Microcapsules for Thermal Evaporation of Pyrethroids
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Solution Overview
Problem
Conventional methods of heat evaporation for insecticidal compounds with low vapor pressure are not long-lasting and require specialized evaporation materials, limiting their effectiveness in controlling harmful arthropods.
Innovation Solution
Microcapsules encapsulating pyrethroid compounds with a volume median diameter of 2 to 100µm and a film thickness of 0.02 to 0.3µm, made from polyurethane, polyurea, or polyurethane-polyurea resins, and substantially free of hydrophobic organic solvents, are used for heat evaporation applications, allowing for controlled release of the insecticide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional heat evaporation methods are used for insecticidal compounds with low vapor pressure, then the compounds can be evaporated, but the insecticidal effect is not long-lasting
Solution Approach 1:
The insecticidal compound is segmented into microcapsules with diameter of 1 to 100 µm, creating numerous small particles that increase total surface area for evaporation while maintaining low vapor pressure compounds inside the capsules
Solution Approach 2:
The compound is transformed from bulk form to microcapsule form, changing physical parameters including surface area to volume ratio, which enhances evaporation rate and prolongs insecticidal effect duration
2Duration of action of moving object
If specialized evaporation materials are used to achieve long-lasting effect, then the insecticidal effect duration is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The microcapsule formulation can be used in conventional heat evaporation equipment without requiring specialized devices or materials, making the solution universally applicable to existing pest control systems
Solution Approach 2:
By changing the physical form of the compound to microcapsules, the system achieves enhanced performance using standard equipment rather than requiring complex specialized materials or devices
3Stability of the object's composition
If the vapor pressure of the insecticidal compound is low, then the compound stability is improved, but the evaporation rate and insecticidal effectiveness decrease
Solution Approach 1:
Dividing the compound into microcapsules increases the total surface area available for evaporation, compensating for low vapor pressure and maintaining effective evaporation rates while preserving compound stability
Solution Approach 2:
Transforming the compound into microcapsule form changes the surface area to volume ratio parameter, which enhances evaporation kinetics without affecting the chemical stability of the low vapor pressure compound
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 microcapsules provide a long-lasting pest control effect by gradually releasing the pyrethroid compound through evaporation without destroying the microcapsule film, effectively controlling harmful arthropods over an extended period.
Implementation Method 1
gradually releasing the pyrethroid compound through evaporation
Implementation Method 2
without destroying the microcapsule film
Data Source
AI summary
A microcapsule enclosing one or more compounds selected from pyrethroid compounds represented by Formula (1) or (2) wherein, Ra represents a hydrogen atom, a fluorine atom, or the like; Rb is a fluorine atom, a chlorine atom, or the like; Rc represents a hydrogen atom, and a methyl group. The volume median diameter of the microcapsule is 2 to 100µm, the thickness of the microcapsule is 0.02 to 0.3 µm, and the microcapsule is substantially free of a hydrophobic organic solvent.