Core-Shell Polymer Particles for VOC Scavenging
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Solution Overview
Problem
Current air treatment technologies are inadequate for effectively removing volatile organic compounds (VOCs) and microbial volatile organic compounds (mVOCs) from indoor air, particularly in confined spaces, as they may not absorb these contaminants efficiently and do not provide sufficient improvement in air quality.
Innovation Solution
An air treatment article comprising a semipermeable barrier and multi-staged non-film forming polymer abatement particles with a core polymer and shell polymer, where the core polymer accounts for 1 to 25 wt% of the particles, and the shell polymer has a high void fraction, allowing for effective scavenging of airborne contaminants like acetaldehyde, d-limonene, and other odoriferous VOCs and mVOCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon and zeolites are used for adsorption, then the air treatment article can remove some contaminants, but the effectiveness for VOCs and mVOCs is insufficient and unclear
Solution Approach 1:
The patent changes the chemical parameters of the adsorbent material by using polymer particles with specific functional groups (carboxylic acid, amine, hydroxyl) and controlled surface properties. The core-shell structure with specific polymer compositions (5-50 wt% polar monomers) and surface areas (10-1000 m²/g) creates optimized interaction parameters for VOCs and mVOCs, resolving the insufficient effectiveness of conventional activated carbon and zeolites
Solution Approach 2:
The patent employs composite polymer particles combining different polymer phases (core and shell with different compositions) to achieve synergistic effects. The composite structure integrates hydrophobic and hydrophilic regions, enabling simultaneous effective adsorption of various VOCs and mVOCs that single-material adsorbents cannot effectively remove
2Reliability
If a semipermeable barrier is used to prevent particle passage, then the particles can be retained, but the air flow and contaminant access to particles may be restricted
Solution Approach 1:
The semipermeable barrier is designed with local quality variations through its pore structure, allowing it to selectively retain particles while permitting air and contaminant molecules to pass through. The barrier's localized pore sizes and distributions are optimized to provide different functions in different regions, maintaining both particle retention and adequate air flow
Solution Approach 2:
The semipermeable barrier utilizes a porous structure with controlled pore sizes that are smaller than the polymer particles but larger than contaminant molecules. This porous architecture allows the barrier to function as a selective filter, retaining particles while enabling air flow and contaminant access to the particles on the other side
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 described air treatment article demonstrates exceptional contaminant scavenging ability, significantly reducing the concentration of odoriferous VOCs and mVOCs in indoor air, improving air quality and public health by effectively extracting these contaminants from the air.
Implementation Method 1
One of the ways of treating air involves adsorption, wherein the contaminants are adsorbed on to materials such as activated carbon and zeolites. However, it is unclear whether these materials absorb VOCs/mVOCs effectively.
Implementation Method 2
the semipermeable barrier permits passage therethrough by a for-treatment air containing a contaminant such that the for-treatment air can make contact with the non-film forming polymer abatement particles
Data Source
AI summary
An air treatment article is provided, comprising: a semipermeable barrier and a plurality of multi-staged non film forming polymer abatement particles having a core polymer and at least one shell polymer; wherein the core polymer accounts for 1 to 25 wt% of the weight of the non film forming polymer abatement particles; wherein the semipermeable barrier is disposed between an air atmosphere and the non film forming polymer abatement particles; wherein the semipermeable barrier impedes passage therethrough by the non film forming polymer abatement particles; wherein the semipermeable barrier permits passage therethrough by a for treatment air containing a contaminant such that the for treatment air can make contact with the non film forming polymer abatement particles; wherein the non film forming polymer abatement particles have an affinity for the contaminant.