Water-based colored paint for solder resist ink as well as preparation method and application of water-based colored paint

Abstract

The invention discloses a water-based colored paint for solder resist ink and a preparation method and application thereof. The water-based colored paint comprises the following raw materials: water-based acrylic acid, blocked isocyanate, amino resin, water, a cosolvent, color paste and auxiliaries, the auxiliaries comprise a stain-resistant auxiliary, a compatibilizer and a neutralizer, the stain-resistant auxiliary comprises polysiloxane with the molecular weight of 1-100 kDa, and the compatibilizer comprises a surfactant. The water-based colored paint provided by the invention overcomes the problems that when a dark base material is coated with a traditional water-based paint, the covering power is insufficient due to relatively low film thickness, light colors are difficult to present, the wear resistance and chemical resistance are relatively poor, the environmental test resistance performance is poor, and the color is easy to change during storage.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a water-based color coating for solder resist ink, its preparation method, and its application. Background Technology

[0002] With the rapid iteration and updates of products in the consumer electronics sector, the market demand for diversified new functional coating materials is becoming increasingly prominent. Especially in terms of the appearance and color of consumer electronics, mainstream colors change every year. Therefore, while meeting the corresponding coating color requirements, the coating must also possess effective protective performance for the product.

[0003] Currently, the market lacks water-based color coatings specifically designed for special substrates. Taking PCB materials, widely used in the consumer electronics market, as an example, most PCB boards currently use dark-colored and single-color solder resist inks for insulation protection. However, when such composite boards are used as exterior components in consumer electronics products, their visual impact is not significant, making it difficult to attract consumers. To cater to consumers' aesthetic preferences, solder resist ink coatings not only need to have colors that meet consumer aesthetic needs but also need to provide protection for the solder resist ink itself.

[0004] Given that solder resist inks are mostly dark-colored, and consumer electronics products have strict requirements for coating thickness (below 25μm), when applying various colored coatings, the coating must possess good hiding power and color stability to meet the appearance color requirements while ensuring that the protective function of the product is not affected. Under the condition of a single coating and low film thickness, simultaneously meeting multiple requirements such as high hiding power, color stability, adhesion, abrasion resistance, chemical resistance, and environmental testing performance is an extremely challenging task for coating materials.

[0005] Existing coatings are difficult to meet the above requirements simultaneously. Therefore, it is of great significance to develop a new water-based color coating that can be used for solder resist inks. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a water-based color coating, which has good pigment carrying capacity and advantages such as simple and convenient application and long service life.

[0007] The present invention also proposes a method for preparing the above-mentioned water-based color coating.

[0008] The present invention also proposes the application of the above-mentioned water-based color coatings.

[0009] According to one aspect of the present invention, a waterborne color coating is provided, comprising the following raw materials: waterborne acrylic acid, blocked isocyanate, amino resin, water, cosolvent, color paste and additives, wherein the additives include a stain-resistant additive and a compatibilizer, wherein the stain-resistant additive comprises a polysiloxane with a molecular weight of 1 to 100 kDa, and the compatibilizer comprises a surfactant, wherein the surfactant is electrically neutral in aqueous solution.

[0010] The water-based color coating of the present invention has at least the following beneficial effects: The water-based color coating of the present invention overcomes the problems of insufficient hiding power, difficulty in presenting light colors, poor abrasion resistance, chemical resistance, poor environmental performance, and easy discoloration during storage caused by the low film thickness of traditional water-based coatings when applied to dark substrates. The coating formulation has good pigment carrying capacity, is easy to apply, and has a long service life. The prepared coating not only has excellent thermal storage stability, but the cured film also has excellent adhesion, abrasion resistance, oleic acid resistance, chemical resistance, high temperature and humidity resistance, and resistance to thermal cycling. The compatibilizer added to the system helps to achieve balance and stability between phase molecules, as it can effectively reduce interfacial free energy and regulate the surface tension between components, thereby forming a uniform and stable dispersion system, thus improving the color stability of the color coating, enhancing the compatibility of the system, and ensuring stable performance of the coating during the curing process. The stain-resistant additive has a medium-to-low molecular weight structure. Its polyether segments bind to the resin matrix through polar interactions, while the siloxane segments extend to the coating surface, forming a hydrophobic layer that protects the paint film. The addition of the stain-resistant additive significantly improves the coating's stain resistance, primarily due to the synergistic effect between the additive and the resin components. Waterborne acrylic resin, combined with blocked isocyanates, compatibilizers, and stain-resistant additives, exhibits a good synergistic effect, resulting in a coating with excellent flexibility, stain resistance, and colorfastness after high-temperature storage. Furthermore, the coating possesses high hiding power and can be formulated into various colors.

[0011] This coating is suitable for PCB boards used in integrated circuits of electronic products or as a solder resist ink layer. It addresses the issue of monotonous colors on integrated circuit boards, which fails to meet consumer aesthetics for customer-facing components, necessitating further coating of various colors onto the corresponding substrates to satisfy user needs. The developed base material can be used for tinting various colors to prepare multi-color coatings. Regarding workability: this one-coat high-temperature coating material, compared to PU components in the 3C electronics field, has no activation period impact, high tolerance to color pastes, and can be matched with various color pastes. The activation period of the coating will not change due to color paste replacement.

[0012] According to some embodiments of the present invention, the pH of the water-based color coating is 7 to 9.

[0013] According to some embodiments of the present invention, the raw materials for preparing the water-based color coating also include a neutralizing agent.

[0014] According to some embodiments of the present invention, the water-based color coating comprises the following raw materials: 25-35 parts of water-based acrylic acid 1-5 parts of blocked isocyanate 3-7 parts of amino resin 1-10 parts water 0.5-8 parts of cosolvent 9-68 parts of color paste Additives: 7-18 parts.

[0015] According to some embodiments of the present invention, the neutralizing agent is 0.1 to 0.5 parts by weight, and each part represents the same mass as the other raw materials by weight.

[0016] Adding it in this proportion can improve the hardness and wear resistance of the coating and enhance the pigment carrying capacity.

[0017] According to some embodiments of the present invention, the aqueous acrylic acid is an aqueous acrylic dispersion with a hydroxyl value of 130-145 mg KOH / g and an acid value of 10-20 mg KOH / g. Using an aqueous acrylic dispersion with high hydroxyl and high acid values ​​as the resin base results in high crosslinking density after curing, good chemical resistance, and strong color bonding. This resin has strong bonding with inorganic pigments such as titanium dioxide, and can tightly coat the pigment surface. When cured with amino resins and blocked isocyanates, it can also form strong bonds with solder resist inks. Paints prepared based on this system exhibit excellent overall performance and outstanding hiding power, making them particularly suitable for light-colored coatings. Even when sprayed onto black or dark substrates, they maintain good hiding power and can be formulated to produce a wide variety of film colors.

[0018] According to some embodiments of the present invention, the compatibilizer includes TEGO. ® ) Color Aid 7066, TEGO ® Color Aid 660C or Dimensions PLW-90 are at least one of these surfactants. The surfactant is electrically neutral in aqueous solution, balancing the binding forces between the organic resin and each pigment, and preventing competitive adsorption that could lead to interfacial tension instability in the dispersed phases of the system.

[0019] According to some embodiments of the present invention, the stain-resistant additive includes polyether-modified polysiloxanes and / or amino-containing polysiloxanes.

[0020] According to some embodiments of the present invention, the stain-resistant additive includes at least one of BYK 3720, TEGO® Phobe 1500 N, or BYK 3725.

[0021] According to some embodiments of the present invention, the unblocking temperature of the blocked isocyanate is 120~150°C. Selecting a blocked isocyanate with a low unblocking temperature can reduce the baking temperature of the system in the later stages.

[0022] According to some embodiments of the present invention, the blocked isocyanate includes oxime-blocked HDI or IPDI type crosslinking agents. Using blocked HDI can improve the brittleness of hydroxyl resins, increase the crosslinking density of the coating, and enhance the chemical resistance of the system; in particular, the oleic acid resistance can be further improved, while not affecting the abrasion resistance.

[0023] According to some embodiments of the present invention, the amino resin includes at least one of partially methylated amino resin, mixed etherified amino resin, or high imino resin.

[0024] According to some embodiments of the present invention, the amino resin includes at least one of Cymel 325, Resimene HM 2608, or Resimene 717.

[0025] According to some embodiments of the present invention, the neutralizing agent includes an amine pH adjuster.

[0026] According to some embodiments of the present invention, the neutralizing agent includes at least one of dimethylethanolamine (DMEA), 2-amino-2-methyl-1-propanol (such as AMP-95), or triethylamine.

[0027] According to some embodiments of the present invention, the additives include at least one of defoamers, wetting agents, matting agents, or thickeners.

[0028] According to some embodiments of the present invention, the colorant includes at least one of white, red, or blue colorant. Other colors of colorant may also be selected for formulation as needed.

[0029] According to some embodiments of the present invention, the white paste comprises an aqueous white paste with a titanium dioxide content of 70-75%.

[0030] According to some embodiments of the present invention, the red paste comprises an aqueous red paste with a red pigment index number PR 272 and a content of 30-35%.

[0031] According to some embodiments of the present invention, the blue paste comprises an aqueous blue paste with a phthalocyanine blue content of 30-35%.

[0032] According to some embodiments of the present invention, the co-solvent includes at least one of propylene glycol butyl ether, propylene glycol methyl ether, diethylene glycol butyl ether, or dipropylene glycol methyl ether.

[0033] According to some embodiments of the present invention, the defoamer comprises polyether-modified siloxane.

[0034] According to some embodiments of the present invention, the defoamer comprises a polyether-modified siloxane with a molecular weight of 1-100 kDa. Using a defoamer with a larger molecular weight allows it to adsorb onto the surface of bubbles, disrupting the gas-liquid surface tension and rapidly breaking the bubbles.

[0035] According to some embodiments of the present invention, the defoamer includes TEGO. ® Foamex 825, TEGO ® At least one of Foamex 810 or BYK Chemical (BYK)-028.

[0036] According to some embodiments of the present invention, the wetting agent comprises a polyether-modified siloxane.

[0037] According to some embodiments of the present invention, the wetting agent comprises a polyether-modified siloxane with a molecular weight of 0.1~10kDa. The wetting agent has a small molecular weight, allowing it to quickly migrate to the newly formed interface after the coating is sprayed onto the substrate surface, thus wetting the interface.

[0038] According to some embodiments of the present invention, the wetting agent includes TEGO. ® Wet 270, TEGO ® At least one of Wet KL 245, BYK-345, or BYK-349.

[0039] According to some embodiments of the present invention, the matting agent includes at least one of Tosoh E-220A, Tosoh E-1011, Grace C803, Grace SYLOID 7000, or Evonik ACEMATT TS100.

[0040] According to some embodiments of the present invention, the thickener includes an aqueous thickener.

[0041] According to some embodiments of the present invention, the thickener comprises Vesmody from Wanhua Chemical. ® U605, Milliken Borchi ® At least one of Gel 0620, Hemings RHEOLATE 299, or RHEOLATE FX 1010.

[0042] According to some embodiments of the present invention, the water-based color coating comprises the following raw materials: 25-35 parts of water-based acrylic acid 1-5 parts of blocked isocyanate 3-7 parts of amino resin 1-10 parts water 0.5-8 parts of cosolvent 5-48 parts white paste 3-10 parts red paste 1-10 parts blue paste 2-6 parts compatibilizer Stain-resistant additive 0.5~3 parts Neutralizing agent 0.1~0.5 parts 0.1 to 2 parts of defoamer Wetting agent 0.2 to 2 parts 2-8 parts of matting agent Thickener 0.1 to 2 parts.

[0043] According to some embodiments of the present invention, the water-based color coating comprises the following raw materials: 30.8 parts of water-based acrylic acid 3 parts of blocked isocyanate 5.1 parts amino resin 1 part water 1 part of cosolvent 48 portions of white paste 3 portions of red paste 1 part blue paste 2 parts compatibilizer Stain-resistant additive 0.5~3 parts 0.1 parts neutralizer 0.1 parts defoamer 0.5 parts wetting agent 3 parts matting agent Thickener 0.4 parts.

[0044] According to another aspect of the present invention, a method for preparing the above-mentioned water-based color coating is provided, comprising the following steps: A water-based acrylic acid, a blocked isocyanate, and an amino resin are mixed to obtain a first mixture; water and a cosolvent are mixed to obtain a second mixture. The second mixture is added to the first mixture to obtain the third mixture; Adding an auxiliary agent to the third mixture yields a fourth mixture; Add colorant to the fourth mixture to obtain the water-based color coating.

[0045] According to some embodiments of the present invention, the preparation method further includes adding a neutralizing agent to the first mixture.

[0046] According to another aspect of the present invention, the application of the above-mentioned water-based color coating is proposed, specifically including a coating, wherein the raw materials for preparing the coating include the above-mentioned water-based color coating.

[0047] The single-coat material prepared using the above-mentioned water-based color coating has good wear resistance and chemical resistance.

[0048] According to some embodiments of the present invention, the substrate of the coating comprises a solder resist ink layer.

[0049] According to another aspect of the present invention, a method for preparing a coating is provided, comprising the following steps: Adjust the viscosity of the water-based color coating with water, apply it to the substrate surface, pre-bake at 60-80℃ for 5-20 minutes, and then bake at 145-160℃ for 25-35 minutes.

[0050] According to some embodiments of the present invention, the application is performed by spraying. A hand spray gun or an automatic spray gun can be used.

[0051] According to some embodiments of the present invention, the viscosity of the water-based color paint is adjusted to 9-12s (25°C, measured with a Zein 3# cup) using water.

[0052] According to some embodiments of the present invention, the substrate includes an insulating coating covering the PCB circuit board.

[0053] According to some embodiments of the present invention, the raw materials for preparing the insulating coating include solder resist ink.

[0054] According to some embodiments of the present invention, the raw materials for preparing the insulating coating include black or dark-colored solder resist ink.

[0055] According to some embodiments of the present invention, the preparation method further includes the step of adjusting the viscosity and then filtering with a 200-300 mesh filter cloth.

[0056] According to another aspect of the present invention, a PCB board is provided, wherein the raw materials for preparing the PCB board include the above-mentioned water-based color coating.

[0057] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Detailed Implementation

[0058] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the embodiments are conventional methods; the materials and reagents used, unless otherwise specified, are commercially available. Unless otherwise specified, the same parameter value is the same in all embodiments. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0059] In the description of this invention, references to terms such as "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] In the description of this invention, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0061] The sources of raw materials used in the following examples and comparative examples are explained below: Waterborne acrylic resin: KN3651W (Double bond chemistry DB3645 can also be used).

[0062] Neutralizing agent: Dow Chemical, AMP-95.

[0063] Blocked isocyanates: Covestro Bayhydur ® BL 2867 (CYMEL can also be used) ® NF 2000A).

[0064] Amino resin: Cymel 325.

[0065] Compatibilizer: The compatibilizer used in Examples 1-5 and Comparative Examples 1-5 was TEGO. ® Color Aid 660C, Comparative Example 4 uses sodium dodecylbenzenesulfonate (SDBS).

[0066] Stain-resistant additive: BYK 3720.

[0067] White paste: A water-based white paste with a titanium dioxide content of 70-75%.

[0068] Red paste: A water-based red pigment with a content of 30-35% and index number PR 272.

[0069] Blue paste: Water-based blue paste with a phthalocyanine blue content of 30-35%.

[0070] Cosolvent: Propylene glycol butyl ether.

[0071] Defoamer: TEGO Foamex 825.

[0072] Wetting agent: TEGO ® Wet 270.

[0073] Matting agent: Tosoh E-220A.

[0074] Thickener: Wanhua Chemical Vesmody ® U605.

[0075] Examples 1-5 and Comparative Examples 1-4: A water-based color coating is provided, prepared using raw materials according to the formulas in Table 1. Specifically, the preparation process is as follows: The weighed water-based acrylic acid, neutralizing agent, blocked isocyanate and amino resin are mixed in a mixer to prepare the first mixture. The weighed deionized water and solubilizer are mixed to prepare a second mixture. The second mixture is slowly added to the first mixture and mixed on a mixer to prepare the third mixture. Add the weighed defoamer, wetting agent, stain-resistant agent, matting agent and thickener to the third mixture above, and mix to prepare the fourth mixture; The weighed white paste, red paste, and blue paste were added to the fourth mixture above, and after mixing, the fifth mixture was prepared. After filtration, a water-based color coating for solder resist ink was obtained.

[0076] Table 1

[0077] The prepared water-based color paint and deionized water were added in the appropriate proportions and stirred evenly using a disperser. The viscosity of the mixture was adjusted to 10s (measured at 25℃ using a Zein 3# cup) with deionized water. After thorough mixing, the mixture was filtered through a 200-mesh filter cloth. The filtered mixture was then sprayed onto the surface of black (or other dark-colored) solder resist ink. The sprayed product was pre-baked at 70℃ for 10 minutes, and then transferred to a high-temperature oven at 150℃ for 30 minutes.

[0078] The performance test results of the coating formed after baking are shown in Table 2 below: Table 2

[0079] As can be seen from the performance test results of Examples 1 to 5 in Table 2, the coating prepared by mixing waterborne acrylate, amino resin, compatibilizer, stain-resistant additive and color paste in an appropriate proportion not only has good thermal storage stability, but also the cured paint film has good adhesion, wear resistance, oleic acid resistance, chemical resistance, high temperature and humidity resistance and thermal cycling performance.

[0080] The results from Comparative Example 1 and Examples 2 and 4 show that if only amino resin is used as a crosslinking agent, the resulting paint film has a low crosslinking density, which is insufficient to effectively block oleic acid molecules from penetrating into the paint film. Oleic acid penetration into the coating causes swelling, leading to blistering of the paint film. Furthermore, when the pigment content is high, the cured paint film exhibits hardness and brittleness, easily showing paint chipping during cross-cut adhesion testing, resulting in decreased adhesion. Under thermal shock conditions, the internal stress of the paint film changes with temperature, further damaging the coating and causing slight blistering. By combining it with a blocked isocyanate, the flexibility of the coating is improved, while the paint film still maintains good abrasion resistance. This is mainly because the addition of the blocked isocyanate further increases the crosslinking density of the system, enhancing the paint film's barrier properties against chemicals and its anti-swelling ability, thus exhibiting superior chemical resistance. Isocyanate molecules belong to an aliphatic structure, possessing good flexibility and maintaining the characteristic toughness of aliphatic polymer chains after curing with waterborne acrylic resin. In contrast, the six-membered heterocyclic aromatic structure contained in amino resin molecules gives it rigidity. During high-temperature baking, some amino resins undergo self-crosslinking, resulting in a hard and brittle paint film with poor adhesion. When blocked isocyanates are combined with amino resins and mixed with water-based acrylic resins, the prepared paint film not only has a high crosslinking density but also maintains good flexibility and abrasion resistance.

[0081] The results from Comparative Examples 2 and 4, compared with Examples 2 and 4, show that after 7 days of storage at 50°C, the color difference of the coatings prepared in Comparative Examples 2 and 4 of the water-based paints exhibited more significant changes. This is mainly attributed to the fact that the water-based paint system is essentially a mixture of various heterogeneous substances, with both phase interfaces and competitive adsorption-desorption relationships at the molecular level between the components. A stable system depends on the balance of intermolecular forces; when the external environment changes, the molecular competition between the phases intensifies, disrupting the original balance and leading to decreased stability. The addition of compatibilizers helps to restore and maintain the equilibrium stability between the phases. This is because compatibilizers can effectively reduce interfacial free energy and regulate the surface tension between different phases, thereby promoting the formation of a uniform and stable dispersion system. However, when the compatibilizer is incompatible with the system, it cannot stabilize the equilibrium of the phase interfaces in the system, potentially disrupting the competitive adsorption-desorption between the molecules of each phase, and failing to improve the color difference stability of the system after storage.

[0082] Based on the comparison results between Comparative Example 3 and Examples 1-5, the coating prepared in Comparative Example 3 exhibited blistering in the oleic acid test and severe staining in the chemical test. This was mainly due to the absence of a stain-resistant additive in the formulation, leading to increased surface tension of the dry film and facilitating the wetting and penetration of oleic acid and other chemicals onto the coating surface. The coating failed to effectively prevent the chemical media from penetrating inward, ultimately causing significant staining and blistering. However, the introduction of a stain-resistant additive into the system significantly improved the coating's stain resistance. This was primarily due to the synergistic effect between the stain-resistant additive and the highly cross-linked resin components, which jointly enhanced the coating's resistance to contaminants.

[0083] The results from Examples 1-5 show that the pigment-to-binder ratios (P / B) of Examples 1 and 5 are 2.2 and 2.1, respectively, both at a relatively high level. Although the adhesion of the coating decreased slightly at this time, the overall performance still met the standard requirements, indicating that the resin system has a strong pigment carrying capacity. In contrast, the pigment-to-binder ratios of Examples 2-4 are between 1.8 and 2.0, exhibiting the best overall performance.

[0084] Comparative examples 1-5 show that the upper limit of pigment carrying capacity of this system is approximately a pigment-to-binder ratio of 2.2; exceeding this limit may lead to a decrease in the performance of the sprayed coating. The system's excellent pigment carrying capacity is mainly attributed to the high hydroxyl and acid values ​​of the selected resin. This type of resin exhibits strong adhesion to inorganic pigments such as titanium dioxide, firmly coating the pigment surface. Furthermore, during curing with amino resins and blocked isocyanates, it forms strong bonds with solder resist inks. Paints prepared based on this system not only possess excellent performance but also good hiding power. Even light-colored paints maintain good hiding power when sprayed onto black or dark substrates, thus enabling the preparation of paint films with a wide variety of colors.

[0085] The test results of the above comparative examples and embodiments show that the combination of waterborne acrylic resin, blocked isocyanate, compatibilizer and stain-resistant additive in the system can form a good synergistic effect, giving the coating film good flexibility, stain resistance and no discoloration after high temperature storage. At the same time, the formed paint film has good hiding power and can prepare paint films of a variety of colors.

[0086] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A water-based color coating, characterized in that: The product comprises the following raw materials: waterborne acrylic acid, blocked isocyanate, amino resin, water, cosolvent, colorant, and additives. The additives include stain-resistant additives and compatibilizers. The stain-resistant additives include polysiloxanes with a molecular weight of 1 to 100 kDa. The compatibilizers include surfactants, which are electrically neutral in aqueous solution.

2. The water-based color coating according to claim 1, characterized in that: The water-based color coating comprises the following raw materials: 25-35 parts of water-based acrylic acid 1-5 parts of blocked isocyanate 3-7 parts of amino resin 1-10 parts water 0.5-8 parts of cosolvent 9-68 parts of color paste Additives: 7-18 parts.

3. The water-based color coating according to claim 1, characterized in that: The aqueous acrylic acid is an aqueous acrylic acid dispersion with a hydroxyl value of 130~145 mg KOH / g and an acid value of 10-20 mg KOH / g.

4. The water-based color coating according to claim 1, characterized in that: The stain-resistant additives include polyether-modified polysiloxanes and / or amino-containing polysiloxanes.

5. The water-based color coating according to claim 1, characterized in that: The unblocking temperature of the blocked isocyanate is 120~150℃; and / or, the blocked isocyanate includes oxime-blocked HDI or IPDI type crosslinking agents.

6. The water-based color coating according to claim 1, characterized in that: The water-based color coating comprises the following raw materials: 25-35 parts of water-based acrylic acid 1-5 parts of blocked isocyanate 3-7 parts of amino resin 1-10 parts water 0.5-8 parts of cosolvent 5-48 parts white paste 3-10 parts red paste 1-10 parts blue paste 2-6 parts compatibilizer Stain-resistant additive 0.5~3 parts Neutralizing agent 0.1~0.5 parts 0.1 to 2 parts of defoamer Wetting agent 0.2 to 2 parts 2-8 parts of matting agent Thickener 0.1 to 2 parts.

7. The method for preparing water-based color coatings according to any one of claims 1 to 6, characterized in that: Includes the following steps: A water-based acrylic acid, a blocked isocyanate, and an amino resin are mixed to obtain a first mixture; water and a cosolvent are mixed to obtain a second mixture. The second mixture is added to the first mixture to obtain the third mixture; Adding an auxiliary agent to the third mixture yields a fourth mixture; Add colorant to the fourth mixture to obtain the water-based color coating.

8. A coating, characterized in that: The raw materials for preparing the coating include the water-based color paint as described in any one of claims 1 to 6.

9. A method for preparing a coating, characterized in that: Includes the following steps: Adjust the viscosity of the water-based color coating with water, apply it to the substrate surface, pre-bake at 60-80℃ for 5-20 minutes, and then bake at 145-160℃ for 25-35 minutes.

10. A PCB board, characterized in that: The raw materials for preparing the PCB board include the water-based color coatings as described in any one of claims 1 to 6.

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