Polyurea Microcapsule Insecticide Formulation for Extended Field Life
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Solution Overview
Problem
Existing insecticide formulations, especially liquid-based ones, lose efficacy soon after application, requiring frequent reapplication and increasing costs due to vulnerability to infestation and short post-application activity periods.
Innovation Solution
Insecticide formulations with a polymer shell formed from a mixture of cross-linking amine and hydrophobic isocyanate monomer, encapsulating insecticides, providing a stable aqueous microcapsule with a polyurea shell of specific thickness and molar ratio, extending the effective field life and maintaining insecticidal activity for at least 14 days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid-based insecticide formulations are used, then ease of application is improved, but duration of action deteriorates (efficacy is lost soon after application)
Solution Approach 1:
The insecticide is pre-encapsulated in a polymer shell before application, creating a reservoir that releases the active ingredient over time. This preliminary encapsulation action allows the formulation to maintain efficacy for extended periods while remaining easy to apply as a liquid suspension.
Solution Approach 2:
The patent uses a polymer shell (thin film) to encapsulate the insecticide. This flexible shell structure protects the active ingredient while allowing controlled release, thereby extending the duration of action without compromising ease of application.
2Reliability
If frequent reapplication of insecticides is performed, then reliability of insect control is improved, but loss of time and increased cost deteriorate
Solution Approach 1:
The encapsulated insecticide formulation provides continuous insecticidal action through controlled release from the polymer shell. This continuity eliminates the need for frequent reapplication, maintaining reliable pest control while reducing the time and resources spent on repeated applications.
3Duration of action of moving object
If thicker polymer shells are used to extend duration, then duration of action is improved, but manufacturing precision deteriorates (difficulty in controlling shell thickness)
Solution Approach 1:
The patent employs interfacial polycondensation reactions with controlled molar ratios of reactants to precisely control polymer shell thickness. By adjusting reaction parameters such as monomer concentration, cross-linking agent ratio, and reaction conditions, uniform shells with thicknesses between 2-20 nm are achieved, extending effective field life while maintaining manufacturing precision.
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 encapsulated insecticides exhibit improved chemical and physical stability, maintaining effectiveness and reducing toxicity to mammals and environmental impact, with extended duration of action compared to non-encapsulated formulations.
Implementation Method 1
a water insoluble polyurea shell wall prepared by an interfacial polycondensation reaction between a water soluble cross-linking amine and an oil soluble isocyanate monomer
Implementation Method 2
an insecticide at least partially encapsulated by the polymer shell
Data Source
Figure 1
AI summary
Insecticide formulations having improved chemical and physical stability and related methods are disclosed. The insecticide formulations may include a plurality of microcapsules, each including at least one organophosphate insecticide (e.g., chlorpyrifos-methyl) at least partially surrounded by a polymer shell. The insecticide formulations may be used to control insect populations by singular or periodic applications. The microcapsule polymer shell of the insecticide formulations may be formed by combining a cross-linking amine and a hydrophobic monomer (e.g., an isocyanate) at a molar ratio of amine to isocyanate groups of less than about 1:1.