Automobile coating agent and preparation method thereof

Abstract

The invention relates to the technical field of coating agents, in particular to an automobile coating agent which comprises the following components in parts by weight: 12-36 parts of water-based fluorocarbon resin emulsion; 3-6 parts of an inorganic filler; 4-9 parts of water-soluble silicone oil; 3-10 parts of an emulsifier; and 70 to 100 parts of deionized water. According to the automobile coating agent provided by the invention, the organic fluorocarbon resin is used as substrate resin, so that excellent hydrophobicity can be provided for a substrate, adhesion of stubborn stains such as bird droppings, shell-lac, oil stains and the like is effectively prevented, excellent self-cleaning capability is given to a coating, adhesion of pollutants on a paint surface layer is reduced, and the stain resistance is improved; and further, the damage to automobile paint and varnish coatings is reduced.

Description

Technical Field

[0001] This invention relates to the field of coating agent technology, and in particular to an automotive coating agent and its preparation method. Background Technology

[0002] Automotive paint and clear coat coatings are not only an important part of a vehicle's appearance, but also the first line of defense against environmental erosion. However, with the development of modern industry and the intensification of human activities, the external environment faced by automotive coatings is becoming increasingly harsh. Multiple factors work together to pose a serious threat to the integrity and decorative properties of the coating.

[0003] First, harmful components in the atmosphere are the main cause of coating aging and damage. Sulfur oxides and nitrogen oxides produced by industrial emissions and vehicle exhaust dissolve in water to form acid rain, which reacts with the chemical components in the coating, leading to corrosion, loss of gloss, discoloration, and even spotting of the clear coat. Simultaneously, metal particles, industrial dust, and fine sand carried by sandstorms in the atmosphere, under the influence of wind and rain, act like abrasives, repeatedly scraping the coating surface and creating fine scratches, damaging its gloss. Furthermore, extreme heat caused by global warming accelerates the volatilization and degradation of resins and additives in the coating, making them brittle and cracking, thus reducing the overall durability and protective performance of the coating. Besides natural and anthropogenic environmental factors, bird droppings, insect droppings, wood tar, residual tar, dirt, ice, and ultraviolet radiation also damage automotive paint and clear coat coatings.

[0004] Therefore, how to protect automotive paint and clear coat is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] To address the problem of easy damage to automotive paint and clear coat coatings in existing technologies, this invention provides an automotive coating agent. This coating agent uses organic fluorocarbon resin as the base resin, which provides excellent hydrophobicity to the base, thereby weakening the interfacial bonding force between contaminants and the coating surface, shortening the contact time, and significantly improving the overall stain resistance and long-term protection capability, thus solving the problem of easy damage to automotive paint and clear coat coatings in existing technologies.

[0006] The technical solution adopted by this invention to solve its technical problem is: An automotive coating agent, by weight fraction, comprises the following components: 12-36 parts of waterborne fluorocarbon resin emulsion; 3-6 parts of inorganic filler; 4-9 parts of water-soluble silicone oil; 3-10 parts emulsifier; 70-100 parts deionized water.

[0007] Optionally, the solid content of the aqueous fluorocarbon resin emulsion is 48%.

[0008] Optionally, the inorganic filler is a TiO2-SiO2-ZrO2 nanocomposite material.

[0009] Optionally, the ZrO2 mass content in the TiO2-SiO2-ZrO2 nanocomposite material is 0.1%-3%.

[0010] Optionally, the TiO2 content in the TiO2-SiO2-ZrO2 nanocomposite material is 7%-10% by mass.

[0011] Optionally, the TiO2-SiO2-ZrO2 nanocomposite material is prepared using tetraethoxysilane, tetraisopropyl titanate and tetrabutyl zirconate as precursors and an ammonia solution as a precipitator.

[0012] Optionally, the water-soluble silicone oil is a polyether-modified polydimethylsiloxane.

[0013] Optionally, the emulsifier is selected from at least one of Tween, Spen 60, sorbitan fatty acid ester, and sodium dodecyl sulfate.

[0014] Optionally, the Tween is Tween 50.

[0015] Another object of the present invention is to provide a method for preparing the automotive coating agent as described above, comprising the following steps: stirring an aqueous fluorocarbon resin emulsion, an inorganic filler, a water-soluble silicone oil, an emulsifier, and deionized water at 40-50°C according to the formula amount to obtain the automotive coating agent.

[0016] The beneficial effects of this invention are: The automotive coating agent provided by this invention uses organic fluorocarbon resin as the base resin, which can provide excellent hydrophobicity to the base, effectively prevent the adhesion of stubborn stains such as bird droppings, insect glue, and oil stains, and give the coating excellent self-cleaning ability, reduce the adhesion of pollutants on the paint surface, improve stain resistance, and thus reduce damage to automotive paint and clear coat coatings. Detailed Implementation

[0017] The present invention will now be described in further detail. The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Currently, the main methods for protecting automotive paint and clear coat coatings are using vinyl or polyurethane films. Vinyl films are cheaper than polyurethane films, but they are harder and less prone to deformation, making them susceptible to peeling, cracking, and bursting over time. Polyurethane films are thicker, and due to their structural characteristics, they can tighten small scratches and abrasions when the car body is heated, but they are more expensive.

[0019] To address the problem of easy damage to automotive paint and clear coat coatings in existing technologies, this invention provides an automotive coating agent, which, by weight fraction, comprises the following components: 12-36 parts of waterborne fluorocarbon resin emulsion; 3-6 parts of inorganic filler; 4-9 parts of water-soluble silicone oil; 3-10 parts emulsifier; 70-100 parts deionized water.

[0020] This coating agent incorporates a water-based fluorocarbon resin emulsion. On one hand, because the emulsion uses water as the dispersion medium, it is more environmentally friendly compared to solvent-based products. On the other hand, the carbon-fluorine bond energy in fluorocarbon resin is extremely low, which can endow the coating with extremely low surface tension, thus giving the coating strong hydrophobic and oleophobic properties. It can also effectively prevent the adhesion of stubborn stains such as bird droppings, insect glue, and oil stains. Furthermore, it can give the coating excellent self-cleaning ability, so that it can use the physical force of rainwater to wash away most of the surface dust and dirt, reduce the adhesion of pollutants to the paint surface, improve stain resistance, and thus reduce damage to automotive paint and clear coat coatings.

[0021] The automotive coating agent provided by this invention uses organic fluorocarbon resin as the base resin, which can provide excellent hydrophobicity to the base, effectively prevent the adhesion of stubborn stains such as bird droppings, insect glue, and oil stains, and give the coating excellent self-cleaning ability, reduce the adhesion of pollutants on the paint surface, improve stain resistance, and thus reduce damage to automotive paint and clear coat coatings.

[0022] Furthermore, the present invention preferably has a solid content of 48% for the waterborne fluorocarbon resin emulsion, in order to avoid excessive viscosity due to excessive solid content and to avoid low effective ingredient content due to excessively low solid content.

[0023] Specifically, the preferred aqueous fluorocarbon resin emulsion of this invention is PB98873 Wengjiang reagent.

[0024] Furthermore, the present invention preferably uses TiO2-SiO2-ZrO2 nanocomposite material as inorganic filler. Through the synergistic effect of aqueous fluorocarbon resin emulsion and TiO2-SiO2-ZrO2, the anti-ultraviolet performance, scratch resistance and wear resistance of the coating solution are improved.

[0025] Furthermore, the present invention preferably contains 0.1%-3% ZrO2 in the TiO2-SiO2-ZrO2 nanocomposite material, more preferably 1%; preferably 7%-10% TiO2 in the TiO2-SiO2-ZrO2 nanocomposite material, more preferably 10%.

[0026] The present invention preferably uses tetraethoxysilane, tetraisopropyl titanate and tetrabutyl zirconate as precursors and ammonia solution as precipitator to prepare TiO2-SiO2-ZrO2 nanocomposite material.

[0027] Specifically, the preferred TiO2-SiO2-ZrO2 nanocomposite material is prepared according to the following method: S1: Dissolve tetraethoxysilane and tetraisopropyl titanate in ethanol according to the formula to obtain solution A; Preferably, the volume ratio of tetraethoxysilane, tetraisopropyl titanate, and ethanol in this step is 1:10:89; S2: Dissolve tetrabutyl zirconate in distilled water to obtain solution B; Preferably, the volume ratio of tetrabutyl zirconate to distilled water in this step is 2:3; S3: Mix solution A and solution B with ammonia solution to obtain SiO2-TiO2-ZrO2 sol; The preferred mass concentration of the ammonia solution is 12.5%, and the volume ratio of solution A, solution B and ammonia solution is more preferably 1:2:0.5; preferably, solution A, solution B and ammonia solution are mixed at 500 rpm for 24 hours to obtain SiO2-TiO2-ZrO2 sol; S4: After concentrating and washing the SiO2-TiO2-ZrO2 sol by centrifugation, it was calcined at 500℃ to obtain the TiO2-SiO2-ZrO2 nanocomposite material; Preferably, the sample obtained in this step is concentrated and washed by centrifugation at 3000 rpm for 10 minutes (this process is repeated 5 times), and preferably the sample is calcined at 500°C for 12 hours.

[0028] The preferred water-soluble silicone oil of this invention is polyether-modified polydimethylsiloxane, and more preferably, the polyether-modified polydimethylsiloxane is HC5833 from Guangdong Haohui New Materials Co., Ltd.

[0029] The emulsifier of the present invention is preferably selected from at least one of Tween, Spand 60, sorbitan fatty acid ester, and sodium dodecyl sulfonate, and is further preferably Tween 50.

[0030] Another object of the present invention is to provide a method for preparing the automotive coating agent as described above. The preparation method includes the following steps: according to the formula amount, water-based fluorocarbon resin emulsion, inorganic filler, water-soluble silicone oil, emulsifier, and deionized water are stirred at 40~50°C, preferably for 5 hours to mix thoroughly, to obtain the automotive coating agent.

[0031] The method for preparing the automotive coating agent provided by this invention is simple. The prepared automotive coating agent uses organic fluorocarbon resin as the base resin, which can provide the base with excellent hydrophobicity, effectively prevent the adhesion of stubborn stains such as bird droppings, insect glue, and oil stains, and endow the coating with excellent self-cleaning ability, reduce the adhesion of pollutants on the paint surface, improve the stain resistance, and thus reduce the damage to automotive paint and clear coat coatings.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below.

[0033] Unless otherwise specified, the aqueous fluorocarbon resin emulsions in all examples and comparative examples are PB98873 Wengjiang reagent with a solid content of 48%; the polyether-modified polydimethylsiloxanes are HC5833 Guangdong Haohui New Material Co., Ltd.

[0034] The TiO2-SiO2-ZrO2 nanocomposites were all prepared according to the following methods: S1: According to the formula, dissolve tetraethoxysilane and tetraisopropyl titanate in ethanol to obtain solution A; wherein the volume ratio of tetraethoxysilane, tetraisopropyl titanate and ethanol is 1:10:89. S2: Dissolve tetrabutyl zirconate in distilled water to obtain solution B; wherein the volume ratio of tetrabutyl zirconate to distilled water is 2:3; S3: Mix solutions A and B with ammonia solution at 500 rpm for 24 hours to obtain SiO2-TiO2-ZrO2 sol; wherein the mass concentration of ammonia solution is 12.5%, and the volume ratio of solutions A, B and ammonia solution is 1:2:0.5; S4: After concentrating and washing the SiO2-TiO2-ZrO2 sol by centrifugation at 3000 rpm for 10 minutes (this process was repeated 5 times), the sol was calcined at 500℃ for 12 h to obtain the TiO2-SiO2-ZrO2 nanocomposite material; the mass content of ZrO2 in the TiO2-SiO2-ZrO2 nanocomposite material was 1% and the mass content of TiO2 was 10%.

[0035] The preparation methods for each embodiment and comparative example are as follows: according to the formula amount, each component is stirred at 45°C for 5 hours to mix thoroughly, thereby obtaining the automotive coating agent. Example 1

[0036] This embodiment provides an automotive coating agent, which, by weight, comprises the following components: 24 parts of waterborne fluorocarbon resin emulsion; Five portions of TiO2-SiO2-ZrO2 nanocomposite material; 6 parts of polyether-modified polydimethylsiloxane; Tween 50 6 portions; 85 parts of deionized water. Example 2

[0037] This embodiment provides an automotive coating agent, which, by weight, comprises the following components: 12 parts of waterborne fluorocarbon resin emulsion; Six portions of TiO2-SiO2-ZrO2 nanocomposite material; Nine parts of polyether-modified polydimethylsiloxane; 3 parts of dehydrated sorbitan fatty acid ester; 70 parts of deionized water. Example 3

[0038] This embodiment provides an automotive coating agent, which, by weight, comprises the following components: 36 parts of waterborne fluorocarbon resin emulsion; Three portions of TiO2-SiO2-ZrO2 nanocomposite material; 4 parts of polyether-modified polydimethylsiloxane; Spahn 60 10 copies; 100 portions of deionized water.

[0039] Each comparative example in this invention is compared with Example 1.

[0040] Comparative Example 1 This comparative example provides an automotive coating agent, which, by weight, comprises the following components: 24 parts of acrylic resin emulsion; Five portions of TiO2-SiO2-ZrO2 nanocomposite material; 6 parts of polyether-modified polydimethylsiloxane; Tween 50 6 portions; 85 parts of deionized water.

[0041] The acrylic resin emulsion is WB80279 from Guangdong Haohui New Materials Co., Ltd., with a solid content of 40%.

[0042] Comparative Example 2 This comparative example provides an automotive coating agent, which, by weight, comprises the following components: 24 parts of waterborne fluorocarbon resin emulsion; 5 parts of nano-titanium dioxide; 6 parts of polyether-modified polydimethylsiloxane; Tween 50 6 portions; 85 parts of deionized water.

[0043] The automotive coating agents prepared in each embodiment and comparative example were applied to tinplate containing automotive paint using a spray gun and a soft cloth. After heating and drying, they were tested using the following methods: Hydrophobicity test: The contact angle was measured using a Kono SL200KS optical contact angle meter (USA). UV resistance test: The tinplate coated with the coating solution was subjected to UV aging test for 720 hours in an accelerated UV aging tester. The appearance and adhesion of the coating were observed. The adhesion was tested in accordance with the standard GB / T 9286-1998.

[0044] The test results are shown in the table below: As can be seen from the data in the table above, the contact angle of the coating agent prepared by this invention can reach 110°, and the adhesion test level is 1 before and after UV aging, indicating that when applied to the surface of automotive paint, it has excellent UV protection and anti-fouling properties.

[0045] The difference between Comparative Example 1 and Example 1 is that an equal amount of acrylic resin was used instead of the aqueous fluorocarbon resin emulsion. It can be seen that the contact angle and the adhesion before and after UV aging decreased significantly.

[0046] The difference between Comparative Example 2 and Example 1 is that an equal amount of nano-titanium dioxide is used instead of TiO2-SiO2-ZrO2 nanocomposite material. It can be seen that the contact angle and the adhesion before and after UV aging are slightly reduced.

[0047] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An automotive coating agent, characterized in that, Based on weight fraction, it includes the following components: 12-36 parts of waterborne fluorocarbon resin emulsion; 3-6 parts of inorganic filler; 4-9 parts of water-soluble silicone oil; 3-10 parts emulsifier; 70-100 parts deionized water.

2. The automotive coating agent as described in claim 1, characterized in that, The solid content of the aqueous fluorocarbon resin emulsion is 48%.

3. The automotive coating agent as described in claim 1, characterized in that, The inorganic filler is a TiO2-SiO2-ZrO2 nanocomposite material.

4. The automotive coating agent as described in claim 3, characterized in that, The ZrO2 content in the TiO2-SiO2-ZrO2 nanocomposite material is 0.1%-3% by mass.

5. The automotive coating agent as described in claim 3, characterized in that, The TiO2 content in the TiO2-SiO2-ZrO2 nanocomposite material is 7%-10% by mass.

6. The automotive coating agent as described in claim 3, characterized in that, The TiO2-SiO2-ZrO2 nanocomposite material was prepared using tetraethoxysilane, tetraisopropyl titanate and tetrabutyl zirconate as precursors and ammonia solution as a precipitator.

7. The automotive coating agent according to any one of claims 1-6, characterized in that, The water-soluble silicone oil is polyether-modified polydimethylsiloxane.

8. The automotive coating agent according to any one of claims 1-6, characterized in that, The emulsifier is selected from at least one of Tween, Spen 60, sorbitan fatty acid ester, and sodium dodecyl sulfate.

9. The automotive coating agent as described in claim 8, characterized in that, The Tween mentioned is Tween 50.

10. A method for preparing an automotive coating agent as described in any one of claims 1-9, characterized in that, The process includes the following steps: according to the formula, water-based fluorocarbon resin emulsion, inorganic filler, water-soluble silicone oil, emulsifier, and deionized water are stirred at 40~50℃ to obtain an automotive coating agent.

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