Air filtering material with porous particles

Abstract

The invention discloses an air filtering material with porous particles. The air filtering material consists of an upper non-woven fabric layer and a lower non-woven fabric layer, as well as a porous particle layer clamped between the upper non-woven fabric layer and the lower non-woven fabric layer, wherein the porous particle layer at least comprises 5 wt% or more of porous particles containing an -R-CONHNH2 structure and has the pore volume of 0.4-1.5 cm<3>/g. The air filtering material with the porous particles has the characteristics of high formaldehyde removal efficiency, low probability of secondary stinking and longer service life and can be applied to such filtering fields as automobiles, household purifiers and clean rooms.

Description

technical field [0001] The invention relates to an air filter material containing porous particles. Background technique [0002] In recent years, with the rapid increase in the number of buildings and automobiles, industrial pollution has become increasingly serious, leading to an increase in the emission of harmful gases, which has a serious impact on indoor and outdoor air quality. On average, people spend more than 80% of their time indoors every day, and indoor air quality is particularly critical to human health. The most prominent pollutant in indoor environmental pollution is formaldehyde. Formaldehyde comes from floor leather, chemical fiber carpets, plastic wallpapers commonly used in interior decoration, and most adhesives, plywood, etc. can release formaldehyde. Especially in newly decorated rooms, offices, hotels, and furniture stores, building materials stores, etc., the formaldehyde content in the air is higher. [0003] At present, the methods for removing ...

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Problems solved by technology

The photocatalytic method has considerable limitations, it needs to be irradiated by ultraviolet light, the conversion efficiency is low, and the oxidation is non-selective; while the noble metal catalytic method mainly uses silver, platinum, palladium and other noble gold as a catalyst to convert formaldehyde Oxidation, and the cost of noble metal catalysts is generally high, and there will be catalyst poisoning, which will make the catalyst invalid

At present, the adsorption method is used to remove formaldehyde, but the filter material held by conventional activated carbon is difficult to remove the mixed gas containing aldehyde gas. The adsorption capacity of activated carbon is small, the adsorption is non-selective, and basically has no removal effect on low-concentration pollutants. And it is easy to desorb and cause secondary pollution

[0004] For example, Chinese patent CN203183812U discloses a composite filter material for adsorption and purification. Although the activated carbon layer in the composite filter material can be used to adsorb general gases in the air, the removal effect is not obvious for aldehyde gases, and because it is Relying on the pure physical adsorption of activated carbon, it is easy to produce secondary odor

[0005] Another example is that the Chinese published patent CN104645926A discloses a kind of air filter material containing porous particles. Although the filter material can be used to absorb general gases in the air, and has a certain initial removal effect on aldehyde gases, formaldehyde is only compatible with the filter material. The -NHHN-group-containing agent on the surface of the porous particle reacted, and the final total adsorption capacity of formaldehyde was not high, so the service life of the filter material was not long; and when the -NHHN- group-containing agent on the surface of the porous particle After the agent and formaldehyde fully react and fail, the next formaldehyde adsorption mainly depends on the physical adsorption function of porous particles, because only the agent containing -NHHN- groups on the surface of the porous particles in the filter material reacts with formaldehyde, so it will Quickly transfer from the chemical adsorption stage to the physical adsorption stage, and when only the physical adsorption function is left, the filter material is prone to secondary odor