Absorbent Wick Liquid Ratio for Stable Pyrethroid Vaporization
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Solution Overview
Problem
Existing water-based insecticidal formulations with pyrethroid components, such as transfluthrin and metofluthrin, face instability in vaporization and diffusion due to unbalanced component affinities with conventional absorbent wicks, leading to impaired insect killing efficacy.
Innovation Solution
A thermal vaporization/diffusion absorbent wick with a specific water/oil-based liquid absorption ratio (0.55-1.0) is used in conjunction with a water-based insecticidal composition containing a pyrethroid insecticidal component and a glycol ether compound, ensuring stable vaporization and diffusion of the insecticidal components over a long period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-based formulation of transfluthrin, metofluthrin, or the like is prepared with a conventional absorbent wick, then the affinity of the water-based formulation for the absorbent wick becomes unbalanced, but the amount of the insecticidal component that is vaporized and diffused becomes unstable and insect killing efficacy is impaired
Solution Approach 1:
The patent modifies the liquid absorption ratio parameter of the absorbent wick to achieve a water/oil-based liquid absorption ratio within 0.5-1.5. This parameter change ensures that the absorbent wick can properly balance the affinity for water-based formulations containing high vapor pressure pyrethroids, resulting in stable vaporization and diffusion of the insecticidal component while maintaining reliable insect killing efficacy.
2Reliability
If an oil-based formulation is used, then the formulation is less effective in killing insect pests and has higher fire risk, but the vaporization and diffusion performance is stable
Solution Approach 1:
The patent changes the formulation type from oil-based to water-based while simultaneously modifying the absorbent wick's liquid absorption ratio parameter. This dual approach maintains stable vaporization performance (by optimizing the wick's affinity balance) while eliminating the fire hazards and improving insect killing efficacy associated with oil-based formulations.
3Stability of the object's composition
If the absorbent wick specifications are modified to improve water-based formulation compatibility, then the vaporization stability improves, but the device complexity increases
Solution Approach 1:
The patent focuses on changing a single key parameter of the absorbent wick - the liquid absorption ratio - to within the range of 0.5-1.5. By targeting this specific parameter rather than modifying multiple wick specifications, the patent achieves stable vaporization of water-based formulations while minimizing increases in device complexity.
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
This configuration achieves stable vaporization and diffusion performance, maintaining high insect killing efficacy for extended periods, effectively controlling flying insect pests including mosquitoes and other susceptible species.
Implementation Method 1
putting an absorbent wick in a chemical liquid containing an insecticidal component, allowing the chemical liquid to be absorbed and transported to the top portion of the absorbent wick
Implementation Method 2
heating the absorbent wick so that the insecticidal component is vaporized and diffused into the atmosphere
Implementation Method 3
the insecticidal component is vaporized and diffused into the atmosphere
Data Source
AI summary
An insect pest control product applicable to a water-based insecticidal composition with stable performance over a long time, which comprises a thermal vaporization/diffusion absorbent wick for vaporizing and diffusing a water-based insecticidal composition containing a pyrethroid insecticidal component having a vapor pressure of 2×10−4 to 1×10−2 mmHg at 30° C., a glycol ether compound having a boiling point of 150-300° C., and water. The wick has a water/oil-based liquid absorption ratio (V1/V2) within the range of 0.55-1.0, calculated from a speed (V1) at which a water-based liquid formulation rises through the wick, and a speed (V2) at which an oil-based liquid formulation rises through the wick, the water-based liquid formulation contains 40 mass % of diethylene glycol monobutyl ether, and the oil-based liquid formulation is a fluid paraffin having 14 carbon atoms.