Ternary Solvent Composition for Multilayer Coating Removal
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Solution Overview
Problem
Current paint stripping products without methylene chloride often have inferior performance and introduce other health and environmental hazards, requiring longer dwell times and multiple applications for removing multilayer coatings, while also posing risks to human health and safety.
Innovation Solution
A composition comprising 30 to 90 volume percent of solvents such as methyl acetate, dimethyl sulfoxide, and thiophene, which provides comparable solvency to methylene chloride-based compositions, is used for removing multilayer coatings, with a focus on low volatile organic compound content and safe handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If methylene chloride is used as a solvent in paint stripping compositions, then the paint stripping performance is high and coatings are removed effectively, but the composition introduces severe human health hazards and environmental risks
Solution Approach 1:
The patent changes the chemical composition parameters by replacing methylene chloride with a ternary solvent system comprising dimethyl sulfoxide (20-40 vol%), methyl acetate (30-50 vol%), and a cyclic carbonate (10-30 vol%). This parameter substitution maintains effective paint stripping performance while eliminating the severe health hazards associated with methylene chloride inhalation and carcinogenicity.
Solution Approach 2:
The patent employs a composite solvent system combining three different chemical components (dimethyl sulfoxide, methyl acetate, and cyclic carbonate) to achieve the paint stripping function. This composite approach leverages the synergistic effects of the components to match or exceed methylene chloride's effectiveness while avoiding its toxic properties.
2Object-affected harmful factors
If methylene chloride-free alternatives are used in paint stripping compositions, then human health hazards are reduced, but the paint stripping performance becomes significantly inferior and requires longer dwell times
Solution Approach 1:
The patent optimizes the concentration parameters of the solvent components to achieve rapid paint removal. The specific formulation ranges (dimethyl sulfoxide: 20-40 vol%, methyl acetate: 30-50 vol%, cyclic carbonate: 10-30 vol%) are designed to provide sufficient solvency power for quick coating penetration and removal, reducing dwell time compared to conventional methylene chloride-free products.
Solution Approach 2:
The composite solvent system combines the high solvency power of dimethyl sulfoxide with the effective penetration of methyl acetate and the coating-softening properties of cyclic carbonates. This synergistic combination achieves rapid multilayer coating removal without requiring extended dwell times, addressing the time loss issue of alternative solvents.
3Object-affected harmful factors
If replacement chemicals such as NMP are used to replace methylene chloride, then human health hazards are reduced, but other environmental and safety hazards are introduced
Solution Approach 1:
The patent substitutes NMP with a different chemical formulation consisting of dimethyl sulfoxide, methyl acetate, and cyclic carbonate. This parameter change eliminates NMP's environmental persistence and safety hazards while maintaining effective paint stripping performance. The selected solvents have favorable environmental profiles with lower bioaccumulation potential and reduced ecological toxicity.
Solution Approach 2:
The patent extracts and eliminates the problematic NMP component from the solvent system while retaining the essential paint stripping function through the alternative ternary solvent combination. This extraction approach removes the specific environmental and safety hazards associated with NMP while preserving the core functionality.
4Object-affected harmful factors
If paint stripping compositions are formulated without methylene chloride, then health hazards are reduced, but the compositions fail to penetrate multilayer coatings effectively and require multiple applications
Solution Approach 1:
The patent uses a composite solvent system where dimethyl sulfoxide provides deep penetration capability, methyl acetate facilitates coating softening and swelling, and cyclic carbonates enhance overall solvency. This multi-component composite approach enables effective penetration through multiple coating layers in a single application, overcoming the limitation of conventional methylene chloride-free products.
Solution Approach 2:
The patent adjusts the solvency parameters of the composition by selecting solvents with appropriate molecular sizes, polarities, and boiling points. The ternary system's combined solvency parameters enable effective penetration into and dissolution of multilayer coatings, achieving single-application removal capability that matches or exceeds methylene chloride-based formulations.
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 various coatings with a reasonable dwell time, minimizing substrate damage and achieving high substrate exposure, while being significantly less toxic and safer for human use compared to traditional methylene chloride-based products.
Implementation Method 1
A composition comprising, based on the total volume of the composition, 30 to 90 volume percent methyl acetate, dimethyl carbonate, acetone, or a combination thereof; 25 to 60 volume percent dimethyl sulfoxide, methyl glyoxal, propylene carbonate, gamma butyrolactone, ethylene carbonate, 2-chloro-1-propanol, or a combination thereof; and 0 to 35 volume percent thiophene, 1,3-dioxolane, thioacetic acid, or a combination thereof
Data Source
AI summary
A composition includes methyl acetate, dimethyl carbonate, acetone, or a combination thereof, dimethyl sulfoxide, methyl glyoxal, propylene carbonate, gamma butyrolactone, ethylene carbonate, 2-chloro-1-propanol, or a combination thereof, and optionally thiophene, 1,3-dioxolane, thioacetic acid, or a combination thereof. The respective amounts of each solvent are further described herein, and the total amounts of methyl acetate, dimethyl carbonate, acetone, dimethyl sulfoxide, methyl glyoxal, propylene carbonate, thiophene, 1,3-dioxolane, and thioacetic acid sum to at least 90 volume percent of the total volume of the composition. The composition can be particularly useful for removal of a coating from a surface. Accordingly, a method of removing a coating from a surface is also disclosed.