Polymeric Barrier Membrane for Reusable Protective Garments
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Solution Overview
Problem
Existing protective garments fail to provide effective barriers against noxious agents while maintaining breathability and flexibility, as they often inhibit water vapor transmission and have limited adsorption capacity, and are not reusable due to poor chemical protection after laundering.
Innovation Solution
A composition comprising 5-80% polyvinyl acetate polymer or copolymer, 5-20% aliphatic amine, 0-20% polyvinyl alcohol, 0.1-10% surfactant, 0-5% metal salts or oxides, 0.1-10% epoxy resin or cross-linking agent, and 0.5-10% defoamer, applied to a solid support and cured at 100-220°C, enhancing water resistance, adhesion, and breathability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If hydrophilic polymers like polyethylenimine, polyvinyl alcohol, or polyvinyl alcohol co-ethylene are used to achieve high water vapor transmission, then breathability is improved, but chemical protection after laundering deteriorates
Solution Approach 1:
The patent uses a composite material system comprising polyvinyl acetate polymer (5-80% by weight) combined with aliphatic amine (5-20% by weight), polyvinyl alcohol (0-20% by weight), and cross-linking agents (0.1-10% by weight). This composite formulation creates a membrane that maintains high water vapor transmission while achieving superior chemical protection and wash durability through the synergistic interaction of multiple components, resolving the contradiction between breathability and laundering resistance
Solution Approach 2:
The patent modifies the chemical and physical parameters of the protective membrane by controlling the molecular weight, degree of hydrolysis, and cross-linking density of the polymer components. By adjusting these parameters, the membrane achieves optimal balance between water vapor transmission and chemical barrier properties, enabling reusable protective clothing that maintains performance after multiple launderings
2Illumination intensity
If carbon based technologies are used to allow water vapor transmission, then breathability is improved, but adsorption capacity deteriorates
Solution Approach 1:
The patent creates local quality differentiation within the membrane structure by incorporating hydrophilic domains (through polyvinyl alcohol and aliphatic amine) that provide both water vapor transmission pathways and chemical adsorption sites. This local quality approach allows different regions of the membrane to simultaneously perform vapor transmission and chemical adsorption functions, resolving the contradiction between breathability and adsorption capacity
3Reliability
If disposable protective clothing is used to ensure effectiveness, then protection reliability is improved, but environmental impact worsens
Solution Approach 1:
The patent enables recovery and reuse of protective clothing by formulating a durable membrane that maintains its protective properties after multiple launderings. The cross-linked polymer structure and surfactant-modified surface provide long-lasting chemical barrier properties, allowing the same garment to be reused multiple times without significant degradation, thereby reducing waste and environmental impact while maintaining protection reliability
4Reliability
If existing impermeable materials are used to block noxious agents, then chemical protection is improved, but water vapor transmission deteriorates
Solution Approach 1:
The patent employs a porous membrane structure with controlled pore size and distribution that allows water vapor molecules to pass through while blocking larger noxious chemical agents. The hydrophilic polymer components create capillary pores that facilitate vapor transmission through capillary action, while the overall membrane architecture maintains chemical barrier properties, resolving the contradiction between chemical protection and breathability
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 provides enhanced resistance to water and laundering, maintaining effective barrier properties against noxious agents and chemical warfare agents, with improved adhesion and breathability, allowing for reusable protective garments.
Implementation Method 1
selectively permeable materials are permeable only to water vapor as opposed to chemical, noxious or harmful agents
Implementation Method 2
clothing incorporating various impermeable and adsorptive materials has been used
Implementation Method 3
curing the resulting laminated support at a temperature in the range of 100 to 220° C.
Implementation Method 4
from 0.1 to 10% by weight of an epoxy resin or of a cross-linking agent
Implementation Method 5
from 0.1 to 10% by weight of a surfactant
Data Source
AI summary
The present application is directed to a novel composition which acts as a barrier to noxious agents while showing enhanced moisture vapour permeability and resistance to water and laundering.