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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 can maintain enhanced filtration performance without requiring additional charging methods.
Innovation Solution
The development of electret webs comprising a blend of a thermoplastic resin and a charge-enhancing additive, specifically mercapto-benzothiazole or mercapto-benzoxazole metal salts, which allows for efficient charging via DC corona discharge alone, enhancing their filtration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermoplastic resin webs are used for electret filtration, then the web structure is simple and easy to manufacture, but the charge retention and filtration performance are insufficient
Solution Approach 1:
The patent applies composite materials by combining thermoplastic resin with charge-enhancing additives (mercaptobenzothiazole or mercapto-benzoxazole metal salts) to create an electret web that achieves both improved charge retention and acceptable manufacturing complexity. The composite formulation allows the web to exhibit superior electret properties while maintaining a manageable composition structure.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition of the web through the addition of specific metal salts (divalent or trivalent) of mercapto-benzothiazole or mercapto-benzoxazole. These compositional parameter changes enable enhanced charge retention without fundamentally altering the web's structural parameters, thus balancing performance improvement with manufacturing feasibility.
2Reliability
If multiple charging methods are employed to enhance filtration performance, then the filtration efficiency improves, but the process complexity and time consumption increase
Solution Approach 1:
The patent applies self-service by designing a web composition that inherently responds to charging mechanisms. The charge-enhancing additives (mercaptobenzothiazole or mercapto-benzoxazole metal salts) enable the web to effectively utilize charging processes without requiring complex multi-step procedures. The composition itself facilitates efficient charge acquisition and retention through standard charging methods.
Solution Approach 2:
The patent uses parameter changes in the web's chemical composition to improve its responsiveness to charging processes. By incorporating specific metal salts, the web's electrical properties are modified, allowing it to achieve better filtration performance through simpler, more direct charging applications rather than requiring multiple complex charging steps.
3Reliability
If charge-enhancing additives are added to thermoplastic resin, then the electret properties are enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies composite materials by formulating a blend of thermoplastic resin with charge-enhancing additives (mercaptobenzothiazole or mercapto-benzoxazole metal salts). This composite approach enhances electret charge retention while maintaining a relatively straightforward manufacturing process, as the additives are incorporated into the resin matrix during standard web production.
Solution Approach 2:
The patent employs parameter changes by adjusting the chemical composition of the web through controlled addition of metal salt additives. These compositional modifications are integrated into existing manufacturing processes, allowing enhanced electret properties to be achieved without fundamentally redesigning the production line, thus balancing manufacturing ease with performance improvement.
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 electret webs demonstrate improved charge retention and filtration performance, achieving effective particle capture in aerosol filters with enhanced properties over traditional thermoplastic resin webs, particularly in filtration media applications.
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
Implementation Method 2
Other methods include, for example, charging the fibers after the web is formed, by means of a corona discharge
Implementation Method 3
electrets are effective in enhancing particle capture in aerosol filters
Data Source
AI summary
Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The additives are a mercapto-benzothiazole salts or mercapto-benzoxazole salts. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.