Siloxane-Modified Polyurethane Coating for Gas-Permeable Thin Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polyurethane and silicone resin compositions for gas separation membranes face challenges such as high production costs, complex purification processes, curing inhibition, and insufficient strength and flexibility, making them unsuitable for continuous film formation.
Innovation Solution
A siloxane-modified polyurethane resin coating agent composition is developed, comprising a siloxane-modified polyurethane resin and a volatile organic solvent with specific components, allowing for easy synthesis and formation of a thin film with high tensile strength and gas permeability through solvent drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PIM-1 resin is used for high gas permeability, then gas permeability is improved, but film shrinkage occurs during solvent volatilization and industrial use becomes difficult
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin from pure PIM-1 to a copolymer containing PIM-1 units combined with other polymer units (such as polyether or polyester chains). This compositional parameter change reduces film shrinkage during solvent volatilization while maintaining high gas permeability, enabling stable continuous film formation for industrial gas separation membrane production
2Ease of operation
If addition curable silicone resin composition is used for easy film formation, then ease of operation is improved, but curing inhibition occurs when hetero atom containing groups are present
Solution Approach 1:
The invention extracts and eliminates the problematic functional groups (amino groups and other hetero atom containing groups) from the composite material that cause platinum catalyst poisoning. By removing these harmful components, the addition curable silicone resin composition can be used without curing inhibition, enabling easy film formation while maintaining complete curing
Solution Approach 2:
The invention replaces expensive and complex condensation-curable silicone resin systems with more economical addition curable systems. Although addition curable resins are sensitive to hetero atoms, the invention makes them usable by removing the problematic groups, thereby adopting a simpler, more cost-effective curing mechanism for continuous film production
3Reliability
If condensation-curable silicone resin composition is used to avoid curing inhibition, then curing completeness is improved, but film strength becomes low and continuous production is unsuitable
Solution Approach 1:
The invention replaces condensation-curable silicone resin with addition curable silicone resin, adopting a more economical and efficient curing system. By removing hetero atom containing groups from composite materials, the invention enables addition curing to proceed completely without inhibition, achieving both high film strength and suitability for continuous production
Solution Approach 2:
The invention uses composite materials consisting of silicone resin combined with polyurethane or polyester resin components. This composite binder resin system provides both the ease of addition curing and the mechanical strength required for thin film formation, while maintaining compatibility with composite materials free of hetero atom containing groups
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 composition enables the production of a thin film with excellent gas permeability, strength, and flexibility at lower costs, suitable for continuous film formation without curing inhibition.
Implementation Method 1
by drying and removing a volatile organic solvent
Data Source
AI summary
A siloxane-modified polyurethane resin coating agent composition which includes: (A) a siloxane-modified polyurethane resin; and (B) a solvent, wherein component (A) is a cured product of a composition including: (a) a hydroxyl group-containing organosilicon compound having the formula (1): (R13SiO1/2)k(R12SiO2/2)p(R1SiO3/2)q(SiO4/2)r (1) wherein R1 is a group selected from the following formulas (2) and (3) or the like, k, p, q, and r are predetermined integers, wherein R2 to R4 are each hydrogen or the like, and x, y, z, s, t, and u are predetermined numbers; (b) a diisocyanate compound; and (c) an organic compound such as polyols, wherein (c) is m moles, (b) is (1+m) × (0.9 to 1.2) moles each per 1 mole of (a), and m is 0.2 moles or more and less than 1.6 moles, and wherein a content of component (B) is 50 to 98% by weight.