Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt

Abstract

The invention relates to a heat-resistant filter felt, a preparation method thereof and a composite filter felt prepared from the heat-resistant filter felt. The preparation method comprises the stepsthat modified polyphenylene sulfide fibers and polytetrafluoroethylene fibers are blended and then subjected to needling or spunlace processing, the heat-resistant filter felt is prepared, wherein the modified polyphenylene sulfide is polyphenylene sulfide with each sulfur atom randomly connected with N oxygen atoms, and the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.50-1.77: 1. After the prepared heat-resistant filter felt is subjected to thermo-oxidative aging for 100 hours under the air condition that the temperature is 280 DEG C, the tensile strength retention rate is 90% or above. The composite filter felt prepared from the heat-resistant filter felt is mainly composed of base cloth and the heat-resistant filter felt compounded withthe base cloth. The preparation method disclosed by the invention is simple in process and low in cost; the prepared heat-resistant filter felt is excellent in heat resistance; the composite filter felt prepared from the heat-resistant filter felt is excellent in heat resistance and mechanical property and has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of high-performance industrial textile materials, and relates to a heat-resistant filter felt, a preparation method thereof and a composite filter felt made therefrom, in particular to a modified polyphenylene sulfide with a high glass transition temperature A filter felt obtained by blending fibers and polytetrafluoroethylene fibers, a preparation method thereof and a composite filter felt made therefrom. Background technique [0002] With the development of society, environmental issues have attracted more and more public attention. The main source of air pollutants today is the combustion of fossil fuels, of which emissions from coal-fired thermal power plants account for a large proportion. At present, thermal power stations generally need to treat exhaust gas before discharging exhaust gas, and dust removal is a key step in exhaust gas treatment. At present, thermal power stations mostly use high-temp...

AI Technical Summary

Problems solved by technology

[0003] However, in practical applications, the flue gas temperature often exceeds 150°C, and the high temperature environment will aggravate the aging problem of PPS fibers, which results in a short service life of PPS fiber mats and increases the cost of waste gas treatment

In order to overcome this problem, the patent 201220079645.5 adds polytetrafluoroethylene fiber to polyphenylene sulfide fiber to make polyphenylene sulfide fiber / polytetrafluoroethylene fiber composite felt, which prolongs the service life, but the polytetrafluoroethylene fiber The processing difficulties brought about by surface self-lubrication, creep and low strength characteristics limit the amount of polytetrafluoroethylene added, which makes it difficult to further improve the service life of the composite felt. At the same time, the polyphenylene sulfide fiber in the composite felt The aging problem will still affect the overall life of the composite felt, and this method does not fundamentally solve the problem of poor heat resistance of high-temperature filter materials

[0004] Therefore, it is of great practical significance to fundamentally solve the poor heat resistance of polyphenylene sulfide fiber and develop a filter felt with excellent heat resistance.