Ultrahigh-temperature resistant composite filtering material and preparation method therefor

Abstract

The invention provides an ultrahigh-temperature resistant composite filtering material and a preparation method therefor and belongs to the technical field of materials. The ultrahigh-temperature resistant composite filtering material is used for solving the problem of the existing filtering materials that characteristics such as high-temperature resistance are insufficient. The ultrahigh-temperature resistant composite filtering material comprises a base fabric layer, wherein a head-on layer is stuck to one side of the base fabric layer, a bottom layer is stuck to the other side of the base fabric layer, the base fabric layer is made from a filament mesh fabric, and the filament mesh fabric is made from basalt fibers through weaving; the head-on layer is made from a head-on mesh fabric, the head-on mesh fabric is made from chopped polyethylene fibers through weaving, the bottom layer is made from a bottom face mesh fabric, the bottom face mesh fabric is made from chopped polyethylene fibers through weaving, and the chopped polyethylene fibers have the weight of 2.20dtex to 2.24dtex and the length of 60mm to 68mm; and the base fabric layer, the head-on layer and the bottom layer are all soaked with an impregnant, and the impregnant is an aqueous polyimide resin composite solution. The ultrahigh-temperature resistant composite filtering material has more outstanding performance in aspects such as high-temperature resistance, pyrohydrolysis resistance, high-temperature strength retentivity and high-temperature oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a filter material used for treating harmful discharge substances, in particular to a composite filter material with super high temperature resistance and a preparation method thereof. Background technique [0002] Environmental pollution has become an important factor affecting the sustainable development of society and economy, which has attracted great attention from the society and the government. Due to the continuous improvement of environmental protection requirements, the government has successively issued many more demanding and stricter air pollutant emission standards. [0003] At present, the bag dust removal technology is one of the main means of flue gas dust removal, and the filter material is the core component that determines the effect of the filter. The application market has put forward higher requirements for the performance of high-temperature resistant filt...

AI Technical Summary

Problems solved by technology

[0006] 2. High-temperature hydrolysis resistance: Many high-temperature flue gases have high water content, such as garbage incinerators, and the current filter material has poor high-temperature hydrolysis resistance, which shortens the service life of the filter bag

Especially the filter material of glass fiber base cloth, due to the poor high temperature hydrolysis resistance of glass fiber, it is easy to cause damage when it is used in a high temperature flue gas environment with high humidity

[0007] 3. High temperature strength retention: The current post-treatment impregnating agent of filter material is mainly acrylic resin, and the long-term high temperature resistance of acrylic resin is lower than 200 degrees, and thermal decomposition begins to occur when the temperature exceeds 260 degrees. The bonding strength between the facing layer, the bottom layer and the base fabric decreases rapidly

[0008] 4. Resistance to high temperature oxidation: The structure of flue gas components is complex, usually containing various corrosive gases, and under high temperature conditions, corrosive gases are more corrosive to the filter fiber, and the current high temperature corrosion resistance of the filter fiber sex is relatively poor