Liquid Rheology Control Composition for Clear Coatings
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Solution Overview
Problem
Current rheology control agents for liquid coating systems, such as organically modified bentonites and urea compounds, often result in clouding, haze, and crystallite formation, leading to defects in clear coatings and require separate metering due to incompatibility, posing challenges in handling and application.
Innovation Solution
A composition comprising 15-95 wt % of an amide compound, 5-75 wt % of a urea compound, 0-50 wt % of an ionogenic compound, and 0-35 wt % of an organic solvent, specifically formulated to provide enhanced rheological activity and compatibility, reducing the need for separate metering and improving handling and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry solid rheological aids are used, then rheology control is achieved, but clouding and haze occur in clear coatings
Solution Approach 1:
The patent changes the physical state parameter of rheological aids from solid to liquid form. Specifically, it uses liquid amide compounds (molar mass 70-600 g/mol) and liquid urea compounds (molar mass at least 350 g/mol) instead of dry solids, thereby eliminating clouding and haze while maintaining rheology control functionality
Solution Approach 2:
The patent creates a composite liquid composition combining multiple rheologically active compounds (amide compounds and urea compounds) with complementary properties. This composite approach allows synergistic rheology control while maintaining clarity, as each component contributes different rheological characteristics that together provide superior performance
2Reliability
If multiple incompatible rheological aids are used, then rheology control is improved, but separate metering is required
Solution Approach 1:
The patent merges multiple incompatible rheological aids (amide compounds and urea compounds) into a single compatible liquid composition. The specific formulation ensures mutual compatibility between components, allowing them to be added as one mixture rather than requiring separate metering operations
Solution Approach 2:
The liquid composition serves multiple functions simultaneously: it provides rheology control, maintains compatibility with various coating formulations, eliminates clouding, and simplifies application procedure. This multi-functional liquid additive replaces what would traditionally require multiple separate solid additives
3Reliability
If dry pulverulent products are handled, then rheology control is achieved, but dust is generated during processing
Solution Approach 1:
The patent changes the physical state parameter from solid powder to liquid form. The rheological activity is maintained through the molecular structure and properties of liquid amide and urea compounds, eliminating dust generation while preserving the desired rheology control effect
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 exhibits improved rheological activity, broad compatibility, and storage stability, allowing for easier handling and application as a single additive, reducing the risk of defects and improving the quality of clear coatings.
Implementation Method 1
the amide compound (A) contains not more than one amide group with hydrogen bonded to its nitrogen atom
Data Source
AI summary
The invention relates to a rheology control agent containing i) 15-95% by weight of an amide compound (A), ii) 5-75% by weight of a urea compound (B), iii) 0-50% by weight of an ionogenic compound (C) and iv) 0-35% weight of an organic solvent (D).