Water-Based MWF Composition with Aminopropanediol for Microbial Control
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Solution Overview
Problem
Existing metal working fluids (MWFs) suffer from microbial growth that degrades performance over time, leading to issues such as souring, viscosity changes, shortened shelf life, and accelerated corrosion, and current biocides pose health and regulatory concerns.
Innovation Solution
Incorporation of aminopropanediols as microbial growth control agents in semi-synthetic metal working fluids, combined with base oils, organic acids, emulsifiers, and water, to maintain pH and inhibit microbial growth effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional biocides are added to control microbial growth, then microbial growth is inhibited, but formaldehyde is released which is hazardous to human health
Solution Approach 1:
The patent extracts and removes the harmful formaldehyde-release mechanism from the biocide system by using alternative active ingredients (isothiazolinones, isoxazolinones, and their derivatives) that provide microbial growth control without formaldehyde formation, thereby eliminating the health hazard while maintaining reliability
Solution Approach 2:
The patent introduces pH buffers and chelating agents as intermediary substances that create an environment unfavorable to microbial growth without requiring formaldehyde-releasing biocides, thus mediating between the need for microbial control and the avoidance of harmful formaldehyde release
2Reliability
If microbial growth control agents are added to MWFs, then microbial growth is inhibited, but the fluid cost increases
Solution Approach 1:
The patent employs multi-functional additives that simultaneously provide microbial growth control, pH buffering, and corrosion inhibition properties, thereby achieving reliable microbial control without proportionally increasing fluid cost through multiple separate additives
Solution Approach 2:
The patent optimizes the concentration and selection of biocide components within specific ranges to achieve effective microbial growth control at economically viable levels, balancing reliability with cost considerations through parameter optimization
3Productivity
If MWFs are used over extended periods, then productivity is maintained, but microbial degradation causes performance deterioration
Solution Approach 1:
The patent incorporates preliminary protective measures through robust biocide systems and pH buffering that prevent microbial degradation before it can occur, enabling extended continuous operation while maintaining fluid performance stability through proactive protection
Solution Approach 2:
The patent ensures continuous effectiveness of microbial growth control through sustained-release mechanisms and stable biocide systems that maintain protective action over extended periods, allowing continuous productivity without performance deterioration
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 aminopropanediols provide long-term performance stability, improved cooling and lubricity, and extended shelf life while avoiding environmental and health hazards associated with traditional biocides.
Implementation Method 1
a method of controlling microbial growth in metal working fluids, wherein the method includes the addition of at least one such aminopropanediol to the metal working fluid
Implementation Method 2
The amine composition is usually used to maintain alkaline pH and neutralize acid functional components in the MWFs
Data Source
AI summary
The present invention describes a water-based metal working fluid comprising a base oil, an organic acid, optionally emulsifiers, a concentrate additive, water and a microbial growth control agent which comprises an aminopropanediol.