Environment-friendly high-color coating as well as preparation method and application thereof

Abstract

The invention provides an environment-friendly high-color coating as well as a preparation method and application thereof, the environment-friendly high-color coating is prepared by mixing a component A and a component B, and the ratio of the component A to the component B is not higher than 1: 1 and not lower than 1: 7; the component A comprises two kinds of nano silicon dioxide dispersion liquid with different particle sizes, color paste, inorganic salt and acrylic resin polyol, the nano silicon dioxide dispersion liquid is formed by mixing nano silicon dioxide, sodium polyacrylate, an organic solvent and deionized water, and the solid content is not lower than 35% and not higher than 50%; and the component B comprises an auxiliary agent and deionized water. According to the environment-friendly high-color coating as well as the preparation method and the application thereof, the coating with the characteristics of high visual effect, excellent outdoor weather resistance and the like can be prepared, and development of the environment-friendly high-color coating is achieved through a copolymerization effect among nanoparticles.

Description

Technical Field

[0001] This invention belongs to the technical field of multifunctional environmentally friendly coatings, specifically relating to an environmentally friendly high-color coating, its preparation method, and its application. Background Technology

[0002] In today's era, with the rapid development of industries such as electronics and car stickers, the demand for color in signage, posters, banners, etc. is increasing. This is to attract customers' attention with more eye-catching colors and contrasts in product promotional posters, and at the same time to present new products to customers with more realistic colors, giving them an immersive visual experience even when they are thousands of miles away.

[0003] However, compared to conventional coatings, high-color coatings have excellent characteristics such as high color saturation and high visual color rendering, but their high cost, poor weather resistance and limited application scenarios are becoming increasingly apparent. On the other hand, environmentally friendly coatings occupy an important position in the modern coating industry due to their low pollution, excellent weather resistance and durability. Summary of the Invention

[0004] The purpose of this invention is to provide an environmentally friendly high-color coating, its preparation method, and its application. It solves the technical problem of how to prepare a coating that has both high visual effect and excellent outdoor weather resistance. The invention achieves the development of an environmentally friendly high-color coating through the copolymerization effect between nanoparticles.

[0005] An environmentally friendly high-color coating comprises a mixture of component A and component B, wherein the ratio of component A to component B is not higher than 1:1 and not lower than 1:7. Component A comprises two nano-silica dispersions with different particle sizes, a color paste, inorganic salts, and an acrylic resin polyol. The nano-silica dispersion is composed of nano-silica, sodium polyacrylate, an organic solvent, and deionized water, with a solid content of not less than 35% and not more than 50%. Component B includes additives and deionized water.

[0006] By mass, the proportions of raw materials in component A are as follows: 5-10 parts small-particle-size silica, 1-4 parts large-particle-size silica, 0.3-0.8 parts sodium polyacrylate, 50-60 parts acrylic resin polyol, 1-4 parts color paste, 5-10 parts inorganic salt, and 15-25 parts deionized water. Component B contains 1-5 parts of auxiliary agents and 55-65 parts of deionized water.

[0007] By mass fraction, (small-particle-size silica + large-particle-size silica) / acrylic resin polyol = 0.15-0.25.

[0008] By mass fraction, (pigment paste + inorganic salt) / additives = 2-12.

[0009] Small-particle-size nano-silica has a particle size range of 5-30 nm, while large-particle-size nano-silica has a particle size range of 100-500 nm.

[0010] The additives include any one or a combination of at least two of the dispersants, whitening agents, and wetting agents.

[0011] The color paste is a polyurethane-acrylic hybrid resin system color paste, and its mass percentage in component A is not higher than 5%; the inorganic salt is an emulsion system, and its mass percentage in component A is not higher than 5.5%.

[0012] A method for preparing an environmentally friendly high-color coating, specifically including the following steps: Step S1: Preparation of nano-silica dispersion: High-speed dispersion and grinding method is used, with a grinding frequency of not less than 35Hz and not more than 50Hz; Step S2: Mix nano-silica with sodium polyacrylate, organic solvent and deionized water to prepare a uniformly dispersed and transparent nano-silica dispersion. Step S3: Preparation of mixed resin: After mixing the nano silica dispersion from step S2 with other raw materials of component A, it is then mixed with the raw materials of component B to obtain mixed resin. During mixing, it is necessary to stir continuously at a low speed, with a stirring speed of not less than 20Hz and not more than 35Hz. Step S4: Coating preparation: The mixed resin is applied to conventional substrates such as PP and PET, and the curing temperature range is 50-90℃, and the curing time range is 0.5-3min to obtain an environmentally friendly high-color coating.

[0013] An environmentally friendly high-color coating is applied to a product, such as a sign, poster, or vehicle sticker, the surface of which is coated with an environmentally friendly high-color coating.

[0014] It should be noted that the high-color coating mentioned in this solution refers to a coating where the colors of the image and the substrate have a high contrast after the image is printed on the substrate, meaning that the color contrast is more prominent.

[0015] This invention achieves the following significant effects: (1) This patent has invented an environmentally friendly high color coating with excellent features such as high color saturation, high visual color rendering, fast ink drying speed, excellent outdoor weather resistance, and low pollution. At the same time, the formula can adapt to a variety of silica nanoparticles with different particle sizes, and will show good adaptability and stability under different conditions in the future coating industry.

[0016] (2) Based on the copolymerization effect of silica nanoparticles, this invention aims to use various silica nanoparticles of different particle sizes commonly available on the market to copolymerize small-sized nanoparticles and large-sized nanoparticles in a disordered state at low temperature by utilizing the copolymerization reaction between ions. Meanwhile, because large-particle nanoparticles have a high specific surface area and adsorption capacity, small-particle nanoparticles can be better adsorbed on their surface; this not only retains the gaming performance such as the drying speed of large-particle nanoparticles, but also allows the addition of a small amount of small-particle nanoparticles to achieve better color performance and visual effects in the original coating.

[0017] (3) The pigment paste in this scheme provides the basic color, and its pigment type (organic / inorganic), particle size and dispersion directly determine the saturation; nano SiO2 generates structural color by forming a photonic crystal structure, which can significantly enhance the color saturation and brightness; acrylic resin polyol, as a film-forming agent, affects the transparency and gloss of the paint film, thereby affecting the color presentation; additives (such as dispersants) ensure stable dispersion of pigments and prevent flocculation and blooming.

[0018] (4) The volatility of organic solvents is the primary factor determining the initial drying (surface drying) speed; the high specific surface area and porous structure of nano-SiO2 can quickly absorb solvents and low molecular weight substances, accelerating curing; some inorganic pigments of inorganic salts have a catalytic effect on oxidative polymerization drying; additives such as drying agents can significantly accelerate the oxidative crosslinking process. Attached Figure Description

[0019] Figure 1 This is a physical image of the coating (before painting) in test group 1 of embodiment 1 of the present invention.

[0020] Figure 2 This is a physical image of the coating (before painting) in Embodiment 2 of the present invention.

[0021] Figure 3 This is a physical image of the coating (after marking) in Embodiment 2 of the present invention. Detailed Implementation

[0022] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution. Example

[0023] An environmentally friendly high-color coating comprises a mixture of component A and component B, wherein the ratio of component A to component B is not higher than 1:1 and not lower than 1:7. Component A comprises two nano-silica dispersions with different particle sizes, a color paste, inorganic salts, and an acrylic resin polyol. The nano-silica dispersion is composed of nano-silica, sodium polyacrylate, an organic solvent, and deionized water, with a solid content of not less than 35% and not more than 50%. Component B includes additives and deionized water.

[0024] By mass, the proportions of raw materials in component A are as follows: 5-10 parts small-particle-size silica, 1-4 parts large-particle-size silica, 0.3-0.8 parts sodium polyacrylate, 50-60 parts acrylic resin polyol, 1-4 parts color paste, 5-10 parts inorganic salt, and 15-25 parts deionized water. Component B contains 1-5 parts of auxiliary agents and 55-65 parts of deionized water.

[0025] By mass fraction, (small-particle-size silica + large-particle-size silica) / acrylic resin polyol = 0.15-0.25.

[0026] Small-particle-size nano-silica has a particle size range of 5-30 nm, while large-particle-size nano-silica has a particle size range of 100-500 nm.

[0027] The additives include any one or a combination of at least two of the dispersants, whitening agents, and wetting agents.

[0028] The color paste is a polyurethane-acrylic hybrid resin system color paste, and its mass percentage in component A is not higher than 5%; the inorganic salt is an emulsion system, and its mass percentage in component A is not higher than 5.5%.

[0029] In Example 1, multiple sets of experiments were designed to investigate the effects of small-particle-size silica, large-particle-size silica, and acrylic resin polyol on coating properties. The specific experimental groups are as follows: Experimental Group 1: 5 parts small-particle-size silica, 4 parts large-particle-size silica, 50 parts acrylic resin polyol, see [link to relevant documentation]. Figure 1 Actual product rendering; Experimental Group 2: 7 parts small-particle-size silica, 3 parts large-particle-size silica, and 55 parts acrylic resin polyol; Experimental Group 3: 10 parts small-particle-size silica, 1 part large-particle-size silica, and 60 parts acrylic resin polyol; Comparative group 1: 5 parts small-particle-size silica, 1 part large-particle-size silica; To reduce the final production cost, the remaining components are calculated to the minimum values: 0.3 parts sodium polyacrylate, 1 part colorant, 5 parts inorganic salt, and 15 parts deionized water. Component B contains 1 part additive and 55 parts deionized water. Table 1 shows the coating performance of each test group.

[0030] Table 1 shows the coating performance of each of the above test groups. experimental group Color saturation Color gamut coverage initial dryness / min UV intensity W / m²@340nm VOCs content (mg / kg) Experimental group 1 65% 30% 5 3 ≤84 Experimental group 2 74% 41% 4 5 ≤78 Experimental group 3 79% 52% 5 6 ≤61 Comparison Group 1 50% 25% 4 2 ≤88 Color saturation explanation: In the HSV / HSB color model, saturation represents the purity of a color, ranging from 0% (gray) to 100% (fully saturated). The higher the value, the more vivid the color. The reference standard is: basic concepts of color science, commonly measured by the HSV / HSB model.

[0031] Color gamut coverage: The percentage of the color range that the ink can reproduce relative to the standard color gamut (such as sRGB, Adobe RGB). The higher the coverage, the stronger the visual color rendering. The reference standard is usually measured through ICC profiles, such as Pantone coverage.

[0032] Initial drying time: The time it takes for ink to form a solid film on the substrate, usually measured in minutes; the reference standard is GB / T 13217.5-2023 "Ink Drying Test Method".

[0033] UV irradiation intensity description: Simulates the intensity of outdoor UV radiation (e.g., 3 W / m²@340nm) for accelerated aging testing; reference standard: GB / T 20236-2025 "Concentrated light accelerated outdoor exposure test method for non-metallic materials".

[0034] VOCs content description: The total amount of volatile organic compounds in inks, with limits varying depending on the type (solvent-based ≤800 mg / kg, water-based ≤300 mg / kg, UV ≤100 mg / kg); the reference standard is: GB 38507-2020 "Limits of Volatile Organic Compounds (VOCs) Content in Inks".

[0035] As shown in Table 1, from experimental groups 1-3 to the control group, both color saturation and color gamut coverage increased, indicating that small-particle-size silica and acrylic resin polyols contribute to the increase in color saturation and color gamut coverage. Initial drying properties remained relatively stable overall, suggesting that both small-particle-size and large-particle-size silica affected initial drying properties. The tolerable UV intensity increased, indicating that the effect of acrylic resin polyols was significantly more pronounced. VOC content decreased, indicating that small-particle-size silica and acrylic resin polyols helped increase the absorption of toxic gases. In the control group, when acrylic resin polyols were absent, color saturation, color gamut coverage, and tolerable UV intensity all increased, while VOC content decreased. Example

[0036] See Figure 2 and Figure 3 Based on Example 1, the actual product effect diagram leads to Example 2.

[0037] By mass fraction, (pigment paste + inorganic salt) / additives = 2-12.

[0038] In this Example 2, compared with test group 1 in Example 1, multiple sets of experiments were designed as follows to investigate the effects of color paste, inorganic salt, and additives on coating properties. The specific test groups are as follows: Experimental group 11: 1 part color paste, 10 parts inorganic salt, 1 part additive; Experimental group 12: 2 parts color paste, 8 parts inorganic salt, 3 parts additives; Experimental group 13: 4 parts pigment paste, 5 parts inorganic salt, 5 parts additives; To reduce the final production cost, the remaining components were calculated at their minimum values, by mass parts. The raw material proportions in component A were: 5 parts small-particle-size silica, 4 parts large-particle-size silica, 0.3 parts sodium polyacrylate, 50 parts acrylic resin polyol, and 15 parts deionized water; component B contained 55 parts deionized water. Table 2 shows the coating performance of the above test groups.

[0039] Table 1 shows the coating performance of each of the above test groups. experimental group Color saturation Color gamut coverage initial dryness / min UV intensity W / m²@340nm VOCs content (mg / kg) Experimental group 11 67% 38% 5 3 ≤81 Experimental group 12 75% 45% 3 6 ≤74 Experimental group 13 82% 57% 5 6 ≤59 As can be seen from Table 1, color saturation and color gamut coverage have increased, indicating that pigments and additives have a significant impact on these two aspects and have an important improving effect. The decrease in inorganic salt content, under the combined effect, results in little change in initial drying and UV resistance, while VOCs content shows a significant decrease. Example

[0040] This third embodiment is derived from Embodiments 1 and 2.

[0041] A method for preparing an environmentally friendly high-color coating, specifically including the following steps: Step S1: Preparation of nano-silica dispersion: High-speed dispersion and grinding method is used, with a grinding frequency of not less than 35Hz and not more than 50Hz; Step S2: Mix nano-silica with sodium polyacrylate, organic solvent and deionized water to prepare a uniformly dispersed and transparent nano-silica dispersion. Step S3: Preparation of mixed resin: After mixing the nano silica dispersion from step S2 with other raw materials of component A, it is then mixed with the raw materials of component B to obtain mixed resin. During mixing, it is necessary to stir continuously at a low speed, with a stirring speed of not less than 20Hz and not more than 35Hz. Step S4: Coating preparation: The mixed resin is applied to conventional substrates such as PP and PET, and the curing temperature range is 50-90℃, and the curing time range is 0.5-3min to obtain an environmentally friendly high-color coating.

[0042] An environmentally friendly high-color coating is applied to a product, such as a sign, poster, or vehicle sticker, the surface of which is coated with an environmentally friendly high-color coating.

[0043] It should be noted that this embodiment 3 is applied to embodiments 1 and 2. In order to reduce costs, the parameter ranges in this embodiment 3 all adopt the minimum values.

[0044] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. An environmentally friendly high-color coating, characterized in that, It is composed of a mixture of component A and component B, wherein the ratio of component A to component B is not higher than 1:1 and not lower than 1:7; Component A comprises two nano-silica dispersions with different particle sizes, a color paste, inorganic salts, and an acrylic resin polyol. The nano-silica dispersion is composed of nano-silica, sodium polyacrylate, an organic solvent, and deionized water, with a solid content of not less than 35% and not more than 50%. Component B includes additives and deionized water.

2. The environmentally friendly high-color coating according to claim 1, characterized in that, By mass, the proportions of raw materials in component A are as follows: 5-10 parts small-particle-size silica, 1-4 parts large-particle-size silica, 0.3-0.8 parts sodium polyacrylate, 50-60 parts acrylic resin polyol, 1-4 parts color paste, 5-10 parts inorganic salt, and 15-25 parts deionized water. Component B contains 1-5 parts of auxiliary agents and 55-65 parts of deionized water.

3. The environmentally friendly high-color coating according to claim 2, characterized in that, By mass fraction, (small-particle-size silica + large-particle-size silica) / acrylic resin polyol = 0.15-0.

25.

4. The environmentally friendly high-color coating according to claim 2, characterized in that, By mass fraction, (pigment paste + inorganic salt) / additives = 2-12.

5. The environmentally friendly high-color coating according to claim 2, characterized in that, Small-particle-size nano-silica has a particle size range of 5-30 nm, while large-particle-size nano-silica has a particle size range of 100-500 nm.

6. The environmentally friendly high-color coating according to claim 1, characterized in that, The additives include any one or a combination of at least two of the dispersants, whitening agents, and wetting agents.

7. The environmentally friendly high-color coating according to claim 1, characterized in that, The color paste is a polyurethane-acrylic hybrid resin system color paste, and its mass percentage in component A is not higher than 5%; the inorganic salt is an emulsion system, and its mass percentage in component A is not higher than 5.5%.

8. A method for preparing an environmentally friendly high-color coating, used to prepare an environmentally friendly high-color coating as described in any one of claims 1-7, characterized in that, Specifically, the steps include the following: Step S1: Preparation of nano-silica dispersion: High-speed dispersion and grinding method is used, with a grinding frequency of not less than 35Hz and not more than 50Hz; Step S2: Mix nano-silica with sodium polyacrylate, organic solvent and deionized water to prepare a uniformly dispersed and transparent nano-silica dispersion. Step S3: Preparation of mixed resin: After mixing the nano silica dispersion from step S2 with other raw materials of component A, it is then mixed with the raw materials of component B to obtain mixed resin. During mixing, it is necessary to stir continuously at a low speed, with a stirring speed of not less than 20Hz and not more than 35Hz. Step S4: Coating preparation: The mixed resin is applied to conventional substrates such as PP and PET, and the curing temperature range is 50-90℃, and the curing time range is 0.5-3min to obtain an environmentally friendly high-color coating.

9. An application of an environmentally friendly high-color coating, characterized in that, The coating is applied to articles, such as signs, posters, or vehicle stickers, whose surfaces are coated with an environmentally friendly, high-color coating according to any one of claims 1 to 7.

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