SDHI Fungicide Emulsion Concentrates for Crystal Growth Control
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Solution Overview
Problem
Existing SDHI fungicide formulations face challenges with rapid crystallization and instability in emulsion concentrates, particularly when polar aprotic solvents are used, leading to crystal growth and poor emulsion stability.
Innovation Solution
Combining a carbonyl containing solvent with an adjuvant of formula (I) (where X is 6-13, Y is 14-28, and Z is 3-13) to stabilize SDHI fungicides, minimizing crystal growth and enhancing emulsion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polar aprotic solvents are used in SDHI fungicide formulations, then solubility of the active ingredient is improved, but crystal growth occurs during water addition leading to poor emulsion stability
Solution Approach 1:
The patent introduces a specific intermediary substance (polyethylene glycol or polypropylene glycol with molecular weight 200-1000) that mediates between the polar aprotic solvent and water. This intermediary prevents crystal growth of the SDHI fungicide during water addition while maintaining solubility and emulsion stability, effectively resolving the contradiction between solubility enhancement and stability maintenance.
2Ease of manufacture
If water is added to emulsion concentrate compositions containing polar aprotic solvents, then dilution is achieved, but rapid crystallization of the active ingredient occurs
Solution Approach 1:
The patent applies preliminary action by incorporating the glycol intermediary substance into the emulsion concentrate formulation before dilution occurs. This pre-established protective mechanism prevents crystallization during the subsequent water addition process, allowing easy dilution without compromising formulation stability or causing active ingredient precipitation.
3Stability of the object's composition
If conventional solvents are used to achieve good emulsion stability, then emulsion properties are maintained, but crystal growth problems persist and efficacy is reduced
Solution Approach 1:
The patent changes the chemical parameter of the formulation by replacing conventional solvents with a specific glycol intermediary (polyethylene glycol or polypropylene glycol with molecular weight 200-1000). This parameter change simultaneously achieves good emulsion stability and prevents crystal growth, thereby maintaining reliable fungicidal efficacy without the drawbacks of conventional solvent systems.
Data Source
AI summary
An agrochemical emulsion concentrate composition comprising at least one SDHI fungicide, a carbonyl containing solvent and an adjuvant of formula (I) CxHy(EO)z-OH in which X is 6-13, Y is 14-28, and Z is 3-13.