A low outgassing UV moisture dual-curing conformal coating and its preparation method and application

Abstract

The present invention provides a low outgassing UV moisture dual-curing conformal paint and its preparation method and application. The raw materials for preparing the low outgassing UV moisture dual-curing conformal paint include the following components in parts by weight: 35 to 60 parts of acrylate oligomer, 10 to 30 parts of thermoplastic acrylic resin, 10 to 40 parts of acrylate monomer, 3 to 8 parts of photoinitiator and 0.5 to 3 parts of coupling agent. The low outgassing UV moisture dual-curing conformal paint provided in the present invention does not contain solvent, has a low volatile content, fast curing speed, high adhesion, and good weather resistance and chemical resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of conformal coatings, and in particular relates to a low-outgassing UV moisture dual-curing conformal coating and a preparation method and application thereof. Background Art

[0002] Conformal coating is a coating material with moisture-proof, mildew-proof, salt spray-proof and other protective functions, and is widely used in home appliances, automotive, aviation, electronic appliances and other fields. Conformal coating is applied to the surface of printed circuit boards (PCBs) and related discrete devices and integrated circuits. After curing, it can form a transparent protective film, which can effectively isolate the circuit board and protect the circuit board and related equipment from environmental erosion, which affects the quality and reliability of the printed circuit board.

[0003] CN115124919A discloses a high-performance, environment-friendly, conformal coating and a preparation method thereof. The high-performance, environment-friendly conformal coating comprises the following components in parts by mass: 50 to 70 parts of polyurethane-modified alkyd resin, 10 to 25 parts of acrylic acid-modified alkyd resin, 10 to 40 parts of solvent, 0.2 to 0.5 parts of fluorescent indicator, 1 to 5 parts of drying agent, 1 to 5 parts of anti-skinning agent and 1 to 5 parts of auxiliary agent. The conformal coating product provided by the technical solution not only has good paint film properties of alkyd resin, but also takes into account the excellent electrical insulation properties, moisture resistance, solvent resistance, salt spray corrosion resistance and other properties of polyurethane and the excellent gloss retention, color retention, water resistance and weather resistance of acrylic ester, and can effectively protect circuit boards.

[0004] CN115011230A discloses a polyurethane three-proof paint and a preparation method thereof, wherein the polyurethane three-proof paint is prepared from raw materials including the following components: 10 to 40 parts by weight of isocyanate-terminated silane, 5 to 40 parts by weight of film-forming resin solution, 30 to 70 parts by weight of solvent, and 0.01 to 1.5 parts by weight of catalyst; the isocyanate-terminated silane is prepared from isocyanate and aminosilane. The polyurethane three-proof paint provided by this technical solution adopts specific content components to achieve overall good interaction, has the characteristics of good high temperature resistance, no yellowing and good adhesion, and has low viscosity and fast surface drying, which is conducive to the coating of circuit boards.

[0005] The three-conformal paint currently used in the industry is mainly solvent-based, and the solvents used are generally volatile solvents, which have potential safety hazards. During the construction process, the volatilization of the solvent leads to a relatively harsh construction environment and also affects the health of the operators. The reason for adding solvents to the three-conformal paint is that, on the one hand, the viscosity of the original liquid is relatively large, which is not easy to operate during construction. The original liquid is diluted with solvents to reduce the viscosity of the system and improve operability; on the other hand, the viscosity of the three-conformal paint is relatively large, and the paint film is thick after coating, which will also lead to increased costs. Under the premise of not affecting the performance, reducing the viscosity of the three-conformal paint by dilution and reducing the coating thickness can reduce production costs.

[0006] As environmental protection requirements become increasingly stringent, more and more manufacturers are restricting the use of solvent-based conformal coatings. Therefore, it is necessary to develop a solvent-free, low-outgassing UV moisture dual-curing conformal coating that meets optical-grade VOC control. Summary of the invention

[0007] In view of the shortcomings of the prior art, the object of the present invention is to provide a low outgassing UV moisture dual-curing conformal coating and its preparation method and application. The low outgassing UV moisture dual-curing conformal coating does not contain solvent, has low volatile content, fast curing speed, high adhesion, and good weather resistance and chemical resistance.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a low outgassing UV moisture dual-curing conformal coating, wherein the low outgassing UV moisture dual-curing conformal coating comprises the following components in parts by weight: 35 to 60 parts (e.g., 37 parts, 40 parts, 43 parts, 46 parts, 49 parts, 52 parts, 55 parts or 58 parts), 10 to 30 parts (e.g., 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts or 28 parts) of an acrylate oligomer; parts, etc.), acrylate monomer 10-40 parts (for example, 13 parts, 16 parts, 19 parts, 22 parts, 25 parts, 28 parts, 31 parts, 34 parts or 37 parts, etc.), photoinitiator 3-8 parts (for example, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts or 7.5 parts, etc.) and coupling agent 0.5-3 parts (for example, 0.8 parts, 1.1 parts, 1.4 parts, 1.7 parts, 2.0 parts, 2.3 parts, 2.6 parts or 2.9 parts, etc.).

[0010] In the present invention, the acrylate oligomer and acrylate monomer in the low outgassing UV moisture dual-curing three-proof paint can react under the action of a photoinitiator to form a cross-linked network, wherein the addition of a thermoplastic acrylic resin for compounding can form a complementary system, accelerate the reaction speed, increase the molecular cross-linking density, improve the adhesion to the substrate, improve weather resistance and chemical resistance, and improve flexibility; in addition, the thermoplastic acrylic resin has low volatility and can reduce VOC emissions; adding a coupling agent for compounding can improve the wettability and adhesion to the substrate. The low outgassing UV moisture dual-curing three-proof paint prepared by compounding the acrylate oligomer, thermoplastic acrylic resin, acrylate monomer, photoinitiator and coupling agent does not contain solvent, has a low volatile content, fast curing speed, high adhesion, and good weather resistance and chemical resistance.

[0011] Preferably, the acrylate oligomer comprises urethane acrylate.

[0012] Preferably, the polyurethane acrylate includes any one of allnex EBECRYL 4150, allnex EBECRYL 4250 or Sartomer CN1073, or a combination of at least two thereof.

[0013] Preferably, the weight average molecular weight of the thermoplastic acrylic resin is 5000-50000, for example, 10000, 15000, 20000, 25000, 30000, 35000, 40000 or 45000.

[0014] In the present invention, the weight average molecular weight of the thermoplastic acrylic resin is preferably 5000 to 50000. If the weight average molecular weight of the thermoplastic acrylic resin is too low, the low outgassing performance of the prepared low outgassing UV moisture dual-cure conformal coating is reduced and the thermal weight loss rate is high; if the weight average molecular weight of the thermoplastic acrylic resin is too high, the compatibility of the thermoplastic acrylic resin with other components is poor.

[0015] Preferably, the acrylate monomers include monofunctional acrylate monomers and multifunctional acrylate monomers.

[0016] Preferably, the mass ratio of the monofunctional acrylate monomer to the multifunctional acrylate monomer is (1-3):1.

[0017] In the present invention, the mass ratio of the monofunctional acrylate monomer to the multifunctional acrylate monomer is preferably (1-3):1. If the mass percentage of the multifunctional acrylate monomer is too high, the paint film formed by the prepared low outgassing UV moisture dual-cure conformal coating is relatively hard and brittle, easy to crack, and the environmental test effect is reduced; if the mass percentage of the multifunctional acrylate monomer is too low, the paint film formed by the prepared low outgassing UV moisture dual-cure conformal coating has a low crosslinking density, a low double bond conversion rate of the system, a reduced low outgassing performance, and a high thermal weight loss rate.

[0018] Preferably, the monofunctional acrylate monomer includes a monofunctional acrylate monomer and / or a monofunctional methacrylate monomer.

[0019] Preferably, the monofunctional acrylate monomer includes any one or a combination of at least two of isobornyl acrylate, tetrahydrofuran acrylate, trimethylolpropane formal acrylate, lauryl acrylate, isobutyl acrylate or 3,3,5-trimethylcyclohexanol acrylate.

[0020] Preferably, the monofunctional methacrylate monomer includes any one of ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, isooctyl methacrylate or lauryl methacrylate, or a combination of at least two thereof.

[0021] Preferably, the multifunctional acrylate monomer includes any one of tricyclodecane dimethanol diacrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate or pentaerythritol triacrylate, or a combination of at least two thereof.

[0022] Preferably, the photoinitiator includes any one or a combination of at least two of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-(trimethylbenzoyl)diphenyl phosphine oxide, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, methyl benzoylformate, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-isopropylthioxanthone, benzoin dimethyl ether, dimethylbenzil ketal or benzophenone.

[0023] Preferably, the coupling agent comprises a silane coupling agent.

[0024] Preferably, the silane coupling agent includes vinyltrimethoxysilane and / or γ-methacryloxypropyltrimethoxysilane.

[0025] Preferably, the silane coupling agent includes Maitu A171 and / or Maitu A174.

[0026] Preferably, the raw materials for preparing the low outgassing UV moisture dual-cure conformal coating further include 0 to 1 part of an additive by weight, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part or 0.9 part, etc.

[0027] Preferably, the auxiliary agent includes a leveling agent.

[0028] Preferably, the leveling agent includes any one of leveling agent BYK333, leveling agent TEGO450 or leveling agent Levaslip8629, or a combination of at least two thereof.

[0029] In a second aspect, the present invention provides a method for preparing the low outgassing UV moisture dual-cure conformal coating as described in the first aspect, the preparation method comprising mixing an acrylate oligomer, a thermoplastic acrylic resin, an acrylate monomer, a photoinitiator and a coupling agent to obtain the low outgassing UV moisture dual-cure conformal coating.

[0030] Preferably, the mixing further comprises mixing with an auxiliary agent.

[0031] In a third aspect, the present invention provides a use of the low outgassing UV moisture dual-cure conformal coating as described in the first aspect in the protection of printed circuit boards.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The low-outgassing UV moisture dual-curing conformal paint prepared by compounding components such as acrylate oligomers, thermoplastic acrylic resins, acrylate monomers, photoinitiators and coupling agents has low volatile content, fast curing speed, high adhesion, good weather resistance and chemical resistance. The thermal weight loss rate of the paint film formed by the low-outgassing UV moisture dual-curing conformal paint is ≤1.7%, there is no cracking under hot and cold shocks, and the environmental test results can reach excellent or good. Preferably, the thermal weight loss rate of the paint film formed by the low-outgassing UV moisture dual-curing conformal paint is ≤0.7%. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0035] Example 1

[0036] The present embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof. The raw materials for preparing the low outgassing UV moisture dual-cure conformal coating include the following components in parts by weight: 45 parts of acrylate oligomer (Zhanxin EBECRYL4150), 15 parts of thermoplastic acrylic resin (brand Mitsubishi BR-113), 35 parts of acrylate monomer, 5 parts of photoinitiator, 2 parts of coupling agent (Maitu A171), and 0.5 parts of auxiliary agent (leveling agent BYK333).

[0037] The above-mentioned acrylate monomers are isobornyl acrylate and tricyclodecane dimethanol diacrylate in a mass ratio of 2.5:1;

[0038] The photoinitiator is 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide and methyl benzoylformate in a mass ratio of 1:4.

[0039] The preparation method comprises the following steps:

[0040] The acrylate oligomer, the thermoplastic acrylic resin, the acrylate monomer, the photoinitiator, the coupling agent and the auxiliary agent are mixed to obtain the low outgassing UV moisture dual-curing conformal paint.

[0041] Example 2

[0042] The present embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof. The raw materials for preparing the low outgassing UV moisture dual-cure conformal coating include the following components in parts by weight: 60 parts of acrylate oligomer (Allnex EBECRYL4250), 22 parts of thermoplastic acrylic resin (brand name Covestro B-302), 40 parts of acrylate monomer, 3 parts of photoinitiator, 3 parts of coupling agent (Maitu A171), and 1 part of auxiliary agent (leveling agent Levaslip 8629).

[0043] The above-mentioned acrylate monomer is 3,3,5-trimethylcyclohexyl acrylate and dipropylene glycol diacrylate in a mass ratio of 3:1;

[0044] The photoinitiator is 1-hydroxycyclohexyl phenyl ketone and 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide in a mass ratio of 2:1.

[0045] The preparation method comprises the following steps:

[0046] The acrylate oligomer, the thermoplastic acrylic resin, the acrylate monomer, the photoinitiator, the coupling agent and the auxiliary agent are mixed to obtain the low outgassing UV moisture dual-curing conformal paint.

[0047] Example 3

[0048] The present embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof. The raw materials for preparing the low outgassing UV moisture dual-cure conformal coating include the following components in parts by weight: 35 parts of acrylate oligomer (Zhanxin EBECRYL4250), 22 parts of thermoplastic acrylic resin (brand name Covestro B-805), 20 parts of acrylate monomer, 3 parts of photoinitiator, 1 part of coupling agent (Maitu A171), and 0.1 part of additive (leveling agent TEGO 450).

[0049] The acrylate monomers are tetrahydrofuran acrylate and trimethylolpropane formal acrylate in a mass ratio of 1:1;

[0050] The photoinitiator is 1-hydroxycyclohexyl phenyl ketone and 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide in a mass ratio of 2:1.

[0051] The preparation method comprises the following steps:

[0052] The acrylate oligomer, the thermoplastic acrylic resin, the acrylate monomer, the photoinitiator, the coupling agent and the auxiliary agent are mixed to obtain the low outgassing UV moisture dual-curing conformal paint.

[0053] Example 4

[0054] This embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof, which differs from Example 1 only in that the coupling agent (Maitu A171) is replaced with a coupling agent of the same quality (Maitu A174), and other conditions are the same as those in Example 1.

[0055] Example 5

[0056] This embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof. The only difference between this embodiment and Example 1 is that the weight fraction of the thermoplastic acrylic resin (brand name: Mitsubishi BR-113) is adjusted to 10 parts, and the other conditions are the same as those in Example 1.

[0057] Example 6

[0058] This embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof. The difference between this embodiment and Example 1 is that the weight fraction of the thermoplastic acrylic resin (brand name: Mitsubishi BR-113) is adjusted to 30 parts, and the other conditions are the same as those in Example 1.

[0059] Example 7

[0060] This embodiment provides a low outgassing UV moisture dual-cure conformal coating and a preparation method thereof, which is different from Example 1 only in that the acrylate monomer includes isobornyl acrylate and tricyclodecane dimethanol diacrylate in a mass ratio of 17.5:1, and other conditions are the same as those in Example 1.

[0061] Comparative Example 1

[0062] This comparative example provides a UV moisture dual-curing conformal coating and a preparation method thereof, which is different from Example 1 only in that the weight fraction of the thermoplastic acrylic resin (brand name Mitsubishi BR-113) is adjusted to 35 parts, and other conditions are the same as Example 1.

[0063] Comparative Example 2

[0064] This comparative example provides a UV moisture dual-curing conformal coating and a preparation method thereof, which is different from Example 1 only in that the weight portion of the thermoplastic acrylic resin (brand name Mitsubishi BR-113) is adjusted to 5 parts, and other conditions are the same as Example 1.

[0065] Comparative Example 3

[0066] This comparative example provides a UV moisture dual-curing conformal coating and a preparation method thereof, which is different from Example 1 only in that no thermoplastic acrylic resin (brand name: Mitsubishi BR-113) is added, and other conditions are the same as those in Example 1.

[0067] The low outgassing UV moisture dual-curing conformal coatings provided in Examples 1 to 7 and the UV moisture dual-curing conformal coatings provided in Comparative Examples 1 to 3 were tested as follows:

[0068] Preparation of paint film: The low outgassing UV moisture dual-curing conformal paint provided in Examples 1 to 7 and the UV moisture dual-curing conformal paint provided in Comparative Examples 1 to 3 were respectively subjected to UV curing and moisture curing in sequence, and the light intensity of UV curing was 300 mW / cm 2 , time is 30s; the humidity of moisture curing is 50%, and the time is 7 days to form a paint film.

[0069] (1) Adhesion: The adhesion of the paint film is tested by a 100-grid test in accordance with GB / T 9286-2021;

[0070] (2) Thermal shock: The test conditions are -40°C for 0.5 h and 85°C for 0.5 h. Repeat the test for 200 cycles to observe whether the paint film has cracks.

[0071] (3) Thermal weight loss rate (%): The weight loss rate of the paint film after being placed at 125°C for 24 hours is tested according to standard ASTM E595-15 (2021);

[0072] (4) Environmental test: The low outgassing UV moisture dual-curing conformal coatings provided in Examples 1 to 7 and the UV moisture dual-curing conformal coatings provided in Comparative Examples 1 to 3 were coated on the surface of the PCB circuit board for UV curing and moisture curing, respectively. The light intensity of UV curing was 300 mW / cm 2 , time is 30s; humidity of moisture curing is 50%, time is 7 days to form paint film, and environmental test is carried out after curing;

[0073] Environmental tests include high temperature and high humidity test and salt spray test, which are carried out in sequence. The test conditions of high temperature and high humidity test are: temperature 85℃, humidity 85%, time 500h; the test conditions of salt spray test are: NaCl solution with mass percentage concentration of 5%, room temperature 25℃, 7 days;

[0074] If there is no circuit corrosion on the PCB after the environmental test and the circuit is unobstructed, it is considered excellent. If there is slight corrosion on the PCB but the circuit is unobstructed, it is considered good. If the PCB is corroded and the circuit is not obstructed, it is considered poor.

[0075] The test results are shown in Table 1 below.

[0076] Table 1

[0077]

[0078]

[0079] In Table 1, “ / ” means that the test was not conducted.

[0080] It can be seen from the contents of Table 1 that the paint films formed by the low outgassing UV moisture dual-cure conformal coatings provided in Examples 1 to 7 have a thermal weight loss rate of ≤1.7%, have good low outgassing properties, have no cracking due to thermal shock, and have excellent or good environmental test results.

[0081] Compared with Example 1, if the weight fraction of the thermoplastic acrylic resin is too low (Example 5), the thermal weight loss rate of the prepared low outgassing UV moisture dual-curing conformal coating will become higher, but the adhesion and thermal shock performance will be less affected; if the weight fraction of the thermoplastic acrylic resin is too high (Example 6), the prepared low outgassing UV moisture dual-curing conformal coating film will be hard and brittle, and the thermal weight loss rate effect is very good, but the adhesion and environmental tests will be affected to a certain extent. It can be seen that the weight fraction of the thermoplastic acrylic resin is further preferably controlled to 15 to 22 parts, and the prepared low outgassing UV moisture dual-curing conformal coating has better performance.

[0082] Compared with Example 1, if the mass ratio of the monofunctional acrylate monomer to the multifunctional acrylate monomer is high (Example 7), the thermal weight loss rate of the prepared low outgassing UV moisture dual-cure conformal coating increases. It can be seen that when the mass ratio of the monofunctional acrylate monomer to the multifunctional acrylate monomer is controlled within a specific range, the prepared low outgassing UV moisture dual-cure conformal coating has better performance.

[0083] Compared with Example 1, if the weight fraction of the thermoplastic acrylic resin is too high (Comparative Example 1), the prepared low outgassing UV moisture dual-cure conformal coating will have compatibility problems, resulting in turbidity of the low outgassing UV moisture dual-cure conformal coating.

[0084] Compared with Example 1, if the weight fraction of the thermoplastic acrylic resin is too low (Comparative Example 2), the paint film formed by the prepared low outgassing UV moisture dual-curing conformal paint has a high thermal weight loss rate and cannot achieve the low outgassing effect.

[0085] Compared with Example 1, if the thermoplastic acrylic resin is not added (Comparative Example 3), the paint film formed by the prepared low outgassing UV moisture dual-curing conformal paint has a high thermal weight loss rate and cannot achieve the low outgassing effect.

[0086] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate a low outgassing UV moisture dual-curing conformal coating and its preparation method and application, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

Claims

1. A low outgassing UV moisture dual-cure conformal coating, characterized in that: The raw materials for preparing the low-outgassing UV moisture dual-curing conformal coating include the following components in parts by weight: 35-60 parts of acrylate oligomer, 10-30 parts of thermoplastic acrylic resin, 10-40 parts of acrylate monomer, 3-8 parts of photoinitiator and 0.5-3 parts of coupling agent.

2. The low outgassing UV moisture dual-cure conformal coating according to claim 1, characterized in that: The acrylate oligomer includes polyurethane acrylate; Preferably, the weight average molecular weight of the thermoplastic acrylic resin is 5,000 to 50,000.

3. The low outgassing UV moisture dual-cure conformal coating according to claim 1 or 2, characterized in that: The acrylate monomers include monofunctional acrylate monomers and multifunctional acrylate monomers; Preferably, the mass ratio of the monofunctional acrylate monomer to the multifunctional acrylate monomer is (1-3):

1.

4. The low outgassing UV moisture dual-cure conformal coating according to claim 3, characterized in that: The monofunctional acrylate monomer includes a monofunctional acrylate monomer and / or a monofunctional methacrylate monomer; Preferably, the monofunctional acrylate monomer includes any one or a combination of at least two of isobornyl acrylate, tetrahydrofuran acrylate, trimethylolpropane formal acrylate, lauryl acrylate, isobutyl acrylate or 3,3,5-trimethylcyclohexanol acrylate; Preferably, the monofunctional methacrylate monomer includes any one of ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, isooctyl methacrylate or lauryl methacrylate, or a combination of at least two thereof; Preferably, the multifunctional acrylate monomer includes any one of tricyclodecane dimethanol diacrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate or pentaerythritol triacrylate, or a combination of at least two thereof.

5. The low outgassing UV moisture dual-cure conformal coating according to any one of claims 1 to 4, characterized in that: The photoinitiator includes any one of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-(trimethylbenzoyl)diphenyl phosphine oxide, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, methyl benzoylformate, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-isopropylthioxanthone, benzoin dimethyl ether, dimethylbenzil ketal or benzophenone, or a combination of at least two thereof.

6. The low outgassing UV moisture dual-cure conformal coating according to any one of claims 1 to 5, characterized in that: The coupling agent includes a silane coupling agent; Preferably, the silane coupling agent includes vinyltrimethoxysilane and / or γ-methacryloxypropyltrimethoxysilane.

7. The low outgassing UV moisture dual-cure conformal coating according to any one of claims 1 to 6, characterized in that: The raw materials for preparing the low outgassing UV moisture dual-curing conformal coating further include 0 to 1 part of an auxiliary agent by weight; Preferably, the auxiliary agent includes a leveling agent.

8. A method for preparing a low outgassing UV moisture dual-curing conformal coating as claimed in any one of claims 1 to 7, characterized in that: The preparation method comprises mixing an acrylate oligomer, a thermoplastic acrylic resin, an acrylate monomer, a photoinitiator and a coupling agent to obtain the low-outgassing UV moisture dual-curing conformal paint.

9. The preparation method according to claim 8, characterized in that: The mixing also includes mixing with auxiliary agents.

10. Use of the low outgassing UV moisture dual-curing conformal coating according to any one of claims 1 to 7 in the protection of printed circuit boards.

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