Water/oil repellent composition, method for its production, and article
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Solution Overview
Problem
Existing water/oil repellent compositions fail to provide adequate oil repellency and heavy-rain durability while maintaining texture in treated articles.
Innovation Solution
A water/oil repellent composition comprising a copolymer with specific monomer units, including a C1-6 perfluoroalkyl group, a (meth)acrylate with a C20-30 alkyl group, and a poly(oxypolyfluoroalkylene) chain, along with optional halogenated olefin and crosslinkable functional groups, in a specific mass ratio, is used to enhance water and oil repellency and heavy-rain durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copolymer with polyfluoroalkyl groups and long alkyl groups is used to improve heavy-rain durability, then water repellency is improved, but oil repellency becomes insufficient
Solution Approach 1:
The copolymer is designed with locally distinct functional regions: polyfluoroalkyl groups (C1-6) provide water repellency and heavy-rain durability, while long alkyl groups (C20-30) provide oil repellency. This local differentiation of functional groups within the same polymer structure allows simultaneous achievement of both water and oil repellency without compromise.
2Object-affected harmful factors
If a copolymer with high proportion of long alkyl groups is used to improve oil repellency, then oil repellency is improved, but water repellency and heavy-rain durability are reduced
Solution Approach 1:
The copolymer structure incorporates locally distinct functional groups where polyfluoroalkyl groups (C1-6) are specifically positioned to provide water repellency and heavy-rain durability, while long alkyl groups (C20-30) are positioned to provide oil repellency. This local functional differentiation ensures that neither property compromises the other.
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 effectively imparts excellent water repellency, oil repellency, and heavy-rain durability to treated articles while maintaining a flexible texture, with improved adhesion and durability under various conditions.
Implementation Method 1
a copolymer having structural units based on a monomer having a polyfluoroalkyl group
Implementation Method 2
a (meth)acrylate having no polyfluoroalkyl group and having an alkyl group with at least 12 carbon atoms
Data Source
AI summary
To provide a water/oil repellent composition whereby it is possible to obtain an article which is excellent in each of water repellency, oil repellency and heavy rain durability, a method for its production, and an article which is excellent in each of water repellency, oil repellency, heavy rain durability and texture. The water/oil repellent composition comprises a copolymer containing structural units based on a monomer (a), structural units based on a monomer (b) and structural units based on a monomer (c). Here, the monomer (a) is a compound represented by (Z—Y)nX (wherein Z is a C1-6perfluoroalkyl group, etc.; Y is a bivalent organic group, etc.; n is 1 or 2; and X is a polymerizable unsaturated group). The monomer (b) is a (meth)acrylate having no polyfluoroalkyl group and having an alkyl group with at least 12 carbon atoms. The monomer (c) is a monomer having a poly(oxypolyfluoroalkylene) chain.