CN114149723A - Corrosion-resistant coating for steel pipe and preparation method and application thereof - Google Patents
Corrosion-resistant coating for steel pipe and preparation method and application thereof Download PDFInfo
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- CN114149723A CN114149723A CN202210005933.4A CN202210005933A CN114149723A CN 114149723 A CN114149723 A CN 114149723A CN 202210005933 A CN202210005933 A CN 202210005933A CN 114149723 A CN114149723 A CN 114149723A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/04—Antistatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a corrosion-resistant coating for a steel pipe and a preparation method and application thereof, wherein the coating comprises 50-70 parts of epoxy resin, 10-15 parts of antirust agent, 2-3 parts of carbon nano tube, 3-5 parts of glass flake, 2-4 parts of mullite powder, 6-10 parts of curing agent and 4-8 parts of coupling agent, the carbon nano tube, the glass flake, the mullite powder and the coupling agent are respectively weighed according to a proportion and then uniformly mixed; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating. The invention provides a corrosion-resistant coating for a steel pipe and a preparation method and application thereof, and the obtained coating has the advantages of simple preparation process, convenience in use, good coating performance and good corrosion-resistant effect.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention of steel pipes, and particularly relates to a corrosion-resistant coating for a steel pipe, and a preparation method and application thereof.
Background
The steel pipe can be taken off line after smelting, heating, perforating, continuous rolling, sizing, heat treatment and flaw detection in a steel plant, but the corrosion resistance of the steel pipe is relatively poor without any treatment, the service life of the steel pipe is short in the processes of storage, transportation and use, and the economical efficiency is poor. Therefore, it is a necessary process to perform an anticorrosive treatment on the steel pipe produced in a factory. In general, the steel pipe is subjected to corrosion prevention treatment such as surface alloy plating (such as zinc-containing passivation solution), surface phosphating, surface coating and the like; wherein, the surface coating process is relatively simple, has high economic value and is widely applied in actual production.
In the prior art, patent document CN102120909A provides an anticorrosive paint for steel pipes containing various resins, which contains organic substances as most components and relatively complex components; patent document CN109136851A discloses a steel pipe corrosion-resistant post-treatment process, and the disclosed antirust agent has relatively single component and insufficient actual corrosion resistance; patent document CN105170973A discloses a coating material, which is mainly made of alloy, can be coated only by high-temperature sintering, and is high in cost and inconvenient to use.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the corrosion-resistant coating for the steel pipe and the preparation method and application thereof, and the obtained coating has the advantages of simple preparation process, convenience in use, good coating performance and good corrosion-resistant effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in parts by weight:
preferably, the epoxy resin is CYD-128.
Preferably, the antirust agent is prepared from the following components in a mass ratio of 1: 0.4-0.7 of maleic acid-acrylic acid copolymer and phytic acid ester, wherein the molecular weight of the maleic acid-acrylic acid copolymer is 2200.
Preferably, the carbon nanotubes are milled prior to use.
Preferably, the glass flakes are C-type medium-alkali glass flakes, and the mesh number is 60-80 meshes.
Preferably, the coupling agent is KH-560.
Preferably, the curing agent is 650 polyamide.
Meanwhile, the invention also claims a preparation method of the coating, which comprises the following steps: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
Meanwhile, the invention also requests to protect the application of the coating in the corrosion-resistant post-treatment process of the steel pipe.
Preferably, the corrosion-resistant post-treatment process of the steel pipe comprises the following steps:
s1, polishing, degreasing and grinding the steel pipe to be processed, then washing with water and airing;
s2, carrying out acid washing on the steel pipe processed in the step S1, washing with clean water after acid washing, and airing;
s3, coating the inner and outer walls of the steel pipe processed in the step S2 with the prepared paint.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the steel pipe corrosion-resistant post-treatment process provided by the invention, the specific corrosion-resistant coating is sprayed at the corrosion-resistant treatment stage, and the coating material has good mechanical property, strong weather resistance and good corrosion resistance, so that the prepared steel pipe product has better corrosion resistance and long service life.
(2) In the corrosion-resistant post-treatment process for the steel pipe, the used corrosion-resistant coating takes the epoxy resin as a base material, a large number of epoxy groups in the epoxy resin are disordered and ordered, a system with a rich network structure can be formed, the film forming property is good, and the epoxy resin has certain thermoplasticity, so 650 polyamide is cooperatively used.
(3) In the corrosion-resistant coating provided by the invention, a small amount of carbon nano tubes are used, and the carbon nano tubes are ground firstly in the using process, so that the defects of easiness in agglomeration and difficulty in dispersion possibly existing in the characteristics of slender and large specific surface area are overcome; by using the carbon nano tube, the mechanical property and the weather resistance of the coating can be improved, the resistivity of the surface of the steel tube is reduced, and a certain antistatic effect is achieved.
(4) In the corrosion-resistant coating provided by the invention, glass flakes and mullite powder are also used, the glass flakes are regularly arranged in a coating system in a stratiform manner, the permeability resistance of the coating can be improved, and the absorptivity is reduced, and the applicant particularly shows that the 60-80-mesh C-type medium-alkali glass flakes have the best effect in practical research and possibly have a certain relation with the ageing resistance and weather resistance of the C-type medium-alkali glass flakes; and the wear resistance and the corrosion resistance of the coating can be further improved by adding a small amount of mullite powder with good thermal expansion performance.
(5) In the corrosion-resistant coating provided by the invention, a system formed by mixing the maleic acid-acrylic acid copolymer and the phytic acid ester is finally selected as a main preservative of the coating through repeated screening by the applicant, so that the material system is simple, but the effect is good. Wherein the maleic acid-acrylic acid copolymer contains abundant functional groups such as carboxyl and the like; the phytic acid ester has rich functional groups and can be chelated with rust ions, so that an oxide layer can be formed on the outer surface of the coating, and a better anti-corrosion effect is achieved. The combination of the two can improve the film forming property of the coating and play a significant role in corrosion prevention.
Always, the anti-corrosion coating provided by the invention can ensure that the anti-corrosion performance of the steel pipe is excellent and the service life of the steel pipe product is prolonged by a specific post-treatment process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It is to be noted that all the raw materials in the present invention are commercially available unless otherwise specified.
Example 1
The coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in mass:
wherein the antirust agent is prepared from the following components in a mass ratio of 1: 0.4 of maleic acid-acrylic acid copolymer having a molecular weight of 2200, and phytic acid ester.
Wherein, the carbon nano tube is ground before use.
Wherein the glass flakes are C-type medium-alkali glass flakes, and the mesh number is 70 meshes.
The embodiment also provides a preparation method of the coating, which comprises the following steps: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
Example 2
The coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in mass:
wherein the antirust agent is prepared from the following components in a mass ratio of 1: 0.5 of maleic acid-acrylic acid copolymer having a molecular weight of 2200, and phytic acid ester.
Wherein, the carbon nano tube is ground before use.
Wherein the glass flakes are C-type medium-alkali glass flakes, and the mesh number is 70 meshes.
The embodiment also provides a preparation method of the coating, which comprises the following steps: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
Example 3
The coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in mass:
wherein the antirust agent is prepared from the following components in a mass ratio of 1: 0.6 of maleic acid-acrylic acid copolymer having a molecular weight of 2200, and phytic acid ester.
Wherein, the carbon nano tube is ground before use.
Wherein the glass flakes are C-type medium-alkali glass flakes, and the mesh number is 70 meshes.
The embodiment also provides a preparation method of the coating, which comprises the following steps: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
Comparative example 1
The coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in mass:
wherein the antirust agent is maleic acid-acrylic acid copolymer, wherein the molecular weight of the maleic acid-acrylic acid copolymer is 2200.
Wherein, the carbon nano tube is ground before use.
Wherein the glass flakes are C-type medium-alkali glass flakes, and the mesh number is 70 meshes.
The comparative example also provides a method for preparing the coating, comprising the following steps: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
Comparative example 2
The coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in mass:
wherein the antirust agent is prepared from the following components in a mass ratio of 1: 0.4 of maleic acid-acrylic acid copolymer having a molecular weight of 2200, and phytic acid ester.
Wherein, the carbon nano tube is ground before use.
The comparative example also provides a method for preparing the coating, comprising the following steps: weighing the carbon nano tube and the coupling agent according to the proportion respectively, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
Comparative example 3
The coating for the corrosion-resistant post-treatment process of the steel pipe is prepared from the following raw materials in mass:
wherein the antirust agent is prepared from the following components in a mass ratio of 1: 0.4 of maleic acid-acrylic acid copolymer having a molecular weight of 2200, and phytic acid ester.
Wherein, the carbon nano tube is ground before use.
Wherein the glass flakes are E-type alkali-free glass flakes, and the mesh number is 70 meshes.
The comparative example also provides a method for preparing the coating, comprising the following steps: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
The coatings prepared in examples 1-3 and comparative examples 1-3 were subjected to performance tests, and specific test indexes and methods were as follows:
(1) paint Performance testing
The coatings prepared in examples 1-3 and comparative examples 1-3 of the invention were used to prepare plates under the same conditions, the thickness of the coating layer was 500 μm, and various performance data were tested. The test results are shown in 1.
(2) Actual steel pipe corrosion resistance test
The coatings prepared in the embodiments 1 to 3 and the comparative examples 1 to 3 of the invention are used for corrosion treatment of steel pipes (commercially available steel pipes are not subjected to corrosion treatment, and other performances meet related industrial standards) under the same conditions, and the treatment process comprises the following steps:
s1, polishing, degreasing and grinding the steel pipe to be processed, then washing with water and airing;
s2, carrying out acid washing on the steel pipe processed in the step S1, washing with clean water after acid washing, and airing;
s3, coating the inner and outer walls of the steel pipe processed in the step S2 with the prepared paint.
And carrying out a blue spot method test on the treated steel pipe according to GB/T25150-2010. The test results are shown in table 1.
TABLE 1
As can be seen from Table 1, the coating prepared by the invention has good corrosion resistance, can delay the corrosion probability of the steel pipe in actual use and prolong the service life of the steel pipe, and is superior to the performances of comparative examples 1-3.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The coating for the corrosion-resistant post-treatment process of the steel pipe is characterized by being prepared from the following raw materials in parts by weight:
2. the coating for the corrosion-resistant post-treatment process of the steel pipe as claimed in claim 1, wherein the epoxy resin is CYD-128.
3. The coating for the corrosion-resistant post-treatment process of the steel pipe as claimed in claim 1, wherein the rust inhibitor is prepared from the following components in a mass ratio of 1: 0.4-0.7 of maleic acid-acrylic acid copolymer and phytic acid ester, wherein the molecular weight of the maleic acid-acrylic acid copolymer is 2200.
4. The coating for the corrosion-resistant post-treatment process of the steel pipe as claimed in claim 1, wherein the carbon nanotubes are ground before use.
5. The coating for the corrosion-resistant post-treatment process of the steel pipe as claimed in claim 1, wherein the glass flakes are C-type medium-alkali glass flakes, and the mesh number is 60-80 meshes.
6. The coating for a steel pipe corrosion-resistant post-treatment process according to claim 1, wherein the coupling agent is KH-560.
7. The coating for a steel pipe corrosion-resistant post-treatment process according to claim 1, wherein the curing agent is 650 polyamide.
8. A method for preparing the coating of any one of claims 1 to 7, comprising the steps of: respectively weighing the carbon nano tube, the glass flake, the mullite powder and the coupling agent in proportion, and then uniformly mixing; and then adding the epoxy resin, the antirust agent and the curing agent according to the proportion, and uniformly stirring again to obtain the coating.
9. Use of the coating according to any one of claims 1 to 7 in a process for corrosion-resistant post-treatment of steel pipes.
10. Use according to claim 9, characterized in that the process of corrosion-resistant post-treatment of steel pipes comprises the following steps:
s1, polishing, degreasing and grinding the steel pipe to be processed, then washing with water and airing;
s2, carrying out acid washing on the steel pipe processed in the step S1, washing with clean water after acid washing, and airing;
s3, coating the inner and outer walls of the steel pipe processed in the step S2 with the prepared paint.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210005933.4A CN114149723B (en) | 2022-01-05 | 2022-01-05 | Corrosion-resistant coating for steel pipe and preparation method and application thereof |
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| CN202210005933.4A CN114149723B (en) | 2022-01-05 | 2022-01-05 | Corrosion-resistant coating for steel pipe and preparation method and application thereof |
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| CN114149723B CN114149723B (en) | 2022-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116475044A (en) * | 2023-04-17 | 2023-07-25 | 江苏吉福新材料股份有限公司 | Wooden door surface treatment process |
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| CN116475044A (en) * | 2023-04-17 | 2023-07-25 | 江苏吉福新材料股份有限公司 | Wooden door surface treatment process |
| CN116475044B (en) * | 2023-04-17 | 2023-10-13 | 江苏吉福新材料股份有限公司 | Wooden door surface treatment process |
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