Aqueous Refinish Mixer System Reduces Flash-Off Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aqueous refinish compositions for automotive refinishing face challenges with flash-off and drying times, film defects, adhesion issues, and blistering/swelling, particularly in achieving a finish comparable to OEM production-line finishes while maintaining storage stability and economic viability.
Innovation Solution
A mixer system comprising a pigment-free base varnish, a tinting base with physically curing polyurethane and optical-effect pigments, and a rheology module with an aqueous dispersion of seed-core-shell polymer and aliphatic monoalcohols, optimized through successive radical emulsion polymerization for improved film formation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous coating materials are used to replace solventborne coating materials, then environmental compliance is improved, but flash-off and drying times increase
Solution Approach 1:
The patent changes the chemical composition parameters of the aqueous coating material by incorporating specific polymers prepared by multistage emulsion polymerization and controlling the content of high-boiling-point alcohols (5-20% by weight), thereby modifying the evaporation rate and drying characteristics to reduce flash-off and drying times while maintaining environmental compliance
Solution Approach 2:
The patent creates a composite aqueous coating system combining multiple components: polymers from multistage emulsion polymerization, high-boiling-point alcohols (C5-C6), and conventional coating additives, which work synergistically to achieve both environmental compliance and reduced drying times
2Object-affected harmful factors
If aqueous coating materials are used, then environmental compliance is improved, but coating quality deteriorates with wetting defects and poor hiding power
Solution Approach 1:
The patent modifies the surface tension and wetting properties of the aqueous coating material by incorporating specific polymers and high-boiling-point alcohols, improving wetting behavior and eliminating wetting defects while maintaining environmental compliance
Solution Approach 2:
The patent develops a composite aqueous system where polymers from multistage emulsion polymerization work synergistically with high-boiling-point alcohols to achieve proper wetting, adhesion, and hiding power, thereby improving overall coating quality
3Productivity
If flash-off and drying times are reduced, then productivity is improved, but coating quality deteriorates with increased clouding and poorer flop effect
Solution Approach 1:
The patent carefully controls the concentration of high-boiling-point alcohols (5-20% by weight) and the molecular structure of polymers to optimize the balance between drying speed and coating quality, preventing clouding while maintaining flop effect through controlled evaporation rates
Solution Approach 2:
The patent creates a composite system where the interaction between polymers and high-boiling-point alcohols provides controlled evaporation that reduces drying time while preventing clouding and maintaining pigment orientation for proper flop effect
4Ease of manufacture
If mixer system components are developed for economic production, then production cost is reduced, but storage stability deteriorates
Solution Approach 1:
The patent divides the coating system into separate mixer components (base coating material, color concentrates, additives) that can be stored independently with improved stability, then combined economically at the point of use, reducing both storage stability issues and production costs
Solution Approach 2:
The patent develops stable composite formulations for each mixer component using polymers from multistage emulsion polymerization and controlled alcohol content, ensuring long-term storage stability while maintaining economic viability through efficient production
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 mixer system significantly reduces flash-off and drying times, ensures a cloud-free surface with good metallic flop, maintains adhesion to the original finish, and prevents blistering and swelling, while ensuring storage stability and economic production.
Implementation Method 1
an aqueous dispersion comprising at least one polymer SCS, wherein the aqueous dispersion is prepared by the successive radical emulsion polymerization of three mutually different monomer mixtures (A), (B) and (C) of olefinically unsaturated monomers
Data Source
AI summary
Provided herein is a mixer system for producing refinish compositions, more particularly for the sector of automotive finishing, including at least mutually different components (1), (2), and (3), namely component (1) as base varnish, component (2) as tinting base, and component (3) as rheology module, with at least one of components (1) to (3) including at least one aqueous dispersion including at least one polymer prepared by multistage emulsion polymerization, and at least one of components (1) to (3) including at least one aliphatic monoalcohol having 5 carbon atoms and/or at least one aliphatic monoalcohol having 6 carbon atoms. Further provided herein is an aqueous refinish composition that is produced by the mixing of components (1) to (3), and a method for producing aqueous refinish compositions. Further provided herein is a use of the mixer system for producing aqueous refinish compositions for automotive refinishing.