Oil-Continuous Herbicidal Dispersions for Chemical and Physical Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Formulating stable herbicidal compositions with high loadings of lipophilic and insoluble herbicides is challenging due to chemical instability, mutual reactivity, and poor physical stability, especially in water-based dispersions.
Innovation Solution
The development of non-water-continuous herbicidal dispersion compositions with an oil continuous phase and a dispersed phase, where the weight ratio of the nonaqueous liquid to the acetamide herbicide is optimized, and the use of specific dispersing agents and rheology modifiers to enhance stability and flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water-based dispersions are used to formulate herbicidal compositions with high loadings of ionic compounds, then the compositions can be easily applied and dispersed, but the dispersion stabilizing ingredients become ineffective and physical stability deteriorates due to ionic dissociation
Solution Approach 1:
The patent changes the fundamental parameter of the continuous phase from water-based to oil-based. This parameter change prevents ionic dissociation of the herbicidal compounds, maintaining both application effectiveness and physical stability. The oil-based continuous phase creates an environment where ionic compounds remain associated, preventing the breakdown that occurs in water-based systems.
Solution Approach 2:
The patent introduces oil-based dispersants and emulsifiers as intermediary substances that mediate between the ionic herbicidal compounds and the oil-based continuous phase. These intermediaries enable the formation of stable oil-based dispersions by reducing interfacial tension and preventing aggregation, thus maintaining physical stability without requiring water-based systems.
2Stability of the object's composition
If non-water-continuous dispersions are used to maintain physical stability with ionic actives, then dispersing agents remain effective, but the solubility and ionic dissociation of polar compounds are reduced
Solution Approach 1:
The patent employs oil-based dispersants and emulsifiers as intermediary substances that bridge the gap between polar ionic herbicidal compounds and the non-polar oil-based continuous phase. These intermediaries have amphiphilic characteristics, with portions that interact with the ionic compounds and portions that interact with the oil phase, thereby enhancing solubility and maintaining physical stability simultaneously.
Solution Approach 2:
The patent creates composite dispersion systems combining multiple components: ionic herbicidal compounds, oil-based continuous phase, and oil-based dispersants/emulsifiers. This composite material approach allows the system to exhibit properties that none of the individual components possess alone, specifically achieving both high solubility of ionic compounds and long-term physical stability in a non-aqueous environment.
3Productivity
If high loadings of multiple active ingredients are combined in concentrate compositions, then transport and storage become more economical and mixing errors are reduced, but chemical instability and mutual reactivity increase
Solution Approach 1:
The patent changes the solvent system parameter from water-based to oil-based, which fundamentally alters the chemical environment. This parameter change reduces chemical reactivity between different herbicidal active ingredients that would otherwise react in aqueous systems, thereby maintaining chemical stability even at high concentrations and enabling economical transport and storage.
Solution Approach 2:
The patent introduces oil-based dispersants and emulsifiers as intermediary substances that physically separate and stabilize different active ingredients in the concentrate formulation. These intermediaries prevent direct contact and potential reactions between incompatible herbicides while maintaining their individual efficacies, thus ensuring chemical stability in high-loading concentrate compositions.
4Stability of the object's composition
If dispersions are formulated to be highly stable against sedimentation, then storage stability is improved, but apparent viscosity increases and flowability decreases
Solution Approach 1:
The patent changes the continuous phase parameter from water to oil, which fundamentally alters the rheological properties of the dispersion. Oil-based continuous phases provide better lubrication and reduced interparticle friction, allowing the formulation to maintain high storage stability through effective dispersant action while preserving low apparent viscosity and excellent flowability for easy application.
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 proposed solution achieves improved chemical and physical stability of herbicidal compositions, maintaining efficacy over prolonged storage and varying temperature conditions, and allows for high loadings of herbicides without compromising stability or flowability.
Implementation Method 1
an oil continuous phase comprising an acetamide herbicide and a nonaqueous liquid
Implementation Method 2
a dispersed phase in the oil continuous phase and comprising a solid phase herbicide
Implementation Method 3
the use of specific dispersing agents and rheology modifiers to enhance stability and flowability
Data Source
AI summary
The present invention relates to various pesticidal compositions including non-water-continuous herbicidal dispersion compositions and processes for preparing these compositions. The present invention further relates to herbicidal application mixtures including water continuous dispersion compositions, processes for preparing these application mixtures, and various methods of use. Further, the present invention relates to various herbicidal compositions having improved application properties.