Organomodified Silylated Surfactant Hydrolysis Resistance
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Solution Overview
Problem
Trisiloxane-type compounds used in agricultural compositions are unstable outside a narrow pH range of 6 to 7.5 and prone to rapid hydrolysis, limiting their effectiveness and application in wider pH conditions.
Innovation Solution
Development of organomodified silylated surfactants with a specific chemical formula that includes alkyleneoxide groups, allowing for enhanced resistance to hydrolysis across a broader pH range, achieved through hydrosilylation reactions with olefinically modified polyalkyleneoxides and suitable platinum catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If trisiloxane-type compounds are used in agricultural compositions, then wetting and spreading control is improved, but stability is worsened due to rapid hydrolysis outside pH 6-7.5
Solution Approach 1:
The patent changes the chemical structure parameters of the surfactant by replacing the traditional trisiloxane backbone with a silylated surfactant containing silicon-carbon bonds and specific functional groups (carboxylic acid, alcohol, or amine). This structural parameter change enables the surfactant to maintain stability across a broader pH range (pH 4-10) while retaining wetting and spreading effectiveness.
Solution Approach 2:
The invention creates a composite molecular structure that combines the hydrolytic stability of silicon-carbon bonds with the surfactant functionality of polar head groups and non-polar tail groups. The silylated surfactant acts as a composite material integrating the stability of silane chemistry with the surface-active properties needed for agricultural applications.
2Reliability
If the pH range for surfactant stability is narrowed to 6-7.5, then stability is improved, but adaptability is worsened due to inability to function in wider pH conditions
Solution Approach 1:
The patent modifies the chemical parameters of the surfactant by incorporating electron-withdrawing or electron-donating groups that stabilize the silicon-carbon bond against hydrolysis. The specific structural parameters (R1, R2, R3 groups and their configurations) are optimized to resist hydrolytic cleavage across pH 4-10, thereby expanding the operational pH window while maintaining stability.
Solution Approach 2:
The silylated surfactant is designed to perform multiple functions: it provides wetting, spreading, and emulsification capabilities while simultaneously maintaining stability across a universal pH range (pH 4-10). This multi-functional design eliminates the need to compromise between stability and adaptability, as the single compound achieves both goals.
3Reliability
If larger quantities of water are used to compensate for surfactant instability, then effectiveness is improved, but water usage increases
Solution Approach 1:
By changing the chemical stability parameters of the surfactant through silylation, the patent enables effective formulation at lower concentrations. The enhanced stability allows the surfactant to remain active for longer periods and at lower doses, reducing the total volume of aqueous solution needed to achieve the same effectiveness.
Solution Approach 2:
The patent replaces the unstable, short-lived traditional surfactant with a stable, long-lasting silylated alternative. This substitution eliminates the need to continuously replenish degraded surfactant, thereby reducing overall water consumption in applications where the composition is applied over time or stored before use.
4Ease of manufacture
If traditional surfactants are used in acidic or basic conditions, then agricultural spray effectiveness is reduced, but formulation simplicity is maintained
Solution Approach 1:
The patent changes the acid-base resistance parameters of the surfactant by incorporating hydrolysis-resistant silicon-carbon bonds and stable functional groups. This parameter modification allows the surfactant to maintain its surface-active properties in acidic (pH 4-6) and basic (pH 8-10) agricultural spray conditions without compromising formulation simplicity.
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 organomodified silylated surfactants demonstrate significant resistance to hydrolysis, maintaining stability at pH levels below 6 for over 6 months and above 7.5 for over a year, enhancing their utility in agricultural compositions and reducing water usage.
Implementation Method 1
the silylated surfactant compound exhibits resistance to hydrolysis over a wide pH range
Implementation Method 2
trisiloxane-type compounds have been found to be useful in enabling the control of these processes to achieve the desired effect
Data Source
AI summary
Organomodified silylated surfactant compositions that exhibit resistance to hydrolysis over a wide pH range.