Dual Insect Repellent Polymer Gels for Extended Release
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Solution Overview
Problem
Current insect repellents, such as DEET, have short efficacy durations due to rapid evaporation and dermal absorption, and existing polymer-insect repellent systems suffer from phase separation and mechanical property issues, limiting their effectiveness and safety in outdoor protection.
Innovation Solution
Development of a miscible polymer-insect repellent composition, specifically using poly (acrylonitrile-co-vinyl chloride) with DEET, allowing for high insect repellent loading and extended release, combined with auxiliary pesticides like transfluthrin and nootkatone for enhanced repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer melting processing is used to form insect repellent-infused materials, then the materials can be manufactured into finished products, but high temperatures cause vaporization and loss of insect repellent
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature melting (above flash point) to low-temperature dissolution (below flash point), preventing vaporization and loss of insect repellent while still enabling formation of the finished product
Solution Approach 2:
The patent introduces a solvent as an intermediary substance that enables polymer dissolution and insect repellent incorporation at low temperatures, acting as a medium that facilitates manufacturing without requiring high heat that would cause vaporization
2Quantity of substance
If high insect repellent loading is achieved in polymer systems, then repellency efficacy is improved, but phase separation occurs between insect repellent and polymer
Solution Approach 1:
The patent changes the processing temperature parameter to remain below the flash point of the insect repellent, preventing vaporization and loss of concentration during manufacturing while maintaining high loading capacity
Solution Approach 2:
The patent creates a composite material system where polymer, solvent, and insect repellent are combined in a specific formulation that maintains miscibility and prevents phase separation, achieving high insect repellent loading without compromising compositional stability
3Ease of manufacture
If polymer melting is performed above flash point of insect repellent, then processing is simplified, but safety concerns arise from vaporization
Solution Approach 1:
The patent changes the temperature parameter from above flash point to below flash point, eliminating the safety hazard of vaporization while maintaining manufacturing feasibility through solvent-mediated dissolution
Solution Approach 2:
The solvent acts as an intermediary that enables processing without high temperatures, serving as a safe medium that allows polymer and insect repellent to be incorporated without reaching dangerous temperature thresholds
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 composition achieves extended mosquito repellency of over 30 weeks with minimal loss, improved safety, and increased efficacy through dual-modal mechanisms, surpassing previous materials in duration and effectiveness.
Implementation Method 1
a polymer that is miscible in the first insect repellent compound at 23° C.
Implementation Method 2
allowing for high insect repellent loading and extended release
Data Source
AI summary
A composition comprising a first insect repellent compound, a second insect repellent compound, and a polymer that is miscible in the first insect repellent compound at 23° C. The polymer is dissolved in the first insect repellent compound. An example first insect repellent compound is N,N-diethyl-meta-toluamide, and example second insect repellent compounds are nootkatone, permethrin, or transfluthrin.