High-temperature filter material and preparation method and application thereof

Abstract

The invention provides a high-temperature filter material and a preparation method and application thereof. The high-temperature filter material is composite filter cloth with a single layer structure or composite filter cloth with a multi-layer structure, and the composite filter cloth is prepared from, by mass, 10%-90% of Podlon fibers and 10%-90% of polytetrafluoroethylene fibers. The preparation method of the composite filter cloth with the single layer structure in the high-temperature filter material comprises the steps of raw material mixing, opening, carding, web lapping, multi-layer fiber web layer forming, needle-punching, shaping, calendering and finished product obtaining; The preparation method of the composite filter cloth with the multi-layer structure in the high-temperature filter material comprises the steps of raw material mixing, opening, carding, web lapping, multi-layer fiber web layer forming, combined needle-punching, compound needle-punching, shaping, calendering and finished product obtaining. According to the application of the high-temperature material, the composite filter cloth with the single layer structure or the composite filter cloth with the multi-layer structure is used for high-temperature flue gas dust removal equipment. The high-temperature filter material has the advantages of being high in strength and having certain density and elasticity and is of an astatic three-dimensional structure which can be a single-layer structure or a multi-layer structure.

Description

technical field [0001] The invention relates to a filter material, in particular to a high-temperature filter material and its preparation method and application. Background technique [0002] The chemical name of pure Baodelun fiber is polyarylene oxadiazole fiber (referred to as POD fiber, trade name Baodelun). Baodelun is an inorganic fiber that can be used for a long time at a high temperature of 250°C, and can be used for a short time at 300°C. The operating temperature can reach 400°C. Good dimensional stability at high temperature: the dry heat shrinkage rate is 1% at 300°C, and there is almost no shrinkage when burning. Chemical resistance: Except for concentrated sulfuric acid, oleum and trifluoroacetic acid, Baodren is insoluble in any known solvents, and its resistance to organic solvents is exceptionally outstanding; Baodren's chemical structure is relatively stable, and its alkali resistance is better than acid resistance ; The fiber has flexibility, high elon...

AI Technical Summary

Problems solved by technology

[0003] However, due to the poor corrosion resistance of Baodren fiber to some chemical substances, especially the filter material used in acidic high-temperature environment is easy to be corroded, therefore, the filter material made of pure Baodren fiber has the above-mentioned problems. defect

[0004] The PTFE fiber is not only resistant to high temperature, its fiber melting point is 327°C, and the actual use temperature is 240-260°C; PTFE fiber has excellent chemical stability, and has the advantages of high humidity resistance, corrosion resistance, and hydrolysis resistance.

Images