Gel Conformal Coating for Durable PCB Insulation Without Masking
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Solution Overview
Problem
Traditional conformal coatings for electronic devices are not durable enough to withstand harsh environments, often leading to corrosion and failure, and require masking of components to prevent electrical interference, which is costly and time-consuming.
Innovation Solution
A gel-state coating composition that is deformable, flowable, and electrically insulating, composed of film formers and additives such as passivators and antioxidants, which migrates to interfaces to enhance durability and prevent chemical and mechanical degradation, eliminating the need for masking during application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conformal coatings increase mechanical strength to improve durability, then the coating becomes hard and rigid, but this requires compromises during manufacturing such as masking or selective coating
Solution Approach 1:
The patent changes the physical-chemical parameters of the coating by introducing a gel state with specific rheological properties (yield stress, viscoelasticity) that differ from traditional liquid or solid coatings. This allows the coating to exhibit both durability and deformability simultaneously, resolving the contradiction between mechanical strength and manufacturing ease.
Solution Approach 2:
The patent creates a composite gel coating system combining polymer matrices with gel-forming agents and functional additives. This composite structure provides enhanced mechanical strength and durability while maintaining the deformability needed to avoid masking, thus resolving the contradiction between reliability and ease of manufacture.
2Reliability
If traditional coatings are applied to protect electronic devices from harsh environments, then electrical insulation is improved, but the coating may inhibit flow of electric current through connectors, test points, or grounding contacts
Solution Approach 1:
The patent applies the dynamics principle by creating a coating that can change its state from rigid to deformable on demand. The gel coating can deform under applied force to allow electrical connections to be made or modified, then return to its insulating state, thus maintaining both electrical insulation and operational flexibility.
Solution Approach 2:
The patent changes the rheological parameters of the coating to create a gel state with yield stress properties. This allows the coating to maintain its insulating integrity under normal conditions but deform when sufficient force is applied during assembly or testing, enabling electrical functionality without compromising insulation.
3Object-affected harmful factors
If traditional conformal coatings are used to protect electronic devices, then some protection is provided, but the coatings are not durable enough to withstand harsh environments leading to corrosion and failure
Solution Approach 1:
The patent employs composite materials by formulating a gel coating system that combines polymer matrices with gel-forming agents, passivators, antioxidants, and other functional additives. This composite structure provides superior protection against environmental stresses including corrosion, oxidation, and chemical degradation, significantly improving durability in harsh environments.
Solution Approach 2:
The patent applies self-service through self-healing mechanisms where the gel coating can autonomously repair minor damages and maintain its protective properties over time. The viscoelastic nature of the gel allows it to flow and seal small cracks or defects, maintaining continuous protection without external intervention.
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 gel-state coating provides improved durability and protection against environmental stresses, maintaining electrical insulation and mechanical integrity while allowing for seamless integration with electronic components without interfering with electrical functionality.
Implementation Method 1
additives such as passivators and antioxidants, which migrates to interfaces to enhance durability and prevent chemical and mechanical degradation
Implementation Method 2
durable electrically-insulating coatings are becoming a more popular form of protection of such devices
Implementation Method 3
the disclosed coating can be used in a variety of applications when applied to various devices or substrates... while also retaining the ability to deform and flow
Data Source
AI summary
There is disclosed a composition for forming a conformal gel coating to protect a substrate from various environments, wherein the composition comprises at least one film former, at least one additive and optionally at least one solvent. The composition is deformable, flowable, electrically insulating, and does not contain fluorine when applied as a coating. Gel coatings, methods of applying such coating to substrates, as well as the coated substrates are also disclosed. Non-limiting examples of such substrates include a printed circuit board, an assembled electronic device or an automotive part.