Hydrophilizing Layer for Durable Wetting of Hydrophobic Substrates
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Solution Overview
Problem
Current methods for hydrophilizing low surface energy substrates, such as polyolefin polymers, result in temporary hydrophilic properties due to surfactant wash-off or charge dissipation, leading to limited durability and undesirable alterations in water properties.
Innovation Solution
A hydrophilizing layer comprising organophosphorus materials and vinyl alcohol materials is applied to the substrate, providing a durable hydrophilic surface by reducing the water contact angle and increasing surface energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surfactant treatment is applied to hydrophobic substrate, then hydrophilic properties are achieved, but durability is poor due to wash-off
Solution Approach 1:
The invention uses a composite material consisting of a polyolefin substrate combined with a hydrophilic polymer coating layer. This composite structure allows the substrate to maintain its inherent properties while the coating layer provides durable hydrophilic characteristics that resist wash-off, solving the contradiction between achieving hydrophilic properties and maintaining durability.
Solution Approach 2:
The invention changes the surface energy parameters of the substrate by applying a hydrophilic polymer coating. This coating modifies the surface chemistry without altering the bulk properties of the polyolefin substrate, achieving durable hydrophilic properties through parameter transformation at the surface level.
2Reliability
If high energy treatment is applied to substrate, then hydrophilic properties are achieved, but charges dissipate particularly in thermoplastic polymers
Solution Approach 1:
The invention creates a composite structure where a hydrophilic polymer coating is applied over the thermoplastic polymer substrate. This coating layer stabilizes the surface charges and prevents their dissipation, while allowing the substrate to maintain its thermoplastic properties, thus resolving the contradiction between achieving hydrophilic properties and maintaining charge stability.
3Ease of manufacture
If surfactants are rinsed off substrate by water exposure, then substrate is cleaned, but water properties are altered by lowering surface tension
Solution Approach 1:
The invention extracts and removes surfactants from the treatment process by using a hydrophilic polymer coating that can be applied without requiring surfactant rinsing. The coating is applied through methods such as dip-coating or spray-coating followed by drying, eliminating the need for water rinsing that would otherwise alter water surface tension and cause environmental issues.
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 solution effectively renders hydrophobic surfaces more hydrophilic, maintaining durability even when exposed to water, as evidenced by reduced rinse-off and improved strikethrough times in absorbent applications.
Implementation Method 1
providing a durable hydrophilic surface by reducing the water contact angle and increasing surface energy
Implementation Method 2
A hydrophilizing layer comprising organophosphorus materials and vinyl alcohol materials is applied to the substrate, providing a durable hydrophilic surface
Data Source
AI summary
A hydrophilized article includes (a) a substrate having a hydrophobic surface, and (b) a hydrophilizing layer disposed on at least a portion of the hydrophobic surface of the substrate. said layer comprising an organophosphorus material or a vinyl alcohol material, or a mixture of an organophosphorus material and a vinyl alcohol material.