Cyclic Amide Rheology Additives for Clear, Stable Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rheology control auxiliaries in liquid systems, such as clays and organically modified silicas, often cause clouding and haze in transparent coatings, are technologically unfavorable due to dust formation and require precise temperature control, and their storage stability and compatibility with application systems are limited.
Innovation Solution
A composition comprising urea-based compounds with specific molecular weights and structures, combined with N-substituted caprolactam derivatives, provides improved rheological efficacy and stability, avoiding crystallization and ensuring broad compatibility with various application systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry solids like clays and organically modified silicas are used as rheology control auxiliaries, then rheological control is achieved, but processing complexity increases due to required temperature control and shear forces, and product quality deteriorates due to clouding and haze in transparent coatings
Solution Approach 1:
The invention changes the physical state parameter of the rheology control auxiliary from solid to liquid form. The liquid preparation comprises urea-based compounds with specific molecular weights (350-30,000 g/mol) dissolved in solvents, eliminating the need for temperature control and shear forces during processing while maintaining effective rheological control in the coating composition
Solution Approach 2:
The invention extracts the essential rheological control function from complex solid clay structures and implements it through simpler liquid urea-based compounds. The liquid form directly provides viscosity control without requiring the complex processing steps needed for solid auxiliaries, thereby reducing processing complexity while maintaining reliability
2Reliability
If dry solids are used as rheology control auxiliaries, then rheological control is achieved, but product quality deteriorates due to clouding and haze in transparent coatings
Solution Approach 1:
Changing from solid to liquid form prevents the optical scattering that causes clouding and haze. The liquid urea-based compounds remain dissolved or dispersed at the molecular level in the coating composition, maintaining transparency while providing the necessary rheological control
Solution Approach 2:
The invention uses readily soluble urea-based compounds that can be easily incorporated into the liquid coating system without requiring complex processing or specialized handling, thereby eliminating the harmful optical effects associated with solid particulate auxiliaries
3Ease of operation
If liquid rheology control auxiliaries are used, then ease of operation improves, but storage stability deteriorates due to crystallization and reduced efficacy during prolonged storage
Solution Approach 1:
The invention optimizes the molecular weight parameters of the urea-based compounds (350-30,000 g/mol) to balance solubility and stability. This parameter range ensures the compounds remain soluble during storage without crystallizing, while still providing effective rheological control when applied, thus maintaining both ease of operation and storage stability
Solution Approach 2:
The invention uses specific solvents as intermediaries to dissolve the urea-based compounds, creating stable liquid preparations that resist crystallization during storage. The solvent acts as a mediator that maintains the dissolved state of the urea compounds, preventing precipitation while allowing easy incorporation into coating compositions
4Ease of operation
If liquid rheology control auxiliaries are used, then ease of operation improves, but compatibility deteriorates due to limited compatibility with binders and other constituents
Solution Approach 1:
The invention designs urea-based compounds with universal compatibility across different binder types and coating formulations. The liquid preparation can be used with various resin systems and coating constituents without causing adverse reactions, making it universally applicable while maintaining ease of operation
Solution Approach 2:
By controlling the molecular weight and chemical structure parameters of the urea-based compounds, the invention achieves broad compatibility with different binders and coating constituents. The specific parameter ranges selected ensure minimal interaction and maximum compatibility across diverse formulation systems
Data Source
AI summary
The invention relates to a composition comprising one or more urea-based compounds (A) having a number average molecular weight (Mn) between 350 g/mol and 30000 g/mol and one or more N-substituted caprolactam derivatives (B) according to formula (I) wherein R1 is an organic group having 1 to 2 carbon atoms and wherein R1 contains no oxygen atoms linked by single bonds.