Stabilizing Aldehyde Surfactant Complex Solutions
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Solution Overview
Problem
Aldehydes, commonly used as biocidal agents, tend to lose efficacy due to cyclic molecular configuration at low concentrations and polymerize at higher concentrations, leading to instability and health hazards, requiring pre-dilution and activation which results in a corrosive and unstable solution.
Innovation Solution
A stable aqueous aldehyde solution is created by combining an aldehyde with a surfactant, pH modifier, and buffer, maintaining a pH range of 6.0 to 8.5 and using a surfactant such as alcohol ethoxylate, to prevent polymerization and enhance biocidal efficacy, while being stable for at least six months.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If aldehydes are used at low concentrations to reduce polymerization, then the tendency to polymerize is reduced, but the aldehyde molecules adopt a cyclic molecular configuration which results in loss of biocidal efficacy
Solution Approach 1:
The patent adjusts the pH parameter to a specific range (6.0-8.5) and controls aldehyde concentration (0.001% to 25% m/v) to prevent both cyclic configuration formation and polymerization. This parameter optimization allows the aldehyde to maintain monomeric form while retaining biocidal efficacy and stability for at least six months.
Solution Approach 2:
The invention creates a composite formulation by combining aldehyde with surfactants and buffers. The surfactant (0.1% to 25% m/v) and buffer system work synergistically with the aldehyde to stabilize the monomeric form and enhance biocidal efficacy, resolving the contradiction between stability and efficacy.
2Reliability
If aldehydes are used at higher concentrations to maintain biocidal efficacy, then the biocidal effect is maintained, but the aldehydes will polymerize with other aldehyde molecules resulting in loss of biocidal effect
Solution Approach 1:
The patent optimizes the pH parameter to 6.0-8.5 and controls aldehyde concentration at 0.001% to 25% m/v. This parameter control prevents polymerization while maintaining sufficient biocidal efficacy, allowing the solution to remain stable for at least six months without activation.
Solution Approach 2:
The surfactant acts as an intermediary substance that interferes with the polymerization process between aldehyde molecules. By incorporating surfactant (0.1% to 25% m/v) into the formulation, the patent prevents aldehyde-aldehyde interactions that would lead to polymerization, thereby maintaining both efficacy and stability.
3Reliability
If the aldehyde solution is diluted and activated by raising pH to increase biocidal reactivity, then the reactivity with amine groups is activated, but the stability of the solution is compromised to the extent that it is only stable for several days
Solution Approach 1:
The patent sets the pH parameter within the optimal range of 6.0-8.5, which is sufficient to activate biocidal reactivity without causing excessive instability. This pH optimization allows the aldehyde to react with amine groups effectively while maintaining solution stability for at least six months, eliminating the need for pre-activation.
Solution Approach 2:
The invention formulates a composite system containing aldehyde, surfactant (0.1% to 25% m/v), and buffer. This composite structure provides synergistic effects where the surfactant and buffer work together to stabilize the activated form of aldehyde, enabling long-term stability (at least six months) while maintaining biocidal reactivity without requiring dilution or activation before use.
4Quantity of substance
If the aldehyde solution is diluted before use, then the concentration is adjusted for application, but the user has to dilute and activate the product which increases complexity and reduces ease of operation
Solution Approach 1:
The patent performs preliminary formulation by pre-mixing the aldehyde with surfactant and buffer at optimal concentrations during manufacturing. This preliminary action ensures the solution is ready-to-use upon delivery to the user, eliminating the need for dilution and activation steps. The product is supplied in a stable, activated state that can be used directly.
Solution Approach 2:
The invention creates a universal formulation that combines multiple functions in a single product: the surfactant provides both stability enhancement and biocidal activity, the buffer maintains optimal pH for reactivity, and the aldehyde provides the primary biocidal effect. This multi-functional formulation eliminates the need for separate dilution and activation steps, greatly simplifying user operation.
5Reliability
If the pH is raised to activate the aldehyde solution, then the reactivity is increased, but the resultant solution becomes corrosive due to high pH
Solution Approach 1:
The patent optimizes the pH parameter to a moderate range of 6.0-8.5, which is sufficient to activate biocidal reactivity of the aldehyde without reaching the high pH levels that cause corrosiveness. This parameter optimization achieves the desired reactivity while avoiding harmful corrosive effects on surfaces and materials.
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 solution maintains biocidal efficacy, reduces volatility and toxicity, and provides greater stability and non-corrosive properties, allowing for longer storage and effective application as a biocidal dispersant without the need for pre-dilution or activation.
Implementation Method 1
the aldehyde is stabilized through the addition of a surfactant and buffer
Implementation Method 2
the aldehyde is also stabilized through the addition of a surfactant and buffer
Implementation Method 3
Raising the pH subsequently activates the aldehyde solution. The activation increases the reactivity of the aldehyde functional groups with the amine groups
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
The invention provides a method of manufacturing a stable aldehyde-surfactant complex solution wherein at least one aldehyde is added to a surfactant in a first aliquot of water, at a temperature of between 40°C to 5O°C, the aldehyde is allowed to interact with the surfactant or detergent, in a complexing reaction, for at least 15 minutes whilst maintaining the temperature between 40°C to 5O°C to produce an aldehyde-surfactant complex solution, and a second aliquot of water is added after at least 15 minutes to cool the aldehyde-surfactant complex solution to below 4O°C to stop the complexing reaction.