Nanometer heat-insulation anti-corrosion color steel plate and preparation method thereof

Abstract

The preparation method comprises the following steps: firstly, uniformly stirring and mixing components such as saturated polyester resin, silicon dioxide, p-toluenesulfonic acid, a porous cerium oxide / graphene microsphere material, a zirconium-doped cerium oxide nanofiber material, a pigment, a curing agent, a de-foaming agent and de-ionized water to obtain a coating; and uniformly spraying the coating on the surface of the steel plate, and baking. The coating used in the invention is green and environment-friendly, plays a good role in protecting the surface of the steel plate, has good heat insulation and corrosion prevention effects, prolongs the service life of the color steel plate, and improves the use comfort of the color steel plate.

Description

Technical Field

[0001] The invention belongs to the technical field of color steel plate processing, and particularly relates to a nano heat-insulating and corrosion-resistant color steel plate and a preparation method thereof. Background Art

[0002] Color-coated steel sheets are a common building material, widely used for the walls and roofs of large public buildings, public factories, and integrated housing. However, they easily absorb solar heat, causing the surface temperature of the sheets to rise continuously, and the temperature of the inner layer also rises accordingly, leading to high indoor temperatures, which has a significant impact on material storage and people's normal living safety. Therefore, it is necessary to improve the thermal insulation effect of color-coated steel sheets.

[0003] In addition, color steel plates are installed outdoors and exposed to sunlight and rain for a long time. When used in factories, the environment is even more severe and they are easily corroded, which affects the service life of the color steel plates. Therefore, it is also very necessary to improve the anti-corrosion effect of color steel plates.

[0004] Patent application CN103321343A discloses a highly efficient thermally insulating color-coated steel sheet. The substrate is coated with an aluminum foil layer, and a PET coating is applied to the outer surface of the aluminum foil layer. The aluminum foil layer reflects sunlight and other light, thereby enhancing thermal insulation. The PET coating enhances corrosion resistance, thereby extending the service life of the aluminum foil layer and the color-coated steel sheet substrate. However, the corrosion resistance of PET is limited and cannot meet the requirements of color-coated steel sheets.

[0005] Applying coatings to color-coated steel sheets is the simplest and most effective technical method for achieving thermal insulation and corrosion protection. Existing color-coated steel sheet coatings are primarily solvent-based, using base materials such as weather-resistant polyester, thermosetting fluorocarbon resins, acrylic resins, and thermoplastic PVDF fluoropolymers. These coatings offer advantages such as strong adhesion, vibrant colors, and low cost. However, the addition of large amounts of organic solvents results in high levels of volatile organic compounds, a strong odor, and significant environmental pollution, impacting the health of construction workers and residents. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a nano thermal insulation and anti-corrosion color steel plate and a preparation method thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A method for preparing a nano thermal insulation and anti-corrosion colored steel plate comprises the following steps: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF (N,N-dimethylformamide), and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain zirconium-doped cerium oxide nanofiber material; (3) Stirring and mixing the following components in parts by weight to obtain a coating: 40-50 parts of saturated polyester resin, 5-6 parts of silicon dioxide, 3-4 parts of p-toluenesulfonic acid, 3-4 parts of porous cerium oxide / graphene microsphere material, 2-3 parts of zirconium-doped cerium oxide nanofiber material, 5-10 parts of pigment, 0.8-1 part of curing agent, 2-3 parts of defoaming agent, and 20-30 parts of deionized water; (4) The coating is evenly sprayed on the surface of the steel plate and baked to obtain the nano heat-insulating and anti-corrosion colored steel plate.

[0008] Preferably, in step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:3-4:6-8, and the concentration of the graphene oxide solution is 1-2 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

[0009] Preferably, in step (1), the electrostatic spraying conditions are: voltage 10-12 kV, and injection speed 0.001-0.002 mm / min.

[0010] Preferably, in step (1), a 0.2-0.3 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1200-1500 r / min is used as a coagulation liquid for wet collection.

[0011] Preferably, in step (1), the heating reaction conditions are: heating reaction at 100-120° C. for 6-8 hours.

[0012] Preferably, in step (1), the post-treatment includes: centrifuging the precipitate, drying it, heating it to 400-450°C at a rate of 5-8°C / min, and calcining it for 3-4 hours.

[0013] Preferably, in step (2), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:1-2, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:8-10:1-1.5.

[0014] Preferably, in step (2), the electrospinning conditions are: voltage 10-15 kV, nozzle diameter 0.5-0.7 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

[0015] Preferably, in step (2), the heat treatment conditions are: heating to 650-700°C at a rate of 1-2°C / min, and heat treatment for 8-10 hours.

[0016] Preferably, in step (3), the stirring conditions are: 300-500 r / min for 50-60 minutes.

[0017] Preferably, in step (3), the pigment is selected from any one of titanium dioxide, medium yellow powder or iron oxide red powder; the curing agent is dibenzoyl peroxide, and the defoaming agent is dimethyl silicone oil.

[0018] Preferably, in step (4), the thickness of the steel plate is 0.5 to 0.7 mm, and the coating spray thickness is 10 to 12 μm.

[0019] Preferably, in step (4), the baking conditions are: baking at 70-80° C. for 50-60 minutes.

[0020] A nano heat-insulating and anti-corrosion colored steel plate is obtained by the above-mentioned preparation method.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention first mixes saturated polyester resin, silicon dioxide, p-toluenesulfonic acid, porous cerium oxide / graphene microspheres, zirconium-doped cerium oxide nanofibers, pigment, curing agent, defoaming agent, and deionized water to obtain a coating. The coating is then evenly sprayed onto the surface of a steel plate and baked to obtain a nano-insulated, anti-corrosion color-coated steel plate. The coating used in the present invention is environmentally friendly, provides excellent protection for the steel plate surface, and has excellent heat insulation and anti-corrosion effects, extending the service life of the color-coated steel plate and improving its user comfort.

[0022] Specifically, the porous cerium oxide / graphene microsphere material is prepared by adding cerium nitrate hexahydrate and urea to a graphene oxide solution, stirring and mixing, electrostatically spraying, wet collection, heating and reacting, and post-treatment. The zirconium-doped cerium oxide nanofiber material is prepared by dissolving cerium nitrate hexahydrate and zirconium nitrate pentahydrate in DMF, adding polyvinyl pyrrolidone, stirring and mixing to obtain a spinning solution, electrospinning, and heat treatment.

[0023] The cerium oxide and graphene in the porous cerium oxide / graphene microsphere material work synergistically to improve thermal insulation and corrosion resistance. The zirconium oxide and cerium oxide in the zirconium-doped cerium oxide nanofiber material work synergistically to improve thermal insulation and corrosion resistance.

[0024] The porous cerium oxide / graphene microspheres and zirconium-doped cerium oxide nanofibers, in spherical and fibrous forms respectively, form a better thermal insulation structure and enhance the thermal insulation effect. They also have a better filling effect on the tiny pores on the steel plate surface, providing better corrosion protection. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The saturated polyester resin involved in the present invention, brand 3201, was purchased from Kunshan Dongya Resin Coating Factory; polyvinyl pyrrolidone, PVPK90, was purchased from Guangdong Yuemei Chemical Co., Ltd.

[0027] Example 1 A method for preparing a nano thermal insulation and anti-corrosion colored steel plate comprises the following steps: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF (N,N-dimethylformamide), and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain zirconium-doped cerium oxide nanofiber material; (3) The following components were stirred and mixed to obtain a coating: 4 kg saturated polyester resin, 0.5 kg silicon dioxide, 0.3 kg p-toluenesulfonic acid, 0.3 kg porous cerium oxide / graphene microsphere material, 0.2 kg zirconium-doped cerium oxide nanofiber material, 0.5 kg pigment, 0.08 kg curing agent, 0.2 kg defoaming agent, and 2 kg deionized water; (4) The coating is evenly sprayed on the surface of the steel plate and baked to obtain the nano heat-insulating and anti-corrosion colored steel plate.

[0028] Wherein, in step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:3:6, and the concentration of the graphene oxide solution is 1 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

[0029] The electrostatic spray conditions were: voltage 10 kV, injection speed 0.001 mm / min.

[0030] A 0.2 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1200 r / min was used as the coagulation liquid for wet collection.

[0031] The heating reaction conditions are: heating reaction at 100°C for 6 hours.

[0032] The post-treatment includes: taking out the precipitate by centrifugation, drying, heating to 400°C at a rate of 5°C / min, and calcining at the temperature for 3 hours.

[0033] In step (2), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:1, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:8:1.

[0034] The electrospinning conditions were as follows: voltage 10 kV, nozzle diameter 0.5 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

[0035] The heat treatment conditions are: heating to 650°C at a rate of 1°C / min and heat treatment for 8 hours.

[0036] In step (3), the stirring condition is: 300 r / min for 50 minutes.

[0037] The pigment is iron red powder; the curing agent is dibenzoyl peroxide; and the defoaming agent is dimethyl silicone oil.

[0038] In step (4), the thickness of the steel plate is 0.5 mm and the coating spray thickness is 10 μm.

[0039] The baking conditions are: 70°C for 50 minutes.

[0040] Example 2 A method for preparing a nano thermal insulation and anti-corrosion colored steel plate comprises the following steps: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF (N,N-dimethylformamide), and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain zirconium-doped cerium oxide nanofiber material; (3) The following components were stirred and mixed to obtain a coating: 5 kg of saturated polyester resin, 0.6 kg of silicon dioxide, 0.4 kg of p-toluenesulfonic acid, 0.4 kg of porous cerium oxide / graphene microsphere material, 0.3 kg of zirconium-doped cerium oxide nanofiber material, 1 kg of pigment, 0.1 kg of curing agent, 0.3 kg of defoaming agent, and 3 kg of deionized water; (4) The coating is evenly sprayed on the surface of the steel plate and baked to obtain the nano heat-insulating and anti-corrosion colored steel plate.

[0041] Wherein, in step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:4:8, and the concentration of the graphene oxide solution is 2 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

[0042] The electrostatic spraying conditions were: voltage 12 kV, injection speed 0.002 mm / min.

[0043] A 0.3 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1500 r / min was used as the coagulation liquid for wet collection.

[0044] The heating reaction conditions are: heating reaction at 120°C for 8 hours.

[0045] The post-treatment includes: taking out the precipitate by centrifugation, drying, heating to 450°C at 8°C / min, and calcining for 4 hours.

[0046] In step (2), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:2, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:10:1.5.

[0047] The electrospinning conditions were as follows: voltage 15 kV, nozzle diameter 0.7 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

[0048] The heat treatment conditions are: heating to 700°C at 2°C / min and heat treatment for 10 hours.

[0049] In step (3), the stirring condition is: 500 r / min for 60 minutes.

[0050] The pigment is iron red powder; the curing agent is dibenzoyl peroxide; and the defoaming agent is dimethyl silicone oil.

[0051] In step (4), the thickness of the steel plate is 0.7 mm and the coating spray thickness is 12 μm.

[0052] The baking conditions are: 80°C for 60 minutes.

[0053] Example 3 A method for preparing a nano thermal insulation and anti-corrosion colored steel plate comprises the following steps: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF (N,N-dimethylformamide), and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain zirconium-doped cerium oxide nanofiber material; (3) The following components were stirred and mixed to obtain a coating: 4 kg saturated polyester resin, 0.6 kg silicon dioxide, 0.3 kg p-toluenesulfonic acid, 0.4 kg porous cerium oxide / graphene microsphere material, 0.2 kg zirconium-doped cerium oxide nanofiber material, 1 kg pigment, 0.08 kg curing agent, 0.3 kg defoaming agent, and 2 kg deionized water; (4) The coating is evenly sprayed on the surface of the steel plate and baked to obtain the nano heat-insulating and anti-corrosion colored steel plate.

[0054] Wherein, in step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:4:6, and the concentration of the graphene oxide solution is 2 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

[0055] The electrostatic spraying conditions were: voltage 10 kV, injection speed 0.002 mm / min.

[0056] A 0.3 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1200 r / min was used as the coagulation liquid for wet collection.

[0057] The heating reaction conditions are: heating reaction at 100°C for 8 hours.

[0058] The post-treatment includes: taking out the precipitate by centrifugation, drying, heating to 450°C at a rate of 5°C / min, and calcining for 3 hours.

[0059] In step (2), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:2, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:8:1.5.

[0060] The electrospinning conditions were as follows: voltage 10 kV, nozzle diameter 0.7 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

[0061] The heat treatment conditions are: heating to 700°C at 1°C / min and keeping the temperature for 8 hours.

[0062] In step (3), the stirring condition is: 500 r / min for 50 minutes.

[0063] The pigment is iron red powder; the curing agent is dibenzoyl peroxide; and the defoaming agent is dimethyl silicone oil.

[0064] In step (4), the thickness of the steel plate is 0.7 mm and the coating spray thickness is 10 μm.

[0065] The baking conditions are: 80°C for 50 minutes.

[0066] Example 4 A method for preparing a nano thermal insulation and anti-corrosion colored steel plate comprises the following steps: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF (N,N-dimethylformamide), and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain zirconium-doped cerium oxide nanofiber material; (3) The following components were stirred and mixed to obtain a coating: 4.5 kg saturated polyester resin, 0.55 kg silicon dioxide, 0.35 kg p-toluenesulfonic acid, 0.35 kg porous cerium oxide / graphene microsphere material, 0.25 kg zirconium-doped cerium oxide nanofiber material, 0.7 kg pigment, 0.09 kg curing agent, 0.25 kg defoaming agent, and 2.5 kg deionized water; (4) The coating is evenly sprayed on the surface of the steel plate and baked to obtain the nano heat-insulating and anti-corrosion colored steel plate.

[0067] Wherein, in step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:3.5:7, and the concentration of the graphene oxide solution is 1.5 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

[0068] The electrostatic spraying conditions were: voltage 11 kV, injection speed 0.001 mm / min.

[0069] A 0.25 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1300 r / min was used as the coagulation liquid for wet collection.

[0070] The heating reaction conditions are: heating reaction at 110°C for 7 hours.

[0071] The post-treatment includes: taking out the precipitate by centrifugation, drying, heating to 420°C at 7°C / min, and calcining at the temperature for 3.5 hours.

[0072] In step (2), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:1.5, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:9:1.2.

[0073] The electrospinning conditions were as follows: voltage 12 kV, nozzle diameter 0.6 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

[0074] The heat treatment conditions are: heating to 680°C at a rate of 1.5°C / min and heat treatment at this temperature for 9 hours.

[0075] In step (3), the stirring condition is: stirring at 400 r / min for 55 minutes.

[0076] The pigment is iron red powder; the curing agent is dibenzoyl peroxide; and the defoaming agent is dimethyl silicone oil.

[0077] In step (4), the thickness of the steel plate is 0.6 mm and the coating spray thickness is 11 μm.

[0078] The baking conditions are: 75°C for 55 minutes.

[0079] Comparative Example 1 A method for preparing a color steel plate comprises the following steps: (1) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF (N,N-dimethylformamide), and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain zirconium-doped cerium oxide nanofiber material; (2) The following components were stirred and mixed to obtain a coating: 4 kg of saturated polyester resin, 0.5 kg of silicon dioxide, 0.3 kg of p-toluenesulfonic acid, 0.2 kg of zirconium-doped cerium oxide nanofiber material, 0.5 kg of pigment, 0.08 kg of curing agent, 0.2 kg of defoaming agent, and 2 kg of deionized water; (3) The paint is evenly sprayed on the surface of the steel plate and baked to obtain the color steel plate.

[0080] Wherein, in step (1), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:1, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:8:1.

[0081] The electrospinning conditions were as follows: voltage 10 kV, nozzle diameter 0.5 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

[0082] The heat treatment conditions are: heating to 650°C at a rate of 1°C / min and heat treatment for 8 hours.

[0083] In step (2), the stirring condition is: 300 r / min for 50 minutes.

[0084] The pigment is iron red powder; the curing agent is dibenzoyl peroxide; and the defoaming agent is dimethyl silicone oil.

[0085] In step (3), the thickness of the steel plate is 0.5 mm and the coating spray thickness is 10 μm.

[0086] The baking conditions are: 70°C for 50 minutes.

[0087] Comparative Example 2 A method for preparing a color steel plate comprises the following steps: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) The following components were stirred and mixed to obtain a coating: 4 kg saturated polyester resin, 0.5 kg silicon dioxide, 0.3 kg p-toluenesulfonic acid, 0.3 kg porous cerium oxide / graphene microsphere material, 0.5 kg pigment, 0.08 kg curing agent, 0.2 kg defoaming agent, and 2 kg deionized water; (3) The paint is evenly sprayed on the surface of the steel plate and baked to obtain the color steel plate.

[0088] Wherein, in step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:3:6, and the concentration of the graphene oxide solution is 1 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

[0089] The electrostatic spray conditions were: voltage 10 kV, injection speed 0.001 mm / min.

[0090] A 0.2 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1200 r / min was used as the coagulation liquid for wet collection.

[0091] The heating reaction conditions are: heating reaction at 100°C for 6 hours.

[0092] The post-treatment includes: taking out the precipitate by centrifugation, drying, heating to 400°C at a rate of 5°C / min, and calcining at the temperature for 3 hours.

[0093] In step (2), the stirring condition is: 300 r / min for 50 minutes.

[0094] The pigment is iron red powder; the curing agent is dibenzoyl peroxide; and the defoaming agent is dimethyl silicone oil.

[0095] In step (3), the thickness of the steel plate is 0.5 mm and the coating spray thickness is 10 μm.

[0096] The baking conditions are: 70°C for 50 minutes.

[0097] Test example The performance tests of the color-coated steel plates obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were respectively carried out, specifically including: 1. Light reflectivity: Use an integrating sphere reflectivity tester to test the reflectivity of infrared light and visible light.

[0098] 2. Anti-corrosion effect: Salt spray resistance: Tested in accordance with GB / T 1771-2006 "Paints and varnishes - Determination of resistance to neutral salt spray", with a test time of 168 hours; Acid resistance: Refer to GB / T 9274-1988 "Determination of resistance of paints and varnishes to liquid media", the test environment is 50% mass concentration sulfuric acid solution, and the test time is 168 hours; Alkali resistance: Refer to GB / T 9274-1988 "Paints and varnishes - Determination of resistance to liquid media", the test environment is 30% mass concentration of sodium hydroxide solution, and the test time is 168 hours.

[0099] The test results are shown in Table 1.

[0100] Table 1. Color-coated steel plate performance test As can be seen from Table 1, the color-coated steel plates of Examples 1 to 4 have high reflectivity to both infrared light and visible light, high heat insulation effect, and good anti-corrosion effect.

[0101] In Comparative Example 1, the porous cerium oxide / graphene microsphere material is omitted, and in Comparative Example 2, the zirconium-doped cerium oxide nanofiber material is omitted. The thermal insulation effect and the anti-corrosion effect are significantly deteriorated, indicating that the spherical porous cerium oxide / graphene microsphere material and the fibrous zirconium-doped cerium oxide nanofiber material improve the thermal insulation effect and the anti-corrosion effect through the combination of special microstructures and the synergistic effect between specific components.

[0102] While the present invention is illustrated by the aforementioned embodiments, the present invention is not limited to these embodiments, nor does it necessarily rely on these embodiments for implementation. Those skilled in the art will appreciate that any improvements to the present invention, equivalent replacements for individual raw materials in the present invention, additions of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A method for preparing nano thermal insulation and anti-corrosion colored steel plate, characterized in that: The steps include: (1) Preparation of porous cerium oxide / graphene microsphere material: adding cerium nitrate hexahydrate and urea to graphene oxide solution, stirring and mixing, electrostatic spraying, wet collection, heating reaction, and post-treatment to obtain porous cerium oxide / graphene microsphere material; (2) Preparation of zirconium-doped cerium oxide nanofiber material: Cerium nitrate hexahydrate and zirconium nitrate pentahydrate were stirred and dissolved in DMF, and then polyvinyl pyrrolidone was added and stirred to obtain a spinning solution, electrospun, and heat-treated to obtain a zirconium-doped cerium oxide nanofiber material; (3) Stirring and mixing the following components in parts by weight to obtain a coating: 40-50 parts of saturated polyester resin, 5-6 parts of silicon dioxide, 3-4 parts of p-toluenesulfonic acid, 3-4 parts of porous cerium oxide / graphene microsphere material, 2-3 parts of zirconium-doped cerium oxide nanofiber material, 5-10 parts of pigment, 0.8-1 part of curing agent, 2-3 parts of defoaming agent, and 20-30 parts of deionized water; (4) The coating is evenly sprayed on the surface of the steel plate and baked to obtain the nano heat-insulating and anti-corrosion colored steel plate.

2. The preparation method according to claim 1, characterized in that In step (1), the molar ratio of graphene oxide contained in cerium nitrate hexahydrate, urea, and graphene oxide solution is 1:3-4:6-8, and the concentration of the graphene oxide solution is 1-2 mg / mL, which is obtained by stirring and dispersing graphene oxide in deionized water.

3. The preparation method according to claim 1, characterized in that In step (1), the electrostatic spraying conditions are: voltage 10-12 kV, injection speed 0.001-0.002 mm / min.

4. The preparation method according to claim 1, characterized in that In step (1), a 0.2-0.3 mg / mL hexadecyltrimethylammonium bromide aqueous solution with a stirring rate of 1200-1500 r / min is used as a coagulation liquid for wet collection.

5. The preparation method according to claim 1, characterized in that In step (1), the heating reaction conditions are: heating reaction at 100-120°C for 6-8 hours.

6. The preparation method according to claim 1, characterized in that In step (2), the molar ratio of cerium nitrate hexahydrate to zirconium nitrate pentahydrate is 10:1-2, and the mass ratio of cerium nitrate hexahydrate, DMF, and polyvinyl pyrrolidone is 1:8-10:1-1.

5.

7. The preparation method according to claim 1, characterized in that In step (2), the electrospinning conditions are: voltage 10-15 kV, nozzle diameter 0.5-0.7 mm, angle between the nozzle and the horizontal plane 15°, and curing distance 15 cm.

8. The preparation method according to claim 1, characterized in that In step (2), the heat treatment conditions are: heating to 650-700°C at a rate of 1-2°C / min, and heat treatment for 8-10 hours.

9. The preparation method according to claim 1, characterized in that In step (4), the thickness of the steel plate is 0.5 to 0.7 mm, and the coating spray thickness is 10 to 12 μm; The baking conditions are: baking at 70-80°C for 50-60 minutes.

10. A nano thermal insulation and anti-corrosion colored steel plate, characterized in that: The invention is obtained by the preparation method according to any one of claims 1 to 9.

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