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A kind of preparation method of circuit board nano waterproof film

A circuit board, waterproof membrane technology, applied in metal material coating process, vacuum evaporation plating, coating and other directions, can solve the problems of high heat dissipation performance requirements, large heat generation of circuit boards, toxicity of fluorine elements, etc. Good air tightness, high utilization rate of raw materials, easy popularization and application

Inactive Publication Date: 2019-05-17
GUANGDONG YINENG NANO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the air permeability of the plastic sealing ring is not good, the circuit board generates a lot of heat when it works, and the heat dissipation performance is high, so the application of the plastic sealing ring is seriously hindered.
[0007] The third is a waterproof and breathable membrane. Its main raw material is expanded polytetrafluoroethylene EPTFE, a hydrophobic material. It is a high-performance waterproof material with pressure bearing, breathability and non-destructive sound transmission. However, the EPTFE material is expensive, and fluorine is toxic. , causing the market to fail to promote

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of circuit board nano waterproof film, comprising the following steps:

[0044] 1) Soak the circuit board to be coated in a circuit board cleaning agent for ultrasonic cleaning, and then dry it. The circuit board cleaning solution is composed of fatty alcohol polyoxyethylene ether, amino acid, 5-methylbenzotriazole and alcohol Solvent composition, wherein the mass percentage of fatty alcohol polyoxyethylene ether is 0.1%, the mass percentage of the amino acid is 0.1%, the mass percentage of the 5-methylbenzotriazole is 0.5%, and the balance It is an alcoholic organic solvent; the drying temperature is 25°C, and the drying time is 20 minutes.

[0045] 2) Put the circuit board to be coated into the vacuum coating chamber, heat and evacuate; when the temperature of the evaporation chamber reaches 130°C, turn on the cold pump.

[0046] 3) Put the coating raw material into the evaporation chamber, and the temperature of the cooling pump before putting t...

Embodiment 2

[0051] A preparation method of circuit board nano waterproof film, comprising the following steps:

[0052] 1) Soak the circuit board to be coated in a circuit board cleaning agent and ultrasonically clean it, and then dry it. The circuit board cleaning solution consists of 2% fatty alcohol polyoxyethylene ether and 100% amino acid The content is 1%, the mass percentage content of the 5-methylbenzotriazole is 1%, and the balance is alcohol organic solvent.

[0053] The drying temperature is 30°C, and the drying time is 25 minutes.

[0054] 2) Put the circuit board to be coated into the vacuum coating chamber, heat and evacuate; when the temperature of the evaporation chamber reaches 130°C, turn on the cold pump.

[0055] 3) Put the coating raw material into the evaporation chamber, and the temperature of the cooling pump before putting the coating raw material is below -30°C. Continue vacuuming, and the coating raw material is heated and sublimated; the coating raw material ...

Embodiment 3

[0060] A preparation method of circuit board nano waterproof film, comprising the following steps:

[0061] 1) Soak the circuit board to be coated in a circuit board cleaning agent for ultrasonic cleaning, and then dry it. The circuit board cleaning solution is composed of fatty alcohol polyoxyethylene ether, amino acid, 5-methylbenzotriazole and alcohol Solvent composition, wherein the mass percentage of fatty alcohol polyoxyethylene ether is 2%, the mass percentage of the amino acid is 1%, the mass percentage of the 5-methylbenzotriazole is 0.8%, and the balance It is an alcoholic organic solvent; the drying temperature is 27°C, and the drying time is 22 minutes.

[0062] 2) Put the circuit board to be coated into the vacuum coating chamber, heat and evacuate; when the temperature of the evaporation chamber reaches 130°C, turn on the cold pump.

[0063] 3) Put the coating raw material into the evaporation chamber, and the temperature of the cooling pump before putting the c...

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Abstract

The invention relates to the technical field of circuit board waterproof film coating, in particular to a preparation method for a circuit board nanometer waterproof film. The method includes the following steps that (1) a circuit board to be coated with a film is soaked in a circuit board cleaning agent to be subjected to ultrasonic cleaning and then dried, wherein the circuit board cleaning agent is prepared from fatty alcohol-polyoxyethylene ether, amino acid, 5-methyl benzotriazole and an alcohol solvent; (2) the circuit board to be coated with the film is placed into a vacuum coating chamber, heated and vacuumized; (3) coating raw materials are placed into an evaporation chamber, vacuumizing continues, and the coating raw materials are heated and sublimated; (4) the evaporation chamber is made to communicate with a cracking chamber, and the sublimated coating raw materials enter the cracking chamber to be cracked into active monomers; and (5) the active monomers enter the vacuum coating chamber and are finally deposited on the surface of the circuit board to form the waterproof film. The waterproof film has the characteristics of being good in waterproof effect, low in coating cost, good in permeability and good in cooling performance.

Description

technical field [0001] The invention relates to the technical field of circuit board waterproof coating, in particular to a preparation method of circuit board nano waterproof film. Background technique [0002] Circuit boards are also called circuit boards, PCB boards, aluminum substrates, high-frequency boards, thick copper boards, impedance boards, PCBs, ultra-thin circuit boards, ultra-thin circuit boards, printed (copper etching technology) circuit boards, etc. The surface of the circuit board is printed with a lot of conductive circuits, or soldered with many electronic components, which play an extremely critical role in smart devices. [0003] The circuit board relies on the signal conduction in the conductive circuit, so the circuit board cannot touch the water, otherwise it will easily cause a short circuit or direct damage. Therefore, the circuit board must have waterproof function. [0004] There are three types of existing circuit board waterproofing: [0005...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/12C23C14/24C23C14/02
CPCC23C14/021C23C14/12C23C14/24
Inventor 肖桥兵
Owner GUANGDONG YINENG NANO SCI & TECH
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