Herbicidal Composition Stability Through Crystal Growth Inhibition
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Solution Overview
Problem
Current herbicide combinations face issues with physical instability during manufacture and application, leading to Ostwald ripening, gelling, caking, and settling, which affect shelf life and efficacy, and do not effectively control resistant weeds without causing phytotoxicity to crops.
Innovation Solution
A stable herbicidal composition comprising a triazolone herbicide, a triazinone herbicide, a crystal growth inhibitor, and specific surfactants and dispersants, formulated as a suspension concentrate to prevent crystal growth and maintain stability during storage and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If herbicides are combined to control broader spectrum of weeds, then weed control effectiveness is improved, but physical stability of the composition deteriorates due to Ostwald ripening, gelling, caking, and settling
Solution Approach 1:
The patent introduces a non-ionic surfactant as an intermediary substance to mediate between the triazolone herbicide and triazinone herbicide. This surfactant prevents Ostwald ripening and maintains physical stability of the suspension concentrate formulation, allowing the herbicide combination to remain stable during storage and application while maintaining broad-spectrum weed control effectiveness
Solution Approach 2:
The patent creates a composite formulation system combining triazolone herbicide, triazinone herbicide, and non-ionic surfactant in specific ratios. This composite material approach ensures both the herbicidal effectiveness against broad spectrum weeds and the physical stability of the composition by leveraging the synergistic properties of the combined components
2Ease of operation
If suspension concentrate formulation is used, then ease of use and effectiveness are improved, but crystal growth and instability occur during storage
Solution Approach 1:
The non-ionic surfactant acts as a mediating agent that prevents crystal growth of the herbicides in the suspension concentrate formulation during storage. It maintains the suspended state of the active ingredients without allowing Ostwald ripening to occur, thus preserving both the ease of application and storage stability
Solution Approach 2:
The patent optimizes the concentration parameters of the non-ionic surfactant and the ratio of herbicides to achieve a stable suspension concentrate formulation. By adjusting these parameters within specific ranges, the formulation maintains physical stability during storage while retaining the operational advantages of suspension concentrate formulations
3Reliability
If herbicide combination is used to control resistant weeds, then weed control spectrum is improved, but phytotoxicity to crops increases
Solution Approach 1:
The patent optimizes the concentration ratios of triazolone herbicide to triazinone herbicide in the formulation. By controlling these parameters within specific ranges and using the non-ionic surfactant, the composition achieves effective control of resistant weeds while minimizing phytotoxicity to crops through reduced chemical stress
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 formulation achieves effective weed control with reduced phytotoxicity to crops and improved stability, ensuring even distribution and prolonged shelf life.
Implementation Method 1
A major drawback of formulating a slightly water-soluble ingredient as an aqueous SC is Ostwald ripening, which refers to instances in which the larger crystals of the ingredient grow while the smaller crystals dissolve.
Implementation Method 2
The composition comprises a crystal growth inhibitor in an amount ranging from 1% w/w to 20% w/w of the total weight of the formulation
Implementation Method 3
The composition comprises a non-ionic surfactant in an amount ranging from 1% w/w to 10% w/w of the total weight of the formulation
Implementation Method 4
Selection of appropriate partners/constituents constituting the suspension concentrate plays a critical role towards stability of the composition
Data Source
AI summary
An herbicidal composition comprising a triazolone herbicide, a triazinone herbicide and at least an agriculturally acceptable excipient is disclosed in this application. In addition, the application described a composition comprising a triazolone herbicide, a triazinone herbicide, a crystal growth inhibitor, and at least an agriculturally acceptable excipient. Further, the application disclose methods of controlling undesirable vegetation comprising applying the composition.