Graphene oxide and siloxane polymer composite modified polymer anticorrosive coating, and preparation method and application thereof

Abstract

The application belongs to the technical field of anticorrosive materials, and particularly relates to an oxidized graphene and siloxane polymer composite modified geopolymer anticorrosive paint as well as a preparation method and application thereof. The preparation raw materials of the oxidized graphene and siloxane polymer composite modified geopolymer anticorrosive paint include the following components: a silico-aluminate mineral, an alkali activator, oxidized graphene, a surfactant, a siloxane polymer, a silane coupling agent, polyvinyl alcohol powder, titanium white powder and an organic silicon defoaming agent. The siloxane polymer is used as a main hydrophobic agent, and the silane coupling agent is used as an auxiliary hydrophobic agent. The oxidized graphene-geopolymer coating is hydrophobically modified, the hydrophobicity and durability of the geopolymer coating are improved, and the geopolymer coating has excellent corrosion resistance and service life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anticorrosive materials, and particularly relates to a graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating as well as a preparation method and application thereof. BACKGROUND

[0002] During the long-term use of modern buildings and infrastructures, water, as the main carrier of harmful ions, is the key factor leading to the corrosion of steel bars and the deterioration of concrete structures. The most widely used coating materials, such as epoxy resin, polyurethane and acrylic, have good chemical resistance, impermeability and corrosion resistance. However, the low mechanical strength, easy aging and poor weather resistance of the coating lead to the need for frequent repair or replacement of the coating. In addition, these materials produce volatile organic compounds (VOCs) during production and construction, which are potentially harmful to the atmosphere and human health. Therefore, developing more durable and environmentally friendly coating materials has become the first step to improve the durability and protective performance of concrete and steel structures. Geopolymer is an inorganic polymer, which is usually synthesized by alkali activation of aluminosilicate precursors. The special aluminosilicate network structure formed during the hardening process is beneficial to the coating and protection of the substrate surface. Geopolymer generally has high mechanical strength, good chemical stability and compactness. In addition, geopolymer is a sustainable cementitious material that can reduce the CO2 footprint. Although the incorporation of graphene oxide into geopolymer proposed in patent CN118240403A can establish a high-density polymer network system and improve the interfacial bonding capacity of the coating to steel, the graphene oxide-geopolymer coating is still a hydrophilic material, which makes it vulnerable to water intrusion, seriously affecting the corrosion resistance and service life of the geopolymer coating. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating and its preparation method and application. The graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating provided by the present application has strong corrosion resistance and long service life.

[0004] In order to achieve the above purpose, the present application provides the following technical solutions:

[0005] The present application provides a graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating. The preparation raw materials include the following components in mass fraction:

[0006] 140-160 parts of aluminosilicate minerals,

[0007] 95-105 parts of alkali activator,

[0008] 0.05-0.2 parts of graphene oxide,

[0009] surfactant 0.05-0.2 parts,

[0010]

[0011] Preferably, the specific surface area of the graphene oxide is 100-400 m 2 / g; the layer number of the graphene oxide is 1-2 layers; and the flake diameter of the graphene oxide is 0.2-10 μm.

[0012] Preferably, the siloxane polymer is polydimethylsiloxane.

[0013] Preferably, the silane coupling agent is silane coupling agent KH550.

[0014] Preferably, the alkali activator comprises sodium hydroxide, water and water glass; and the modulus of the alkali activator is 1.3-2 M.

[0015] Preferably, the aluminosilicate mineral comprises one or more of fly ash, slag and metakaolin.

[0016] The present application also provides a preparation method of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating.

[0017] Part of the alkali activator, graphene oxide and surfactant are first mixed to obtain a graphene oxide dispersion;

[0018] The siloxane polymer, silane coupling agent and the remaining alkali activator are second mixed to hydrolyze to obtain a hydrophobic modifier;

[0019] The graphene oxide dispersion, silicone defoaming agent, hydrophobic modifier, aluminosilicate mineral, polyvinyl alcohol powder and titanium white powder are third mixed to obtain the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating.

[0020] The present application also provides an application of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating in steel anticorrosion.

[0021] The present application also provides a preparation method of a hydrophobic geopolymer inorganic anticorrosive coating.

[0022] The graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating is coated on the surface of steel to dry to obtain the hydrophobic geopolymer inorganic anticorrosive coating.

[0023] The graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating is prepared by the method of any one of claims 1-6 or the method of claim 7.

[0024] Preferably, the coating is spraying, the diameter of the nozzle used in the spraying is 2-4 mm, the pressure of the spraying is 3-5 MPa, the distance between the nozzle and the steel material used in the spraying is 12-18 cm, the time of the spraying is 10-15 s, and the coating amount of the spraying is 0.2-0.3 g / cm 2 .

[0025] The graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating is prepared by the method of any one of claims 1-6 or the method of claim 7.

[0026] The graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating is prepared by the method of any one of claims 1-6 or the method of claim 7.

[0027] The graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating is prepared by the method of any one of claims 1-6 or the method of claim 7. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The contact angle diagram of the surface of the coated steel bars prepared in application examples 1-3 and the coated steel bar of comparative application example 1 is shown in the figure.

[0029] Figure 2A salt spray corrosion test result chart of the coated steel bars prepared in Examples 1 to 3, the coated steel bar of Comparative Example 1, and the uncoated steel bar. DETAILED DESCRIPTION

[0030] The present application provides a graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating, and raw materials for preparing the coating include the following components in mass fraction:

[0031] 140-160 parts of silico-aluminate minerals,

[0032] 95-105 parts of alkali activator,

[0033] 0.05-0.2 parts of graphene oxide,

[0034] 0.05-0.2 parts of surfactant,

[0035] 3-9 parts of siloxane polymer,

[0036]

[0037] Unless otherwise specified, the present application does not have special requirements for the source of the raw materials used for preparation, and commercially available products known to those skilled in the art can be used.

[0038] The present application provides a graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating, and raw materials for preparing the coating include the following components in mass fraction:

[0039] The preparation raw material of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating provided by the present application includes 95-105 parts by mass of an alkali activator, preferably 96-104 parts by mass, based on 1 part by mass of silicate minerals. In the present application, the alkali activator preferably includes sodium hydroxide, water and water glass; the modulus of the alkali activator is preferably 1.3-2M, more preferably 1.4-1.5M; the water is preferably deionized water; the modulus of the water glass is preferably 2-2.5M, more preferably 2.2-2.4M; and the mass ratio of the sodium hydroxide, water and water glass is preferably 3.5-4.5:35-45:55-65, more preferably 4:40:60.

[0040] In the present application, the preparation method of the alkali activator preferably includes the following steps: dissolving sodium hydroxide in water to obtain a sodium hydroxide solution; mixing the sodium hydroxide solution with water glass, and standing to obtain an alkali activator; the mixing is preferably carried out under stirring; the stirring rate is preferably 200-800rpm, more preferably 400-800rpm; the stirring time is preferably 5-10min, more preferably 8-10min; and the standing time is preferably 18-26h, more preferably 24h.

[0041] The preparation raw material of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating provided by the present application includes 0.05-0.2 parts by mass of graphene oxide, preferably 0.1-0.15 parts by mass, based on 1 part by mass of silicate minerals. In the present application, the specific surface area of the graphene oxide is preferably 100-400m 2 / g, more preferably 200-400m 2 / g; the number of layers of the graphene oxide is preferably 1-2 layers, more preferably 1 layer; and the flake diameter of the graphene oxide is preferably 0.2-10μm, more preferably 0.2-5μm.

[0042] Graphene oxide is a carbon-based nanomaterial with high aspect ratio, high specific surface area and elastic modulus. The surface of graphene oxide has many oxygen functional groups, including hydroxyl (-OH), carboxyl (-COOH) and epoxy (-COOC). These groups help graphene oxide interact with geopolymer gel molecules and the oxide film on the surface of steel, effectively densifying the microstructure of geopolymer, improving the inherent high brittleness of geopolymer, and improving the interfacial bonding capacity of geopolymer and steel, thereby enhancing the corrosion resistance of geopolymer coated steel.

[0043] The preparation raw material of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating provided by the present application includes 0.05-0.2 parts of a surfactant, preferably 0.1-0.15 parts, in terms of 1 part by mass of the silicate mineral. In the present application, the surfactant is preferably a polycarboxylic acid water reducer, sodium dodecyl sulfate or polyethylene glycol; more preferably a polycarboxylic acid water reducer.

[0044] The preparation raw material of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating provided by the present application includes 3-9 parts of a siloxane polymer, preferably 3-6 parts, in terms of 1 part by mass of the silicate mineral. In the present application, the siloxane polymer is preferably polydimethylsiloxane; the number average molecular weight of the siloxane polymer is preferably 10,000-100,000, more preferably 20,000-80,000.

[0045] The siloxane polymer has excellent chemical stability, high adhesion and outstanding water resistance. The siloxane polymer has a Si-O-Si main chain structure and a CH3 hydrophobic group, and can cross-link with the silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron structures in the geopolymer through chemical reaction to form a covalent bond, thereby enhancing the mechanical properties, hydrophobicity and durability of the geopolymer, and making the coating have excellent corrosion resistance and service life.

[0046] Polydimethylsiloxane (PDMS) is an organosilicon polymer composed of a Si-O chain and a hydrophobic methyl group (-CH3), and has excellent chemical stability, high adhesion and outstanding water resistance. By modifying the geopolymer coating with graphene oxide and polydimethylsiloxane, a hydrophobic barrier is formed on the surface and in the matrix, thereby reducing the water absorption rate and minimizing the degradation risk associated with harmful ions.

[0047] The preparation raw material of the graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating provided by the present application includes 0.15-0.6 parts of a silane coupling agent, preferably 0.3-0.5 parts, in terms of 1 part by mass of the silicate mineral. In the present application, the silane coupling agent is preferably silane coupling agent KH550.

[0048] The silane coupling agent, as an auxiliary modifier, can ensure good compatibility between the siloxane polymer and the geopolymer matrix, thereby optimizing and enhancing the performance without significantly affecting the original properties of the geopolymer, and making the coating have excellent corrosion resistance and service life.

[0049] The preparation raw material of the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating provided by the present application includes 2-4 parts of polyvinyl alcohol powder, preferably 3 parts, in terms of 1 part of silicate mineral.

[0050] The preparation raw material of the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating provided by the present application includes 7-8 parts of titanium white powder, preferably 7.5 parts, in terms of 1 part of silicate mineral.

[0051] The preparation raw material of the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating provided by the present application includes 0.7-0.8 parts of organic silicon defoaming agent, preferably 0.75 parts, in terms of 1 part of silicate mineral.

[0052] The present application further provides a preparation method of the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating.

[0053] Part of the alkali activator, the graphene oxide and the surfactant are first mixed to obtain a graphene oxide dispersion liquid.

[0054] The siloxane polymer, the silane coupling agent and the remaining alkali activator are second mixed to hydrolyze and obtain a hydrophobic modifier.

[0055] The graphene oxide dispersion liquid, the organic silicon defoaming agent, the hydrophobic modifier, the silicate mineral, the polyvinyl alcohol powder and the titanium white powder are third mixed to obtain the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating.

[0056] Part of the alkali activator, the graphene oxide and the surfactant are first mixed to obtain a graphene oxide dispersion liquid.

[0057] In this invention, the first mixing preferably involves adding graphene oxide to an alkaline activator for a first stirring, then adding a surfactant for a second stirring, and finally ultrasonic dispersion. The first stirring rate is preferably 200–800 rpm, more preferably 500–800 rpm. The first stirring time is preferably 1–2 min, more preferably 1 min. The second stirring rate is preferably 800–1400 rpm, more preferably 1000–1200 rpm. The second stirring time is preferably 3–5 min, more preferably 4 min. The ultrasonic dispersion power is preferably 100–400 W, more preferably 120–300 W. The ultrasonic dispersion time is preferably 60–90 min, more preferably 60–70 min.

[0058] The present invention involves hydrolyzing a mixture of siloxane polymer, silane coupling agent and residual base activator to obtain a hydrophobic modifier.

[0059] In this invention, the second mixing is preferably performed by sequentially adding the siloxane polymer and the silane coupling agent to the remaining base activator; the hydrolysis is preferably carried out under stirring conditions; the stirring rate is preferably 800-1400 rpm, more preferably 1000-1200 rpm; the stirring time is preferably 5-10 min, more preferably 7-10 min.

[0060] After obtaining the graphene oxide dispersion and hydrophobic modifier, the present invention further mixes the graphene oxide dispersion, organosilicon defoamer, hydrophobic modifier, aluminosilicate mineral, polyvinyl alcohol powder and titanium dioxide to obtain a graphene oxide and siloxane polymer composite modified geopolymer anticorrosive coating.

[0061] In this invention, the third mixing preferably involves mixing aluminosilicate minerals, polyvinyl alcohol powder, and titanium dioxide and then stirring to obtain a mixed powder. The graphene oxide dispersion and organosilicon defoamer are then added to the mixed powder for a fourth stirring, followed by the addition of a hydrophobic modifier for a fifth stirring. The third stirring rate is preferably 30–60 rpm, more preferably 40–60 rpm; the third stirring time is preferably 2–4 min, more preferably 2–3 min; the fourth stirring rate is preferably 60–100 rpm, more preferably 80–100 rpm; the fourth stirring time is preferably 1–2 min, more preferably 2 min; the fifth stirring rate is preferably 60–100 rpm, more preferably 80–100 rpm; and the fifth stirring time is preferably 1–3 min, more preferably 2 min.

[0062] The application further provides application of the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating or the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating prepared by the preparation method in steel anticorrosion.

[0063] The application further provides a preparation method of the hydrophobic polymeric inorganic anticorrosive coating, comprising the following steps:

[0064] The graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating is coated on the surface of the steel material, and dried to obtain the hydrophobic polymeric inorganic anticorrosive coating.

[0065] The graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating is the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating described in the above technical solution or the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating prepared by the preparation method described in the above technical solution.

[0066] In the application, the coating is preferably spraying; the diameter of the nozzle used for the spraying is preferably 2-4 mm, more preferably 3 mm; the pressure of the spraying is preferably 3-5 MPa, more preferably 4 MPa; the distance between the nozzle used for the spraying and the steel material is preferably 12-18 cm, more preferably 15 cm; the time of the spraying is preferably 10-15 s, more preferably 10-12 s; the coating amount of the spraying is preferably 0.2-0.3 g / cm 2 , more preferably 0.25 g / cm 2 ; the temperature of the drying is preferably 20-25 DEG C, more preferably 22 DEG C; the time of the drying is preferably 40-60 min, more preferably 50-60 min; the thickness of the hydrophobic polymeric inorganic anticorrosive coating is preferably 180-200 mu m, more preferably 200 mu m.

[0067] The technical solutions in the application will be described clearly and completely in combination with the embodiments in the application, but they should not be understood as limitations to the protection scope of the application.

[0068] Example 1

[0069] 4 g of sodium hydroxide is dissolved in 40 g of deionized water to obtain a sodium hydroxide solution; the sodium hydroxide solution is mixed with 60 g of water glass with a modulus of 2.2 M, stirred at 400 rpm for 10 min, and left to stand for 24 h to obtain an alkali activator with a concentration of 1.5 M;

[0070] 0.1125 g of graphene oxide (specific surface area: 400 m 2The 3 g of polydimethylsiloxane (number average molecular weight of 80,000) and 0.15 g of silane coupling agent (KH550) were sequentially added into 10 g of alkali activator, mixed, and hydrolyzed by stirring at 1000 rpm for 10 min in a magnetic stirrer to obtain a hydrophobic modifier.

[0071] The 3 g of polydimethylsiloxane (number average molecular weight of 80,000) and 0.15 g of silane coupling agent (KH550) were sequentially added into 10 g of alkali activator, mixed, and hydrolyzed by stirring at 1000 rpm for 10 min in a magnetic stirrer to obtain a hydrophobic modifier.

[0072] The 3 g of polydimethylsiloxane (number average molecular weight of 80,000) and 0.15 g of silane coupling agent (KH550) were sequentially added into 10 g of alkali activator, mixed, and hydrolyzed by stirring at 1000 rpm for 10 min in a magnetic stirrer to obtain a hydrophobic modifier.

[0073] Example 2

[0074] The difference from Example 1 is that the 3 g of polydimethylsiloxane and 0.15 g of silane coupling agent (KH550) in Example 1 are replaced by 6 g of polydimethylsiloxane emulsion and 0.3 g of silane coupling agent KH550.

[0075] Example 3

[0076] The difference from Example 1 is that the 3 g of polydimethylsiloxane and 0.15 g of silane coupling agent (KH550) in Example 1 are replaced by 9 g of polydimethylsiloxane emulsion and 0.6 g of silane coupling agent KH550.

[0077] Comparative Example 1

[0078] The difference from Example 1 is that the hydrophobic modifier in Example 1 is not added, and the mass of the alkali activator in the graphene oxide dispersion liquid in Example 1 is replaced by 104 g instead of 94 g.

[0079] Comparative Example 2

[0080] The difference from Example 1 is that the polydimethylsiloxane emulsion is removed from the hydrophobic modifier of Example 1.

[0081] Comparative Example 3

[0082] The difference from Example 1 is that the silane coupling agent KH550 is removed from the hydrophobic modifier of Example 1.

[0083] Application Example 1

[0084] The graphene oxide prepared in Example 1 and the siloxane polymer composite modified polymeric anticorrosive coating is sprayed onto the surface of the steel bar, the diameter of the nozzle used for spraying is 3 mm, the pressure for spraying is 4 MPa, the distance between the nozzle and the steel bar is 15 cm, the spraying time is 10 s, and the coating amount of the spraying is 0.25 g / cm 2 , and dried at 22℃ for 60 min to obtain a hydrophobic polymeric inorganic anticorrosive coating (200 μm in thickness).

[0085] Application Example 2

[0086] The difference from Application Example 1 is that the graphene oxide prepared in Example 1 and the siloxane polymer composite modified polymeric anticorrosive coating is replaced by the graphene oxide prepared in Example 2 and the siloxane polymer composite modified polymeric anticorrosive coating.

[0087] Application Example 3

[0088] The difference from Application Example 1 is that the graphene oxide prepared in Example 1 and the siloxane polymer composite modified polymeric anticorrosive coating is replaced by the graphene oxide prepared in Example 3 and the siloxane polymer composite modified polymeric anticorrosive coating.

[0089] Comparative Application Example 1

[0090] The difference from Application Example 1 is that the graphene oxide prepared in Example 1 and the siloxane polymer composite modified polymeric anticorrosive coating is replaced by the coating prepared in Comparative Example 1.

[0091] Comparative Application Example 2

[0092] The difference from Application Example 1 is that the graphene oxide prepared in Example 1 and the siloxane polymer composite modified polymeric anticorrosive coating is replaced by the coating prepared in Comparative Example 2.

[0093] Comparative Application Example 3

[0094] The difference from Application Example 1 is that the graphene oxide prepared in Example 1 and the siloxane polymer composite modified polymeric anticorrosive coating is replaced by the coating prepared in Comparative Example 3.

[0095] Performance Test

[0096] (1) The contact angles of the coated steel bars prepared in Examples 1-3 and the coated steel bars prepared in Example 1 were tested. The contact angles were measured using a Pinzhichuangsi PZ-1000 large-platform contact angle meter. The volume of deionized water measured each time was 3 μL. The results are as follows: Figure 1 As shown.

[0097] Depend on Figure 1 As can be seen, with the increase of hydrophobic modifier dosage, the contact angle of the coating gradually increases. Application Example 1 reaches the hydrophobic stage (90-120°), while Application Examples 2 and 3 reach the superhydrophobic stage (120-150°). This indicates that the aluminosilicate structure of the hydrophobically modified graphene oxide-geopolymer coating has been fully grafted with a large number of methyl groups, giving it good hydrophobicity.

[0098] (2) The coated steel bars prepared using Examples 1-3, the coated steel bars prepared using Example 1 (comparative), and the uncoated steel bars were subjected to neutral salt spray testing. The neutral salt spray test was conducted using a composite salt spray chamber where the coated steel bars were sprayed with a 5% sodium chloride solution for 14 days. The results are as follows: Figure 2 As shown in Table 1.

[0099] Table 1 Mass loss rate of coated steel bars after salt spray test

[0100]

[0101] from Figure 2 As shown in Table 1, the results indicate that compared to control example 1, application examples 1 and 2 showed only a small amount of rust on the surface of the coated steel bars, with a significantly reduced degree of corrosion. Application example 2 exhibited the lowest mass loss rate, decreasing by 98% compared to the uncoated steel bar. This is attributed to the hydrophobic modification of the coating, which effectively prevents chloride ions carried by water molecules from entering, thus preventing chloride corrosion of the steel bar. However, when an excessive amount of hydrophobic agent was added, the coated steel bar in application example 3 exhibited blocky corrosion, with a mass loss rate close to that of control example 1. This indicates a decrease in corrosion resistance in application example 3. This is because excessive hydrophobic groups reduce the hydration degree of the geopolymer, causing the high-polymerization-degree aluminosilicate structure to transform into a low-polymerization-degree structure, weakening the density of the graphene oxide-geopolymer coating, thereby leading to localized corrosion of the coated steel bar.

[0102] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. The use of graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating in the corrosion protection of steel, characterized in that, The preparation method of the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating is as follows in terms of mass fraction: 4g of sodium hydroxide was dissolved in 40g of deionized water to obtain a sodium hydroxide solution; the sodium hydroxide solution was mixed with 60g of water glass with a modulus of 2.2M, stirred at 400rpm for 10min, and left to stand for 24h to obtain an alkali activator with a concentration of 1.5M; 0.1125 g of graphene oxide having a specific surface area of 400 m 2 / g, 1 layer, a flake diameter of 0.2 μm was mixed with 94 g of an alkali activator and stirred at 800 rpm for 1 min in a magnetic stirrer, 0.1125 g of a polycarboxylic acid water reducer was then added to improve the dispersibility of the graphene oxide, and stirring was continued at 800 rpm for 4 min, finally, it was ultrasonically dispersed for 60 min using a power of 120 W to obtain a graphene oxide dispersion liquid; 6g of polydimethylsiloxane with a number average molecular weight of 80,000 and 0.3g of silane coupling agent KH550 were sequentially added to 10g of the alkali activator, mixed, and hydrolyzed by stirring at 1000rpm for 10min in a magnetic stirrer to obtain a hydrophobic modifier; 75g of fly ash, 45g of slag, 30g of metakaolin, 3g of polyvinyl alcohol powder, and 7.5g of titanium white powder were weighed into a stirring container, stirred and mixed at 60rpm for 2min to obtain a mixed powder, then the graphene oxide dispersion liquid and 0.75g of a silicone oil type defoaming agent were poured into the mixed powder, stirred and mixed at 100rpm for 2min, and finally the hydrophobic modifier was added and stirred and mixed again at 100rpm for 2min to obtain the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating; The fly ash contains 5% calcium and has a particle size of 50μm; the slag contains 47% calcium and has a particle size of 10μm; the metakaolin is obtained by calcining kaolin at a temperature of 800℃ for 60min and has a particle size of 5μm; the polyvinyl alcohol powder has a particle size of 100μm and a number average molecular weight of 100,000Mn; and the titanium white powder has a particle size of 1μm and is used for building coatings, and its main component is rutile titanium dioxide.

2. A process for the preparation of a hydrophobic polymer inorganic anticorrosive coating characterized in that, The method comprises the following steps: The graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating is applied to the surface of steel materials, dried, and a hydrophobic polymeric inorganic anticorrosive coating is obtained; The graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating is the graphene oxide and siloxane polymer composite modified polymeric anticorrosive coating used in the application of claim 1.

3. The method of claim 2, wherein, The coating is spraying; the diameter of the nozzle used in the spraying is 2-4 mm; the pressure of the spraying is 3-5 MPa; the distance between the nozzle used in the spraying and the steel material is 12-18 cm; the time of the spraying is 10-15 s; the coating amount of the spraying is 0.2-0.3 g / cm 2 .

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