A kind of corrosion-resistant environmentally friendly coating and preparation method thereof

Abstract

The present invention belongs to the technical field of coatings, and provides a corrosion-resistant and environmentally friendly coating and a preparation method thereof. The corrosion-resistant and environmentally friendly coating provided by the present invention comprises the following components in parts by weight: 50 to 70 parts of modified inorganic silicon solution, 20 to 40 parts of filler, 1 to 5 parts of dispersant, 1 to 5 parts of coupling agent, and 1 to 5 parts of thickening thixotropic agent; the modified inorganic silicon solution comprises silicic acid, amino acid, polysaccharide and water, and the mass ratio thereof is 3 to 5: 1 to 3: 1 to 3: 5 to 10; the amino acid is serine or threonine. The corrosion-resistant and environmentally friendly coating provided by the present invention has the advantages of impact resistance, oxidation resistance, corrosion resistance, waterproof and moisture-proof, fast self-drying, strong adhesion and long service life, and can be applied to pipelines used in underground work without causing damage to the soil environment.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a corrosion-resistant and environmentally friendly coating and a preparation method thereof. Background Art

[0002] Paint refers to a type of liquid or solid material that can form a thin film on the surface of an object under certain conditions to provide protection, decoration or other special functions (insulation, rust prevention, mildew prevention, heat resistance, etc.). Paint has four main functions: protection, decoration, concealing product defects and other special functions, and enhancing product value. With the rapid development of the economy, people's environmental awareness is also increasing day by day, so environmentally friendly paint has gradually become the mainstream.

[0003] Soil corrosion is the corrosion of metals in soil. Soil is a special solid electrolyte with capillary porosity. The cathode process of soil corrosion is mainly oxygen depolarization. Since oxygen needs to pass through the solid microporous electrolyte to reach the cathode, the process is relatively complicated and slow, and the structure and humidity of the soil have a great influence on the flow of oxygen.

[0004] At present, with the gradual deepening of the country's modern construction, underground projects are increasing rapidly. For example, the arm guards used in the construction of underground distillation towers, the gas pipelines of the West-East Gas Transmission Project, etc., all require anti-corrosion measures, and the preferred anti-corrosion materials cannot cause damage to the soil.

[0005] Therefore, how to provide an environmentally friendly protective coating that can protect underground working pipelines from corrosion has become a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, the present invention provides a corrosion-resistant and environmentally friendly coating and a preparation method thereof, the purpose of which is to solve the technical problem that underground pipelines are easily corroded.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] The present invention provides a corrosion-resistant and environmentally friendly coating, comprising the following components in parts by weight:

[0009] 50-70 parts of modified inorganic silicone solution, 20-40 parts of filler, 1-5 parts of dispersant, 1-5 parts of coupling agent, 1-5 parts of thickening thixotropic agent;

[0010] The modified inorganic silicon solution comprises silicic acid, amino acid, polysaccharide and water, wherein the mass ratio of silicic acid, amino acid, polysaccharide and water is 3-5:1-3:1-3:5-10; and the amino acid is serine or threonine.

[0011] Furthermore, the preparation steps of the modified inorganic silicon solution are as follows:

[0012] The modified inorganic silicon solution is obtained by mixing silicic acid, amino acid, polysaccharide and water and reacting them.

[0013] Furthermore, the mixing is carried out in a stirring manner, and the stirring time is 0.5 to 1 hour; the reaction temperature is 40 to 80° C., and the reaction time is 1 to 3 hours.

[0014] Furthermore, the filler is one or more of titanium dioxide, aluminum oxide, copper oxide, fly ash, diatomaceous earth and bentonite.

[0015] Furthermore, the polysaccharide is one or more of starch, gum arabic, chitin and agar.

[0016] Furthermore, the dispersant is one or more of polyurethane, polyacrylamide, sodium polyacrylate and polyoxyethylene alkylphenol ether.

[0017] Furthermore, the coupling agent is a silane coupling agent and / or a titanate coupling agent.

[0018] Furthermore, the thickening thixotropic agent is one or more of fumed silica, castor oil and polyamide wax.

[0019] The present invention provides a method for preparing the above-mentioned corrosion-resistant and environmentally friendly coating, comprising the following steps:

[0020] S1, mixing the filler, the dispersant and the first part of the modified inorganic silicon solution to obtain a mixed solution A;

[0021] S2, mixing the coupling agent with the mixed solution A to obtain a mixed solution B;

[0022] S3. Mix the remaining modified inorganic silicone solution, thickening thixotropic agent and mixed solution B to obtain a corrosion-resistant and environmentally friendly coating.

[0023] Furthermore, the mixing temperature in step S1, step S2 and step S3 is independently 40-60°C, and the mixing time is independently 20-60 minutes; the volume ratio of the first part of modified inorganic silicon solution to the remaining part of modified inorganic silicon solution is 3-4:1.

[0024] It can be seen from the above technical solution that compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] In the present invention, no toxic components and organic solvents are used, which meets the requirements of environmental protection;

[0026] In the present invention, the modified inorganic silicon solution adopts a mixed solution of silicic acid, amino acid, polysaccharide and water. The molecular structure of the modified inorganic silicon solution is an inorganic structure. The inorganic modified solution film is denser, has stronger adhesion, is pollution-free to the environment, has a long service life, and has both physical and chemical anti-corrosion effects.

[0027] In the present invention, the fillers are all cheap and readily available materials, and the oxides therein can accelerate the drying of the film and improve the construction efficiency. DETAILED DESCRIPTION

[0028] The present invention provides a corrosion-resistant and environmentally friendly coating, comprising the following components in parts by weight:

[0029] 50-70 parts of modified inorganic silicone solution, 20-40 parts of filler, 1-5 parts of dispersant, 1-5 parts of coupling agent, and 1-5 parts of thickening thixotropic agent.

[0030] In the present invention, the amount of the modified inorganic silicon solution is preferably 55 to 65 parts, more preferably 58 to 62 parts.

[0031] In the present invention, the amount of the filler is preferably 25 to 36 parts, more preferably 30 to 35 parts.

[0032] In the present invention, the amount of the dispersant used is preferably 2 to 4 parts, more preferably 3 parts.

[0033] In the present invention, the amount of the coupling agent is preferably 2 to 4 parts, more preferably 3 parts.

[0034] In the present invention, the amount of the thickening thixotropic agent is preferably 2 to 4 parts, more preferably 3 parts.

[0035] In the present invention, the modified inorganic silicon solution includes silicic acid, amino acid, polysaccharide and water, and the mass ratio of silicic acid, amino acid, polysaccharide and water is 3-5:1-3:1-3:5-10, preferably 4:2:2:6-8, and further preferably 4:2:2:7; the amino acid is serine or threonine, preferably serine.

[0036] In the present invention, the preparation steps of the modified inorganic silicon solution are as follows:

[0037] The modified inorganic silicon solution is obtained by mixing silicic acid, amino acid, polysaccharide and water and reacting them.

[0038] In the present invention, the mixing is carried out by stirring for 0.5 to 1 h, preferably 0.6 to 0.9 h, and more preferably 0.7 to 0.8 h; the reaction temperature is 40 to 80°C, preferably 50 to 70°C, and more preferably 60 to 65°C; the reaction time is 1 to 3 h, and more preferably 2 h.

[0039] In the present invention, the filler is one or more of titanium dioxide, alumina, copper oxide, fly ash, diatomaceous earth and bentonite, preferably one or more of titanium dioxide, alumina, copper oxide, fly ash and bentonite, and further preferably one or more of titanium dioxide, alumina, fly ash and bentonite.

[0040] In the present invention, the polysaccharide is one or more of starch, gum arabic, chitin or agar, preferably one or more of starch, chitin and agar, and more preferably one or more of starch and / or agar.

[0041] In the present invention, the dispersant is one or more of polyurethane, polyacrylamide, sodium polyacrylate and polyoxyethylene alkylphenol ether, preferably one or more of polyurethane, polyacrylamide and polyoxyethylene alkylphenol ether, more preferably polyurethane and / or polyoxyethylene alkylphenol ether.

[0042] In the present invention, the coupling agent is a silane coupling agent and / or a titanate coupling agent. The silane coupling agent is preferably one or more of KH550, KH560, KH570 and KH792, and more preferably one or more of KH560, KH570 and KH792; the titanate coupling agent is preferably one or more of TMC-102, TMC-201, TMC-105, TMC-311w and TMC-TTS, and more preferably one or more of TMC-102, TMC-105 and TMC-TTS.

[0043] In the present invention, the thickening thixotropic agent is one or more of fumed silica, castor oil and polyamide wax, preferably fumed silica and / or polyamide wax, and more preferably polyamide wax.

[0044] The present invention provides a method for preparing the above-mentioned corrosion-resistant and environmentally friendly coating, comprising the following steps:

[0045] S1, mixing the filler, the dispersant and the first part of the modified inorganic silicon solution to obtain a mixed solution A;

[0046] S2, mixing the coupling agent with the mixed solution A to obtain a mixed solution B;

[0047] S3. Mix the remaining modified inorganic silicone solution, thickening thixotropic agent and mixed solution B to obtain a corrosion-resistant and environmentally friendly coating.

[0048] In the present invention, the mixing temperature in step S1, step S2 and step S3 is independently 40-60°C, preferably 45-55°C, and more preferably 48-52°C; the mixing time is independently 20-60min, preferably 30-50min, and more preferably 35-40min; the volume ratio of the first part of modified inorganic silicon solution to the remaining part of modified inorganic silicon solution is 3-4:1, preferably 3:1.

[0049] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0050] Example 1

[0051] Silicic acid, threonine, starch and water were mixed in a mass ratio of 4:2:2:7 for 0.5 h, and then reacted at 60° C. for 2 h to obtain a modified inorganic silicon solution.

[0052] Mix 24 parts of filler (titanium dioxide, aluminum oxide, copper oxide, fly ash, diatomaceous earth and bentonite in equal quantities), 3 parts of polyurethane, 1 part of polyacrylamide and 40 parts of modified inorganic silicon solution at 40°C for 30 minutes to obtain mixed solution A; mix 2 parts of KH550 and 2 parts of KH560 with mixed solution A at 40°C for 30 minutes to obtain mixed solution B; mix 10 parts of modified inorganic silicon solution, 3 parts of fumed silica and mixed solution B at 40°C for 30 minutes to obtain corrosion-resistant and environmentally friendly coating.

[0053] Example 2

[0054] Silicic acid, serine, gum arabic and water were mixed in a mass ratio of 4:2:1:6 for 0.8 h, and then reacted at 70° C. for 1 h to obtain a modified inorganic silicon solution.

[0055] Mix 30 parts of filler (the mass of titanium dioxide, aluminum oxide, copper oxide, fly ash, diatomaceous earth and bentonite is equal), 2 parts of sodium polyacrylate, 2 parts of polyoxyethylene alkylphenol ether and 40 parts of modified inorganic silicon solution at 50°C for 30 minutes to obtain mixed solution A; mix 2 parts of KH560 and 1 part of KH570 with mixed solution A at 50°C for 30 minutes to obtain mixed solution B; mix 10 parts of modified inorganic silicon solution, 2 parts of polyamide wax and mixed solution B at 50°C for 30 minutes to obtain corrosion-resistant and environmentally friendly coating.

[0056] Example 3

[0057] Silicic acid, serine, agar and water were mixed in a mass ratio of 5:3:2:8 for 1 h, and then reacted at 70°C for 2 h to obtain a modified inorganic silicon solution.

[0058] Mix 36 parts of filler (titanium dioxide, aluminum oxide, copper oxide, fly ash, diatomaceous earth and bentonite in equal quantities), 1 part of polyurethane, 3 parts of polyoxyethylene alkylphenol ether and 40 parts of modified inorganic silicon solution at 55°C for 40 minutes to obtain mixed solution A; mix 2 parts of KH570, 2 parts of KH792 with mixed solution A at 55°C for 40 minutes to obtain mixed solution B; mix 10 parts of modified inorganic silicon solution, 1 part of castor oil, 2 parts of polyamide wax and mixed solution B at 55°C for 40 minutes to obtain corrosion-resistant and environmentally friendly coating.

[0059] Comparative Example 1

[0060] In this comparative example, no amino acid was added, and the remaining steps were the same as those in Example 1.

[0061] Comparative Example 2

[0062] In this comparative example, no polysaccharide was added, and the remaining steps were the same as those in Example 1.

[0063] The performance tests of the corrosion-resistant and environmentally friendly coatings prepared in Comparative Examples 1 to 2 and Examples 1 to 3 are shown in Table 1.

[0064] Table 1 Performance test results of coatings

[0065]

[0066]

[0067] Among them, film-forming performance test: one-time brushing; accelerated aging performance test: copper salt spray test, test temperature 50°C; corrosion resistance: 5% hydrochloric acid, 15 days.

[0068] It can be seen from Table 1 that the corrosion-resistant and environmentally friendly coating prepared by the present invention has a denser film, stronger adhesion, higher hardness, better anti-corrosion effect, can be better applied to pipelines used in underground work, and will not cause damage to the soil environment.

[0069] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0070] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A corrosion-resistant and environmentally friendly coating, characterized in that: It is composed of the following components in parts by weight: 50-70 parts of modified inorganic silicone solution, 20-40 parts of filler, 1-5 parts of dispersant, 1-5 parts of coupling agent, 1-5 parts of thickening thixotropic agent; The modified inorganic silicon solution comprises silicic acid, amino acid, polysaccharide and water, wherein the mass ratio of silicic acid, amino acid, polysaccharide and water is 3-5:1-3:1-3:5-10; the amino acid is serine or threonine; The polysaccharide is one or more of starch, gum arabic, chitin and agar.

2. The corrosion-resistant and environmentally friendly coating according to claim 1, characterized in that: The preparation steps of the modified inorganic silicon solution are as follows: The modified inorganic silicon solution is obtained by mixing silicic acid, amino acid, polysaccharide and water and reacting them.

3. The corrosion-resistant and environmentally friendly coating according to claim 2, characterized in that: The mixing is carried out in a stirring manner, and the stirring time is 0.5-1h; the reaction temperature is 40-80°C, and the reaction time is 1-3h.

4. The corrosion-resistant and environmentally friendly coating according to any one of claims 1 to 3, characterized in that: The filler is one or more of titanium dioxide, aluminum oxide, copper oxide, fly ash, diatomaceous earth and bentonite.

5. The corrosion-resistant and environmentally friendly coating according to claim 4, characterized in that: The dispersant is one or more of polyurethane, polyacrylamide, sodium polyacrylate and polyoxyethylene alkylphenol ether.

6. The corrosion-resistant and environmentally friendly coating according to claim 2 or 5, characterized in that: The coupling agent is a silane coupling agent and / or a titanate coupling agent.

7. The corrosion-resistant and environmentally friendly coating according to claim 6, characterized in that: The thickening thixotropic agent is one or more of fumed silica, castor oil and polyamide wax.

8. The method for preparing the corrosion-resistant and environmentally friendly coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, mixing the filler, the dispersant and the first part of the modified inorganic silicon solution to obtain a mixed solution A; S2, mixing the coupling agent with the mixed solution A to obtain a mixed solution B; S3. Mix the remaining modified inorganic silicone solution, thickening thixotropic agent and mixed solution B to obtain a corrosion-resistant and environmentally friendly coating.

9. The preparation method according to claim 8, characterized in that: The mixing temperatures in step S1, step S2 and step S3 are independently 40-60°C, and the mixing time is independently 20-60 minutes; the volume ratio of the first part of the modified inorganic silicon solution to the remaining part of the modified inorganic silicon solution is 3-4:1.

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