Aqueous Coating Compositions for Dirt-Proof and Abrasive Protection
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Solution Overview
Problem
Current coating technologies face challenges in providing substrates with simultaneous dirt-repellent, solvent-resistant, and abrasion-resistant properties, especially when exposed to a wide variety of liquids and solvents, and these requirements are often not met by existing single coating agents, particularly for porous or absorbent materials.
Innovation Solution
Aqueous coating compositions comprising copolymers of acrylic acid esters or methacrylic acid esters, crosslinkable polyurethanes with ethylenically unsaturated groups, and optional additives, specifically formulated with monomers like 2-ethylhexyl acrylate, n-butyl acrylate, and ethylenically unsaturated monomers with acid groups, which are polymerized to achieve desired glass transition temperatures and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coating agent is used to provide comprehensive protection, then the coating system becomes simpler, but it is difficult to meet all requirements (dirt-repellent, solvent-resistant, abrasion-resistant) simultaneously
Solution Approach 1:
The patent combines multiple coating agents with different functions into a single coating composition. Specifically, it merges a polyurethane coating agent (providing abrasion and chemical resistance) with a polymer latex coating agent (providing dirt-repellent properties), allowing the coating to simultaneously meet multiple performance requirements without requiring separate coating applications
Solution Approach 2:
The combined coating composition is designed to perform multiple functions simultaneously: it provides abrasion resistance, chemical resistance, and dirt-repellent properties all in one coating system. This multi-functional approach allows a single coating agent to address diverse protection needs that would traditionally require multiple specialized coatings
2Ease of operation
If coatings are designed for dirt-repellent properties, then washability improves, but abrasion resistance may be compromised
Solution Approach 1:
The patent merges a polyurethane coating agent (which provides abrasion resistance) with a polymer latex coating agent (which provides dirt-repellent and washable properties). This combination allows the coating to simultaneously achieve both abrasion resistance and ease of cleaning, resolving the contradiction between durability and washability
3Strength
If crosslinkable polymers are used to increase abrasion and chemical resistance, then durability improves, but the coating may become less flexible and more brittle
Solution Approach 1:
The patent combines a crosslinkable polyurethane coating agent with a polymer latex coating agent. The polyurethane component provides crosslinking for abrasion and chemical resistance, while the polymer latex component maintains flexibility and prevents brittleness. This merging allows the coating to achieve both durability and flexibility simultaneously
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 coating compositions achieve synergistic dirt-repellent, abrasion-resistant, and solvent-resistant properties, maintaining performance even with exposure to various liquids and solvents, including hydrophobic and hydrophilic substances, and show improved mechanical properties compared to coatings based solely on crosslinkable polyurethanes.
Implementation Method 1
aqueous coating compositions containing one or more copolymers of acrylic acid esters or methacrylic acid esters... for producing coatings
Implementation Method 2
one or more crosslinkable polyurethanes carrying ethylenically unsaturated groups
Data Source
AI summary
The invention relates to aqueous coating agents containing one or more copolymers of acrylic acid esters or methacrylic acid esters ((meth)acrylic acid esters), one or more cross-linkable polyurethanes and optionally one or more additives, wherein one or more of the copolymers of (meth)acrylic acid esters are based on a) one or more ethylenically unsaturated monomers, the homopolymer thereof having a glass transition temperature Tg of ≤ 10°C, and b) one or more ethylenically unsaturated monomers, the homopolymer thereof having a glass transition temperature Tg of ≥ 30°C, preferably ≥ 50°C, particularly preferably ≥ 80°C.