Unlock instant, AI-driven research and patent intelligence for your innovation.

Finishing process of pyrohydrolysis-resistant polyimide filtering material

A filter material, polyimide technology, applied in the direction of filtration separation, dispersed particle filtration, dispersed particle separation, etc., can solve the problems of filter bag fracture strength drop, bag sticking, affecting filter bag dust removal efficiency and service life, etc., to achieve The effect of not being hydrolyzed

Inactive Publication Date: 2014-01-08
KUNSHAN WANFENG GARMENT
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PI fibers are prone to hydrolysis in acid and alkali environments, and do not have the characteristics of water and oil repellency, if PI fibers are used to make filter bags, the breaking strength of the filter bags will easily decrease or the phenomenon of sticking bags will seriously affect the quality of the filter bags. Dust removal efficiency and service life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A finishing process for a high-temperature hydrolysis-resistant polyimide filter material, comprising the steps of:

[0014] (1) Preparation of filter material body: PI fibers are opened, mixed, carded, and cross-laid to obtain two layers of fiber webs, and the PI yarn woven base fabric is used as the middle layer, and the filter material is obtained through acupuncture reinforcement. material, and then spray, suction, and dust removal to obtain a clean filter material body;

[0015] (2) Preparation of impregnation finishing solution: 9.5% PTFE emulsion, 11.5% epoxy phenolic resin, 0.5% thermosetting acrylate, 0.3% vinyltriethoxysilane, 2.5% polyethylene Alcohol, 0.5% glycerol, 0.5% ethanol, 0.4% benzyl silicone oil and water are prepared as impregnating finishing solution;

[0016] (3) Padding finishing process: impregnating and finishing the PI fiber filter material with the finishing liquid, impregnating the rolls twice and extruding the rolls once, the line pressur...

Embodiment 2

[0019] A finishing process for a high-temperature hydrolysis-resistant polyimide filter material, comprising the steps of:

[0020] (1) Preparation of filter material body: PI fibers are opened, mixed, carded, and cross-laid to obtain two layers of fiber webs, and the PI yarn woven base fabric is used as the middle layer, and the filter material is obtained through acupuncture reinforcement. material, and then spray, suction, and dust removal to obtain a clean filter material body;

[0021] (2) Preparation of impregnation finishing solution: 24.5% by mass percentage of PTFE emulsion, 7.5% epoxy phenolic resin, 0.7% thermosetting acrylate, 0.1% vinyltriethoxysilane, 4.5% polyethylene Alcohol, 0.3% glycerol, 0.6% ethanol, 0.2% benzyl silicone oil and water are prepared into impregnation finishing liquid;

[0022] (3) Pad finishing process: impregnate and finish the PI fiber filter material with finishing liquid, impregnate two rolls and squeeze one roll, the line pressure betwe...

Embodiment 3

[0025] A finishing process for a high-temperature hydrolysis-resistant polyimide filter material, comprising the steps of:

[0026] (1) Preparation of filter material body: PI fibers are opened, mixed, carded, and cross-laid to obtain two layers of fiber webs, and the PI yarn woven base fabric is used as the middle layer, and the filter material is obtained through acupuncture reinforcement. material, and then spray, suction, and dust removal to obtain a clean filter material body;

[0027] (2) Preparation of impregnation finishing solution: 15% by mass percentage of PTFE emulsion, 10% epoxy phenolic resin, 0.6% thermosetting acrylate, 0.2% vinyltriethoxysilane, 3.5% polyethylene Alcohol, 0.4% glycerol, 0.55% ethanol, 0.3% phenylmethyl silicone oil and water are prepared into impregnation finishing liquid;

[0028] (3) Padding finishing process: PI fiber filter material is impregnated with finishing liquid, two rolls are impregnated and one roll is squeezed, the line pressure...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a finishing process of a pyrohydrolysis-resistant polyimide (PI) filtering material. The finishing process of the pyrohydrolysis-resistant PI filtering material comprises the following steps: (1) preparing a filtering material blank; (2) preparing a dip finishing liquid; (3) performing a dip rolling finishing process; and (4) performing a pre-roasting and roasting process. The finishing process of the pyrohydrolysis-resistant PI filtering material has the beneficial effects that the surface density, the thickness and the longitudinal and transverse breaking strength retention ratios of the PI filtering material subjected to pyrohydrolysis-resistant finishing are more than 100 percent; and one fluorine-containing finishing agent protective layer is formed on the surface of the PI filtering material fiber, so the PI fiber can be effectively protected and is difficult to hydrolyze under the conditions of high temperature and high humidity, and the filtering material has water-repellent and oil-repellent properties.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, and in particular relates to a finishing process of a high-temperature hydrolysis-resistant polyimide filter material. Background technique [0002] In 2012, the State Council issued the newly revised "Ambient Air Quality Standards", which included PM2.5 in the "National Standards", and the control of air pollution has become a hot spot of concern. Bag filter can effectively control air pollution by purifying and filtering high-temperature flue gas. High-temperature-resistant filter material is the key material for filtering, so it has become an important subject of air pollution control research. [0003] Commonly used high temperature resistant filter materials are mainly glass fiber filter materials, aramid fiber filter materials, polytetrafluoroethylene (PTFE) fiber filter materials, polyphenylene sulfide (PPS) fiber filter materials, polyimide (PI) fiber filter mat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/04B01D46/02
Inventor 姚建平
Owner KUNSHAN WANFENG GARMENT