Black Porous PTFE Membrane With Heat-Resistant Color Stability
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Solution Overview
Problem
Conventional colored porous PTFE membranes are prone to color fading when exposed to high temperatures or light, which affects their appearance and functionality in applications like electronic device housings.
Innovation Solution
A black porous PTFE membrane is developed with a whiteness of 18.0 to 23.0% on its principal face, achieved through a dyeing process using a high-melting-point azine-based dye, and is resistant to color fading after heating at 350°C for 1 minute, ensuring durability and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a porous PTFE membrane is dyed black to reduce conspicuity, then the aesthetic quality and design appearance are improved, but the membrane becomes prone to color fading when exposed to high temperature or light
Solution Approach 1:
The patent changes the chemical parameters of the dye by selecting an azine-based dye with specific molecular structure and high melting point characteristics. This parameter change in the dye's chemical properties enables it to resist degradation from heat and light exposure while maintaining black coloration, thus resolving the contradiction between aesthetic appearance and color fading resistance
Solution Approach 2:
The patent creates a composite system by combining PTFE membrane with azine-based dye molecules that have high thermal stability. The interaction between the PTFE substrate and the specialized dye forms a composite structure where the dye molecules are firmly anchored to the membrane, preventing color fading while maintaining the desired black appearance for aesthetic purposes
2Reliability
If a white porous PTFE membrane is used, then the membrane provides good sound transmitting properties and waterproof performance, but it is conspicuous and may lead to damage from user curiosity
Solution Approach 1:
The patent applies color change by dyeing the PTFE membrane black using azine-based dye. This color modification makes the membrane less conspicuous when installed on electronic devices, reducing the risk of user curiosity-induced damage, while the membrane's fundamental waterproof and sound transmitting properties remain intact
3Ease of manufacture
If conventional dyes are used to color the PTFE membrane, then the manufacturing process is simple, but the color fades rapidly under heat and light exposure
Solution Approach 1:
The patent changes the key parameter of the dye's melting point and thermal stability by selecting azine-based dyes with high melting points. This parameter change allows the dye to withstand high temperature and light exposure without degrading, significantly extending color durability while the dyeing process itself remains relatively simple and compatible with existing manufacturing procedures
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 black porous PTFE membrane maintains its color integrity under heat and light exposure, providing improved color fading resistance and maintaining its properties as a gas-permeable, waterproof, and dustproof membrane for electronic devices.
Implementation Method 1
a dyeing step of dyeing black the sheet-shaped body stretched in the first direction
Implementation Method 2
a gas-permeable membrane that blocks entry of water and allows permeation of gases
Data Source
AI summary
Provided is a black porous polytetrafluoroethylene membrane including a porous polytetrafluoroethylene membrane dyed black. A whiteness of a principal face of the black porous polytetrafluoroethylene membrane as measured according to JIS L 1015 (Hunter method) is 18.0 to 23.0%, and the whiteness of the principal face falls within a range of 18.0 and 25.0% after heating at 350° C. for 1 minute. This black porous PTFE membrane is suitable as a gas-permeable membrane that blocks entry of water and/or dust and that allows permeation of gases; specifically, the black porous PTFE membrane is suitable, for example, as a waterproof sound-transmitting membrane, a waterproof gas-permeable membrane, and a dustproof gas-permeable membrane.