CN113502096A - Low-cost color water-based super high temperature resistant coating prepared by self-crosslinking and sintering crosslinking, and preparation method and use method thereof - Google Patents

Low-cost color water-based super high temperature resistant coating prepared by self-crosslinking and sintering crosslinking, and preparation method and use method thereof Download PDF

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CN113502096A
CN113502096A CN202110676469.7A CN202110676469A CN113502096A CN 113502096 A CN113502096 A CN 113502096A CN 202110676469 A CN202110676469 A CN 202110676469A CN 113502096 A CN113502096 A CN 113502096A
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crosslinking
sintering
self
coating
high temperature
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CN113502096B (en
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张永生
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Foshan Shunde Boyi Anticorrosive Paint Technology Co ltd
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Foshan Shunde Boyi Anticorrosive Paint Technology Co ltd
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Abstract

The application provides a self-crosslinking and sintering crosslinking prepared low-cost color water-based super high temperature resistant coating, a preparation method and a use method thereof, the coating comprises 26-31% of organic silicon heat resistant resin, 8-13% of high temperature resistant pigment, 24-29% of self-crosslinking acrylic emulsion, 12-17% of filler, 4-6% of amino resin, 10.7-11.2% of sintering material, 0.6-1.0% of adhesion promoter, 1.5-2.8% of wetting dispersant and 1.2-2.3% of cooling stabilizer, the coating is cured into a film by adopting a self crosslinking and sintering crosslinking mode, the film is ceramic after the film is formed, the dispersed single-particle resin is melted, diffused and sintered into a compact whole, the coating can resist high temperature of 500-850 ℃ for a long time after being cured, the product has excellent heat resistance, good base material adhesion, high hardness, excellent wear resistance and good corrosion and weather resistance, the sintering crosslinking is adopted, so that the cost of the coating can be greatly reduced, the requirement on resin performance is reduced, the low-cost ultrahigh-temperature-resistant coating is prepared, and the coating can be widely applied to the fields of vehicle exhaust pipes of automobiles, motorcycles, tractors and the like, chimneys of thermal power plants, heating appliances, aerospace military industry and the like.

Description

Low-cost color water-based super high temperature resistant coating prepared by self-crosslinking and sintering crosslinking, and preparation method and use method thereof
Technical Field
The invention belongs to the technical field of high-temperature resistant coatings, and particularly relates to a low-cost color water-based super high-temperature resistant coating prepared by self-crosslinking and sintering crosslinking, and a preparation method and a use method thereof.
Background
The high-temperature resistant coating is a special functional coating, can be used at the temperature of more than 200 ℃ for a long time, keeps certain physical and chemical properties, enables a protected object to play a normal role in a certain high-temperature environment, is widely applied to high-temperature places such as motor vehicle engine spray pipes, steel chimneys, high-temperature pipelines, high-temperature furnace shells, petroleum cracking devices, tanks, cannons and the like, delays hot hydrogenation corrosion of metal equipment such as steel and the like at high temperature, ensures that the equipment can be used for a long time, has higher and higher requirements on high-temperature resistant coatings of the equipment along with the rapid development of modern industry, requires that a paint film does not change color or fall off at high temperature, and still can keep good physical and mechanical properties and corrosion resistance. However, most of the existing high-temperature resistant coatings adopt a self-crosslinking mode, the high-temperature resistant aim is achieved only by the resin performance, the requirements on the performance of the organic silicon resin are high when the high-temperature resistant coating can withstand high temperature, the specific gravity is large, the organic silicon resin is expensive, and the high-temperature resistant paint resistant to more than 500 ℃ is generally relatively high in cost. Therefore, it is very important to find a coating which has good high temperature resistance, can effectively improve the physical and mechanical properties of the coating and has low cost.
Disclosure of Invention
The invention aims to solve the technical problem of high temperature resistance of the existing coating, and provides a low-cost color water-based super high temperature resistant coating prepared by self crosslinking and sintering crosslinking.
The second purpose of the invention is to provide a preparation method for preparing the low-cost colored water-based super high temperature resistant coating by self-crosslinking and sintering crosslinking. The glass powder, the sericite, the bauxite powder and the kaolin have the condition of mutual reaction and ceramic treatment at high temperature, and have the performance of ultra-high temperature resistance. The self-crosslinking aqueous emulsion reacts with amino resin under low temperature by heating to form a flat and smooth paint film, and then glass powder, sericite and alunite powder are gradually ceramized under the control of a cooling stabilizer and a sintering material under the condition of gradually heating to form the double-crosslinking high-temperature-resistant paint.
The third purpose of the invention is to provide a use of self-crosslinking and sintering crosslinking for preparing low-cost color water-based super high temperature resistant paint. Because of using the sintering crosslinking mode, the cost of the glass powder, the sericite, the bauxite powder and the like is extremely low, the consumption of high-cost organic silicon resin can be greatly reduced, and the paint cost is greatly reduced.
A self-crosslinking and sintering crosslinking prepared low-cost color water-based super high temperature resistant coating comprises the following components in parts by weight:
Figure BDA0003120731210000021
Figure BDA0003120731210000031
the coating is sintered and molded on the surface of the base material at the high temperature of 500-850 ℃.
The paint is composed of organic silicon heat-resistant resin, high-temperature-resistant pigment, self-crosslinking acrylic acid solution, filler, amino resin, sintering material and auxiliary agent, wherein the product is cured into a film by adopting a self-crosslinking and sintering crosslinking mode, the film is coated with ceramic after being formed, dispersed single-particle resin and powder are fused, diffused and sintered into a compact whole by sintering, the paint can resist the high temperature of 500-850 ℃ after being cured for a long time, the product has excellent heat resistance, good base material adhesion, high hardness, excellent wear resistance and good corrosion and weather resistance, the paint cost can be greatly reduced by adopting sintering crosslinking, the requirement on the resin performance is reduced, the low-cost super high-temperature-resistant paint can be prepared, and the paint can be widely applied to the fields of vehicle exhaust pipes such as automobiles, motorcycles, tractors and the like, thermal power chimneys, heating electric appliances, aerospace industry and the like.
Preferably, the silicone heat-resistant resin includes benzyl silicone resin and methyl silicone resin. The preferred benzyl silicone Resin is a product of Rhodia corporation with model number Resin 10312, which has outstanding high thermal stability. The methyl silicone resin is a solid silicone resin with the model number of KR-220L or KR-220LP of Xinyue company, and organic substituent groups completely consisting of methyl, and has very excellent thermal stability. The ratio of the benzyl silicone resin to the methyl silicone resin is preferably 1:1-2, and the coating can be rapidly crosslinked by heating, has very high hardness, and has moisture resistance, insulating property, water resistance and mold release property.
Preferably, the high-temperature resistant pigment comprises aluminum silver paste, cobalt blue powder and iron oxide red. The aluminum paste has the characteristics of high temperature resistance and thermal stability, the cobalt blue powder is good in heat resistance, insulation, abrasion resistance and chemical property stability, the iron oxide red is a physical antirust pigment, the compactness of a coating film can be improved, the permeability is reduced, the coating is spread on the surface of a base material after being sintered into a film through compounding of various heat-resistant pigments, the coating is arranged in multiple layers, overlapped and covered mutually, a labyrinth effect is generated, the path for external liquid and gas to enter the coating film is increased, and the high temperature resistance effect and the corrosion resistance of the coating film are improved. The pigment should also have reasonable particle size distribution, coarse coating layer with too coarse particle size, poor suspension and permeability, and poor coating crack resistance if too fine. The particle size distribution should be in a proper particle size range with a large dispersion degree, so as to fully utilize the mutual embedding effect of the coarse and fine particles to obtain a compact coating, improve the metal liquid penetration resistance of the coating, and preferably about 300-350 meshes.
Preferably, the self-crosslinking acrylic emulsion is TAR-3350-50 or YB-39F-50, has a solid content of 50 +/-2 percent and a viscosity of Y-Z2, is acrylic polyurethane resin for quick-drying baking paint, has good low-temperature bridging property (can be bridged at the temperature of more than 80 ℃), good adhesion to metal and inorganic materials, good interlayer adhesion, excellent adhesion between a paint film and ink transfer after baking, good pigment wetting dispersibility, good luster and chemical resistance, excellent compatibility with organic silicon resin and good pigment wetting dispersibility.
Preferably, the filler includes alunite powder, feldspar powder, rutile type titanium dioxide powder and zirconium dioxide powder. The content of Al2O3 in the bauxite powder is more than or equal to 85 percent, the bauxite powder is used as the refractory aggregate of the coating, has the characteristics of small expansion coefficient, high refractoriness and good chemical stability, the rutile type titanium dioxide has good weather resistance, sintering can be promoted by adding a small amount of rutile type titanium dioxide and Cr2O3, and the rutile type titanium dioxide and the Cr2O3 are all superfine fillers, so that the using amount of pigment can be reduced.
Preferably, the amino resin is hexamethoxymethylmelamine resin (HMMM). The hexamethoxy methyl melamine resin can be in cross-linking reaction with self-crosslinking acrylic emulsion, a flat and smooth paint film is firstly formed by heating reaction of the self-crosslinking aqueous emulsion and amino resin under the condition of low temperature, and then glass powder, sericite and alunite powder are gradually ceramized under the control of a cooling stabilizer and a sintering material under the condition of gradual heating to form the double-crosslinking high-temperature-resistant paint. The preferred type is CYMEL303, viscosity is 2600-5000, a very effective crosslinking agent. Particularly when the modified polyurethane is crosslinked with organic silicon resin, good flexibility and formability can be provided for paint films, the modified polyurethane can be quickly catalyzed and cured, the hardness is improved, and good flexibility can be obtained
Preferably, the cooling stabilizer is baking varnish stabilizer AD-2K, baking varnish cooling agent LE-6080 and/or viscosity stabilizer K-38. The temperature reduction stabilizer is added, so that the storage stability problem of the baking varnish can be effectively solved, and the influence on the baking varnish stability caused by self-condensation crosslinking of the coating is avoided.
Preferably, the sintering material is glass powder, sericite and kaolin; the sintering agent promotes partial sintering and encrustation of the refractory filler particles.
Preferably, the wetting dispersant is BYK190 and/or BYK 192.
The adhesion promoter is PN-701, is a high-performance adhesion promoter, and the active group part of the product molecule has strong adhesion to the substrate, can improve the dispersibility and form strong bonding between the inorganic substrate and the organic polymer during sintering, thereby enhancing the chemical tight adhesion of the substrate, and increasing the waterproofness, the wear resistance, the scrub resistance and the scratch resistance.
The organic silicon assistant is used in the water-based paint, so that the leveling property, the smoothness, the gloss, the anti-sticking property, the water resistance, the chemical resistance, the high temperature resistance and the printing resistance of a coating film can be obviously improved.
A preparation method for preparing low-cost color water-based super high temperature resistant paint by self-crosslinking and sintering crosslinking comprises the following steps:
(1) adding organic silicon heat-resistant resin, high-temperature-resistant pigment, self-crosslinking acrylic emulsion, filler and sintering material into a ball milling tank, ball milling for 1-2 hours, and controlling the rotating speed to be 200-220 r/min;
(2) adding amino resin, stirring for 1-1.5 hours at 800-;
(3) adding adhesion promoter, wetting dispersant and cooling stabilizer, stirring at the rotation speed of 400-600 rpm for 40-60 minutes, uniformly mixing, and finally filtering to obtain the paint.
A use method for preparing low-cost color water-based super high temperature resistant coating by self-crosslinking and sintering crosslinking comprises the following steps:
s1, pretreatment of the base material: carrying out pretreatment of degreasing, derusting and deburring on a base material;
s2, coating and pre-baking: coating the paint on the surface of a substrate, placing the substrate at the temperature of 80-150 ℃ for pre-drying for 8-15min to ensure that the water of the coating liquid is evaporated and the coating liquid is leveled uniformly, and controlling the coating amount of the coating film to be 1.0-3.0g/m2Within the range;
s3, sintering: and sintering the pre-baked base material at the high temperature of 500-850 ℃ for 20-30 min.
Compared with the prior art, the invention has the following advantages:
the application provides a self-crosslinking and sintering crosslinking preparation low-cost color water-based super high temperature resistant coating, a product is cured into a film by adopting a self-crosslinking and sintering crosslinking mode, the film is coated with ceramic after the film is formed, dispersed single-particle resin is fused, diffused and sintered into a compact whole by sintering, the coating can resist high temperature of 500-850 ℃ for a long time after being cured, the product has excellent heat resistance, good base material adhesion, high hardness, excellent wear resistance and good corrosion and weather resistance, the coating cost can be greatly reduced by adopting the sintering crosslinking, the requirement on the resin performance is reduced, the low-cost super high temperature resistant coating can be prepared, and the low-cost super high temperature resistant coating can be widely applied to the fields of vehicle exhaust pipes such as automobiles, motorcycles, tractors and the like, chimneys of thermal power plants, heating electrical appliances, aerospace industry and the like.
The preparation method for preparing the low-cost colored water-based super high-temperature-resistant coating through self-crosslinking and sintering crosslinking has the advantages of simple processing and very low cost, the product is cured into a film through self-crosslinking and sintering crosslinking, the film is ceramic after the film is formed, the paint cost can be greatly reduced through sintering crosslinking, the requirement on the resin performance is lowered, and the low-cost super high-temperature-resistant coating can be prepared.
The application provides a use method of preparing low-cost color water-based super high temperature resistant coating through self crosslinking and sintering crosslinking, which comprises the steps of adopting self crosslinking and sintering crosslinking, coating a film after film forming and ceramizing, preheating to 80-150 ℃, keeping the temperature for a period of time, and then heating to 500-850 ℃ for sintering, so that dispersed single-particle resin is fused, diffused and sintered into a compact whole.
Detailed Description
The following describes a specific embodiment of the present invention with reference to specific examples 1 to 4 and comparative examples:
example 1:
a preparation method for preparing low-cost color water-based super high temperature resistant paint by self-crosslinking and sintering crosslinking comprises the following steps:
(1) weighing the components according to the weight parts in the table 1, adding the organic silicon heat-resistant resin, the high-temperature resistant pigment, the self-crosslinking acrylic emulsion, the filler and the sintering material into a ball milling tank, and carrying out ball milling for 1.5 hours at the rotating speed of 210 r/min;
(2) adding amino resin, stirring and mixing for 1.5 hours at 800 r/min;
(3) adding adhesion promoter, wetting dispersant and cooling stabilizer, stirring at 600 rpm for 40 min, mixing, and filtering.
A use method for preparing low-cost color water-based super high temperature resistant coating by self-crosslinking and sintering crosslinking comprises the following steps:
s1, pretreatment of the base material: carrying out pretreatment of degreasing, derusting and deburring on a base material;
s2, coating and pretreatingBaking: coating the paint on the surface of a substrate, placing the substrate at 100 ℃ for pre-drying for 10min to evaporate the water of the coating liquid, leveling uniformly, and controlling the coating amount of the coating film to be 1.5g/m2Within the range;
s3, sintering: and sintering the pre-baked base material at a high temperature of more than 500 ℃ for 20 min.
Example 2:
a preparation method for preparing low-cost color water-based super high temperature resistant paint by self-crosslinking and sintering crosslinking comprises the following steps:
(1) weighing the components according to the weight parts in the table 1, adding the organic silicon heat-resistant resin, the high-temperature resistant pigment, the self-crosslinking acrylic emulsion, the filler and the sintering material into a ball milling tank, and carrying out ball milling for 2 hours at the rotating speed of 210 r/min;
(2) adding amino resin, stirring and mixing for 1.5 hours at 900 rpm;
(3) adding adhesion promoter, wetting dispersant and cooling stabilizer, stirring at 400 rpm for 60 min, mixing, and filtering.
A use method for preparing low-cost color water-based super high temperature resistant coating by self-crosslinking and sintering crosslinking comprises the following steps:
s1, pretreatment of the base material: carrying out pretreatment of degreasing, derusting and deburring on a base material;
s2, coating and pre-baking: coating the paint on the surface of a substrate, placing the substrate at 130 ℃ for pre-baking for 12min to evaporate the water of the coating liquid, leveling uniformly, and controlling the coating amount of the coating film to be 1.0g/m2Within the range;
s3, sintering: and sintering the pre-baked base material at the high temperature of 700 ℃ for 30 min.
Example 3:
a preparation method for preparing low-cost color water-based super high temperature resistant paint by self-crosslinking and sintering crosslinking comprises the following steps:
(1) weighing the components according to the weight parts in the table 1, adding the organic silicon heat-resistant resin, the high-temperature resistant pigment, the self-crosslinking acrylic emulsion, the filler and the sintering material into a ball milling tank, and carrying out ball milling for 1 hour at the rotating speed of 200 r/min;
(2) adding amino resin, stirring and mixing for 1 hour at 1000 rpm;
(3) adding adhesion promoter, wetting dispersant and cooling stabilizer, stirring at 500 rpm for 50 min, mixing, and filtering.
A use method for preparing low-cost color water-based super high temperature resistant coating by self-crosslinking and sintering crosslinking comprises the following steps:
s1, pretreatment of the base material: carrying out pretreatment of degreasing, derusting and deburring on a base material;
s2, coating and pre-baking: coating the paint on the surface of a substrate, placing the substrate at 80 ℃ for pre-baking for 15min to evaporate the water of the coating liquid, leveling uniformly, and controlling the coating amount of the coating film to be 2.0g/m2Within the range;
s3, sintering: and sintering the pre-baked base material at the high temperature of 850 ℃ for 25 min.
Example 4:
a preparation method for preparing low-cost color water-based super high temperature resistant paint by self-crosslinking and sintering crosslinking comprises the following steps:
(1) weighing the components according to the weight parts in the table 1, adding the organic silicon heat-resistant resin, the high-temperature resistant pigment, the self-crosslinking acrylic emulsion, the filler and the sintering material into a ball milling tank, and carrying out ball milling for 2 hours at the rotating speed of 220 r/min;
(2) adding amino resin, stirring and mixing for 1 hour at 900 rpm;
(3) adding adhesion promoter, wetting dispersant and cooling stabilizer, stirring at 500 rpm for 45 min, mixing, and filtering.
A use method for preparing low-cost color water-based super high temperature resistant coating by self-crosslinking and sintering crosslinking comprises the following steps:
s1, pretreatment of the base material: carrying out pretreatment of degreasing, derusting and deburring on a base material;
s2, coating and pre-baking: coating the paint on the surface of a substrate, placing the substrate at 150 ℃ for pre-drying for 8min to evaporate the water of the coating liquid, leveling uniformly, and controlling the coating amount of the coating film to be 3.0g/m2Within the range;
s3, sintering: and sintering the pre-baked base material at the high temperature of 650 ℃ for 30 min.
Table 1: in the examples 1 to 4, the weight percentage of each component is as follows:
Figure BDA0003120731210000101
the low-cost colored aqueous ultra-high temperature resistant coating prepared by coating the self-crosslinking and sintering crosslinking in the examples 1 to 4 and a comparative example (commercially available self-crosslinking non-sintering high temperature resistant coating) are subjected to performance comparison tests, and the test items and the test results are shown in table 2:
table 2: and (3) performance test results:
Figure BDA0003120731210000111
the test results in the experimental table 2 show that compared with the commercially available self-crosslinking high-temperature-resistant coating, the coating has high temperature resistance up to 850 ℃, the product prepared by the coating has excellent heat resistance, good base material adhesion, high hardness, excellent wear resistance, good corrosion resistance and weather resistance, can be used for preparing low-cost ultrahigh-temperature-resistant coating, and can be widely applied to the fields of vehicle exhaust pipes such as automobiles, motorcycles, tractors and the like, chimneys of thermal power plants, heating appliances, aerospace military industry and the like.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The self-crosslinking and sintering crosslinking prepared low-cost water-based super high temperature resistant paint is characterized by comprising the following components in parts by weight:
Figure FDA0003120731200000011
the coating is sintered and molded on the surface of the base material at the high temperature of 500-850 ℃.
2. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the silicone heat-resistant resin comprises benzyl silicone resin and methyl silicone resin.
3. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the high-temperature resistant pigment comprises aluminum silver paste, cobalt blue powder and iron oxide red.
4. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the self-crosslinking acrylic acid solution has a solid content of 50 +/-2% and a viscosity of Y-Z2。
5. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the filler comprises bauxite powder, rutile type titanium dioxide, zirconium dioxide powder and feldspar powder.
6. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the amino resin is hexamethoxy methyl melamine resin.
7. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the cooling stabilizer is baking varnish stabilizer AD-2K, LE-6080 and/or viscosity stabilizer K-38.
8. The self-crosslinking and sintering-crosslinking low-cost aqueous ultra-high temperature resistant coating prepared according to claim 1, which is characterized in that: the sintering aid is glass powder, sericite and/or kaolin;
the wetting dispersant is BYK190 and/or BYK 192.
9. The method for preparing the low-cost water-based ultrahigh temperature resistant coating by self-crosslinking and sintering crosslinking as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
(1) adding organic silicon heat-resistant resin, high-temperature-resistant pigment, self-crosslinking acrylic acid solution, filler and sintering material into a ball milling tank, ball milling for 1-2 hours, and controlling the rotating speed to be 200-220 r/min;
(2) adding amino resin, stirring for 1-1.5 hours at 800-;
(3) adding adhesion promoter, wetting dispersant and cooling stabilizer, stirring at the rotation speed of 400-600 rpm for 40-60 minutes, uniformly mixing, and finally filtering to obtain the paint.
10. The use of the self-crosslinking and sinter-crosslinking process for preparing low-cost aqueous, ultra-high temperature resistant coatings according to any of claims 1 to 8, comprising the steps of:
s1, pretreatment of the base material: carrying out pretreatment of degreasing, derusting and deburring on a base material;
s2, coating and pre-baking: coating the paint on the surface of a substrate, placing the substrate at the temperature of 80-150 ℃ for pre-drying for 8-15min to ensure that the water of the coating liquid is evaporated and the coating liquid is leveled uniformly, and controlling the coating amount of the coating film to be 1.0-3.0g/m2Within the range;
s3, sintering: and sintering the pre-baked base material at the high temperature of 500-850 ℃ for 20-30 min.
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