Polyethylene net or fabric grafted with a PVP hydrogel for the absorption and release of pyrethroids
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Solution Overview
Problem
Existing polyethylene supports lack specific absorption and release properties for organic molecules and inorganic compounds, particularly pyrethroid-class active substances and metal ions, limiting their effectiveness in insecticide delivery and environmental applications.
Innovation Solution
A polyethylene support is treated with a superficial hydrogel comprising polyvinylpyrrolidone (PVP) and ethylene glycol dimethylacrylate (EGDMA), enhancing its ability to absorb and release organic molecules and inorganic compounds, including metal ions, through a process involving immersion in specific solutions and washing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene support is used as is, then it provides structural strength and durability, but it lacks specific absorption and release properties for organic molecules and inorganic compounds
Solution Approach 1:
The patent applies local quality by modifying only the surface of the polyethylene support with a hydrogel layer containing PVP and EGDMA, while maintaining the bulk polyethylene structure for strength. This localized modification provides specific absorption properties for pyrethroids and metal ions without compromising the overall structural integrity of the support.
Solution Approach 2:
The patent creates a composite material system combining polyethylene (for structural strength) with a hydrogel layer containing PVP and EGDMA (for specific absorption properties). This composite structure integrates the advantages of both materials: the polyethylene provides durability while the hydrogel layer provides selective binding capabilities for pyrethroids and metal ions through coordination chemistry.
2Reliability
If conventional polymer supports with insecticides are used, then insecticidal action is provided, but they cannot absorb compounds and are not rechargeable
Solution Approach 1:
The patent utilizes parameter changes by exploiting the reversible coordination chemistry between the hydrogel functional groups and metal ions/pyrethroids. The support can absorb compounds from aqueous solutions and release them under different conditions (such as pH changes or competitive binding), enabling multiple cycles of charging and discharging, thus providing rechargeability while maintaining insecticidal action.
3Reliability
If insecticide is added to polyethylene, then insecticidal properties are enhanced, but the polymer composition weakens and becomes prone to breaking
Solution Approach 1:
The patent applies segmentation by separating the insecticidal function from the structural function. The bulk polyethylene maintains structural strength while a surface-bound hydrogel layer contains the insecticidal compounds. This segmentation prevents the weakening of the polymer matrix while still providing effective insecticidal properties through the surface layer.
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 treated polyethylene supports demonstrate significantly improved absorption and release capabilities for organic molecules and metal ions, enabling efficient pesticide delivery and metal ion removal from aqueous solutions, with the hydrogel being rechargeable and providing prolonged protection.
Implementation Method 1
a polyethylene support, on whose surface a hydrogel comprising polyvinylpyrrolidone (PVP) and ethylene glycol dimethylacrylate (EGDMA) was formed, which is provided with specific absorption and release properties of organic molecules and inorganic compounds
Implementation Method 2
the support according to the invention is provided with organic molecules and inorganic compounds absorption and release properties
Data Source
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AI summary
Polyethylene support in form of net or fabric, comprising, grafted on the surface of said support, a hydrogel comprising polyvinylpyrrolidone and absorbed to the hydrogel a pyrethroid. Method for preparing said support comprising the steps of: immersing the support in a toluene solution (Soil) containing: ethylene glycol dimethylacrylate (EGDMA) and cumene hydroperoxide (CHP); immersing the support in an aqueous solution (Sol2) containing: FeCl2 * 4H20, ascorbic acid and polyvinylpyrrolidone (PVP); washing and drying the support.