WO2022257641A1

WO2022257641A1 - Waterproof insulating coating and application thereof

Info

Publication number: WO2022257641A1
Application number: PCT/CN2022/090016
Authority: WO
Inventors: 李鹏飞; 谭东升; 任林德
Original assignee: 荣耀终端有限公司
Priority date: 2021-06-09
Filing date: 2022-04-28
Publication date: 2022-12-15
Also published as: CN115449291A; CN115449291B

Abstract

A waterproof insulating coating and an application thereof; the waterproof insulating coating comprises at least one waterproof insulating film-forming component from among the following I to III: I: an organolinear siloxane compound represented by structural formula A shown below, R₁ to R₈ in structural formula A independently being any one among a hydrogen atom, a halogen atom, methoxy, ethoxy, C₁-C₃alkyl, C₃-C₁₀cycloalkyl, and C₆-C₁₅ aryl, and m being an integer between 10-100; II: n-alkane or isoalkane represented by structural formula B: C_nH_2n+n, n in structural formula B being an integer between 8-15; and III: a fluorine-containing aliphatic polymer represented by structural formula C: CxFyHzNjO_k, x in structural formula C being an integer between 8-20, y being an integer between 6-42, z being an integer between 0-9, j being 0 or 1, and k being 0 or 1.

Description

Waterproof and insulating coating and its application

This application claims the priority of the Chinese patent application with the application number 202110644523.X and the application name "Waterproof Insulation Coating and Its Application" submitted to the State Intellectual Property Office on June 9, 2021, the entire contents of which are incorporated herein by reference Applying.

technical field

The application belongs to the technical field of waterproof insulating materials and electronic consumables, and in particular relates to a waterproof insulating coating and its application.

Background technique

With the increasing integration and modularization of circuit boards, connectors are widely used in electronic products. As a bridge between components, connectors have the function of conducting signals and currents. The use of connectors greatly improves the flexibility and convenience of electronic product assembly, maintenance and upgrading. The connectors soldered on the printed circuit board (Printed Circuit Board, PCB) after the periphery of the electronic product enters the liquid are prone to short circuit and electrochemical corrosion, resulting in functional failure.

Taking the widely used board-to-board connector (Board to Board, BTB) connector as an example, one of the existing BTB connector protection technologies in the industry is shown in Figure 1. "The foam/rubber ring 2, the foam/rubber ring 2 is compressed between the BTB male reinforcing steel plate 3 and the PCB board 4 to achieve sealing. This technology mainly has the following problems: 1) Occupying the space of the board The cotton/rubber ring needs to have a certain width, and the components around the BTB need to avoid space; 2) The foam/rubber ring needs to have a certain amount of compression, which is higher than the height of the BTB female head and affects the buckle; 3) In order to achieve compression and top sealing, BTB The size of the male reinforcing steel plate needs to be increased; 4) The size of each BTB is different, and it needs to be customized according to the size of each BTB, and the manufacturing process is complicated; 5) The long-term compression of the foam reduces the resilience and the protective effect.

The second prior art is to carry out vacuum nano-coating on the circuit board, and form a hydrophobic or water-proof solid film layer on the surface of the connector by vapor deposition. The problem with this technology is that when the thickness of the coating film is low, it cannot effectively protect the irregular surface of the connector. , when the coating thickness is thick, it will affect the functions of some devices on the board, and at the same time affect the conduction of the connector. Even if the thickness accuracy of the film layer is improved, there is a problem that the solid film layer cannot be effectively pierced when the male and female heads of the connector are fastened, resulting in the failure of the male and female heads of the connector to conduct.

Existing technology three, there are also waterproof and/or insulating coatings, but after research, it is found that although the existing waterproof insulating coatings can achieve waterproof or insulating or both waterproof and insulating effects, but because the film layer is in the connector When the male and female heads are fastened together, they cannot be effectively punctured, resulting in the inability of the male and female heads of the connector to conduct, such as fluorinated liquid, conformal paint, etc., which cannot be used for waterproofing the connector scene.

Contents of the invention

The purpose of the embodiments of the present application is to provide a waterproof insulating coating, which aims to solve the problem that the existing vacuum nano-coating, waterproof and/or insulating coatings cannot effectively penetrate the connection in the waterproof application of electrical connectors, and the film layer is difficult to control, resulting in buckling. Unsatisfactory technical problems with unsatisfactory waterproof effects.

In order to achieve the purpose of the above application, an aspect of the embodiment of the present application provides a waterproof insulating coating. The waterproof and insulating coating of the embodiment of the present application includes at least one waterproof and insulating film-forming component in the following I to III:

Ⅰ: An organolinear siloxane compound represented by the following structural formula A:

Wherein, R ₁ to R ₈ in the structural formula A are independently hydrogen atom, halogen atom, methoxy group, ethoxy group, C ₁ -C ₃ alkyl group, C ₃ -C ₁₀ cycloalkyl group, C ₆ -C ₁₅ Any of the aryl groups, m is an integer of 10-100;

II: Normal alkanes or isoparaffins shown in the following structural formula B; wherein, n in the structural formula B is an integer of 8-15;

C _n H _2n+n B;

III: A fluorine-containing aliphatic polymer represented by the following structural formula C, wherein, in the structural formula C, x is an integer of 8-20, y is an integer of 6-42, z is an integer of 0-9, and j is 0 or 1, k is 0 or 1;

C _x F _y H _z N _j O _k C.

The waterproof insulating coating of the embodiment of the present application can effectively form a film such as a film on a connector, and the film layer has good insulation and waterproof properties, thereby giving a device containing the waterproof insulating coating film layer, such as a connector, a good waterproof effect. , At the same time, the insulation will not affect and cause the short circuit between the pins of the connector, which improves the stability and service life of the corresponding device performance. At the same time, the paste-like (or fat-like) film layer formed by the waterproof insulating coating has good puncture characteristics such as proper cone penetration, and it can be effectively punctured at a fixed point under the action of an external force such as realizing male and female connectors. The snap-fit conductive connection of the head. At the same time, the film layer formed by the waterproof insulating coating has good extrusion and calendering characteristics, which reduces the strict requirements on the coating thickness of the waterproof insulating coating, and can directly adjust the thickness of the film layer to achieve good waterproof and insulating effect.

Optionally, the waterproof insulating coating includes a mixture of two waterproof insulating film-forming components I and II, and the mass ratio of the two waterproof insulating film-forming components I and II is 3:(0.8-1.2).

Optionally, the waterproof insulating coating includes a mixture of two waterproof insulating film-forming components I and III, and the mass ratio of the two waterproof insulating film-forming components I and III is 3:(1.5-2.5).

Optionally, the waterproof insulating coating includes a mixture of two waterproof insulating film-forming components II and III, and the mass ratio of the two waterproof insulating film-forming components II and III is 1:(1.3-2.8).

Optionally, the waterproof insulating coating includes a mixture of three waterproof and insulating film-forming components of I, II and III, and the mass ratio of the three waterproof and insulating film-forming components of I, II and III is 3:(0.8 -1.2): (1.5-2.5).

Optionally, when the organolinear siloxane compound contains a halogen atom, the halogen atom is any of F, CL, Br, I; when the organolinear siloxane compound contains a C ₁ -C ₃ alkyl group, C ₁ -C ₃ alkyl includes any one of methyl, ethyl, propyl, and isopropyl; when the organolinear siloxane compound contains C ₃ -C ₁₀ cycloalkyl, C ₃ -C ₁₀ cycloalkane The group includes any of three-carbon cycloalkyl, four-carbon cycloalkyl, and five-carbon cycloalkyl; when the organolinear siloxane compound contains a C ₆ -C ₁₅ aryl group, the C ₆ -C ₁₅ aryl group includes Any of the aryl group containing one phenol group and the aryl group containing two phenol groups.

Specifically, organolinear siloxane compounds include polydiphenyldimethyllinear siloxane, polydimethoxylinear siloxane, polymethylethoxylinear siloxane, polymethyltrifluoropropyl At least one of linear siloxane and polymethylchlorophenyl linear siloxane, and normal alkanes include at least one of n-octane, n-decane, n-undecane, laurane, and n-tetradecane One, isoparaffins include at least one of iso-dodecane, iso-decane, and iso-tetradecane, and fluorine-containing aliphatic polymers include bis-heptafluoropropyl ketone, methyl nonafluorobutyl ether , at least one of pentafluoroethyl heptafluoropropyl ketone and heptafluorocyclopentane.

Through the control and optimization of the types of waterproof and insulating film-forming components, the waterproof effect of waterproof and insulating coatings can be effectively improved on the basis of imparting insulation effects to waterproof and insulating coatings, and the characteristics of piercing at fixed points can be improved, and its applicability can be improved. The applicability in the field of connectors can also improve the extrusion and calendering properties of the waterproof insulating coating film.

Optionally, the waterproof insulating coating further includes at least one of a viscosity modifier and a volatile solvent. By adding a viscosity modifier and a volatile solvent to the waterproof insulating coating, the uniformity of dispersion of the components contained in the waterproof insulating coating is improved, the film-forming quality of the waterproof insulating coating is improved and the diversity of film-forming methods is increased.

Further, the viscosity modifier includes at least one of titanium dioxide, silicon dioxide, talcum powder, and calcium carbonate;

Further, the volatile solvent includes at least one of perfluorinated solvents, ester solvents, and ether solvents.

Specifically, the perfluorinated solvent includes at least one of methyl perfluorobutyl ether, methyl perfluoroisobutyl ether, ethyl perfluorobutyl ether, and ethyl perfluoroisobutyl ether; the ester solvent includes ethyl acetate, At least one of methyl acetate; ether solvents include at least one of diethyl ether and petroleum ether.

Through the selection of the viscosity modifier and the volatile solvent type, the above-mentioned functions of the viscosity modifier and the volatile solvent can be improved in the waterproof insulating coating, and the solute of the waterproof insulating coating, such as the solubility of the waterproof insulating film-forming component, can be improved. The viscosity of the waterproof insulating coating is used to improve the dispersion stability of the components of the waterproof insulating coating, thereby improving the film-forming quality of the waterproof insulating coating. Waterproof and insulating properties.

Further, the waterproof insulating coating comprises a mixture of the waterproof insulating film-forming component and the viscosity-adjusting agent, and the mass ratio of the waterproof insulating film-forming component to the viscosity-adjusting agent is 1:(1-2) .

Or further, the waterproof insulating coating includes a mixture of the waterproof insulating film-forming component and the volatile solvent, and the mass ratio of the waterproof insulating film-forming component to the volatile solvent is 1:(5-20 ).

Or further, the waterproof insulating coating includes a mixture of the waterproof insulating film-forming component, the volatile solvent and the viscosity-adjusting agent, and the waterproof insulating film-forming component, the volatile solvent and the viscosity-adjusting agent The mass ratio is 1:(5-20):(1-2).

By controlling and adjusting the content ratio of each component of the waterproof insulating coating, the stability of the waterproof insulating coating is improved, the film-forming quality is improved, and the fixed-point puncture, film layer extrusion and calendering characteristics and waterproof insulation performance of the waterproof insulating coating are further improved.

Optionally, the penetration of the film layer formed by the waterproof insulating paint is 200-350 (0.1mm); and/or

Optionally, the resistance of the film layer formed by the waterproof insulating coating is >10 ⁸ Ω; and/or

Optionally, the surface water contact angle of the film layer formed by the waterproof insulating coating is >100°; and/or

Optionally, the leakage current of the film layer formed by the waterproof insulating coating is <0.01mA.

Based on the above-mentioned components and types of components contained in the waterproof insulating coating, the waterproof insulating coating is endowed with good puncture characteristics, high insulation and water resistance.

Another aspect of the embodiment of the present application provides an application method of the waterproof insulating coating according to the embodiment of the present application, and its application in circuit board connectors, electronic products, home appliances, and automobiles. Since the waterproof insulating coating of the embodiment of the present application has good stability and film-forming properties as described above, its film layer has excellent waterproofness, insulation performance, cone penetration, and extrusion and calendering characteristics of the film layer, which effectively expands the embodiment of the present application. The application field of the waterproof insulating coating, and the application effect in the corresponding field and device are enhanced, and the quality of the corresponding device is improved.

In yet another aspect of the embodiments of the present application, a circuit board connector is provided. The circuit board connector of the embodiment of the present application includes a circuit board connector body, at least a waterproof insulating film layer is formed on the conductor joint area of the circuit board connector body, and the waterproof insulating film layer is formed by the waterproof insulating coating of the embodiment of the present application form. In this way, at least the conductor joint area of the circuit board connector is covered and protected by the waterproof insulating film layer. When the male and female heads of the circuit board connector are fastened, the film layer covering the pins will be pierced and squeezed to realize the contact conduction of the male and female heads of the circuit board connector, and the film layer at the non-pins will still be squeezed. Attached around the pins to achieve wrapping and protection, so as to achieve good waterproof and insulation protection for the circuit board connector, improve the stable connection of the circuit board connector, and prolong the service life. In addition, because the film layer formed by the waterproof insulating coating in the embodiment of the present application has good film extrusion and calendering characteristics, the thickness control requirements of the waterproof insulating film layer can be significantly reduced, and both male and female connectors of circuit board connectors can be realized. Stable fastening, and can significantly reduce the production process conditions and control of the waterproof insulating film layer, improve the production efficiency of the circuit board connector and reduce the cost.

Optionally, the thickness of the waterproof insulating film layer included in the circuit board connector is not less than 10 μm. Since the waterproof insulating film layer has good film extrusion and calendering characteristics, it is only necessary to control the minimum thickness requirement of the waterproof insulating film layer, which can significantly reduce the thickness accuracy requirement of the waterproof insulating film layer.

Still another aspect of the embodiments of the present application provides a circuit board. The circuit board in the embodiment of the present application includes a circuit board connector, and the circuit board connector is the circuit board connector in the embodiment of the present application. In this way, the male and female connectors contained in the circuit board of the embodiment of the application have stable buckling and conduction, and have a good waterproof effect, which can effectively improve the life of the circuit board connector, thereby giving the circuit of the embodiment of the application Board stable performance, and long life.

Still another aspect of the embodiments of the present application provides an electronic product. The electronic product in the embodiment of the present application includes a circuit board, and the circuit board is the circuit board in the embodiment of the present application.

Further, electronic products include mobile phones, tablets, PCs, watches, bracelets, and earphones.

Still another aspect of the embodiments of the present application provides a household electrical appliance. The home appliance product in the embodiment of the present application includes a circuit board, and the circuit board is the circuit board in the embodiment of the present application.

Still another aspect of the embodiments of the present application provides a car. The car in the embodiment of the present application includes a circuit board, and the circuit board is the circuit board in the embodiment of the present application.

The electronic products, home appliances and automobiles of the embodiments of the present application all contain the circuit boards of the embodiments of the present application. Therefore, the electrical modules contained in the electronic products, home appliances and automobiles in the embodiments of the present application have stable working performance and long service life.

Description of drawings

Figure 1 is a picture of the "frame-shaped" foam/rubber ring pasted around the female head of the existing BTB connector and a schematic diagram of the structure after the male head and the female head of the BTB connector are buckled;

Fig. 2 is a structural diagram of one embodiment of the circuit board connector body contained in the circuit board connector of the embodiment of the present application and a structural schematic diagram of the fastening of the female head and the male head after the film formation of the circuit board connector body of this embodiment; Figure a in Figure 2 is a structural diagram of one embodiment of the female head of the circuit board connector body; Figure b in Figure 2 shows the female head of the circuit board connector with the main body of the circuit board connector shown in Figure a in Figure 2 Schematic diagram of the structure of the male buckle;

3 is a schematic diagram of the formation process of the waterproof insulating film layer contained in the circuit board connector of the embodiment of the present application and the buckling principle of the male and female heads of the circuit board connector;

Fig. 4 is a schematic flow diagram of forming a waterproof insulating film layer on the circuit board connector body by a paste waterproof insulating coating according to an embodiment of the present application;

FIG. 5 is a schematic flow diagram of forming a waterproof insulating film layer on a circuit board connector body by a liquid waterproof insulating paint according to an embodiment of the present application.

The reference signs in the accompanying drawings of the embodiments of the present application are as follows:

1-circuit board connector body, 11-female head of circuit board connector body, 12-male head;

2-foam/rubber ring; 3-(BTB male) reinforced steel plate; 4-PCB board; 5-waterproof insulating film.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved in the present application clearer, the present application will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

In the description of this application, it should be understood that the term "and/or" describes the association relationship of associated objects, indicating that there may be three kinds of relationships, for example, A and/or B, which may mean: A exists alone, and A exists at the same time A and B, the case where B exists alone. Among them, A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship.

In this application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one item (unit) of a, b, or c", or "at least one item (unit) of a, b, and c" can mean: a, b, c, a-b( That is, a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

Terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

In this embodiment of the application, the term "and/or" describes the relationship between related objects, indicating that there may be three relationships, for example, A and/or B, which may mean: A exists alone, A and B exist simultaneously, and A and B exist independently. There is a case of B. Among them, A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship.

It should be understood that in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and some or all steps may be executed in parallel or sequentially, and the execution order of each process shall be based on its functions and The internal logic is determined and should not constitute any limitation to the implementation process of the embodiment of the present application.

The weight of the relevant components mentioned in the description of the embodiments of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the various components. The scaling up or down of the content of the fraction is within the scope disclosed in the description of the embodiments of the present application. Specifically, the mass described in the description of the embodiments of the present application may be μg, mg, g, kg and other well-known mass units in the chemical industry.

The terms "first" and "second" are only used for descriptive purposes to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX can also be called the second XX, and similarly, the second XX can also be called the first XX. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features.

Explanation of relevant names below:

PCB: English is Printed Circuit Board, Chinese is printed circuit board.

BTB: Board to Board in English, board to board in Chinese, refers to a type of connector in the embodiment of this application, specifically refers to a board to board connector.

BTB connector: A type of connector, specifically a board-to-board connector, which is also a BTB (Board to Board) connector.

SIR: Surface Insulation Resistance in English and Insulation Resistance in Chinese.

On the one hand, the embodiment of the present application provides a waterproof insulating coating. The waterproof and insulating coating of the embodiment of the present application includes at least one waterproof and insulating film-forming component in the following I to III:

Wherein, R ₁ to R ₈ in the structural formula A are independently hydrogen atom, halogen atom, methoxy group, ethoxy group, C ₁ -C ₃ alkyl group, C ₃ -C ₁₀ cycloalkyl group, C ₆ -C ₁₅ Any of the aryl groups, m is an integer of 10-100; in an embodiment, the halogen atom can be any of F, CL, Br, and I, and the C ₁ -C ₃ alkyl group includes methyl, ethyl Any of , propyl, isopropyl, etc., C ₃ -C ₁₀ cycloalkyl can be, but not limited to, any of three-carbon cycloalkyl, four-carbon cycloalkyl, five-carbon cycloalkyl, etc. , The C ₆ -C ₁₅ aryl group may be any one including an aryl group containing one phenol group, an aryl group containing two phenol groups, and the like. In a specific embodiment, the organic linear siloxane compound can specifically be polydiphenyldimethyl linear siloxane, polydimethoxy linear siloxane, polymethylethoxy linear siloxane, polymethoxy At least one of trifluoropropyl linear siloxane and polymethylchlorophenyl linear siloxane.

II: Normal alkanes or isoparaffins shown in the following structural formula B;

C _n H _2n+n B.

Wherein, n in the structural formula B is an integer of 8-15; in an embodiment, the n-alkane can specifically be n-octane (C8), n-decane (C10), n-undecane (C11), laurane (C12 ), normal tetradecane (C14); the isoparaffin may specifically be at least one of iso-dodecane, iso-decane, and iso-tetradecane.

Ⅲ: Fluorine-containing aliphatic polymer with the following structural formula C:

C _x F _y H _z N _j O _k C.

Wherein, x in the structural formula C is an integer of 8-20, y is an integer of 6-42, z is an integer of 0-9, j is 0 or 1, and k is 0 or 1; in the embodiment, the fluorine-containing aliphatic Specifically, the polymer may be at least one of bis-heptafluoropropyl ketone, methyl nonafluorobutyl ether, pentafluoroethyl heptafluoropropyl ketone, and heptafluorocyclopentane.

At least one waterproof insulating film-forming component in the above-mentioned I to III has good hydrophobicity, insulation, cone penetration and calendering deformation, and also has good film-forming properties. Therefore, the waterproof insulating coating of the embodiment of the present application can effectively form a film such as a film on a connector, and give the film layer good insulation and waterproof performance, thereby giving a device containing the waterproof insulating coating film layer such as a good connector. Waterproof effect, and the insulation of the waterproof insulating coating of the embodiment of the present application will not affect or cause short circuit between pins of the connector, which improves the stability and service life of the corresponding device performance. At the same time, the waterproof insulating coating is endowed with a paste-like or fat-like film layer, and the film layer is endowed with good puncture properties such as proper cone penetration characteristics, which can be effectively punctured at a fixed point under the action of external forces. Snap-fit conductive connection of male and female connectors. In addition, it also endows the film layer formed by the waterproof insulating coating with good extrusion calendering and deformation characteristics, which reduces the strict requirements on the coating thickness of the waterproof insulating coating, and can directly adjust the thickness of the film layer to achieve Good waterproof and insulating effect.

Based on at least any one of the waterproof and insulating film-forming components of I to III contained in the above-mentioned waterproof and insulating paint. Therefore, above-mentioned waterproof insulating paint comprises following embodiment at least:

In the first embodiment, the waterproof insulating coating includes a mixture of two waterproof insulating film-forming components I and II, and the mass ratio of the two waterproof insulating film-forming components I and II is 3:(0.8-1.2) .

In the second embodiment, the waterproof insulating coating includes a mixture of two waterproof insulating film-forming components I and III, and the mass ratio of the two waterproof insulating film-forming components I and III is 3:(1.5- 2.5).

In the third embodiment, the waterproof insulating coating includes a mixture of two waterproof insulating film-forming components II and III, and the mass ratio of the two waterproof insulating film-forming components II and III is 1:(1.3-2.8) .

In the fourth embodiment, the waterproof insulating coating includes a mixture of three waterproof and insulating film-forming components of I, II and III, and the mass ratio of the three waterproof and insulating film-forming components of I, II and III is 3:( 0.8-1.2): (1.5-2.5).

Of course, the waterproof and insulating paint also includes the embodiment that only contains any one of the waterproof and insulating film-forming components from I to III.

Through the control and adjustment of the types of waterproof and insulating film-forming components, the waterproof effect of the waterproof and insulating coating can be effectively improved on the basis of endowing the waterproof and insulating coating with insulation properties, and the fixed-point puncture can be improved, such as improving the cone penetration characteristics, film-forming properties and deformation. Features, improve its applicability, such as applicability in the field of connectors.

On the basis of the above embodiments, in the embodiments, the above waterproof insulating coating further includes at least one of a viscosity modifier and a volatile solvent. By adding a viscosity modifier and a volatile solvent to the waterproof insulating coating, the uniformity of dispersion of the components contained in the waterproof insulating coating is improved, the film-forming quality of the waterproof insulating coating is improved and the diversity of film-forming methods is increased.

In an embodiment, the viscosity modifier includes at least one of titanium dioxide, silicon dioxide, talc, and calcium carbonate. These viscosity modifiers can effectively adjust the viscosity of the waterproof insulating coating, improve the dispersion uniformity of each component of the waterproof insulating coating before and during use, thereby improving the film-forming quality of the waterproof insulating coating. At the same time, these viscosity-adjusting agents will also play a synergistic effect on insulation and other properties with the above-mentioned waterproof and insulating film-forming components, and improve the insulating effect of the above-mentioned waterproof and insulating film-forming components, and will not affect the penetration of the waterproof and insulating coating. and extrusion properties.

In other embodiments, the volatile solvent includes at least one of perfluorinated solvents, ester solvents, and ether solvents. Specifically, the perfluorinated solvent includes at least one of methyl perfluorobutyl ether, methyl perfluoroisobutyl ether, ethyl perfluorobutyl ether, and ethyl perfluoroisobutyl ether; the ester solvent includes ethyl acetate, At least one of methyl acetate; ether solvents include at least one of diethyl ether and petroleum ether. These solvents have good volatility, so that after the waterproof insulating coating is formed into a film, it can volatilize naturally, thereby increasing the rate of fixing the film. At the same time, it has good solubility in dissolving the above waterproof and insulating film-forming components. The existence of its volatile solvent can act as a solvent carrier, so that the above waterproof and insulating film-forming components can form a uniform dispersion solution, thereby further improving the film layer. uniformity and quality. Moreover, it gives the selectivity of various modes of film formation for waterproof insulating coatings.

In addition, through the selection of the type of viscosity modifier and volatile solvent, the above-mentioned functions of the viscosity modifier and volatile solvent in the waterproof insulating coating can be improved, and the solute of the waterproof insulating coating, such as the solubility of the waterproof insulating film-forming component, can be improved. 1. Increase the viscosity of the waterproof insulating coating to improve the dispersion stability of the components of the waterproof insulating coating, thereby improving the film-forming quality of the waterproof insulating coating. properties and waterproof insulation properties.

On the basis that the above-mentioned waterproof insulating coating contains at least one of a viscosity-adjusting agent and a volatile solvent, the above-mentioned waterproof insulating coating includes at least the following embodiments:

In the fifth embodiment, the waterproof insulating coating includes a mixture of the waterproof insulating film-forming component and the viscosity-adjusting agent, and the mass ratio of the waterproof insulating film-forming component to the viscosity-adjusting agent is 1:( 1-2).

In the sixth embodiment, the waterproof insulating coating includes a mixture of the waterproof insulating film-forming component and the volatile solvent, and the mass ratio of the waterproof insulating film-forming component to the volatile solvent is 1:( 5-20).

In the seventh embodiment, the waterproof insulating coating includes a mixture of the waterproof insulating film-forming component, the volatile solvent and the viscosity modifier, and the waterproof insulating film-forming component, the volatile solvent and the The mass ratio of the viscosity adjusting agent is 1:(5-20):(1-2).

Based on the components contained in the waterproof insulating coatings of the above embodiments and further adjusting the content of each component, the waterproof insulating coatings are given excellent waterproof effect, fixed-point puncture characteristics and film-forming properties. and deformation properties. If it is tested, the penetration of the film layer formed by the waterproof insulating paint is 200-350, the resistance of the film layer formed by the waterproof insulating paint is >10 ⁸ Ω, and the surface water contact angle of the film layer formed by the waterproof insulating paint is >100° , The leakage current of the film layer formed by the waterproof insulating coating is <0.01mA.

In addition, the preparation methods of the above-mentioned waterproof and insulating coatings in each embodiment can be formulated according to the components and contents contained therein, and all the components can be mixed evenly.

On the other hand, based on the above-mentioned application examples of waterproof insulating coatings and their good stability and film-forming properties as described above, the film layer has excellent waterproofness, insulation performance, cone penetration, and film layer extrusion and calendering characteristics. Therefore, the embodiment of the present application also provides the application method of the above waterproof and insulating coating, and the application of the waterproof and insulating coating in circuit board connectors, electronic products, home appliances, and automobiles. This application effectively expands the application field of the waterproof insulating coating of the embodiment of the present application, and enhances the application effect in corresponding fields and devices.

In another aspect, the embodiment of the present application provides a circuit board connector. The circuit board connector of the embodiment of the present application includes a circuit board connector body, and a waterproof insulating film layer is formed at least on the conductor joint area of the circuit board connector body, and the waterproof insulating film layer is formed by the waterproof insulating coating of the embodiment of the present application. In the embodiment, the structure of the circuit board connector in the embodiment of the present application is shown in Figure 2, Figure 4 and Figure 5, which includes the circuit board connector body 1, at least in the conductor joint area of the circuit board connector body 1, that is, A waterproof and insulating film layer 5 is formed on the female connector 11, and the waterproof and insulating film layer 5 is formed by forming a film of the waterproof and insulating paint in the above application embodiment. Wherein, the female head 11 of the circuit board connector body 1 can be as shown in figure a in FIG. 2 , FIG. 4 and FIG. 5 , and of course the circuit board connector body 1 can also have other structures. In this way, when the female head 11 and the male head 12 of the circuit board connector body 1 are buckled by the reinforcing steel plate 3, the waterproof insulating film layer 5 covering the pins will be pierced and squeezed to realize the female connector of the circuit board connector. The pins of the header 11 and the male header 12 are in contact with each other, and the waterproof insulating film layer 5 at the non-pin is squeezed and still attached to the pins to achieve wrapping and protection, as shown in Figure 2 b, so as to realize the The good waterproof and insulation protection of the circuit board connector improves the stable connection of the circuit board connector and prolongs the service life. In addition, because the waterproof insulating film layer 5 formed by the waterproof insulating coating in the embodiment of the present application has good film extrusion and rolling characteristics, the thickness control requirements of the waterproof insulating film layer 5 can be significantly reduced, and the circuit board connector can be realized. The stable buckling of the female connector 11 and the male connector 12 of the body 1 can significantly reduce the production process conditions and control of the waterproof insulating film layer 5, improve the production efficiency of the circuit board connector, and reduce the cost. Certainly, the circuit board connector in the embodiment of the present application is generally installed on the PCB board, as shown in FIG. 2 , FIG. 4 and FIG. 5 , it is installed on the PCB board 4 .

Since the waterproof insulating film 5 has good film extrusion and calendering properties, it is only necessary to control the minimum thickness requirement of the waterproof insulating film layer 5 , which can significantly reduce the thickness accuracy requirement of the waterproof insulating film layer 5 . In an embodiment, the thickness of the waterproof insulating film layer 5 included in the circuit board connector is not less than 10 μm. Since the waterproof insulating film layer 5 has good calenderability of the film layer, it only needs to control its minimum guaranteed insulation and waterproof thickness, and any thickness greater than this thickness meets the requirements of the film layer.

In addition, the formation process of the waterproof insulating film layer 5 contained in the circuit board connector of the embodiment of the present application and the buckling principle of the female connector 11 and the male connector 12 of the circuit board connector body 1 are shown in FIG. 3 . After the female head 11 and the male head 12 are buckled together, the connector pins of the circuit board connector body 11 squeeze and pierce the waterproof insulating film layer 5 at the pins to achieve conductive connection, and the waterproof insulation in other areas of the pins The film layer 5 will surround the pins for waterproof and insulation, so as to protect the circuit board connector from waterproof and insulation, so as to significantly improve the working stability and service life of the circuit board connector.

Based on the above-mentioned waterproof insulating coating, the waterproof insulating film layer 5 contained in the circuit board connector of the embodiment of the present application can be formed according to the method of coating formation. As shown in Figure 4, the paste-like waterproof insulating coating can be directly formed into a film on the circuit board connector body 1, such as by scraping, spraying, rolling, etc. to form a film, that is, to form a waterproof The insulating film layer 5 forms a circuit board connector. When the female connector 11 and the male connector 12 of the circuit board connector body 1 are buckled together, a conductive connection is realized and a waterproof effect is realized.

When the above-mentioned waterproof insulating coating is liquid, if it contains a volatile solvent, the liquid waterproof insulating coating can be directly formed into a film on the circuit board connector body 1. In a specific embodiment, as shown in Figure 5, the liquid waterproof insulating coating is dripped Apply on the surface of the circuit board connector body 11 to form droplets 6, the droplets 6 will diffuse to form a film, forming a waterproof insulating film layer 5, and the volatile solvent will be volatilized during the process of the droplets 6 spreading to form a film The circuit board connector is formed after the solvent evaporates. When the female connector 11 and the male connector 12 of the circuit board connector body 1 are buckled together, a conductive connection is realized and a waterproof effect is realized. Of course, the waterproof insulating film layer 5 may also be formed by spraying or the like.

Of course, it is also possible to liquefy the above-mentioned paste-like waterproof insulating coating to form a liquid state, and then form a film of the liquid waterproof insulating coating on the circuit board connector body 1, and apply it on the circuit board connector body 1 after the paste is liquefied by heat. Afterwards, the surface diffuses and condenses to form a film at room temperature, that is, the waterproof insulating film layer 5 is formed.

It is also possible to vaporize the above-mentioned paste-like waterproof insulating coating to form a gaseous state, and then form a film on the circuit board connector body 1 with the gaseous waterproof insulating coating, such as using vapor deposition to form a film on the circuit board connector body 1 .

In yet another aspect, based on the above-mentioned circuit board connector, an embodiment of the present application further provides a circuit board. The circuit board in the embodiment of the present application includes a circuit board connector, which is the circuit board connector in the embodiment of the above application. In this way, the male and female connectors contained in the circuit board of the embodiment of the application have stable buckling and conduction, and have a good waterproof effect, which can effectively improve the life of the circuit board connector, thereby giving the circuit of the embodiment of the application Board stable performance, and long life. Wherein, the circuit board may be a single board or a multi-layer board.

In another aspect, based on the above-mentioned circuit board, the embodiment of the present application further provides any device or product including a circuit board, such as an electronic product, a home appliance product, an automobile, or the like. The circuit board contained in any device or product such as electronic products, home appliances, automobiles, etc. is the circuit board of the embodiment of the present application.

In an embodiment, electronic products include mobile phones, tablets, PCs, watches, bracelets, and earphones. Of course, it can also be other electronic products containing the above-mentioned circuit board of the embodiment of the present application.

In the embodiment, the home appliance products include large household appliances, consumer electronics products, kitchen and bathroom and small home appliances, environment and health home appliances, smart home appliances and other products.

In the embodiment, the vehicle includes traditional energy vehicles, trams, new energy vehicles and the like.

Since the above-mentioned electronic products, household electrical appliances and automobiles all contain the circuit boards of the embodiments of the present application, the electrical modules contained in the electronic products, household electrical appliances and automobiles of the embodiments of the present application have stable working performance and long service life.

The above-mentioned waterproof insulating coating and its application will be described in detail below in conjunction with specific examples.

1. Examples of waterproof and insulating coatings

Example A1

This embodiment provides a waterproof insulating coating. The waterproof insulating paint contains an organolinear siloxane compound of polydiphenyldimethyllinear siloxane.

Example A2

This embodiment provides a waterproof insulating coating. The waterproof insulating paint contains alkane of laurane (C12).

Example A3

This embodiment provides a waterproof insulating coating. The waterproof insulating paint contains fluorine-containing aliphatic polymer of methyl nonafluorobutyl ether.

Example A4

This embodiment provides a waterproof insulating coating. The waterproof insulating coating contains a mixture of organolinear siloxane compound of polydiphenyldimethyl linear siloxane and alkane of laurane (C12), and the mass ratio of organolinear siloxane compound to alkane is 3:1 .

Example A5

This embodiment provides a waterproof insulating coating. The waterproof insulating coating contains a mixture of an organolinear siloxane compound of polydiphenyldimethyl linear siloxane and a fluorine-containing aliphatic polymer of methyl nonafluorobutyl ether, and the organolinear siloxane compound contains The mass ratio of fluoroaliphatic polymer is 3:2.

Example A6

This embodiment provides a waterproof insulating coating. The mixture of alkane of laurane (C12) and fluorine-containing aliphatic polymer of methyl nonafluorobutyl ether, and the mass ratio of alkane to fluorine-containing aliphatic polymer is 1:2.

Example A7

This embodiment provides a waterproof insulating coating. The organolinear siloxane compound of polydiphenyldimethyl linear siloxane, the mixture of alkane of laurane (C12) and fluorinated aliphatic polymer of methyl nonafluorobutyl ether, and organolinear siloxane The mass ratio of alkanes, alkanes and fluorine-containing aliphatic polymers is 3:1:2.

Example A8

This embodiment provides a waterproof insulating coating. The mixture of organolinear siloxane compound of polydiphenyldimethyl linear siloxane, alkane of laurane (C12) and fluorine-containing aliphatic polymer of methyl nonafluorobutyl ether and petroleum ether volatile solvent , and the mass ratio of organolinear siloxane compound, alkane, fluorine-containing aliphatic polymer and volatile solvent is 3:1:2:60.

Example A9

This embodiment provides a waterproof insulating coating. The organic linear siloxane compound of polydiphenyldimethyl linear siloxane, the alkane of laurane (C12) and the fluorine-containing aliphatic polymer of methyl nonafluorobutyl ether and ethyl acetate volatile solvent and A mixture of talcum powder, and the mass ratio of organolinear silicone compound, alkane, fluorine-containing aliphatic polymer, volatile solvent and talc powder is 3:1:2:60:9.

Example A10

This embodiment provides a waterproof insulating coating. The mixture of organolinear siloxane compound of polydimethoxy linear siloxane, alkane of n-decane and fluorine-containing aliphatic polymer of bis-heptafluoropropyl ketone and ethyl acetate volatile solvent and talcum powder, And the mass ratio of organolinear siloxane compound, alkane, fluorine-containing aliphatic polymer, volatile solvent and talcum powder is 3:1.2:1.5:60:9.

Example A11

This embodiment provides a waterproof insulating coating. The mixture of organolinear siloxane compound of polymethylchlorophenyl linear siloxane, alkane of isodecane and fluorine-containing aliphatic polymer of heptafluorocyclopentane, ethyl acetate volatile solvent and talcum powder , and the mass ratio of organolinear siloxane compound, alkane, fluorine-containing aliphatic polymer, volatile solvent and talcum powder is 3:0.8:2.5:60:9.

2. Embodiment of circuit board and circuit board connector

Example B1 to Example B11

The waterproof and insulating coatings provided in the above-mentioned embodiments A1 to A11 are respectively applied to the connectors contained in the circuit board to form a film, and a waterproof and insulating film layer is formed on the connectors to obtain the circuit board connector and the circuit board respectively.

Comparative example 21

A circuit board connector is provided. Compared with the embodiment B1, the circuit board connector does not contain a waterproof insulating film layer.

3. Related performance tests of circuit board connectors and waterproof coatings

After buckling the male and female heads of the circuit board connectors in Example B1 to Example B11 and the circuit board connector in Comparative Example 21, respectively, test the penetration, insulation characteristics and continuity of the circuit board connectors and other performance.

3.1 Penetration test:

After fastening the circuit board connectors in Comparative Example 21 and Example B1 to Example B11 respectively, test the resistance of each circuit board connector. After testing, it is known that the circuit board connectors of each embodiment contain a waterproof insulating film layer and then contact There is no significant difference in resistance compared to Comparative Example 21 that does not contain a waterproof insulating film layer, indicating that the waterproof insulating film layer has good puncture performance and does not affect the fastening and conduction of the circuit board connector after coating.

3.2 Insulation test:

The waterproof insulating paint of embodiment A1 to embodiment A11 is coated on the insulation resistance (Surface Insulation Resistance, SIR) test board to form waterproof insulating film layer, then apply 50V bias voltage, be placed in double 85 environment (temperature 85 ℃, humidity 85% RH), under the test voltage of 100V, test the resistance every 0.5h for 1 week (168h). During the whole process, the resistance of each waterproof insulating film layer is greater than 10 ⁸ Ω. The resistances are also greater than 10 ⁸ Ω, and the connector body in each embodiment has no corrosion, indicating that the waterproof insulating film layer in each embodiment has good and stable insulation properties, and coating on the connector will not cause Connector contact pins are shorted or corroded.

3.3 Hydrophobicity and water barrier test:

After the waterproof insulating film layer of each circuit board connector in embodiment B1 to embodiment B11 is formed, the water contact angle on the surface of each waterproof insulating film layer is tested with a water drop angle tester and is greater than 100°, indicating that each waterproof insulating film layer has a good Hydrophobic effect;

The waterproof insulating paint of embodiment A1 to embodiment A11 is coated on the insulation resistance (SIR) test plate to form waterproof insulating film layer, then drip 10uL tap water on the surface of each waterproof insulating film layer, apply the voltage of 5V to test, 24h There is no corrosion on the body of each connector and the current reading is 0 (replenish in time after the dripped tap water volatilizes during the test), and the blank insulation resistance (SIR) without waterproof coating is corroded within 5 minutes of dripping water, and 2.76 mA current, until the dripped tap water reacts completely on the insulation resistance (SIR) test board, the resulting leakage current is >5mA. It shows that each waterproof insulating film layer has a good water-proof effect, and water will not penetrate each waterproof insulating film layer to cause short circuit and corrosion. After coating on the surface of the connector, water will not penetrate the material and cause short circuit of the connector when the connector is powered on.

The above-mentioned Example A9, Example B9 and Comparative Example 21 were selected as samples. The relevant performance data obtained by testing the circuit board connector according to the above-mentioned 3.1 to 3.3 test methods are shown in Table 1 below, wherein the uncoated in Table 1 is a comparative example 21 test data:

Table 1

Select the above-mentioned embodiment A10, embodiment B10 and comparative example 21 as samples and test the relevant performance data obtained by testing the circuit board connector according to the above-mentioned 3.1 to 3.3 test methods as shown in the following table 2, wherein the non-coating in table 2 is a comparative example 21 test data:

Table 2

The above-mentioned Example A11, Example B11 and Comparative Example 21 were selected as samples, and the relevant performance data obtained by testing the circuit board connector according to the above-mentioned 3.1 to 3.3 test methods are shown in Table 3 below, wherein the uncoated in Table 3 is a comparative example 21 test data:

table 3

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection of the application. within range.

Claims

A waterproof and insulating coating, including at least one waterproof and insulating film-forming component in the following I to III:

Ⅰ: An organolinear siloxane compound represented by the following structural formula A:

Wherein, R 1 to R 8 in the structural formula A are independently hydrogen atom, halogen atom, methoxy group, ethoxy group, C 1 -C 3 alkyl group, C 3 -C 10 cycloalkyl group, C 6 -C 15 Any of the aryl groups, m is an integer of 10-100;

II: Normal alkanes or isoparaffins shown in the following structural formula B; wherein, n in the structural formula B is an integer of 8-15;

C n H 2n+n B;

III: A fluorine-containing aliphatic polymer represented by the following structural formula C, wherein, in the structural formula C, x is an integer of 8-20, y is an integer of 6-42, z is an integer of 0-9, and j is 0 or 1, k is 0 or 1;

C x F y H z N j O k C.
The waterproof insulating coating according to claim 1, characterized in that: the waterproof insulating coating comprises a mixture of two waterproof insulating film-forming components I and II, and the two waterproof insulating film-forming components I and II The mass ratio is 3:(0.8-1.2); or

The waterproof insulating coating includes a mixture of two waterproof insulating film-forming components I and III, and the mass ratio of the two waterproof insulating film-forming components I and III is 3:(1.5-2.5); or

The waterproof insulating coating includes a mixture of two waterproof insulating film-forming components II and III, and the mass ratio of the two waterproof insulating film-forming components II and III is 1:(1.3-2.8); or

The waterproof insulating coating includes a mixture of three waterproof and insulating film-forming components of I, II and III, and the mass ratio of the three waterproof and insulating film-forming components of I, II and III is 3:(0.8-1.2): (1.5-2.5).
The waterproof insulating paint as claimed in claim 1 or 2, characterized in that: the halogen atom is any one of F, CL, Br, I;

The C 1 -C 3 alkyl group includes any one of methyl, ethyl, propyl, and isopropyl;

The C 3 -C 10 cycloalkyl group includes any one of a three-carbon cycloalkyl group, a four-carbon cycloalkyl group, and a five-carbon cycloalkyl group;

The C 6 -C 15 aryl group includes any one of an aryl group containing one phenol group and an aryl group containing two phenol groups.
The waterproof insulating coating according to claim 1 or 2, characterized in that: the organolinear siloxane compound comprises polydiphenyldimethylsiloxane, polydimethoxyl linear siloxane, polymethoxysiloxane At least one of ethoxyl linear siloxane, polymethyltrifluoropropyl linear siloxane, polymethylchlorophenyl linear siloxane;

The normal alkanes include at least one of n-octane, n-decane, normal undecane, laurane, and normal tetradecane;

The isoparaffins include at least one of iso-dodecane, iso-decane, and iso-tetradecane;

The fluorine-containing aliphatic polymer includes at least one of bis-heptafluoropropyl ketone, methyl nonafluorobutyl ether, pentafluoroethyl heptafluoropropyl ketone, and heptafluorocyclopentane.
The waterproof insulating paint as claimed in claim 1 or 2, is characterized in that: also comprise at least one in viscosity adjusting agent, volatile solvent.
The waterproof insulating coating according to claim 5, characterized in that: the viscosity-adjusting agent comprises at least one of titanium dioxide, silicon dioxide, talcum powder, and calcium carbonate;

The volatile solvent includes at least one of perfluorinated solvents, ester solvents, and ether solvents.
The waterproof insulating coating according to claim 6, wherein the perfluorinated solvent comprises methyl perfluorobutyl ether, methyl perfluoroisobutyl ether, ethyl perfluorobutyl ether, ethyl perfluoroisobutyl ether at least one of;

The ester solvent includes at least one of ethyl acetate and methyl acetate;

The ether solvent includes at least one of diethyl ether and petroleum ether.
The waterproof insulating coating according to claim 5, characterized in that: the waterproof insulating coating comprises a mixture of the waterproof insulating film-forming component and the viscosity-adjusting agent, and the waterproof insulating film-forming component and the The mass ratio of the viscosity modifier is 1:(1-2); or

The waterproof insulating coating includes a mixture of the waterproof insulating film-forming component and the volatile solvent, and the mass ratio of the waterproof insulating film-forming component to the volatile solvent is 1:(5-20);

or

The waterproof and insulating coating includes a mixture of the waterproof and insulating film-forming component, the volatile solvent and the viscosity-adjusting agent, and the mass of the waterproof and insulating film-forming component, the volatile solvent and the viscosity-adjusting agent The ratio is 1:(5-20):(1-2).
The waterproof insulating coating according to any one of claims 1, 2, 6-9, characterized in that: the penetration of the film layer formed by the waterproof insulating coating is 200-350; and/or

The surface resistance of the film layer formed by the waterproof insulating coating is >10 8 Ω; and/or

The surface water contact angle of the film layer formed by the waterproof insulating coating is >100°; and/or

The leakage current of the film layer formed by the waterproof insulating paint is less than 0.01mA.
The application of the waterproof insulating coating described in any one of claims 1-9 in circuit board connectors, electronic products, home appliances, and automobiles.
A circuit board connector, characterized in that it includes a circuit board connector body, at least a waterproof insulating film layer is formed on the conductor joint area of the circuit board connector body, and the waterproof insulating film layer is defined by claim 1- 9. The waterproof insulating coating described in any one of the above is formed into a film.
The circuit board connector according to claim 11, wherein the thickness of the waterproof insulating film layer is not less than 10 μm.
A circuit board, characterized by comprising a circuit board connector, the circuit board connector being the circuit board connector according to any one of claims 11-12.
An electronic product, comprising a circuit board, characterized in that: the circuit board is the circuit board of claim 13.
The electronic product according to claim 14, wherein the electronic product includes a mobile phone, a tablet, a PC, a watch, a bracelet, and an earphone.
A household electrical appliance, comprising a circuit board, characterized in that the circuit board is the circuit board of claim 13.
An automobile comprising a circuit board, characterized in that the circuit board is the circuit board of claim 13.