Microencapsulated Pyrethroid and Benzoylurea Co-Formulation
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Solution Overview
Problem
Existing insecticide formulations combining benzoylurea and pyrethroids face challenges in achieving stability and reducing skin irritation, while also ensuring environmental safety.
Innovation Solution
A microencapsulated formulation of pyrethroid insecticides solubilized in vegetable oil and encapsulated in a polymeric shell wall, combined with a suspension concentrate of benzoylurea, to create a stable co-formulation that minimizes skin irritation and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If benzoylurea and pyrethroids are combined in a formulation, then synergistic insecticidal effect is achieved, but formulation stability deteriorates due to incompatible physico-chemical profiles
Solution Approach 1:
The formulation is segmented into two distinct components: microencapsulated pyrethroid particles and suspended benzoylurea particles. This segmentation allows each active ingredient to be delivered in a compatible physical state, preventing incompatibility issues while maintaining synergistic effectiveness.
Solution Approach 2:
The pyrethroid is transformed from a liquid or soluble state into microencapsulated particles with controlled size distribution (0.1-10 μm). This parameter change in physical state and size enables stable co-formulation with benzoylurea suspension while controlling release characteristics.
2Speed
If pyrethroids are used for knock-down action, then immediate insecticidal effect is achieved, but skin irritation increases
Solution Approach 1:
Pyrethroid is enclosed in microcapsules with thin polymeric shell walls that provide protective barrier function. This shell prevents direct skin contact with the irritant pyrethroid while allowing controlled release of the active ingredient for maintaining knock-down speed.
Solution Approach 2:
The microcapsule shell acts as an intermediary between the pyrethroid active ingredient and the environment/skin. It mediates the release of pyrethroid, reducing direct exposure and skin irritation while still delivering the insecticidal effect.
3Reliability
If conventional insecticide formulations are used, then pest control effectiveness is achieved, but environmental safety deteriorates
Solution Approach 1:
The microcapsule structure provides a porous matrix that controls the release of pyrethroid. This controlled release mechanism reduces environmental runoff and pollution while maintaining effective pest control through sustained action.
Solution Approach 2:
Changing the physical state of pyrethroid to microencapsulated form and combining with benzoylurea creates a formulation with reduced environmental persistence and pollution potential while maintaining or enhancing pest control effectiveness through synergistic action.
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 a stable co-formulation of pyrethroids and benzoylurea with enhanced stability and reduced skin irritation, while maintaining effective insecticidal activity and environmental safety.
Implementation Method 1
an organic phase comprising a pyrethroid insecticide solubilized in vegetable oil
Implementation Method 2
encapsulated in a capsule having a polymeric shell wall made by an interfacial polymerization reaction occurring between an organic phase emulsified in an aqueous phase
Implementation Method 3
an organic phase emulsified in an aqueous phase
Data Source
AI summary
The present invention provides a microencapsulated formulation comprising a pyrethroid insecticide solubilized in vegetable oil or derivatives thereof, the solubilized pyrethroid insecticide being encapsulated in a capsule having a polymeric shell wall. The invention also provides a process of preparing said microencapsulated formulation. The invention further provides a co-formulation comprises microencapsulated formulation of pyrethroid and a suspension concentrate comprising benzoylurea insecticide.