Flame-Resistant Fabric Finish for Water Repellency and Abrasion Resistance
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Solution Overview
Problem
Existing flame-resistant fabrics lack water repellency and surface abrasion resistance, leading to reduced durability and increased frequency of replacement, especially for protective garments used by firefighters and emergency responders, and there is a need for fluorine-free alternatives due to safety concerns with alkylfluoropolymers.
Innovation Solution
Development of water-repellent and flame-resistant fabrics using spun yarns with a finish comprising hydrocarbon-based, silicone-based, or urethane-based polymers, along with a polymeric abrasion resistance aid, which imparts water repellency and abrasion resistance without using alkylfluoropolymers, maintaining flame resistance and durability through multiple launderings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkylfluoropolymer finishes are used to impart water repellency, then water repellency is improved, but safety and environmental compliance deteriorate due to perceived unsafe properties of fluoro-based chemistries
Solution Approach 1:
The patent changes the chemical composition parameters of the finish by replacing alkylfluoropolymer with alternative polymers (polyurethane, acrylic, silicone, or hydrocarbon-based polymers). This substitution maintains the water repellency function while eliminating the harmful fluorinated chemicals, thus resolving the contradiction between water repellency and safety compliance
Solution Approach 2:
The patent employs conventional, well-established polymer materials that are safer and more environmentally friendly compared to specialized fluoro-based chemistries. These alternative polymers provide comparable water repellency without the safety concerns, effectively replacing the problematic substance with safer alternatives
2Ease of manufacture
If conventional finishes are applied to flame resistant fabrics, then ease of manufacture is improved, but abrasion resistance deteriorates leading to frequent garment replacement
Solution Approach 1:
The patent creates a composite finish system that combines water repellent agents with polymeric abrasion resistance aids. This composite approach integrates multiple functions (water repellency and abrasion resistance) into a single finish application process, maintaining ease of manufacture while significantly improving abrasion resistance and garment durability
Solution Approach 2:
The patent merges the water repellency function and abrasion resistance function into a single integrated finish treatment. By combining water repellent agents with polymeric abrasion resistance aids in one finish application, the process remains simple and manufacturable while achieving both protective functions simultaneously
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 treated fabrics exhibit improved water absorption resistance and abrasion resistance, meeting industry standards for flame resistance and water repellency, extending the lifespan of protective garments while ensuring safety and environmental compliance.
Implementation Method 1
a water repellent agent selected from the group consisting of a hydrocarbon-based polymer, a silicone-based polymer, a urethane-based polymer, and an acrylic-based polymer
Implementation Method 2
a polymeric abrasion resistance aid
Data Source
AI summary
Fabrics that are exhibit water repellency, abrasion resistance, and optionally flame resistance are described herein. The fabrics include a plurality of fibers (such as flame resistant fibers) and a finish that imparts water repellency and abrasion resistance to the fibers. The fabrics are free or substantially free from alkylfluoropolymers. Also described herein are garments including the fabrics.