A kind of UV triple-proof paint and preparation method thereof

Abstract

This application relates to a UV conformal coating and its preparation method, which is related to the field of coating technology. The coating comprises raw materials such as acrylic resin, epoxy resin, rosin-modified alkyd resin, drier, defoamer, butyl acetate, isopropyl alcohol, fluorescent agent, coupling agent, hollow glass microspheres, and melamine-formaldehyde resin-porous starch-carvacrol microcapsules. Through a specific formulation and preparation process, the UV conformal coating achieves excellent waterproofing, antibacterial, and anticorrosion properties, while also exhibiting good UV curing properties, which increases the coating's service life and stability.

Description

Technical Field

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

[0002] As technological advancements drive the widespread adoption of electronic devices across various sectors of life and industry, especially in complex and ever-changing environments, market demand is surging for high-performance UV conformal coatings that combine waterproofing, antibacterial properties, and corrosion resistance. While existing UV conformal coatings have attracted significant attention for their rapid curing and environmentally friendly properties, they still face challenges in achieving adequate waterproofing and antibacterial and anticorrosive properties, limiting their expanded application. Therefore, developing a new generation of UV conformal coatings that transcend these limitations and offer superior comprehensive protection has become a pressing challenge in the coatings industry, aiming to meet the growing demand for high-end protection solutions. 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:

[0005] 40-55 parts of acrylic resin;

[0006] 10-15 parts of epoxy resin;

[0007] 10-15 parts of rosin-modified alkyd resin;

[0008] 7-10 parts of drying agent;

[0009] 3-5 parts defoaming agent

[0010] 5-9 parts of butyl acetate;

[0011] 45-55 parts of isopropyl alcohol;

[0012] 1-2 parts of fluorescent agent;

[0013] 3-5 parts of coupling agent;

[0014] 10-20 parts of hollow glass microspheres;

[0015] 5 to 10 parts of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0016] By adopting the above-mentioned technical solutions, the UV conformal coating provided by this application comprehensively considers the multiple requirements of performance improvement and practical application. Through carefully selected raw material ratios and innovative microencapsulation technology, it achieves a significant upgrade in the performance of traditional conformal coatings. The UV conformal coating formula provided by this application is based on acrylic resin and epoxy resin to construct a hard and chemical-resistant coating that effectively resists moisture, smoke and chemical corrosion, ensuring stable operation of equipment in harsh environments. The incorporation of rosin-modified alkyd resin enhances the flexibility and sealing properties of the coating. The synergistic use of butyl acetate and isopropyl alcohol as solvents increases the density of the coating, effectively isolating external moisture and dust, and extending the life of electronic components. Particularly noteworthy is the addition of melamine formaldehyde resin-porous starch-carvacrol microcapsules to the formula. The microencapsulation technology is used to slowly release carvacrol, which not only provides a long-lasting antibacterial effect, but also enhances chemical stability and water resistance, further improving corrosion resistance. The addition of hollow glass microspheres not only reduces the weight of the coating but also further enhances its water resistance. The application of coupling agents 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 agents facilitates quality monitoring during the coating process. In summary, the UV conformal coating provided by this application effectively overcomes the limitations of existing conformal coating technologies in terms of waterproofing, antibacterial properties, and corrosion resistance through finely optimized raw material ratios and the application of new materials. It provides a comprehensive and efficient protection solution for electronic equipment, fully meets the market's urgent demand for high-performance protective materials, and effectively promotes technological progress and innovation in the electronics assembly industry.

[0017] Optionally, the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:(0.3-0.7).

[0018] By adopting the above technical solution, the present application can improve the protection performance such as waterproofing, antibacterial and anti-corrosion by precisely controlling the weight ratio of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules, and also optimize the physical and mechanical properties and processing performance of the coating, providing a more comprehensive and efficient protection solution for electronic equipment, meeting the market demand for high-demand protective materials, and promoting the upgrading of electronic assembly technology.

[0019] Preferably, the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is 1:0.5.

[0020] By adopting the above technical solution, when the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-porous starch-carvacrol microcapsules is set at 1:0.5, this specific ratio demonstrates significant advantages in enhancing water resistance, corrosion resistance, and antibacterial properties. The hollow glass microspheres, as lightweight fillers, effectively prevent water penetration due to their hollow structure. Their smooth surface helps water droplets roll off and resists adhesion, thereby reducing direct contact between water and electronic devices. When tightly bonded to the coating material, the microspheres form a physical barrier, effectively blocking water intrusion and enhancing the coating's water resistance. In particular, the 1:0.5 ratio ensures uniform distribution of the hollow glass microspheres, neither overly dense, which would affect the coating's flexibility, nor underlying it, which would compromise its water resistance. The melamine formaldehyde resin-porous starch-carvacrol microcapsules, acting as an intelligent release system, precisely control their mass to ensure a sufficient and even distribution of microcapsules per unit volume of the coating, ensuring the sustained and stable release of carvacrol. Carvacrol is slowly released through the microcapsule mechanism and persists on the coating surface and near-surface areas, forming an antibacterial protective layer that effectively prevents the attachment and reproduction of microorganisms such as bacteria and fungi, and maintains a good antibacterial effect even in humid or microbial-friendly environments. 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, 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.

[0021] Optionally, the total weight of the hollow glass microspheres and the melamine formaldehyde resin-porous starch-carvacrol microcapsules accounts for 13.64 to 16.48% of the total weight of the UV conformal coating.

[0022] By adopting the above technical solution and precisely controlling the total weight ratio of hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules, this technical solution achieves balanced optimization of UV triple-proof paint in multiple dimensions such as performance, cost, processing technology, and environmental adaptability, promoting the advancement of electronic protective material technology and the expansion of its application scope.

[0023] 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 coating.

[0024] Optionally, the preparation method of 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;

[0025] 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;

[0026] 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.

[0027] By adopting the above technical solution, the melamine-formaldehyde resin-porous starch-carvacrol microcapsules prepared by the above technical solution can significantly enhance the comprehensive performance of the three-proof coating, which is specifically reflected in the following aspects: In step A1, the porous starch and carvacrol are combined, and the unique structure of the porous starch is utilized to effectively load the carvacrol to form microspheres. The porous structure not only increases the adsorption capacity of carvacrol but also lays the foundation for the subsequent sustained-release mechanism, ensuring the stable and sustained release of carvacrol and enhancing the antibacterial effect. In step A2, by precisely controlling the reaction conditions of formaldehyde and melamine (pH 8.0), the resulting melamine-formaldehyde resin primary polymer has a good degree of crosslinking and stability, providing a high-strength shell for the formation of microcapsules, enhancing the physical protection and chemical stability of the coating, and improving the anti-corrosion ability. In step A3, the melamine-formaldehyde resin primary polymer is combined with porous starch-carvacrol microspheres and reacted by adjusting the pH to 6.0 to form a microcapsule structure. This process not only ensures the uniformity and integrity of the microcapsules, but also effectively encapsulates the carvacrol within the resin, further protecting it from the external environment, extending its effective duration, and enhancing the water resistance of the microcapsules. In summary, this technical solution, through meticulous step design, not only successfully prepares melamine-formaldehyde resin-porous starch-carvacrol microcapsules with high loading capacity and sustained release properties, but also demonstrates significant advantages in improving the waterproof, antibacterial, and anticorrosive properties of the three-proof coating, providing more comprehensive and long-lasting protection for electronic devices, adapting to more complex and changing application environments, and promoting the advancement of three-proof coating technology.

[0028] Optionally, in step A1, the weight ratio of the porous starch to carvacrol is 1:(1-3).

[0029] Optionally, the mass concentration of the formaldehyde aqueous solution is (35-37)%.

[0030] Further optionally, in step A2, the weight ratio of the formaldehyde aqueous solution to the melamine is (1.5-2.5):1.

[0031] Optionally, in step A3, the weight ratio of the melamine-formaldehyde resin primary polymer to the porous starch-carvacrol microspheres is 1:(1-5).

[0032] Optionally, hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules are used instead of the melamine formaldehyde resin-porous starch-carvacrol microcapsules;

[0033] 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.

[0034] 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:

[0035] The introduction of hexadecyltrimethoxysilane imparts a hydrophobic long-chain structure to the microcapsule surface, significantly enhancing the coating's hydrophobicity and water-repellency. This modification helps prevent moisture penetration, protects the stability of electronic devices in humid environments, and reduces the risk of moisture-induced corrosion and short circuits. The modified layer formed by the hexadecyl groups and ethanol strengthens the adhesion between the microcapsules and the coating substrate, ensuring a more uniform distribution of the microcapsules within the coating and preventing them from falling off, thereby improving the overall stability and durability of the coating. This is particularly important for electronic devices subjected to mechanical stress and environmental fluctuations. The modified microcapsule structure may regulate the release rate of carvacrol, resulting in a more sustained and stable antibacterial effect. Furthermore, the introduction of the hexadecyl group may also positively impact the physical stability of the microcapsules, extending their shelf life during storage and use. The modified microcapsule structure enhances resistance to chemical substances, effectively protecting the carvacrol activity within the microcapsules in chemically corrosive environments such as acids, alkalis, and salt spray, maintaining the coating's anti-corrosion effectiveness. In summary, the use of 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.

[0036] Optionally, the drier is selected from zirconium drier.

[0037] Optionally, the coupling agent is selected from titanate coupling agents.

[0038] 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.

[0039] Optionally, the preparation method comprises the following steps:

[0040] First, pour isopropyl alcohol into a reactor, 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 to the reactor, and stir at a speed of 300-400 r / min for 0.5-1 hour to obtain the UV triple-proof paint.

[0041] By adopting the above-mentioned technical solution, the present invention's UV conformal coating preparation method achieves the preparation of a high-performance conformal coating while ensuring efficient, uniform mixing and controlled reaction conditions. This is specifically reflected in the following advantages: First, the majority of the solid raw materials are added at low temperatures (80-90°C), which facilitates the gradual dissolution of the resin and additives, avoiding local overheating that could lead to uneven reactions or raw material decomposition. The remaining raw materials are then added after the temperature is lowered to 30-45°C, effectively protecting the activity of temperature-sensitive ingredients such as coupling agents and fluorescent initiators, ensuring smooth subsequent reactions. A higher stirring speed (300-500 rpm) is used during the initial reaction to facilitate rapid dispersion and accelerate the dissolution of the resin, as well as promoting initial mixing and ensuring no significant agglomeration. Later, the stirring speed is reduced to 300-400 rpm, achieving a gentler stirring rate that facilitates fine mixing, especially when adding delicate materials such as microcapsules and fluorescent sensitive materials, reducing shear damage and maintaining structural integrity. Careful control of temperature and time throughout the process ensures the full progress of each reaction step 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 0.5-1 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 strength 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 through refined control of temperature, stirring rate and time, but also protects the activity of sensitive components. 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, meeting the strict requirements of the high-end electronic assembly industry for protective materials and promoting the innovation and application of three-proof paint technology.

[0042] In summary, the present invention includes at least one of the following beneficial technical effects:

[0043] 1. The UV conformal coating provided in this application takes into account the multiple requirements of performance improvement and practical application. Through carefully selected raw material ratios and innovative microencapsulation technology, it achieves a significant upgrade in the performance of traditional conformal coatings. The UV conformal coating formula provided in this application is based on acrylic resin and epoxy resin, creating a hard, chemical-resistant coating that effectively resists moisture, smoke, and chemical corrosion, ensuring stable operation of equipment in harsh environments. The incorporation of rosin-modified alkyd resin enhances the coating's flexibility and sealing properties. The synergistic use of butyl acetate and isopropyl alcohol as solvents increases the coating's density, effectively isolating it from external moisture and dust, and extending the life of electronic components. Particularly noteworthy is the inclusion of melamine formaldehyde resin-porous starch-carvacrol microcapsules in the formula. The microencapsulation technology slowly releases carvacrol, resulting in not only a long-lasting antibacterial effect but also enhanced chemical stability and water resistance, further improving corrosion resistance. The addition of hollow glass microspheres not only reduces the coating's weight but also further enhances its water resistance. The application of coupling agents 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 agents facilitates quality monitoring during the coating process. In summary, the UV conformal coating provided by this application effectively overcomes the limitations of existing conformal coating technologies in terms of waterproofing, antibacterial properties, and corrosion resistance through finely optimized raw material ratios and the application of new materials. It provides a comprehensive and efficient protection solution for electronic equipment, fully meets the market's urgent demand for high-performance protective materials, and effectively promotes technological progress and innovation in the electronics assembly industry.

[0044] 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.

[0045] 3. Hexadecyltrimethoxysilane-modified melamine-formaldehyde resin-porous starch-carvacrol microcapsules replace the original melamine-formaldehyde resin-porous starch-carvacrol microcapsules, achieving several performance improvements and optimizations: The introduction of hexadecyltrimethoxysilane imparts a hydrophobic long-chain structure to the microcapsule surface, significantly enhancing the coating's hydrophobicity and water repellency. This modification helps prevent moisture penetration, protecting the stability of electronic devices in humid environments and reducing the risk of moisture-induced corrosion and short circuits. The modified layer formed by the hexadecyl groups and ethanol strengthens the adhesion between the microcapsules and the coating substrate, resulting in a more uniform distribution of the microcapsules within the coating and preventing them from falling off, thereby improving the overall stability and durability of the coating. This is particularly important for electronic devices subjected to mechanical stress and environmental fluctuations. The modified microcapsule structure may regulate the release rate of carvacrol, resulting in a more sustained and stable antimicrobial effect. Furthermore, the introduction of the hexadecyl group may also positively impact the physical stability of the microcapsules, extending their shelf life during storage and use. The modified microcapsule structure enhances resistance to chemical substances, enabling the microcapsules to more effectively protect the carvacrol activity within and maintain the coating's anti-corrosion effectiveness in chemically corrosive environments such as acid, alkali, and salt spray. In summary, the hexadecyltrimethoxysilane modification technology not only enhances the microcapsules' hydrophobic and water-repellent properties, but also improves their adhesion to the coating, stability, and chemical resistance. This provides a more comprehensive and long-term protection measure for electronic devices, meeting the needs of demanding protective applications and promoting the further development of electronic assembly technology.

[0046] 4. The present method for preparing a UV conformal coating achieves the production of a high-performance conformal coating while ensuring efficient, uniform mixing and controlled reaction conditions. This method offers the following advantages: First, the majority of the solid raw materials are added at low temperatures (80-90°C), which facilitates the gradual dissolution of the resin and additives, avoiding local overheating that could lead to uneven reactions or raw material decomposition. The remaining raw materials are then added after the temperature is lowered to 30-45°C, effectively protecting the activity of temperature-sensitive ingredients such as coupling agents and fluorescent initiators, ensuring smooth subsequent reactions. A higher stirring speed (300-500 rpm) is used during the initial reaction to facilitate rapid dispersion and accelerate the dissolution of the resin, as well as promoting initial mixing and ensuring no significant agglomeration. The gentler stirring speed, reduced to 300-400 rpm, facilitates fine mixing, especially when adding delicate materials such as microcapsules and fluorescent sensitive materials, minimizing shear damage and maintaining structural integrity. Careful control of temperature and time throughout the entire process ensures the full progress of each reaction step 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 0.5-1 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 strength 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 through refined control of temperature, stirring rate and time, but also protects the activity of sensitive components. 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, meeting the strict requirements of the high-end electronic assembly industry for protective materials and promoting the innovation and application of three-proof paint technology. DETAILED DESCRIPTION

[0047] The present application is further described in detail below with reference to the embodiments.

[0048] Acrylic resin: Qingdao Yufengda Fine Chemical Co., Ltd., CAS No. 9003-01-4.

[0049] Epoxy resin: Langfang Yushi Anticorrosion Materials Co., Ltd., model 6101.

[0050] Rosin modified alkyd resin: Guangde Bades Chemical Co., Ltd., solid content is 70±2.

[0051] Zirconium drier: Guangzhou Si Tu Yuan Chemical Co., Ltd., Walker VOK-Zirconium 12.

[0052] BYK-066N defoamer: Shanghai Mengdihu Industrial Co., Ltd., model BYK-066N.

[0053] Butyl acetate: CAS number 123-86-4, purity 99%.

[0054] Isopropyl alcohol: CAS number 67-63-0, purity 99%.

[0055] Fluorescent agent: CAS No. 7128-64-5, purity 99%.

[0056] Titanate coupling agent: CAS No. 109037-78-7, purity 99%.

[0057] Hollow glass microspheres: Hebei Huishun Mining Co., Ltd., purity 99%.

[0058] Melamine: CAS number 108-78-1, purity 99%.

[0059] Formaldehyde: CAS number 50-00-0, purity 99%.

[0060] Porous starch: Shaanxi Bolin Biotechnology Co., Ltd., purity 99%.

[0061] Carvacrol: CAS No. 499-75-2, purity 99%.

[0062] Hexadecyltrimethoxysilane: CAS number 16415-12-6, purity 99%.

[0063] Preparation Example 1

[0064] This preparation example provides a melamine formaldehyde resin-porous starch-carvacrol microcapsule, and the preparation method comprises the following steps:

[0065] A1. Porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 25 minutes, ultrasonically dispersed for 25 minutes, centrifuged for 30 minutes, and washed (3 times with anhydrous ethanol) to prepare porous starch-carvacrol microspheres;

[0066] 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 and react for 0.5h to obtain a 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, react for 2h, cool, filter, and dry to obtain melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0067] The mass concentration of the formaldehyde aqueous solution is 35%.

[0068] Preparation Example 2

[0069] The difference between this preparation example and preparation example 1 is that the preparation method includes the following steps:

[0070] A1. Porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 minutes, ultrasonically dispersed for 30 minutes, centrifuged for 34 minutes, and washed (3 times with anhydrous ethanol) to prepare porous starch-carvacrol microspheres;

[0071] A2. Adjust the pH of the formaldehyde aqueous solution to 8.0, add melamine, mix and stir, and raise the temperature to 70° C. for 0.5 h to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of the formaldehyde aqueous solution to melamine is 2:1;

[0072] 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, and the mixture was stirred and the temperature was raised to 85° C. The mixture was reacted for 2.5 h, cooled, filtered, and dried to obtain melamine-formaldehyde resin-porous starch-carvacrol microcapsules.

[0073] The mass concentration of the formaldehyde aqueous solution is 36%.

[0074] Preparation Example 3

[0075] The difference between this preparation example and preparation example 1 is that the preparation method includes the following steps:

[0076] A1. 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 prepare porous starch-carvacrol microspheres;

[0077] A2. Adjust the pH of the formaldehyde aqueous solution to 8.0, add melamine, mix and stir, and raise the temperature to 70° C. for 0.5 h 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;

[0078] 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 1:5, the pH was adjusted to 6.0, and the mixture was stirred and the temperature was raised to 85° C. The mixture was reacted for 3 h, cooled, filtered, and dried to obtain the melamine-formaldehyde resin-porous starch-carvacrol microcapsules.

[0079] The mass concentration of the formaldehyde aqueous solution is 37%.

[0080] Preparation Example 4

[0081] The difference between this preparation example and preparation example 2 is that the preparation method includes the following steps:

[0082] A1. Porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 minutes, ultrasonically dispersed for 30 minutes, centrifuged for 34 minutes, and washed (3 times with anhydrous ethanol) to prepare porous starch-carvacrol microspheres;

[0083] A2. Adjust the pH of the formaldehyde aqueous solution to 8.0, add melamine, mix and stir, and raise the temperature to 70° C. for 0.5 h to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of formaldehyde to melamine is 2:1;

[0084] 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 prepare melamine-formaldehyde resin-porous starch-carvacrol microcapsules.

[0085] A4. Dissolve hexadecyltrimethoxysilane in ethanol, add the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in step A3, and soak for 2 hours to prepare 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.

[0086] Preparation Example 5

[0087] The difference between this preparation example and preparation example 2 is that the preparation method includes the following steps:

[0088] A1. Porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 minutes, ultrasonically dispersed for 30 minutes, centrifuged for 34 minutes, and washed (3 times with anhydrous ethanol) to prepare porous starch-carvacrol microspheres;

[0089] A2. Adjust the pH of the formaldehyde aqueous solution to 8.0, add melamine, mix and stir, and raise the temperature to 70° C. for 0.5 h to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of formaldehyde to melamine is 2:1;

[0090] 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 prepare melamine-formaldehyde resin-porous starch-carvacrol microcapsules.

[0091] A4. Dissolve hexadecyltrimethoxysilane in ethanol, add the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in step A3, and soak for 2 hours to prepare 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.

[0092] Preparation Example 6

[0093] The difference between this preparation example and preparation example 2 is that the preparation method includes the following steps:

[0094] A1. Porous starch and carvacrol were mixed in a weight ratio of 1:1, stirred for 30 minutes, ultrasonically dispersed for 30 minutes, centrifuged for 34 minutes, and washed (3 times with anhydrous ethanol) to prepare porous starch-carvacrol microspheres;

[0095] A2. Adjust the pH of the formaldehyde aqueous solution to 8.0, add melamine, mix and stir, and raise the temperature to 70° C. for 0.5 h to obtain a melamine-formaldehyde resin primary polymer; in this step, the weight ratio of formaldehyde to melamine is 2:1;

[0096] 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 prepare melamine-formaldehyde resin-porous starch-carvacrol microcapsules.

[0097] A4. Dissolve hexadecyltrimethoxysilane in ethanol, add the melamine formaldehyde resin-porous starch-carvacrol microcapsules prepared in step A3, and soak for 2 hours to prepare 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.

[0098] Example 1

[0099] This embodiment provides a UV conformal coating, 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 a drying agent; 3 parts of a defoaming agent; 5 parts of butyl acetate; 45 parts of isopropyl alcohol; 1 part of a fluorescent agent; 3 parts of a coupling agent; 16 parts of hollow glass microspheres; and 8 parts of melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0100] The method for preparing UV conformal coating in this embodiment includes the following steps:

[0101] First, pour isopropyl alcohol into the reactor, then add acrylic resin, epoxy resin, rosin-modified alkyd resin, and hollow glass microspheres, heat to 90°C, stir at 400 r / min for 2 hours, then cool to 40°C, add the remaining raw materials to the reactor, and stir at 300 r / min for 1 hour to obtain the UV triple-proof paint.

[0102] The drier in this embodiment is selected from zirconium drier.

[0103] The defoamer in this embodiment is selected from BYK-066N defoamer.

[0104] The coupling agent in this embodiment is selected from titanate coupling agent.

[0105] The melamine formaldehyde resin-porous starch-carvacrol microcapsules in this example were prepared according to Preparation Example 1.

[0106] Examples 2-4

[0107] Example 2

[0108] The difference between this embodiment and Example 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.

[0109] Example 3

[0110] The difference between this embodiment and Example 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.

[0111] Example 4

[0112] The difference between this embodiment and Example 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.

[0113] Comparative Examples 1-3

[0114] Comparative Example 1

[0115] The difference between this comparative example and Example 3 is that hollow glass microspheres were not added when preparing the UV conformal paint.

[0116] Comparative Example 2

[0117] 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.

[0118] Comparative Example 3

[0119] 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.

[0120] Comparative Example 4

[0121] 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.

[0122] Experimental testing:

[0123] Antibacterial performance: Antibacterial performance is tested in accordance with IPC-TM-650 2.6.1.

[0124] Anti-corrosion performance: The anti-corrosion performance of the UV conformal coatings prepared in the examples of the present application and the comparative example was tested according to the method of IPC-TM-650-2.6.15. The results are shown in Table 1.

[0125] Substrate adhesion: tested using GB / T92861998.

[0126] Anti-smoke: Salt spray resistance test: GB / T2423.172008 is used for testing.

[0127] The experimental test results of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1.

[0128] Table 1 - Experimental test results of Examples 1-4 and Comparative Examples 1-3

[0129] 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

[0130] Results Analysis: Experimental results show that adjusting the weight ratio of hollow glass microspheres to melamine-formaldehyde resin-porous starch-carvacrol microcapsules in Examples 2 to 4, particularly reaching a specific ratio of 1:0.5, results in UV conformal coatings exhibiting excellent antibacterial, anticorrosive, and antismog properties. The superiority of this optimized configuration, as demonstrated in Table 1, highlights the critical role of formulation balance in enhancing protective efficacy. Comparative analysis shows that removing the hollow glass microspheres in Comparative Example 1, omitting the melamine-formaldehyde resin-porous starch-carvacrol microcapsules in Comparative Example 2, and omitting both components in Comparative Example 3 all resulted in decreased protective performance. These comparative experiments strongly support the indispensable role of the hollow glass microsphere and microencapsulated carvacrol composite system in enhancing the overall performance of UV conformal coatings. More importantly, while some antibacterial activity was observed in Comparative Example 4, which directly added non-microencapsulated carvacrol instead of microcapsules, it failed to achieve the same stable antibacterial effect as microencapsulation technology. Direct application of carvacrol results in fluctuations in antibacterial efficacy due to its volatilization, revealing its limitations in UV conformal coatings. 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, overcoming the drawbacks of traditional addition methods and providing a scientific basis for the advancement of UV conformal coating technology.

[0131] Examples 5-6

[0132] Example 5

[0133] The difference between this embodiment and embodiment 3 is that the weight percentages of some components are changed when preparing the UV conformal coating. The differences are shown in Table 2.

[0134] Table 2 - Differences between Example 5-6 and Example 3

[0135] Ingredients (servings) 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

[0136] The experimental test results of Examples 5-6 are shown in Table 3.

[0137] Table 3 - Experimental test results of Examples 5-6

[0138]

[0139]

[0140] Result analysis: The difference between Examples 5-6 and Example 3 is that the weight percentages of some components are different when preparing the UV conformal coating. Combined with the experimental test results in Table 3, it can be seen that the comprehensive performance of the UV conformal coating prepared in Example 5 is better.

[0141] Examples 7-11

[0142] Example 7

[0143] The difference between Examples 7-11 and Example 5 is that when preparing the UV conformal paint, 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.

[0144] 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 conformal coating is 176 parts.

[0145] 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%.

[0146] The differences between Examples 7-11 and Example 5 are shown in Table 4.

[0147] Proportion = (variable 1 + variable 2) / total weight of matrix * 100%.

[0148] Table 4 - Differences between Examples 7-11 and Example 5

[0149]

[0150] The experimental test results of Examples 7-11 are shown in Table 5.

[0151] Table 5 - Experimental test results of Examples 7-11

[0152]

[0153]

[0154] Results Analysis: The difference between Examples 7-11 and Example 5 is that when preparing the UV conformal coating, the total weight ratio of the hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV conformal coating is different. Combined with the experimental test results in Table 5, it can be seen that when the total weight ratio of the hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV conformal coating is 13.64-16.48%, the comprehensive performance of the UV conformal coating prepared is better. When the total weight ratio of the hollow glass microspheres and melamine formaldehyde resin-porous starch-carvacrol microcapsules in the UV conformal coating is 15.08%, the comprehensive performance of the UV conformal coating prepared is the best. When the ratio is too high or too low, the comprehensive performance will be reduced.

[0155] Examples 12-16

[0156] Example 12

[0157] The difference between this embodiment and Example 10 is that the preparation parameters of the melamine formaldehyde resin-porous starch-carvacrol microcapsules used in the preparation of the UV conformal coating are different. The melamine formaldehyde resin-porous starch-carvacrol microcapsules in this embodiment are prepared by Preparation Example 2.

[0158] Example 13

[0159] The difference between this embodiment and Example 10 is that the preparation parameters of the melamine formaldehyde resin-porous starch-carvacrol microcapsules used in the preparation of the UV conformal coating are different. The melamine formaldehyde resin-porous starch-carvacrol microcapsules in this embodiment are prepared by Preparation Example 3.

[0160] Example 14

[0161] The difference between this embodiment and Example 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 the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0162] Example 15

[0163] The difference between this example and Example 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 the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0164] Example 16

[0165] The difference between this example and Example 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 the melamine formaldehyde resin-porous starch-carvacrol microcapsules.

[0166] The experimental test results of Examples 12-16 are shown in Table 6.

[0167] Table 6 - Experimental test results of Examples 12-16

[0168]

[0169] Results Analysis: Examples 12-13 differ from Example 10 in that different preparation parameters were used for the melamine formaldehyde resin-porous starch-carvacrol microcapsules used in the UV conformal coating. Combined with the experimental test results in Table 6, the UV conformal coating prepared in Example 12 exhibits superior overall performance.

[0170] The difference between Examples 14-16 and Example 12 is that, when preparing the UV conformal coating, an equal amount of hexadecyltrimethoxysilane-modified melamine formaldehyde resin-porous starch-carvacrol microcapsules were used instead of the 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 the melamine formaldehyde resin-porous starch-carvacrol microcapsules can further improve the anti-smog performance of the prepared UV conformal coating.

[0171] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A UV conformal paint, characterized in that: The UV conformal paint comprises the following raw materials in parts by weight: 40-55 parts of acrylic resin; 10-15 parts of epoxy resin; 10-15 parts of rosin-modified alkyd resin; 7-10 parts of drying agent; 3-5 parts defoaming agent 5-9 parts of butyl acetate; 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.

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 conformal 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 conformal paint.

6. The UV conformal paint according to 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 prepare 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 the 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 triple-proof paint.

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