High-performance three-proofing coating

Abstract

The invention belongs to the technical field of circuit board protection, and particularly relates to a high-performance three-proofing coating which comprises the following components: 35-70% of an ionic polyurethane mixture; 5 to 20 percent of 2-methyl-2, 4-pentanediol; 1-2% of polyisobutene; 10-45% of absolute ethyl alcohol; 0.01 to 2 percent of phosphate ester; 0.01-1% of organic anti-counterfeiting fluorescent powder; 2 to 4% of hexamethylene diisocyanate based polyisocyanate; 0.01 to 1 percent of 1, 2, 3-benzotriazole; 0.01 to 1% of octadecanamide modified hydrogenated castor oil; and 0.01-1% of a castor oil derivative thixotropic agent. According to the invention, an ingenious and reasonable formula is adopted, so that the solid content is more than 35%, the adhesive can be cured after being baked for 2-4 minutes at the temperature of 80-100 DEG C, and the adhesive can pass ROHS2.0, HF halogen and REACH-SVHC detection. Compared with the prior art, the high-performance three-proofing coating at least has the following advantages: firstly, the high-performance three-proofing coating has excellent resistance and toluene resistance; secondly, the bending analysis resistance is good; thirdly, the formed film is uniform and high in transparency; fourthly, the adhesive force is strong, and fifthly, the paint is environment-friendly and has no influence on the environment.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit board protection, and in particular relates to a high-performance three-proof coating. Background Art

[0002] The three-proof coating is applied to the surface of the circuit board to form a three-proof protective film, which can effectively isolate the circuit board and protect the circuit from erosion and damage in the harsh environment, thereby improving the reliability of the circuit board, increasing its safety factor, and ensuring its service life.

[0003] The main function of the three-proof coating is to extend the life of components or circuits. The use is to apply the three-proof coating on the surface of components or circuits to form a thin layer through dipping, spraying, brushing and other processes to protect them from harsh environments and mechanical damage.

[0004] In the real world, moisture is the most common and destructive factor to circuit boards. Excessive moisture can significantly reduce the insulation resistance between conductors, accelerate high-speed decomposition, and corrode conductors. We often see patina on the metal parts of circuit boards because the lack of conformal coatings causes a chemical reaction between the metal copper and water vapor and oxygen.

[0005] Hundreds of contaminants have been found on scrapped printed circuit boards, and they are extremely destructive. They can cause the same results as moisture corrosion - electronic decay, corrosion of conductors and even irreparable short circuits. The most common contaminants found in electrical systems may be caused by chemicals left over from the manufacturing process. Examples of these contaminants are flux, solvent release agents, metal particles and marking inks. There are also major contaminant groups caused by carelessness during human handling, such as body oils, fingerprints, cosmetics and food residues. There are also many contaminants in the operating environment, such as salt spray, sand, fuel, acid, and other corrosive vapors and mold.

[0006] The three-conformal coating is applied to printed circuit boards and components to reduce or eliminate the degradation of electronic operating performance when they may be affected by adverse factors in the operating environment. If this coating can maintain its effect for a satisfactory period of time, such as longer than the product's service life, it can be considered to have achieved its coating purpose. In addition, the current requirements for the three-conformal coating layer are: even if the coating layer is very thin, it can still withstand mechanical vibration and swing, thermal shock, and operation at high temperatures to a certain extent.

[0007] Existing conformal coatings may have problems such as uneven coating, bubbles, poor adhesion, incomplete curing, white mist, cracks, delamination, contamination and pinholes during the coating process. In addition, they produce a strong pungent odor during the equipment coating process and cannot pass third-party environmental protection testing.

[0008] In order to overcome the shortcomings of the existing three-proof coating, the present invention aims to provide a high-performance three-proof coating with uniform film formation, high transparency, good bending resistance, low odor and environmental protection. Summary of the invention

[0009] The purpose of the present invention is to provide a high-performance three-proof coating with uniform film formation, high transparency, good bending resistance, low odor and environmental protection in view of the shortcomings of the prior art.

[0010] In order to achieve the above object, the present invention adopts the following technical solution:

[0011] A high-performance conformal coating, comprising the following components by weight percentage:

[0012] Ionic polyurethane mixture 35-70%;

[0013] 2-Methyl-2,4-pentanediol 5-20%;

[0014] Polyisobutylene 1-2%;

[0015] Anhydrous ethanol 10-45%;

[0016] Phosphate 0.01-2%;

[0017] Organic anti-counterfeiting fluorescent powder 0.01-1%;

[0018] Hexamethylene diisocyanate based polyisocyanate 2-4%;

[0019] 1,2,3-Benzotriazole 0.01-1%;

[0020] Octadecanamide modified hydrogenated castor oil 0.01-1%;

[0021] Castor oil derivative thixotropic agent 0.01-1%.

[0022] Among them, the ionic polyurethane mixture forms a film after heating, which plays a protective role. 2-methyl-2,4-pentanediol can increase the overall boiling point of the coating, and the coating will not change in quality during long-term storage. Polyisobutylene can adjust the viscosity of the coating. Anhydrous ethanol can dilute the ionic polyurethane mixture. Phosphate ester can expand the leveling coating. Organic anti-counterfeiting fluorescent powder can be used to check whether the coating is under-coated or missed under a UV lamp. Hexamethylene diisocyanate-based polyisocyanate reacts chemically in an environment of 80-100°C to make the coating cure quickly. 1,2,3-Benzotriazole can remove oxides and prevent oxidation. Octadecanamide-modified hydrogenated castor oil is used together with a castor oil derivative thixotropic agent to give the coating a rheological effect, making it convenient to adjust the coating thickness.

[0023] As an improvement of the high-performance three-proof coating of the present invention, the following components are included in weight percentage:

[0024] Ionic polyurethane mixture 40-65%;

[0025] 2-Methyl-2,4-pentanediol 7-15%;

[0026] Polyisobutylene 1.2-1.7%;

[0027] Anhydrous ethanol 15-40%;

[0028] Phosphate 0.1-1.5%;

[0029] Organic anti-counterfeiting fluorescent powder 0.1-0.8%;

[0030] Hexamethylene diisocyanate based polyisocyanate 2.5-3.5%;

[0031] 1,2,3-Benzotriazole 0.1-0.7%;

[0032] Octadecanamide modified hydrogenated castor oil 0.1-0.7%;

[0033] Castor oil derivative thixotropic agent 0.1-0.7%.

[0034] As an improvement of the high-performance three-proof coating of the present invention, the following components are included in weight percentage:

[0035] Ionic polyurethane mixture 50%;

[0036] 2-Methyl-2,4-pentanediol 12.2%;

[0037] Polyisobutylene 1.5%;

[0038] Anhydrous ethanol 30%;

[0039] Phosphate 1.3%;

[0040] Organic anti-counterfeiting fluorescent powder 0.5%;

[0041] Hexamethylene diisocyanate based polyisocyanate 3%;

[0042] 1,2,3-Benzotriazole 0.5%;

[0043] Octadecanamide modified hydrogenated castor oil 0.5%;

[0044] Castor oil derivative thixotropic agent 0.5%.

[0045] As an improvement of the high-performance three-proof coating of the present invention, the ionic polyurethane mixture is a mixture of an alcohol-soluble acrylic resin and a water-soluble acrylic resin, and the mass ratio of the two is (0.1-10):1.

[0046] As an improvement of the high-performance three-proof coating of the present invention, the castor oil derivative thixotropic agent is methylene bisstearamide.

[0047] As an improvement of the high-performance three-proof coating of the present invention, the organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

[0048] As an improvement of the high-performance three-proof coating of the present invention, when used, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 80-100°C, and attached to the surface of the circuit board. This film is uniformly formed, highly transparent, and has good bending resistance. The circuit board achieves three-proof under the protection of the film layer.

[0049] The present invention also provides a method for preparing a high-performance three-proof coating, which is characterized by comprising the following steps:

[0050] The first step is to add the ionic polyurethane mixture into the first container, and then place it on a dispersion table with a rotation speed of 200-800 rpm, add hexamethylene diisocyanate polyisocyanate, and disperse for 1-10 minutes to obtain a mixture 1;

[0051] In the second step, 2-methyl-2,4-pentanediol is added into the second container, a heater is placed, the temperature is set to 60-100°C, and then polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent are added in sequence with rapid stirring to obtain mixture 2, and the mixture is cooled to room temperature; these three materials need to be dissolved at high temperature.

[0052] Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three;

[0053] Step 4: While maintaining the rotation speed, first add mixture 3 into mixture 1, disperse for 1-10 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 1-10 minutes.

[0054] The invention adopts an ingenious and reasonable formula to ensure that the solid content is above 35%, and can be cured by baking at 80-100° C. for 2-4 minutes, and can pass ROHS2.0, HF halogen, and REACH-SVHC tests.

[0055] Compared with the prior art, the high-performance three-proof coating of the present invention has at least the following advantages:

[0056] First, excellent resistance, toluene resistance; second, good flexural resistance; third, uniform film formation, high transparency; fourth, strong adhesion; fifth, environmental protection, no impact on the environment. DETAILED DESCRIPTION

[0057] Figure 1 This is a photo of a circuit board after the anti-corrosion coating of Example 1 is applied on the circuit board and before a neutral salt spray test is performed.

[0058] Figure 2 A photograph of a circuit board after the conformal coating of Example 1 is applied to the circuit board and subjected to a neutral salt spray test.

[0059] Figure 3 This is a photo of a circuit board after the conformal coating of Example 1 is applied to the circuit board and before the temperature / humidity cycle test is performed.

[0060] Figure 4 Photo of the circuit board after the temperature / humidity cycle test was carried out after the conformal coating of Example 1 was applied on the circuit board.

[0061] Figure 5 A photograph of a thin film formed after the conformal coating of Example 1 is applied on a circuit board.

[0062] Figure 6 A photograph of a thin film formed after the three-proof coating of Example 1 is applied on a circuit board under a UV light. DETAILED DESCRIPTION

[0064] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0065] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0066] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0067] Example 1

[0068] This embodiment provides a high-performance conformal coating, which includes the following components by weight percentage:

[0069] Ionic polyurethane mixture 50%;

[0070] 2-Methyl-2,4-pentanediol 12.2%;

[0071] Polyisobutylene 1.5%;

[0072] Anhydrous ethanol 30%;

[0073] Phosphate 1.3%;

[0074] Organic anti-counterfeiting fluorescent powder 0.5%;

[0075] Hexamethylene diisocyanate based polyisocyanate 3%;

[0076] 1,2,3-Benzotriazole 0.5%;

[0077] Octadecanamide modified hydrogenated castor oil 0.5%;

[0078] Castor oil derivative thixotropic agent 0.5%.

[0079] The ionic polyurethane mixture is a mixture of alcohol-soluble acrylic resin and water-soluble acrylic resin, and the mass ratio of the two is 1:1.

[0080] The castor oil derivative thixotropic agent is methylene bisstearamide.

[0081] The organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

[0082] When in use, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 90° C., and adhered to the surface of the circuit board.

[0083] The preparation method comprises the following steps:

[0084] The first step is to add the ionic polyurethane mixture into the first container, and then place it on a dispersion table with a rotation speed of 600 rpm, add hexamethylene diisocyanate polyisocyanate, and disperse for 2 minutes to obtain a mixture 1;

[0085] The second step is to add 2-methyl-2,4-pentanediol into a second container, put a heater into the container, set the temperature to 90° C., then add polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent in sequence with rapid stirring to obtain a second mixture, and cool the mixture to room temperature;

[0086] Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three;

[0087] Step 4: While maintaining the rotation speed, add mixture 3 to mixture 1, disperse for 3 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 3 minutes.

[0088] Example 2

[0089] This embodiment provides a high-performance conformal coating, which includes the following components by weight percentage:

[0090] Ionic polyurethane mixture 45%;

[0091] 2-Methyl-2,4-pentanediol 15%;

[0092] Polyisobutylene 1.2%;

[0093] Anhydrous ethanol 33.6%;

[0094] Phosphate 0.5%;

[0095] Organic anti-counterfeiting fluorescent powder 0.5%;

[0096] Hexamethylene diisocyanate based polyisocyanate 2.5%;

[0097] 1,2,3-Benzotriazole 0.4%;

[0098] Octadecanamide modified hydrogenated castor oil 0.6%;

[0099] Castor oil derivative thixotropic agent 0.7%.

[0100] The ionic polyurethane mixture is a mixture of alcohol-soluble acrylic resin and water-soluble acrylic resin, and the mass ratio of the two is 2:1.

[0101] The castor oil derivative thixotropic agent is methylene bisstearamide.

[0102] The organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

[0103] When in use, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 95° C., and adhered to the surface of the circuit board.

[0104] The preparation method comprises the following steps:

[0105] The first step is to add the ionic polyurethane mixture into the first container, and then place it on a dispersion table with a rotation speed of 650 rpm, add hexamethylene diisocyanate polyisocyanate, and disperse for 5 minutes to obtain a mixture 1;

[0106] The second step is to add 2-methyl-2,4-pentanediol into a second container, put a heater into the container, set the temperature to 95° C., then add polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent in sequence with rapid stirring to obtain a second mixture, and cool to room temperature;

[0107] Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three;

[0108] Step 4: While maintaining the rotation speed, add mixture 3 into mixture 1, disperse for 5 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 4 minutes.

[0109] Example 3

[0110] This embodiment provides a high-performance conformal coating, which includes the following components by weight percentage:

[0111] Ionic polyurethane mixture 55%;

[0112] 2-Methyl-2,4-pentanediol 13%;

[0113] Polyisobutylene 1.3%;

[0114] Anhydrous ethanol 25%;

[0115] Phosphate 1.2%;

[0116] Organic anti-counterfeiting fluorescent powder 0.3%;

[0117] Hexamethylene diisocyanate based polyisocyanate 3.1%;

[0118] 1,2,3-Benzotriazole 0.6%;

[0119] Octadecanamide modified hydrogenated castor oil 0.3%;

[0120] Castor oil derivative thixotropic agent 0.2%.

[0121] The ionic polyurethane mixture is a mixture of alcohol-soluble acrylic resin and water-soluble acrylic resin, and the mass ratio of the two is 1:4.

[0122] The castor oil derivative thixotropic agent is methylene bisstearamide.

[0123] The organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

[0124] When in use, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 85° C., and adhered to the surface of the circuit board.

[0125] The preparation method comprises the following steps:

[0126] The first step is to add the ionic polyurethane mixture into the first container, and then place it on a dispersion table with a rotation speed of 700 rpm, add hexamethylene diisocyanate polyisocyanate, and disperse for 2 minutes to obtain a mixture 1;

[0127] The second step is to add 2-methyl-2,4-pentanediol into a second container, put a heater into the container, set the temperature to 85° C., then add polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent in sequence with rapid stirring to obtain a second mixture, and cool the mixture to room temperature;

[0128] Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three;

[0129] Step 4: While maintaining the rotation speed, add mixture 3 into mixture 1, disperse for 6 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 3 minutes.

[0130] Example 4

[0131] This embodiment provides a high-performance conformal coating, which includes the following components by weight percentage:

[0132] Ionic polyurethane mixture 60%;

[0133] 2-Methyl-2,4-pentanediol 8%;

[0134] Polyisobutylene 1.4%;

[0135] Anhydrous ethanol 26%;

[0136] Phosphate 1.1%;

[0137] Organic anti-counterfeiting fluorescent powder 0.2%;

[0138] Hexamethylene diisocyanate based polyisocyanate 2.4%;

[0139] 1,2,3-Benzotriazole 0.3%;

[0140] Octadecanamide modified hydrogenated castor oil 0.4%;

[0141] Castor oil derivative thixotropic agent 0.2%.

[0142] The ionic polyurethane mixture is a mixture of alcohol-soluble acrylic resin and water-soluble acrylic resin, and the mass ratio of the two is 1:2.

[0143] The castor oil derivative thixotropic agent is methylene bisstearamide.

[0144] The organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

[0145] When in use, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 88° C., and attached to the surface of the circuit board.

[0146] The preparation method comprises the following steps:

[0147] The first step is to add the ionic polyurethane mixture into the first container, and then place it on a dispersion table with a rotation speed of 480 rpm, add hexamethylene diisocyanate polyisocyanate, and disperse for 6 minutes to obtain a mixture 1;

[0148] The second step is to add 2-methyl-2,4-pentanediol into a second container, put a heater into the container, set the temperature to 96° C., then add polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent in sequence with rapid stirring to obtain a second mixture, and cool the mixture to room temperature;

[0149] Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three;

[0150] Step 4: While maintaining the rotation speed, add mixture 3 into mixture 1, disperse for 7 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 5 minutes.

[0151] Example 5

[0152] This embodiment provides a high-performance conformal coating, which includes the following components by weight percentage:

[0153] Ionic polyurethane mixture 65%;

[0154] 2-Methyl-2,4-pentanediol 9.25%;

[0155] Polyisobutylene 1.8%;

[0156] Anhydrous ethanol 18%;

[0157] Phosphate 1.6%;

[0158] Organic anti-counterfeiting fluorescent powder 0.55%;

[0159] Hexamethylene diisocyanate based polyisocyanate 2.35%;

[0160] 1,2,3-Benzotriazole 0.65%;

[0161] Octadecanamide modified hydrogenated castor oil 0.45%;

[0162] Castor oil derivative thixotropic agent 0.35%.

[0163] The ionic polyurethane mixture is a mixture of alcohol-soluble acrylic resin and water-soluble acrylic resin, and the mass ratio of the two is 5:1.

[0164] The castor oil derivative thixotropic agent is methylene bisstearamide.

[0165] The organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

[0166] When in use, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 92° C., and adhered to the surface of the circuit board.

[0167] The preparation method comprises the following steps:

[0168] In the first step, the ionic polyurethane mixture is added into the first container, and then placed on a dispersion table with a rotation speed of 550 rpm, and hexamethylene diisocyanate-based polyisocyanate is added and dispersed for 8 minutes to obtain a mixture 1;

[0169] The second step is to add 2-methyl-2,4-pentanediol into a second container, put a heater into the container, set the temperature to 96° C., then add polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent in sequence with rapid stirring to obtain a second mixture, and cool the mixture to room temperature;

[0170] Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three;

[0171] Step 4: While maintaining the rotation speed, add mixture 3 into mixture 1, disperse for 8 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 6 minutes.

[0172] The circuit board coated with the high-performance three-proof coating of Example 1 was subjected to a neutral smoke test. The equipment used was a JX1402 salt spray test chamber. The environmental conditions were: temperature of 23.2°C, humidity of 65% RH; the test conditions were: chamber temperature of 35°C, saturator temperature of 47°C, solution concentration of 5% NaCl (mass ratio), solution pH of 6.5-7.2 (25°C), salt spray deposition of 1-2 ml / h×80 cm 2 The test time is 48 hours. The circuit board before the test is as follows Figure 1 As shown, the circuit board after testing is Figure 2 As shown, the test results show that: the appearance of the sample has no obvious change. It can be seen that the coating formed by the three-proof coating of the present invention has good salt spray resistance.

[0173] The circuit board coated with the high-performance three-proof coating of Example 1 was subjected to a temperature / humidity cycle test. The equipment used was an EL-02KA high and low temperature alternating humidity test chamber. The environmental conditions were: temperature of 24.2°C and humidity of 59% RH. The test conditions were: low temperature of -20°C, low temperature holding time of 24h, high temperature of 60°C, humidity of 90% RH, high temperature holding time of 24h, and temperature change rate of less than or equal to 1°C / minute. The circuit board before the test was as follows: Figure 3 As shown, the circuit board after testing is Figure 4 As shown, the test results show that: the appearance of the sample has no obvious change. It can be seen that the coating formed by the three-proof coating of the present invention has good high and low temperature performance.

[0174] The film formed in Example 1 is as follows Figure 5 As shown, the film is uniform and has high transparency. The photo of the film layer under ultraviolet light is as follows Figure 6 As shown, it can be seen that it has a fluorescent effect. In addition, the film layer has the characteristics of high adhesion and good bending resistance.

[0175] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A high-performance three-proof coating, characterized in that: In terms of weight percentage, it includes the following components: Ionic polyurethane mixture 35-70%; 2-Methyl-2,4-pentanediol 5-20%; Polyisobutylene 1-2%; Anhydrous ethanol 10-45%; Phosphate 0.01-2%; Organic anti-counterfeiting fluorescent powder 0.01-1%; Hexamethylene diisocyanate based polyisocyanate 2-4%; 1,2,3-Benzotriazole 0.01-1%; Octadecanamide modified hydrogenated castor oil 0.01-1%; Castor oil derivative thixotropic agent 0.01-1%.

2. The high performance conformal coating according to claim 1, characterized in that: In terms of weight percentage, it includes the following components: Ionic polyurethane mixture 40-65%; 2-Methyl-2,4-pentanediol 7-15%; Polyisobutylene 1.2-1.7%; Anhydrous ethanol 15-40%; Phosphate 0.1-1.5%; Organic anti-counterfeiting fluorescent powder 0.1-0.8%; Hexamethylene diisocyanate based polyisocyanate 2.5-3.5%; 1,2,3-Benzotriazole 0.1-0.7%; Octadecanamide modified hydrogenated castor oil 0.1-0.7%; Castor oil derivative thixotropic agent 0.1-0.7%.

3. The high performance conformal coating according to claim 2, characterized in that: In terms of weight percentage, it includes the following components: Ionic polyurethane mixture 50%; 2-Methyl-2,4-pentanediol 12.2%; Polyisobutylene 1.5%; Anhydrous ethanol 30%; Phosphate 1.3%; Organic anti-counterfeiting fluorescent powder 0.5%; Hexamethylene diisocyanate based polyisocyanate 3%; 1,2,3-Benzotriazole 0.5%; Octadecanamide modified hydrogenated castor oil 0.5%; Castor oil derivative thixotropic agent 0.5%.

4. The high performance conformal coating according to any one of claims 1 to 3, characterized in that: The ionic polyurethane mixture is a mixture of alcohol-soluble acrylic resin and water-soluble acrylic resin, and the mass ratio of the two is (0.1-10):

1.

5. The high performance conformal coating according to any one of claims 1 to 3, characterized in that: The castor oil derivative thixotropic agent is methylene bis stearamide.

6. The high performance conformal coating according to any one of claims 1 to 3, characterized in that: The organic anti-counterfeiting fluorescent powder is 3-methyl-4-[(4-methylphenyl)amino]-3H-naphtho.

7. The high performance conformal coating according to any one of claims 1 to 3, characterized in that: When in use, the three-proof coating is applied to the surface of the circuit board by immersion or equipment spraying, and then cured to form a thin film under baking at 80-100° C., and adhered to the surface of the circuit board.

8. A method for preparing a high-performance three-proof coating, characterized in that: The following steps are involved: The first step is to add the ionic polyurethane mixture into the first container, and then place it on a dispersion table with a rotation speed of 200-800 rpm, add hexamethylene diisocyanate polyisocyanate, and disperse for 1-10 minutes to obtain a mixture 1; The second step is to add 2-methyl-2,4-pentanediol into a second container, put a heater into the container, set the temperature to 60-100° C., then add polyisobutylene, octadecylamide-modified hydrogenated castor oil and castor oil derivative thixotropic agent in sequence with rapid stirring to obtain a second mixture, and cool the mixture to room temperature; Step three, adding anhydrous ethanol into a third container, and sequentially adding phosphate, 1,2,3-benzotriazole and organic anti-counterfeiting fluorescent powder with stirring to obtain a mixture three; Step 4: While maintaining the rotation speed, first add mixture 3 into mixture 1, disperse for 1-10 minutes, then add mixture 2 cooled to room temperature, and continue to disperse for 1-10 minutes.

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