UV conformal coating and preparation method thereof

Abstract

The invention relates to a UV three-proofing paint and a preparation method thereof, and relates to the technical field of paints, the UV three-proofing paint comprises acrylic resin, epoxy resin, rosin modified alkyd resin, a drier, an antifoaming agent, butyl acetate, isopropanol, a fluorescent agent, a coupling agent, hollow glass beads, melamine formaldehyde resin-porous starch-carvacrol microcapsules and other raw materials. According to the UV three-proofing paint, through a specific formula and a preparation process, excellent waterproof, antibacterial and anti-corrosion effects are achieved, meanwhile, the UV three-proofing paint has good UV curing performance, the service life of a coating is prolonged, and the stability of the coating is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coatings, and in particular to a UV triple-proof paint and a preparation method thereof. Background Art

[0002] As technological progress promotes the popularization of electronic devices in various fields of life and industry, especially in complex and changeable usage environments, the market demand for high-performance UV conformal coatings that are waterproof, antibacterial and anticorrosive has increased sharply. Although existing UV conformal coatings have attracted much attention due to their advantages such as rapid curing and environmental friendliness, they still face the challenges of insufficient waterproofness and improvement of antibacterial and anticorrosive performance, which limits the expansion of their application range. Therefore, the research and development of a new generation of UV conformal coating technology that transcends existing limitations and has better comprehensive protection performance has become an urgent issue in the field of coating technology, aiming to meet the growing demand for high-end protection in a breakthrough way. Summary of the invention

[0003] In order to solve at least one of the above technical problems, a waterproof, antibacterial and anti-corrosion triple-proof paint is developed. The present application provides a UV triple-proof paint and a preparation method thereof.

[0004] In a first aspect, the present application provides a UV conformal paint, wherein the UV conformal paint comprises the following raw materials in parts by weight: Acrylic resin 40-55 parts; Epoxy resin 10-15 parts; 10-15 parts of rosin modified alkyd resin; 7-10 parts of drying agent; 3-5 parts of defoaming agent Butyl acetate 5-9 parts; 45-55 parts of isopropyl alcohol; 1-2 parts of fluorescent agent; 3-5 parts of coupling agent; 10-20 parts of hollow glass microspheres; 5 to 10 parts of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0005] By adopting the above technical solutions, the UV three-proof paint provided by this application comprehensively considers the multiple requirements of performance improvement and practical application, and achieves a significant upgrade of the performance of traditional three-proof paint through carefully selected raw material ratios and innovative microcapsule technology. The UV three-proof paint formula provided by this application is based on acrylic resin and epoxy resin to construct a hard chemical-resistant coating that effectively resists moisture, smoke and chemical corrosion, ensuring stable operation of equipment in harsh environments. The fusion of rosin-modified alkyd resin enhances the flexibility and sealing of the coating, and cooperates with butyl acetate and isopropyl alcohol as solvents to improve the density of the coating, effectively isolate external moisture and dust, and extend the life of electronic components. It is particularly noteworthy that melamine formaldehyde resin-porous starch-carvacrol microcapsules are added to the formula, and carvacrol is slowly released using microcapsule technology, which not only brings a lasting antibacterial effect, but also enhances chemical stability and waterproofness, further improving anti-corrosion ability. The addition of hollow glass microspheres not only reduces the weight of the coating, but also additionally enhances the waterproof properties. The application of coupling agent significantly improves the bonding strength between the coating and the substrate, ensures the uniformity and integrity of the coating, and reduces the risk of peeling, while the addition of fluorescent agent is conducive to quality monitoring during the coating process. In summary, the UV three-proof paint provided by this application effectively overcomes the limitations of existing three-proof paint technology in terms of waterproofing, antibacterial, and anti-corrosion through finely optimized raw material ratios and the application of new materials, providing a comprehensive and efficient protection solution for electronic equipment, fully meeting the market's urgent demand for high-performance protective materials, and effectively promoting technological progress and innovation in the electronic assembly industry.

[0006] Optionally, the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:(0.3-0.7).

[0007] By adopting the above technical scheme, the present application can improve the present application by precisely controlling the weight ratio of hollow glass microbeads and melamine formaldehyde resin-porous starch-carvacrol microcapsules, not only achieving significant improvements in protective properties such as waterproofing, antibacterial, and anti-corrosion, but also optimizing the physical and mechanical properties and processing properties of the coating, providing a more comprehensive and efficient protection scheme for electronic equipment, meeting the market demand for high-demand protective materials, and promoting the upgrading of electronic assembly technology.

[0008] Preferably, the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.5.

[0009] By adopting the above technical solution, when the weight ratio of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules is set to 1:0.5, this specific ratio shows significant advantages in enhancing waterproofness, antiseptic properties and antibacterial properties. Among them, the hollow glass microspheres, as lightweight fillers, have a hollow structure inside that can effectively prevent water penetration, and at the same time, their smooth surface helps water droplets roll and is not easy to adhere, thereby reducing the direct contact between water and electronic devices. When tightly combined with the coating material, these microbeads form a physical barrier that effectively blocks water intrusion and enhances the waterproof ability of the coating. In particular, the ratio of 1:0.5 ensures that the hollow glass microspheres are evenly distributed, neither too dense to affect the flexibility of the coating, nor too small to affect the waterproof effect. As an intelligent release system, the melamine formaldehyde resin-porous starch-carvacrol microcapsules can ensure that a sufficient number of microcapsules are evenly distributed in each unit volume of the coating by precisely controlling the mass, ensuring the continuous and stable release of carvacrol. Carvacrol is continuously present on the coating surface and near-surface area through the slow release mechanism of microcapsules, forming an antibacterial protective layer, effectively preventing the attachment and reproduction of microorganisms such as bacteria and fungi, and maintaining a good antibacterial effect even in a humid or microbial-friendly environment. In summary, this preferred ratio forms a synergistic effect in terms of waterproofing, corrosion resistance, and antibacterial properties. It not only prevents water intrusion through a physical barrier, but also effectively inhibits microbial activity and chemical corrosion through a chemical protection mechanism, thereby providing more comprehensive and lasting protection for electronic equipment, and is suitable for a variety of harsh application environments. Carvacrol also works together with melamine formaldehyde resin to enhance chemical stability, further improving the coating's resistance to external corrosive media, especially chemical erosion.

[0010] Optionally, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules accounts for 13.64-16.48% of the total weight of the UV conformal paint.

[0011] By adopting the above technical scheme and precisely controlling the total weight ratio of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules, this technical scheme achieves balanced optimization of UV triple-proof paint in multiple dimensions such as performance, cost, processing technology, and environmental adaptability, thereby promoting the advancement of electronic protective material technology and the expansion of its application scope.

[0012] Optionally, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules accounts for 15.08% of the total weight of the UV conformal paint.

[0013] Optionally, the method for preparing the melamine formaldehyde resin-porous starch-carvacrol microcapsules comprises the following steps: A1, mixing porous starch and carvacrol, stirring, ultrasonically dispersing, centrifuging, and washing to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine, stirring and reacting to obtain a melamine-formaldehyde resin primary polymer; A3, mixing the melamine-formaldehyde resin primary polymer and the porous starch-carvacrol microspheres, adjusting the pH to 6.0, stirring and reacting, cooling, filtering, and drying to obtain the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0014] By adopting the above technical scheme, the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared by the above technical scheme can significantly enhance the comprehensive performance of the three-proof paint, which is specifically reflected in the following aspects: In step A1, porous starch and carvacrol are combined to effectively load carvacrol using the special structure of porous starch to form microspheres. The porous structure not only increases the adsorption amount of carvacrol, but also lays the foundation for the subsequent sustained release mechanism, ensures the stable and continuous release of carvacrol, and enhances the antibacterial effect. In step A2, by precisely controlling the reaction conditions of formaldehyde and melamine (pH 8.0), the obtained melamine-formaldehyde resin primary polymer has good crosslinking degree and stability, provides a high-strength shell for the formation of microcapsules, enhances the physical protection and chemical stability of the coating, and improves the anti-corrosion ability. In step A3, the melamine-formaldehyde resin primary polymer is combined with porous starch-carvacrol microspheres, and the pH is adjusted to 6.0 for reaction to form a microcapsule structure. This process not only ensures the uniformity and integrity of the microcapsules, but also allows carvacrol to be effectively encapsulated in the resin, further protecting carvacrol from the external environment, extending its effective time, and enhancing the waterproof performance of the microcapsules. In summary, this technical solution, through sophisticated step design, not only successfully prepared melamine formaldehyde resin-porous starch-carvacrol microcapsules with high loading and sustained release characteristics, but also demonstrated significant advantages in improving the waterproof, antibacterial and anticorrosive properties of the three-proof paint, providing more comprehensive and lasting protection for electronic equipment, adapting to more complex and changeable application environments, and promoting the advancement of three-proof paint technology.

[0015] Optionally, in step A1, the weight ratio of the porous starch to carvacrol is 1:(1-3).

[0016] Optionally, the mass concentration of the formaldehyde aqueous solution is (35-37)%.

[0017] Further optionally, in step A2, the weight ratio of the formaldehyde aqueous solution to the melamine is (1.5-2.5):1.

[0018] Optionally, in step A3, the weight ratio of the melamine-formaldehyde resin primary polymer to the porous starch-carvacrol microspheres is 1:(1-5).

[0019] Optionally, the melamine formaldehyde resin-porous starch-carvacrol microcapsules are replaced with hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules; The hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsule is prepared from hexadecyltrimethoxysilane, ethanol and melamine formaldehyde resin-porous starch-carvacrol microcapsule in a weight ratio of (3-5):20:10.

[0020] By adopting the above technical solution, hexadecyltrimethoxysilane modified melamine formaldehyde resin-porous starch-carvacrol microcapsules replaced the original melamine formaldehyde resin-porous starch-carvacrol microcapsules, achieving the following performance improvements and optimizations: The introduction of hexadecyltrimethoxysilane introduces a hydrophobic long-chain structure to the surface of the microcapsule, significantly enhancing the hydrophobicity and waterproofness of the coating. This modification helps prevent moisture penetration, protect the stability of electronic equipment in a humid environment, and reduce the risk of corrosion and short circuit caused by moisture. The modified layer formed by the hexadecyl group and ethanol enhances the binding force between the microcapsule and the coating substrate, making the microcapsule more evenly distributed in the coating and not easy to fall off, thereby improving the overall stability and durability of the coating. This is particularly important for electronic devices that are subject to mechanical stress and environmental changes. The structure of the modified microcapsule may regulate the release rate of carvacrol, making the antibacterial effect more durable and stable. At the same time, the introduction of hexadecyl may also have a positive effect on the physical stability of the microcapsule, extending the shelf life of the microcapsule during storage and use. The modified microcapsule structure improves resistance to chemical substances, so that when facing chemical corrosion environments such as acid, alkali, and salt spray, the microcapsule can more effectively protect the internal carvacrol activity and maintain the anticorrosive effect of the coating. In summary, the hexadecyltrimethoxysilane modification technology not only enhances the hydrophobic and waterproof properties of the microcapsules, but also improves their bonding strength with the coating, stability and chemical corrosion resistance, providing more comprehensive and long-term protection measures for electronic equipment, meeting the needs of high-demand protection applications, and promoting the further development of electronic assembly technology.

[0021] Optionally, the drier is selected from zirconium drier.

[0022] Optionally, the coupling agent is selected from titanate coupling agent.

[0023] In a second aspect, the present application provides a method for preparing a UV conformal coating, the method comprising the following steps: adding acrylic resin, epoxy resin, rosin-modified alkyd resin, and hollow glass microspheres to isopropyl alcohol and stirring evenly, then adding the remaining raw materials and stirring to obtain the UV conformal coating.

[0024] Optionally, the preparation method comprises the following steps: First, pour isopropanol into a reaction kettle, then add acrylic resin, epoxy resin, rosin-modified alkyd resin, and hollow glass microspheres, heat to 80-90° C., stir at a speed of 300-500 r / min for 1-2 hours, then cool to 30-45° C., add the remaining raw materials into the reaction kettle, stir at a speed of 300-400 r / min for 0.5-1 hour, and obtain the UV triple-proof paint.

[0025] By adopting the above technical scheme, the UV three-proof paint preparation method of the present application realizes the preparation of high-performance three-proof paint under the reaction conditions of ensuring efficient, uniform mixing and control, which is specifically reflected in the following advantages: First, most of the solid raw materials are added under low temperature conditions (80-90°C), which is conducive to the gradual dissolution of the resin and additives, avoiding uneven reaction or raw material decomposition caused by local overheating. Then cool down to 30-45°C and add the remaining raw materials, especially temperature-sensitive components such as coupling agents, fluorescent initiators, etc., to effectively protect their activity and ensure the smooth progress of subsequent reactions. In the early stage of the reaction, a higher speed (300-500r / min) is used for stirring, which helps to quickly disperse and accelerate the dissolution of the resin, and promotes the initial mixing of materials to ensure that there is no obvious agglomeration. Later, it was reduced to 300-400r / min, and the gentler stirring rate was conducive to fine mixing, especially when adding remaining fragile materials such as microcapsules and fluorescent sensitive substances, reducing shear force damage and maintaining its structural integrity. Careful control of temperature and time throughout the process ensures the full progress of each step of the reaction while avoiding unnecessary side reactions. The first 1-2 hours of high-temperature stirring allows the resin to fully cross-link and form a stable matrix; the subsequent 0.5 to 1 hour of low-temperature stirring is the fine-tuning stage to ensure the uniform dispersion and stable combination of the newly added materials, especially the full effect of the coupling agent, which enhances the bonding between the coating and the substrate. In summary, the preparation method of the present application not only optimizes the mixing and reaction efficiency of the materials, but also protects the activity of sensitive components through refined temperature, stirring rate and time control. The final UV three-proof paint exhibits better performance, including but not limited to enhanced waterproof, antibacterial, and anti-corrosion capabilities, as well as good mechanical properties and surface finish, which meets the strict requirements of the high-end electronic assembly industry for protective materials and promotes the innovation and application of three-proof paint technology.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The UV three-proof paint provided in this application takes into account the multiple requirements of performance improvement and practical application, and achieves a significant upgrade of the performance of traditional three-proof paint through carefully selected raw material ratios and innovative microcapsule technology. The UV three-proof paint formula provided in this application is based on acrylic resin and epoxy resin to construct a hard chemical-resistant coating that effectively resists moisture, smoke and chemical corrosion, ensuring stable operation of equipment in harsh environments. The fusion of rosin-modified alkyd resin enhances the flexibility and sealing of the coating, and cooperates with butyl acetate and isopropyl alcohol as solvents to improve the density of the coating, effectively isolate external moisture and dust, and extend the life of electronic components. It is particularly noteworthy that melamine formaldehyde resin-porous starch-carvacrol microcapsules are added to the formula, and microcapsule technology is used to slowly release carvacrol, which not only brings a lasting antibacterial effect, but also enhances chemical stability and waterproofness, and further improves anti-corrosion ability. The addition of hollow glass microspheres not only reduces the weight of the coating, but also additionally enhances the waterproof properties. The application of coupling agent significantly improves the bonding strength between the coating and the substrate, ensures the uniformity and integrity of the coating, and reduces the risk of peeling, while the addition of fluorescent agent is conducive to quality monitoring during the coating process. In summary, the UV three-proof paint provided by this application effectively overcomes the limitations of existing three-proof paint technology in terms of waterproofing, antibacterial, and anti-corrosion through finely optimized raw material ratios and the application of new materials, providing a comprehensive and efficient protection solution for electronic equipment, fully meeting the market's urgent demand for high-performance protective materials, and effectively promoting technological progress and innovation in the electronic assembly industry.

[0027] 2. In the present invention, melamine formaldehyde resin-porous starch-carvacrol microcapsules are preferably used. Due to their unique microcapsule structure, the protective performance and stability of the coating are further improved.

[0028] 3. Hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules replaced the original melamine formaldehyde resin-porous starch-carvacrol microcapsules, achieving the following performance improvements and optimizations: The introduction of hexadecyltrimethoxysilane introduced a hydrophobic long-chain structure to the surface of the microcapsules, significantly enhancing the hydrophobicity and waterproofness of the coating. This modification helps prevent moisture penetration, protect the stability of electronic equipment in a humid environment, and reduce the risk of corrosion and short circuits caused by moisture. The modified layer formed by the hexadecyl group and ethanol enhances the binding force between the microcapsules and the coating substrate, making the microcapsules more evenly distributed in the coating and not easy to fall off, thereby improving the overall stability and durability of the coating. This is particularly important for electronic devices that are subject to mechanical stress and environmental changes. The structure of the modified microcapsules may regulate the release rate of carvacrol, making the antibacterial effect more durable and stable. At the same time, the introduction of hexadecyl groups may also have a positive effect on the physical stability of the microcapsules, extending the shelf life of the microcapsules during storage and use. The modified microcapsule structure improves resistance to chemical substances, so that when facing chemical corrosion environments such as acid, alkali, and salt spray, the microcapsules can more effectively protect the internal carvacrol activity and maintain the anti-corrosion effect of the coating. In summary, the use of hexadecyltrimethoxysilane modification technology not only enhances the hydrophobic and waterproof properties of the microcapsules, but also improves its bonding strength, stability, and chemical corrosion resistance with the coating, providing a more comprehensive and long-term protection measure for electronic equipment, meeting the high-demand protection application needs, and promoting the further development of electronic assembly technology.

[0029] 4. The UV conformal coating preparation method of the present application realizes the preparation of high-performance conformal coating under reaction conditions that ensure efficient, uniform mixing and control, which is specifically reflected in the following advantages: First, most of the solid raw materials are added under low temperature conditions (80-90°C), which is conducive to the gradual dissolution of the resin and additives, avoiding uneven reaction or raw material decomposition caused by local overheating. Then the temperature is lowered to 30-45°C before adding the remaining raw materials, especially temperature-sensitive components such as coupling agents, fluorescent initiators, etc., to effectively protect their activity and ensure the smooth progress of subsequent reactions. In the early stage of the reaction, a higher speed (300-500r / min) is used for stirring, which helps to quickly disperse and accelerate the dissolution of the resin, and promotes the initial mixing of materials to ensure that there is no obvious agglomeration. Later, it was reduced to 300-400r / min, and the gentler stirring rate was conducive to fine mixing, especially when adding remaining fragile materials such as microcapsules and fluorescent sensitive substances, reducing shear force damage and maintaining its structural integrity. Careful control of temperature and time throughout the process ensures that each step of the reaction is fully carried out while avoiding unnecessary side reactions. The first 1-2 hours of high-temperature stirring allows the resin to fully cross-link and form a stable matrix; the subsequent 0.5 to 1 hour of low-temperature stirring is the fine-tuning stage to ensure the uniform dispersion and stable combination of the newly added materials, especially the full effect of the coupling agent, which enhances the bonding between the coating and the substrate. In summary, the preparation method of the present application not only optimizes the mixing and reaction efficiency of the materials, but also protects the activity of sensitive components through refined temperature, stirring rate and time control. The final UV three-proof paint exhibits better performance, including but not limited to enhanced waterproof, dustproof, and corrosion resistance, as well as good mechanical properties and surface finish, which meets the strict requirements of the high-end electronic assembly industry for protective materials and promotes the innovation and application of three-proof paint technology. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the embodiments.

[0031] Acrylic resin: Qingdao Yufengda Fine Chemical Co., Ltd., CAS No. 9003-01-4.

[0032] Epoxy resin: Langfang Yushi Anticorrosion Materials Co., Ltd., model 6101.

[0033] Rosin modified alkyd resin: Guangde Bades Chemical Co., Ltd., solid content is 70±2.

[0034] Zirconium drier: Guangzhou Si Tu Yuan Chemical Co., Ltd., VOK-Zirconium 12.

[0035] BYK-066N defoamer: Shanghai Mengdihu Industrial Co., Ltd., model BYK-066N.

[0036] Butyl acetate: CAS No. 123-86-4, purity 99%.

[0037] Isopropyl alcohol: CAS No. 67-63-0, purity 99%.

[0038] Fluorescent agent: CAS No. 7128-64-5, purity 99%.

[0039] Titanate coupling agent: CAS No. 109037-78-7, purity 99%.

[0040] Hollow glass microspheres: Hebei Huishun Mining Co., Ltd., purity 99%.

[0041] Melamine: CAS No. 108-78-1, purity 99%.

[0042] Formaldehyde: CAS No. 50-00-0, purity 99%.

[0043] Porous starch: Shaanxi Bolin Biotechnology Co., Ltd., purity 99%.

[0044] Carvacrol: CAS No. 499-75-2, purity 99%.

[0045] Hexadecyltrimethoxysilane: CAS No. 16415-12-6, purity 99%.

[0046] Preparation Example 1 This preparation example provides a melamine formaldehyde resin-porous starch-carvacrol microcapsule, and the preparation method comprises the following steps: A1. Porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 25 min, ultrasonically dispersed for 25 min, centrifuged for 30 min, and washed (washed 3 times with anhydrous ethanol) to obtain porous starch-carvacrol microspheres; A2. Adjust the pH of the formaldehyde aqueous solution to 8.0, add melamine and mix with stirring, and raise the temperature to 70°C for reaction for 0.5h to obtain melamine-formaldehyde resin primary polymer; the weight ratio of the formaldehyde aqueous solution to melamine in this step is 1.5:1; A3. Mix the melamine-formaldehyde resin primary polymer obtained in step A2 and the porous starch-carvacrol microspheres obtained in step A1 in a weight ratio of 1:1, adjust the pH to 6.0, stir and raise the temperature to 85°C for reaction for 2h, cool, filter, and dry to obtain melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0047] The mass concentration of the formaldehyde aqueous solution is 35%.

[0048] Preparation Example 2 The difference between this preparation example and preparation example 1 is that the preparation method comprises the following steps: A1. The porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 min, ultrasonically dispersed for 30 min, centrifuged for 34 min, and washed (washed 3 times with anhydrous ethanol) to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine and stirring, and raising the temperature to 70°C, reacting for 0.5h, to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of the formaldehyde aqueous solution to melamine is 2:1; A3. Mix the melamine-formaldehyde resin prepolymer prepared in step A2 and the porous starch-carvacrol microspheres prepared in step A1 in a weight ratio of 1:3, adjust the pH to 6.0, stir and raise the temperature to 85°C, react for 2.5 hours, cool, filter and dry to obtain melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0049] The mass concentration of the formaldehyde aqueous solution is 36%.

[0050] Preparation Example 3 The difference between this preparation example and preparation example 1 is that the preparation method comprises the following steps: A1. The porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 35 minutes, ultrasonically dispersed for 35 minutes, centrifuged for 35 minutes, and washed to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine and mixing, and raising the temperature to 70°C, reacting for 0.5h, to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of the formaldehyde aqueous solution to melamine is 2.5:1; A3. Mix the melamine-formaldehyde resin prepolymer obtained in step A2 and the porous starch-carvacrol microspheres obtained in step A1 in a weight ratio of 1:5, adjust the pH to 6.0, stir and raise the temperature to 85° C., react for 3 hours, cool, filter, and dry to obtain the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0051] The mass concentration of the formaldehyde aqueous solution is 37%.

[0052] Preparation Example 4 The difference between this preparation example and preparation example 2 is that the preparation method comprises the following steps: A1. The porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 min, ultrasonically dispersed for 30 min, centrifuged for 34 min, and washed (washed 3 times with anhydrous ethanol) to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine and stirring, and raising the temperature to 70°C, reacting for 0.5h, to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of formaldehyde to melamine is 2:1; A3, the melamine-formaldehyde resin prepolymer prepared in step A2 and the porous starch-carvacrol microspheres prepared in step A1 were mixed in a weight ratio of 1:3, the pH was adjusted to 6.0, the mixture was stirred and the temperature was raised to 85°C, the reaction was carried out for 2.5 hours, the mixture was cooled, filtered and dried to obtain melamine formaldehyde resin-porous starch-carvacrol microcapsules; A4. Dissolve hexadecyltrimethoxysilane in ethanol, add the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in step A3, and soak for 2 hours to obtain hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules. In this step, the weight ratio of hexadecyltrimethoxysilane, ethanol and melamine formaldehyde resin-porous starch-carvacrol microcapsules is 3:20:10.

[0053] Preparation Example 5 The difference between this preparation example and preparation example 2 is that the preparation method comprises the following steps: A1. The porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 min, ultrasonically dispersed for 30 min, centrifuged for 34 min, and washed (washed 3 times with anhydrous ethanol) to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine and stirring, and raising the temperature to 70°C, reacting for 0.5h, to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of formaldehyde to melamine is 2:1; A3, the melamine-formaldehyde resin prepolymer prepared in step A2 and the porous starch-carvacrol microspheres prepared in step A1 were mixed in a weight ratio of 1:3, the pH was adjusted to 6.0, the mixture was stirred and the temperature was raised to 85°C, the reaction was carried out for 2.5 hours, the mixture was cooled, filtered and dried to obtain melamine formaldehyde resin-porous starch-carvacrol microcapsules; A4. Dissolve hexadecyltrimethoxysilane in ethanol, add the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in step A3, and soak for 2 hours to obtain hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules. In this step, the weight ratio of hexadecyltrimethoxysilane, ethanol and melamine formaldehyde resin-porous starch-carvacrol microcapsules is 4:20:10.

[0054] Preparation Example 6 The difference between this preparation example and preparation example 2 is that the preparation method comprises the following steps: A1. The porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 min, ultrasonically dispersed for 30 min, centrifuged for 34 min, and washed (washed 3 times with anhydrous ethanol) to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine and stirring, and raising the temperature to 70°C, reacting for 0.5h, to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of formaldehyde to melamine is 2:1; A3, the melamine-formaldehyde resin prepolymer prepared in step A2 and the porous starch-carvacrol microspheres prepared in step A1 were mixed in a weight ratio of 1:3, the pH was adjusted to 6.0, the mixture was stirred and the temperature was raised to 85°C, the reaction was carried out for 2.5 hours, the mixture was cooled, filtered and dried to obtain melamine formaldehyde resin-porous starch-carvacrol microcapsules; A4. Dissolve hexadecyltrimethoxysilane in ethanol, add the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in step A3, and soak for 2 hours to obtain hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules. In this step, the weight ratio of hexadecyltrimethoxysilane, ethanol and melamine formaldehyde resin-porous starch-carvacrol microcapsules is 5:20:10.

[0055] Example 1 The present embodiment provides a UV conformal paint, comprising the following raw materials: 40 parts of acrylic resin; 10 parts of epoxy resin; 10 parts of rosin-modified alkyd resin; 7 parts of drying agent; 3 parts of defoaming agent; 5 parts of butyl acetate; 45 parts of isopropyl alcohol; 1 part of fluorescent agent; 3 parts of coupling agent; 16 parts of hollow glass microspheres; and 8 parts of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0056] The method for preparing UV conformal coating in this embodiment comprises the following steps: First, pour isopropanol into the reactor, then add acrylic resin, epoxy resin, rosin-modified alkyd resin, and hollow glass microspheres, heat to 90°C, stir at 400r / min for 2h, then cool to 40°C, add the remaining raw materials to the reactor, and stir at 300r / min for 1h to obtain the UV triple-proof paint.

[0057] The drier in this embodiment is selected from zirconium drier.

[0058] The defoamer in this embodiment is selected from BYK-066N defoamer.

[0059] The coupling agent in this embodiment is selected from titanate coupling agent.

[0060] The melamine formaldehyde resin-porous starch-carvacrol microcapsules in this example are prepared by Preparation Example 1.

[0061] Embodiment 2-4 Example 2 The difference between this embodiment and embodiment 1 is that when preparing the UV conformal paint, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 24 parts, and the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.3.

[0062] Example 3 The difference between this embodiment and embodiment 1 is that when preparing the UV conformal paint, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 24 parts, and the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.6.

[0063] Example 4 The difference between this embodiment and embodiment 1 is that when preparing the UV conformal paint, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 24 parts, and the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.7.

[0064] Comparative Examples 1-3 Comparative Example 1 The difference between this comparative example and Example 3 is that hollow glass microspheres are not added when preparing the UV triple-proof paint.

[0065] Comparative Example 2 The difference between this comparative example and Example 1 is that no melamine formaldehyde resin-porous starch-carvacrol microcapsules are added when preparing the UV conformal paint.

[0066] Comparative Example 3 The difference between this comparative example and Example 1 is that, when preparing the UV conformal coating, no melamine formaldehyde resin-porous starch-carvacrol microcapsules and hollow glass microspheres were added.

[0067] Comparative Example 4 The difference between the comparative example and Example 1 is that, when preparing the UV conformal paint, an equal amount of carvacrol is used to replace the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0068] Experimental testing: Antibacterial performance: Antibacterial performance is tested in accordance with IPC-TM-650 2.6.1.

[0069] Anticorrosion performance: The anticorrosion performance of the UV triple-proof paints prepared in the examples of the present application and the comparative examples was tested according to the method of IPC-TM-650-2.6.15. The results are shown in Table 1.

[0070] Substrate adhesion: tested using GB / T92861998.

[0071] Anti-smoke: Salt spray resistance test: GB / T2423.172008 is used for testing.

[0072] The experimental test results of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1.

[0073] Table 1 - Experimental test results of Examples 1-4 and Comparative Examples 1-3 Example Antibacterial performance (level) Anti-corrosion properties Adhesion Anti-smoke performance (h) standard 0 No corrosion Level 0 100h Example 1 0 No corrosion Level 0 119 Example 2 0 No corrosion Level 0 110 Example 3 0 No corrosion Level 0 115 Example 4 0 No corrosion Level 0 113 Comparative Example 1 0 No corrosion Level 1 82 Comparative Example 2 3 Severe corrosion Level 0 88 Comparative Example 3 3 Severe corrosion Level 1 78 Comparative Example 4 2 Severe corrosion Level 0 93 Result analysis: The experimental results show that when the weight ratio of hollow glass microspheres to melamine formaldehyde resin-porous starch-carvacrol microcapsules in Examples 2 to 4 is adjusted, especially when the specific ratio of 1:0.5 is reached, the resulting UV three-proof paint exhibits excellent antibacterial, anti-corrosion and anti-smog properties. The superiority of this optimized configuration is confirmed by the data in Table 1, highlighting the key role of formula balance in enhancing protective efficacy. Comparative analysis shows that comparative example 1 removes hollow glass microspheres, comparative example 2 excludes melamine formaldehyde resin-porous starch-carvacrol microcapsules, and comparative example 3 lacks both ingredients. These adjustments all lead to a decrease in protective performance. These comparative experiments strongly support the indispensability of the composite system of hollow glass microspheres and microencapsulated carvacrol in improving the overall performance of UV three-proof paint. More importantly, comparative example 4 directly adds non-microencapsulated carvacrol to replace the microcapsule form. Although a certain degree of antibacterial activity is observed, it cannot achieve a stable antibacterial effect comparable to microencapsulation technology. The direct application of carvacrol leads to fluctuations in antibacterial effect due to its easy volatilization, which reveals the limitations of its application in UV three-proof paint. Therefore, the use of microencapsulation technology to encapsulate carvacrol not only effectively promotes the uniform distribution of carvacrol in the coating, but also significantly enhances its sustainability and stability as an antibacterial agent, overcomes the drawbacks of traditional addition methods, and provides a scientific basis for the advancement of UV three-proof paint technology.

[0074] Embodiment 5-6 Example 5 The difference between this embodiment and embodiment 3 is that when preparing the UV triple-proof paint, the weight percentages of some components are changed. The differences are shown in Table 2.

[0075] Table 2 - Differences between Example 5-6 and Example 3 Ingredients (portions) Example 1 Example 5 Example 6 Acrylic resin 40 50 55 Epoxy resin 10 13 15 Rosin modified alkyd resin 10 14 15 Drier 7 9 10 Defoaming agent 3 4 5 Butyl acetate 5 7 9 Isopropyl alcohol 45 49 55 Fluorescent agent 1 1.5 2 Coupling agent 3 4.5 5 Hollow glass microspheres 16 16 16 Melamine formaldehyde resin-porous starch-carvacrol microcapsules 8 8 8 The experimental test results of Examples 5-6 are shown in Table 3.

[0076] Table 3 - Experimental test results of Examples 5-6 Result analysis: The difference between Example 5-6 and Example 3 is that when preparing the UV three-proof paint, the weight proportions of some components are different. Combined with the experimental test results in Table 3, it can be seen that the comprehensive performance of the UV three-proof paint prepared by Example 5 is better.

[0077] Embodiment 7-11 Example 7 The difference between Example 7-11 and Example 5 is that when preparing UV conformal paint, based on the premise that the weight ratio of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.5, the total weight ratio of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV conformal paint is changed, and a better weight ratio is selected.

[0078] In Example 5, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 24 parts, and the total weight of the UV three-proof paint is 176 parts.

[0079] Therefore, it is not difficult to conclude that in Example 5, the proportion of hollow glass microspheres (referred to as variable 1) and melamine formaldehyde resin-porous starch-carvacrol microcapsules (referred to as variable 2) in the UV three-proof paint (referred to as the matrix) is 13.64%.

[0080] The differences between Examples 7-11 and Example 5 are shown in Table 4.

[0081] Proportion = (variable 1 + variable 2) / total weight of matrix * 100%.

[0082] Table 4 - Differences between Examples 7-11 and Example 5 The experimental test results of Examples 7-11 are shown in Table 5.

[0083] Table 5 - Experimental test results of Examples 7-11 Result analysis: The difference between Example 7-11 and Example 5 is that when preparing UV three-proof paint, the total weight of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV three-proof paint has different proportions. Combined with the experimental test results in Table 5, it can be seen that when the total weight of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV three-proof paint accounts for 13.64-16.48%, the comprehensive performance of the prepared UV three-proof paint is better, and when the total weight of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV three-proof paint accounts for 15.08%, the comprehensive performance of the prepared UV three-proof paint is the best. When the proportion is too high or too low, the comprehensive performance will decrease.

[0084] Examples 12-16 Example 12 The difference between this embodiment and embodiment 10 is that when preparing the UV conformal coating, the preparation parameters of the melamine formaldehyde resin-porous starch-carvacrol microcapsules used are different. The melamine formaldehyde resin-porous starch-carvacrol microcapsules in this embodiment are prepared by Preparation Example 2.

[0085] Example 13 The difference between this embodiment and embodiment 10 is that when preparing the UV conformal coating, the preparation parameters of the melamine formaldehyde resin-porous starch-carvacrol microcapsules used are different. The melamine formaldehyde resin-porous starch-carvacrol microcapsules in this embodiment are prepared by Preparation Example 3.

[0086] Embodiment 14 The difference between this embodiment and embodiment 12 is that, when preparing the UV conformal coating, an equal amount of hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in Preparation Example 4 are used instead of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0087] Embodiment 15 The difference between this embodiment and embodiment 12 is that, when preparing the UV conformal coating, an equal amount of hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in Preparation Example 5 are used instead of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0088] Example 16 The difference between this embodiment and embodiment 12 is that, when preparing the UV conformal coating, an equal amount of hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in Preparation Example 6 are used instead of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0089] The experimental test results of Examples 12-16 are shown in Table 6.

[0090] Table 6 - Experimental test results of Examples 12-16 Result analysis: The difference between Example 12-13 and Example 10 is that different preparation parameters of melamine formaldehyde resin-porous starch-carvacrol microcapsules are used in preparing UV conformal coating. Combined with the experimental test results in Table 6, it can be seen that the comprehensive performance of UV conformal coating prepared by Example 12 is better.

[0091] The difference between Examples 14-16 and Example 12 is that, when preparing the UV conformal paint, an equal amount of hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules are used instead of melamine formaldehyde resin-porous starch-carvacrol microcapsules. Combined with the experimental test results in Table 6, it can be seen that the use of an equal amount of hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules instead of melamine formaldehyde resin-porous starch-carvacrol microcapsules can further improve the anti-smoke performance of the prepared UV conformal paint.

[0092] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A UV conformal paint, characterized in that: The UV conformal paint comprises the following raw materials by weight: Acrylic resin 40-55 parts; Epoxy resin 10-15 parts; 10-15 parts of rosin modified alkyd resin; 7-10 parts of drying agent; 3~5 parts of defoamer Butyl acetate 5-9 parts; 45-55 parts of isopropyl alcohol; 1~2 parts of fluorescent agent; 3~5 parts of coupling agent; 10-20 parts of hollow glass microspheres; 5-10 parts of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

2. The UV conformal paint according to claim 1, characterized in that: The weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:(0.3-0.7).

3. The UV conformal paint according to claim 2, characterized in that: The weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.

5.

4. The UV conformal paint according to claim 1, characterized in that: The total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules accounts for 13.64-16.48% of the total weight of the UV three-proof paint.

5. The UV conformal paint according to claim 4, characterized in that: The total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules accounts for 15.08% of the total weight of the UV three-proof paint.

6. A UV conformal paint according to any one of claim 1, characterized in that: The preparation method of the melamine formaldehyde resin-porous starch-carvacrol microcapsules comprises the following steps: A1, porous starch and carvacrol are mixed, stirred, ultrasonically dispersed, centrifuged, and washed to obtain porous starch-carvacrol microspheres; A2, adjusting the pH of the formaldehyde aqueous solution to 8.0, adding melamine, stirring and reacting to obtain a melamine-formaldehyde resin primary polymer; A3, mixing the melamine-formaldehyde resin primary polymer and the porous starch-carvacrol microspheres, adjusting the pH to 6.0, stirring and reacting, cooling, filtering, and drying to obtain the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

7. The UV conformal paint according to claim 1, characterized in that: replacing the melamine formaldehyde resin-porous starch-carvacrol microcapsules with hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules; The hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules are prepared from hexadecyltrimethoxysilane, ethanol and melamine formaldehyde resin-porous starch-carvacrol microcapsules in a weight ratio of (3-5):20:

10.

8. The UV conformal paint according to claim 1, characterized in that: The drier is selected from zirconium drier.

9. The UV conformal paint according to claim 1, characterized in that: The coupling agent is selected from titanate coupling agents.

10. A method for preparing a UV conformal coating according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: Acrylic resin, epoxy resin, rosin-modified alkyd resin and hollow glass microspheres are added to isopropyl alcohol and stirred evenly, and then the remaining raw materials are added and stirred to obtain the UV three-proof paint.

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