Method for preparing pyrohydrolysis resisting polyimide fiber filter material

A technology of polyimide fiber and high temperature resistance, which is applied in the field of preparation of polyimide fiber filter material resistant to high temperature hydrolysis, which can solve the problems of water and oil repellency that are not resistant to hydrolysis, and achieve the effect of prolonging the service life

Active Publication Date: 2012-07-18
江苏东方滤袋股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the defects of poor hydrolysis resistance and poor water and oil repellency in the prior art of polyimide fiber filter material, the purpose of the present invention is to provide a preparation method of polyimide fiber filter material resistant to high temperature hydrolysis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The green body of the polyimide fiber filter material strengthened by needle punching is sprayed and suctioned to remove dust, pad-rolled with high-temperature hydrolysis-resistant finishing solution, and then pre-baked and baked to make high-temperature hydrolysis-resistant polyimide. Amine fiber filter. The specific process parameters are: (1) Preparation of the filter body: the surface density is 190g / m3 made of polyimide fiber 2 Upper and lower fiber layers, with a surface density of 100g / m 2 The middle layer of the polyimide yarn woven base cloth forms the green body of the polyimide fiber filter material, and its surface density is 480g / m 2 , the thickness is 2.0mm, the longitudinal breaking strength is 1282N, the longitudinal breaking elongation is 10%, the transverse breaking strength is 1224N, the transverse breaking elongation is 26%, and the grades of water spraying, water repellency and oil repellency are all grade 0; (2) Preparation High temperature resis...

Embodiment 2

[0046] The green body of the polyimide fiber filter material reinforced by needle punching is sprayed and suctioned to remove dust, padded with high-temperature hydrolysis-resistant finishing solution, and then pre-baked and baked to make high-temperature hydrolysis-resistant polyimide. fiber filter. The specific process parameters are: (1) Preparation of the filter body: the surface density is 210g / m3 made of polyimide fiber 2 Upper and lower fiber layers, with a surface density of 120g / m 2 The middle layer of the polyimide yarn woven base cloth forms the green body of the polyimide fiber filter material, and its surface density is 540g / m 2 , the thickness is 2.3mm, the longitudinal breaking strength is 1377N, the longitudinal breaking elongation is 18%, the transverse breaking strength is 1369N, the transverse breaking elongation is 29%, and the grades of water spraying, water repellency and oil repellency are all 0; (2) Preparation High temperature resistant hydrolysis fi...

Embodiment 3

[0048] The green body of the polyimide fiber filter material strengthened by needle punching is sprayed and suctioned to remove dust, pad-rolled with high-temperature hydrolysis-resistant finishing solution, and then pre-baked and baked to make high-temperature hydrolysis-resistant polyimide. Amine fiber filter. The specific process parameters are: (1) Preparation of the filter body: the surface density is 230g / m3 made of polyimide fiber 2 Upper and lower fiber layers, with a surface density of 140g / m 2 The middle layer of the polyimide yarn woven base cloth forms the green body of the polyimide fiber filter material, and its surface density is 600g / m 2 , the thickness is 2.8mm, the longitudinal breaking strength is 1446N, the longitudinal breaking elongation is 25%, the transverse breaking strength is 1613N, the transverse breaking elongation is 34%, and the grades of water spraying, water repellency and oil repellency are all grade 0; (2) Preparation High temperature resis...

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Abstract

The invention relates to a method for preparing a pyrohydrolysis resisting polyimide fiber filter material. The method is characterized by comprising the following steps of: padding a polyimide fiber three-layer structural body which is prepared by a non-weaving technology and serves as a filter material blank by using pyrohydrolysis resisting finishing liquor which is mainly prepared from polytetrafluoroethylene emulsion and epoxy phenolic resin; performing low-temperature migration prevention preliminary drying and high-temperature cross-linking baking to ensure that a membrane structure of polytetrafluoroethylene particles which are completely coated and uniformly dispersed is formed on the surface of a filter material fiber; and isolating high-temperature water vapor from being contacted with the fiber to obtain the filter material. The prepared filter material has the longitudinal and horizontal breaking strength retention rate of 100 percent to 111 percent when hydrolysed at a high continuous working temperature, a water repellency level and an oil repellency level are remarkably improved, and the filer material is difficult to damage, makes dust easily removed, cannot be adhered to a bag and cannot be hardened; a dust removal system is low in differential pressure, so that the service life of a filter bag is prolonged; and the method can be widely applied to dust removal and filtering of high-temperature flue gas generated by iron and steel, power generation, cement, waste incineration, coal burning boilers and the like, can be directly used for the conventional production equipment, has a simple process and is low in production cost.

Description

technical field [0001] The invention relates to a preparation method of a polyimide fiber filter material, in particular to a preparation method of a polyimide fiber filter material resistant to high temperature hydrolysis. The prepared filter material is resistant to hydrolysis and repellent under high temperature conditions The water and oil repellency performance is significantly improved, so that the filter material is not easy to be damaged, easy to clean dust, no sticky bags, no compaction, and the pressure difference of the dust removal system is small, which can be widely used in high-temperature flue gas such as steel, power generation, cement, waste incineration, and coal-fired boilers. Air dust filter. Background technique [0002] The bag filter is one of the environmental protection equipment for high-temperature flue gas purification and filtration, and the filter bag is the core component of the bag filter, and the filter material is the main raw material for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D46/02
Inventor 吴海波张旭东金平良殷保璞王洪王荣武黄健华李兵涛马月双
Owner 江苏东方滤袋股份有限公司
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