Quaternary Amine Rust Preventative Coating Water Separation
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Solution Overview
Problem
Rust preventative compositions based on natural waxes suffer from poor water separation properties, which is a critical issue in metal-working and hydraulic fluids, as they fail to effectively separate water, leading to dilution and compromised performance.
Innovation Solution
Incorporating quaternary ammonium salts as demulsifying additives into rust preventative compositions, specifically designed to improve water separation times without compromising corrosion protection, by using a quaternizeable compound reacted with a hydrocarbyl-substituted acylating agent and a quaternizing agent, resulting in a coating composition that includes a rust preventative, quaternary ammonium salt, and a lubricating oil or volatile diluent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural wax-based rust preventatives are used, then corrosion protection is improved, but water separation ability deteriorates
Solution Approach 1:
The patent combines natural wax-based rust preventative with quaternary ammonium salt additives to create a composite formulation. The quaternary ammonium salt serves as a demulsifying agent that enhances water separation while the natural wax maintains corrosion protection, resolving the contradiction between these two properties.
Solution Approach 2:
The patent modifies the chemical composition parameters of the rust preventative by introducing quaternary ammonium salts with specific molecular structures (containing nitrogen atoms with four substituents). This parameter change enables the formulation to achieve both good corrosion protection and improved water separation ability below 15 minutes.
2Reliability
If Group I refinery slack waxes are used, then rust prevention is achieved, but water separation performance deteriorates
Solution Approach 1:
The patent creates a composite system combining Group I slack wax base stock with quaternary ammonium salt demulsifiers. This composite approach allows the slack wax to provide rust prevention while the quaternary ammonium salt component addresses the water separation deficiency, achieving both functions simultaneously.
3Productivity
If demulsifying additives are added to improve water separation, then water separation time is reduced, but corrosion protection may be compromised
Solution Approach 1:
The patent applies local quality by using specific quaternary ammonium salt structures with particular molecular weights and functional groups that are optimized for demulsifying activity. These localized chemical properties enable water separation improvement without affecting the overall corrosion protection provided by the rust preventative components.
Solution Approach 2:
The patent carefully controls the concentration parameters of quaternary ammonium salt additives and selects compounds with specific molecular characteristics. By optimizing these parameters, the formulation achieves rapid water separation (below 15 minutes) while maintaining effective corrosion protection as verified by salt spray tests.
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 use of quaternary ammonium salts significantly improves water separation times in rust preventative compositions to below 15 minutes, maintaining effective corrosion protection as measured by ASTM B117 salt spray tests, even at low concentrations.
Implementation Method 1
quaternary ammonium salts as demulsifying agents
Implementation Method 2
corrosion protection as measured by ASTM B117 salt spray
Data Source
AI summary
The disclosed technology relates to corrosion or rust preventive coating compositions and methods of their use. The compositions comprise a rust preventative composition, optionally including a diluent, and a quaternary ammonium salt.