Frame color plate for automobile window and production process

Abstract

The invention relates to the technical field of color plate manufacturing, and particularly discloses a frame color plate for an automobile window and a production process. The frame color plate for the automobile window comprises a stainless steel base material, a passivation layer, an adhesive layer and a coating, and the coating is prepared from, by weight, 80-90 parts of alkyd resin, 15-20 parts of silicon dioxide, 25-28 parts of modified polyester fibers, 8-12 parts of a silane coupling agent KH-570, 20-30 parts of ethylene glycol, 12-15 parts of n-butyl alcohol, 10-15 parts of aluminum dihydrogen phosphate, 26-30 parts of modified talcum powder and 16-18 parts of N, N-dimethylformamide. The cleaning agent is prepared from the following components in parts by weight: 20-30 parts of N, N-dimethylformamide, 8-12 parts of sodium methylene bis-naphthalene sulfonate and 110-120 parts of deionized water. The prepared coating has good mechanical property, adhesive force and wear resistance, after long-term use, the surface layer of the color plate cannot be scratched or peeled off, and the durability of the color plate is further prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of color plate manufacturing, and more specifically, to a color plate for a car window frame and a production process. Background Art

[0002] Colored plate for automobile window frame is a material used for decoration and protection of automobile window frames. It is usually made of color coated steel plate, with stainless steel substrate as the base, coated with a weather-resistant and highly corrosion-resistant surface layer. It has the advantages of good corrosion resistance, bright colors, beautiful appearance, convenient processing and forming, and the original strength of steel plate. Colored plate frame can enhance the stability of car window glass and prevent glass from bursting due to external impact or temperature changes.

[0003] Color coated steel plates usually include stainless steel substrate, pretreatment layer, primer layer and topcoat layer. The pretreatment layer is located between the substrate and the primer layer, and its main purpose is to enhance the adhesion between the substrate and the primer. The primer layer is an important protective layer for color plates, which can prevent the substrate from rusting and corrosion. The topcoat layer is the outermost layer of the color plate, which mainly provides aesthetics and weather resistance.

[0004] With the long-term use of color coated steel plates, the topcoat layer is easily exposed to wind and sun, causing surface wear and scratches, which in turn affects the durability of the color coated steel plates. Summary of the invention

[0005] In order to improve the problem that the surface of the color coated steel plate may be scratched or worn, the present application provides a color plate for a car window frame and a production process.

[0006] In the first aspect, the present application provides a color plate for a car window frame, which adopts the following technical solution: A color plate for a car window frame comprises a stainless steel substrate, a passivation layer, an adhesive layer and a coating. The coating comprises the following raw materials in parts by weight: 80-90 parts of alkyd resin, 15-20 parts of silicon dioxide, 25-28 parts of modified polyester fiber, 8-12 parts of silane coupling agent KH-570, 20-30 parts of ethylene glycol, 12-15 parts of n-butanol, 10-15 parts of aluminum dihydrogen phosphate, 26-30 parts of modified talc, 16-18 parts of N,N-dimethylformamide, 8-12 parts of sodium methylene bisnaphthalene sulfonate and 110-120 parts of deionized water.

[0007] By adopting the above technical solution, alkyd resin, as the main film-forming substance, provides the gloss, toughness and adhesion of the coating. Alkyd resin has good wear resistance, weather resistance and insulation, which helps to improve the overall performance of the coating. Silica can fill the structural pores of the coating, improve the hardness and wear resistance of the coating, and improve the weather resistance and chemical stability of the coating. The modified polyester fiber has good flexibility, enhances the tensile strength and heat resistance of the coating, and improves the crack resistance of the coating.

[0008] Silane coupling agent KH-570 makes the components in the coating raw materials mix evenly, has good dispersibility and stability, improves the bonding performance between organic and inorganic materials in the coating, and improves the adhesion of the coating to the stainless steel substrate. Ethylene glycol and n-butanol are used as solvents to help other components disperse evenly in the coating and adjust the drying speed and fluidity of the coating. Aluminum dihydrogen phosphate improves the corrosion resistance of the coating and enhances the cohesion and adhesion of the coating. Modified talcum powder can fill the pores of the coating, improve the processing performance of the coating, and increase the hardness and wear resistance of the coating.

[0009] N,N-dimethylformamide, as an organic solvent, helps the preparation and construction of the coating, and affects the leveling and drying speed of the coating. Sodium methylenebisnaphthalene sulfonate, as a surfactant, helps improve the dispersion and stability of the coating components, and improves the leveling and glossiness of the coating. The coating prepared by mixing these components is applied to the stainless steel substrate to form a protective layer with excellent adhesion, hardness, wear resistance, weather resistance and chemical stability. The coating can resist corrosion factors in the environment, extend the service life of the stainless steel substrate, and provide good mechanical properties, wear resistance, anti-fouling and other functions.

[0010] Optionally, the method for preparing the modified polyester fiber comprises the following steps: (1) PET, pearl powder and sodium carboxymethyl cellulose are mixed uniformly, dried at 140-145° C. for 20-24 hours, extruded, pelletized and spun to obtain polyester fibers; (2) dispersing the polyester fiber in a sodium hydroxide solution, soaking for 1-2 hours, washing with water, and then dispersing it in deionized water, adding the modified graphene, ultrasonicating for 2-3 hours, filtering, and drying to obtain a mixture; (3) Spraying the mixture of step (2) with a dextrin glue aqueous solution and drying to obtain a modified polyester fiber.

[0011] By adopting the above technical scheme, PET, pearl powder and sodium carboxymethyl cellulose are dried to remove moisture and volatile substances in the raw materials, while PET is softened and better combined with other ingredients, extruded and spun to obtain polyester fibers with good strength, wear resistance and corrosion resistance.

[0012] The sodium hydroxide solution erodes the surface of the polyester fiber to a certain extent, making the surface of the polyester fiber rough and increasing its bonding strength with other substances. Modified graphene is added. Modified graphene is a material with excellent thermal conductivity and mechanical properties. Modified graphene can be loaded on the surface and pores of the polyester fiber to improve the comprehensive performance of the polyester fiber.

[0013] The mixture is sprayed with a dextrin glue aqueous solution, which has a certain bonding effect and can fix the modified graphene more firmly on the polyester fiber, thereby improving the comprehensive properties of the polyester fiber, such as mechanical properties, wear resistance and corrosion resistance, and is subsequently applied to the coating to improve the corresponding performance of the coating.

[0014] Optionally, the mass ratio of the polyester fiber, modified graphene and dextrin glue solution is 1g:50-60mg:0.1-0.2g.

[0015] By adopting the above technical scheme, the mass ratio of polyester fiber, modified graphene and dextrin glue aqueous solution is further limited within a certain range, and the obtained modified polyester fiber has better comprehensive performance, polyester fiber has good flexibility and strength, modified graphene has good heat dissipation, wear resistance and corrosion resistance, and modified graphene can be loaded on the surface of polyester fiber to improve the flexibility, impact resistance and wear resistance of polyester fiber. The dextrin glue aqueous solution has strong adhesion and film-forming properties, so that the modified graphene adheres to the surface of polyester fiber, increasing the adhesion and stability of polyester fiber. Subsequent application in coating increases the mechanical properties, stability and wear resistance of the coating, and extends the service life of the coating.

[0016] Optionally, the preparation method of the modified graphene comprises the following steps: dispersing the graphene in a sodium hydroxide solution, stirring for 1-2 hours, washing with water, dispersing the graphene in a hydrochloric acid solution, stirring for 2-3 hours, washing with water, and then dispersing the graphene in deionized water, adding nano nickel, hydroxyethyl cellulose and sodium polystyrene sulfonate, stirring at a temperature of 60-65° C. for 2-3 hours, After drying, modified graphene is obtained.

[0017] By adopting the above technical solution, the sodium hydroxide solution removes some impurities on the graphene surface, which helps to better disperse the graphene. The hydrochloric acid solution further treats the graphene surface, which helps to remove more impurities and helps to better disperse the graphene.

[0018] Nano nickel has good strength and hardness, and can be loaded on the surface of graphene to increase the specific surface area of ​​graphene. Hydroxyethyl cellulose has good thickening and stability, which not only helps to improve the dispersion and stability of graphene, but also makes nano nickel adhere evenly to the surface of graphene, improving the mechanical strength and wear resistance of modified graphene. Sodium polystyrene sulfonate has good dispersibility, which helps to evenly disperse graphene and nano nickel and prevent them from agglomerating and precipitating.

[0019] The modified graphene prepared by mixing various components has good corrosion resistance, wear resistance and hardness. It is subsequently applied to polyester fibers to improve the corresponding properties of polyester fibers, which helps to subsequently improve the construction performance and coating quality of the coating.

[0020] Optionally, the preparation method of the modified talcum powder comprises the following steps: (1) dispersing talc in dilute hydrochloric acid, stirring for 1-2 hours, washing with water, and then calcining at a temperature of 300-320° C. for 3-4 hours to obtain pretreated talc; (2) Dispersing the modified carbon fiber in deionized water, adding the pretreated talcum powder of step (1), stirring at a temperature of 70-75° C. for 1-2 hours, then adding lignin glue, continuing to stir, drying, and grinding to obtain modified talcum powder.

[0021] By adopting the above technical scheme, talc powder is dispersed in dilute hydrochloric acid and the talc powder is initially acidified, which may help remove certain impurities and change its surface properties. Calcination further removes impurities and changes the structure and properties of the talc powder. The pretreated talc powder has good dispersibility and adsorption, which is helpful for subsequent mixing with other components.

[0022] The modified carbon fiber has good toughness, strength and wear resistance, and can be loaded in the pores and on the surface of talcum powder particles to increase the mechanical strength of the talcum powder. The lignin glue has a certain viscosity, which makes the modified carbon fiber and talcum powder particles adhere tightly, improving the mechanical properties of the talcum powder. It is subsequently used in coatings to improve the mechanical properties, wear resistance and adhesion of the coatings, and extend the service life of the coatings.

[0023] Optionally, the mass ratio of the talcum powder, the modified carbon fiber and the lignin glue is 1:0.6-0.8:0.08-0.09.

[0024] By adopting the above-mentioned technical scheme, further limit the mass ratio of talcum powder, modified carbon fiber and lignin glue within a certain range, the talcum powder obtained has better comprehensive performance, talcum powder has good wear resistance, corrosion resistance, modified carbon fiber has high strength, high modulus and corrosion resistance, can be loaded on the inside and surface of talcum powder particles, increase the mechanical properties of talcum powder, such as hardness, wear resistance and impact resistance. Lignin glue has good bonding properties, so that modified carbon fiber adheres to the talcum powder surface, improves the mechanical strength, adhesion and corrosion resistance of modified talcum powder. Subsequent application in coating, can enhance the toughness, wear resistance and corrosion resistance of coating, improve the bonding strength between coating and stainless steel surface, prevent coating from falling off, make coating more durable.

[0025] Optionally, the preparation method of the modified carbon fiber comprises the following steps: dispersing short carbon fibers with a length of 50-100 μm in ammonia water, stirring for 20-25 min, washing with water, drying, calcining at a temperature of 800-850°C for 2-3 h under the protection of an inert gas, and then dispersing in deionized water, adding tetrahydrofuran, nano-silver, nano-titanium dioxide, and water-soluble chitosan, stirring at a temperature of 70-75°C for 1-2 h, drying, and grinding so that the length of the short carbon fibers drops to less than 0.5 μm and the aspect ratio is less than 10, thereby obtaining modified carbon fibers.

[0026] By adopting the above technical scheme, short carbon fibers are dispersed in ammonia water, and the ammonia water corrodes the surface of the carbon fibers to a certain extent, changing the properties of the carbon fiber surface, increasing the active sites or functional groups on its surface, and calcination further changes the structure and properties of the carbon fibers, thereby improving their stability and performance.

[0027] Tetrahydrofuran has good dispersibility, which helps the uniform dispersion and penetration of nanosilver, nanotitanium dioxide and water-soluble chitosan on the surface of carbon fiber. Nanosilver has excellent antibacterial properties and can be loaded on the surface of carbon fiber to improve the antibacterial properties of carbon fiber. Nanotitanium dioxide has anti-ultraviolet properties, weather resistance and chemical stability, and improves the corresponding properties of the coating. Water-soluble chitosan has good biocompatibility and adhesion, which improves the binding force between carbon fiber and nanosilver and nanotitanium dioxide. Various components are mixed and subsequently applied to the coating to increase the mechanical strength, corrosion resistance, antibacterial properties, electrical conductivity, weather resistance and biocompatibility of the coating, ensuring that the coating can be firmly attached to the substrate.

[0028] Optionally, the thickness of the passivation layer is 15-20 μm, the thickness of the adhesive layer is 6-9 μm, and the thickness of the coating is 22-25 μm.

[0029] By adopting the above technical solution, the thickness of the passivation layer, the adhesive layer and the coating is further limited, the obtained coating has excellent performance, and the prepared automobile window frame color plate has excellent mechanical strength, wear resistance and corrosion resistance.

[0030] In a second aspect, the present application provides a production process for a color plate for a car window frame, comprising the following steps: mixing alkyd resin, silica, modified polyester fiber, silane coupling agent KH-570, ethylene glycol, n-butanol, aluminum dihydrogen phosphate, modified talcum powder, N,N-dimethylformamide, sodium methylenebisnaphthalene sulfonate and deionized water, stirring at a temperature of 75-80°C for 25-30 minutes, and then melt-extruding, granulating, and crushing to obtain a coating raw material; The passivation solution, adhesive solution and coating raw materials are sequentially coated on a stainless steel substrate to obtain a color plate for a car window frame.

[0031] By adopting the above technical scheme, the steps of preparing the automobile window frame color plate by the above method are simple, and the obtained automobile window frame color plate has good mechanical strength, adhesion and corrosion resistance, thereby extending the life of the automobile window frame color plate.

[0032] Optionally, the coating method is spraying, the drying temperature after spraying is 150-160° C., and the drying time is 1-2 minutes.

[0033] By adopting the above technical solution, the film obtained by spraying has good uniformity, and the coating obtained by drying has excellent comprehensive performance, which prolongs the service life of the color plate for the automobile window frame.

[0034] In summary, this application has the following beneficial effects: 1. In this application, alkyd resin is used as the main film-forming substance to provide gloss, toughness and adhesion to the coating. Alkyd resin has good wear resistance, weather resistance and insulation, which helps to improve the overall performance of the coating. The modified polyester fiber has good flexibility, enhances the tensile strength and heat resistance of the coating, and improves the crack resistance of the coating.

[0035] 2. The modified talc in this application can fill the pores of the coating, improve the processing performance of the coating, and improve the hardness and wear resistance of the coating; the silane coupling agent KH-570 makes the components in the coating raw materials mix evenly, has good dispersibility and stability, improves the bonding performance between the organic and inorganic materials in the coating, and improves the adhesion of the coating to the stainless steel substrate.

[0036] 3. The coating prepared by mixing the components in this application is coated on a stainless steel substrate to form a protective layer with excellent adhesion, hardness, wear resistance, weather resistance and chemical stability. The coating can resist corrosion factors in the environment, extend the service life of the stainless steel substrate, and provide good mechanical properties, wear resistance, anti-fouling and other functions. DETAILED DESCRIPTION

[0037] Preparation example of modified polyester fiber Preparation Example 1-1 The preparation method of modified polyester fiber comprises the following steps: (1) 30 kg of PET, 15 kg of pearl powder, and 6 kg of sodium carboxymethyl cellulose were mixed uniformly, dried at 145° C. for 24 h, extruded, pelletized, and spun to obtain polyester fibers; (2) dispersing the polyester fiber in 60 L of a 10% sodium hydroxide solution, soaking for 2 h, washing with water, and then dispersing the polyester fiber in 80 L of deionized water, adding the modified graphene, ultrasonicating for 3 h, filtering, and drying to obtain a mixture; (3) Spraying the mixture of step (2) with a dextrin glue aqueous solution and drying to obtain a modified polyester fiber.

[0038] In step (1), a screw extruder is used for extrusion, the temperatures of the five zones are 250° C., 250° C., 270° C., 260° C., and 270° C., the spinning temperature is 250° C., and the spinning speed is 3000 m / min.

[0039] The mass ratio of polyester fiber, modified graphene and dextrin glue solution is 1g:50mg:0.2g.

[0040] Dextrin glue solution: 10 kg of white dextrin was dissolved in 50 L of deionized water and stirred at 60° C. for 1 h to obtain a dextrin glue solution. White dextrin was purchased from Shandong Guohua Chemical Co., Ltd.; the required amount was taken to prepare the modified polyester fiber.

[0041] The preparation method of modified graphene comprises the following steps: dispersing 3 kg of graphene in 9 L of sodium hydroxide solution with a mass fraction of 6%, stirring for 2 hours, washing with water, and then dispersing in 10 L of hydrochloric acid solution with a mass fraction of 8%, stirring for 3 hours, washing with water, and then dispersing in 20 L of deionized water, adding 0.9 kg of nano nickel, 0.5 kg of hydroxyethyl cellulose and 0.2 kg of sodium polystyrene sulfonate, stirring at a temperature of 65°C for 3 hours, and drying to obtain modified graphene.

[0042] Preparation Example 1-2 The difference from Preparation Example 1-1 is that in step (2), no modified graphene is added.

[0043] Preparation Example 1-3 The difference from Preparation Example 1-1 is that in step (3), no dextrin glue solution is added.

[0044] Preparation Example 1-4 The difference from Preparation Example 1-1 is that the mass ratio of the polyester fiber, the modified graphene and the dextrin glue solution is 1g:60mg:0.1g.

[0045] Preparation Example 1-5 The difference from Preparation Example 1-1 is that the mass ratio of the polyester fiber, the modified graphene and the dextrin glue solution is 1g:30mg:0.8g.

[0046] Preparation Example 1-6 The difference from Preparation Example 1-1 is that nano-nickel is not added in the preparation method of modified graphene.

[0047] Preparation Example 1-7 The difference from Preparation Example 1-1 is that hydroxyethyl cellulose is not added in the preparation method of modified graphene.

[0048] Preparation example of modified talc Preparation Example 2-1 The preparation method of modified talcum powder comprises the following steps: (1) dispersing 50 kg of talc powder in 80 L of 3% by mass dilute hydrochloric acid, stirring for 2 h, washing with water, and then calcining at 320° C. for 4 h to obtain pretreated talc powder; (2) Dispersing the modified carbon fiber in 100 L of deionized water, adding the pretreated talcum powder of step (1), stirring at a temperature of 75° C. for 2 h, then adding lignin glue, continuing to stir for 2 h, drying, and grinding to obtain modified talcum powder.

[0049] The mass ratio of talcum powder, modified carbon fiber and lignin glue is 1:0.6:0.08.

[0050] The preparation method of modified carbon fiber comprises the following steps: dispersing 60 kg of short carbon fibers with a length of 50-100 μm in 80 L of ammonia water, stirring for 25 min, washing with water, drying, calcining at 850° C. for 3 h under the protection of inert gas, dispersing in 100 L of deionized water, adding 7 kg of tetrahydrofuran, 10 kg of nano silver, 8 kg of nano titanium dioxide, and 3 kg of water-soluble chitosan, stirring at 75° C. for 2 h, drying, and grinding so that the length of the short carbon fibers decreases to less than 0.5 μm and the aspect ratio is less than 10, thereby obtaining modified carbon fibers; the water-soluble chitosan is carboxymethyl chitosan purchased from Lvshen Biology.

[0051] Preparation Example 2-2 The difference from Preparation Example 2-1 is that in step (2), no modified carbon fiber is added.

[0052] Preparation Example 2-3 The difference from Preparation Example 2-1 is that in step (2), no lignin glue is added.

[0053] Preparation Example 2-4 The difference from Preparation Example 2-1 is that the mass ratio of talcum powder, modified carbon fiber and lignin glue is 1:0.8:0.09.

[0054] Preparation Example 2-5 The difference from Preparation Example 2-1 is that the mass ratio of talcum powder, modified carbon fiber and lignin glue is 1:0.2:0.13.

[0055] Preparation Example 2-6 The difference from Preparation Example 2-1 is that nanosilver is not added in the preparation method of the modified carbon fiber.

[0056] Preparation Example 2-7 The difference from Preparation Example 2-1 is that in the preparation method of the modified carbon fiber, no nano titanium dioxide is added.

[0057] Preparation Example 2-8 The difference from Preparation Example 2-1 is that water-soluble chitosan is not added in the preparation method of the modified carbon fiber. Example

[0058] Example 1 A color plate for a car window frame comprises a stainless steel substrate, a passivation layer, an adhesive layer and a coating, wherein the coating comprises the following raw materials by weight: 90 kg of alkyd resin, 15 kg of silicon dioxide, 28 kg of modified polyester fiber, 8 kg of silane coupling agent KH-570, 20 kg of ethylene glycol, 15 kg of n-butanol, 10 kg of aluminum dihydrogen phosphate, 30 kg of modified talc, 16 kg of N,N-dimethylformamide, 12 kg of sodium methylene bisnaphthalene sulfonate and 110 kg of deionized water.

[0059] The raw materials of the passivation layer are prepared by mixing 12 kg of sulfuric acid, 3 kg of hydrochloric acid, 22 kg of chromium nitrate, 3 kg of cobalt chloride and 70 kg of deionized water and stirring them uniformly.

[0060] Raw materials for the adhesive layer: 10 kg of epoxy resin E-20, 3 kg of polyamide, and 60 kg of n-butanol were mixed and stirred evenly to obtain the raw materials for the adhesive layer.

[0061] The thickness of the passivation layer is 15 μm, the thickness of the adhesive layer is 9 μm, and the thickness of the coating is 22 μm.

[0062] The production process of the color plate for automobile window frame comprises the following steps: mixing alkyd resin, silicon dioxide, modified polyester fiber, silane coupling agent KH-570, ethylene glycol, n-butanol, aluminum dihydrogen phosphate, modified talcum powder, N,N-dimethylformamide, sodium methylenebisnaphthalene sulfonate and deionized water, stirring at a temperature of 80° C. for 30 minutes, and then melt-extruding, granulating and crushing to obtain a coating raw material; The passivation solution, adhesive solution and coating raw materials are sequentially coated on a stainless steel substrate to obtain a color plate for a car window frame.

[0063] Melt extrusion: the extruder barrel temperature was 130°C, the extruder screw temperature was 90°C, and the extruder speed was 100 rpm.

[0064] The coating method is spraying, the drying temperature after spraying is 160°C, and the drying time is 2 minutes.

[0065] The modified polyester fiber was prepared by Preparation Example 1-1, and the modified talc was prepared by Preparation Example 2-1.

[0066] Example 2 A color plate for a car window frame, which differs from Example 1 in that the coating comprises the following raw materials by weight: 80 kg alkyd resin, 20 kg silica, 25 kg modified polyester fiber, 12 kg silane coupling agent KH-570, 30 kg ethylene glycol, 12 kg n-butanol, 15 kg aluminum dihydrogen phosphate, 26 kg modified talc, 18 kg N,N-dimethylformamide, 8 kg sodium methylene bisnaphthalene sulfonate and 120 kg deionized water.

[0067] The thickness of the passivation layer is 20 μm, the thickness of the adhesive layer is 6 μm, and the thickness of the coating is 25 μm.

[0068] Example 3 A color plate for a car window frame, which is different from Example 1 in that the modified polyester fiber is prepared by Preparation Example 1-2.

[0069] Example 4 A color plate for automobile window frame, which is different from Example 1 in that the modified polyester fiber is prepared by Preparation Examples 1-3.

[0070] Example 5 A color plate for automobile window frame, which is different from Example 1 in that the modified polyester fiber is prepared by Preparation Examples 1-4.

[0071] Example 6 A color plate for automobile window frame, which is different from Example 1 in that the modified polyester fiber is prepared by Preparation Examples 1-5.

[0072] Example 7 A color plate for automobile window frame, which is different from Example 1 in that the modified polyester fiber is prepared by Preparation Examples 1-6.

[0073] Example 8 A color plate for automobile window frame, which is different from Example 1 in that the modified polyester fiber is prepared by Preparation Examples 1-7.

[0074] Example 9 A color plate for a car window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Example 2-2.

[0075] Example 10 A color plate for automobile window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Example 2-3.

[0076] Embodiment 11 A color plate for automobile window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Examples 2-4.

[0077] Example 12 A color plate for automobile window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Examples 2-5.

[0078] Embodiment 13 A color plate for automobile window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Examples 2-6.

[0079] Embodiment 14 A color plate for automobile window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Examples 2-7.

[0080] Embodiment 15 A color plate for automobile window frame, which is different from Example 1 in that the modified talcum powder is prepared by Preparation Examples 2-8.

[0081] Comparative Example Comparative Example 1 A color plate for a car window frame, which differs from Example 1 in that no modified polyester fiber is added.

[0082] Comparative Example 2 A color plate for a car window frame, which differs from Example 1 in that the modified polyester fiber is replaced by an equal amount of polyester fiber.

[0083] Comparative Example 3 A color plate for a car window frame, which differs from Example 1 in that no modified talcum powder is added.

[0084] Comparative Example 4 A color plate for a car window frame, which differs from Example 1 in that the modified talcum powder is replaced by an equal amount of talcum powder.

[0085] Performance testing The performance of the automobile window frame color plates prepared in Examples 1-15 and Comparative Examples 1-4 was tested: The impact resistance is tested in accordance with GB / T1732-2020 "Determination of impact resistance of paint films".

[0086] Test the scratch resistance according to ISO 12137-2-1997 "Determination of scratch resistance of paints and varnishes"; Test the salt spray resistance test and UV-B accelerated aging test according to GB / T12754 and GB / T13448; The test was conducted using a CS10 friction wheel with a load of 1 kg and a rotation speed of 1500 r. The wear amount was expressed by measuring the weight change of the film before and after friction. The test results are shown in Table 1.

[0087] Table 1 Test data of embodiments and comparative examples Combining the examples and the data in Table 1, it can be seen that the color plates for automobile window frames prepared in Examples 1-2 have good mechanical strength, scratch resistance and corrosion resistance, among which, the salt spray resistance of Example 1 is 16425h, UV-B ultraviolet accelerated aging is 17652, wear resistance is 20mg, impact resistance is, 90.2cm, and scratch resistance is 5.1kgf. It shows that the coating prepared in this application can resist corrosion factors in the environment, extend the service life of the stainless steel substrate, provide good mechanical properties, wear resistance, anti-fouling and other functions, and with the long-term use of the color coated steel plate, the surface will not be worn and scratched due to wind and sun exposure, and the durability of the color coated steel plate will be extended.

[0088] In the preparation method of the modified polyester fiber of Examples 3-4, modified graphene and dextrin glue solution are not added respectively. In Examples 5-6, the mass ratio of polyester fiber, modified graphene and dextrin glue solution is changed. As can be seen from Table 1, the performance test results of Examples 3-4 on salt spray resistance, UV-B accelerated aging, wear resistance, impact resistance and scratch resistance are worse than those of Examples 1-2 and 5, and the corresponding test results of Example 6 are better than those of Examples 3-4, but worse than those of Examples 1-2 and 5, indicating that the modified graphene can be loaded on the surface of the polyester fiber to improve the flexibility, impact resistance and wear resistance of the polyester fiber. The dextrin glue solution has strong adhesion and film-forming properties, so that the modified graphene adheres to the surface of the polyester fiber, increases the adhesion and stability of the polyester fiber, and is subsequently applied to the coating to increase the mechanical properties, stability and wear resistance of the coating, and extend the service life of the coating and the color plate of the automobile window frame.

[0089] In the preparation method of modified graphene of Example 7-8, nano nickel and hydroxyethyl cellulose are not added respectively. As can be seen from Table 1, the performance test results of salt spray resistance, UV-B ultraviolet accelerated aging, wear resistance, impact resistance and scratch resistance of Example 7-8 are better than those of Example 3, but worse than those of Example 1-2, indicating that nano nickel has good strength and hardness, can be loaded on the surface of graphene, increase the specific surface area of ​​graphene, and hydroxyethyl cellulose has good thickening and stability, so that nano nickel is uniformly adhered to the surface of graphene, and the mechanical strength and wear resistance of modified graphene are improved. Subsequent application in coating improves the corresponding performance of coating, which helps to improve the construction performance and coating quality of coating and automobile window frame color plate in the future.

[0090] In the preparation method of modified talcum powder of embodiment 9-10, modified carbon fiber and lignin glue are not added respectively, and the mass ratio of talcum powder, modified carbon fiber and lignin glue is changed in embodiment 11-12. As can be seen from Table 1, the performance test results of salt spray resistance, UV-B ultraviolet accelerated aging, wear resistance, impact resistance and scratch resistance of embodiment 9-10 are worse than those of embodiment 1-2 and embodiment 11, and the corresponding test results of embodiment 12 are better than those of embodiment 9-10, but worse than those of embodiment 1-2 and embodiment 11, indicating that lignin glue has good bonding properties, so that modified carbon fiber adheres to the surface of talcum powder, and improves the mechanical strength, adhesion and corrosion resistance of modified talcum powder. Subsequent application in coating can enhance the toughness, wear resistance and corrosion resistance of coating, improve the bonding strength between coating and stainless steel surface, prevent coating from falling off, and make coating more durable.

[0091] In the preparation method of the modified carbon fiber of embodiment 13-15, nano silver, nano titanium dioxide, and water-soluble chitosan are not added respectively. As can be seen from Table 1, the performance test results of salt spray resistance, UV-B ultraviolet accelerated aging, wear resistance, impact resistance, and scratch resistance of embodiment 13-15 are better than those of embodiment 9, but worse than those of embodiment 1-2, indicating that nano silver has excellent antibacterial properties, can be loaded on the surface of carbon fiber, improves the antibacterial property of carbon fiber, and the anti-ultraviolet performance, weather resistance, and chemical stability of nano titanium dioxide improve the corresponding properties of coating. Water-soluble chitosan has good biocompatibility and adhesion, improves the bonding force between carbon fiber and nano silver and nano titanium dioxide, and various components are mixed and subsequently applied to coating to increase the mechanical strength, corrosion resistance, antibacterial property, electrical conductivity, weather resistance, and biocompatibility of coating, ensuring that coating can be firmly attached to substrate.

[0092] Comparative Example 1 does not add modified polyester fiber, and Comparative Example 3 does not add modified talcum powder. As shown in Table 1, the performance test results of comparative example 1 in terms of salt spray resistance, UV-B accelerated aging, wear resistance, impact resistance, and scratch resistance are worse than those of examples 1-2. This indicates that the modified polyester fiber has good flexibility, enhances the tensile strength and heat resistance of the coating, and improves the crack resistance of the coating. The modified talcum powder can fill the pores of the coating, improve the processing performance of the coating, and increase the hardness and wear resistance of the coating.

[0093] Comparative Example 2 and Comparative Example 4 respectively use the modified polyester fiber replaced by the same amount of polyester fiber and the modified talcum powder replaced by the same amount of talcum powder. As can be seen from Table 1, the performance test results of the salt spray resistance, UV-B accelerated aging, abrasion resistance, impact resistance and scratch resistance of Comparative Example 2 and Comparative Example 4 are worse than those of Examples 1-2, but better than those of Comparative Example 1 and Comparative Example 3. It shows that the modified polyester fiber and talcum powder of the present application have good mechanical properties and adhesion, and extend the service life of the color plate of the automobile window frame.

[0094] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A color plate for automobile window frame, characterized in that: The invention comprises a stainless steel substrate, a passivation layer, an adhesive layer and a coating. The coating comprises the following raw materials by weight: 80-90 parts of alkyd resin, 15-20 parts of silicon dioxide, 25-28 parts of modified polyester fiber, 8-12 parts of silane coupling agent KH-570, 20-30 parts of ethylene glycol, 12-15 parts of n-butanol, 10-15 parts of aluminum dihydrogen phosphate, 26-30 parts of modified talc, 16-18 parts of N,N-dimethylformamide, 8-12 parts of sodium methylenebisnaphthalene sulfonate and 110-120 parts of deionized water.

2. The color plate for automobile window frame according to claim 1, characterized in that: The preparation method of the modified polyester fiber comprises the following steps: (1) PET, pearl powder and sodium carboxymethyl cellulose are mixed evenly, dried at 140-145°C for 20-24 hours, extruded, pelletized and spun to obtain polyester fibers; (2) dispersing the polyester fiber in a sodium hydroxide solution, soaking for 1-2 hours, washing with water, and then dispersing it in deionized water, adding the modified graphene, ultrasonicating for 2-3 hours, filtering, and drying to obtain a mixture; (3) Spraying the mixture of step (2) with an aqueous solution of dextrin glue, and drying the mixture to obtain modified polyester fibers.

3. The color plate for automobile window frame according to claim 2, characterized in that: The mass ratio of the polyester fiber, the modified graphene and the dextrin glue solution is 1g:50-60mg:0.1-0.2g.

4. The color plate for automobile window frame according to claim 2, characterized in that: The preparation method of the modified graphene comprises the following steps: dispersing the graphene in a sodium hydroxide solution, stirring for 1-2 hours, washing with water, dispersing the graphene in a hydrochloric acid solution, stirring for 2-3 hours, washing with water, and then dispersing the graphene in deionized water, adding nano nickel, hydroxyethyl cellulose and sodium polystyrene sulfonate, stirring for 2-3 hours at a temperature of 60-65° C., and drying to obtain the modified graphene.

5. The color plate for automobile window frame according to claim 1, characterized in that: The preparation method of the modified talcum powder comprises the following steps: (1) dispersing talc in dilute hydrochloric acid, stirring for 1-2 hours, washing with water, and then calcining at a temperature of 300-320°C for 3-4 hours to obtain pretreated talc; (2) Dispersing the modified carbon fiber in deionized water, adding the pretreated talcum powder of step (1), stirring at a temperature of 70-75° C. for 1-2 hours, then adding lignin glue, continuing to stir, drying, and grinding to obtain modified talcum powder.

6. The color plate for automobile window frame according to claim 5, characterized in that: The mass ratio of the talcum powder, the modified carbon fiber and the lignin glue is 1:0.6-0.8:0.08-0.

09.

7. The color plate for automobile window frame according to claim 5, characterized in that: The preparation method of the modified carbon fiber comprises the following steps: dispersing short carbon fibers with a length of 50-100 μm in ammonia water, stirring for 20-25 minutes, washing with water, drying, calcining at a temperature of 800-850°C for 2-3 hours under the protection of inert gas, dispersing in deionized water, adding tetrahydrofuran, nano silver, nano titanium dioxide, and water-soluble chitosan, stirring at a temperature of 70-75°C for 1-2 hours, drying, and grinding so that the length of the short carbon fibers decreases to less than 0.5 μm and the aspect ratio is less than 10, thereby obtaining the modified carbon fibers.

8. The color plate for automobile window frame according to claim 1, characterized in that: The thickness of the passivation layer is 15-20 μm, the thickness of the adhesive layer is 6-9 μm, and the thickness of the coating is 22-25 μm.

9. The production process of a color plate for automobile window frame according to claim 1, characterized in that: The method comprises the following steps: mixing alkyd resin, silicon dioxide, modified polyester fiber, silane coupling agent KH-570, ethylene glycol, n-butanol, aluminum dihydrogen phosphate, modified talcum powder, N,N-dimethylformamide, sodium methylene bisnaphthalene sulfonate and deionized water, stirring at a temperature of 75-80° C. for 25-30 minutes, and then melt-extruding, granulating and crushing to obtain a coating raw material; The passivation solution, adhesive solution and coating raw materials are sequentially coated on a stainless steel substrate to obtain a color plate for a car window frame.

10. The production process of a color plate for automobile window frame according to claim 9, characterized in that: The coating method is spraying, the drying temperature after spraying is 150-160° C., and the drying time is 1-2 minutes.

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