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. It can withstand the oxidation and corrosion of various strong oxides, and has good low friction, good flex resistance, corrosion resistance is better than other synthetic fiber varieties, but poor thermal conductivity, wear resistance is not good, thermal expansion coefficient Large, easy to generate static electricity

Therefore, pure PTFE fibers are not convenient for non-woven fabrics to be processed into high-temperature filter materials, and pure PTFE fiber filter materials have poor tensile strength and poor wear resistance, which affect the service life of filter materials.

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