Pyrethroid Capsule Suspension for Soil and Foliar Application
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Solution Overview
Problem
Current pyrethroid formulations for soil application have low active ingredient concentration, requiring high application rates and stressing the soil with adjuvants and inert materials, while deltamethrin is deemed unsuitable for soil use due to poor availability and lack of effective formulations for both soil and foliar uses.
Innovation Solution
Development of capsule suspension concentrates comprising a particulate disperse phase with a reaction product of isocyanate-reactive compounds and pyrethroids in an organic solvent, combined with a liquid aqueous phase containing protective colloids, ensuring high active ingredient loading, low application rates, and adequate bioavailability and long-term activity for both soil and foliar uses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If solid granule formulations are used for soil application, then the formulation is stable and easy to handle, but the active ingredient concentration is low requiring high application rates
Solution Approach 1:
The invention changes the physical state of the formulation from solid granules to liquid capsule suspension, enabling higher active ingredient concentrations (5-50% w/w) while maintaining stability and ease of application. This parameter change resolves the contradiction by allowing concentrated active ingredient delivery without requiring high application rates.
Solution Approach 2:
The invention uses composite microcapsules containing pyrethroid active ingredients suspended in a liquid carrier system with stabilizing agents. This composite structure enables high active ingredient loading while maintaining formulation stability and applicability, resolving the contradiction between concentration and application efficiency.
2Reliability
If high application rates are used to achieve adequate bioavailability, then the active ingredient availability is sufficient, but the soil is stressed with adjuvants and inert materials
Solution Approach 1:
The invention changes the formulation parameters to achieve high active ingredient concentration (5-50% w/w) in a liquid suspension, which reduces the total volume and amount of adjuvants and inert materials applied to the soil. This maintains adequate bioavailability while minimizing soil stress from formulation auxiliaries.
Solution Approach 2:
The invention extracts and removes excessive adjuvants and inert materials from the formulation by concentrating the active ingredient in a minimal liquid carrier system. This extraction of unnecessary components reduces soil stress while maintaining the required bioavailability of the pyrethroid active ingredient.
3Adaptability or versatility
If deltamethrin is formulated for foliar use only, then the formulation effectiveness is high for leaf applications, but it is unsuitable for soil use due to poor availability
Solution Approach 1:
The invention creates a universal liquid capsule suspension formulation that effectively serves both foliar and soil application purposes. The formulation contains 5-50% w/w pyrethroid active ingredient in a liquid carrier system that provides adequate bioavailability in both application scenarios, making deltamethrin suitable for dual use without compromising reliability in either context.
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 capsule suspension concentrates provide high active ingredient availability and prolonged activity in various soil conditions, reducing the need for excessive adjuvants and inert materials, and demonstrate effectiveness in both soil and foliar applications.
Implementation Method 1
capsule suspension concentrates comprising a particulate disperse phase A) and a liquid aqueous phase B)
Data Source
AI summary
The present invention relates to aqueous capsule suspensions based on various pyrethroids, to the production thereof and to the use thereof in the form of an agrochemical formulation, especially for soil application.