Filter element and its preparation method and application

Abstract

The invention discloses a filter element, which comprises a breathable carrier, and at least one surface of the breathable carrier is provided with a graphene oxide layer. The filter element of the present invention has good filtering effect and stable filter layer structure without falling off. The method for preparing the filter element comprises the following steps: step 1, dispersing graphite oxide in a solvent to obtain a graphene oxide solution or graphene oxide gel with a mass fraction of 0.01%-5%; step 2, dispersing the graphene oxide in step 1 The solution or graphene oxide gel is attached to the surface of the gas-permeable carrier by spraying, dipping, scraping, screen printing or brushing, and a graphene oxide layer is formed on the surface of the gas-permeable carrier; step 3, attaching the gas-permeable carrier in step 2 The gas-permeable carrier of the graphene oxide layer is dried. The filter element is used as an air filter layer in masks, air conditioning filters, and air purifiers.

Description

technical field [0001] The invention relates to the filtration of particles in gas, in particular to a filter element and its preparation method and application. Background technique [0002] With the development of the economy, the environment in which people live has been seriously polluted. Especially in recent years, haze weather has appeared on a large scale in China. The composition of pollutants in the air of haze weather is very complex. What are harmful to health are mainly aerosol particles with a diameter of less than 10um, especially those with a diameter of less than 2.5um, namely PM2.5. For these PM2.5, it is particularly harmful to the human body, because the surface of these particles will be loaded with a large amount of harmful carcinogens, and because these particles are very small, they can easily enter the alveoli and then enter the blood, so they are extremely harmful. Traditional dust and haze masks have too large pore diameters to effectively block...

AI Technical Summary

Problems solved by technology

[0004] First, after using the above-mentioned masks for a period of time, it was found that the graphene coating attached to the surface of the non-woven fabric was easy to fall off, forming pollutants

The initial applicant did not care about the falling off of the graphene coating. After replacing the new mask, the same problem also existed, indicating that the adhesion between the graphene coating and the non-woven fabric was poor;

[0005] Second, when the above-mentioned mask is in use, the user will have difficulty breathing;

[0006] For the above two defects, the applicant has carried out long-term research and analysis based on the preparation process of the mask, but has not found that the process itself has the above-mentioned influence on the graphene coating

After no problem was found in the process, we continued to search for the cause of the defect, and finally found that the defect was caused by the graphene material itself, specifically: because graphene is a two-dimensional structure composed of carbon six-membered rings (2D) The periodic honeycomb lattice structure has caused graphene to have a repelling effect on absolute ethanol solution, resulting in poor dispersion of graphene in absolute ethanol solution. This situation makes it difficult to uniformly distribute graphene on the one hand. Coated on non-woven fabric, on the other hand, even after attaching, the graphene coating is easy to fall off because of poor adhesion

In addition, the X-ray diffraction spectrum of the graphene coating found that due to the small interlayer spacing of graphene, and after a period of use, particles will block the graphene coating, resulting in poor breathing for users.

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