Water-Indicating Paste Stability via Proton Donating Compounds
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Solution Overview
Problem
Existing water-indicating paste compositions are prone to false color changes due to trace moisture during storage and handling, leading to instability and reduced shelf life, despite previous attempts to address these issues with boron-containing compounds and other additives.
Innovation Solution
Incorporating a proton donating compound with a pKa of not more than 12, such as organic acids like nonanoic acid or dodecylbenzene sulfonic acid, into the paste composition, which is miscible with polyalkylene glycol carriers, to enhance stability and shelf life while maintaining the ability to detect aqueous liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-indicating paste compositions are formulated with traditional moisture inhibitors (boron-containing compounds), then water tolerance is improved, but shelf life is still limited due to trace moisture penetration during manufacture and storage
Solution Approach 1:
The patent changes the chemical parameter of the moisture inhibitor from boron-containing compounds to proton donating compounds with pKa ≤ 12. This parameter change fundamentally alters the inhibition mechanism, providing superior stability against trace moisture during manufacture and storage, thereby extending shelf life while maintaining water tolerance.
Solution Approach 2:
The proton donating compound acts as an intermediary substance that mediates between the indicator system and trace moisture. It donates protons to neutralize trace base contaminants and prevents premature color change, while not interfering with the water detection function when aqueous liquids are present.
2Measurement precision
If the paste composition is made more sensitive to detect trace water, then detection precision is improved, but false color changes occur during storage due to trace moisture
Solution Approach 1:
The proton donating compound provides preliminary anti-action by preemptively neutralizing trace base contaminants and moisture during storage. This prevents the conditions that would trigger false color changes, allowing the paste to maintain its stable color until actual water contamination occurs.
Solution Approach 2:
The patent converts the harmful effect of trace moisture into a beneficial stabilization mechanism. The proton donating compound reacts with trace moisture and base contaminants to create a stable environment, transforming what would be a source of false positives into a protective mechanism that enhances storage stability.
3Duration of action of stationary object
If proton donating compounds with pKa ≤ 12 are incorporated into the paste, then shelf life and water tolerance are improved, but the composition complexity increases
Solution Approach 1:
The patent simplifies the composition by changing the key parameter from using complex boron-containing compounds to simpler proton donating organic acids with pKa ≤ 12. This parameter change reduces composition complexity while achieving superior performance in shelf life and water tolerance.
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 paste composition exhibits improved water tolerance and extended shelf life, remaining stable under humid conditions and allowing for rapid color change upon contact with aqueous liquids, effectively preventing false positives and maintaining accuracy over time.
Implementation Method 1
Incorporating a proton donating compound with a pKa of not more than 12, such as organic acids like nonanoic acid or dodecylbenzene sulfonic acid, into the paste composition
Implementation Method 2
an indicator dye capable of changing color in the pH range between about 3 and about 11
Data Source
AI summary
A visual indicating paste composition is provided which is capable of producing a detectable color change upon contact with an aqueous liquid. The paste composition includes: an indicator dye capable of changing color in the pH range between about 3 and about 11; an inorganic base capable of being converted to a more basic substance upon reaction with water; a liquid carrier (such as a polyalkylene glycol carrier); optionally, a gelling agent such as silica gel; and a proton donating compound such as a carboxylic acid or organosulfonic acid. When applied to a measuring probe, the paste composition is particularly adapted for detecting the water level in the bottom of tanks and delivery systems containing a fuel such as gasoline by producing a clear detectable color change without bleeding or run-off upon contact with an aqueous liquid. The paste composition exhibits long shelf life and improved water tolerance.