Metalworking Fluid Additive Composition for Corrosion Inhibition
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Solution Overview
Problem
Metalworking fluids, particularly those in oil-in-water emulsions, face issues with microbial growth due to components like phosphorus and sulfur, leading to corrosion and degradation, and existing corrosion inhibitors like amine borates have environmental and health concerns, necessitating alternative compounds that inhibit microbial growth without being biocides.
Innovation Solution
An industrial fluid additive composition comprising one or more sequestering agents and compounds of formula (A), which synergistically inhibit microbial growth by increasing pH and chelating metal ions, reducing the need for biocides like secondary amines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amine borates are used as corrosion inhibitors, then corrosion inhibition and biocidal activity are improved, but environmental impact and health hazards worsen
Solution Approach 1:
The patent extracts and eliminates amine borates from the formulation, replacing them with alternative corrosion inhibitors that do not have the same environmental and health hazards. This involves removing the harmful substance while maintaining the protective function through alternative compounds.
Solution Approach 2:
The patent changes the chemical composition parameters by substituting amine borates with other corrosion inhibitors, altering the chemical properties to achieve the same protective effect without the harmful side effects. This involves modifying the chemical identity while maintaining functional performance.
2Reliability
If secondary amines like cyclohexylamine are used as corrosion inhibitors, then corrosion inhibition is improved, but toxicity worsens due to nitrosamine formation
Solution Approach 1:
The patent removes secondary amines from the formulation due to their toxicity issues. By eliminating these compounds, the invention avoids the formation of toxic nitrosamines while still achieving corrosion protection through alternative, safer inhibitors.
Solution Approach 2:
The patent replaces toxic secondary amines with alternative corrosion inhibitors that may have shorter operational lifetimes or different chemical structures, avoiding the long-term toxicity associated with nitrosamine formation from secondary amines.
3Reliability
If biocides are added to inhibit microbial growth, then microbial growth is reduced, but toxicity and environmental impact increase
Solution Approach 1:
The patent converts the harmful effect of pH increase (which can be caustic) into a beneficial effect by using it as the primary mechanism for microbial growth inhibition. The high pH creates an inhospitable environment for microorganisms without requiring toxic biocides, thus transforming a potentially harmful property into a useful protective mechanism.
Solution Approach 2:
The patent changes the approach from using toxic biocides to using pH modification as the control mechanism. By altering the pH parameter to high levels, the invention creates conditions that naturally inhibit microbial growth without introducing toxic substances, thus achieving the same protective effect through a different parameter.
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 additive composition effectively inhibits bacterial and fungal growth in metalworking fluids, creating an inhospitable environment for microorganisms without directly killing them, thus reducing microbial populations and corrosion, while avoiding the toxicity and environmental impact of biocides.
Implementation Method 1
The pH of metalworking fluids based on oil-in-water emulsions is typically from 8.5 to 9.5. Where microorganisms are present in the metalworking fluid, decomposition of various components of the metalworking fluid can increase the carbon dioxide content of the fluid, which decreases its pH.
Implementation Method 2
Various methods of inhibiting corrosion in metalworking fluids are known in the art. Most of these include adding a pH increasing additive to the metalworking fluid which increase the pH to an alkaline pH such that corrosion is reduced relative to when the metalworking fluid has a more acidic pH.
Data Source
AI summary
An industrial fluid additive composition comprises one or more sequestering agents one or more compounds of formula (A): (A) wherein R1 and R2 are independently selected from substituted hydrocarbyl moieties containing from 1 to 10 carbon atoms or unsubstituted hydrocarbyl moieties containing from 1 to 10 carbon atoms.