WO2021031673A1 - Uv nano anticorrosive coating, circuit board obtained by using same, and preparation method and application - Google Patents

Abstract

A UV nano anticorrosive coating, a circuit board obtained by using same, and a preparation method and an application. The circuit board having an anticorrosive coating comprises a circuit board (1), a primer coating (2), and a UV nano anticorrosive coating layer (3). The UV nano anticorrosive coating layer (3) comprises the following raw materials in parts by weight: 20-40 parts of a UV resin, 20-40 parts of an acrylate monomer, 3-8 parts of an initiator, 0.5-2 parts of an antirusting agent (5), 1-5 parts of superhydrophobic nano powder (4), and 1-5 parts of an auxiliary. Provided is a preparation method for the UV nano anticorrosive coating layer (3). The UV nano anticorrosive coating layer has a scientific formulation, the circuit board anticorrosive coating has a reasonable design, has high adhesion and good hydrophobic performance, effectively prevents the penetration of droplets and a corrosive medium (6) into the circuit board (1), and has good long-term waterproof performance and high corrosion resistance, the preparation method is simple, easy to operate, has low apparatus requirements, is easy to implement industrialization, and is especially suitable for white goods and electronic products in coastal or offshore areas.

Description

UV nano anticorrosive coating, obtained circuit board, preparation method and application Technical field

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.

Background technique

The circuit boards of white goods and electronic products are usually exposed to humid, dusty, salt spray and high temperature environments during use. Especially 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. At present, in the prior art, 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. Although 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.

In recent years, due to the special wettability of the surface, 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. Moreover, 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.

Some 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. Moreover, in a long-term high-humidity environment, due to the penetration of water into the porous structure of the coating, it is easy to cause the hydrophobicity of the coating to fail, and even the coating bubbling off; The lack of an intermediate layer that can effectively improve the corrosion resistance and durability of the circuit board is not conducive to preventing the penetration of droplets and corrosive media into the circuit board and the long-term use efficiency; in addition, the preparation method of this hydrophobic coating is more complicated and impairs the equipment The requirements are high and it is difficult to achieve mass production.

technical problem

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.

Technical solutions

In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve:

In one aspect, 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. Under the action, 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. High, recoatable, strong corrosion resistance, especially good hydrophobic performance, can effectively prevent the penetration of liquid droplets and corrosive media into the circuit board, and has good long-term waterproof performance, which can meet the requirements of white goods and electronic products in coastal or offshore areas Anti-corrosion requirements of the board. 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. Low photosensitive resin, with reactive groups capable of UV, such as unsaturated double bonds or epoxy groups, etc. 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.

Optionally, 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.

Optionally, 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.

Optionally, 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.

Optionally, 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, and 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.

Preferably, 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.

Preferably, 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.

In another aspect, 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.

Optionally, 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.

In another aspect, 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 10-30μm , 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°, it can be repainted more than 2 times, and 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.

In yet another aspect, 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.

In another aspect, 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.

Beneficial effect

Compared with the prior art, 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 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. It has little impact 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 fields 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.

Description of the drawings

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;

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;

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;

7 is a schematic diagram of the anti-corrosion process of the circuit board with anti-corrosion coating of the present invention;

8 is a second schematic diagram of the anti-corrosion process of the circuit board with anti-corrosion coating of the present invention;

In the picture: 1-circuit board; 2-primer coating; 3-UV nano anticorrosive coating; 4-superhydrophobic nano powder; 5-anti-rust agent; 6-corrosive medium; 7-neutralized product.

The best mode of the invention

The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope 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.

Preferably, 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.

Further, 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.

Specifically, the acrylate monomer is tripropylene glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, diethylene glycol diacrylate phthalate, neopentyl glycol diacrylate Any one or more of acrylates.

Preferably again, 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, and the drier is lead acetate , Manganese sulfate, manganese chloride and cobalt acetate; preferably, the initiator is benzoin, diphenyl ethyl ketone, aroyl phosphine oxide, benzophenone, diaryl iodide Any one or more of onium salt and triarylsulfonium salt; preferably, 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.

Preferably, 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.

The application of a circuit board with an anti-corrosion coating of the present invention is used in white home appliances or electronic products.

Embodiments of the invention

Example one

The method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps:

1) Preparation of superhydrophobic nano powder: take 8 parts of nano silica sol, 6 parts of 35%wt ammonia water, 12 parts of deionized water, 0.5 parts of tetraethylorthosilicate, 0.5 parts of long-chain siloxane, and absolute ethanol 80 parts, mixed and continuously mechanically stirred for 24 hours to obtain a superhydrophobic nano powder solution; centrifuge the superhydrophobic nano powder solution and dry to obtain a superhydrophobic nano powder;

2) Preparation of 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;

3) Take the circuit board, clean and dry;

4) Evenly coat the chlorinated polyolefin solution on the surface of the circuit board to form a primer, and place it at room temperature for 4 minutes to make the primer semi-cured to obtain a primer coating;

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 , and the irradiation time is 2s to obtain a circuit with anticorrosive coating. board.

Example two

The method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps:

1) Preparation of superhydrophobic nano powder: take 1 part of nano silica sol, 2 parts of 35%wt ammonia water, 6 parts of deionized water, 0.1 part of tetraethylorthosilicate, 0.1 part of fluorosilane and 60 parts of anhydrous ethanol, Mix and stir continuously for 12 hours to obtain superhydrophobic nano powder solution; centrifuge the superhydrophobic nano powder solution and dry to obtain superhydrophobic nano powder;

2) Preparation of 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;

3) Take the circuit board, clean and dry;

4) Evenly coat the high chlorinated polyethylene solution on the surface of the circuit board to form a primer, and place it at room temperature for 3 minutes to make the primer semi-cured to obtain a primer coating;

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.

Example three

The method for preparing a circuit board with an anticorrosive coating of the present invention includes the following steps:

1) Preparation of superhydrophobic nano-powder: take 15 parts of nano silica sol, 10 parts of 35%wt ammonia water, 16 parts of deionized water, 1 part of tetraethylorthosilicate, 2 parts of long-chain siloxane and absolute ethanol 100 parts, mixed and continuously mechanically stirred for 48 hours to obtain superhydrophobic nano powder solution; filter and dry the superhydrophobic nano powder solution to obtain superhydrophobic nano powder;

2) Preparation of 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;

3) Take the circuit board, clean and dry;

4) Evenly coat the chlorinated polypropylene solution on the surface of the circuit board to form a primer, and place it at room temperature for 5 minutes to make the primer semi-cured to obtain a primer coating;

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 , and the irradiation time is 2s to obtain a circuit with an anticorrosive coating. board.

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 In the same way, 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.

Table 1 Performance test results of different circuit boards

It can be seen from Table 1 that 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 μm, and 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 80μm, 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.

Referring to Figure 1, 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 However, referring to Figure 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. Refer to Figure 3, when the anti-corrosion coating of the circuit board with anti-corrosion coating obtained in the present invention is measured for adhesion, its adhesion is relatively large, all of which are above level 2; however, refer to Figure 4, the control sample When the adhesion of the hydrophobic coating is measured by the circle method, its adhesion is relatively small, only Grade 2. Referring to Figure 5, the hardness test effect of the anti-corrosion coating of the circuit board with anti-corrosion coating obtained in the present invention shows that its pencil hardness is 3H, which is high; however, refer to Figure 6, the hardness test of the hydrophobic coating of the control sample The effect shows that the pencil hardness is only 2 H, and the hardness is small. Referring to Figures 7 and 8, this is because 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.

Industrial applicability

Therefore, compared with the prior art, 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.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, the technical solutions of the foregoing embodiments can still be described. The recorded technical solutions are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims (10)

1. A UV nano anticorrosive coating, characterized in that it comprises the following raw materials in parts by weight:

   20-40 parts of UV resin, 20-40 parts of acrylate monomer, 3-8 parts of initiator, 0.5-2 parts of rust inhibitor, 1-5 parts of superhydrophobic nano powder, 1-5 parts of additives.
2. The UV nano anticorrosive coating of claim 1, wherein the superhydrophobic nano powder comprises the following raw materials by weight:

   Nano silica sol 1-15 parts, ammonia water 2-10 parts, deionized water 6-16 parts, tetraethyl orthosilicate 0.1-1 parts, long-chain siloxane or fluorosilane 0.1-2 parts, anhydrous ethanol 60 -100 copies.
3. The UV nano anticorrosive coating according to claim 1, characterized in that:

   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.
4. The UV nano anticorrosive coating according to claim 1, characterized in that:

   The acrylate monomers are tripropylene glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, diethylene glycol dipropylene phthalate, and neopentyl glycol diacrylate. Any one or more of.
5. The UV nano anticorrosive coating according to any one of claims 1-4, characterized in that:

   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, and the drier is lead acetate, manganese sulfate, Any one or more of manganese chloride and cobalt acetate;

   The initiator is any one or more of benzoin, benzophenone, aroylphosphine oxide, benzophenone, diaryliodonium salt, and triarylsulfonium salt;

   The rust inhibitor is RT-941 rust inhibitor.
6. A preparation method of UV nano anticorrosive coating according to any one of claims 1-5, characterized in that it comprises the following steps:

   Take 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.
7. The preparation method of UV nano anticorrosive coating according to claim 6, wherein the preparation method of the superhydrophobic nano powder is:

   Take 1-15 parts of nano silica sol, 2-10 parts of ammonia, 6-16 parts of deionized water, 0.1-1 parts of tetraethylorthosilicate, 0.1-2 parts of long-chain siloxane or fluorosilane, and absolute ethanol 60-100 parts, mix, and continuously stir for 12-48 h to obtain superhydrophobic nano powder solution;

   The superhydrophobic nano powder solution is filtered and dried to obtain superhydrophobic nano powder.
8. A circuit board with anticorrosive coating, which is characterized in that it comprises:

   Circuit board

   A primer coating, which 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, and the UV nano anticorrosive coating layer is cured after coating the UV nano anticorrosive coating according to any one of claims 1-5 .
9. A method for preparing a circuit board with an anticorrosive coating is characterized in that it comprises the following steps:

   Take the circuit board, clean and dry;

   Coat the surface of the circuit board evenly with a chlorinated polyolefin solution to form a primer, and place it at room temperature for 3-5 minutes to make the primer semi-cured to obtain a primer coating;

   The UV nano anticorrosive coating obtained by the preparation method of the UV nano anticorrosive coating according to claim 6 or 7 is uniformly coated on the surface of the primer coating, and cured by ultraviolet light, and the intensity of the ultraviolet light is 600-800MJ/cm ² , The irradiation time is 1-2s, and the circuit board with anti-corrosion coating is obtained.
10. The application of the circuit board with anticorrosive coating according to claim 8, characterized in that:

    The circuit board with anticorrosive coating is used in white home appliances or electronic products.