Parylene Copolymer Coating for Moisture and UV Protection
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Solution Overview
Problem
Conventional protective coatings lack effective moisture resistance and UV protection for moisture-sensitive substrates, particularly in electronic devices, leading to potential damage from accidental exposure to moisture and UV light.
Innovation Solution
A coating apparatus and method using a mixture of parylene C and parylene F dimers, processed through vaporizers and pyrolysis chambers, forming a copolymer that is deposited as a protective layer on electronic devices, providing both moisture resistance and UV protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective coatings are used, then the substrate is protected to some extent, but the moisture resistance and UV protection are insufficient
Solution Approach 1:
The patent uses a composite coating system comprising multiple layers with different functionalities: a fluorinated polymer topcoat for UV resistance and moisture repellency, and a parylene basecoat for moisture barrier protection. This composite structure combines the advantages of different materials to simultaneously achieve UV protection and moisture resistance, resolving the contradiction between protecting against moisture while also defending against UV damage.
2Ease of manufacture
If a single-layer coating is applied, then the manufacturing process is simple, but the protection against multiple environmental factors is insufficient
Solution Approach 1:
The protective coating is segmented into multiple functional layers: a fluorinated polymer topcoat (containing fluorine atoms for UV resistance and hydrophobicity) and a parylene basecoat (for moisture barrier properties). Each layer is optimized for specific protective functions, allowing the coating system to provide comprehensive protection against multiple environmental factors while maintaining a relatively simple two-step manufacturing process.
3Reliability
If the coating is made more resistant to moisture and UV, then the protection effectiveness increases, but the coating complexity increases
Solution Approach 1:
The patent employs composite materials where a fluorinated polymer topcoat is applied over a parylene basecoat. The fluorinated polymer provides UV resistance and hydrophobic properties, while the parylene layer provides the moisture barrier. This composite approach achieves high environmental resistance without excessive complexity by selecting materials with complementary properties and using a straightforward multi-layer deposition process.
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 copolymer coating effectively prevents moisture and UV exposure, enhancing the durability and reliability of electronic devices by maintaining performance and preventing damage from environmental factors.
Implementation Method 1
a first vaporizer configured to vaporize a first precursor material, a second vaporizer configured to vaporize a second precursor material
Implementation Method 2
at least one pyrolysis chamber configured to further process vaporized precursor material from one of the first vaporizer or second vaporizer
Implementation Method 3
The copolymer includes a fluoropolymer... the copolymer includes a hydrophobic material... providing both moisture resistance and UV protection
Data Source
AI summary
A coating apparatus includes a first vaporizer configured to vaporize a first precursor material, a second vaporizer configured to vaporize a second precursor material in series with the first vaporizer, at least one pyrolysis chamber configured to further process vaporized precursor material from one of the first vaporizer or second vaporizer, and a deposition chamber configured to receive the processed precursor materials.