Waterborne Paint Circuit Purging With 7–15-Carbon Amines
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Solution Overview
Problem
Existing purge cleaners for paint circuits have low cleaning efficiency and high VOC and COD in wastewater, necessitating improved cleaning methods with reduced organic solvent content.
Innovation Solution
A waterborne purge cleaner solution comprising at least one glycolether and a water-soluble amine with 7-15 carbon atoms, which does not require surfactants or chelating agents, and eliminates the need for a post-rinse step, achieving improved cleaning efficiency and reduced VOC and COD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional waterborne purge cleaners containing glycolethers and short-chain amines (e.g., triethanolamine) are used, then the cleaning efficiency is limited, but the VOC content and COD in wastewater remain high
Solution Approach 1:
The patent changes the chemical parameter of the amine component by using long-chain water-soluble amines (7-15 carbon atoms) instead of conventional short-chain amines. This parameter change simultaneously improves cleaning efficiency through better paint solubility and reduces VOC emissions and COD in wastewater due to the higher molecular weight and lower volatility of the long-chain amines.
Solution Approach 2:
The patent creates a composite purge cleaner formulation combining glycolethers with long-chain water-soluble amines. This composite approach leverages the synergistic effect between the glycolether solvent system and the long-chain amine, achieving superior cleaning performance while maintaining low VOC and COD characteristics.
2Reliability
If purge cleaners with high organic solvent content are used to improve cleaning efficiency, then the cleaning performance increases, but the COD in wastewater increases
Solution Approach 1:
The patent changes the molecular weight parameter of the amine component by selecting amines with 7-15 carbon atoms. This parameter change allows achieving high cleaning efficiency with lower quantities of organic substance, thereby reducing COD in wastewater while maintaining effective paint removal capability.
3Reliability
If conventional purge cleaners require post-rinse steps to remove residual cleaner, then the cleaning process is more complete, but the processing time and water consumption increase
Solution Approach 1:
The patent enables the purge cleaner to self-rinse effectively by using long-chain water-soluble amines that maintain high water solubility. The cleaner automatically removes its own residues through the water flow in the circulation system without requiring additional post-rinse steps, saving time and water consumption while ensuring complete cleaning.
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 solution achieves enhanced cleaning efficiency and significantly lowers VOC and COD in wastewater, with a concentrate requiring less dilution than prior art, demonstrating improved performance over conventional amines like triethanolamine.
Implementation Method 1
a waterborne purge cleaner solution comprising at least one glycolether and which additionally comprises at least one water-soluble amine having at least 7 carbon atoms
Implementation Method 2
Water-soluble amine having at least 7 carbon atoms... improved cleaning efficiency
Data Source
AI summary
Described herein is a method for purging paint circuits coated with a non-cured paint with improved cleaning efficiency and a reduced COD (Chemical Oxygen Demand) in the wastewater, where a paint circuit is brought into contact with a waterborne purge cleaner solution including at least one glycolether and which additionally includes at least one water-soluble amine having at least 7 carbon atoms. Also described herein is a waterborne purge cleaner solution with improved cleaning efficiency and reduced VOC (Volatile Organic Compound) content as well as a concentrate for producing the purge cleaner solution.