Single-Phase Paint Remover Composition Using THF and Coupling Co-Solvents
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Solution Overview
Problem
Current paint remover compositions, particularly those containing methylene chloride and NMP, face regulatory challenges and environmental concerns, necessitating the development of alternative compositions that are more environmentally friendly and compliant with EPA and California regulations.
Innovation Solution
A single-phase paint remover composition is developed, comprising tetrahydrofuran (THF) as a primary solvent, a low vapor pressure (LVP) coupling co-solvent such as 1,2-hexanediol or 1,2-pentanediol, an amine with a molar volume of less than 100 cm3/mol, and water at a concentration of greater than 18 wt%, which maintains miscibility and improves paint removal times while ensuring shelf-life stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If methylene chloride is used as the primary solvent in paint removers, then paint removal effectiveness is improved, but environmental safety and regulatory compliance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by replacing methylene chloride with tetrahydrofuran as the primary solvent and incorporating water (greater than 18 wt%) and low vapor pressure coupling co-solvents. This parameter substitution maintains paint removal effectiveness while eliminating the environmental harm associated with methylene chloride, achieving compliance with EPA and California regulations
Solution Approach 2:
The patent creates a composite solvent system combining tetrahydrofuran, water, low vapor pressure coupling co-solvents, and amines. This composite formulation achieves the desired paint removal performance while incorporating environmentally friendly components, thereby resolving the contradiction between effectiveness and environmental safety
2Productivity
If NMP is used in paint remover compositions, then paint removal performance is maintained, but regulatory compliance and environmental acceptance deteriorate
Solution Approach 1:
The patent eliminates NMP from the formulation and replaces it with an alternative solvent system comprising tetrahydrofuran, water, and low vapor pressure coupling co-solvents. This parameter change maintains paint removal performance while achieving compliance with EPA and California regulations that restrict NMP use
Solution Approach 2:
The patent extracts and removes NMP from the paint remover composition, eliminating the source of regulatory non-compliance and environmental harm while retaining the necessary paint removal functionality through the alternative solvent system
3Object-affected harmful factors
If water concentration is increased in the paint remover composition, then environmental friendliness is improved, but phase stability deteriorates
Solution Approach 1:
The patent introduces low vapor pressure coupling co-solvents as intermediary substances that bridge the incompatible phases of water and organic solvents. These coupling co-solvents maintain miscibility and phase stability even at greater than 18 wt% water concentration, enabling the formulation to be both environmentally friendly and compositionally stable
Solution Approach 2:
The patent creates a stable composite formulation by combining water, tetrahydrofuran, low vapor pressure coupling co-solvents, and amines in specific proportions. This composite structure maintains phase stability despite high water content, resolving the contradiction between environmental friendliness and composition stability
4Object-affected harmful factors
If organic solvent levels are decreased in the composition, then environmental safety is improved, but paint removal effectiveness deteriorates
Solution Approach 1:
The patent changes the solvent composition parameters by using tetrahydrofuran as the primary organic solvent and incorporating water and low vapor pressure coupling co-solvents. This parameter optimization maintains adequate organic solvent levels for effective paint removal while minimizing environmental harm and achieving regulatory compliance
Solution Approach 2:
The patent develops a composite solvent system that synergistically combines tetrahydrofuran, water, low vapor pressure coupling co-solvents, and amines. This composite formulation achieves effective paint removal with reduced overall organic solvent content, balancing environmental safety with productivity
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 achieves improved paint removal times and stability, with no observable phase separation after 28 days at 50°C, thereby addressing regulatory concerns and providing a more environmentally friendly paint removal solution.
Implementation Method 1
the methylene chloride molecule can quickly penetrate multiple layers and soften or dissolve chemical resistant coatings
Implementation Method 2
a low vapor pressure (LVP) coupling co-solvent present at an effective amount to maintain miscibility of the single-phase paint remover composition
Implementation Method 3
desired shelf-life stability (i.e., no observable phase separation after predetermined period(s) at predetermined temperature(s))
Data Source
AI summary
A paint remover composition including (a) tetrahydrofuran (THF) at a sufficient concentration to remove paint; (b) a low vapor pressure (LVP) coupling co-solvent present at an effective amount to maintain miscibility of the single-phase paint remover composition and to remove paint; (c) an amine with a molar volume of <100 cm3/mol; and (d) water at a concentration of greater than 18 wt % of an overall concentration of the single-phase paint remover composition and the methods of making and using the same.