Water repellent composition, method for producing water repellent composition, and article
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Solution Overview
Problem
Existing water repellent compositions are insufficient in hot water repellency and dry soil resistance, particularly for articles like carpets, which require effective repulsion of hot liquids and easy removal of dry soil.
Innovation Solution
A water repellent composition comprising a copolymer with structural units based on a C4-6 perfluoroalkyl group, (meth)acrylate with a cyclic hydrocarbon group, vinylidene chloride, and a crosslinkable functional group, combined with a film-forming assistant, to enhance hot water repellency and dry soil resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing water repellent compositions are used, then water repellency against low-temperature water is achieved, but hot water repellency is insufficient
Solution Approach 1:
The invention uses a composite copolymer structure combining fluorinated monomer units (for water repellency), (meth)acrylate units with cyclic hydrocarbon groups (for high Tg and hot water resistance), and crosslinkable functional group units (for durability). This composite material approach enables the coating to maintain water repellency at high temperatures while preserving low-temperature performance.
Solution Approach 2:
The invention changes the glass transition temperature parameter of the polymer by selecting (meth)acrylate monomers with cyclic hydrocarbon groups that have Tg of at least 20°C. This parameter change enables the coating to maintain its water repellent properties at elevated temperatures where conventional low-Tg polymers would fail.
2Reliability
If existing water repellent compositions are used, then water repellency is achieved, but dry soil resistance is insufficient
Solution Approach 1:
The composite copolymer structure includes crosslinkable functional groups that form a durable, flexible network on the article surface. This network provides mechanical strength to resist soil adhesion while maintaining flexibility to allow easy soil removal, solving the contradiction between durability and ease of cleaning.
3Temperature
If high-temperature drying processes are used to enhance hot water repellency, then hot water repellency is improved, but energy consumption and process complexity increase
Solution Approach 1:
The invention performs preliminary action by incorporating crosslinkable functional groups and film-forming assistants into the coating composition before application. These components enable the coating to self-assemble and form a durable film during air drying at ambient or low temperatures, eliminating the need for high-temperature drying while achieving the desired hot water repellency performance.
Solution Approach 2:
The film-forming assistant acts as an intermediary that facilitates film formation at low temperatures. It mediates between the polymer components and the drying process, enabling proper film assembly and crosslinking without requiring high energy input, thus achieving hot water repellency with minimal energy consumption.
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 achieves excellent hot water repellency and dry soil resistance, allowing for effective repulsion of hot liquids and easy removal of dry soil, even after air drying, without the use of high-temperature drying processes.
Implementation Method 1
a copolymer having structural units based on a fluorinated monomer having a C1-6 polyfluoroalkyl group, structural units based on a (meth)acrylate having a cyclic hydrocarbon group
Implementation Method 2
structural units based on a fluorinated monomer having a C1-6 polyfluoroalkyl group
Implementation Method 3
structural units based on a monomer having a crosslinkable functional group
Implementation Method 4
combined with a film-forming assistant, to enhance hot water repellency and dry soil resistance
Implementation Method 5
allowing for effective repulsion of hot liquids and easy removal of dry soil, even after air drying
Data Source
AI summary
To provide a water repellent composition whereby it is possible to obtain an article having excellent hot water repellency and dry soil resistance, a method for producing the water repellent composition, and an article excellent in hot water repellency and dry soil resistance. The water repellent composition comprises a copolymer having structural units based on monomer (a), structural units based on monomer (b), and structural units based on monomer (c) in specific proportions, and an aqueous medium. Monomer (a): compound represented by RF-Q-Z-C(O)C(R)=CH2 (RF: C4-6 perfluoroalkyl group, Q: divalent hydrocarbon group or single bond, Z: -O- or -NH-, R: methyl group or chlorine atom). Monomer (b): (meth)acrylate having cyclic hydrocarbon group, of which the homopolymer has a glass transition temperature of at least 50°C. Monomer (c): vinylidene chloride.