Fluorinated Water-Repellent Composition That Preserves Antistaticity
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Solution Overview
Problem
Existing water repellent compositions for medical gowns that replace perfluoroalkyl groups with shorter chain alkyl groups compromise antistatic properties when increasing alkyl chain length to maintain water and alcohol repellency, leading to higher hydrophilicity and reduced repellency, while also posing environmental concerns due to the use of fluorinated copolymers with long chain alkyl groups.
Innovation Solution
A water repellent composition comprising a fluorinated copolymer with structural units based on specific monomers, including a C1-6 polyfluoroalkyl group, a (meth)acrylate with a C1-6 alkyl group, and a halogenated olefin, which maintains antistatic properties and provides sufficient water and alcohol repellency without environmental impact by adjusting the monomer proportions and incorporating crosslinkable functional groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluoroalkyl groups with at least 8 carbon atoms are used, then water repellency and alcohol repellency are improved, but environmental impact increases
Solution Approach 1:
The patent changes the carbon chain length parameter of the fluorinated copolymer by limiting the perfluoroalkyl group to 6 or fewer carbon atoms. This parameter reduction decreases the environmental persistence and bioaccumulation potential of the copolymer while the cyclic ether or cyclic carbonate structures compensate for any loss in repellency performance.
Solution Approach 2:
The patent adopts shorter chain perfluoroalkyl groups (6 carbons or fewer) that are less persistent in the environment and break down more easily, replacing the longer chain groups (8+ carbons) that have high environmental impact. This approach prioritizes environmental sustainability while maintaining functional performance through the cyclic structure modifications.
Data Source
AI summary
To provide a water repellent composition which is capable of imparting sufficient water repellency and alcohol repellency to a hydrophobic substrate without significantly decreasing the antistatic property imparted to the hydrophobic substrate by an antistatic agent, and which presents a low environmental impact, its production method, a hydrophobic substrate treating agent composition and an article. A water repellent composition having a fluorinated copolymer having structural units based on a monomer (a) having a C1-6 polyfluoroalkyl group, structural units based on a monomer (b) having a C1-6 alkyl group and structural units based on a monomer (c) (halogenated olefin), and a medium, where the proportion of the structural units based on the monomer (a) is from 50 to 90 mass % of the structural units (100 mass %) based on all the monomers.