and then glass fiber and PBO fiber modified by silane coupling agent are added and uniformly dispersed to obtain a mixed dispersion; S3: Add the above-mentioned mixed materials into the above-mentioned mixed dispersion liquid, stir and disperse them in a vacuum and airtight condition for 30 - 40 min, then inject them into a preheated mold, rotate at 400 - 500 r / min and 140 - 160 °C for 40 - 50 min, and obtain a glass steel pipe through demolding, trimming and edging.

[0008] Further, the preparation steps of the modified montmorillonite are as follows: A1: Add organophilic montmorillonite and tetrabutyl titanate into xylene according to the mass ratio of (2 - 3):1:(3.3 - 3.5), fully stir and mix to obtain a mixed suspension; A2: Add urushiol into the above-mentioned mixed suspension, heat and stir for reaction at 70 - 80 °C for 1 - 2 h, then heat and stir at 110 - 120 °C for 2 - 3 h, and finally heat and stir at 135 - 140 °C for 1 - 2 h. After cooling, obtain the modified montmorillonite, wherein the mass ratio of urushiol to tetrabutyl titanate is (1.8 - 2):1.

[0009] Further, the preparation steps of the organophilic montmorillonite are as follows: Disperse montmorillonite in deionized water according to the solid-liquid ratio of 1 g:(10 - 20) mL, perform ultrasonic treatment for 1 - 2 h to obtain a montmorillonite suspension. Subsequently, dissolve cetyltrimethylammonium bromide in an 80% ethanol solution according to the solid-liquid ratio of 1 g:(8 - 10) mL to prepare a cetyltrimethylammonium bromide solution, then drop it into the montmorillonite suspension, and then heat and stir at 75 - 85 °C for 4 - 5 h. After filtration, washing and vacuum drying, obtain the organophilic montmorillonite, wherein the mass ratio of cetyltrimethylammonium bromide to montmorillonite is (1 - 2):1.

[0010] Further, the preparation steps of the high-temperature resistant additive are as follows: B1: Add ZrOCl₂·8H₂O into absolute ethanol, fully stir and dissolve it, then add acetylacetone and stir for reaction for 1 - 2 h to obtain a mixed solution, wherein the molar ratio of ZrOCl₂·8H₂O to absolute ethanol is 1:(25 - 30), and the molar ratio of acetylacetone to ZrOCl₂·8H₂O is 1:1; B2: Add diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate into the above-mentioned mixed solution, heat and stir for reaction at 70 - 80 °C for 2 - 3 h, and perform rotary evaporation at 100 °C for 15 - 20 min to obtain the high-temperature resistant additive.

[0011] Further, the molar ratio of diphenyldimethoxysilane to 3-(triethoxysilyl)propyl methacrylate is (1.8 - 2.2):1, and the molar ratio of diphenyldimethoxysilane to ZrOCl₂·8H₂O is (6.5 - 7):1.

[0012] Further, by mass, the raw material composition of the glass steel pipe is: 30-40 parts of boron phenolic resin, 10-20 parts of epoxy vinyl ester resin, 10-20 parts of high-temperature resistant additive, 12-16 parts of modified montmorillonite, 15-25 parts of flux, 5-15 parts of garnet micropowder, 2-3 parts of flame retardant, 6-8 parts of mica powder, 35-45 parts of glass fiber, 1-3 parts of PBO fiber, 20-30 parts of ethylenediamine, and 15-25 parts of absolute ethanol; wherein, the flame retardant is any one of ammonium metaphosphate and zinc borate, and the flux is any one of alumina, magnesia or aluminum hydroxide.

[0013] Further, the main component content of the garnet micropowder is: 36-40wt% SiO2, 20-24wt% Al2O3, 22-24wt% FeO, 8-13wt% MgO, 6-9wt% CaO, 4-6wt% Fe2O3, 0-0.5wt% TiO2, and 0-0.5wt% MnO.

[0014] Further, the structural formula of the epoxy vinyl ester resin is: .

[0015] Further, a corrosion-resistant glass steel pipe is prepared by the preparation process of a corrosion-resistant glass steel pipe described in any one of the above.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: 1. In the present invention, by first dissolving zirconium oxychloride octahydrate in absolute ethanol and then adding acetylacetone, the keto group reacts with zirconium ions to form a stable six-coordinate complex, inhibiting hydrolysis. Then, diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate are added for reaction to prepare a high-temperature resistant additive containing Si-O-Zr bonds. After adding it to the boron phenolic resin and making a glass steel pipe, the high-temperature resistant additive can be ceramized to generate a Zr-Si-O glass phase covering the surface of the carbon layer. At the same time, a three-dimensional high-temperature resistant framework is formed through cross-linking of Si-O-Zr bonds, which can effectively inhibit the escape of resin thermal decomposition products, thereby improving the high-temperature resistance of the glass steel pipe.

[0017] 2. In the present invention, organic montmorillonite is first prepared using cetyltrimethylammonium bromide as an intercalating agent. Then, the organic montmorillonite and tetrabutyl titanate are dispersed in xylene, and the titanium-oxygen bond of tetrabutyl titanate reacts with the surface hydroxyl groups of the organic montmorillonite to form Ti-O-Si bonds. Subsequently, urushiol is added for reaction, and the phenolic hydroxyl group of urushiol undergoes an esterification reaction with tetrabutyl titanate to form modified montmorillonite with a stable organic-inorganic hybrid structure. After adding it to the boron phenolic resin to make a glass fiber-reinforced plastic pipe, the modified montmorillonite has a tortuous and complex path, which can form a labyrinth effect and extend the penetration path of the corrosive medium, thereby effectively improving the acid and alkali corrosion resistance of the glass fiber-reinforced plastic pipe.

[0018] 3. In the present invention, when preparing a glass fiber-reinforced plastic pipe by combining PBO fibers and garnet micropowders, on the one hand, at high temperatures, the PBO fibers maintain the structural integrity, and the garnet micropowders delay the carbonization of the resin by absorbing heat and insulating, forming a double-layer thermal protection layer to further improve the high-temperature resistance of the glass fiber-reinforced plastic pipe. On the other hand, the PBO fibers themselves have self-flame retardant properties, and the carbonized layer formed at high temperatures and the barrier effect of the garnet micropowders synergistically form a dense thermal barrier, thereby further improving the flame retardant performance of the glass fiber-reinforced plastic pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0020] Figure 1 It is the TEM image of the modified montmorillonite prepared in Example 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following describes in detail a corrosion-resistant glass fiber-reinforced plastic pipe and its preparation process provided by the present invention with reference to the drawings and specific embodiments.

[0022] Example 1 A preparation process of a corrosion-resistant glass fiber-reinforced plastic pipe includes the following steps: Preparation of organic montmorillonite: Montmorillonite is dispersed in deionized water according to a solid-liquid ratio of 1 g:10 mL, and ultrasonic treatment is carried out for 1 h to obtain a montmorillonite suspension. Subsequently, cetyltrimethylammonium bromide is dissolved in an 80% ethanol solution according to a solid-liquid ratio of 1 g:8 mL to prepare a cetyltrimethylammonium bromide solution, which is then dropped into the montmorillonite suspension, and then heated and stirred at 75 °C for 4 h. After filtration, washing, and vacuum drying, organic montmorillonite is obtained, where the mass ratio of cetyltrimethylammonium bromide to montmorillonite is 1:1; Preparation of modified montmorillonite: Add the above-mentioned organic montmorillonite and tetrabutyl titanate to xylene according to a mass ratio of 2:1:3.3, stir and mix well to obtain a mixed suspension. Then add urushiol to the mixed suspension, and heat and stir at 70 °C for 1 h, then heat and stir at 110 °C for 2 h, and finally heat and stir at 135 °C for 1 h. After cooling, modified montmorillonite is obtained. Its TEM image is as shown in Figure 1 shown, in which, the mass ratio of urushiol to tetrabutyl titanate is 1.8:1; Prepare a high-temperature resistant additive: Add ZrOCl2·8H2O to absolute ethanol, stir and dissolve it fully, then add acetylacetone and stir and react for 1 h to obtain a mixed solution. Among them, the molar ratio of ZrOCl2·8H2O to absolute ethanol is 1:25, and the molar ratio of acetylacetone to ZrOCl2·8H2O is 1:1. Then add diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate to the mixed solution, and heat and stir at 70 °C for 2 h, and perform rotary evaporation at 100 °C for 15 min to obtain a high-temperature resistant additive. Among them, the molar ratio of diphenyldimethoxysilane to 3-(triethoxysilyl)propyl methacrylate is 1.8:1, and the molar ratio of diphenyldimethoxysilane to ZrOCl2·8H2O is 6.5:1; S1: Add 30 parts by mass of boron phenolic resin, 10 parts by mass of epoxy vinyl ester resin, 10 parts by mass of high-temperature resistant additive, 15 parts by mass of alumina, 12 parts by mass of modified montmorillonite, 5 parts by mass of garnet micropowder, 2 parts by mass of ammonium perphosphate and 6 parts by mass of mica powder to a disperser, and after uniform mixing, a mixed material is obtained; S2: Stir and mix 20 parts by mass of ethylenediamine and 15 parts by mass of absolute ethanol fully, then add 35 parts by mass of glass fiber modified with silane coupling agent KH-550 and 1 part by mass of PBO fiber modified with silane coupling agent KH-550, and after uniform dispersion, a mixed dispersion liquid is obtained. Among them, the main component content of garnet micropowder is: 36 wt% SiO2, 20 wt% Al2O3, 22 wt% FeO, 8 wt% MgO, 6 wt% CaO, 4 wt% Fe2O3; S3: Add the above-mentioned mixed material to the above-mentioned mixed dispersion liquid, and stir and disperse it under vacuum and seal for 30 min, then inject it into a preheated mold, rotate at 400 r / min and 140 °C for 40 min, and after demolding, trimming and grinding, a glass steel pipe is obtained.

[0023] Example 2 A preparation process of a corrosion-resistant glass steel pipe includes the following steps: Prepare organic montmorillonite: Montmorillonite was dispersed in deionized water at a solid-liquid ratio of 1 g:15 mL and ultrasonicated for 1.5 h to obtain a montmorillonite suspension. Subsequently, cetyltrimethylammonium bromide was dissolved in an 80% ethanol solution at a solid-liquid ratio of 1 g:9 mL to prepare a cetyltrimethylammonium bromide solution, which was then dropped into the montmorillonite suspension and heated with stirring at 80 °C for 4.5 h. After filtration, washing, and vacuum drying, organophilic montmorillonite was obtained, where the mass ratio of cetyltrimethylammonium bromide to montmorillonite was 1.5:1; Preparation of modified montmorillonite: Organophilic montmorillonite and tetrabutyl titanate were added to xylene at a mass ratio of 2.5:1:3.4, and stirred and mixed thoroughly to obtain a mixed suspension. Then, urushiol was added to the mixed suspension and heated with stirring at 75 °C for 1.5 h, followed by heating with stirring at 115 °C for 2.5 h, and finally heating with stirring at 138 °C for 1.5 h. After cooling, modified montmorillonite was obtained, where the mass ratio of urushiol to tetrabutyl titanate was 1.9:1; Preparation of high-temperature resistant additive: ZrOCl₂·8H₂O was added to absolute ethanol and stirred and dissolved thoroughly. Then, acetylacetone was added and stirred and reacted for 1.5 h to obtain a mixed solution, where the molar ratio of ZrOCl₂·8H₂O to absolute ethanol was 1:28, and the molar ratio of acetylacetone to ZrOCl₂·8H₂O was 1:1. Then, diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate were added to the mixed solution and heated with stirring at 75 °C for 2.5 h. After rotary evaporation at 100 °C for 18 min, a high-temperature resistant additive was obtained, where the molar ratio of diphenyldimethoxysilane to 3-(triethoxysilyl)propyl methacrylate was 2:1, and the molar ratio of diphenyldimethoxysilane to ZrOCl₂·8H₂O was 6.8:1; S1: 35 parts by mass of boron phenolic resin, 15 parts by mass of epoxy vinyl ester resin, 15 parts by mass of high-temperature resistant additive, 20 parts by mass of magnesium oxide, 14 parts by mass of modified montmorillonite, 10 parts by mass of garnet micropowder, 2.5 parts by mass of ammonium perphosphate, and 7 parts by mass of mica powder were added to a disperser and uniformly mixed to obtain a mixed material; S2: 25 parts by mass of ethylenediamine and 20 parts by mass of absolute ethanol were stirred and mixed thoroughly, and then 40 parts by mass of glass fiber modified with silane coupling agent KH-550 and 2 parts by mass of PBO fiber modified with silane coupling agent KH-550 were added and uniformly dispersed to obtain a mixed dispersion liquid, where the main component content of the garnet micropowder was: 38.3 wt% SiO₂, 23.7 wt% Al₂O₃, 22.8 wt% FeO, 10.5 wt% MgO, 7.4 wt% CaO, 4.2 wt% Fe₂O₃, 0.3 wt% TiO₂, and 0.1 wt% MnO; S3: Add the above mixed materials into the above mixed dispersion liquid, stir and disperse them in a vacuum and airtight manner for 35 min, then inject them into a preheated mold, rotate at 450 r / min and 150 °C for 45 min, and obtain a glass steel pipe after demolding, trimming and edging.

[0024] Example 3 A preparation process of a corrosion-resistant glass steel pipe includes the following steps: Prepare organic montmorillonite: Disperse montmorillonite in deionized water according to the solid-liquid ratio of 1 g: 20 mL, and perform ultrasonic treatment for 2 h to obtain a montmorillonite suspension. Subsequently, dissolve cetyltrimethylammonium bromide in an 80% ethanol solution according to the solid-liquid ratio of 1 g: 10 mL to prepare a cetyltrimethylammonium bromide solution, then drop it into the montmorillonite suspension, and then heat and stir at 85 °C for 5 h, and then filter, wash and dry in vacuum to obtain organic montmorillonite, wherein the mass ratio of cetyltrimethylammonium bromide to montmorillonite is 2:1; Prepare modified montmorillonite: Add organic montmorillonite and tetrabutyl titanate into xylene according to the mass ratio of 3:1:3.5, fully stir and mix to obtain a mixed suspension, then add urushiol to the mixed suspension, and heat and stir at 80 °C for 2 h, and then heat and stir at 120 °C for 3 h, and finally heat and stir at 140 °C for 2 h. After cooling, obtain modified montmorillonite, wherein the mass ratio of urushiol to tetrabutyl titanate is 2:1; Prepare a high-temperature resistant additive: Add ZrOCl2·8H2O into absolute ethanol, fully stir and dissolve it, then add acetylacetone and stir and react for 2 h to obtain a mixed solution, wherein the molar ratio of ZrOCl2·8H2O to absolute ethanol is 1:30, and the molar ratio of acetylacetone to ZrOCl2·8H2O is 1:1. Then add diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate to the mixed solution, and heat and stir at 80 °C for 3 h, and perform rotary evaporation at 100 °C for 20 min to obtain a high-temperature resistant additive, wherein the molar ratio of diphenyldimethoxysilane to 3-(triethoxysilyl)propyl methacrylate is 2.2:1, and the molar ratio of diphenyldimethoxysilane to ZrOCl2·8H2O is 7:1; S1: Add 40 parts by mass of boron phenolic resin, 20 parts by mass of epoxy vinyl ester resin, 20 parts by mass of high-temperature resistant additive, 25 parts by mass of aluminum hydroxide, 16 parts by mass of modified montmorillonite, 15 parts by mass of garnet micropowder, 3 parts by mass of zinc borate and 8 parts by mass of mica powder into a disperser, and after uniform mixing, obtain a mixed material; S2: Thoroughly stir and mix 30 parts by mass of ethylenediamine and 25 parts by mass of absolute ethanol, then add 45 parts by mass of glass fiber modified with 3 - aminopropyltriethoxysilane (KH - 550) and 3 parts by mass of PBO fiber modified with 3 - aminopropyltriethoxysilane (KH - 550). After uniform dispersion, a mixed dispersion liquid is obtained. Among them, the main component content of garnet micropowder is: 40wt% SiO₂, 24wt% Al₂O₃, 24wt% FeO, 13wt% MgO, 9wt% CaO, 6wt% Fe₂O₃, 0.5wt% TiO₂, and 0.5wt% MnO; S3: Add the above - mentioned mixed materials into the above - mentioned mixed dispersion liquid, and stir and disperse them under vacuum and in a closed state for 40 min, then inject them into a pre - heated mold, rotate at 500 r / min and 160 °C for 50 min, and after demolding, trimming the edges and grinding the edges, a glass steel pipe is obtained.

[0025] Comparative Example 1 The difference between this Comparative Example 1 and Example 1 is that the high - temperature resistant additive in step S1 is removed.

[0026] Comparative Example 2 The difference between this Comparative Example 2 and Example 1 is that the modified montmorillonite in step S1 is removed.

[0027] Comparative Example 3 The difference between this Comparative Example 3 and Example 1 is that the garnet micropowder in step S1 is replaced with an equal amount of PBO fiber.

[0028] Comparative Example 4 The difference between this Comparative Example 4 and Example 1 is that the PBO fiber in step S2 is replaced with an equal amount of garnet micropowder.

[0029] Test Example Test 1: Use a comprehensive thermal analyzer to conduct thermal stability analysis on the glass steel pipes prepared in Examples 1 - 3 and Comparative Examples 1, 3, and 4, measure the thermal weight - loss rate of the glass steel pipes from room temperature to 400 °C. Each group repeats the experiment three times and takes the average value. The results are shown in Table 1.

[0030] Table 1: Test results of the thermal weight - loss rate of the glass steel pipe

[0031] As shown in Table 1, after not adding the high-temperature resistant additive in Comparative Example 1, the thermal weight loss rate of the prepared glass steel pipe is significantly higher than that in Example 1. Thus, it can be seen that by first dissolving zirconium oxychloride octahydrate in absolute ethanol, then adding acetylacetone, and using the keto group to chelate with zirconium ions to form a stable six-coordinate complex to inhibit hydrolysis, and then adding diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate for reaction to prepare a high-temperature resistant additive containing Si-O-Zr bonds, after adding it into the boron phenolic resin and making a glass steel pipe, the high-temperature resistant performance of the glass steel pipe can be effectively improved.

[0032] In addition, when only one of PBO fibers or garnet micropowders is added in Comparative Example 3 and Comparative Example 4, the thermal weight loss rate of the prepared glass steel pipe is higher than that in Example 1. It can be seen that the combined use of PBO fibers and garnet micropowders can improve the high-temperature resistant performance of the glass steel pipe.

[0033] Test 2: The glass steel pipe samples prepared in Examples 1-3 and Comparative Example 2 were respectively placed in sulfuric acid with a concentration of 20% and sodium hydroxide solution with a concentration of 30%. After soaking for 30 days, the mass loss was measured. Each group repeated the experiment three times and the average value was taken. The results are shown in Table 2.

[0034] Table 2: Results of acid and alkali corrosion resistance test

[0035] As shown in Table 2, after not adding the modified montmorillonite in Comparative Example 2, the acid and alkali immersion mass loss rates of the prepared glass steel pipe are higher than those in Example 1. Thus, it can be seen that by first preparing organic montmorillonite with cetyltrimethylammonium bromide as an intercalating agent, and then dispersing the organic montmorillonite and tetrabutyl titanate in xylene to make the titanium-oxygen bond of tetrabutyl titanate react with the surface hydroxyl groups of the organic montmorillonite to form Ti-O-Si bonds, and then adding urushiol for reaction to make the phenolic hydroxyl group of urushiol esterify with tetrabutyl titanate to form a modified montmorillonite with a stable organic-inorganic hybrid structure, after adding it into the boron phenolic resin to make a glass steel pipe, the acid and alkali corrosion resistance performance of the glass steel pipe can be effectively improved.

[0036] Test 3: The limiting oxygen index of the glass steel pipes prepared in Examples 1-3 and Comparative Examples 3-4 was tested. Each group repeated the experiment three times and the average value was taken. The results are shown in Table 3.

[0037] Table 3: Limiting oxygen index of glass steel pipes

[0038] As shown in Table 3, when only one of PBO fiber or garnet micropowder was added in Comparative Example 3 and Comparative Example 4, the limiting oxygen index of the prepared glass steel pipe was lower than that of Example 1. Thus, it can be seen that the combined use of PBO fiber and garnet micropowder can synergistically improve the flame retardant performance of the glass steel pipe.

[0039] The above embodiments merely illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A preparation process of a corrosion-resistant glass steel pipe, characterized in that, The steps include: S1: adding boron phenolic resin, epoxy vinyl ester resin, high temperature resistant additive, flux, modified montmorillonite, garnet powder, flame retardant and mica powder into a disperser, and uniformly mixing to obtain a mixed material; S2: Ethylenediamine and anhydrous ethanol are fully stirred and mixed, and then glass fiber and PBO fiber modified by silane coupling agent are added and uniformly dispersed to obtain a mixed dispersion; S3: Add the above-mentioned mixed material into the above-mentioned mixed dispersion, stir and disperse it in a vacuum-sealed manner for 30-40 minutes, then inject it into a preheated mold, rotate it at 400-500r / min and 140-160℃ for 40-50min, and obtain the glass fiber reinforced plastic pipe after demoulding, edge trimming and edge grinding.

2. The preparation process of a corrosion-resistant glass steel pipe according to claim 1, characterized in that, The preparation steps of modified montmorillonite are as follows: A1: Add organic montmorillonite and tetrabutyl titanate into xylene in a mass ratio of (2-3):1:(3.3-3.5), stir and mix thoroughly to obtain a mixed suspension; A2: Add urushiol to the above mixed suspension, heat and stir at 70-80°C for 1-2h, then heat and stir at 110-120°C for 2-3h, and finally heat and stir at 135-140°C for 1-2h. After cooling, modified montmorillonite is obtained, wherein the mass ratio of urushiol to tetrabutyl titanate is (1.8-2):

1.

3. The preparation process of a corrosion-resistant glass steel pipe according to claim 2, characterized in that, The preparation steps of organic montmorillonite are as follows: Montmorillonite is dispersed in deionized water at a solid-liquid ratio of 1g:(10-20)mL, and ultrasonically treated for 1-2h to obtain a montmorillonite suspension. Subsequently, hexadecyltrimethylammonium bromide is dissolved in 80% ethanol solution at a solid-liquid ratio of 1g:(8-10)mL to prepare a hexadecyltrimethylammonium bromide solution, which is then dropped into the montmorillonite suspension, heated and stirred at 75-85°C for 4-5h, and then filtered, washed and vacuum dried to obtain an organic montmorillonite, wherein the mass ratio of hexadecyltrimethylammonium bromide to montmorillonite is (1-2):

1.

4. The preparation process of a corrosion-resistant glass steel pipe according to claim 1, characterized in that, The preparation steps of high temperature resistant additives are as follows: B1: Add ZrOCl2·8H2O to anhydrous ethanol, stir thoroughly to dissolve, then add acetylacetone, and stir to react for 1-2 hours to obtain a mixed solution, wherein the molar ratio of ZrOCl2·8H2O to anhydrous ethanol is 1:(25-30), and the molar ratio of acetylacetone to ZrOCl2·8H2O is 1:1; B2: Add diphenyldimethoxysilane and 3-(triethoxysilyl)propyl methacrylate to the above mixed solution, heat and stir at 70-80°C for 2-3h, and rotary evaporate at 100°C for 15-20min to obtain a high temperature resistant additive.

5. The preparation process of a corrosion-resistant glass steel pipe according to claim 4, characterized in that, The molar ratio of diphenyldimethoxysilane to 3-(triethoxysilyl)propyl methacrylate is (1.8-2.2):1, and the molar ratio of diphenyldimethoxysilane to ZrOCl2·8H2O is (6.5-7):

1.

6. The preparation process of a corrosion-resistant glass steel pipe according to claim 1, characterized in that, By mass parts, the raw material composition of the glass steel pipe is as follows: 30 - 40 parts of boron phenolic resin, 10 - 20 parts of epoxy vinyl ester resin, 10 - 20 parts of high-temperature resistant additive, 12 - 16 parts of modified montmorillonite, 15 - 25 parts of flux, 5 - 15 parts of garnet micropowder, 2 - 3 parts of flame retardant, 6 - 8 parts of mica powder, 35 - 45 parts of glass fiber, 1 - 3 parts of PBO fiber, 20 - 30 parts of ethylenediamine, and 15 - 25 parts of absolute ethanol; wherein, the flame retardant is any one of ammonium perphosphate and zinc borate, and the flux is any one of alumina, magnesia or aluminum hydroxide.

7. The preparation process of a corrosion-resistant glass steel pipe according to claim 6, characterized in that, The main component content of the garnet micropowder is: 36 - 40wt% SiO2, 20 - 24wt% Al2O3, 22 - 24wt% FeO, 8 - 13wt% MgO, 6 - 9wt% CaO, 4 - 6wt% Fe2O3, 0 - 0.5wt% TiO2, and 0 - 0.5wt% MnO.

8. The preparation process of a corrosion-resistant glass steel pipe according to claim 1, characterized in that, The structural formula of the epoxy vinyl ester resin is: 。 9. A corrosion-resistant glass steel pipe, characterized in that, It is prepared by the preparation process of a corrosion-resistant glass steel pipe according to any one of claims 1 - 8.

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