WO2021031673A1 - 一种 uv 纳米防腐涂料、所得电路板及制备方法和应用 - Google Patents

一种 uv 纳米防腐涂料、所得电路板及制备方法和应用 Download PDF

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WO2021031673A1
WO2021031673A1 PCT/CN2020/096357 CN2020096357W WO2021031673A1 WO 2021031673 A1 WO2021031673 A1 WO 2021031673A1 CN 2020096357 W CN2020096357 W CN 2020096357W WO 2021031673 A1 WO2021031673 A1 WO 2021031673A1
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parts
nano
anticorrosive coating
circuit board
coating
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PCT/CN2020/096357
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English (en)
French (fr)
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王海梅
张吉义
董德智
赵心蕾
张友法
顾万诚
宋楷星
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青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021031673A1 publication Critical patent/WO2021031673A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C09D163/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
    • C09D123/28—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
    • C09D123/28—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • C09D123/286—Chlorinated polyethylene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/28—Applying non-metallic protective coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

Definitions

  • the invention belongs to the technical field of anticorrosive coatings, and particularly refers to a UV nano anticorrosive coating for circuit boards, the obtained coating, and a preparation method and application.
  • the circuit boards of white goods and electronic products are usually exposed to humid, dusty, salt spray and high temperature environments during use.
  • white goods and electronic products used in coastal or offshore areas such as circuit boards
  • the electronic components are prone to problems such as mildew and corrosion, which can cause circuit board failures, reduce the reliability of white goods and electronic products, and shorten the service life of components.
  • the surface of the circuit board is usually coated with a three-proof paint to improve the waterproof, mildew and corrosion resistance of the circuit board.
  • the existing three-proof paint has certain three-proof performance, the hydrophilic properties of its surface make it easy for liquid droplets and dust to be adsorbed on the surface of the circuit board and are not easy to desorb, resulting in long-term waterproofing, medium penetration and resistance of the coating.
  • the dust and antibacterial effect is poor; moreover, the three-proof paint is not resistant to solvents, poor weather resistance, poor recoatability, slow curing speed and high VOC emission during the coating preparation process.
  • the superhydrophobic surface has shown excellent comprehensive performance in terms of water resistance, oil resistance, dust resistance and corrosion resistance. It has been widely used in materials for antibacterial and corrosion protection, water collection and oil-water separation, etc. field. Studies have shown that the large amount of air trapped by the micron and nanostructures of the superhydrophobic surface exposed to the environment can greatly reduce the contact area between corrosive media and the surface, hinder the penetration and diffusion of the media, thereby effectively improving the physical barrier effect and inhibiting corrosion The budding development process. The deposition of dust will affect the heat dissipation of the circuit board, increase the temperature of the circuit board and burn out the components, and can also absorb moisture and corrode the circuit board.
  • the dustproof and self-cleaning characteristics of the super-hydrophobic surface can effectively prevent the adsorption and accumulation of dust on the surface of the circuit board for a long time, thereby avoiding the adverse effects of dust accumulation.
  • the special wettability and low adhesion of the superhydrophobic surface can effectively delay the adsorption and accumulation of liquid droplets on the surface.
  • the adsorbed liquid droplets are spherical on the surface and easy to fall off, making it difficult for water droplets to stay on the surface for a long time and penetrate the substrate; At the same time, the formation of water film and water bridge can be prevented, and the problem of poor heat dissipation of the circuit board and bacteria breeding can be avoided.
  • hydrophobic coatings for circuit boards have also appeared in the prior art.
  • the formulation design of such hydrophobic coatings is unreasonable and most of them are prepared by a single spray method.
  • the surface of the hydrophobic coating has relatively high adhesion. It is not conducive to the rapid shedding of droplets, and the long-term waterproof performance is poor.
  • the purpose of the present invention is to provide a UV nano anticorrosive coating for circuit boards, which aims to solve the problem that the hydrophobic coating for circuit boards in the prior art has high surface adhesion, which causes its hydrophobicity to fail easily and poor long-term waterproof performance, and its preparation method Complexity and high equipment requirements make it difficult to achieve mass production.
  • the present invention adopts the following technical solutions to achieve:
  • a UV nano anticorrosive coating of the present invention includes the following raw materials in parts by weight: 20-40 parts by weight of UV resin, 20-40 parts of acrylate monomer, 3-8 parts of initiator, and 0.5-2 parts of rust inhibitor Parts, 1-5 parts of superhydrophobic nano powder, 1-5 parts of additives.
  • the UV nano anticorrosive coating of the present invention includes UV resin, acrylate monomer, initiator, anti-rust agent, superhydrophobic nano powder and auxiliary agent.
  • the formula design is scientific, and each raw material component is complementary to each other, which is synergistic with superhydrophobic nano powder.
  • the obtained UV nano anticorrosive coating is solvent-free. After coating, it has good leveling and can be cured quickly under UV light conditions.
  • the obtained UV nano anticorrosive coating is transparent, high gloss, high hardness, good solvent resistance and adhesion.
  • the UV resin of the present invention is also called photosensitive resin, which is an oligomer that can quickly undergo physical and chemical changes in a short time after being irradiated by light, and then cross-link and cure.
  • UV resin is a relatively high molecular weight.
  • UV resin is the base resin of UV coatings, and it is combined with photoinitiators, reactive diluents and various additives Compound, namely constitute UV coating.
  • the superhydrophobic nano powder includes the following raw materials in parts by weight: 1-15 parts of nano silica sol, 2-10 parts of ammonia water, 6-16 parts of deionized water, and 0.1-1 parts of tetraethylorthosilicate , 0.1-2 parts of long-chain siloxane or fluorosilane, 60-100 parts of anhydrous ethanol.
  • the superhydrophobic nano powder of the present invention is prepared by nano silica sol in ammonia solution, deionized water and absolute ethanol through the action of tetraethyl orthosilicate and long-chain siloxane or fluorosilane, ammonia water is preferably used Ammonia water with a mass concentration of 35%, anhydrous ethanol can also be replaced by anhydrous methanol or anhydrous isopropanol.
  • This superhydrophobic nanopowder has good hydrophobic properties, excellent superhydrophobic and superoleophobic properties, and can be used for Self-cleaning, anti-condensation and frosting, anti-corrosion surface, easy to uniformly disperse, simple preparation process, suitable for industrial production.
  • the UV resin is any one or more of UV epoxy acrylate, UV epoxy resin, UV polyester acrylate, UV aliphatic polyurethane, UV urethane acrylate, and UV silicone resin.
  • the UV resin of the present invention can choose many types. This UV resin has a wide source, is cheap and easy to obtain, and is convenient to use; these UV resins can be cured quickly and have good performance adjustability; 100% solid content, no organic solvent release , Environmentally friendly; it can be made into coatings with high weather resistance, high elasticity, high hardness and high adhesion; it has a high solid content, and a coating film with excellent performance can be obtained in one coating, and it is easy to apply, protect and decorate obvious.
  • the acrylate monomer is dipropylene glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, diethylene glycol diacrylate, neopentyl glycol Any one or more of diacrylates.
  • the acrylate monomer of the present invention is mainly acrylate, which can be aliphatic, aromatic, or alkyl-oxidized acrylate. These acrylate monomers have low viscosity, strong diluting ability, and volatility. Low, high flash point and easy to dissolve characteristics, used as a monomer in UV coatings, has good compatibility with acrylic prepolymers, can give the light-cured coating film better flexibility and stability, and enhance Film adhesion and improved flexibility.
  • the auxiliary agent includes a leveling agent and a drier
  • the leveling agent is any one or more of a silicone leveling agent and an acrylate leveling agent
  • the drier is lead acetate , Manganese sulfate, manganese chloride and cobalt acetate any one or more of them.
  • the present invention uses silicones and acrylates as leveling agents, has good leveling effect, can better integrate with the UV resin and acrylate monomers in the raw materials, reduces the surface tension of the coating, and improves the coating coverage , Make the film uniform; the present invention uses lead acetate, manganese sulfate, manganese chloride and cobalt acetate as the drier, the use of the drier accelerates the curing of the coating.
  • the initiator is any one or more of benzoin, benzophenone, aroylphosphine oxide, benzophenone, diaryliodonium salt, and triarylsulfonium salt.
  • the addition of the auxiliary agent in the present invention can effectively reduce the surface tension of the coating, improve the coverage of the coating, make the film formation uniform and natural, and accelerate the curing of the coating.
  • the rust inhibitor is RT-941 rust inhibitor.
  • the anti-rust agent in the present invention is RT-941 series anti-rust agent, which has good anti-rust effect, is cheap and easy to obtain, and is convenient to use.
  • the method for preparing UV nano anticorrosive coating for circuit boards of the present invention includes the following steps: taking UV resin, acrylate monomer, initiator, rust inhibitor, superhydrophobic nano powder and auxiliary agent, Mix and stir continuously for 1-2h to obtain UV nano anticorrosive coating.
  • the preparation method of the UV nano anticorrosive coating of the present invention is simple, only needs to mix and stir the raw materials, it is easy to operate, has low equipment requirements, fast curing speed, zero VOC emission, meets the requirements of energy saving, emission reduction and green production, and is easy to realize Industrialization.
  • the preparation method of the superhydrophobic nano powder is: taking 1-15 parts of nano silica sol, 2-10 parts of ammonia water, 6-16 parts of deionized water, 0.1-1 parts of tetraethylorthosilicate, 0.1-2 parts of long-chain siloxane or fluorosilane and 60-100 parts of anhydrous ethanol, mix and stir continuously for 12-48 h to obtain a superhydrophobic nano powder solution; filter the superhydrophobic nano powder solution and dry to obtain Super hydrophobic nano powder.
  • the superhydrophobic nano powder of the present invention disperses nano silica sol, ammonia water, deionized water, tetraethylorthosilicate and long-chain siloxane or fluorosilane in absolute ethanol, and is mixed, stirred, filtered and dried. And what is obtained, in the present invention, it can also be placed for 3-5 days after continuous mechanical stirring for 6-8 hours, the filtration can be centrifugal filtration separation, the preparation method is simple, the operation is convenient, the equipment requirements are low, and the industrialization is easy to realize.
  • a circuit board with an anticorrosive coating of the present invention includes a circuit board, a primer coating and a UV nano anticorrosive coating layer, wherein the primer coating is located on the surface of the circuit board, and
  • the primer coating is any one of a chlorinated polyolefin coating, a high chlorinated polyethylene coating, and a chlorinated polypropylene coating;
  • the UV nano anticorrosive coating layer is located on the surface of the primer coating,
  • the UV nano anticorrosive coating layer is formed by curing after coating the UV nano anticorrosive coating described above.
  • the anti-corrosion coating on the circuit board with the anti-corrosion coating of the present invention is an organic combination of a primer coating and a UV nano anti-corrosion coating layer.
  • the presence of the primer coating can improve the adhesion between the coating and the circuit board.
  • the UV nano anticorrosive coating containing super-hydrophobic nano powder is used as the top coat for multi-layer and multi-pass coating.
  • the coating method can be brushing, spraying or dipping; the film thickness of the resulting anticorrosive coating is 10-30 ⁇ m ,
  • the visible light transmittance is 90%
  • the pencil hardness is 3H
  • the adhesion measured by the circle method is 0,
  • the water contact angle is more than 100°
  • the neutral salt spray is more than 1500h; it can effectively Prevent or delay the penetration and diffusion of droplets and corrosive media into the circuit board, thereby improving the corrosion resistance of the circuit board.
  • It can be used in humid, dusty and salt spray environments, and can meet the requirements of white goods and electronics in coastal or offshore areas. Anti-corrosion requirements of circuit boards such as products.
  • a method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps: taking the circuit board, cleaning, and drying; uniformly coating a chlorinated polyolefin solution on the surface of the circuit board to form a bottom Paint, leave it at room temperature for 3-5 minutes to make the primer semi-cured to obtain a primer coating; apply the UV nano anticorrosive coating obtained according to the above-mentioned preparation method of UV nano anticorrosive coating uniformly on the surface of the primer coating , UV curing, the intensity of UV light is 600-800MJ/cm 2 , the irradiation time is 1-2s, and the circuit board with anticorrosive coating is obtained.
  • the preparation method of the circuit board with anticorrosive coating of the present invention is that after the circuit board is cleaned and dried, a layer of chlorinated polyolefin solution is first coated to form a primer coating, and then UV nano anticorrosive paint is coated to form UV nano
  • the anticorrosive coating layer has short process flow, convenient operation, no special requirements for equipment, short curing time, high production efficiency, and easy realization of industrialization.
  • the application of a circuit board with an anti-corrosion coating of the present invention is used in white home appliances or electronic products.
  • the circuit board with anticorrosive coating of the present invention has high adhesion, good hydrophobic performance, can effectively prevent the penetration of liquid droplets and corrosive media into the circuit board, has good long-term waterproof performance, and is especially suitable for white home appliances and electronic products in coastal or offshore areas in.
  • the UV nano anticorrosive coating of the present invention takes UV resin and acrylate monomer as the main components and adds superhydrophobic nano powder and rust inhibitor, and uses it as The topcoat is coated on the surface of the circuit board, which can effectively hinder the penetration and diffusion of corrosive media, thereby improving the corrosion resistance of the circuit board;
  • the present invention also uses chlorinated polyolefin as a primer to coat the surface of the circuit board, not only Improve the anti-corrosion and corrosion resistance of the coating, and increase the adhesion of the coating;
  • the circuit board with anti-corrosion coating has high transparency, small thickness, good solvent resistance, high adhesion, and recoating.
  • the circuit board with the anticorrosive coating of the present invention can withstand a 1500h neutral salt spray test. After the 1500h neutral salt spray test, the coating has no bubbling detachment phenomenon.
  • Figure 1 is an optical picture of a circuit board with an anticorrosive coating obtained in Example 1 of the present invention after a 1500h test of neutral salt spray;
  • Figure 2 is an optical picture of the control sample listed in the present invention after being tested in neutral salt spray for 1500h;
  • Example 3 is an effect diagram of the adhesion test of the anti-corrosion coating of the circuit board with the anti-corrosion coating obtained in Example 1 of the present invention
  • Figure 4 is an effect diagram of the adhesion test of the hydrophobic coating of the control sample listed in the present invention.
  • Example 5 is a diagram showing the hardness test effect of the anti-corrosion coating of the circuit board with the anti-corrosion coating obtained in Example 1 of the present invention
  • Figure 6 is a hardness test effect diagram of the hydrophobic coating of the control sample listed in the present invention.
  • FIG. 7 is a schematic diagram of the anti-corrosion process of the circuit board with anti-corrosion coating of the present invention.
  • FIG. 8 is a second schematic diagram of the anti-corrosion process of the circuit board with anti-corrosion coating of the present invention.
  • the UV nano anticorrosive coating of the present invention includes the following raw materials in parts by weight: 20-40 parts by weight of UV resin, 20-40 parts of acrylate monomer, 3-8 parts of initiator, 0.5-2 parts of rust inhibitor, super hydrophobic 1-5 parts of nano powder, 1-5 parts of additives.
  • the superhydrophobic nano powder includes the following raw materials in parts by weight: 1-15 parts of nano silica sol, 2-10 parts of ammonia, 6-16 parts of deionized water, and 0.1-1 parts of tetraethylorthosilicate, 0.1-2 parts of long-chain siloxane or fluorosilane, 60-100 parts of absolute ethanol.
  • the UV resin is any one or more of UV epoxy acrylate, UV epoxy resin, UV polyester acrylate, UV aliphatic polyurethane, UV urethane acrylate, and UV silicone resin.
  • the acrylate monomer is tripropylene glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, diethylene glycol diacrylate phthalate, neopentyl glycol diacrylate Any one or more of acrylates.
  • the auxiliary agent includes a leveling agent and a drier
  • the leveling agent is any one or more of a silicone leveling agent and an acrylate leveling agent
  • the drier is lead acetate , Manganese sulfate, manganese chloride and cobalt acetate
  • the initiator is benzoin, diphenyl ethyl ketone, aroyl phosphine oxide, benzophenone, diaryl iodide Any one or more of onium salt and triarylsulfonium salt
  • the rust inhibitor is RT-941 rust inhibitor.
  • the preparation method of UV nano anticorrosive coating for circuit board of the present invention includes the following steps: take UV resin, acrylate monomer, initiator, antirust agent, superhydrophobic nano powder and auxiliary agent, mix, and continuously stir 1 -2h, get UV nano anticorrosive coating.
  • the preparation method of the superhydrophobic nano powder is: taking 1-15 parts of nano silica sol, 2-10 parts of 35%wt ammonia water, 6-16 parts of deionized water, and 0.1-1 parts of tetraethylorthosilicate. Parts, 0.1-2 parts of long-chain siloxane or fluorosilane and 60-100 parts of absolute ethanol, mix and stir continuously for 12-48 h to obtain superhydrophobic nano powder solution; filter the superhydrophobic nano powder solution and dry , Get super hydrophobic nano powder.
  • a circuit board with an anticorrosive coating of the present invention includes a circuit board, a primer coating and a UV nano anticorrosive coating layer, the primer coating is located on the surface of the circuit board, and the primer coating is Any one of chlorinated polyolefin coating, high chlorinated polyethylene coating, and chlorinated polypropylene coating; the UV nano anticorrosive coating layer is located on the surface of the primer coating, and the UV nano anticorrosive The coating layer is cured according to the UV nano anticorrosive coating described above.
  • the method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps: taking the circuit board, cleaning, and drying; uniformly coating a chlorinated polyolefin solution on the surface of the circuit board to form a primer, and placing it at room temperature. -5min, the primer is semi-cured to obtain a primer coating; the UV nano anticorrosive coating obtained according to the preparation method of the UV nano anticorrosive coating described above is uniformly coated on the surface of the primer coating and cured by ultraviolet light, The intensity of the ultraviolet light is 600-800MJ/cm 2 , and the irradiation time is 1-2s, to obtain a circuit board with anticorrosive coating.
  • circuit board with an anti-corrosion coating of the present invention is used in white home appliances or electronic products.
  • the method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps:
  • UV nano anticorrosive coating combine 35 parts of UV epoxy acrylate, 30 parts of tripropylene glycol diacrylate, 6 parts of initiator benzoin, 1 part of rust inhibitor RT-941, and the superhydrophobicity obtained in step 1) 4 parts of nano powder, 1 part of organic silicon leveling agent and 1 part of manganese chloride, mixed, and continuous mechanical stirring for 2 hours to obtain UV nano anticorrosive coating;
  • step 5 Apply the UV nano anticorrosive coating obtained in step 2) uniformly on the surface of the primer coating, and cure with ultraviolet light.
  • the intensity of ultraviolet light is 600MJ/cm 2
  • the irradiation time is 2s to obtain a circuit with anticorrosive coating. board.
  • the method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps:
  • UV nano anticorrosive coating 20 parts of UV polyester acrylate, 20 parts of pentaerythritol triacrylate, 3 parts of initiator diphenyl ethyl ketone, 0.5 part of RT-941 series anti-corrosive agent, step 1) 1 part of super-hydrophobic nano powder, 1 part of acrylate leveling agent, mixed, and continuous mechanical stirring for 1 h to obtain UV nano anticorrosive coating;
  • step 5 Apply the UV nano anticorrosive coating obtained in step 2) uniformly on the surface of the primer coating, and cure with ultraviolet light.
  • the intensity of the ultraviolet light is 800MJ/cm 2 and the irradiation time is 1s to obtain a circuit with anticorrosive coating. board.
  • the method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps:
  • UV nano anticorrosive coating 40 parts of UV polyester acrylate, 40 parts of trimethylolpropane triacrylate, 8 parts of initiator aroyl phosphine oxide, 2 parts of RT-941 series rust inhibitor, steps 1) 5 parts of the obtained superhydrophobic nano powder and 5 parts of lead acetate are mixed, and continuously mechanically stirred for 2 hours to obtain UV nano anticorrosive coating;
  • step 5 Apply the UV nano anticorrosive coating obtained in step 2) uniformly on the surface of the primer coating, and cure with ultraviolet light.
  • the intensity of the ultraviolet light is 700MJ/cm 2
  • the irradiation time is 2s to obtain a circuit with an anticorrosive coating. board.
  • Example 1 to Example 3 The three circuit boards with anti-corrosion coatings obtained in Example 1 to Example 3 were subjected to visible light transmittance, film thickness, pencil hardness and adhesion test experiments, and the existing circuit boards with hydrophobic coatings were used as a counterpart
  • the control sample is also subjected to visible light transmittance, film thickness, pencil hardness and adhesion test experiments under the same conditions; among them, the visible light transmittance is measured by using an ultraviolet-visible spectrophotometer to measure the coating transmittance , The test wavelength range is 350-800nm; the film thickness is measured by a film thickness gauge; the pencil hardness is measured according to GB/T 6739-1996 "Pencil Method for Coating Hardness”; adhesion The measurement method is in accordance with GB/T 1720-1979 (1989) "Determination of Paint Film Adhesion", and the experimental results are shown in Table 1.
  • the visible light transmittance of the anti-corrosion coating of the circuit board with the anti-corrosion coating obtained by the method of the present invention is all above 80%
  • the film thickness is between 30-70 ⁇ m
  • the pencil hardness is 3H.
  • the adhesion force measured by the circle method is above level 2, and the surface static water contact angle is greater than 100°, which can withstand the neutral salt spray test for more than 1000h; however, the visible light transmittance of the hydrophobic coating of the control sample is only 75 %, the film thickness is 80 ⁇ m, the pencil hardness is 2H, the adhesion measured by the circle method is level 2, the surface static water contact angle is 90-100°, the neutral salt spray test can only withstand the neutral salt spray test of 300-400h . Therefore, the anti-corrosion coating of the circuit board with the anti-corrosion coating obtained by the method of the present invention has high adhesion, good hydrophobic performance, good long-term waterproof performance, strong corrosion resistance, high coating transparency and small thickness.
  • the circuit board with anti-corrosion coating obtained in the present invention has been tested by neutral salt spray for 1500h, and the surface of the circuit board only shows slight corrosion at the tip of the solder.
  • the rectangular area is the corrosion area, and the anti-corrosion coating
  • FIG 2 after the neutral salt spray test for 300-400h of the control sample, more pits and pits appeared on the surface of the circuit board, and the corrosion products were corroding. The accumulation of pits is obvious, and the rectangular area is a corroded area.
  • the circuit board with anticorrosive coating of the present invention uses the rough structure of the hydrophobic surface to trap air, reduces the contact area between droplets and the surface, and prevents the penetration and diffusion of corrosive media;
  • the super-hydrophobic nano powder in the UV nano anticorrosive coating can effectively hinder and prolong the penetration and diffusion path of the medium in the UV nano anticorrosive coating;
  • the antirust agent in the UV nano anticorrosive coating can react with corrosive media to prevent The corrosive medium further penetrates and corrodes the circuit board; under the action of multiple anti-corrosion mechanisms, the prepared anti-corrosion coating shows good corrosion resistance.
  • the advantages and positive effects of the present invention are: the UV nano anticorrosive coating of the present invention takes UV resin and acrylate monomer as the main components and adds super-hydrophobic nano powder and rust inhibitor, It is coated on the surface of the circuit board as a top coat, which can effectively hinder the penetration and diffusion of corrosive media, thereby improving the corrosion resistance of the circuit board; the present invention also uses chlorinated polyolefin as a primer to coat the surface of the circuit board , Not only improves the anti-corrosion and anti-corrosion performance of the coating, but also increases the adhesion of the coating; the circuit board with anti-corrosion coating has high transparency, small thickness, good solvent resistance, high adhesion, and heavy weight.
  • Coating has little effect on the performance of the circuit board itself, and the preparation method is suitable for circuit boards of different materials.
  • the preparation process is simple, easy to operate, low in cost, can be constructed in a large area, and has huge application prospects in the field of white home appliances and electronic products.
  • the circuit board with the anticorrosive coating of the present invention can withstand a 1500h neutral salt spray test. After the 1500h neutral salt spray test, the coating has no bubbling detachment phenomenon.

Abstract

一种UV纳米防腐涂料、所得电路板及制备方法和应用。具有防腐涂层的电路板包括电路板（1）、底漆涂层（2）和UV纳米防腐涂料层（3），UV纳米防腐涂料层（3）包括以下重量份的原料制备而成：UV树脂20-40份，丙烯酸酯单体20-40份，引发剂3-8份，防锈剂（5）0.5-2份，超疏水纳米粉体（4）1-5份，助剂1-5份。上述UV纳米防腐涂料层（3）的制备方法。UV纳米防腐涂料层配方科学，电路板防腐涂层设计合理，附着力高，疏水性能好，有效阻止了液滴和腐蚀性介质（6）向电路板（1）的渗透，长期防水性能好，耐蚀能力强，制备方法简单，操作方便，对设备要求低，易于实现产业化，特别适用于沿海或近海地区白色家电和电子产品。

Description

一种UV纳米防腐涂料、所得电路板及制备方法和应用 技术领域
本发明属于防腐涂料的技术领域，特别是指一种电路板用UV纳米防腐涂料、所得涂层及制备方法和应用。
 背景技术
白色家电和电子产品等的电路板在使用过程中，通常会处于潮湿、多尘、盐雾和高温等环境中，特别是在沿海或近海地区使用的白色家电和电子产品，其电路板一类的电子元器件很容易发生霉变和腐蚀等问题，进而导致电路板出现故障，降低了白色家电和电子产品的可靠性，缩短了元器件的使用寿命。目前，现有技术中通常是采用在电路板表面涂覆三防漆的方式来提高电路板的防水、防霉和耐蚀性能。虽然，现有三防漆具有一定的三防性能，但是，其表面的亲水特性使得液滴和灰尘等易于在电路板的表面吸附且不易脱附，导致涂层长期防水、防介质渗透和防尘抗菌效果差；而且，三防漆不耐溶剂、耐候性差、重涂性差，在涂层制备过程中固化速度慢和VOC排放高。
近年来，超疏水表面由于其表面的特殊润湿性，在防水防油防尘和耐蚀等方面表现出优异的综合性能，被广泛地应用于材料的抗菌防蚀、集水和油水分离等领域。研究表明，暴露在环境中的超疏水表面的微米和纳米结构截留的大量空气可以大大减小腐蚀性介质与表面的接触面积、阻碍介质的渗透和扩散，从而有效地提高物理屏障效应并抑制腐蚀萌生的发展进程。灰尘的沉积会影响电路板的热量散发使电路板温度升高烧坏元件，也能够吸收水分腐蚀电路板。超疏水表面的防尘自清洁特性，可以长期有效地防止灰尘在电路板表面的吸附和堆积，从而避免积尘带来的不利影响。超疏水表面的特殊浸润性和低黏附性可以有效推迟液滴等在表面的吸附积聚，而且，吸附液滴在表面呈球状，易于脱落，使得水滴难以在表面长时间停留并向基材渗透；同时，可以阻止水膜和水桥的形成，避免电路板散热不畅和细菌滋生问题。
现有技术中也出现了一些用于电路板的疏水涂层，这种疏水涂层的配方设计不合理而且多是采用单一喷涂的方式制备而成的，该疏水涂层表面黏附性较大，不利于液滴的快速脱落，长期防水性能较差；而且，长期在高湿环境下，由于水渗入涂层的多孔结构中，易造成涂层疏水性失效，甚至涂层鼓泡脱落；涂层缺少能够有效提高电路板耐腐蚀性能和耐久性的中间层，不利于阻止液滴和腐蚀性介质向电路板的渗透和长期使用效能；另外，这种疏水涂层的制备方法较为复杂，对设备要求高，难以实现大规模生产。
 技术问题
本发明的目的在于提供一种电路板用UV纳米防腐涂料，旨在解决现有技术中电路板用疏水涂层存在表面黏附性大而导致其疏水性易失效和长期防水性能差以及其制备方法复杂和对设备要求高而导致其难以实现大规模生产的问题。
 技术解决方案
为了解决上述技术问题，本发明采用下述技术方案予以实现：
在一个方面，本发明的一种UV纳米防腐涂料，包括以下重量份的原料：UV树脂20-40份，丙烯酸酯单体20-40份，引发剂3-8份，防锈剂0.5-2份，超疏水纳米粉体1-5份，助剂1-5份。
本发明的UV纳米防腐涂料包括UV树脂、丙烯酸酯单体、引发剂、防锈剂、超疏水纳米粉体和助剂，配方设计科学，各原料组分相辅相成，在超疏水纳米粉体的协同作用下，所得UV纳米防腐涂料无溶剂，涂覆之后，流平性好，UV光照条件下，可快速固化，所得的UV纳米防腐涂层透明、高光、高硬、耐溶剂性好、附着力高、可重涂、耐蚀性能强，特别是疏水性能好，能够有效阻止液滴和腐蚀性介质向电路板的渗透，长期防水性能好，可满足沿海或近海地区白色家电和电子产品等电路板的防腐要求。本发明的UV树脂又称光敏树脂，是一种受光线照射后，能在较短的时间内迅速发生物理和化学变化，进而交联固化的低聚物，UV树脂是一种相对分子质量较低的感光性树脂，具有可进行UV的反应性基团，如不饱和双键或环氧基等，UV树脂是UV涂料的基体树脂，它与光引发剂，活性稀释剂以及各种助剂复配，即构成UV涂料。
可选地，所述超疏水纳米粉体包括以下重量份的原料：纳米硅溶胶1-15份，氨水2-10份，去离子水6-16份，正硅酸四乙酯0.1-1份，长链硅氧烷或氟硅烷0.1-2份，无水乙醇60-100份。本发明的超疏水纳米粉体是纳米硅溶胶在氨水溶液、去离子水和无水乙醇中经过正硅酸四乙酯和长链硅氧烷或氟硅烷的作用制备而成的，氨水优选使用质量浓度为35%的氨水，无水乙醇还可以用无水甲醇或无水异丙醇来替代，这种超疏水纳米粉体疏水性能好，具有优异的超疏水及超疏油性能，可用于自清洁、抗结露结霜、防腐蚀表面，易于均匀分散，制备工艺简单，适合工业化生产。
可选地，所述UV树脂为UV环氧丙烯酸酯、UV环氧树脂、UV聚酯丙烯酸酯、UV脂肪族聚氨酯、UV聚氨酯丙烯酸酯和UV有机硅树脂中的任意一种或几种。本发明的UV树脂可选择的种类较多，这种UV树脂的来源广，价廉易得，使用方便；这些UV树脂可快速固化，性能可调整性好；100%固含，无有机溶剂释放，环境友好；可以制成高耐候性、高弹性、高硬度、高附着力的涂料；具有很高的固含量，一次涂装即可得到性能优异的涂膜，而且易于施工、保护和装饰作用明显。
可选地，所述丙烯酸酯单体为二缩三丙二醇二丙烯酸酯、季戊四醇三丙烯酸酯、三羟甲基丙烷三丙烯酸酯、邻苯二甲酸二甘醇二丙烯烯酸酯、新戊二醇二丙烯酸酯中的任意一种或几种。本发明的丙烯酸酯单体以丙烯酸酯为主，可以是脂肪族，也可以是芳香族，还可以是经过烷基氧化的丙烯酸酯，这些丙烯酸酯单体具有粘度低、稀释能力强、挥发性低、高闪点及易溶的特点，作为单体用于UV涂料中，与丙稀酸类预聚合体有良好的相溶性，可赋予光固化涂膜较好的柔韧性和稳定性，增强涂膜附着力和改进柔韧性。
可选地，所述助剂包括流平剂和催干剂，所述流平剂为有机硅流平剂和丙烯酸酯流平剂中的任意一种或几种，所述催干剂为醋酸铅、硫酸锰、氯化锰和醋酸钴中的任意一种或几种。本发明以有机硅类和丙烯酸酯类作为流平剂，流平效果好，可以更好地与原料中的UV树脂和丙烯酸酯单体融合，降低了涂料的表面张力，提高了涂层覆盖性，使成膜均匀；本发明以醋酸铅、硫酸锰、氯化锰和醋酸钴作为催干剂，催干剂的使用加速了涂层的固化。
优选地，所述引发剂为安息香、二苯基乙酮、芳酰基膦氧化物、二苯甲酮、二芳基碘鎓盐、三芳基硫鎓盐中的任意一种或几种。本发明中助剂的添加可以有效降低涂料表面张力，提高涂层覆盖性，使成膜均匀且自然，加快涂料的固化。
优选地，所述防锈剂为RT-941防锈剂。本发明中防锈剂为RT-941系列防锈剂，这种防锈剂防锈效果好，价廉易得，使用方便。
在再一个方面，本发明的一种电路板用UV纳米防腐涂料的制备方法，包括以下步骤：取UV树脂、丙烯酸酯单体、引发剂、防锈剂、超疏水纳米粉体和助剂，混合，连续搅拌1-2h，得UV纳米防腐涂料。本发明的UV纳米防腐涂料的制备方法简单，只需要将原料混合并搅拌即得，操作方便，对设备要求低，固化速度快，零VOC排放，符合节能减排和绿色生产的要求，易于实现产业化。
可选地，所述超疏水纳米粉体的制备方法为：取纳米硅溶胶1-15份、氨水2-10份、去离子水6-16份、正硅酸四乙酯0.1-1份、长链硅氧烷或氟硅烷0.1-2份和无水乙醇60-100份，混合，连续搅拌12-48 h，得超疏水纳米粉体溶液；将超疏水纳米粉体溶液过滤，干燥，得超疏水纳米粉体。本发明的超疏水纳米粉体是将纳米硅溶胶、氨水、去离子水、正硅酸四乙酯和长链硅氧烷或氟硅烷分散在无水乙醇中，经过混合、搅拌、过滤和干燥而得到的，本发明中还可以是连续机械搅拌6-8h后，放置3-5天，过滤可以是离心过滤分离，制备方法简单，操作方便，对设备要求低，易于实现产业化。
在另一个方面，本发明的一种具有防腐涂层的电路板，包括电路板、底漆涂层和UV纳米防腐涂料层，所述底漆涂层位于所述电路板的表面上，所述底漆涂层是氯化聚烯烃涂层、高氯化聚乙烯涂层、氯化聚丙烯涂层中的任意一种；所述UV纳米防腐涂料层位于所述底漆涂层的表面上，所述UV纳米防腐涂料层是根据上面所述的UV纳米防腐涂料涂覆之后固化而成的。
本发明的具有防腐涂层的电路板上的防腐涂层是由底漆涂层和UV纳米防腐涂料层有机组合而成，底漆涂层的存在可以提高涂层与电路板的粘接力，采用含有超疏水纳米粉体的UV纳米防腐涂料作为面漆进行多层多道次涂覆，涂覆的方式可以为刷涂、喷涂或浸涂；所得的防腐涂层的膜厚为10-30μm，可见光透光率为90%，铅笔硬度为3H，划圈法测定附着力为0级，水接触角在100°以上，可重涂2次以上，耐中性盐雾1500h以上；可以有效地阻止或延缓液滴和腐蚀性介质向电路板的渗透和扩散，从而提高了电路板的耐蚀性能，可应用于潮湿、多尘和盐雾环境中，能够满足沿海或近海地区白色家电、电子产品等电路板的防腐需求。
在又一个方面，本发明的一种具有防腐涂层的电路板的制备方法，包括以下步骤：取电路板，清洗，烘干；在电路板的表面上均匀涂覆氯化聚烯烃溶液形成底漆，常温放置3-5min，使底漆半固化，得底漆涂层；将根据上面所述的UV纳米防腐涂料的制备方法所得的UV纳米防腐涂料均匀涂覆于底漆涂层的表面上，紫外光固化，紫外光的强度为600-800MJ/cm 2，照射时间为1-2s，得具有防腐涂层的电路板。
本发明的具有防腐涂层的电路板的制备方法是将电路板经过清洗和烘干之后，先涂覆一层氯化聚烯烃溶液形成底漆涂层，再涂覆UV纳米防腐涂料形成UV纳米防腐涂料层，其工艺流程短，操作方便，对设备无特殊要求，固化时间短，生产效率高，易于实现产业化。
在还一个方面，本发明的一种具有防腐涂层的电路板的应用，所述具有防腐涂层的电路板用于白色家电或电子产品中。本发明的具有防腐涂层的电路板附着力高，疏水性能好，能够有效阻止液滴和腐蚀性介质向电路板的渗透，长期防水性能好，特别适用于沿海或近海地区白色家电和电子产品中。
 有益效果
与现有技术相比，本发明的优点和积极效果是：本发明的UV纳米防腐涂料以UV树脂和丙烯酸酯单体为主要成分并添加有超疏水纳米粉体和防锈剂，将其作为面漆涂覆在电路板表面，可有效地阻碍腐蚀性介质的渗透和扩散，从而提高了电路板的耐蚀性能；本发明还使用氯化聚烯烃作为底漆涂覆在电路板表面，不仅提高了涂层的防腐耐蚀性能，而且增加了涂层的附着力；该具有防腐涂层的电路板的涂层透明性高、厚度小、耐溶剂性好、附着力高、可重涂，对电路板本身性能影响小，而且该制备方法适用于不同材质的电路板，制备工艺简单、易操作、成本低廉，可大面积施工，在白色家电和电子产品领域具有巨大的应用前景。本发明的具有防腐涂层的电路板可经受1500h的中性盐雾试验，在1500h中性盐雾试验后，涂层未出现鼓泡脱离现象。
 附图说明
图1为本发明实施例一所得的具有防腐涂层的电路板经中性盐雾1500h测试后的光学图片；
图2为本发明所列出的对照样经中性盐雾1500h测试后的光学图片；
图3为本发明实施例一所得的具有防腐涂层的电路板的防腐涂层的附着力测试效果图；
图4为本发明所列出的对照样的疏水涂层的附着力测试效果图；
图5为本发明实施例一所得的具有防腐涂层的电路板的防腐涂层的硬度测试效果图；
图6为本发明所列出的对照样的疏水涂层的的硬度测试效果图；
图7为本发明的具有防腐涂层的电路板的防腐过程一示意图；
图8为本发明的具有防腐涂层的电路板的防腐过程二示意图；
图中：1-电路板；2-底漆涂层；3-UV纳米防腐涂层；4-超疏水纳米粉体；5-防锈剂；6-腐蚀性介质；7-中和产物。
 本发明的最佳实施方式
下面将结合本发明的具体实施例对本发明的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
本发明的一种UV纳米防腐涂料，包括以下重量份的原料：UV树脂20-40份，丙烯酸酯单体20-40份，引发剂3-8份，防锈剂0.5-2份，超疏水纳米粉体1-5份，助剂1-5份。
优选地，所述超疏水纳米粉体包括以下重量份的原料：纳米硅溶胶1-15份，氨水2-10份，去离子水6-16份，正硅酸四乙酯0.1-1份，长链硅氧烷或氟硅烷0.1-2份，无水乙醇60-100份。
进一步地，所述UV树脂为UV环氧丙烯酸酯、UV环氧树脂、UV聚酯丙烯酸酯、UV脂肪族聚氨酯、UV聚氨酯丙烯酸酯和UV有机硅树脂中的任意一种或几种。
具体地，所述丙烯酸酯单体为二缩三丙二醇二丙烯酸酯、季戊四醇三丙烯酸酯、三羟甲基丙烷三丙烯酸酯、邻苯二甲酸二甘醇二丙烯烯酸酯、新戊二醇二丙烯酸酯中的任意一种或几种。
再次优选地，所述助剂包括流平剂和催干剂，所述流平剂为有机硅流平剂和丙烯酸酯流平剂中的任意一种或几种，所述催干剂为醋酸铅、硫酸锰、氯化锰和醋酸钴中的任意一种或几种；优选地，所述引发剂为安息香、二苯基乙酮、芳酰基膦氧化物、二苯甲酮、二芳基碘鎓盐、三芳基硫鎓盐中的任意一种或几种；优选地，所述防锈剂为RT-941防锈剂。
本发明的一种电路板用UV纳米防腐涂料的制备方法，包括以下步骤：取UV树脂、丙烯酸酯单体、引发剂、防锈剂、超疏水纳米粉体和助剂，混合，连续搅拌1-2h，得UV纳米防腐涂料。
优选地，所述超疏水纳米粉体的制备方法为：取纳米硅溶胶1-15份、35%wt氨水2-10份、去离子水6-16份、正硅酸四乙酯0.1-1份、长链硅氧烷或氟硅烷0.1-2份和无水乙醇60-100份，混合，连续搅拌12-48 h，得超疏水纳米粉体溶液；将超疏水纳米粉体溶液过滤，干燥，得超疏水纳米粉体。
本发明的一种具有防腐涂层的电路板，包括电路板、底漆涂层和UV纳米防腐涂料层，所述底漆涂层位于所述电路板的表面上，所述底漆涂层是氯化聚烯烃涂层、高氯化聚乙烯涂层、氯化聚丙烯涂层中的任意一种；所述UV纳米防腐涂料层位于所述底漆涂层的表面上，所述UV纳米防腐涂料层是根据上面所述的UV纳米防腐涂料涂覆之后固化而成的。
本发明的一种具有防腐涂层的电路板的制备方法，包括以下步骤：取电路板，清洗，烘干；在电路板的表面上均匀涂覆氯化聚烯烃溶液形成底漆，常温放置3-5min，使底漆半固化，得底漆涂层；将根据上面所述的UV纳米防腐涂料的制备方法所得的UV纳米防腐涂料均匀涂覆于底漆涂层的表面上，紫外光固化，紫外光的强度为600-800MJ/cm 2，照射时间为1-2s，得具有防腐涂层的电路板。
本发明的一种具有防腐涂层的电路板的应用，所述具有防腐涂层的电路板用于白色家电或电子产品中。
 本发明的实施方式
实施例一
本发明的一种具有防腐涂层的电路板的制备方法，包括以下步骤：
1）超疏水纳米粉体的制备：取纳米硅溶胶8份、35%wt氨水6份、去离子水12份、正硅酸四乙酯0.5份、长链硅氧烷0.5份和无水乙醇80份，混合，连续机械搅拌24h，得超疏水纳米粉体溶液；将超疏水纳米粉体溶液离心过滤，干燥，得超疏水纳米粉体；
2）UV纳米防腐涂料的配制：将UV环氧丙烯酸酯35份、二缩三丙二醇二丙烯酸酯30份、引发剂安息香6份、防锈剂RT-941 1份、步骤1）所得的超疏水纳米粉体4份、有机硅流平剂1份和氯化锰1份，混合，连续机械搅拌2 h，得UV纳米防腐涂料；
3）取电路板，清洗，烘干；
4）在电路板的表面上均匀涂覆氯化聚烯烃溶液形成底漆，常温放置4min，使底漆半固化，得底漆涂层；
5）将步骤2）所得的UV纳米防腐涂料均匀涂覆于底漆涂层的表面上，紫外光固化，紫外光的强度为600MJ/cm 2，照射时间为2s，得具有防腐涂层的电路板。
实施例二
本发明的一种具有防腐涂层的电路板的制备方法，包括以下步骤：
1）超疏水纳米粉体的制备：取纳米硅溶胶1份、35%wt氨水2份、去离子水6份、正硅酸四乙酯0.1份、氟硅烷0.1份和无水乙醇60份，混合，连续机械搅拌12h，得超疏水纳米粉体溶液；将超疏水纳米粉体溶液离心过滤，干燥，得超疏水纳米粉体；
2）UV纳米防腐涂料的配制：将UV聚酯丙烯酸酯20份、季戊四醇三丙烯酸酯20份、引发剂二苯基乙酮3份、RT-941系列防锈剂0.5份、步骤1）所得的超疏水纳米粉体1份、丙烯酸酯流平剂1份，混合，连续机械搅拌1 h，得UV纳米防腐涂料；
3）取电路板，清洗，烘干；
4）在电路板的表面上均匀涂覆高氯化聚乙烯溶液形成底漆，常温放置3min，使底漆半固化，得底漆涂层；
5）将步骤2）所得的UV纳米防腐涂料均匀涂覆于底漆涂层的表面上，紫外光固化，紫外光的强度为800MJ/cm 2，照射时间为1s，得具有防腐涂层的电路板。
实施例三
本发明的一种具有防腐涂层的电路板的制备方法，包括以下步骤：
1）超疏水纳米粉体的制备：取纳米硅溶胶15份、35%wt氨水10份、去离子水16份、正硅酸四乙酯1份、长链硅氧烷2份和无水乙醇100份，混合，连续机械搅拌48 h，得超疏水纳米粉体溶液；将超疏水纳米粉体溶液过滤，干燥，得超疏水纳米粉体；
2）UV纳米防腐涂料的配制：将UV聚酯丙烯酸酯40份、三羟甲基丙烷三丙烯酸酯40份、引发剂芳酰基膦氧化物8份、RT-941系列防锈剂2份、步骤1）所得的超疏水纳米粉体5份和醋酸铅5份，混合，连续机械搅拌2 h，得UV纳米防腐涂料；
3）取电路板，清洗，烘干；
4）在电路板的表面上均匀涂覆氯化聚丙烯溶液形成底漆，常温放置5min，使底漆半固化，得底漆涂层；
5）将步骤2）所得的UV纳米防腐涂料均匀涂覆于底漆涂层的表面上，紫外光固化，紫外光的强度为700MJ/cm 2，照射时间为2s，得具有防腐涂层的电路板。
将实施例一至实施例三所得的三份具有防腐涂层的电路板分别进行可见光透光率、膜厚度、铅笔硬度和附着力测试实验，并以现有的具有疏水涂层的电路板为对照样，将对照样也在相同的条件下进行可见光透光率、膜厚度、铅笔硬度和附着力测试实验；其中，可见光透光率的测定方法是采用紫外可见分光光度计测量涂层透光率，测试波长范围350-800nm；膜厚度的测定方法是采用涂膜测厚仪进行膜厚测量；铅笔硬度的测定方法是参照GB/T 6739-1996《涂膜硬度铅笔测定法》；附着力的测定方法是参照GB/T 1720-1979(1989)《漆膜附着力测定法》，实验结果如表1所示。
表1 不同电路板的性能测试实验结果
Figure 421917dest_path_image001
由表1可以看出，本发明的方法所得的具有防腐涂层的电路板的防腐涂层的可见光透光率均在80%以上，其膜厚在30-70μm之间，铅笔硬度均为3H，划圈法测定附着力均在2级以上，表面静态水接触角均大于100°，可经受1000h以上的中性盐雾试验；然而，对照样的疏水涂层的可见光透光率仅为75%，膜厚为80μm，铅笔硬度为2H，划圈法测定附着力为2级，表面静态水接触角为90-100°，中性盐雾试验仅能够经受300-400h的中性盐雾试验。因此，本发明的方法所得的具有防腐涂层的电路板的防腐涂层附着力高，疏水性能好，长期防水性能好，耐蚀能力强，涂层透明性高，厚度小。
参阅附图1，本发明所得的具有防腐涂层的电路板经中性盐雾1500h测试后，其电路板表面只在焊锡尖端部位出现轻微的腐蚀现象，矩形区域为腐蚀区域，并且，防腐涂层未出现鼓泡脱离现象；然而，参阅附图2，对照样在中性盐雾试验300-400h后，在其电路板的表面即出现了较多的蚀点和蚀坑，腐蚀产物在蚀坑处积聚明显，矩形区域为腐蚀区域。参阅附图3本发明所得的具有防腐涂层的电路板的防腐涂层在划圈法测定附着力时，其附着力较大，均为2级以上；然而，参阅附图4，对照样的疏水涂层在划圈法测定附着力时，其附着力较小，仅为2级。参阅附图5，本发明所得的具有防腐涂层的电路板的防腐涂层的硬度测试效果表明其铅笔硬度为3H，硬度大；然而，参阅附图6，对照样的疏水涂层的硬度测试效果表明其铅笔硬度仅为 2 H，硬度小。参阅附图7和附图8，这是因为本发明的具有防腐涂层的电路板利用疏水表面的粗糙结构截留空气，减少了液滴与表面的接触面积，阻碍了腐蚀介质的渗透和扩散；UV纳米防腐涂层中的超疏水纳米粉体可以有效阻碍和延长介质在UV纳米防腐涂层内的渗透和扩散路径；该UV纳米防腐涂层中的防锈剂可与腐蚀性介质反应，防止腐蚀性介质进一步渗透并腐蚀电路板；在多重防腐机制的作用下，所制备防腐涂层表现出良好的耐蚀性能。
 工业实用性
因此，与现有技术相比，本发明的优点和积极效果是：本发明的UV纳米防腐涂料以UV树脂和丙烯酸酯单体为主要成分并添加有超疏水纳米粉体和防锈剂，将其作为面漆涂覆在电路板表面，可有效地阻碍腐蚀性介质的渗透和扩散，从而提高了电路板的耐蚀性能；本发明还使用氯化聚烯烃作为底漆涂覆在电路板表面，不仅提高了涂层的防腐耐蚀性能，而且增加了涂层的附着力；该具有防腐涂层的电路板的涂层透明性高、厚度小、耐溶剂性好、附着力高、可重涂，对电路板本身性能影响小，而且该制备方法适用于不同材质的电路板，制备工艺简单、易操作、成本低廉，可大面积施工，在白色家电和电子产品领域具有巨大的应用前景。本发明的具有防腐涂层的电路板可经受1500h的中性盐雾试验，在1500h中性盐雾试验后，涂层未出现鼓泡脱离现象。
以上实施例仅用以说明本发明的技术方案，而非对其进行限制；尽管参照前述实施例对本发明进行了详细的说明，对于本领域的普通技术人员来说，依然可以对前述实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或替换，并不使相应技术方案的本质脱离本发明所要求保护的技术方案的精神和范围。

Claims (10)

  1. 一种UV纳米防腐涂料，其特征在于，包括以下重量份的原料：
    UV树脂20-40份，丙烯酸酯单体20-40份，引发剂3-8份，防锈剂0.5-2份，超疏水纳米粉体1-5份，助剂1-5份。
  2. 根据权利要求1所述的UV纳米防腐涂料，其特征在于，所述超疏水纳米粉体包括以下重量份的原料：
    纳米硅溶胶1-15份，氨水2-10份，去离子水6-16份，正硅酸四乙酯0.1-1份，长链硅氧烷或氟硅烷0.1-2份，无水乙醇60-100份。
  3. 根据权利要求1所述的UV纳米防腐涂料，其特征在于：
    所述UV树脂为UV环氧丙烯酸酯、UV环氧树脂、UV聚酯丙烯酸酯、UV脂肪族聚氨酯、UV聚氨酯丙烯酸酯和UV有机硅树脂中的任意一种或几种。
  4. 根据权利要求1所述的UV纳米防腐涂料，其特征在于：
    所述丙烯酸酯单体为二缩三丙二醇二丙烯酸酯、季戊四醇三丙烯酸酯、三羟甲基丙烷三丙烯酸酯、邻苯二甲酸二甘醇二丙烯烯酸酯、新戊二醇二丙烯酸酯中的任意一种或几种。
  5. 根据权利要求1-4中任意一项所述的UV纳米防腐涂料，其特征在于：
    所述助剂包括流平剂和催干剂，所述流平剂为有机硅流平剂和丙烯酸酯流平剂中的任意一种或几种，所述催干剂为醋酸铅、硫酸锰、氯化锰和醋酸钴中的任意一种或几种；
    所述引发剂为安息香、二苯基乙酮、芳酰基膦氧化物、二苯甲酮、二芳基碘鎓盐、三芳基硫鎓盐中的任意一种或几种；
    所述防锈剂为RT-941防锈剂。
  6. 一种根据权利要求1-5中任意一项所述的UV纳米防腐涂料的制备方法，其特征在于，包括以下步骤：
    取UV树脂、丙烯酸酯单体、引发剂、防锈剂、超疏水纳米粉体和助剂，混合，连续搅拌1-2h，得UV纳米防腐涂料。
  7. 根据权利要求6所述的UV纳米防腐涂料的制备方法，其特征在于，所述超疏水纳米粉体的制备方法为：
    取纳米硅溶胶1-15份、氨水2-10份、去离子水6-16份、正硅酸四乙酯0.1-1份、长链硅氧烷或氟硅烷0.1-2份和无水乙醇60-100份，混合，连续搅拌12-48 h，得超疏水纳米粉体溶液；
    将超疏水纳米粉体溶液过滤，干燥，得超疏水纳米粉体。
  8. 一种具有防腐涂层的电路板，其特征在于，包括：
    电路板；
    底漆涂层，其位于所述电路板的表面上，所述底漆涂层是氯化聚烯烃涂层、高氯化聚乙烯涂层、氯化聚丙烯涂层中的任意一种；
    UV纳米防腐涂料层，其位于所述底漆涂层的表面上，所述UV纳米防腐涂料层是根据权利要求1-5中任意一项所述的UV纳米防腐涂料涂覆之后固化而成的。
  9. 一种具有防腐涂层的电路板的制备方法，其特征在于，包括以下步骤：
    取电路板，清洗，烘干；
    在电路板的表面上均匀涂覆氯化聚烯烃溶液形成底漆，常温放置3-5min，使底漆半固化，得底漆涂层；
    将根据权利要求6或7所述的UV纳米防腐涂料的制备方法所得的UV纳米防腐涂料均匀涂覆于底漆涂层的表面上，紫外光固化，紫外光的强度为600-800MJ/cm 2，照射时间为1-2s，得具有防腐涂层的电路板。
  10. 根据权利要求8所述的具有防腐涂层的电路板的应用，其特征在于：
    所述具有防腐涂层的电路板用于白色家电或电子产品中。
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