High-quality two-component water-based black high-gloss paint for general machinery as well as preparation method and application method of high-quality two-component water-based black high-gloss paint

Abstract

The invention provides high-quality two-component water-based black high-gloss paint for general machinery as well as a preparation method and an application method of the high-quality two-component water-based black high-gloss paint. The two-component water-based black high-gloss paint is composed of a component A and a component B. The component A comprises two water-based acrylic resins, a carbon black pigment and a processing aid and is used for providing active groups and improving the performance of a paint film. The component B comprises a water-based aliphatic isocyanate curing agent and a cosolvent, and is used for carrying out cross-linking reaction with the active groups in the component A to form a compact three-dimensional network structure. According to the two-component water-based black high-gloss paint, water is used as a dispersion medium, and the VOC content is far lower than the national standard. Through the carbon black pigment and reasonable formula design, a paint film has good reflection performance under light irradiation, and the attractiveness of general gasoline engine products is enhanced. In addition, the two-component water-based black high-gloss paint has excellent performance indexes, the service life of the general gasoline engine can be effectively prolonged, the maintenance cost is reduced, and the working reliability of the general gasoline engine in a complex environment is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a high-quality two-component water-based black high-gloss paint for general machinery and a preparation method and an application method thereof. Background Art

[0002] With the increasing awareness of environmental protection and the increasingly stringent environmental regulations, traditional solvent-based coatings are facing huge challenges in the field of general machinery (general machinery) coating. Solvent-based coatings contain a large amount of volatile organic compounds (VOCs), which will evaporate into the air during the coating process, causing harm to the environment and human health. At the same time, general machinery needs to face complex environmental conditions during use, such as outdoor ultraviolet radiation, temperature changes, humidity changes, and mechanical wear, so the performance requirements of the coating are extremely high. Although the existing water-based paints on the market have been improved in terms of environmental protection, they still have shortcomings in terms of the comprehensive performance required for the use of general machinery, such as high gloss, strong adhesion, good weather resistance and wear resistance.

[0003] Black high-gloss paint can not only give general machinery products a noble and elegant appearance, but also enhance product recognition and market competitiveness. The two-component water-based paint system can provide better physical and chemical properties after curing, enabling it to adapt to the complex working environment faced by general machinery.

[0004] In summary, how to prepare black high-gloss paint with a two-component water-based paint while meeting environmental protection requirements and providing excellent appearance and performance is an urgent problem to be solved by technical personnel such as general machinery manufacturers. Summary of the invention

[0005] The purpose of the present invention is to provide a high-quality two-component water-based black high-gloss paint for general machinery. In view of the common shortcomings of water-based paint in the prior art, the present invention provides a high-quality water-based black high-gloss paint, which can not only meet environmental protection requirements and reduce VOC emissions, but also provide a high-quality black high-gloss appearance for general machinery, thereby enhancing the market competitiveness and added value of the product; at the same time, it also has excellent performance indicators, such as strong adhesion, good weather resistance, high wear resistance and many other advantages, which can effectively extend the service life of general machinery, reduce maintenance costs, and improve the working reliability of general machinery in complex environments.

[0006] To achieve the above-mentioned object, the present invention provides a high-quality two-component water-based black high-gloss paint for general machinery, wherein the two-component water-based black high-gloss paint is composed of component A and component B in a weight ratio of (3-7):1, wherein component A includes two water-based acrylic resins, carbon black pigment and processing aid, and is used to provide active groups and improve the performance of the paint film; component B includes a water-based aliphatic isocyanate curing agent and a cosolvent, and is used to undergo a cross-linking reaction with the active groups in component A to form a dense three-dimensional network structure;

[0007] The glossiness of the two-component water-based black high-gloss paint film is above 85, and after 600 hours of accelerated aging test, the gloss retention rate of the paint film can still reach above 85. At the same time, the adhesion level reaches level 0, and the VOC content meets the national standard.

[0008] In a preferred embodiment, the weight ratio of component A to component B is 5:1. In the present invention, by mixing and curing component A and component B of a specific formula in a certain proportion, good flexibility and hardness can be provided to the paint film. At the same time, due to the design and proportion of raw materials, the purity and high gloss effect of the black color in the paint are improved, which can not only ensure the gloss of the paint film, but also reduce the VOC content, thereby achieving a green and environmentally friendly effect.

[0009] In a preferred embodiment, the component A specifically includes the following components by weight: 45-65 parts of two water-based acrylic resins, 2-5 parts of carbon black pigment, 10-15 parts of anti-rust additive, 0.5-2 parts of adhesion promoter, 0.1-0.5 parts of neutralizer, 1-5 parts of dispersant, 0.5-2 parts of defoamer, 0.02-0.1 parts of preservative, 0.2-0.6 parts of leveling agent and 2-10 parts of water.

[0010] In a preferred embodiment, the total weight of component A is 100 parts.

[0011] In a preferred embodiment, in component A, the two water-based acrylic resins are composed of a high hydroxyl value water-based acrylic secondary dispersion (PA-4821) and a medium hydroxyl value water-based acrylic secondary dispersion (PA-4845) in a weight ratio of 1:(0.5-2).

[0012] In a preferred embodiment, in component A, the anti-rust additive is an organic corrosion inhibitor; such as MpAdd304.

[0013] In a preferred embodiment, in component A, the adhesion promoter is a siloxane and / or titanate coupling containing active groups; such as LD3157.

[0014] In a preferred embodiment, in component A, the neutralizing agent is a low molecular weight, high alkalinity amine neutralizing agent, such as AMP-95 or DMEA.

[0015] In a preferred embodiment, in component A, the dispersant is a modified polyether containing a high pigment affinity group; such as TEG0 Dispers653.

[0016] In a preferred embodiment, in component A, the defoaming agent is an organic polymer containing fumed silica; for example, TEGO Foamex 830.

[0017] In a preferred embodiment, in component A, the preservative is a low-toxic isothiazolinone derivative, such as BEK-200L.

[0018] In a preferred embodiment, in component A, the leveling agent is BYK333.

[0019] In the present invention, the carbon black pigment is ground to have high tinting power and good dispersibility, ensuring the purity of black and high gloss effect. The dispersant can make the pigment dispersed evenly in the system to prevent agglomeration. The defoamer can eliminate bubbles generated during the production and construction of the coating. The leveling agent ensures the flatness and glossiness of the paint film surface.

[0020] In a preferred embodiment, the B component specifically comprises the following components by weight: 60-80 parts of water-based aliphatic isocyanate curing agent and 20-40 parts of co-solvent.

[0021] In a preferred embodiment, the total weight of component B is 100 parts.

[0022] In a preferred embodiment, in group B, the water-based aliphatic isocyanate curing agent is an aliphatic polyisocyanate compound, model HT100, and the manufacturer is WANHUA.

[0023] In a preferred embodiment, in group B, the co-solvent is propylene glycol methyl ether acetate.

[0024] In the present invention, component B, as a water-based curing agent, undergoes a cross-linking reaction with the active groups in component A. At the same time, in terms of raw material design, it has the characteristics of low toxicity and yellowing resistance.

[0025] Another object of the present invention is to provide a method for preparing a high-quality two-component water-based black high-gloss paint for general machinery, which specifically comprises the following steps:

[0026] Preparation of component A:

[0027] (1) Accurately weigh the raw materials of component A according to weight;

[0028] (2) Take 80% of the weight of water and add it to the dispersion tank. Under stirring, add 80% of the weight of the dispersant and 80% of the weight of the defoamer in sequence and stir until uniform.

[0029] (3) Adding carbon black pigment and anti-rust additive to the system of step (2), accelerating stirring to fully disperse them, and grinding until the slurry fineness is less than 15 μm to obtain a pigment slurry;

[0030] (4) mixing two water-based acrylic resins, a neutralizing agent, the remaining dispersant, the remaining defoaming agent, an adhesion promoter, a preservative and a leveling agent, and adding the pigment slurry with stirring, stirring at a high speed for a period of time, adding the remaining water, and mixing well to obtain the mixture;

[0031] Preparation of component B: uniformly mix the water-based aliphatic isocyanate curing agent and the co-solvent according to weight parts to obtain;

[0032] After mixing the prepared component A and component B according to the weight ratio, adding water and stirring for 1-2 minutes, filtering through a filter screen to obtain a high-quality two-component water-based black high-gloss paint; preferably, the viscosity of the mixture after adding water and stirring is 30-65s; preferably, the filtering filter screen is 100-150 mesh.

[0033] In a preferred embodiment, in step (2), the stirring speed is 300-500 rpm.

[0034] In a preferred embodiment, in step (3), the stirring speed is 800-1000 rpm.

[0035] In a preferred embodiment, in step (4), the stirring speed is 800-1000 rpm, and the stirring time is 20-40 min.

[0036] Another object of the present invention is to provide an application method of high-quality two-component water-based black high-gloss paint for general machinery, which specifically comprises the following steps:

[0037] The high-quality two-component water-based black high-gloss paint is applied to the surface of the machine, left to stand for a period of time at room temperature, and then dried to solidify the paint film.

[0038] In a preferred embodiment, the coating method can adopt conventional methods known to those skilled in the art, such as air spraying, electrostatic spraying, etc.; preferably, when air spraying is used, the spray gun pressure is set at 0.3-0.6 MPa, and the distance between the spray gun and the substrate surface is maintained at 15-25 cm.

[0039] In a preferred embodiment, the standing time is 10-30 min.

[0040] In a preferred embodiment, the drying condition is: baking at 70-90° C. for 10-30 min.

[0041] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0042] 1. Environmental performance: The two-component water-based black high-gloss paint of the present invention uses water as the dispersion medium, and the VOC content is far lower than the national standard, which causes little harm to the environment and operators during the coating process. Compared with traditional solvent-based black high-gloss paint, it can reduce VOC emissions by more than 98%.

[0043] 2. High gloss black appearance: The paint film prepared by the present invention has high gloss, and the gloss (60°) can reach more than 85, showing a bright black color. This is due to the high-quality carbon black pigment and reasonable formula design, which makes the paint film have good reflective performance under light irradiation, enhancing the beauty of general machine products.

[0044] 3. Curing characteristics: In the present invention, after the components A and B are mixed, a dense three-dimensional network structure is formed through the cross-linking reaction between the water-based resin and the water-based curing agent. This curing mechanism gives the paint film excellent physical properties, for example, surface drying time: within 60 minutes at room temperature 25°C, within 20 minutes at fast drying 80°C; actual drying time: within 24 hours at room temperature 25°C. At the same time, it can also improve the hardness, wear resistance and chemical resistance of the paint film.

[0045] 4. Strong adhesion: The high gloss paint of the present invention has excellent adhesion to the substrates commonly used in general machinery, such as metals (including steel, aluminum alloys, etc.) and some engineering plastics. Through the design of special additives and resin systems, a strong chemical bond and mechanical bite are formed between the paint film and the substrate, and the adhesion level can reach level 0, effectively preventing the paint film from peeling and peeling during the use of the general machinery.

[0046] 5. Good weather resistance: Under long-term outdoor use conditions, the paint film prepared by the present invention can resist the influence of environmental factors such as ultraviolet radiation, rain erosion, temperature changes, etc. After 600 hours of accelerated aging test (such as xenon lamp aging test), the gloss retention rate of the paint film can still reach more than 85, and the color change is very small, ensuring the long-term stability of the appearance of the general machine. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods, but it should be understood that the protection scope of the present invention is not limited by the specific implementation methods.

[0048] The embodiments of the present invention solve the technical problem that conventional water-based paints in the prior art cannot simultaneously take into account environmental protection performance, high gloss, strong adhesion, good weather resistance, wear resistance and other properties by providing a high-quality two-component water-based black high-gloss paint for general machinery and a preparation method and an application method thereof.

[0049] The technical solution of the present application is described in detail below through specific embodiments:

[0050] Unless otherwise specified, the technical means used in the present invention are conventional means well known to those skilled in the art, and the various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods. The reagents used in the present invention are analytically pure unless otherwise specified.

[0051] In the present invention, the high hydroxyl value water-based acrylic secondary dispersion model used is PA-4821, and the medium hydroxyl value water-based acrylic secondary dispersion model used is PA-4845, both of which are produced by Guangzhou Guanzhi New Material Technology Co., Ltd.; the anti-rust additive model is MpAdd304, which is provided by Silicon Carbon Mouse Chemical Park; the adhesion promoter model is LD3157, which is provided by Jiangsu Lirunda New Material Technology Co., Ltd.; the neutralizer model is DMEA; the dispersant model is TEGODispers653; the defoamer model is TEGO Foamex830; the preservative model is BEK-200L; the leveling agent model is BYK333.

[0052] In the present invention, parts by weight may be μg, mg, g, kg or other weight units known in the art, or multiples thereof, such as 1 / 10, 1 / 100, 10 times, 100 times or the like.

[0053] Example 1

[0054] A high quality two-component water-based black high gloss paint for general machinery, the formula is:

[0055] Component A: 65.0 parts of two water-based acrylic resins, 2.8 parts of carbon black pigment, 14.5 parts of anti-rust additive, 1.8 parts of adhesion promoter, 0.4 parts of neutralizer, 4.8 parts of dispersant, 1.0 parts of defoamer, 0.03 parts of preservative, 0.8 parts of leveling agent and 8.87 parts of water.

[0056] Component B: 65 parts of water-based aliphatic isocyanate curing agent and 35 parts of co-solvent.

[0057] The specific preparation method comprises the following steps:

[0058] Preparation of component A:

[0059] (1) Accurately weigh the raw materials of component A according to weight;

[0060] (2) 80% of the weight of water is added to the dispersion tank, and 80% of the weight of the dispersant and 80% of the weight of the defoamer are added in sequence under stirring, and stirred until uniform. The stirring speed in this step is 300 rpm;

[0061] (3) Adding carbon black pigment and anti-rust additive to the system of step (2), accelerating stirring to fully disperse them, and grinding until the slurry fineness is less than 15 μm to obtain a pigment slurry. The stirring speed in this step is 800 rpm;

[0062] (4) After the two water-based acrylic resins, the neutralizer, the remaining dispersant, the remaining defoamer, the adhesion promoter, the preservative and the leveling agent are mixed uniformly, the pigment slurry is added at 800 rpm, and then stirred at 800 rpm for 20 min, and the remaining water is added and mixed uniformly to obtain the mixture;

[0063] Preparation of component B: uniformly mix the water-based aliphatic isocyanate curing agent and the co-solvent according to parts by weight;

[0064] The prepared component A and component B are mixed in a weight ratio of 5:1, and water is added and stirred for 1 to 2 minutes. The viscosity of the mixture is 30-65s. After filtering with a 100-mesh filter, a high-quality two-component water-based black high-gloss paint is obtained.

[0065] Application Examples

[0066] The two-component water-based black high-gloss paint prepared in Example 1 was applied to the surface of the tinplate by air spraying, and after coating, it was left to stand at room temperature for 20 minutes, and then baked at 80°C for 20 minutes until the paint film was completely cured, and its performance effect was tested, and the results are shown in Table 1. The coating conditions are as follows: the spray gun pressure is set at 0.3 MPa, and the distance between the spray gun and the substrate surface is maintained at 15 cm.

[0067] Table 1

[0068] Test items Test results Detection Methods 1 Color Appearance Black, smooth and flat. Visual inspection 2 Gloss (60°) 91 GB / T 9754 3 Flexibility (1MM) pass GB / T 1731 4 Pencil hardness (HB) HB GB / T 6739 5 Impact resistance (50KG.CM) pass GB / T 1732 6 Cross-cut Adhesion Level 0 GB / T 9286

[0069] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A high-quality two-component water-based black high-gloss paint for general machinery, characterized in that: The two-component water-based black high-gloss paint is composed of component A and component B in a weight ratio of (3-7):1, wherein component A includes two water-based acrylic resins, carbon black pigment and processing aid, which are used to provide active groups and improve the performance of the paint film; component B includes a water-based aliphatic isocyanate curing agent and a cosolvent, which are used to undergo a cross-linking reaction with the active groups in component A to form a dense three-dimensional network structure; The glossiness of the two-component water-based black high-gloss paint film is above 85, and after 600 hours of accelerated aging test, the gloss retention rate of the paint film can still reach above 85. At the same time, the adhesion level reaches level 0, and the VOC content meets the national standard.

2. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 1, characterized in that: The component A specifically includes the following components by weight: 45-65 parts of two water-based acrylic resins, 2-5 parts of carbon black pigment, 10-15 parts of anti-rust additive, 0.5-2 parts of adhesion promoter, 0.1-0.5 parts of neutralizer, 1-5 parts of dispersant, 0.5-2 parts of defoamer, 0.02-0.1 parts of preservative, 0.2-0.6 parts of leveling agent and 2-10 parts of water.

3. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 2, characterized in that: The total weight of component A is 100 parts.

4. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 2, characterized in that: In component A, the two water-based acrylic resins are composed of a high-hydroxyl value water-based acrylic secondary dispersion and a medium-hydroxyl value water-based acrylic secondary dispersion in a weight ratio of 1:(0.5-2).

5. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 2, characterized in that: In component A, the anti-rust additive is an organic corrosion inhibitor; the adhesion promoter is a siloxane and / or titanate coupling containing active groups; the neutralizer is a low molecular weight, high alkalinity amine neutralizer; the dispersant is a modified polyether containing a high pigment affinity group; the defoamer is an organic polymer containing fumed silica; the preservative is a low-toxic isothiazolinone derivative; and the leveling agent is BYK333.

6. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 1, characterized in that: The B component specifically includes the following components by weight: 60-80 parts of water-based aliphatic isocyanate curing agent and 20-40 parts of co-solvent.

7. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 6, characterized in that: The total weight of the B component is 100 parts.

8. The high-quality two-component water-based black high-gloss paint for general machinery as claimed in claim 6, characterized in that: In group B, the water-based aliphatic isocyanate curing agent is an aliphatic polyisocyanate compound, model HT100; the cosolvent is propylene glycol methyl ether acetate.

9. The method for preparing a high-quality two-component water-based black high-gloss paint for general machinery according to any one of claims 1 to 8, characterized in that: The following steps are involved: Preparation of component A: (1) Accurately weigh the raw materials of component A according to weight; (2) Take 80% of the weight of water and add it to the dispersion tank. Under stirring, add 80% of the weight of the dispersant and 80% of the weight of the defoamer in sequence and stir until uniform. (3) Adding carbon black pigment and anti-rust additive to the system of step (2), accelerating stirring to fully disperse them, and grinding until the slurry fineness is less than 15 μm to obtain a pigment slurry; (4) mixing two water-based acrylic resins, a neutralizing agent, the remaining dispersant, the remaining defoaming agent, an adhesion promoter, a preservative and a leveling agent, and adding the pigment slurry with stirring, stirring at a high speed for a period of time, and adding the remaining water to obtain a product; Preparation of component B: uniformly mix the water-based aliphatic isocyanate curing agent and the co-solvent according to parts by weight; The prepared component A and component B are mixed according to the weight ratio, water is added and stirred for 1-2 minutes, and then filtered to obtain a high-quality two-component water-based black high-gloss paint.

10. The method for applying the high-quality two-component water-based black high-gloss paint for general machinery according to any one of claims 1 to 8, characterized in that: The following steps are involved: The high-quality two-component water-based black high-gloss paint is applied to the surface of the machine, left to stand for a period of time at room temperature, and then dried to solidify the paint film.