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Hybrid filter for filtering out fine and ultrafine dust

A technology of filter and water-based adhesive, which is applied in the direction of membrane filter, filtration separation, and dispersed particle filtration, etc. It can solve the problems of being unable to block the inhalation of Sox and NOx into the body, and achieve good removal rate and low air flow resistance.

Inactive Publication Date: 2021-02-09
因德博莱株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the non-woven fabric made of polypropylene can physically filter fine dust like a sieve, it cannot prevent the unfiltered ultra-fine state of highly polar Sox and NOx from being inhaled into the body, so there are limitations.

Method used

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  • Hybrid filter for filtering out fine and ultrafine dust
  • Hybrid filter for filtering out fine and ultrafine dust
  • Hybrid filter for filtering out fine and ultrafine dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] Embodiment Manufacture of hybrid filter

[0041] Step 1: Preparation of Dip Solution

[0042] To manufacture a hybrid filter, an appropriate viscosity of cellulose nanofibers and an appropriate content of an aqueous binder play a role as important factors. The average diameter of the cellulose nanofibers was 20 nm, and water-dispersed polyurethane was used as the water-based binder. Cellulose nanofibers and a water-based binder were mixed in water to prepare an impregnation solution according to the composition shown in Table 1.

[0043] Step 2: Impregnation of the porous support

[0044] As the porous support, a soft reticulated polyurethane foam was used. In the immersion solution of various compositions prepared in the above-mentioned step 1, the soft reticulated polyurethane foam was fully immersed for about 10 minutes, and then taken out and dried at room temperature for one day to manufacture a hybrid filter.

[0045]It was observed by scanning electron...

experiment example 1

[0046] Evaluation of the impregnation amount of the mixture of cellulose nanofibers and aqueous binder in the hybrid filter

[0047] The impregnation amount was calculated by the following mathematical formula.

[0048] Impregnation amount = {(weight of dried foamed plastics after dipping-weight of foamed plastics before dipping) / weight of foamed plastics before dipping}×100

[0049] Table 1

[0050]

[0051]

[0052] As shown in Table 1 above, when the concentration of cellulose nanofibers is increased, the amount of impregnation tends to increase regardless of the content of the water-dispersible polyurethane binder. In addition, even if the concentration of the water-dispersible polyurethane used as a binder is lowered, the amount of impregnation tends to hardly decrease. Furthermore, the degree of formation of cellulose nanofiber films in the open cells of the flexible polyurethane foam increases as the content of cellulose nanofibers increases.

[0053] Regardin...

experiment example 2

[0054] Observation of the morphology of cellulose nanofibers adhered to the open cells of flexible polyurethane foam

[0055] exist Figure 4 to Figure 6 The formation of cellulose nanofibrous membranes in the open cells of flexible polyurethane foams has been confirmed in .

[0056] In this regard, in order to understand whether the nanofiber morphology with high specific surface area is still maintained in the cellulose nanofiber membrane, Figure 7 (Scale bar: 2 μm) Shown will be further enlarged Figure 4 to Figure 6 (Scale bar: 500 μm) After observation.

[0057] as Figure 7 As shown, it can be known that the cellulose nanofibers adhered in the fine structure of pores of the hybrid filter according to an embodiment of the present invention still maintain the fine nanofiber structure after adhesion.

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Abstract

The present invention is directed to a hybrid filter for filtering out fine and ultrafine dust. The hybrid filter, in which cellulose nanofibers are adhered to a porous support by an aqueous binder, according to the present invention is a hybrid filter that is not a conventional filter having a multilayer structure but a filter having a single layer. The hybrid filter according to the present invention has low airflow resistance and excellent fine pollutant filtration rate.

Description

technical field [0001] The invention relates to a hybrid filter for filtering fine dust and ultrafine dust. Background technique [0002] Fine dust not only induces respiratory diseases, but also poses various threats to human health, so it is very worrying. The country is therefore working to reduce the generation of fine dust and is increasing the wearing of masks as a means of defense at the personal level. [0003] According to the Ministry of Environment, more than half of fine dust is composed of Sox and NOx. Therefore, the fine dust mask should be able to prevent such polar substances from being inhaled into the body. Most face masks today physically rely on a sieve-like method of filtering fine dust, often primarily using non-woven fabrics. Also, the most widely used nonwovens are made from polypropylene. However, although the non-woven fabric made of polypropylene can physically filter fine dust like a sieve, it cannot block the inhalation of unfiltered ultra-fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00B01D46/54
CPCB01D46/00B01D46/0036B01D46/543B01D39/1676B01D39/18B01D2239/025B01D2239/0421B01D2239/0654B01D2239/08B01D46/0001B01D46/546B01D2239/0464B01D2239/1233
Inventor 柳殷相
Owner 因德博莱株式会社
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