Antifreeze Composition Thermal Stability Hard Water Scale
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Solution Overview
Problem
Existing antifreeze compositions face challenges with thermal stability at low temperatures and unwanted deposit formation, which can lead to reduced heat transfer efficiency and physical damage in cooling systems, especially when using hard water and certain corrosion inhibitors.
Innovation Solution
An antifreeze composition comprising 1 to 3 wt.% of 3,5,5-trimethylhexanoic acid and 1 to 3 wt.% of p-tertbutylbenzoic acid in a matrix of 50-60 wt.% mono ethylene glycol, combined with additional corrosion inhibitors and optional additives, to maintain clarity and minimize deposit formation at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicate/phosphate corrosion inhibitors are used to protect metal cooling system parts, then corrosion protection is improved, but deposit formation increases leading to reduced heat transfer efficiency
Solution Approach 1:
The patent removes silicate and phosphate corrosion inhibitors from the antifreeze composition, replacing them with alternative corrosion protection mechanisms that do not produce insoluble deposits. This extraction of problematic substances eliminates the root cause of deposit formation while maintaining corrosion protection through different chemical approaches.
Solution Approach 2:
The patent changes the chemical composition parameters by eliminating silicate/phosphate inhibitors and introducing a deposit prevention package with specific organic acids and corrosion inhibitors. This parameter change transforms the chemical behavior of the composition, preventing the precipitation reactions that occur when silicates/phosphates interact with hard water.
2Ease of operation
If antifreeze composition is diluted with hard water, then desired concentration is achieved, but scale formation occurs from alkaline earth metal carbonate and phosphate deposition
Solution Approach 1:
The patent extracts phosphate-based corrosion inhibitors from the composition, eliminating the chemical basis for scale formation with hard water. Without phosphate inhibitors, the precipitation reaction with alkaline earth metals cannot occur, allowing safe dilution with hard water.
Solution Approach 2:
The patent introduces organic acids and deposit prevention agents as intermediary substances that mediate between the antifreeze composition and hard water. These intermediaries prevent the direct reaction between water minerals and corrosion inhibitors, blocking scale formation while allowing dilution.
3Object-generated harmful factors
If silicate stabilizers are added to prevent silicate deposit, then deposit formation is reduced, but additive solubility decreases at sub-freezing temperatures
Solution Approach 1:
The patent removes silicate stabilizers from the composition, eliminating the low-temperature solubility problem associated with these additives. By extracting the problematic stabilizers, the composition maintains clarity and homogeneity at sub-freezing temperatures without requiring additional solubility-enhancing agents.
4Reliability
If precipitates form in cooling system, then corrosion inhibition is enhanced, but cooling system flow is reduced and service life is shortened
Solution Approach 1:
The patent converts the potential harm of corrosion into a benefit by using organic acid-based corrosion inhibitors that provide protection without forming precipitates. The harmful precipitation reaction is replaced with a beneficial soluble corrosion protection mechanism that maintains system flow while protecting metals.
Solution Approach 2:
The patent changes the corrosion inhibition mechanism from precipitate-forming silicates/phosphates to soluble organic acid-based inhibitors. This parameter change in the chemical composition eliminates the trade-off between corrosion protection and system flow, allowing both to be optimized simultaneously.
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 exhibits excellent thermal stability with minimal precipitate formation, maintaining clarity and effectiveness at sub-freezing temperatures, thus enhancing the service life and heat transfer efficiency of cooling systems.
Implementation Method 1
The invention relates generally to antifreeze compositions exhibiting improved thermal stability at low temperatures
Implementation Method 2
a matrix of 50-60 wt. % (based on the final weight of the diluted composition) of mono ethylene glycol
Implementation Method 3
the composition further comprises from 0.05 to 5 wt. % of at least one corrosion inhibitor
Data Source
AI summary
An antifreeze composition having Improved {hernia! stability is provided In one embodiment, the antifreeze concentrate composition comprises from 50 to 99 wt. % of a gjycoi-based freezing point, depressant selected from the group of; alkylene glycols, glycol monoethers, glycerins, and mixtures thereof; 0.01 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.01 to 5 wt. % of at least one of octanoic acid, nonanoic acid, dccanoic acid, nndecanoic acid, dodecanok acid, ueodecanok; acid benzoic acid, 2- hydroxybenzok. acid. p-terbutylbenzoic acid, and mixtures thereof In one embodiment, the composition is employed as a concentrate in admixture with 10 to 90 WL % water.