Bottom matching heat-resistant coating system as well as preparation method and application thereof

Abstract

The invention discloses a bottom matching heat-resistant coating system and a preparation method and application thereof.The coating system is formed by matching primer and finish paint and then conducting high-temperature sintering, and the primer is prepared from methyl phenyl silicone resin, glass powder, A-type high-thermal-conductivity aluminum oxide, yttrium modified nano zirconium oxide, high-temperature pigment, methylbenzene, a dispersing agent, a defoaming agent and a wetting leveling agent; the finishing paint comprises the following components: B-type high-thermal-conductivity aluminum oxide, yttrium modified nano zirconium oxide, a low-boiling-point solvent, a medium-boiling-point solvent, a silane coupling agent, a defoaming agent and a wetting leveling agent. The bottom surface matched heat-resistant coating system with the micro-nano-scale rough structure design has the characteristics of high adhesive force, excellent temperature impact resistance, outstanding adhesion resistance at high temperature and the like, and has a wide market application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a bottom surface matching heat-resistant coating system and a preparation method and application thereof. Background Art

[0002] Heat-resistant coatings are specialized functional coatings designed to protect substrates from damage in high-temperature environments while maintaining their performance and functionality. They effectively prevent high-temperature erosion of materials, preventing performance degradation, deformation, and melting. They are widely used in industrial equipment, aerospace, automotive engine components, power equipment, and other fields. Patent CN201210289963.9 discloses a two-component composite heat-resistant coating for automotive exhaust pipes, using inorganic silicates and silicone resins as film-forming materials and curing at 280°C. CN201210563457.4 discloses a phenolic epoxy-modified silicone resin and a long-lasting, corrosion-resistant, and heat-resistant coating prepared therefrom. Patent CN202111138112.X discloses an organic-inorganic composite heat-resistant coating that is resistant to sudden cooling and cracking for high-temperature equipment in the petrochemical and metallurgical industries. The above-mentioned heat-resistant coatings are all single-coating designs, and the coating surface has no structural design. At higher temperatures, the coating surface will undergo structural rearrangement, causing the originally relatively regular surface to become disordered. At high temperatures, the surface has weak anti-adhesion properties and is easily corroded, resulting in a decrease in the overall performance of the coating. Summary of the Invention

[0003] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a bottom surface matching heat-resistant coating system and its preparation method and application.

[0004] The present invention is achieved through the following technical solutions:

[0005] A heat-resistant coating system for bottom and surface matching, wherein the coating system is formed by matching a primer and a topcoat and then sintering at high temperature;

[0006] The components included in the primer and the mass fractions of each component are:

[0007]

[0008]

[0009] The components included in the topcoat and the mass fractions of each component are:

[0010]

[0011] In the above technical solution, the methylphenyl silicone resin is any one or more of SH-9604, SH-9605, CFS18050 or FJN-9802.

[0012] In the above technical solution, the melting temperature range of the glass powder is 350℃~1000℃; preferably, the glass powder is composed of glass powders of two different melting temperature ranges, and the melting temperatures are one or more of 450℃~700℃ and one or more of 800℃~900℃ respectively.

[0013] In the above technical solution, the A-type high thermal conductivity alumina has a spherical morphology and a particle size of 3μm to 10μm; the B-type high thermal conductivity alumina has a spherical morphology and a particle size of 30μm to 200μm, preferably a particle size of 50μm to 100μm.

[0014] In the above technical solution, the particle size of the yttrium-modified nano-zirconia is 30nm-100nm, the yttrium oxide content in the yttrium-modified nano-zirconia is 5.3wt%-13.2wt%, and preferably, the yttrium oxide content in the yttrium-modified nano-zirconia is 8.0wt%-13.2wt%.

[0015] In the above technical solution, the low boiling point solvent is any one or more of methanol, ethanol, isopropanol or ethyl acetate;

[0016] The medium boiling point solvent is any one or more of propylene glycol methyl ether, ethylene glycol ethyl ether or butyl acetate.

[0017] In the above technical solution, the high-temperature pigment is any one or more of copper chrome black, cobalt blue, cobalt green or titanium nickel yellow.

[0018] In the above technical solution, the particle size of the high-temperature pigment is 1 μm to 5 μm.

[0019] In the above technical solution, the dispersant is any one or more of Tech-541, Tech-513 or Tech-5320.

[0020] In the above technical solution, the defoaming agent is any one or more of AFCONA 2020, AFCONA 2035 or AFCONA 2050.

[0021] In the above technical solution, the wetting and leveling agent is any one or more of AFCONA 3034, BYK-331 or BYK-333.

[0022] In the above technical solution, the silane coupling agent is any one or more of γ-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxysilane, 3-ureapropyltriethoxysilane or N-(2-aminoethyl)-3-aminopropyltriethoxysilane.

[0023] A method for preparing a bottom surface supporting heat-resistant coating system comprises the following steps:

[0024] (I) Preparation of primer

[0025] Add the measured methylphenyl silicone resin, toluene, dispersant, defoamer and wetting and leveling agent into a suitable container and stir at a speed of 1500 rad / min to 2000 rad / min for 15 to 25 minutes using a high-speed disperser; then add glass powder, type A high thermal conductivity alumina, yttrium-modified nano zirconium oxide and high-temperature pigment and continue stirring at a speed of 1500 rad / min to 2000 rad / min for 30 to 40 minutes; finally, grind with a sand mill until the fineness is ≤ 25 μm, filter the material and obtain the primer;

[0026] (II) Preparation of topcoat

[0027] Add the measured low-boiling point solvent, medium-boiling point solvent, defoamer and wetting and leveling agent into a suitable container, and stir them at a speed of 1500rad / min to 2000rad / min for 5min to 10min using a high-speed disperser; then add the measured silane coupling agent, B-type high thermal conductivity alumina and yttrium-modified nano-zirconia, and continue stirring at a speed of 1500rad / min to 2000rad / min for 30min to 40min; finally, grind them with a sand mill until the fineness reaches the primary particle size of B-type high thermal conductivity alumina, and filter the discharged material to obtain the topcoat;

[0028] (III) High temperature sintering

[0029] (III-i) Degrease the prefabricated, cut, and carved stainless steel mold plate with xylene and then perform blasting treatment. The surface cleanliness of the steel plate should be above Sa2.5 level specified in GB / T 8923;

[0030] (III-ii) A wet-on-wet coating process is used to spray the primer and topcoat. The primer is first sprayed onto the stainless steel mold plate using compressed air at an air pressure of 0.4 MPa to 0.6 MPa, and the dry film thickness of the primer is 45 μm to 80 μm. The sample sprayed with the primer is left to dry in the air for 10 to 20 minutes. Then, a thin layer of topcoat is sprayed on the primer using compressed air at an air pressure of 0.4 MPa to 0.6 MPa. After the coating is completed, the sample is left to dry in the air for 15 to 20 minutes.

[0031] (III-III) Place the coated stainless steel mold plate in a high-temperature furnace, turn on the heating, and heat it to 750°C~770°C at a heating rate of 5°C / min~10°C / min, keep it warm for 1h~2h, turn off the high-temperature furnace, and cool it naturally.

[0032] An application of a bottom surface supporting heat-resistant coating system in glass thermal transfer frosting processing and molding includes the following steps:

[0033] (i) placing a stainless steel mold plate coated with a bottom surface heat-resistant coating system in a programmable temperature-controlled heating furnace, and placing a glass flat on the side of the stainless steel mold plate coated with the coating system;

[0034] (ii) starting a heating program to heat the heating furnace to 500° C. to 550° C. at a heating rate of 10° C. / min to 20° C. / min;

[0035] (iii) further heating the furnace to 720°C to 750°C at a heating rate of 5°C / min to 10°C / min and maintaining the temperature for 20 to 40 minutes;

[0036] (iv) starting a cooling program, cooling the heating furnace to 590° C. to 570° C. at a cooling rate of 5° C. / min to 10° C. / min, and further maintaining the temperature for 20 min to 30 min;

[0037] (v) cooling the heating furnace to 200° C. to 230° C. at a cooling rate of 3° C. / min to 5° C. / min, and then maintaining the temperature for 20 to 30 minutes;

[0038] (vi) The temperature is further naturally lowered to 50°C to 60°C in the furnace to obtain thermal transfer frosted glass.

[0039] The beneficial effects of the present invention are:

[0040] The present invention provides a bottom surface heat-resistant coating system and its preparation method and application. The bottom surface heat-resistant coating system is formed by high-temperature sintering of a primer and a topcoat. The spraying treatment of the stainless steel metal substrate improves the adhesion of the primer to the substrate under a high pigment-to-base ratio, thereby avoiding peeling of the coating from the substrate before high-temperature sintering. The primer and topcoat are applied using a wet-on-wet process. After the primer is sprayed, it is first dried in the air for 10 to 20 minutes, and then a resin-free topcoat is sprayed. The topcoat is mainly composed of a low-boiling point solvent, which promotes the uniform distribution of the powder in the topcoat on the primer and quickly sets the shape. Glass powder, high thermal conductivity alumina, yttrium-modified nano-aluminum oxide are used. The synergistic effect of zirconium and high-temperature resistant pigments enables the coating to be transformed from an organic system into an inorganic ceramic layer after high-temperature sintering on a stainless steel substrate. The combination of two glass powders with different melting temperature ranges effectively improves the bonding ability and thermal shock resistance of the inorganic ceramic coating. The high-melting temperature glass powder can further prevent the heat-resistant coating system from adhering to the glass during the glass thermal transfer process. The powder particles evenly distributed on the coating surface construct a rough surface structure at the micro-nano scale, which not only improves the frosting effect of the glass thermal transfer, but also improves the demolding effect of the frosted glass and reduces the probability of the glass adhering to the substrate after melting. The bottom surface heat-resistant coating system of the present invention can be used for glass thermal transfer frosting processing and molding. Through programmed temperature rise and fall, the process of batch processing and manufacturing frosted glass is stabilized, solving the problem of glass bursting caused by rapid temperature changes and reducing the defective rate. After the glass is thermally transferred and frosted, the area where the glass contacts the coating on the stainless steel appears frosted, while the hollowed-out area on the stainless steel remains transparent. Through pre-engraving of the stainless steel plate, the frosted glass is given a rich decorative effect, improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a diagram showing the application effect of thermal transfer on frosted glass in Example 1 of the present invention.

[0042] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] Example 1

[0045] A heat-resistant coating system for bottom and surface matching, wherein the coating system is formed by matching a primer and a topcoat and then sintering at high temperature;

[0046] The components included in the primer and the mass fractions of each component are:

[0047]

[0048] The components included in the topcoat and the mass fractions of each component are:

[0049]

[0050] A method for preparing a heat-resistant coating system for the bottom surface of frosted glass comprises the following steps:

[0051] (I) Preparation of primer

[0052] Add 50 parts of methylphenyl silicone resin SH-9604, 20 parts of toluene, 1 part of dispersant Tech-541, 0.5 parts of defoamer AFCONA 2020 and 0.3 parts of wetting and leveling agent AFCONA 3034 to a suitable container, stir at a speed of 1500 rad / min for 15 minutes using a high-speed disperser, then add 30 parts of glass powder with a melting temperature of 450°C, 20 parts of glass powder with a melting temperature of 800°C, 10 parts of 3μm particle size high thermal conductivity alumina and 5 parts of yttrium-modified nano-zirconia, continue stirring at a speed of 1500 rad / min for 30 minutes, and finally grind with a sand mill to a fineness of ≤25μm. After filtering the material, the primer is obtained;

[0053] (II) Preparation of topcoat

[0054] 10 parts of methanol, 10 parts of ethanol, 5 parts of propylene glycol methyl ether, 0.5 parts of defoamer AFCONA 2035 and 0.3 parts of wetting and leveling agent BYK-331 are added to a suitable container and stirred at a speed of 1500 rad / min for 5 minutes using a high-speed disperser. Then, 1 part of silane coupling agent γ-aminopropyltriethoxysilane, 100 parts of 30 μm particle size high thermal conductivity alumina and 10 parts of yttrium-modified nano-zirconium oxide are added and stirred at a speed of 1500 rad / min for 30 minutes. Finally, a sand mill is used for grinding until the fineness is ≤35 μm. After filtering the material, the topcoat is obtained.

[0055] (III) High temperature sintering

[0056] (III-i) After degreasing the pre-cut and engraved stainless steel plate with xylene, perform blasting treatment. The surface cleanliness of the steel plate should be above Sa2.5 level specified in GB / T 8923;

[0057] (III-ii) A wet-on-wet coating process is used to spray the primer and topcoat. The primer is first sprayed onto the stainless steel plate using compressed air at an air pressure of 0.4 MPa to 0.6 MPa, with a primer dry film thickness of 45 μm to 50 μm. The sample sprayed with the primer is left to dry in the air for 10 minutes. Then, a thin layer of topcoat is sprayed on the primer using compressed air at an air pressure of 0.4 MPa to 0.6 MPa. After the coating is completed, the stainless steel plate is left to dry in the air for 15 minutes.

[0058] (III-III) Place the coated stainless steel plate in a high-temperature furnace, turn on the heating, and heat it to 750℃~760℃ at a heating rate of 5℃ / min. Keep it warm for 1 hour, turn off the high-temperature furnace, and cool it naturally to obtain a mold with a bottom surface coated with a matching heat-resistant coating system.

[0059] An application of a bottom surface supporting heat-resistant coating system in glass thermal transfer frosting processing and molding includes the following steps:

[0060] (i) placing a mold having a bottom surface coated with a heat-resistant coating system in a programmable temperature-controlled heating furnace, and laying a glass flat on the mold;

[0061] (ii) starting the heating program to heat the heating furnace to 500° C. at a heating rate of 10° C. / min;

[0062] (iii) further heating the furnace to 720°C at a heating rate of 5°C / min and maintaining the temperature for 40 min;

[0063] (iv) starting the cooling program, cooling the heating furnace to 590°C at a cooling rate of 5°C / min, and further maintaining the temperature for 20 min;

[0064] (v) cooling the heating furnace to 200°C at a rate of 3°C / min and maintaining the temperature for 30 min;

[0065] (vi) The temperature is further naturally lowered to 50°C to 60°C along with the furnace.

[0066] Example 2

[0067] A heat-resistant coating system for bottom and surface matching, wherein the coating system is formed by matching a primer and a topcoat and then sintering at high temperature;

[0068] The components included in the primer and the mass fractions of each component are:

[0069]

[0070] The components included in the topcoat and the mass fractions of each component are:

[0071]

[0072]

[0073] A method for preparing a heat-resistant coating system for the bottom surface of frosted glass comprises the following steps:

[0074] (I) Preparation of primer

[0075] 50 parts of methylphenyl silicone resin SH-9605, 50 parts of methylphenyl silicone resin CFS18050, 50 parts of toluene, 1 part of dispersant Tech-513, 1 part of dispersant Tech-5320, 1 part of defoamer AFCONA 2035 and 0.8 part of wetting and leveling agent BYK-331 are added to a suitable container, and stirred at a speed of 2000 rad / min for 25 minutes using a high-speed disperser. Then, 50 parts of glass powder with a melting temperature of 700°C, 50 parts of glass powder with a melting temperature of 900°C, 30 parts of 10μm particle size high thermal conductivity alumina, 30 parts of yttrium-modified nano zirconium oxide, 15 parts of copper chrome black and 15 parts of cobalt blue are added, and stirring is continued at a speed of 2000 rad / min for 40 minutes. Finally, the mixture is ground with a sand mill until the fineness is ≤25μm. After filtering the material, the primer is obtained.

[0076] (II) Preparation of topcoat

[0077] 20 parts of isopropyl alcohol, 30 parts of ethyl acetate, 5 parts of ethylene glycol ethyl ether, 5 parts of butyl acetate, 1 part of defoamer AFCONA2035 and 0.8 parts of wetting and leveling agent BYK-331 are added to a suitable container, stirred at a speed of 2000 rad / min for 10 minutes using a high-speed disperser, and then 3 parts of silane coupling agent γ-aminopropyltriethoxysilane, 200 parts of 100 μm particle size high thermal conductivity alumina and 50 parts of yttrium-modified nano-zirconium oxide are added, and stirring is continued at a speed of 2000 rad / min for 40 minutes. Finally, a sand mill is used for grinding until the fineness is ≤110 μm. After filtering the material, the topcoat is obtained;

[0078] (III) High temperature sintering

[0079] (III-i) After degreasing the pre-cut and engraved stainless steel plate with xylene, perform blasting treatment. The surface cleanliness of the steel plate should be above Sa2.5 level specified in GB / T 8923;

[0080] (III-ii) A wet-on-wet coating process is used to spray the primer and topcoat. The primer is first sprayed onto the substrate using compressed air at an air pressure of 0.4 MPa to 0.6 MPa, with a primer dry film thickness of 75 μm to 80 μm. The sample sprayed with the primer is left to dry in the air for 10 minutes. Then, a thin layer of topcoat is sprayed on the primer using compressed air at an air pressure of 0.5 MPa. After the coating is completed, the sample is left to dry in the air for 20 minutes.

[0081] (III-III) Place the coated stainless steel plate in a high-temperature furnace, turn on the heating, and heat it to 760℃~770℃ at a heating rate of 10℃ / min. Keep it warm for 1 hour, turn off the high-temperature furnace, and cool it naturally to obtain a mold with a bottom surface coated with a matching heat-resistant coating system.

[0082] An application of a bottom surface supporting heat-resistant coating system in glass thermal transfer frosting processing and molding includes the following steps:

[0083] (i) placing a mold having a bottom surface coated with a heat-resistant coating system in a programmable temperature-controlled heating furnace, and laying a glass flat on the mold;

[0084] (ii) starting the heating program to heat the heating furnace to 550° C. at a heating rate of 20° C. / min;

[0085] (iii) further heating the furnace to 750°C at a heating rate of 10°C / min and maintaining the temperature for 20 min;

[0086] (iv) starting the cooling program, cooling the heating furnace to 570°C at a cooling rate of 10°C / min, and further maintaining the temperature for 30 min;

[0087] (v) cooling the heating furnace to 230°C at a rate of 5°C / min and maintaining the temperature for 20 min;

[0088] (vi) The temperature is further naturally lowered to 50°C to 60°C in the furnace to obtain a finished frosted glass product.

[0089] Example 3

[0090] A heat-resistant coating system for bottom and surface matching, wherein the coating system is formed by matching a primer and a topcoat and then sintering at high temperature;

[0091] The components included in the primer and the mass fractions of each component are:

[0092]

[0093]

[0094] The components included in the topcoat and the mass fractions of each component are:

[0095]

[0096] A method for preparing a heat-resistant coating system for the bottom surface of frosted glass comprises the following steps:

[0097] (I) Preparation of primer

[0098] Add 80 parts of methylphenyl silicone resin FJN-9802, 40 parts of toluene, 1.5 parts of dispersant Tech-541, 0.8 parts of defoamer AFCONA 2050 and 0.5 parts of wetting and leveling additive BYK-333 to a suitable container and stir at a speed of 1800 rad / min for 20 minutes using a high-speed disperser. Then add 30 parts of glass powder with a melting temperature of 550°C, 40 parts of glass powder with a melting temperature of 850°C, 20 parts of 8μm particle size high thermal conductivity alumina, 25 parts of yttrium-modified nano-zirconia, 10 parts of cobalt green and 10 parts of titanium nickel yellow. Continue stirring at a speed of 1800 rad / min for 35 minutes. Finally, grind with a sand mill until the fineness is ≤25μm. After filtering the material, the primer is obtained.

[0099] (II) Preparation of topcoat

[0100] 15 parts of ethanol, 25 parts of ethyl acetate, 5 parts of ethylene glycol ethyl ether, 5 parts of butyl acetate, 0.8 parts of defoamer AFCONA2035 and 0.3 parts of wetting and leveling additive BYK-333 are added to a suitable container, stirred at a speed of 1600 rad / min for 8 minutes using a high-speed disperser, and then 1 part of silane coupling agent N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 0.5 parts of silane coupling agent 3-ureapropyltriethoxysilane, 0.5 parts of silane coupling agent γ-aminopropyltriethoxysilane, 150 parts of 60μm particle size high thermal conductivity alumina and 40 parts of yttrium-modified nano zirconium oxide are added, and stirring is continued at a speed of 1800 rad / min for 35 minutes. Finally, a sand mill is used for grinding to a fineness of ≤70μm. After filtering the material, the topcoat is obtained;

[0101] (III) High temperature sintering

[0102] (III-i) After degreasing the pre-cut and engraved stainless steel plate with xylene, perform blasting treatment. The surface cleanliness of the steel plate should be above Sa2.5 level specified in GB / T 8923;

[0103] (III-ii) A wet-on-wet coating process is used to spray the primer and topcoat. The primer is first sprayed onto the stainless steel plate using compressed air at an air pressure of 0.4 MPa to 0.6 MPa, with a primer dry film thickness of 65 μm to 70 μm. The sample sprayed with the primer is left to dry in the air for 15 minutes. Then, a thin layer of topcoat is sprayed on the primer using compressed air at an air pressure of 0.4 MPa. After the coating is completed, the sample is left to dry in the air for 20 minutes.

[0104] (III-III) Place the coated stainless steel plate in a high-temperature furnace, turn on the heating, and heat it to 755℃~765℃ at a heating rate of 8℃ / min. Keep it warm for 1.5 hours. Turn off the high-temperature furnace and cool it naturally to obtain a mold with a bottom surface coated with a matching heat-resistant coating system.

[0105] An application of a bottom surface supporting heat-resistant coating system in glass thermal transfer frosting processing and molding includes the following steps:

[0106] (i) placing a mold having a bottom surface coated with a heat-resistant coating system in a programmable temperature-controlled heating furnace, and laying a glass flat on the mold;

[0107] (ii) starting the heating program to heat the heating furnace to 530°C at a heating rate of 15°C / min;

[0108] (iii) further heating the furnace to 730°C at a heating rate of 8°C / min and maintaining the temperature for 30 min;

[0109] (iv) starting the cooling program, cooling the heating furnace to 580°C at a cooling rate of 8°C / min, and further maintaining the temperature for 25 min;

[0110] (v) cooling the heating furnace to 220°C at a rate of 4°C / min and maintaining the temperature for 30 min;

[0111] (vi) The temperature is further naturally lowered to 50°C to 60°C in the furnace to obtain a finished frosted glass product.

[0112] Comparative Example 1

[0113] The bottom surface matching heat-resistant coating system of this comparative example is formed only by sintering the primer in Example 1. The coating preparation process, sintering molding method and thermal transfer frosting processing molding process of the glass are the same as those in Example 1.

[0114] Comparative Example 2

[0115] The bottom surface matching heat-resistant coating system of this comparative example is composed of a primer and a topcoat, and the primer and the topcoat are both selected from the primer and the topcoat prepared in Example 2. The glass thermal transfer frosting processing and molding method is the same as in Example 2.

[0116] The difference between this comparative example and Example 2 is that the samples coated with primer and topcoat did not undergo the high-temperature sintering process of "raising the temperature to 750℃~770℃ and keeping warm for 1 hour" before being used for glass thermal transfer frosting processing. Instead, they underwent the following process before being used for glass thermal transfer frosting processing: the mold coated with primer and topcoat was first dried in the air for 20 minutes, then placed in a high-temperature furnace and heated to 160℃~170℃ at 10℃ / min, kept warm for 30 minutes, and then cooled.

[0117] Comparative Example 3

[0118] The composition and preparation method of the bottom surface heat-resistant coating system of this comparative example are the same as those of Example 3, but the glass thermal transfer frosting processing and molding method is different from that of Example 3.

[0119] The glass thermal transfer frosting processing and molding of this comparative example includes the following steps:

[0120] (i) placing a mold having a bottom surface coated with a heat-resistant coating system in a programmable temperature-controlled heating furnace, and laying a glass flat on the mold;

[0121] (ii) starting the heating program to heat the heating furnace to 530°C at a heating rate of 25°C / min;

[0122] (iii) further heating the furnace to 800°C at a heating rate of 20°C / min and maintaining the temperature for 15 min;

[0123] (iv) starting the cooling program, cooling the heating furnace to 580°C at a cooling rate of 15°C / min, and further maintaining the temperature for 40 min;

[0124] (v) cooling the heating furnace to 220°C at a rate of 20°C / min and maintaining the temperature for 30 min;

[0125] (vi) The temperature is further naturally lowered to 50°C to 60°C in the furnace to obtain a finished frosted glass product.

[0126] The embodiments and comparative examples were tested, and the test results are shown in Table 1.

[0127] Table 1 Test results

[0128]

[0129]

[0130] From the test results in Table 1, it can be found that the bottom surface heat-resistant coating system of the present invention has the characteristics of excellent adhesion, outstanding temperature shock resistance and outstanding anti-adhesion ability at high temperature. It has been verified by its application in the frosted glass thermal transfer processing and molding that it can realize stable batch processing and manufacturing of frosted glass, and at the same time give frosted glass a rich decorative effect, improve the market competitiveness of the product, and solve the problems of poor glass demolding, shedding of transfer coating, glass cracking, etc., thereby improving the yield rate of frosted glass.

[0131] The applicant declares that the above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the scope of protection and disclosure of the present invention.

Claims

1. A bottom surface heat-resistant coating system, characterized by: The coating system is formed by matching primer and topcoat and then sintering at high temperature; The components included in the primer and the mass fractions of each component are: The components included in the topcoat and the mass fractions of each component are:

2. The bottom surface heat-resistant coating system according to claim 1, characterized in that: The methylphenyl silicone resin is any one or more of SH-9604, SH-9605, CFS18050 or FJN-9802.

3. The bottom surface heat-resistant coating system according to claim 1, characterized in that: The melting temperature of the glass powder ranges from 350°C to 1000°C.

4. The bottom surface heat-resistant coating system according to claim 1, characterized in that: The A-type high thermal conductivity alumina has a spherical morphology and a particle size of 3 μm to 10 μm; the B-type high thermal conductivity alumina has a spherical morphology and a particle size of 30 μm to 200 μm, preferably 50 μm to 100 μm.

5. The bottom surface heat-resistant coating system according to claim 1, characterized in that: The particle size of the yttrium-modified nano-zirconia is 30 nm to 100 nm, and the content of yttrium oxide in the yttrium-modified nano-zirconia is 5.3 wt % to 13.2 wt %.

6. The bottom surface heat-resistant coating system according to claim 1, characterized in that: The low boiling point solvent is any one or more of methanol, ethanol, isopropanol or ethyl acetate; the medium boiling point solvent is any one or more of propylene glycol methyl ether, ethylene glycol ethyl ether or butyl acetate.

7. The bottom surface heat-resistant coating system according to claim 1, characterized in that: The high temperature pigment is any one of copper chrome black, cobalt blue, cobalt green or titanium nickel yellow; the particle size of the high temperature pigment is 1 μm to 5 μm; The dispersant is any one or more of Tech-541, Tech-513 or Tech-5320; The defoaming agent is any one or more of AFCONA 2020, AFCONA 2035 or AFCONA 2050; The wetting and leveling agent is any one or more of AFCONA 3034, BYK-331 or BYK-333; The silane coupling agent is any one or more of γ-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxysilane, 3-ureapropyltriethoxysilane or N-(2-aminoethyl)-3-aminopropyltriethoxysilane.

8. A method for preparing the bottom surface supporting heat-resistant coating system according to any one of claims 1 to 7, characterized in that: The following steps are involved: (I) Preparation of primer Mix methylphenyl silicone resin, toluene, dispersant, defoamer and wetting and leveling agent evenly, then add glass powder, type A high thermal conductivity alumina, yttrium-modified nano zirconium oxide and high-temperature pigment, continue to mix evenly, and grind to a fineness of ≤25μm to obtain a primer; (II) Preparation of topcoat A low boiling point solvent, a medium boiling point solvent, a defoamer and a wetting and leveling agent are stirred and mixed evenly, and then a silane coupling agent, a type B high thermal conductivity alumina and a yttrium-modified nano-zirconia are added and stirred and mixed evenly, and the mixture is ground to a fineness equal to the primary particle size of the type B high thermal conductivity alumina to obtain a topcoat; (III) High temperature sintering (III-i) degreasing and spray-blasting the prefabricated, cut, and engraved stainless steel mold plate; (III-ii) spraying primer and topcoat using wet-on-wet painting process; (III-III) Heat the coated stainless steel mold plate and then allow it to cool naturally.

9. The method for preparing the bottom surface supporting heat-resistant coating system according to claim 8, characterized in that: The specific method of spraying primer and topcoat using the wet-on-wet coating process is as follows: first spraying the primer onto the stainless steel mold plate using compressed air, the air pressure is 0.4MPa-0.6MPa, and the dry film thickness of the primer is 45μm-80μm; the stainless steel mold plate sprayed with the primer is placed in the air to dry for 10min-20min, and then a thin layer of topcoat is sprayed on the primer using compressed air, the air pressure is 0.4MPa-0.6MPa. After the coating is completed, the stainless steel mold plate is placed in the air to dry for 15min-20min.

10. Application of the bottom surface heat-resistant coating system according to any one of claims 1 to 7 in glass thermal transfer frosting processing and molding, characterized in that: The following steps are involved: (i) Laying the glass flat on the side of the stainless steel mold plate coated with the coating system; (ii) programming the temperature of the stacked glass and stainless steel mold plates, first heating them to 500° C. to 550° C. at a heating rate of 10° C. / min to 20° C. / min, then heating them to 720° C. to 750° C. at a heating rate of 5° C. / min to 10° C. / min, and maintaining the temperature for 20 min to 40 min; (iii) performing programmed cooling on the stacked glass and stainless steel mold plates, first cooling to 590°C to 570°C at a cooling rate of 5°C / min to 10°C / min, and keeping the temperature for 20 to 30 minutes; then cooling to 200°C to 230°C at a cooling rate of 3°C / min to 5°C / min, and keeping the temperature for 20 to 30 minutes; (iv) Cooling naturally to 50°C to 60°C to obtain thermal transfer frosted glass.

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