Waterproof acid and alkali resistant coating for gas pipeline and preparation method thereof

Abstract

This invention relates to a waterproof and acid-alkali resistant coating for gas pipelines. The coating comprises the following components: waterborne polyurethane, acrylic emulsion, modified acrylic resin, and modified filler. The modified acrylic resin is obtained by reacting N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate. The modified filler is obtained by reacting KH550-modified graphene oxide, zinc oxide, and titanium dioxide with methyl acrylate, followed by a reaction with ethylenediamine. This application innovatively designs the preparation process of the modified acrylic resin and modified filler, introduces specific functional monomers for resin copolymerization modification, and modifies the inorganic filler, effectively improving the compatibility of the resin and filler, as well as the overall protective performance of the coating.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a waterproof and acid-alkali resistant coating for gas pipelines and its preparation method. Background Technology

[0002] The safe and stable operation of gas pipelines is crucial for urban infrastructure. Pipelines, buried underground or exposed to complex environments, are susceptible to multiple forms of damage, including moisture infiltration, corrosion from acidic and alkaline media in the soil, microbial erosion, and physical wear, directly impacting their service life and the safety of gas transmission. Therefore, effective surface protection of gas pipelines is a critical aspect of engineering projects. Coating protection, as an economical, convenient, and efficient corrosion prevention method, is widely used in the field of external pipeline corrosion protection.

[0003] In recent years, with increasingly stringent environmental regulations, waterborne coating systems, represented by waterborne polyurethane and acrylic resins, have gradually become an important alternative to traditional solvent-based anti-corrosion coatings due to their advantages such as low volatile organic compound (VOC) content and environmental friendliness. In existing technologies, waterborne polyurethane is often physically blended or simply copolymerized with acrylic emulsions to achieve a balance between the flexibility and abrasion resistance of polyurethane and the weather resistance and adhesion of acrylic resins. Simultaneously, to improve the mechanical strength, barrier properties, and corrosion resistance of the coating, inorganic fillers such as graphene and metal oxides (e.g., zinc oxide, titanium dioxide) are often added.

[0004] However, existing waterproof and acid-alkali resistant coatings for gas pipelines still have several significant drawbacks:

[0005] Insufficient corrosion resistance and adhesion of the resin matrix: Conventional water-based acrylic or polyurethane resins have limited chemical stability when faced with continuous acid and alkali erosion, making them prone to hydrolysis or swelling, which leads to a decline in the protective performance of the coating. In addition, the adhesion between the resin and the metal pipe substrate, especially the wet adhesion in humid environments, is often not ideal, easily causing the coating to blister and peel off.

[0006] Poor filler dispersibility and interfacial adhesion: Directly added nano- or micron-sized inorganic fillers (such as graphene oxide and titanium dioxide) tend to agglomerate in the resin matrix and are difficult to disperse uniformly. This not only affects the density and appearance of the coating, but also creates defects and stress concentration points at the filler-resin interface, becoming a rapid channel for corrosive media penetration and severely weakening the reinforcing and shielding effects of the filler.

[0007] Imbalance in overall coating performance: It is difficult to achieve organic synergy between the resin phase and the filler phase by simply relying on physical blending. While pursuing high hardness and high corrosion resistance, coatings often sacrifice necessary flexibility and impact resistance, making them prone to microcracks under pipeline transportation, installation, or soil stress, thus accelerating the failure process.

[0008] In response to the above problems, those skilled in the art have been seeking to fundamentally improve the overall protective performance of coatings by effectively chemically modifying resins and fillers. Summary of the Invention

[0009] This invention provides a waterproof and acid-alkali resistant coating for gas pipelines. By innovatively designing the preparation process of modified acrylic resin and modified filler, this invention introduces specific functional monomers for resin copolymerization modification and modifies inorganic fillers, effectively improving the compatibility of resin and filler and the overall protective performance of the coating, thereby solving the technical defects of existing gas pipeline coatings such as insufficient acid and alkali resistance and waterproof performance.

[0010] Therefore, it is necessary to provide a waterproof and acid-alkali resistant coating for gas pipelines, wherein the waterproof and acid-alkali resistant coating for gas pipelines comprises the following components in parts by weight:

[0011] 35-60 parts of waterborne polyurethane

[0012] 15-25 parts acrylic emulsion

[0013] 5-10 parts of modified acrylic resin

[0014] 15-20 parts of modified filler

[0015] Emulsifier 1 2-5 parts

[0016] 1-8 parts of auxiliary agent

[0017] Solvent 10-40 parts;

[0018] The modified acrylic resin is obtained by reacting N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate.

[0019] The modified filler is obtained by reacting KH550 modified graphene oxide, zinc oxide, titanium dioxide with methyl acrylate, and then with ethylenediamine.

[0020] Furthermore, the acrylic emulsion is selected from one or more of styrene-acrylic emulsion and pure acrylic emulsion.

[0021] Furthermore, the waterborne polyurethane is selected from one or more of aliphatic polyester modified waterborne polyurethane, aliphatic polycarbonate modified waterborne polyurethane, and aliphatic acrylic modified waterborne polyurethane.

[0022] Furthermore, the emulsifier 1 is selected from one or more of polyoxypropylene lauryl ester and sodium dodecyl sulfate.

[0023] Furthermore, the additive is selected from one or more of the following: leveling agent, defoamer, film-forming aid, antifreeze, dispersant, and mildew inhibitor.

[0024] Furthermore, the solvent is selected from one or more of water and ethanol.

[0025] The present invention also provides a method for preparing the waterproof and acid-alkali resistant coating for gas pipelines, the method comprising the following steps:

[0026] S1. N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate are mixed and heated to react under the action of emulsifier 2 and initiator to obtain the modified acrylic resin.

[0027] S2-1. Mix graphene oxide, zinc oxide, and titanium dioxide evenly to obtain a mixed filler;

[0028] S2-2. Mix the mixed packing material with KH550, heat to react, and obtain the intermediate product;

[0029] S3. Mix the intermediate product with methyl acrylate and react at room temperature to obtain intermediate product 2;

[0030] S4. Mix intermediate product 2 with ethylenediamine and react at room temperature to obtain the modified filler;

[0031] S5. The modified filler, modified acrylic resin and other components are blended to obtain the waterproof and acid-alkali resistant coating for gas pipelines.

[0032] Further, in step S1, the mass ratio of N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate is 1-2:0.5-1:5-8:1-2:1-3.

[0033] Further, in step S2-1, the mass ratio of graphene oxide, zinc oxide, and titanium dioxide is 1-2:1-3:1-4;

[0034] In step S2-2, the mass ratio of the mixed packing material to KH550 is 3-5:0.5-0.8.

[0035] Specifically, graphene oxide in the modified filler exhibits excellent two-dimensional barrier effects, significantly extending the diffusion path of corrosive media; zinc oxide and titanium dioxide provide a certain degree of UV shielding and chemical inertness. The synergistic effect of these three materials, tightly bonded to the resin network, gives the coating extremely high cross-linking density and physical shielding capabilities, effectively resisting long-term erosion from groundwater, soil acids, alkalis, salts, and microorganisms, thus significantly extending the maintenance cycle and service life of gas pipelines. Simultaneously, the combination of these three materials also endows the coating with good antistatic properties, which helps prevent combustion problems after gas leaks, increasing safety.

[0036] Further, in step S3, the mass ratio of the intermediate product to methyl acrylate is 1-2:5-8;

[0037] In step S4, the mass ratio of intermediate product 2 to ethylenediamine is 1-2:6-8.

[0038] The present invention has the following beneficial effects:

[0039] The modified acrylic resin of this invention is copolymerized from N-(n-butoxymethyl)acrylamide, vinyl POSS, 4-amino-3-fluoroallyl benzoate, ethyl acrylate, and hydroxyethyl acrylate, thereby introducing fluorinated segments and POSS groups into the modified acrylic resin. Simultaneously, the modified filler is modified with KH550 silane coupling agent to introduce amino groups, then undergoes addition reaction with methyl acrylate to introduce ester groups, and finally undergoes aminolysis reaction with ethylenediamine, thereby grafting a large number of three-dimensional network structures with terminal amino groups onto the surface of graphene oxide, zinc oxide, and titanium dioxide nanoparticles.

[0040] Firstly, the introduction of acrylate and siloxane segments onto the surface of the modified filler improves its compatibility with organic matrices such as waterborne polyurethane, acrylic emulsions, and modified acrylic resins, ensuring uniform dispersion of the filler in the coating. Simultaneously, the numerous introduced amino groups can form bonds with the active groups of other components, resulting in a tighter internal bond and better overall integrity of the coating, thus forming a stable three-dimensional protective network within the coating. This network not only physically blocks the penetration of moisture and corrosive media, but its chemically stable components also actively resist acid and alkali corrosion, achieving long-term protection.

[0041] The introduction of the rigid nanostructure of vinyl POSS in the modified acrylic resin significantly improves the hardness, thermal stability, and impermeability of the coating. Simultaneously, this component, acting as a crosslinking agent, possesses multiple functional groups, endowing the modified acrylic resin with a stable network and hyperbranched three-dimensional structure. Fluorine-containing segments can regulate the surface energy of the coating, providing excellent hydrophobicity and chemical resistance, thus extending the coating's service life. Furthermore, N-(n-butoxymethyl)acrylamide and hydroxyethyl acrylate enhance the coating's adhesion to the substrate material. In addition, chemical crosslinking and intermolecular forces occur between the modified acrylic resin and the modified filler, as well as between the modified acrylic resin and the substrate resin, resulting in a tight bond. This gives the coating extremely high crosslinking density and physical shielding ability, effectively resisting long-term erosion from groundwater, soil acids, alkalis, salts, and microorganisms, significantly extending the maintenance cycle and service life of gas pipelines. Detailed Implementation

[0042] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0043] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0044] It should be understood that, except in any operational instance or otherwise indicated, all figures representing the amounts of ingredients used, for example, in the specification and claims, should be understood to be modified in all cases by the term "about". Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximations varying with the desired performance to be obtained according to the invention.

[0045] Waterborne polyurethane, R6010, from American company Huajinsi.

[0046] Acrylic emulsion, MAINCOTE HG-56, Dow Chemical.

[0047] Graphene oxide, S25040, Shanghai Yuanye.

[0048] Zinc oxide, S24314, Shanghai Yuanye.

[0049] Titanium dioxide, 5-10nm, Shanghai Yuanye.

[0050] Emulsifier 1, polyoxypropylene laurate.

[0051] Emulsifier 2, OP-10, dodecylphenol polyoxyethylene ether.

[0052] Leveling agent, EFKA 3580, Efka.

[0053] Defoamer, FoamStar A36, Corning.

[0054] KH550, γ-aminopropyltriethoxysilane.

[0055] Initiator: potassium persulfate.

[0056] Vinyl POSS, CAS No.: 69655-76-1, merck, Germany.

[0057] In the embodiments of this invention, "parts" refers to parts by mass.

[0058] Example 1

[0059] A waterproof and acid-alkali resistant coating for gas pipelines, the coating comprising the following components in parts by weight:

[0060] 45 parts of waterborne polyurethane

[0061] 17 parts acrylic emulsion

[0062] 6 parts modified acrylic resin

[0063] 15 parts of modified filler

[0064] Emulsifier 1 2 parts

[0065] 2 parts leveling agent

[0066] 2 parts defoamer

[0067] 20 parts water

[0068] 15 parts ethanol;

[0069] The preparation method of the waterproof and acid-alkali resistant coating for gas pipelines includes the following steps:

[0070] S1. Using water as a solvent, N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, 4-amino-3-fluoroallyl benzoate, emulsifier 2, and initiator are mixed and heated to 80°C for 5 hours to obtain the modified acrylic resin.

[0071] The mass ratio of N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, 4-amino-3-fluoroallyl benzoate, emulsifier 2, and initiator is 1:1:7:1:2:0.6:0.1.

[0072] S2-1. Mix graphene oxide, zinc oxide, and titanium dioxide evenly to obtain a mixed filler;

[0073] The mass ratio of graphene oxide, zinc oxide, and titanium dioxide is 1:1:1;

[0074] S2-2. Under nitrogen protection, using a mixture of ethanol and water in a volume ratio of 5:1 as a solvent, the mixed packing material was mixed with KH550, heated to 75℃ and reacted for 24 hours. The intermediate product was obtained by filtration, washing and drying.

[0075] The mass ratio of the mixed packing to KH550 is 3:0.5;

[0076] S3. Using methanol as a solvent, the intermediate product was mixed with methyl acrylate and reacted at 25°C for 24 hours. After filtration, intermediate product 2 was obtained.

[0077] The mass ratio of the intermediate product to methyl acrylate is 1:5;

[0078] S4. Using methanol as a solvent, intermediate product 2 was mixed with ethylenediamine and reacted at 25°C for 24 hours. After filtration, the modified filler was obtained.

[0079] The mass ratio of intermediate product 2 to ethylenediamine is 1:6;

[0080] S5. According to the above-mentioned mass proportions, the modified filler, modified acrylic resin and other components are blended to obtain the waterproof and acid-alkali resistant coating for gas pipelines.

[0081] Example 2

[0082] A waterproof and acid-alkali resistant coating for gas pipelines, the coating comprising the following components in parts by weight:

[0083] 50 parts of waterborne polyurethane

[0084] 20 parts acrylic emulsion

[0085] 8 parts of modified acrylic resin

[0086] 17 parts of modified filler

[0087] Emulsifier 1 3 parts

[0088] 2 parts leveling agent

[0089] 2 parts defoamer

[0090] 23 parts water

[0091] 17 parts ethanol;

[0092] The preparation method of the waterproof and acid-alkali resistant coating for gas pipelines includes the following steps:

[0093] S1. Using water as a solvent, N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, 4-amino-3-fluoroallyl benzoate, emulsifier 2, and initiator are mixed and heated to 80°C for 5 hours to obtain the modified acrylic resin.

[0094] The mass ratio of N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, 4-amino-3-fluoroallyl benzoate, emulsifier 2, and initiator is 1:1:7:1:2:0.6:0.1.

[0095] S2-1. Mix graphene oxide, zinc oxide, and titanium dioxide evenly to obtain a mixed filler;

[0096] The mass ratio of graphene oxide, zinc oxide, and titanium dioxide is 1:1:1;

[0097] S2-2. Under nitrogen protection, using a mixture of ethanol and water in a volume ratio of 5:1 as a solvent, the mixed packing material was mixed with KH550, heated to 75℃ and reacted for 24 hours. The intermediate product was obtained by filtration, washing and drying.

[0098] The mass ratio of the mixed packing to KH550 is 3:0.5;

[0099] S3. Using methanol as a solvent, the intermediate product was mixed with methyl acrylate and reacted at 25°C for 24 hours. After filtration, intermediate product 2 was obtained.

[0100] The mass ratio of the intermediate product to methyl acrylate is 1:5;

[0101] S4. Using methanol as a solvent, intermediate product 2 was mixed with ethylenediamine and reacted at 25°C for 24 hours. After filtration, the modified filler was obtained.

[0102] The mass ratio of intermediate product 2 to ethylenediamine is 1:6;

[0103] S5. According to the above-mentioned mass proportions, the modified filler, modified acrylic resin and other components are blended to obtain the waterproof and acid-alkali resistant coating for gas pipelines.

[0104] Example 3

[0105] A waterproof and acid-alkali resistant coating for gas pipelines, the coating comprising the following components in parts by weight:

[0106] 55 parts of waterborne polyurethane

[0107] 23 parts acrylic emulsion

[0108] 9 parts modified acrylic resin

[0109] 19 parts of modified filler

[0110] Emulsifier 1 4 parts

[0111] 2 parts leveling agent

[0112] 2 parts defoamer

[0113] 22 parts water

[0114] 18 parts ethanol;

[0115] The preparation method of the waterproof and acid-alkali resistant coating for gas pipelines includes the following steps:

[0116] S1. Using water as a solvent, N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, 4-amino-3-fluoroallyl benzoate, emulsifier 2, and initiator are mixed and heated to 80°C for 5 hours to obtain the modified acrylic resin.

[0117] The mass ratio of N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, 4-amino-3-fluoroallyl benzoate, emulsifier 2, and initiator is 1:1:7:1:2:0.6:0.1.

[0118] S2-1. Mix graphene oxide, zinc oxide, and titanium dioxide evenly to obtain a mixed filler;

[0119] The mass ratio of graphene oxide, zinc oxide, and titanium dioxide is 1:1:1;

[0120] S2-2. Under nitrogen protection, using a mixture of ethanol and water in a volume ratio of 5:1 as a solvent, the mixed packing material was mixed with KH550, heated to 75℃ and reacted for 24 hours. The intermediate product was obtained by filtration, washing and drying.

[0121] The mass ratio of the mixed packing to KH550 is 3:0.5;

[0122] S3. Using methanol as a solvent, the intermediate product was mixed with methyl acrylate and reacted at 25°C for 24 hours. After filtration, intermediate product 2 was obtained.

[0123] The mass ratio of the intermediate product to methyl acrylate is 1:5;

[0124] S4. Using methanol as a solvent, intermediate product 2 was mixed with ethylenediamine and reacted at 25°C for 24 hours. After filtration, the modified filler was obtained.

[0125] The mass ratio of intermediate product 2 to ethylenediamine is 1:6;

[0126] S5. According to the above-mentioned mass proportions, the modified filler, modified acrylic resin and other components are blended to obtain the waterproof and acid-alkali resistant coating for gas pipelines.

[0127] Comparative Example 1

[0128] A waterproof and acid-alkali resistant coating for gas pipelines. The difference between this comparative example and Example 1 is that steps S3 and S4 are removed, and the modified filler in the components is replaced with an equal mass of intermediate product. The other components and preparation methods are the same.

[0129] Comparative Example 2

[0130] A waterproof and acid-alkali resistant coating for gas pipelines. The difference between this comparative example and Example 1 is that in step S1, vinyl POSS is replaced with an equal mass of ethyl acrylate, while the other components and preparation methods are the same.

[0131] Test Example 1

[0132] The waterproof and acid-alkali resistant coatings for gas pipelines prepared in Example 1 and Comparative Examples 1-2 were applied to the surface of a polished iron plate and subjected to performance testing after drying.

[0133] Test method:

[0134] Water resistance: Tested in accordance with GB / T 1733-1993.

[0135] Acid resistance: Tested according to GB / T 2974-1988.

[0136] Alkali resistance: Tested according to GB / T 2974-1988.

[0137] Hardness: Tested according to GB / T 6739.

[0138] Adhesion: Tested in accordance with GB / T 9286-1998.

[0139] Surface resistivity: Tested in accordance with GB6950-2001.

[0140] The test results are shown in Table 1.

[0141] Table 1. Performance test results of waterproof and acid-alkali resistant coatings for gas pipelines in Examples 1 and 1-2

[0142]

[0143] Table 1 shows that the waterproof and acid-alkali resistant coating for gas pipelines prepared by this invention has excellent comprehensive protective performance, which is better than that of comparative examples 1-2. Through the synergistic effect of modified acrylic resin and modified filler, this invention can simultaneously improve the waterproof, acid-alkali resistant, corrosion resistant, mechanical hardness and antistatic properties of the coating, meeting the protection needs of gas pipelines in long-term complex environments. In contrast, when the modified filler or modified acrylic resin was replaced in the comparative examples, many properties were significantly reduced.

[0144] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0145] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waterproof and acid-alkali resistant coating for gas pipelines, characterized in that, The waterproof and acid-alkali resistant coating for gas pipelines comprises the following components in parts by weight: 35-60 parts of waterborne polyurethane 15-25 parts acrylic emulsion 5-10 parts of modified acrylic resin 15-20 parts of modified filler Emulsifier 1 2-5 parts 1-8 parts of auxiliary agent Solvent 10-40 parts; The modified acrylic resin is obtained by reacting N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate. The modified filler was prepared by the following method: S2-1. Mix graphene oxide, zinc oxide, and titanium dioxide evenly to obtain a mixed filler; S2-2. Mix the mixed packing material with KH550, heat to react, and obtain the intermediate product; S3. Mix the intermediate product with methyl acrylate and react at room temperature to obtain intermediate product 2; S4. Mix intermediate product 2 with ethylenediamine and react at room temperature to obtain the modified filler.

2. The waterproof and acid-alkali resistant coating for gas pipelines according to claim 1, characterized in that, The acrylic emulsion is selected from one or more of styrene-acrylic emulsion and pure acrylic emulsion.

3. The waterproof and acid-alkali resistant coating for gas pipelines according to claim 1, characterized in that, The waterborne polyurethane is selected from one or more of aliphatic polyester modified waterborne polyurethane, aliphatic polycarbonate modified waterborne polyurethane, and aliphatic acrylic modified waterborne polyurethane.

4. The waterproof and acid-alkali resistant coating for gas pipelines according to claim 1, characterized in that, The emulsifier 1 is selected from one or more of polyoxypropylene lauryl ester and sodium dodecyl sulfate.

5. The waterproof and acid-alkali resistant coating for gas pipelines according to claim 1, characterized in that, The additives are selected from one or more of the following: leveling agents, defoamers, film-forming aids, antifreeze agents, dispersants, and antifungal agents.

6. The waterproof and acid-alkali resistant coating for gas pipelines according to claim 1, characterized in that, The solvent is selected from one or more of water and ethanol.

7. The method for preparing the waterproof and acid-alkali resistant coating for gas pipelines according to any one of claims 1-6, characterized in that, The preparation method of the waterproof and acid-alkali resistant coating for gas pipelines includes the following steps: S1. N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate are mixed and heated to react under the action of emulsifier 2 and initiator to obtain the modified acrylic resin. S2-1. Mix graphene oxide, zinc oxide, and titanium dioxide evenly to obtain a mixed filler; S2-2. Mix the mixed packing material with KH550, heat to react, and obtain the intermediate product; S3. Mix the intermediate product with methyl acrylate and react at room temperature to obtain intermediate product 2; S4. Mix intermediate product 2 with ethylenediamine and react at room temperature to obtain the modified filler; S5. The modified filler, modified acrylic resin and other components are blended to obtain the waterproof and acid-alkali resistant coating for gas pipelines.

8. The method for preparing the waterproof and acid-alkali resistant coating for gas pipelines according to claim 7, characterized in that, In step S1, the mass ratio of N-(n-butoxymethyl)acrylamide, vinyl POSS, ethyl acrylate, hydroxyethyl acrylate, and 4-amino-3-fluoroallyl benzoate is 1-2:0.5-1:5-8:1-2:1-3.

9. The method for preparing the waterproof and acid-alkali resistant coating for gas pipelines according to claim 7, characterized in that, In step S2-1, the mass ratio of graphene oxide, zinc oxide, and titanium dioxide is 1-2:1-3:1-4; In step S2-2, the mass ratio of the mixed packing material to KH550 is 3-5:0.5-0.

8.

10. The method for preparing the waterproof and acid-alkali resistant coating for gas pipelines according to claim 7, characterized in that, In step S3, the mass ratio of the intermediate product to methyl acrylate is 1-2:5-8; In step S4, the mass ratio of intermediate product 2 to ethylenediamine is 1-2:6-8.

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