Bio-Based Urethane Coatings for Durable Non-Fluorinated Water Repellency
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Solution Overview
Problem
Current non-fluorinated water repellents for textiles are less effective compared to fluorinated counterparts and lack bio-based alternatives that provide durable water repellency and stain release.
Innovation Solution
A non-fluorinated organic urethane compound derived from bio-based organic compounds such as sorbitans, citrates, and pentaerythriols, formed by reacting isocyanates with isocyanate-reactive compounds, offering enhanced water repellency and stain release properties comparable to fluorinated treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated copolymers are used for water repellency treatment, then water repellency performance is improved, but environmental friendliness and sustainability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by using non-fluorinated hydrocarbon-based polymers (acrylic, polyurethane, polyester) instead of fluorinated copolymers, maintaining water repellency performance through alternative chemical structures that do not contain harmful fluorinated compounds
Solution Approach 2:
The patent employs conventional, readily available polymer materials (acrylic, polyurethane, polyester) that are easier to manufacture and dispose of compared to specialized fluorinated copolymers, reducing environmental persistence and harm while achieving comparable water repellency performance
2Object-affected harmful factors
If non-fluorinated copolymers are used as water repellents, then environmental friendliness is improved, but water repellency effectiveness deteriorates
Solution Approach 1:
The patent creates composite water repellent formulations by combining multiple non-fluorinated polymer types (acrylic, polyurethane, polyester) with complementary properties, where each polymer contributes different functional characteristics that together achieve effectiveness comparable to fluorinated copolymers
Solution Approach 2:
The patent selects polymer materials that can serve multiple functions: providing water repellency, ensuring durability through strong fiber bonding, and offering flexibility in formulation, thereby achieving comprehensive performance without relying on fluorinated chemistry
3Reliability
If traditional polyurethane polymers are used for moisture resistance, then water repellency is provided, but stain release capability and durability deteriorate
Solution Approach 1:
The patent divides the water repellent system into distinct functional segments: acrylic polymers provide initial water repellency, polyurethane polymers ensure durability and fiber bonding, and polyester components contribute to stain release capability, with each segment performing its specialized function
Solution Approach 2:
The patent merges multiple polymer systems (acrylic, polyurethane, polyester) into a single integrated water repellent formulation, combining their individual strengths to achieve both durable water repellency and stain release capability that traditional single-polymer systems cannot provide
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 bio-based urethane compound provides superior water repellency and durability, matching the performance of fluorinated treatments while being environmentally friendly and sustainable.
Implementation Method 1
reacting (a) at least one isocyanate group-containing compound selected from isocyanate, diisocyanate, polyisocyanate, or mixture thereof, and (b) at least one isocyanate-reactive compound
Implementation Method 2
non-fluorinated organic urethane compound useful for imparting durable water repellency to textiles
Data Source
AI summary
A compound for imparting water repellency and optionally stain release to substrates wherein the compound is prepared by (i) reacting (a) at least one isocyanate group-containing compound selected from isocyanate, diisocyanate, polyisocyanate, or mixture thereof, and (b) at least one isocyanate-reactive compound selected from formula (Ia), (Ib), or (Ic):