Protective Layer on Siloxane Resin Gas Separation Membrane
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Solution Overview
Problem
Gas separation membranes with resin layers containing siloxane bonds often experience decreased gas permeation performance due to brittleness and defects during winding or simple contact, leading to poor performance before and after abrasion resistance tests.
Innovation Solution
A protective layer is applied to the resin layer containing a siloxane bond, specifically formed by surface oxidation treatment, to enhance durability and maintain high gas permeation performance, satisfying conditions related to O/Si ratios, ESCA depth profiling, and positron lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin layer containing siloxane bonds is used to achieve gas separation, then gas separation selectivity is improved, but the resin layer becomes brittle and develops defects during winding or contact, worsening reliability and gas permeation performance
Solution Approach 1:
The patent applies composite materials by combining the siloxane-containing resin layer with a protective layer made of different materials (polyimide, polyether sulfone, or fluororesin). This composite structure allows the siloxane layer to provide gas separation selectivity while the protective layer provides mechanical strength and prevents brittleness-related defects during winding and handling, thus resolving the contradiction between gas separation performance and mechanical reliability.
2Productivity
If the resin layer is made thinner to increase gas permeability, then gas permeation performance is improved, but the layer becomes more susceptible to defects and brittleness, worsening reliability
Solution Approach 1:
The protective layer in the composite structure compensates for the reduced mechanical strength inherent in thinner resin layers. This allows the gas separation membrane to achieve high gas permeability through optimized thickness while the protective layer prevents defects from forming during winding and handling, thus resolving the contradiction between productivity and reliability.
3Reliability
If surface oxidation treatment is applied to enhance gas separation performance, then gas permeation selectivity is improved, but the resin layer becomes more brittle, worsening durability during winding and contact
Solution Approach 1:
The protective layer protects the surface-oxidized resin layer from mechanical stress during winding and contact. The composite structure allows the oxidized surface to maintain its enhanced gas separation performance while the protective layer prevents the brittle oxidized layer from developing defects, thus resolving the contradiction between gas permeation performance and durability during processing.
4Reliability
If a protective layer is added to improve durability and gas permeation stability, then reliability is improved, but device complexity increases
Solution Approach 1:
The protective layer is applied selectively to specific surfaces of the gas separation membrane where mechanical stress and contact occur during winding and handling. This localized protection approach provides the necessary durability and gas permeation stability without adding complexity to the entire membrane structure, thus resolving the contradiction between reliability and device complexity.
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 protective layer significantly improves gas permeation performance both before and after abrasion resistance tests without reducing permeability, addressing the brittleness and defect issues of the resin layer, and provides unexpected high gas permeation and durability.
Implementation Method 1
A protective layer is applied to the resin layer containing a siloxane bond, specifically formed by surface oxidation treatment, to enhance durability and maintain high gas permeation performance
Implementation Method 2
specifically formed by surface oxidation treatment
Implementation Method 3
Materials made of polymer compounds have gas permeability specific to each material. Due to this nature, selective permeation and separation of a gas component of interest can be achieved by using a membrane (gas separation membrane) formed of a particular polymer compound
Data Source
AI summary
A method for producing a protective-layer-covered gas separation membrane includes forming a gas separation membrane having a resin layer containing a compound having a siloxane bond and satisfying a particular condition by surface oxidation treatment of a resin layer precursor containing a siloxane bond; and providing a protective layer on the resin layer before winding. A protective-layer-covered gas separation membrane is produced by the method for producing a protective-layer-covered gas separation membrane. A gas separation membrane module and a gas separation apparatus are produced by the method for producing a protective-layer-covered gas separation membrane.