Electret Webs with Triazine Phenolate Additives
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Solution Overview
Problem
There is a need for electret webs with improved properties that can be easily charged through various mechanisms such as tribocharging, corona discharge, or hydrocharging, and are effective in filtration applications.
Innovation Solution
The development of electret webs containing a blend of a thermoplastic resin and a charge-enhancing additive, specifically substituted triazine phenolate salts, which facilitate enhanced charging and filtration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charging methods (corona discharge, tribocharging, hydrocharging) are used to form electret materials, then particle capture capability is improved, but the complexity of the charging process and equipment requirements increases
Solution Approach 1:
The patent incorporates charge-enhancing additives during the fiber formation process itself, rather than requiring separate charging steps afterward. The additives are built into the electret material during manufacturing, enabling subsequent simple charging methods like corona discharge or tribocharging to work more effectively with reduced equipment complexity.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electret material by incorporating specific charge-enhancing additives (such as metal salts, organic compounds, or inorganic particles). These parameter changes in the material composition enable enhanced charging efficiency and particle capture capability without requiring complex charging equipment.
2Productivity
If charge-enhancing additives are added to polymeric compositions to improve electret performance, then charging efficiency is improved, but the complexity of material formulation and manufacturing increases
Solution Approach 1:
The patent creates composite electret materials by combining thermoplastic resin fibers with charge-enhancing additives. These additives can be metal salts, organic compounds, or inorganic particles that are incorporated during the fiber formation process. The composite structure enables enhanced charging efficiency while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The charge-enhancing additives are distributed throughout the electret material in a way that optimizes local charging characteristics. The additives are positioned and concentrated in regions where charging occurs during filtration operations, enabling improved charging efficiency without requiring complex formulation processes.
3Reliability
If electret materials are charged through multiple mechanisms (tribocharging, corona discharge, hydrocharging), then filtration performance is improved, but the time and resources required for charging increases
Solution Approach 1:
The patent develops electret materials with charge-enhancing additives that can be effectively charged through multiple mechanisms including tribocharging, corona discharge, and hydrocharging. The universal design of the electret material with incorporated additives enables it to gain sufficient charge through any of these methods, improving filtration performance without requiring time-consuming multi-step charging processes.
Solution Approach 2:
The charge-enhancing additives are built into the electret material during manufacturing, enabling the material to be easily charged during normal filtration operations. The additives facilitate self-charging through contact with aerosols and particles, reducing or eliminating the need for separate, time-consuming charging steps.
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 use of substituted triazine phenolate salts in electret webs results in improved charging efficiency and filtration performance, making them suitable for applications in air filters and respirators by enhancing particle capture capabilities.
Implementation Method 1
An electret is a dielectric material that exhibits a quasi-permanent electrical charge. Electrets are useful in a variety of devices including, e.g. cling films, air filters, filtering facepieces, and respirators, and as electrostatic elements in electro-acoustic devices such as microphones, headphones, and electrostatic recorders.
Implementation Method 2
The performance of microfibrous webs used for aerosol filtration can be improved by imparting an electrical charge to the fibers, forming an electret material.
Implementation Method 3
Other methods include, for example, charging the fibers after the web is formed, by means of a corona discharge
Implementation Method 4
electrets are effective in enhancing particle capture in aerosol filters
Data Source
AI summary
Electret webs include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a substituted triazine phenolate salt or a combination of substituted triazine phenolate salts. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.