Synergistic Mixed Solvents for Paint Removal Efficiency
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Solution Overview
Problem
Existing paint and varnish removal compositions face issues with high inhalation toxicity, flammability, and environmental regulation concerns due to high volatile solvent content, and they often require multiple applications and larger quantities, with limited effectiveness on thick paint accumulations and non-toxicity issues with current alternatives.
Innovation Solution
A composition comprising environmentally acceptable polar solvents with Hansen's fractional polar solubility parameter greater than 0.16, combined with an activator, which enhances the efficiency of paint and varnish removal by at least 10% compared to theoretical calculations, using solvents like Pentanoic acid, DMSO, and DMI, and incorporating wetting and spreading agents for improved wetting and spreading capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high volatile solvent content is used for effective paint removal, then paint removal efficiency is improved, but inhalation toxicity and flammability increase
Solution Approach 1:
The patent changes the chemical composition parameters by using low volatile solvents (boiling point >90°C) such as NMP, BLO, and their mixtures, replacing traditional high volatile solvents. This parameter change maintains paint removal effectiveness while reducing inhalation toxicity and flammability hazards.
Solution Approach 2:
The patent employs composite solvent systems combining multiple low volatile solvents (NMP, BLO, and their mixtures) to achieve synergistic effects. This composite approach provides effective paint removal performance while maintaining low toxicity and flammability characteristics that individual solvents may not achieve alone.
2Productivity
If high volatile solvent content is used for effective paint removal, then paint removal efficiency is improved, but environmental regulation concerns increase
Solution Approach 1:
The patent changes the volatility parameter of the solvent system by selecting solvents with boiling points above 90°C, thereby reducing vapor emissions and environmental contamination while maintaining effective paint removal performance.
Solution Approach 2:
The patent converts the traditionally harmful high volatility characteristic into a benefit by using low volatile solvents that reduce environmental contamination and regulatory concerns, while still achieving effective paint removal through optimized solvent combinations and activators.
3Quantity of substance
If larger amounts of paint stripping composition are used to handle thick paint accumulations, then complete paint removal is achieved, but the need for multiple applications increases
Solution Approach 1:
The patent applies activators to the paint surface before or during the stripping process to pre-soften and prepare the paint coating. This preliminary action enables the low volatile solvent system to penetrate and remove thick paint accumulations more effectively in fewer applications, reducing total treatment time.
Solution Approach 2:
The patent optimizes the chemical parameters of the solvent system (using specific ratios of NMP, BLO, and activators) to enhance penetration capability and paint softening effectiveness, allowing complete removal of thick paint layers in fewer applications without requiring excessive quantities of the composition.
4Object-affected harmful factors
If low volatile solvents are used to reduce toxicity, then inhalation safety is improved, but solvent power and paint removal speed may decrease
Solution Approach 1:
The patent uses composite solvent systems combining NMP, BLO, and their mixtures to achieve synergistic solvent power. This composite approach compensates for the lower volatility of individual solvents by providing enhanced collective solvent capability, maintaining fast paint removal speeds while ensuring inhalation safety.
Solution Approach 2:
The patent employs activators as intermediary substances that enhance the solvent power and penetration ability of the low volatile solvent system. These activators mediate between the safety requirements of low volatility and the performance requirements of fast paint removal, enabling both goals to be achieved 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 composition effectively removes paint and varnish coatings from wood and metal surfaces with reduced volatile solvent use, offering enhanced performance, lower toxicity, and easier post-stripping washability, while minimizing environmental impact and flammability concerns.
Implementation Method 1
A composition comprising a mixture of a first environmentally acceptable polar solvent having a Hansen's fractional polar solubility parameter component of greater than about 0.16 or 16%, a second environmentally acceptable polar solvent having a Hansen's fractional solubility parameter component greater than 0.25 or 25% and an activator
Implementation Method 2
incorporating wetting and spreading agents for improved wetting and spreading capabilities
Data Source
AI summary
A composition which is particularly effective for removing paint or varnish from wood concrete or metal surfaces comprising synergistic mixed solvents-based compositions with Improved efficiency of performance and environmental safety. The mixed solvent compositions are made from about 10-90% by weight of each polar solvent selected from the group consisting of (pentanoic acid, 5-(dimethylamino)-4-methyl-5-oxo-methyl ester; propylene carbonate, N,N-dimethyl imidazolidinone, dimethyl sulfoxide, dimethyl acetamide, gamma butyrolactone, benzyl alcohol, and mixtures thereof and an activator, ethyl ethoxy propionate, and an aqueous system additive. Methods for use of the composition are also disclosed.