Preparation and Application of a Heat-Insulating Powder Coating for Color Steel Tile Coils

Abstract

This invention relates to the field of coating technology, specifically to the preparation and application of a heat-insulating powder coating for color steel tile rolls. The invention provides a heat-insulating powder coating for color steel tile rolls, the raw materials for which include FEVE fluorocarbon resin, polyurethane resin, polyester resin, modifiers, isocyanate, defoamer, filler, pigment, and antistatic agent. The coating obtained by this invention has excellent heat insulation and flexibility properties, as well as high-efficiency water resistance and anti-aging effects, and has broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to the preparation and application of a heat-insulating color steel tile roll powder coating. Background Technology

[0002] Powder coatings eliminate the need for various harmful liquid chemical additives used in film formation, dispersion, wetting, leveling, and anti-corrosion / anti-mildew processes during manufacturing. Therefore, they are non-toxic, solvent-free, and free of toxic volatile substances. Consequently, powder coatings are non-toxic, fire-free, and produce no waste, complying with national environmental protection laws. As a granular product, powder coatings contain no water, eliminating concerns about bacterial contamination and requiring no preservatives, making them healthier. The odor of powder coatings dissipates very quickly. Powder coatings exhibit strong adhesion, a dense coating, high impact resistance, good toughness, and high edge coverage. They also possess excellent resistance to chemical corrosion and electrical insulation properties. Powder coating application requires no primer; a suitable film layer can be achieved in a single application, resulting in high efficiency and significant time savings. Since powder coatings contain neither water nor solvents, they are convenient and safe to transport.

[0003] Powder coatings are widely used for surface coating of color steel roofing sheets. However, due to the excellent thermal conductivity of color steel roofing sheets, it is difficult for ordinary metal workpieces to achieve the required thermal insulation performance through powder coating, which limits the application of powder coatings in certain specific fields. Furthermore, existing coatings for color steel roofing sheets rarely combine high-efficiency thermal insulation performance with toughness.

[0004] Therefore, providing a powder coating for color steel tile rolls that combines high-efficiency heat insulation and toughness is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This invention addresses the aforementioned technical problems by proposing a technical solution for the preparation and application of a heat-insulating color steel tile roll powder coating. The coating obtained by this invention possesses excellent heat insulation and flexibility, as well as superior resistance to boiling water and aging, demonstrating broad application prospects.

[0006] In one aspect, the present invention provides a heat-insulating color steel tile roll powder coating, wherein the raw materials for preparing the coating include FEVE fluorocarbon resin, polyurethane resin, polyester resin, modifier, isocyanate, defoamer, filler, pigment, and antistatic agent.

[0007] Furthermore, in the coating, the amount of FEVE fluorocarbon resin, by weight, is 10-20 parts, or 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, or any amount within the range of any two values.

[0008] Further, in the coating, the amount of polyurethane resin, by weight, is 20-50 parts, or an amount of 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, or 50 parts, or an amount within any range of two values. The polyurethane resin may be selected from polyurethanes with terminal hydroxyl groups.

[0009] Further, in the coating, the amount of polyurethane resin, by weight, is 10-20 parts, or 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, or any range between two such values. The polyester resin may be selected from terminal hydroxyl polyester resin.

[0010] Furthermore, in the coating, the amount of the modifying agent, by weight, is 5-10 parts, or 5, 6, 7, 8, 9, or 10 parts, or any amount within the range of any two values.

[0011] Furthermore, the modifying agent is obtained by hydroxylating sepiolite and hydroxyapatite, centrifuging, taking the solids, treating them with a titanate coupling agent solution, concentrating, drying, and pulverizing.

[0012] Furthermore, the reagent used in the hydroxylation treatment consists of hydrogen peroxide, hydrogen chloride, and water.

[0013] Furthermore, the titanate coupling agent solution is composed of bis(dioctyloxypyrophosphate) ethylene titanate, isopropyl tris(dioctylpyrophosphate) titanate, ethanol, and water.

[0014] Furthermore, the preparation of the modifying factor includes the following steps:

[0015] Step 1: Mix sepiolite and hydroxyapatite, add a reagent consisting of hydrogen peroxide, hydrogen chloride and water, stir, centrifuge to obtain a solid.

[0016] Step 2: The solid is mixed with a titanate coupling agent solution consisting of bis(dioctyloxypyrophosphate) ethylene titanate, isopropyl tris(dioctylpyrophosphate) titanate, ethanol and water to obtain the treated product;

[0017] Step 3: Concentrate, dry, and pulverize the above-mentioned material to obtain the modifying factor.

[0018] Furthermore, the mass ratio of sepiolite to hydroxyapatite is 1:0.3-0.6.

[0019] Furthermore, the total mass ratio of the sepiolite and hydroxyapatite to the reagent is 1:10-50.

[0020] Furthermore, the concentration of hydrogen peroxide in the reagent is 0.1-0.8 wt%.

[0021] Furthermore, the mass concentration of hydrogen chloride in the reagent is 1-5 wt%.

[0022] Furthermore, the mass ratio of the solid to the titanate coupling agent solution is 1:10-100.

[0023] Furthermore, in the titanate coupling agent solution, bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate are in a mass ratio of 1:0.5-0.8.

[0024] Furthermore, the total mass concentration of the bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in the titanate coupling agent solution is 2-15 wt%.

[0025] Furthermore, the total mass concentration of ethanol in the titanate coupling agent solution is 30-50 wt%.

[0026] Furthermore, in step 1, the stirring speed is 30-600 rpm, the stirring time is 0.3-4 hours, and the stirring temperature is 30-55℃.

[0027] Furthermore, in step 2, the stirring speed is 30-600 rpm, the stirring time is 0.5-7 hours, and the stirring temperature is 40-60℃.

[0028] Furthermore, in the coating, the amount of isocyanate used, by weight, is 8-14 parts, or the amount of 8, 9, 10, 11, 12, 13, or 14 parts, or the amount in any range between two values.

[0029] Furthermore, the isocyanate is an aliphatic isocyanate or an aromatic isocyanate, such as MDI or TDI.

[0030] Furthermore, in the coating, the amount of defoamer, by weight, is 0.5-3 parts, or the amount of 0.5, 1, 1.5, 2, 2.5, or 3 parts, or the amount within any two values.

[0031] Furthermore, the defoamer can be selected as benzoin.

[0032] Furthermore, in the coating, the amount of filler used, by weight, is 5-20 parts, or 5, 7, 9, 10, 12, 14, 16, 18, or 20 parts, or any amount within the range of any two values.

[0033] Furthermore, the filler may be selected from at least one of calcium carbonate, barium sulfate, calcium sulfate, talc, kaolin, silica, mica powder, wollastonite, and bentonite.

[0034] Furthermore, in the coating, the amount of pigment used, by weight, is 2-6 parts, or 2, 3, 4, 5, or 6 parts, or any amount within the range of any two values.

[0035] Furthermore, the pigment may be selected from at least one of iron oxide red, iron oxide yellow, carbon black, and iron oxide blue.

[0036] Furthermore, in the coating, the amount of antistatic agent, by weight, is 0.5-3 parts, or the amount of 0.5, 1, 1.5, 2, 2.5, or 3 parts, or the amount within any two of these values.

[0037] Furthermore, the antistatic agent may be selected from at least one of rosin and zinc succinate.

[0038] Furthermore, the raw materials for preparing the coating, by weight, include: 10-20 parts FEVE fluorocarbon resin, 20-50 parts polyurethane resin, 10-20 parts polyester resin, 5-10 parts modifier, 8-14 parts isocyanate, 0.5-3 parts defoamer, 5-20 parts filler, 2-6 parts pigment, and 0.5-3 parts antistatic agent.

[0039] On the other hand, the present invention also provides a method for preparing the coating, including weighing raw materials, mixing raw materials, melt extrusion, tableting, crushing, and screening.

[0040] On the other hand, the present invention also provides the application of preparing the powder coating into a coating.

[0041] On the other hand, the present invention also provides the application of preparing the coating obtained by the preparation method into a coating layer.

[0042] On the other hand, the present invention also provides the application of applying the powder coating to the surface of color steel tile rolls.

[0043] On the other hand, the present invention also provides a coating obtained by applying the above-described coating material.

[0044] On the other hand, the present invention also provides a coating material, comprising applying the above-mentioned coating to the surface of color steel tile rolls.

[0045] Beneficial effects

[0046] The raw materials for preparing the coating of this invention include FEVE fluorocarbon resin, polyurethane resin, polyester resin, modifier, isocyanate, defoamer, filler, pigment, and antistatic agent. The coating obtained by this invention has excellent heat insulation effect and flexibility, as well as high-efficiency water resistance and anti-aging effect, and has broad application prospects.

[0047] The coating obtained by the present invention exhibits excellent water resistance, remaining smooth and resistant to peeling even after being boiled in water at 100°C for 10 hours.

[0048] The coating obtained by the present invention passed the 2400-hour anti-aging test and has high anti-aging performance.

[0049] The coating obtained by the present invention has a thermal conductivity as low as 0.0462 W / (m·K), exhibiting excellent thermal insulation performance.

[0050] The coating obtained by the present invention exhibits a flexibility test value of 2mm, demonstrating excellent flexibility performance.

[0051] This invention utilizes a compound of sepiolite and hydroxyapatite, which undergoes hydroxylation treatment, centrifugation, and solidification. The solids are then treated with a titanate coupling agent solution, concentrated, dried, and pulverized to obtain a modifying agent, which is then used to prepare a coating. This process imparts excellent thermal insulation and flexibility to the coating. The modified sepiolite and hydroxyapatite used in this invention achieve a thermal conductivity as low as 0.0462 W / (m·K) and a flexibility test result of 2 mm. Furthermore, when the mass ratio of sepiolite to hydroxyapatite is 1:0.3-0.6, and the modifying agent obtained based on the modification process defined in this invention, it exhibits even better results in imparting efficient thermal insulation and flexibility to the coating.

[0052] In preparing the modifying agent, the present invention uses hydrogen peroxide for hydroxylation treatment to enhance the performance of the coating; the present invention uses a hydrogen peroxide solution with a mass concentration of 0.1-0.8%, and the coating prepared exhibits superior water resistance, anti-aging, heat insulation and flexibility properties.

[0053] In preparing the modifying agent, this invention uses bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in combination. The resulting coating exhibits better performance in terms of heat insulation and flexibility, with the two agents mutually promoting and enhancing each other. In particular, when the mass ratio of the two agents is 1:0.5-0.8, the coating effect is even more superior. Detailed Implementation

[0054] The present invention will be described below with reference to specific embodiments, and the effects of the present invention will be presented more clearly therefrom.

[0055] I. Preparation of Powder Coating for Heat-Insulating Color Steel Tile Coil

[0056] Paint 1:

[0057] Raw materials for preparation, by weight: 18 parts FEVE fluorocarbon resin (PF-501 type fluoropolymer resin, Hefei Dibang Nanotechnology Co., Ltd.), 35 parts polyurethane resin (hydroxyl-terminated polyurethane LR9100, Dongguan Jiurui Plastic Raw Materials Co., Ltd.), 15 parts polyester resin (Hyper H202, Wuhan Hyperbranched Resin Technology Co., Ltd.), 8 parts modifier, 10 parts isocyanate MDI, 0.8 parts defoamer benzoin, 14 parts filler calcium carbonate (light calcium carbonate selected from Shijiazhuang Yuanjing Mineral Products Co., Ltd., with a screening particle size of 0.5-10μm), 4 parts pigment iron oxide red (iron oxide red 103 selected from Hebei Zexu Building Materials Technology Development Co., Ltd., with a screening particle size of 0.5-10 micrometers), and 1 part antistatic agent zinc succinate;

[0058] The preparation of the modifying factor includes the following steps:

[0059] Step 1: Mix sepiolite and hydroxyapatite, add a reagent composed of hydrogen peroxide, hydrogen chloride and water, stir at 42℃ and 220 rpm for 2 hours, centrifuge at 2500 rpm for 20 minutes, remove the supernatant, and obtain the solid. The mass ratio of sepiolite to hydroxyapatite is 1:0.5, and the particle size of both is 0.02-10 μm. The mass ratio of the total mass of sepiolite and hydroxyapatite to the mass of the reagent is 1:30. The concentration of hydrogen peroxide in the reagent is 0.5 wt%, and the mass concentration of hydrogen chloride is 2.5 wt%.

[0060] Step 2: The solid material and a titanate coupling agent solution composed of titanate coupling agent, ethanol and water are stirred at 50°C and 180 rpm for 5 hours to obtain the treated material; wherein, the mass ratio of solid material to titanate coupling agent solution is 1:30, the titanate coupling agent is composed of bis(dioctyloxypyrophosphate) ethylene titanate and isopropyl tris(dioctylpyrophosphate) titanate in a mass ratio of 1:0.65, the total mass concentration of titanate coupling agent in titanate coupling agent solution is 8wt%, and the total mass concentration of ethanol in titanate coupling agent solution is 42wt%.

[0061] Step 3: Concentrate the above-treated material under reduced pressure at 57°C to 10% of the treated material mass, then dry it at 80°C to a water content of 0.8 wt%, pulverize it, and select particles with a particle size of 0.01-1 μm to obtain the modified factor.

[0062] Preparation of coatings:

[0063] Step 1: Weigh the raw materials according to the above dosage;

[0064] Step 2: Mix the raw materials in the reaction vessel;

[0065] Step 3: Feed the material into the extruder and melt-extrude it at a temperature of 95℃ with an extrusion screw speed of 35Hz; then, after pressing, crushing, and screening, select powder with a particle size between 200-400 mesh to obtain heat-insulating color steel tile roll powder coating 1.

[0066] Paint 2:

[0067] Raw materials for preparation, by weight: 18 parts FEVE fluorocarbon resin (PF-501 type fluoropolymer resin, Hefei Dibang Nanotechnology Co., Ltd.), 35 parts polyurethane resin (hydroxyl-terminated polyurethane LR9100, Dongguan Jiurui Plastic Raw Materials Co., Ltd.), 15 parts polyester resin (Hyper H202, Wuhan Hyperbranched Resin Technology Co., Ltd.), 8 parts modifier, 10 parts isocyanate MDI, 0.8 parts defoamer benzoin, 14 parts filler calcium carbonate (light calcium carbonate selected from Shijiazhuang Yuanjing Mineral Products Co., Ltd., with a screening particle size of 0.5-10μm), 4 parts pigment iron oxide red (iron oxide red 103 selected from Hebei Zexu Building Materials Technology Development Co., Ltd., with a screening particle size of 0.5-10 micrometers), and 1 part antistatic agent zinc succinate;

[0068] The preparation of the modifying factor includes the following steps:

[0069] Step 1: Mix sepiolite and hydroxyapatite, add a reagent composed of hydrogen peroxide, hydrogen chloride and water, stir at 50℃ and 200 rpm for 2.5 hours, centrifuge at 2000 rpm for 25 minutes, remove the supernatant, and obtain the solid. The mass ratio of sepiolite to hydroxyapatite is 1:0.3, and the particle size of both is 0.02-10 μm. The mass ratio of the total mass of sepiolite and hydroxyapatite to the mass of the reagent is 1:25. The concentration of hydrogen peroxide in the reagent is 0.7 wt%, and the mass concentration of hydrogen chloride is 2 wt%.

[0070] Step 2: The solid material and a titanate coupling agent solution composed of titanate coupling agent, ethanol and water are stirred at 45°C and 230 rpm for 4 hours to obtain the treated material; wherein, the mass ratio of solid material to titanate coupling agent solution is 1:28, the titanate coupling agent is composed of bis(dioctyloxypyrophosphate) ethylene titanate and isopropyl tris(dioctylpyrophosphate) titanate in a mass ratio of 1:0.7, the total mass concentration of titanate coupling agent in titanate coupling agent solution is 8wt%, and the total mass concentration of ethanol in titanate coupling agent solution is 38wt%.

[0071] Step 3: Concentrate the above-treated material under reduced pressure at 55°C to 12% of the treated material mass, then dry it at 82°C to a water content of 0.78 wt%, pulverize it, and select particles with a particle size of 0.01-1 μm to obtain the modified factor.

[0072] Preparation of coatings:

[0073] Step 1: Weigh the raw materials according to the above dosage;

[0074] Step 2: Mix the raw materials in the reaction vessel;

[0075] Step 3: Feed the material into the extruder and melt-extrude it at a temperature of 97℃ with an extrusion screw speed of 30Hz; then, after pressing, crushing, and screening, select powder with a particle size between 200-400 mesh to obtain heat-insulating color steel tile roll powder coating 2.

[0076] Paint 3:

[0077] The only difference between this coating and coating 1 is that the mass ratio of sepiolite to hydroxyapatite is 1:0.1; all other aspects are the same as coating 1.

[0078] Paint 4:

[0079] The only difference between this coating and coating 1 is that the mass ratio of sepiolite to hydroxyapatite is 1:0.2; all other aspects are the same as coating 1.

[0080] Paint 5:

[0081] The only difference between this coating and coating 1 is that the mass ratio of sepiolite to hydroxyapatite is 1:0.75; all other aspects are the same as coating 1.

[0082] Paint 6:

[0083] The only difference between this coating and coating 1 is that the mass ratio of sepiolite to hydroxyapatite is 1:0.9; all other aspects are the same as coating 1.

[0084] Paint 7:

[0085] The only difference between this reagent and coating 1 is that the concentration of hydrogen peroxide in the reagent is 0.05 wt%, while all other aspects are the same as those in coating 1.

[0086] Paint 8:

[0087] The only difference between this reagent and coating 1 is that the concentration of hydrogen peroxide in the reagent is 1.5 wt%, while everything else is the same as coating 1.

[0088] Paint 9:

[0089] The only difference between this coating and coating 1 is that the coupling agent in step 2 is bis(dioctyloxypyrophosphate) ethylene titanate, while all other aspects are the same as those in coating 1.

[0090] Paint 10:

[0091] The only difference between this coating and coating 1 is that the coupling agent in step 2 is isopropyltris(dioctylpyrophosphate)titanate, while all other components are the same as those in coating 1.

[0092] Paint 11:

[0093] The only difference from coating 1 is that the coupling agent in step 2 is composed of bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in a mass ratio of 1:0.3, and all other components are the same as those in coating 1.

[0094] Paint 12:

[0095] The only difference from coating 1 is that the coupling agent in step 2 is composed of bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in a mass ratio of 1:1, and all other components are the same as those in coating 1.

[0096] II. Performance Testing

[0097] 1. Water resistance and anti-aging effect test

[0098] The coatings 1-12 described above were sprayed onto a steel plate and cured at 220°C for 40 minutes. After cooling to room temperature, a coating with a thickness of approximately 180 micrometers was obtained, which were subsequently named coatings 1-12. The coated steel plate was then boiled in water at 100°C for 10 hours. The appearance of the coating surface was observed; if the coating showed no obvious peeling or fuzzing, the water resistance test was considered "passed". The artificial aging effect of the coatings was tested according to the method described in GB / T 23987-2009. A result indicating passing 2400 hours of testing was considered the maximum testing time. The water resistance and anti-aging effects are shown in Table 1.

[0099] Table 1: Tests on water resistance and anti-aging effects

[0100]

[0101]

[0102] 2. Heat insulation effect test

[0103] The coatings 1-12 described above were sprayed onto a steel plate and cured at 220°C for 40 minutes. After cooling to room temperature, a coating with a thickness of approximately 180 micrometers was obtained, which were sequentially named Coating 1-12. The thermal conductivity of the coatings was measured. The thermal conductivity of the coatings characterizes the thermal insulation effect of the coatings. The thermal conductivity coefficient was tested according to the method described in ASTM E-1461; the lower the thermal conductivity, the better the thermal insulation performance of the coating. The test results of the thermal insulation effect of each coating are shown in Table 2.

[0104] Table 2: Thermal Insulation Performance Test

[0105]

[0106]

[0107] 3. Flexibility test

[0108] The different powder coatings were sprayed onto PVC samples and cured. Then, in accordance with the national standard GB1731-79 "Test Method for Coating Flexibility", a cylindrical bending tester (QTY type-32) was used to test the coating. During the test, the coated PVC sample was bent on a shaft of different diameters. The smallest shaft diameter (mm) that did not cause damage to the coating after bending was used to represent the coating. The smaller the diameter, the better the coating flexibility. The specific flexibility test results are shown in Table 3.

[0109] Table 3: Flexibility Test

[0110]

[0111]

[0112] The results of the water resistance and anti-aging effect tests, heat insulation effect tests, and flexibility effect tests in Tables 1-3 above show that the coating obtained by the coating of the present invention has excellent heat insulation effect and flexibility, and also has efficient water resistance and anti-aging effect, and has broad application prospects.

[0113] The coating obtained by the present invention exhibits excellent water resistance, remaining smooth and resistant to peeling even after being boiled in water at 100°C for 10 hours.

[0114] The coating obtained by the present invention passed the 2400-hour anti-aging test and has high anti-aging performance.

[0115] The coating obtained by the present invention has a thermal conductivity as low as 0.0462 W / (m·K), exhibiting excellent thermal insulation performance.

[0116] The coating obtained by the present invention exhibits a flexibility test value of 2mm, demonstrating excellent flexibility performance.

[0117] This invention employs a compound of sepiolite and hydroxyapatite, which undergoes hydroxylation treatment, centrifugation, and solidification. The solids are then treated with a titanate coupling agent solution, concentrated, dried, and pulverized to obtain a modifying agent, which is then used to prepare a coating. This process imparts excellent thermal insulation and flexibility to the coating. As shown in the test results of coatings 1 and 3-6 in Tables 2-3, the modified sepiolite and hydroxyapatite used in this invention achieve a thermal conductivity as low as 0.0462 W / (m·K) and a flexibility test result of 2 mm. Furthermore, when the mass ratio of sepiolite to hydroxyapatite is 1:0.3-0.6, and the modifying agent obtained based on the modification process defined in this invention, it exhibits even better results in imparting efficient thermal insulation and flexibility to the coating.

[0118] In preparing the modifying agent, the present invention uses hydrogen peroxide for hydroxylation treatment to enhance the performance of the coating; and as can be seen from the test results of coatings 1 and 7-8 in Table 1-3, the coating prepared by using a hydrogen peroxide solution with a mass concentration of 0.1-0.8% exhibits better water resistance, anti-aging, heat insulation and flexibility.

[0119] The test results of coatings 1 and 9-10 in the table show that when preparing the modifying agent, using bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in combination results in coatings with better thermal insulation and flexibility, indicating a synergistic effect between the two. In particular, when the mass ratio of the two is 1:0.5-0.8, the coating effect is even more outstanding.

[0120] Those skilled in the art can make various modifications and variations to this invention. If these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention also intends to include these modifications and variations.

Claims

1. A heat-insulating powder coating for color steel tile rolls, characterized in that, The raw materials prepared by weight are: 10-20 parts FEVE fluorocarbon resin, 20-50 parts polyurethane resin, 10-20 parts polyester resin, 5-10 parts modifier, 8-14 parts isocyanate, 0.5-3 parts defoamer, 5-20 parts filler, 2-6 parts pigment, and 0.5-3 parts antistatic agent. The preparation of the modifying factor includes the following steps: Step 1: Mix sepiolite and hydroxyapatite, add a reagent consisting of hydrogen peroxide, hydrogen chloride and water, stir, centrifuge to obtain a solid. Step 2: The solid is mixed with a titanate coupling agent solution consisting of bis(dioctyloxypyrophosphate) ethylene titanate, isopropyl tris(dioctylpyrophosphate) titanate, ethanol and water to obtain the treated product; Step 3: Concentrate, dry, and pulverize the processed material to obtain the modified factor; The mass ratio of sepiolite to hydroxyapatite is 1:0.3-0.6; The concentration of hydrogen peroxide in the reagent is 0.1-0.8 wt%, and the mass concentration of hydrogen chloride is 1-5 wt%. The titanate coupling agent solution contains bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in a mass ratio of 1:0.5-0.

8.

2. The powder coating according to claim 1, characterized in that, The total mass concentration of the bis(dioctyloxypyrophosphate) ethylene titanate and isopropyltris(dioctylpyrophosphate) titanate in the titanate coupling agent solution is 2-15 wt%.

3. The powder coating according to claim 1, characterized in that, Isocyanates are either aliphatic or aromatic isocyanates.

4. The powder coating according to claim 1, characterized in that, The defoamer is benzoin.

5. The powder coating according to claim 1, characterized in that, The filler is at least one of calcium carbonate, barium sulfate, calcium sulfate, talc, kaolin, silica, mica powder, wollastonite, and bentonite.

6. A method for preparing a powder coating as described in any one of claims 1-5, characterized in that, This includes weighing raw materials, mixing raw materials, melt extrusion, tableting, crushing, and screening.

7. An application of the powder coating according to any one of claims 1-5 to prepare a coating.

8. An application of the coating obtained by the preparation method of claim 6 to prepare a coating layer.

9. An application of applying the powder coating of any one of claims 1-5 to the surface of color steel tile rolls.

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