Polyacid-Amine Aqueous Fluids for Solubility and Metal Protection
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Solution Overview
Problem
Existing metalworking fluids and cooling tower inhibitors face challenges with limited solubility of amines and amino alcohols, leading to surface corrosion, microbial growth, and operational inefficiencies, while facing regulatory pressures on antimicrobial use and environmental concerns.
Innovation Solution
An aqueous solution containing alkylated amines and polyacids, with a ratio of acid groups to amine groups of at least 1.8:1, enhances solubility and antimicrobial properties, inhibiting metal staining and extending operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher concentrations of amines or amino alcohols are used to neutralize acid-functional components and maintain pH, then the antimicrobial efficacy and corrosion protection improve, but the solubility limit is exceeded leading to precipitation and surface degradation
Solution Approach 1:
The patent changes the chemical parameters by introducing polyacids with multiple carboxylic acid groups per molecule. This alters the solubility characteristics of the amine-containing system, enabling higher amine concentrations to remain dissolved. The polyacid structure allows for greater molecular interaction and solvation, resolving the precipitation issue that normally limits amine concentration in water-based fluids.
Solution Approach 2:
The invention creates a composite chemical system combining amines, amino alcohols, and polyacids in a water-based fluid. This composite approach allows the components to work synergistically, where the polyacid acts as a solubility-enhancing agent that enables the amine and amino alcohol to maintain higher concentrations without precipitating, thus resolving the solubility-concentration trade-off.
2Reliability
If higher concentrations of amines or amino alcohols are used to maintain pH, then the corrosion protection improves, but the odor becomes more objectionable
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating polyacids, which alter the pH buffer system and allow for different amine concentration regimes. This parameter change enables achieving the same corrosion protection with a different chemical balance that produces less objectionable odors, or allows the use of amine variants with better odor profiles at the required concentrations.
3Reliability
If conventional antimicrobial ingredients are used to suppress microbial growth, then the fluid stability improves, but regulatory pressures reduce available options and increase environmental impact
Solution Approach 1:
The patent introduces amino alcohols as intermediary substances that indirectly suppress microbial growth. Rather than using conventional direct antimicrobials, the amino alcohols modify the fluid environment to be less favorable for microbial growth and enhance the effectiveness of any antimicrobial agents present. This intermediary approach provides regulatory compliance while maintaining fluid stability.
Solution Approach 2:
The invention enables the fluid system to self-regulate microbial growth through the combined action of amines, amino alcohols, and polyacids. The amino alcohols increase cell membrane permeability, creating a self-enhancing effect where the fluid composition itself contributes to microbial suppression without relying heavily on external antimicrobial additives, thus reducing regulatory concerns.
4Object-affected harmful factors
If water-based fluids are used to cool and lubricate metalworking processes, then the environmental friendliness improves, but the microbial growth and odor development increase
Solution Approach 1:
The patent uses amino alcohols as intermediary agents that bridge the gap between environmental friendliness and microbial resistance. These compounds modify the water-based fluid to create an environment that is inherently less susceptible to microbial growth while maintaining the ecological benefits of water-based formulations. The amino alcohols act as a bridge, providing both solubility enhancement and microbial growth suppression.
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 provides enhanced solubility, antimicrobial efficacy, and corrosion protection, reducing operational costs and environmental impact by extending the working life of metalworking and cooling tower fluids.
Implementation Method 1
Some alkylated amines are soluble beyond aqueous solubility limits through the inclusion of the polyacids
Implementation Method 2
Some amino alcohols have been hypothesized to increase permeability of a bacterial cell membrane so as to render any antimicrobials present more effective
Data Source
AI summary
An aqueous solution is provided that includes an alkylated amine having an amine group and present from 6 to 40 total weight percent. A polyacid having carboxylic groups of a C5-C14 dicarboxylic acid, a polymeric acid having a plurality of acid groups, or a combination thereof is also present in the solution so as to result in a ratio of acid groups to amine group equivalents of at least 1.8:1. An aqueous solution is also provided in which the alkylated amine is 3-amino-4-octanol. The solutions provided have extended operating lifetimes relative to microbial growth, reduce staining of contacting metal substrates, or both. Some alkylated amines are soluble beyond aqueous solubility limits through the inclusion of the polyacids. A method of metalworking includes exposing a metal substrate to the aqueous solution. Followed by removing or displacing a portion of the metal substrate.