Hydrogenated Triglyceride Rust Preventive Coatings
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Solution Overview
Problem
Existing rust preventive coatings face challenges with poor solubility of triglyceride waxes in solvents, leading to precipitate formation and inadequate corrosion protection on metal surfaces.
Innovation Solution
A coating composition combining a higher melting triglyceride (38°C to 60°C) with a lower melting triglyceride (20°C to 30°C), a hydrocarbon-soluble ester-containing polymer, a carboxylic diacid or polyacid, a salt of an alkylarylsulfonic acid, and a hydrocarbon oil, ensuring good solubility and effective rust inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If triglyceride waxes are used in rust preventive coatings, then corrosion protection is improved, but solubility in solvents deteriorates leading to precipitate formation
Solution Approach 1:
The patent modifies the chemical structure of triglyceride waxes by controlling the degree of hydrogenation to adjust melting point and solubility parameters. By hydrogenating natural oils to specific iodine values (20-60), the patent achieves optimal balance between corrosion protection and solubility in hydrocarbon solvents, preventing precipitate formation while maintaining protective film integrity.
Solution Approach 2:
The patent creates composite coating formulations combining hydrogenated triglyceride waxes with hydrocarbon solvents and complementary additives. This composite approach allows the triglyceride wax to provide corrosion protection while the hydrocarbon solvent system maintains solubility and prevents precipitation, resolving the contradiction between protective performance and compositional stability.
2Strength
If higher melting point triglycerides are used, then film integrity is improved, but solubility and application properties deteriorate
Solution Approach 1:
The patent precisely controls the melting point parameter of triglyceride waxes through hydrogenation degree adjustment, targeting a specific range (38°C to 60°C) that optimizes both film integrity and solubility. This parameter optimization allows the coating to form intact protective films while remaining soluble enough for practical application without premature precipitation.
3Reliability
If natural oils are hydrogenated to improve rust inhibition, then corrosion protection is enhanced, but processing complexity increases
Solution Approach 1:
The patent uses commercially available natural oils as starting materials and applies straightforward hydrogenation processing to create effective rust inhibitors. This approach replaces complex synthetic wax synthesis with a simpler process using readily available feedstocks, reducing overall processing complexity while maintaining or improving corrosion protection performance.
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 composition provides excellent solubility and corrosion protection to metal surfaces, preventing rust and ensuring film integrity with minimal premature failures.
Implementation Method 1
a salt of an alkylarylsulfonic acid, wherein the alkyl group thereof is of sufficient length to provide solubility of the salt in a hydrocarbon oil; and (f) a hydrocarbon oil in an amount sufficient to dissolve said salt
Implementation Method 2
The compositions provide excellent solubility and corrosion protection to metal surfaces, preventing rust and ensuring film integrity
Data Source
AI summary
A coating composition of a first triglyceride having a melting point of at least 35°C; a second triglyceride having a melting point of less than 35°C; a hydrocarbon-soluble ester-containing polymer; a carboxylic diacid or polyacid having at least 10 carbon atoms; and a metal salt of an alkylarylsulfonate in a hydrocarbon oil, provides good rust protection.