Water/Oil Repellent Copolymer for Wash and Heavy-Rain Durability
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Solution Overview
Problem
Existing water/oil repellent compositions lose their effectiveness when exposed to heavy rain, lacking durability in such conditions.
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 20-30 carbon alkyl group, and vinylidene chloride, along with a cross-linkable functional group, to enhance wash and heavy-rain durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing water/oil repellent compositions are used, then water/oil repellency is provided, but water/oil repellency deteriorates when exposed to heavy rain
Solution Approach 1:
The invention uses a copolymer comprising multiple types of polymerized units (polymerized units from monomer having a polyfluoroalkyl group, polymerized units from (meth)acrylate with specific alkyl group, and polymerized units from vinylidene chloride) to create a composite material structure that provides both water/oil repellency and heavy-rain durability through the synergistic effects of different functional units
Solution Approach 2:
The invention specifies precise compositional parameters including the proportion of polymerized units from (meth)acrylate with 20-30 carbon atoms in the total copolymer (5-50 mass%) and the ratio between monomer (b) and monomer (a) + monomer (b) (10-70 mol%) to optimize both repellency and durability properties
2Reliability
If existing water/oil repellent compositions are used, then water/oil repellency is provided, but wash durability is insufficient
Solution Approach 1:
The copolymer combines polymerized units from vinylidene chloride with polymerized units from fluorinated monomers and (meth)acrylates, creating a composite structure where vinylidene chloride units contribute to durability and wash resistance while maintaining the water/oil repellency properties provided by the fluorinated and hydrocarbon units
Solution Approach 2:
The invention controls the proportion of polymerized units from vinylidene chloride (5-40 mass%) and the proportion of polymerized units from (meth)acrylate with 20-30 carbon atoms (5-50 mass%) to achieve optimal balance between wash durability and repellency performance
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 provides excellent water/oil repellency with improved durability against washing and heavy rain, maintaining performance without significant deterioration.
Implementation Method 1
a copolymer having polymerized units derived from the following monomer (a), polymerized units derived from the following monomer (b) and polymerized units derived from the following monomer (c): monomer (a): a compound of following formula (1): (Z-Y) n X (1) where Z is a C 1-6 perfluoroalkyl group
Implementation Method 2
a water/oil repellent composition which can give water/oil repellency to a surface of an article
Data Source
AI summary
To provide a water/oil repellent composition which can give water/oil repellency to a surface of an article and has excellent durability (wash durability and heavy-rain durability), a method for producing such a composition, and an article which has water/oil repellency and is less susceptible to deterioration of water/oil repellency when it is washed or in heavy rain. A water/oil repellent composition which comprises a copolymer having polymerized units derived from monomer (a), polymerized units derived from monomer (b) and polymerized units derived from monomer (c). Here, monomer (a) is a compound represented by the formula: (Z-Y)nX; wherein Z is a C1-6 perfluoroalkyl group or the like; Y is a bivalent organic group or a single bond; n is 1 or 2; and X is a polymerizable unsaturated group; monomer (b) is a (meth)acrylate having no polyfluoroalkyl group and having an C20-30 alkyl group; and monomer (c) is vinylidene chloride.