Vinyl Ester Modified Coating Composition for Liquid Stain Repellency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vinyl acetate (VA)-based coating films tend to be hydrophilic, resulting in poorer liquid stain repellency, and require high wax content to improve stain resistance, which is undesirable.
Innovation Solution
A coating composition with a balanced formulation of 12% to 80% polymer particles, 0.1% to 6% wax, and 14% to 55% pigment, including 25% to 90% vinyl acetate and 5% to 75% vinyl ester of versatic acid or 2-ethyl hexanoic acid, along with optional (meth)acrylate monomers and stabilizers, to enhance liquid stain repellency while minimizing wax usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vinyl acetate-based binder is used to reduce cost, then manufacturing cost decreases, but liquid stain repellency deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder by incorporating vinyl esters of versatic acid and 2-ethyl hexanoic acid alongside vinyl acetate. This parameter change transforms the hydrophilic VA-based binder into a formulation with improved hydrophobicity and liquid stain repellency, resolving the contradiction between using inexpensive VA and achieving stain resistance.
Solution Approach 2:
The invention creates a composite binder system combining vinyl acetate with vinyl esters of versatic acid and 2-ethyl hexanoic acid. This composite material approach allows the formulation to maintain the cost advantages of VA while incorporating the stain-repelling properties of the vinyl ester components, thereby resolving the cost versus performance contradiction.
2Reliability
If wax content is increased to improve liquid stain repellency, then stain resistance improves, but wax migration and surface blooming worsen
Solution Approach 1:
The patent changes the chemical parameters of the binder to include vinyl esters with specific molecular structures that provide inherent liquid stain repellency. This parameter change reduces the dependency on high wax content, allowing the use of lower wax levels (0.1-6% by dry weight) while maintaining stain resistance and preventing surface blooming.
Solution Approach 2:
The vinyl esters of versatic acid and 2-ethyl hexanoic acid act as intermediary substances that provide liquid stain repellency through the coating film without requiring high concentrations of wax. These intermediaries enable the system to achieve stain resistance at lower wax levels, preventing the harmful effects of excessive wax migration.
3Ease of manufacture
If vinyl acetate content is increased to reduce binder cost, then manufacturing cost decreases, but hydrophilicity increases and stain repellency worsens
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating vinyl esters of versatic acid and 2-ethyl hexanoic acid into the vinyl acetate-based binder. This parameter change reduces the overall hydrophilicity of the binder system while maintaining cost-effectiveness, as the vinyl esters provide hydrophobic character that counteracts the hydrophilic nature of vinyl acetate.
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 improved liquid stain repellency with reduced wax content, providing effective resistance to liquid stains without compromising film properties.
Implementation Method 1
Wax tends to migrate to the surface of dry coating films and reduces their surface tension, thereby improving their stain repellency
Implementation Method 2
Because of its hydrophilicity, it is not commonly used in coating formulations with liquid stain repellency requirement
Data Source
AI summary
A new coating composition comprising, by dry weight based on the total dry weight of the coating composition, i) from 12% to 80% of polymer particles comprising, as polymerized units, by dry weight based on the total dry weight of the polymer particles, from 25% to 90%, of a vinyl acetate; and from 5% to 75%, of a vinyl ester of versatic acid and/or a vinyl ester of 2-ethyl hexanoic acid; and ii) from 0.1% to 6% of a wax; and iii) from 14% to 55% of a pigment.