Rinse Aid Compositions with Improved Biodegradability
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Solution Overview
Problem
Existing rinse aid compositions for automatic car washes have poor biodegradability, form unstable emulsions, and can create viscous gels upon dilution, leading to operational issues and inefficient drying of hard surfaces.
Innovation Solution
Development of rinse aid compositions comprising a diethanolamine-based ester quaternary emulsifier with a high diester quaternary content and a biodegradable hydrophobe, forming stable microemulsions that do not gel upon dilution, providing a durable hydrophobic coating for efficient water removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rinse aid compositions are used, then drying of hard surfaces is achieved, but poor biodegradability and environmental harm occur
Solution Approach 1:
The patent changes the chemical parameters of the emulsifier by using diethanolamine-based ester quaternary compounds with specific molecular structures (formulae A and B) that balance effective surface activity with improved biodegradability, resolving the contradiction between drying performance and environmental harm
Solution Approach 2:
The invention uses composite emulsifier systems combining diester quaternary compounds with monoester quaternary compounds in specific ratios, creating a synergistic formulation that maintains effective rinse aid performance while improving biodegradability compared to conventional single-component systems
2Reliability
If conventional emulsion formulations are used, then rinse aid function is achieved, but viscous gel phase forms upon dilution causing operational issues
Solution Approach 1:
The patent modifies the emulsion parameters by using diethanolamine-based ester quaternary emulsifiers with specific HLB values and molecular structures that prevent gel phase formation upon dilution, maintaining fluid stability across the full concentration range from concentrated form to diluted application
Solution Approach 2:
The invention uses coemulsifiers as intermediary substances that work synergistically with the primary diethanolamine-based ester quaternary emulsifier to stabilize the emulsion structure during dilution, preventing the formation of viscous gel phases and ensuring smooth flow through spray nozzles
3Reliability
If conventional cationic surfactants and hydrophobes are used, then water film removal is achieved, but unpleasant smell and flammability occur
Solution Approach 1:
The patent changes the physical and chemical parameters of the hydrophobe component by selecting substances with higher boiling points and lower volatility, thereby reducing unpleasant smells and flammability while maintaining the water film removal function through optimized hydrophobe-to-emulsifier ratios
Solution Approach 2:
The invention uses biodegradable hydrophobe substances that break down quickly in the environment, replacing conventional long-lasting but harmful hydrophobes, thereby reducing unpleasant smells and flammability risks while maintaining effective water film removal during the rinse aid's functional lifetime
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 compositions exhibit improved biodegradability, stability, and drying kinetics, promoting shorter drying times with a durable hydrophobic coating on hard surfaces, suitable for automated car washes without clogging issues or environmental harm.
Implementation Method 1
The present invention relates to compositions, preferably microemulsions, that contain esterified dialkyldiethanolammonium quaternary compounds, hydrophobes and optionally water
Implementation Method 2
The compositions contain a hydrophobing agent that sticks to hard surfaces and uniformly plates out the emulsified hydrophobe to create a shiny, hydrophobic coating
Implementation Method 3
Because of the adsorption of the cationic surfactant and the hydrophobe on the paint surface, the water film is opened up, and the drops of water can then easily be removed by means of a blower
Data Source
AI summary
The present invention is directed to rinse aid compositions with improved biodegradability that may be used in automated carwash operations to promote drying and improve the appearance of vehicles.