CN117777852A - High-temperature-resistant heavy-duty anticorrosive composite coating and preparation method thereof - Google Patents
High-temperature-resistant heavy-duty anticorrosive composite coating and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of paint coatings, and discloses a high-temperature-resistant heavy-duty anticorrosive composite coating and a preparation method thereof. The high-temperature-resistant heavy-duty anticorrosive composite coating comprises a primer coating and a finish coating, wherein the primer coating is prepared from raw materials such as organic silicon resin, high-temperature-resistant acrylic resin, glass powder and the like, and the finish coating is coated on the primer coating in a wet-on-wet mode; the composite coating prepared by the invention can realize quick self-drying at normal temperature and long-acting heavy corrosion prevention, can keep salt fog resistance for more than 1200 hours after being used at a high temperature in a use environment of 200-600 ℃, and can realize a 'wet-on-wet' integrated coating process during construction.
Description
Technical Field
The invention relates to the technical field of paint coatings, in particular to a high-temperature-resistant heavy-duty anticorrosive composite coating and a preparation method thereof.
Background
In modern life, steel is widely applied to various fields, the service life of products is determined by the corrosion resistance, the research of the corrosion-resistant coating is an important direction of coating workers, however, the application of common corrosion-resistant coating is limited by high-temperature use environment, and particularly, a high-temperature-resistant heavy corrosion-resistant coating is required for the high-temperature high-salt marine environment. At present, the temperature resistance of the common organosilicon high-temperature resistant paint is 200-400 ℃, most of the paint needs high-temperature baking and curing, the salt spray resistance is about 1000H, and the salt spray resistance of the coating is obviously reduced after high-temperature baking and is easy to corrode. In the construction process, the construction interval between the high-temperature resistant primer and the finishing paint is generally 24 hours, and the construction period is long. In the existing high temperature resistant paint system, the salt spray performance test is generally aimed at the salt spray test after coating, the salt spray test after high temperature is not carried out in the simulated reality application environment, and the 'wet on wet' integrated coating of the primer and the finish paint is freshly reported.
Therefore, there is a need for a high temperature resistant heavy duty composite coating that addresses the above-described problems.
Disclosure of Invention
Based on the above, the invention aims to provide the high-temperature-resistant heavy-duty composite coating, which realizes normal-temperature quick self-drying and long-acting heavy-duty corrosion resistance, can keep salt fog resistance for more than 1200 hours after being used at a high temperature in a use environment of 200-600 ℃, and can realize a 'wet-on-wet' integrated coating process in construction.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a high temperature resistant heavy duty composite coating comprising: including primer coatings and topcoat coatings;
the primer coating comprises the following raw materials in parts by mass:
35-40 parts of organic silicon resin, 5-10 parts of high temperature resistant acrylic resin, 3-10 parts of solvent, 0.1-1 part of dispersing agent, 0.1-1 part of defoamer, 0.4-1 part of anti-settling agent, 3-6 parts of talcum powder, 10-20 parts of glass powder and 25-35 parts of zinc powder;
the finish paint coating comprises the following raw materials in parts by mass:
40-50 parts of organic silicon resin, 5-10 parts of high temperature resistant acrylic resin, 3-10 parts of solvent, 0.1-1 part of dispersing agent, 0.1-1 part of defoaming agent, 0.4-1 part of anti-settling agent, 10-20 parts of titanium dioxide, 0.2-1 part of copper-chromium black, 3-8 parts of mica powder and 10-20 parts of glass powder.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the thickness of the top coating and the thickness of the primer coating are both 30-50 mu m.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the organic silicon resin comprises one or more of methyl phenyl silicone resin, methyl silicone resin and epoxy modified organic silicon resin;
as a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the organic silicon resin of the primer coating comprises 5-10 parts of epoxy modified organic silicon resin and 30-35 parts of methyl phenyl silicone resin; preferably, the ratio of the epoxy modified silicone resin to the methylphenyl silicone resin is 1:4;
the silicone resin of the topcoat is preferably methyl phenyl silicone resin.
As a preferable scheme of the high-temperature-resistant heavy-duty anticorrosive composite coating, the high-temperature-resistant acrylic resin is a special modified monomer modified acrylic resin, is in a solid state at normal temperature, can be dissolved in solvents such as esters, aromatic hydrocarbons, ketones and the like, has high drying speed and high softening point, and has good weather resistance and corrosion resistance to chemical substances such as acid, alkali, salt and the like; preferably, it is a Zhanzhan resin C10.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the solvent comprises one or more of dimethylbenzene, trimethylbenzene, n-butyl alcohol and butyl acetate; the solvent can obviously reduce the viscosity of the coating, has good compatibility with other components, is suitable for construction in different climatic environments through different combinations, and provides the adaptability of products;
the solvent for the primer coating is preferably xylene: n-butanol=60:40;
the solvent of the top coat is preferably xylene: trimethylbenzene: butyl acetate=70:10:20.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the dispersing agent comprises one or two of BYK-163 and BYK-203; BYK-163 is preferred.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the defoamer comprises one or two of polysiloxane solution BYK-066N, TEGO-900;
the defoamer of the primer coating is preferably TEGO-900;
the defoamer of the topcoat is preferably TEGO-066N.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the anti-settling agent comprises one or more of fumed silica, organic bentonite and polyamide wax powder; the primer coating anti-settling agent is preferably a combination of silicon dioxide and polyamide wax powder.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the talcum powder has excellent high-temperature resistance and linear expansion coefficient, so that the flexibility of the coating is increased, the coating can bear cold and heat shock in the practical use environment, and a paint film is not damaged. The primer coating talcum powder is preferably OrtetAT-2000.
As a preferable scheme of the high-temperature-resistant heavy-duty anticorrosive composite coating, the glass powder comprises low-melting-point glass powder, the main component comprises silicon dioxide, the chemical property is stable, and the silicon-oxygen bond and the organic silicon resin can react and crosslink, so that the high-temperature-resistant composite coating is excellent; the optimized 1140 low-melting-point glass powder is preferable, and the glass powder is used as a filler in a use environment of 200-600 ℃, so that the mechanical property of a paint film is adjusted, and part of organosilicon of resin starts to carbonize along with the rise of temperature, and at the moment, the glass powder starts to melt and fill pores to form a compact insulating coating, so that the effects of high temperature resistance and heavy corrosion resistance are achieved.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the zinc powder is high-temperature-resistant zinc powder, and is an environment-friendly high-efficiency antirust pigment for electrochemically protecting steel; preferably Shen Long mesh high temperature resistant zinc powder.
As a preferable scheme of the high-temperature-resistant heavy-duty composite coating, the titanium dioxide has better high-temperature stability, does not decompose at high temperature and does not change color, provides the covering property of the coating, and simultaneously improves the heat resistance of the coating; duPont R706 is preferred.
As a preferable scheme of the high-temperature-resistant heavy-duty anticorrosive composite coating, the copper-chromium black is synthesized by mixing a plurality of metal oxides and then carrying out high-temperature solid phase reaction, and has the characteristics of environmental protection, no toxicity, high temperature resistance, acid-base resistance, solvent resistance, chemical stability and the like; preferably Hunan giant copper chrome black JF-A2854.
As a preferable scheme of the high-temperature-resistant heavy-duty anticorrosive composite coating, the mica powder is silicate with a layered structure, has good toughness and stable chemical property, is stable in a high-temperature environment, can bear cold and hot impact of an external environment without cracking, and can prevent invasion of substances such as water, acid, alkali, salt and the like to improve the weather resistance of the coating; preferably, the material is Gray GA-5.
The preparation method of the high-temperature-resistant heavy-duty anticorrosive composite coating comprises the following steps of:
dispersing organic silicon resin, high-temperature-resistant acrylic resin, solvent, dispersing agent and defoaming agent at 600-800 r/min for 5-15 min, uniformly mixing, adding anti-settling agent, talcum powder and glass powder while dispersing at 600-800 r/min, dispersing at 1000-1200 r/min for 25-35 min after adding to fully activate the anti-settling agent, grinding to fineness below 40 mu m, adding zinc powder at 600-800 r/min for dispersing for 10-20 min, and packaging after uniform dispersion to obtain a primer coating;
dispersing organic silicon resin, high-temperature-resistant acrylic resin, solvent, dispersing agent and defoaming agent at the speed of 600-800 r/min for 5-15 min, adding anti-settling agent, titanium pigment, copper-chromium black, mica powder and glass powder while dispersing at the speed of 600-800 r/min, dispersing at the high speed of 1000-1200 r/min for 25-35 min after adding to fully activate the anti-settling agent, and packaging with the grinding fineness of 30 μm below after uniform dispersion to obtain a finish paint coating;
and coating the finish paint coating on the primer coating in a wet-on-wet mode to obtain the composite coating.
The beneficial effects of the invention include:
first, the invention utilizes the synergistic protection of the high temperature resistant heavy anti-corrosion primer and the high temperature resistant heavy anti-corrosion finish paint to ensure that the heavy anti-corrosion performance is more excellent, wherein the Gao Wenchong resistant anti-corrosion primer improves the high temperature resistant heavy anti-corrosion protection for the steel base material, and the high temperature resistant heavy anti-corrosion finish paint protects the high temperature resistant heavy anti-corrosion primer and decorates the color, thereby further protecting the steel base material.
Secondly, the composite coating prepared by the invention adopts three resins as film forming substances, has good film forming performance at 0-200 ℃ for high-temperature resistant acrylic resin, and overcomes the defect of insufficient film forming crosslinking degree of organic silicon resin and low-temperature glass powder in the temperature section; at 200-400 ℃, the carbonization performance of the high-temperature resistant acrylic resin begins to be reduced, and the film forming performance of the organic silicon resin is improved at the temperature section, so that the organic silicon resin becomes a main film forming substance; carbonizing organic groups of the high-temperature resistant resin and the organic silicon resin at 400-600 ℃, and melting and forming a film by using low-melting glass powder to form a compact coating; namely, the film forming substances cooperate with each other, so that the coating is suitable for environments with different use temperatures, and the salt spray resistance of the composite coating is more than 1200h before and after high-temperature baking at different temperature ranges of 200-600 ℃.
Thirdly, the composite coating prepared by the invention has high drying speed of a paint film and small stress difference between a primer and a finish paint, can realize wet-on-wet coating, improves the working efficiency and reduces the comprehensive cost.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. This invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention is further illustrated by the following examples.
Examples a Gao Wenchong corrosion resistant primer was formulated according to the parts by weight of table 1.
TABLE 1 Table of the mass fractions of the different formulations
The preparation process of the primer coating comprises the following steps: firstly, adding organic silicon resin, high-temperature-resistant acrylic resin, a solvent, a dispersing agent and a defoaming agent into a clean dispersing kettle, dispersing for 5-15 min (each formula can respectively adopt 600r/min, 700r/min and 800r/min, the same applies hereinafter), uniformly mixing, adding an anti-settling agent, talcum powder and glass powder while dispersing for 600-800 r/min, increasing the speed to 1000-1200 r/min (each formula can respectively adopt 1000r/min, 1100r/min and 1200 r/min), dispersing for 25-35 min (each formula can respectively adopt 25min, 30min and 35 min), fully activating the anti-settling agent (the temperature is controlled to be 50-65 ℃), grinding zinc powder to a fineness of 40 mu m by grinding equipment after uniform dispersion, and finally transferring into the dispersing kettle, dispersing for 600-800 r/min while dispersing for 10-20 min (each formula can respectively adopt 10min, 15min and 20 min), and packaging after uniform dispersion.
Examples a Gao Wenchong corrosion resistant topcoat was formulated according to the parts by weight of table 2.
TABLE 2 Table of the mass fractions of the different formulations
The preparation process of the finish paint coating comprises the following steps: firstly, adding organic silicon resin, high-temperature resistant acrylic resin, a solvent, a dispersing agent and a defoaming agent into a clean dispersing kettle, uniformly mixing, adding an anti-settling agent, titanium pigment, copper chrome black, mica powder and glass powder while dispersing at 600-800 r/min (each formula can respectively adopt 600r/min, 700r/min and 800 r/min), and carrying out high-speed dispersion for 25-35 min (each formula can respectively adopt 1000r/min, 1100r/min and 1200 r/min) at the speed of 1000-1200 r/min (each formula can respectively adopt 25min, 30min and 35 min) so that the anti-settling agent is fully activated (the temperature is controlled to be 50-65 ℃), and then transferring the mixture into grinding equipment for grinding until the fineness is below 30 mu m for packaging after uniform dispersion.
The wet-on-wet construction process comprises the following steps: according to the construction conditions of most construction sites, the time interval from the finish paint mixing after the primer spraying to the finish paint spraying is generally more than 5 minutes, and in order to meet the test requirements, the laboratory test is carried out at the time interval of 3 minutes, namely, the spray coating of Gao Wenchong-resistant anti-corrosion finish paint is carried out 3 minutes after the spray coating of Gao Wenchong-resistant anti-corrosion primer, the spray coating of Gao Wenchong-resistant anti-corrosion primer with the dry film thickness of 30-50 mu m and the spray coating of Gao Wenchong-resistant anti-corrosion finish paint with the dry film thickness of 30-50 mu m. The construction test results show that the coating is smooth and uniform in color, and abnormal conditions such as foaming, delamination, wrinkling, sagging and the like do not occur. The wet-on-wet process improves the coating efficiency, reduces the cost of products due to the primer drying field, labor and the like, and reduces the comprehensive cost of the products.
Performance tests were performed on the high temperature resistant heavy duty primer formulations 1-8, the composite coating was tested on the high temperature resistant heavy duty topcoat formulation 1, the construction was performed on a wet-on-wet basis, and the specific test results are shown in table 3.
Table 3 Performance test results for high temperature resistant heavy duty primer formulations 1-8
Wherein the performance test was carried out by spraying the coating uniformly onto a polished steel plate or tin plate, the film thickness being applied at 40 μm with or without specification. The adhesive force is tested by a cross-cut method GB/T9286, the flexibility is tested by a GB/T1731 method, the impact resistance is tested by a GB/T1732 method, the heat resistance is tested by furnace cooling after heat preservation for 200 hours in a muffle furnace at 600 ℃, and the salt spray resistance is tested by a GB/T1771 method.
The components of the formula are different, the performance of the formula shows variability, in the primer formula, in the protection scope of the formula, the formulas 1 to 5 all have the salt spray resistance performance which can be kept for more than 1200 hours after the use at a high temperature in the use environment of 200 to 600 ℃, and the overall performance effect of the formula 1 is better. Comparison with other formulations: formulation 2 and formulation 4 show a slight decrease in salt spray performance due to slightly lower resin content; the zinc powder content in the formula 3 and the formula 5 is improved, and the salt spray resistance is slightly improved.
The formulas 6 to 8 are not in the protection range of the formulas, and can not keep the salt spray resistance of more than 1200 hours after being used at a high temperature in the use environment of 200-600 ℃, wherein zinc powder is not added in the formula 6, and the salt spray resistance of the coating is obviously reduced; the formula 7 is not added with high-temperature-resistant acrylic resin, so that the normal-temperature film forming property of a paint film is reduced, and the normal-temperature salt spray resistance is obviously reduced; the glass powder in the formula 8 has small addition amount, can not form a compact coating in a high-temperature environment, causes pulverization of a paint film after high temperature, and has no corrosion resistance.
Performance tests were performed on the high temperature resistant heavy duty topcoat formulations 1-7, the composite coating was tested on the high temperature resistant heavy duty primer formulation 1, the construction was performed on a wet-on-wet basis, and the specific test results are shown in table 4.
Table 4 Performance test results of high temperature resistant heavy duty topcoat formulations 1-7
The components of the formula are different, the performance of the formula shows variability, in the formula of the finish paint, in the range of the formula protection of the application, all the formulas 1 to 5 have the salt spray resistance performance which can be maintained for more than 1200 hours after the use at a high temperature in the use environment of 200-600 ℃, and the overall performance effect of the formula 1 is better. Comparison with other formulations: formula 4 of formula 3 has slightly better high-temperature salt spray resistance due to slightly more organic silicon resin content, but slightly less high-temperature acrylic resin and slightly worse normal-temperature salt spray resistance; the glass powder content in the formula 2 and the formula 5 is slightly less, and the salt spray resistance is reduced to a certain extent.
Formula 6 and formula 7 are not in the protection range of the formula, and can not keep the salt spray resistance for more than 1200 hours after being used at a high temperature in the use environment of 200-600 ℃, wherein the content of the organic silicon resin in formula 6 is smaller, the film formation is insufficient at the high temperature, and the corrosion of external substances can not be effectively shielded, so that the salt spray resistance of the coating is obviously reduced; the formula 7 has excessive addition of the organic silicon resin, and the stress difference between the Gao Wenchong corrosion-resistant finish paint and the high-temperature heavy corrosion-resistant primer is too large, so that the coating with inconsistent high-temperature shrinkage cracks and delaminates, and the coating has no corrosion resistance.
Therefore, the composite coating prepared from the raw materials adopted by the application can realize quick self-drying at normal temperature and long-acting heavy corrosion resistance, can keep the salt fog resistance for more than 1200 hours after being used at a high temperature in a use environment of 200-600 ℃, and can realize a wet-on-wet integrated coating process in construction.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The high-temperature-resistant heavy-duty anticorrosive composite coating is characterized by comprising a primer coating and a top-coat coating;
the primer coating comprises the following raw materials in parts by mass:
35-40 parts of organic silicon resin, 5-10 parts of high temperature resistant acrylic resin, 3-10 parts of solvent, 0.1-1 part of dispersing agent, 0.1-1 part of defoamer, 0.4-1 part of anti-settling agent, 3-6 parts of talcum powder, 10-20 parts of glass powder and 25-35 parts of zinc powder;
the finish paint coating comprises the following raw materials in parts by mass:
40-50 parts of organic silicon resin, 5-10 parts of high temperature resistant acrylic resin, 3-10 parts of solvent, 0.1-1 part of dispersing agent, 0.1-1 part of defoaming agent, 0.4-1 part of anti-settling agent, 10-20 parts of titanium dioxide, 0.2-1 part of copper-chromium black, 3-8 parts of mica powder and 10-20 parts of glass powder.
2. The high temperature resistant heavy duty composite coating of claim 1, wherein said topcoat and said primer coating are each 30-50 μm thick.
3. The high temperature resistant heavy duty composite coating of claim 1, wherein said silicone resin comprises one or more of methyl phenyl silicone, methyl silicone, epoxy modified silicone.
4. The high temperature resistant heavy duty composite coating according to claim 3, wherein the silicone resin of the primer coating comprises 5 to 10 parts of epoxy modified silicone resin and 30 to 35 parts of methyl phenyl silicone resin.
5. The high temperature resistant heavy duty composite coating of claim 1, wherein said solvent comprises one or more of xylene, trimethylbenzene, n-butanol, and butyl acetate.
6. The high temperature resistant heavy duty composite coating of claim 1, wherein said dispersant comprises one or both of BYK-163, BYK-203.
7. The high temperature resistant heavy duty composite coating of claim 1, wherein said defoamer comprises one or both of polysiloxane solution BYK-066N, TEGO-900.
8. The high temperature resistant heavy duty composite coating of claim 1, wherein said anti-settling agent comprises one or more of fumed silica, organobentonite, polyamide wax powder.
9. The high temperature resistant heavy duty composite coating of claim 1, wherein said glass frit comprises a low melting point glass frit and the major component comprises silica.
10. The method for preparing the high-temperature-resistant heavy-duty anticorrosive composite coating according to any one of claims 1 to 9, comprising the following steps:
dispersing organic silicon resin, high-temperature-resistant acrylic resin, solvent, dispersing agent and defoaming agent at 600-800 r/min for 5-15 min, uniformly mixing, adding anti-settling agent, talcum powder and glass powder while dispersing at 600-800 r/min, dispersing at 1000-1200 r/min for 25-35 min after adding to fully activate the anti-settling agent, grinding to fineness below 40 mu m, adding zinc powder at 600-800 r/min for dispersing for 10-20 min, and packaging after uniform dispersion to obtain a primer coating;
dispersing organic silicon resin, high-temperature-resistant acrylic resin, solvent, dispersing agent and defoaming agent at the speed of 600-800 r/min for 5-15 min, adding anti-settling agent, titanium pigment, copper-chromium black, mica powder and glass powder while dispersing at the speed of 600-800 r/min, dispersing at the high speed of 1000-1200 r/min for 25-35 min after adding to fully activate the anti-settling agent, and packaging with the grinding fineness of 30 μm below after uniform dispersion to obtain a finish paint coating;
and coating the finish paint coating on the primer coating in a wet-on-wet mode to obtain the composite coating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311683197.9A CN117777852A (en) | 2023-12-09 | 2023-12-09 | High-temperature-resistant heavy-duty anticorrosive composite coating and preparation method thereof |
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|---|---|---|---|
| CN202311683197.9A CN117777852A (en) | 2023-12-09 | 2023-12-09 | High-temperature-resistant heavy-duty anticorrosive composite coating and preparation method thereof |
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