Manufacturing method for high-accuracy coating filter material

Abstract

The invention provides a manufacturing method for a high-accuracy coating filter material, which has the advantages of good binding effect between the filter material and PTFE (Polytetrafluoroethylene) and capability of improving the performance of the filter material. The method comprises the following steps of: (1) thermal cleaning treatment, performing the thermal cleaning treatment on the filter material and removing various auxiliary agents on the surface of the filter material through high temperature; (2) dipping treatment, performing PTFE dipping treatment on the filter material which is subjected to the thermal cleaning treatment; (3) sequentially performing baking, drying and thermal forming treatment on the filter material which is subjected to the dipping treatment; (4) performing coating treatment on the filter material which is subjected to thermal forming; and (5) sequentially performing volatile treatment, baking treatment, sintering treatment and thermal forming treatment on the filter material which is subjected to the coating treatment. In the manufacturing method for the high-accuracy coating filter material, the thermal cleaning treatment is performed before the filter material is subjected to the dipping treatment, so that a wire drawing impregnating agent remained on the surfaces of fibers can be effectively removed, meanwhile, no loss strength of a textile is guaranteed; and the acid and alkali resistance, water resistance, oxidation resistance, wear resistance and folding resistance of the filter material are effectively improved, and the service life of the filter material is prolonged.

Description

technical field [0001] The invention relates to a manufacturing method of a filter material, in particular to a manufacturing method of a high-precision coating filter material. Background technique [0002] At present, most of the temperature-resistant filter and dust-removing cloth bags used in bag-type dust collectors in cement, power plants, steel, carbon black and other industries are made of single material weaving or non-woven, which expose themselves during use. Defects: First, there are different degrees of defects in a single material, such as poor temperature resistance and oxidation resistance of PPS filter material; P84 fiber has poor hydrolysis resistance and high price; PTFE fiber has low tensile strength and high price; glass fiber The folding resistance and wear resistance are slightly worse. The second is to use a filter material made of a single material. Even if the formed powder layer is filtered, the filtration speed should not be too high, otherwise i...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the temperature-resistant filter and dust-removing cloth bags used in bag-type dust collectors in cement, power plants, steel, carbon black and other industries are made of single material weaving or non-woven, which expose themselves during use. Defects: First, there are different degrees of defects in a single material, such as poor temperature resistance and oxidation resistance of PPS filter material; P84 fiber has poor hydrolysis resistance and high price; PTFE fiber has low tensile strength and high price; glass fiber The folding resistance and wear resistance are slightly worse

The second is to use a filter material made of a single material. Even if the formed powder layer is filtered, the filtration speed should not be too high, otherwise it will be easy to permeate, so the filtration effect is not ideal.

The third is that the flue gas dust produced by different dust points has different temperature, humidity, dust concentration, chemical composition, particle size distribution in the dust, and the composition and content of harmful gases in the flue gas. materials, it is difficult to effectively filter smoke and dust

At the same time, in some dust removal points with high dust concentration, small dust particle size, many corrosive components, high moisture content in flue gas, and large temperature fluctuations, higher requirements are put forward for the performance of filter materials. Emission concentration has become a major difficulty in smoke and dust removal in various working conditions. Ordinary filter materials can no longer meet the filtration requirements of similar working conditions.

[0003] Therefore, it is necessary to add a PTFE impregnated layer on the filter material. In the existing method of coating the filter material, the sizing agent used during wire drawing will remain on the surface of the yarn, which will affect the bonding effect of PTFE and the filter material fiber during the impregnation process. It is not conducive to the formation of a protective film on the surface of the filter fiber, thus affecting the improvement of the overall performance of the fabric

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