Water-based bright black hub environment-friendly coating and preparation method thereof

Abstract

The invention relates to the technical field of hub coatings, in particular to a water-based bright black hub environment-friendly coating and a preparation method thereof. The invention provides a water-based bright black hub environment-friendly coating on the first aspect. Preparation raw materials comprise 20-30% of water-based polyester modified acrylic resin, 10-20% of water-based acrylic modified polyester resin, 0.8-2% of a dispersant, 2-6% of a solvent, 2-8% of amino resin, 1-3.5% of carbon black, 2-10% of a filler, 0.2-2% of an antifoaming agent, 0.2-2% of a wetting leveling agent and the balance of water. The water-based bright black hub environment-friendly coating provided by the invention has the advantages of high gloss, high fullness, high blackness, good matching performance with prime coat powder, finishing powder and finishing oil, and strong construction adaptability, and meets the requirements of subsequent machining.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub coatings, and in particular to a water-based bright black wheel hub environmentally friendly coating and a preparation method thereof. Background Art

[0002] As the world pays more and more attention to environmental protection, the automotive industry, as one of the important sources of atmospheric pollutant emissions, faces increasingly stringent environmental protection requirements. Automobile wheels are currently mainly equipped with powder primers, water-based low-gloss paints, oil-based paints, and topcoat varnishes or topcoat powders. With the improvement of environmental protection requirements, the popularity of water-based paints in the automotive industry has also increased significantly. However, the current water-based paints for automobile wheels have problems such as low adhesion or poor processability.

[0003] Patent CN110804354B discloses an anti-scratch composition, which achieves high abrasion resistance and low gloss loss of anti-scratch matte varnish for automobile wheels; CN107459900A discloses a coating composition that can be used for motorcycles, ensuring excellent adhesion and salt spray resistance of aluminum alloy wheels, but there are relatively few reports on water-based coatings used for automobile wheels.

[0004] Therefore, providing an environmentally friendly water-based glossy black wheel hub coating that is recoatable and has good adhesion is the main technical problem that needs to be solved at present. Summary of the invention

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a water-based glossy black wheel hub environmentally friendly coating. Its preparation raw materials include, by mass percentage, 20-30% water-based polyester modified acrylic resin, 10-20% water-based acrylic modified polyester resin, 0.8-2% dispersant, 2-6% solvent, 2-8% amino resin, 1-3.5% carbon black, 2-10% filler, 0.2-2% defoamer, 0.2-2% wetting and leveling agent, and water as the balance.

[0006] Through modification, the water-based polyester resin can significantly improve the water resistance, chemical resistance and mechanical properties of the acrylic resin, while the water-based acrylic modified polyester resin can significantly improve the viscosity and consistency of the product. In one embodiment, the mass ratio of the water-based polyester modified acrylic resin to the water-based acrylic modified polyester resin is 1:(0.4-0.8).

[0007] In one embodiment, the mass ratio of the water-based polyester-modified acrylic resin to the water-based acrylic-modified polyester resin is 1:(0.5-0.6).

[0008] In one embodiment, the waterborne polyester modified acrylic resin contains a hydroxyl value of 95-105 mg KOH / g, and the dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. is 4000-18000 cps; in one embodiment, the waterborne polyester modified acrylic resin can be purchased from Guangdong Qirun New Materials Co., Ltd., model PKA605.

[0009] In one embodiment, the water-based acrylic modified polyester resin can be purchased from Allnex USA. 6306SS-60.

[0010] In one embodiment, the dispersant comprises an acrylic block copolymer.

[0011] In one embodiment, the dispersant comprising an acrylic block copolymer can be purchased from BASF Ultra PX-4565.

[0012] In one embodiment, the solvent is ethylene glycol butyl ether.

[0013] In one embodiment, the amino resin is selected from the following types: 303LF, 327.

[0014] In one embodiment, the amino resin includes a type 303LF and model 327 amino resin, the model is 327 amino resin and model The mass ratio of amino resin of 303LF is 1:(1.2-2).

[0015] In one embodiment, the model is 327 amino resin and model The mass ratio of amino resin of 303LF is 1:1.5.

[0016] In one embodiment, the wetting and leveling agent includes Digo 4100 and / or BYK381; if the wetting and leveling agent includes Digo 4100 and BYK381, the mass ratio of the wetting and leveling agent of Digo 4100 to the wetting and leveling agent of BYK381 is (0.3-0.7): 1

[0017] In one embodiment, the filler includes talc and / or silica powder; if the filler includes talc and silica powder, the mass ratio of the talc to the silica powder is 1:(0.9-1.1).

[0018] In one embodiment, the particle size of the talc is 2000-3000 mesh.

[0019] In one embodiment, the particle size of the talc is 2500 mesh.

[0020] In one embodiment, the particle size of the silicon powder is 1000-1500 mesh.

[0021] In one embodiment, the particle size of the silicon powder is 1250 mesh.

[0022] The inventors found in the experimental process that by using water-based polyester modified acrylic resin, water-based acrylic modified polyester resin and amino resin for coordination, the mass ratio of the water-based polyester modified acrylic resin to the water-based acrylic modified polyester resin is 1: (0.4-0.8), especially the mass ratio of the water-based polyester modified acrylic resin to the water-based acrylic modified polyester resin is 1: (0.5-0.6), especially the water-based polyester modified acrylic resin contains a hydroxyl value of 95-105 mgKOH / g, the dynamic viscosity of the water-based polyester modified acrylic resin at 30°C is 4000-18000 cps, and the model of the water-based acrylic modified polyester resin is Allnex 6306SS-60, amino resin adopts model 303LF and model 327 amino resin, the model is 327 amino resin and model The mass ratio of 303LF amino resin is 1: (1.2-2), so that the prepared water-based glossy black wheel hub environmentally friendly coating has good recoatability and can be recoated 3 times. The adhesion is maintained above level 1, and the water-based glossy black wheel hub environmentally friendly coating has high covering sandpaper texture and can meet the requirements of 600-mesh sandpaper. It has the characteristics of high gloss and fullness, high blackness, good matching with primer powder, glazing powder and glazing oil, strong construction adaptability, and meets the requirements of subsequent machining. After the matching coating is machined, the paint film is intact without edge collapse or shedding.

[0023] A second aspect of the present invention provides a method for preparing a water-based glossy black wheel hub environmentally friendly coating, comprising the following steps:

[0024] After mixing water-based polyester modified acrylic resin, water-based acrylic modified polyester resin, amino resin and solvent, dispersant, defoamer, wetting and leveling agent and filler are added in sequence and mixed evenly, and then carbon black is added and mixed evenly to obtain water-based bright black wheel hub environmentally friendly coating.

[0025] Beneficial effects:

[0026] 1. The present application provides a water-based black wheel hub environmentally friendly coating, which has the characteristics of high gloss and high fullness, high blackness, good compatibility with primer powder, topcoat powder and topcoat oil, strong construction adaptability, and meets the requirements of subsequent machining.

[0027] 2. When optimizing the coating formulation system, the coating provided in this application has high gloss, specifically, the gloss at a 60-degree angle can reach 90, and the gloss at a 20-degree angle can reach more than 85.

[0028] 3. The coating provided in this application has a high hiding power against sandpaper grains and can provide a good hiding effect under the condition of 600-grit sandpaper.

[0029] 4 The coating provided in this application is well matched with the powder coating and meets the requirements of on-site over-baking; it has good recoatability and can be recoated three times, and the adhesion is maintained above level 1.

[0030] 5 The coating provided in this application can meet the requirements of subsequent machining, and the paint film is intact after machining of the matching coating, without edge collapse or falling off. DETAILED DESCRIPTION

[0031] Example 1

[0032] The first aspect of the present embodiment provides a water-based glossy black wheel hub environmentally friendly coating, and its preparation raw materials include, by mass percentage, 25% water-based polyester modified acrylic resin, 14% water-based acrylic modified polyester resin, 1% dispersant, 3% solvent, 5% amino resin, 2.5% carbon black, 10% filler, 0.2% defoaming agent, 0.5% wetting and leveling agent, and the remainder water.

[0033] The water is deionized water.

[0034] The waterborne polyester modified acrylic resin has a hydroxyl value of 95-105 mg KOH / g, and a dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. of 4000-18000 cps.

[0035] The water-based polyester modified acrylic resin was purchased from Guangdong Qirun New Materials Co., Ltd., model number PKA605.

[0036] The water-based acrylic modified polyester resin was purchased from Allnex USA 6306SS-60.

[0037] The dispersant was purchased from BASF Ultra PX-4565.

[0038] The solvent is ethylene glycol butyl ether, Dow BCS from the United States.

[0039] The amino resin is of the type 303LF and model 327 amino resin composition, the model is 327 amino resin and model The mass ratio of amino resin of 303LF is 1:1.5.

[0040] The wetting and leveling agent was purchased from Germany's Digo 4100.

[0041] The defoamer was purchased from Germany's Digo 104E.

[0042] The filler is talc.

[0043] The particle size of the talcum powder is 2500 mesh, and the manufacturer purchased is Guangfu Building Materials (Jiaoling) Refining Co., Ltd.

[0044] A second aspect of the present embodiment provides a method for preparing a water-based glossy black wheel hub environmentally friendly coating, comprising the following steps:

[0045] After mixing water-based polyester modified acrylic resin, water-based acrylic modified polyester resin, amino resin and solvent, dispersant, defoamer, wetting and leveling agent and filler are added in sequence and mixed evenly, and then carbon black is added and mixed evenly to obtain water-based bright black wheel hub environmentally friendly coating.

[0046] Example 2

[0047] The first aspect of the present embodiment provides a water-based glossy black wheel hub environmentally friendly coating, and its preparation raw materials include, by mass percentage, 25% water-based polyester modified acrylic resin, 14% water-based acrylic modified polyester resin, 1% dispersant, 3% solvent, 5% amino resin, 2.5% carbon black, 10% filler, 0.2% defoaming agent, 0.5% wetting and leveling agent, and the remainder water.

[0048] The water is deionized water.

[0049] The waterborne polyester modified acrylic resin has a hydroxyl value of 95-105 mg KOH / g, and a dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. of 4000-18000 cps.

[0050] The water-based polyester modified acrylic resin was purchased from Guangdong Qirun New Materials Co., Ltd., model number PKA605.

[0051] The water-based acrylic modified polyester resin was purchased from Allnex USA 6306SS-60.

[0052] The dispersant was purchased from BASF Ultra PX-4565.

[0053] The solvent is ethylene glycol butyl ether, Dow BCS from the United States.

[0054] The amino resin is of the type 303LF and model 327 amino resin composition, the model is 327 amino resin and model The mass ratio of amino resin of 303LF is 1:1.5.

[0055] The wetting and leveling agent is purchased from German manufacturer's model number Tego 4100 and German manufacturer's model number BYK381; and the mass ratio of the wetting and leveling agent of Tego 4100 to the wetting and leveling agent of BYK381 is 0.5:1.

[0056] The defoamer was purchased from Germany's Digo 104E.

[0057] The filler is talc.

[0058] The particle size of the talcum powder is 2500 mesh, and the manufacturer purchased is Guangfu Building Materials (Jiaoling) Refining Co., Ltd.

[0059] A second aspect of the present embodiment provides a method for preparing a water-based glossy black wheel hub environmentally friendly coating, comprising the following steps:

[0060] After mixing water-based polyester modified acrylic resin, water-based acrylic modified polyester resin, amino resin and solvent, dispersant, defoamer, wetting and leveling agent and filler are added in sequence and mixed evenly, and then carbon black is added and mixed evenly to obtain water-based bright black wheel hub environmentally friendly coating.

[0061] Example 3

[0062] The first aspect of the present embodiment provides a water-based glossy black wheel hub environmentally friendly coating, and its preparation raw materials include, by mass percentage, 25% water-based polyester modified acrylic resin, 14% water-based acrylic modified polyester resin, 1% dispersant, 3% solvent, 5% amino resin, 2.5% carbon black, 10% filler, 0.2% defoaming agent, 0.5% wetting and leveling agent, and the remainder water.

[0063] The water is deionized water.

[0064] The waterborne polyester modified acrylic resin has a hydroxyl value of 95-105 mg KOH / g, and a dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. of 4000-18000 cps.

[0065] The water-based polyester modified acrylic resin was purchased from Guangdong Qirun New Materials Co., Ltd., model number PKA605.

[0066] The water-based acrylic modified polyester resin was purchased from Allnex USA 6306SS-60.

[0067] The dispersant was purchased from BASF Ultra PX-4565.

[0068] The solvent is ethylene glycol butyl ether, Dow BCS from the United States.

[0069] The amino resin is of the type 303LF and model 327 amino resin composition, the model is 327 amino resin and model The mass ratio of amino resin of 303LF is 1:1.5.

[0070] The wetting and leveling agent is purchased from German manufacturer's model number Tego 4100 and German manufacturer's model number BYK381; and the mass ratio of the wetting and leveling agent of Tego 4100 to the wetting and leveling agent of BYK381 is 0.5:1.

[0071] The defoamer was purchased from Germany's Digo 104E.

[0072] The filler consists of talcum powder and silicon micropowder, and the mass ratio of the talcum powder to the silicon micropowder is 1:1.

[0073] The particle size of the talcum powder is 2500 mesh, and the manufacturer purchased is Guangfu Building Materials (Jiaoling) Refining Co., Ltd.

[0074] The particle size of the silicon micropowder is 1250 mesh, and the manufacturer purchased is Guangfu Building Materials (Jiaoling) Refining Co., Ltd.

[0075] A second aspect of the present embodiment provides a method for preparing a water-based glossy black wheel hub environmentally friendly coating, comprising the following steps:

[0076] After mixing water-based polyester modified acrylic resin, water-based acrylic modified polyester resin, amino resin and solvent, dispersant, defoamer, wetting and leveling agent and filler are added in sequence and mixed evenly, and then carbon black is added and mixed evenly to obtain water-based bright black wheel hub environmentally friendly coating.

[0077] Example 4

[0078] The first aspect of the present embodiment provides a water-based glossy black wheel hub environmentally friendly coating. The raw materials for its preparation include, by mass percentage, 40% water-based polyester modified acrylic resin, 1% dispersant, 3% solvent, 5% amino resin, 2.5% carbon black, 10% filler, 0.2% defoaming agent, 0.5% wetting and leveling agent, and the remainder water.

[0079] The water is deionized water.

[0080] The waterborne polyester modified acrylic resin has a hydroxyl value of 95-105 mg KOH / g, and a dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. of 4000-18000 cps.

[0081] The water-based polyester modified acrylic resin was purchased from Guangdong Qirun New Materials Co., Ltd., model number PKA605.

[0082] The dispersant was purchased from ADDITOL VXW6208 of the United States.

[0083] The solvent is ethylene glycol butyl ether, Dow BCS from the United States.

[0084] The amino resin is of the type 303LF.

[0085] The wetting and leveling agent was purchased from Germany's Digo 4100.

[0086] The defoamer was purchased from Germany's Digo 104E.

[0087] The filler is talc.

[0088] The particle size of the talcum powder is 2500 mesh, and the manufacturer purchased is Guangfu Building Materials (Jiaoling) Refining Co., Ltd.

[0089] A second aspect of the present embodiment provides a method for preparing a water-based glossy black wheel hub environmentally friendly coating, comprising the following steps:

[0090] After mixing water-based polyester modified acrylic resin, amino resin and solvent, dispersant, defoamer, wetting and leveling agent and filler are added in sequence and mixed evenly, and then carbon black is added and mixed evenly to obtain water-based bright black wheel hub environmentally friendly coating.

[0091] Example 5

[0092] The first aspect of the present embodiment provides a water-based glossy black wheel hub environmentally friendly coating, and its preparation raw materials include, by mass percentage, 25% water-based polyester modified acrylic resin, 14% water-based acrylic modified polyester resin, 1% dispersant, 3% solvent, 5% amino resin, 2.5% carbon black, 10% filler, 0.2% defoaming agent, 0.5% wetting and leveling agent, and the remainder water.

[0093] The water is deionized water.

[0094] The waterborne polyester modified acrylic resin has a hydroxyl value of 95-105 mg KOH / g, and a dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. of 4000-18000 cps.

[0095] The water-based polyester modified acrylic resin was purchased from Guangdong Qirun New Materials Co., Ltd., model number PKA605.

[0096] The water-based acrylic modified polyester resin was purchased from Allnex USA 6306SS-60.

[0097] The dispersant was purchased from BASF Ultra PX-4565.

[0098] The solvent is ethylene glycol butyl ether, Dow BCS from the United States.

[0099] The amino resin is of the type 303LF.

[0100] The wetting and leveling agent was purchased from Germany's Digo 4100.

[0101] The defoamer was purchased from Germany's Digo 104E.

[0102] The filler is talc.

[0103] The particle size of the talcum powder is 2500 mesh, and the manufacturer purchased is Guangfu Building Materials (Jiaoling) Refining Co., Ltd.

[0104] A second aspect of the present embodiment provides a method for preparing a water-based glossy black wheel hub environmentally friendly coating, comprising the following steps:

[0105] After mixing water-based polyester modified acrylic resin, water-based acrylic modified polyester resin, amino resin and solvent, dispersant, defoamer, wetting and leveling agent and filler are added in sequence and mixed evenly, and then carbon black is added and mixed evenly to obtain water-based bright black wheel hub environmentally friendly coating.

[0106] Performance Testing

[0107] The water-based glossy black wheel hub environmentally friendly coatings prepared in Examples 1-5 were subjected to the following performance tests according to the following test methods. The test results are shown in Table 1.

[0108] 1. Paint gloss test method: GB / T 9754 "Determination of gloss at 20°, 60° and 85° for paints and varnishes".

[0109] 2. Paint blackness test method: GB / T 7048-2012 "Determination of the blackness of carbon black pigments".

[0110] 3. Paint hiding power test method: GB / T 1726-1979 (confirmed in 1989) "Determination of coating hiding power".

[0111] 4. Paint recoatability test method: GB / T 1727-92 "General preparation method for paint films".

[0112] The water-based glossy black wheel hub environmentally friendly paint provided in Examples 1-5 was subjected to a matching recoatability test of spraying a commercially available base powder + water-based glossy black wheel hub environmentally friendly paint + topcoat powder according to the following test method, and the interlayer adhesion was tested according to GB / T 9286.

[0113] The base powder is a commercially available polyester powder coating, and the spraying thickness of the base powder is 100 μm, forming a base powder layer; a water-based glossy black wheel hub environmentally friendly coating is sprayed on the base powder layer, and the spraying thickness of the water-based glossy black wheel hub environmentally friendly coating is 25 μm, forming a coating layer; a finishing powder is sprayed on the coating layer, and the spraying thickness of the finishing powder is 100 μm, forming a finishing layer.

[0114] The glazing powder is a commercially available acrylic powder coating.

[0115] 5. Coating machinability test method: cutting test method.

[0116] 6. Copper accelerated acetic acid salt spray test (CASS) method: GB / T 10125-2021 "Artificial atmosphere corrosion test salt spray test".

[0117] Table 1

[0118]

[0119] It can be seen from the test results in Table 1 that the water-based glossy black wheel hub environmentally friendly coating provided in Examples 1-3 has good recoatability, can be recoated 3 times, and the adhesion is maintained above level 1. The water-based glossy black wheel hub environmentally friendly coating has a high hiding sandpaper texture and can meet the requirements of 600-mesh sandpaper. It has the characteristics of high gloss and fullness, high blackness, good matching with primer powder, glazing powder and glazing oil, strong construction adaptability, meets the requirements of subsequent machining, and the paint film is intact after machining of the matching coating, without edge collapse or falling off.

Claims

1. A water-based glossy black wheel hub environmentally friendly paint, characterized in that: Calculated by mass percentage, the preparation raw materials include 20-30% of waterborne polyester modified acrylic resin, 10-20% of waterborne acrylic modified polyester resin, 0.8-2% of dispersant, 2-6% of solvent, 2-8% of amino resin, 1-3.5% of carbon black, 2-10% of filler, 0.2-2% of defoamer, 0.2-2% of wetting and leveling agent, and the balance of water.

2. The water-based glossy black wheel hub environmentally friendly paint according to claim 1, characterized in that: The mass ratio of the water-based polyester modified acrylic resin to the water-based acrylic modified polyester resin is 1:(0.4-0.8).

3. The water-based glossy black wheel hub environmentally friendly paint according to claim 1, characterized in that: The waterborne polyester modified acrylic resin has a hydroxyl value of 95-105 mg KOH / g, and a dynamic viscosity of the waterborne polyester modified acrylic resin at 30° C. of 4000-18000 cps.

4. The water-based glossy black wheel hub environmentally friendly paint according to claim 1, characterized in that: The dispersant includes an acrylic block copolymer.

5. The water-based glossy black wheel hub environmentally friendly paint according to claim 1, characterized in that: The amino resin selected includes 303LF, 327.

6. The water-based bright black wheel hub environmentally friendly paint according to claim 1, characterized in that: The types of wetting and leveling agents used include Digo 4100 and BYK381.

7. The water-based glossy black wheel hub environmentally friendly paint according to claim 1, characterized in that: The filler includes talc and / or silica powder.

8. The water-based glossy black wheel hub environmentally friendly paint according to claim 7, characterized in that: The particle size of the talcum powder is 2000-3000 mesh.

9. The water-based glossy black wheel hub environmentally friendly paint according to claim 7, characterized in that: The particle size of the silicon micropowder is 1000-1500 mesh.

10. A method for preparing the water-based glossy black wheel hub environmentally friendly coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: The prepared raw materials are mixed to obtain a water-based bright black wheel hub environmentally friendly coating.

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