Nanofilm Coating for PCBA Waterproofing and Friction Reduction
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Solution Overview
Problem
Traditional coating processes for printed circuit board assemblies (PCBAs) often result in non-uniform and excessively thick protective films, failing to provide effective waterproofing and friction reduction due to angle-dependent vapor deposition methods.
Innovation Solution
A method involving the application of a polymer waterproof coating followed by inner and outer nanofilms composed of metal oxide and silicon dioxide nanoparticles, respectively, with specific particle size ranges, to achieve a thin, uniform, and bonded nanofilm structure that enhances waterproofing and reduces friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional coating process is used to form a protective film on PCBA, then the protective film provides basic protection, but the thickness becomes too thick or non-uniform distribution
Solution Approach 1:
The patent changes the particle size parameter of the coating material to nanometer scale (5-100 nm), which fundamentally alters the coating behavior. This enables formation of ultra-thin films (5-50 nm) with superior uniformity compared to traditional coating processes, while maintaining effective protection functionality
Solution Approach 2:
The patent uses composite nanoparticle systems including metal oxide nanoparticles (5-100 nm) and silicon dioxide nanoparticles (0.1-10 nm) that work synergistically. This composite approach enables both thin film formation and uniform distribution while providing enhanced protection compared to single-material coatings
2Length of stationary object
If a vapor deposition process is used to form a protective film on PCBA, then the film can be thin, but the distribution is non-uniform due to placed angles of electronic components
Solution Approach 1:
The patent replaces the mechanical vapor deposition process with a nanoparticle-based coating approach. The nanoparticle suspension can be applied through various methods (dipping, spraying, coating) that are not angle-dependent, enabling uniform coverage on components at any orientation while maintaining thin film thickness
Solution Approach 2:
By changing the material form from vapor phase to nanoparticle suspension phase, the patent enables coating processes that are insensitive to component placement angles. The nanometer-scale particles can conformally coat complex geometries regardless of orientation, achieving both thinness and uniformity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces a coated PCBA with a thin, continuous, and uniform nanofilm that effectively protects against moisture and reduces friction, significantly extending the operational life and performance of electronic components.
Implementation Method 1
removing the first solvent to form the inner coating with the metal oxide nanoparticles on the device by at least one of volatilization and pyrolysis techniques
Implementation Method 2
removing the first solvent to form the inner coating with the metal oxide nanoparticles on the device by at least one of volatilization and pyrolysis techniques
Implementation Method 3
baking the device at a temperature in a range of from about 50 °C to about 150 °C for a period of time in a range of from about 10 minutes to about 30 minutes after forming the waterproof coating
Data Source
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AI summary
A method for waterproofing a device and the resulting device are provided. The device includes a printed circuit board assembly (PCBA), which includes a printed circuit board, and at least one electronic component disposed on the printed circuit board. A waterproof coating such as a polymer coating is disposed on or in contact with at least one portion of the at least one electronic component. A nanofilm is disposed on the PCBA. The nanofilm includes an inner coating and an outer coating. The inner coating is disposed on the printed circuit board or in contact with the waterproof coating. The inner coating comprises metal oxide nanoparticles having a particle diameter in a range of about 5 nm to about 100 nm. The outer coating in contact with the inner coating, and comprises silicon dioxide nanoparticles having a particle diameter in a range of 0.1 nm to 10 nm.