Polytetrafluoroethylene membrane filter material and preparation method thereof

A polytetrafluoroethylene, membrane-coated filter material technology, applied in membrane filters, separation methods, chemical instruments and methods, etc., can solve the problem of slow production speed, high production energy consumption, and adhesion fastness of polytetrafluoroethylene membranes. Not high problems, to achieve the effect of long-life filtering effect

Pending Publication Date: 2018-05-22
ZHEJIANG YANPAI FILTRATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] What the present invention aims to solve is the problem that the adhesion fastness of the existing polytetrafluoroethylene film is not high, the production speed is slow, and the production energy consumption is high.

Method used

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  • Polytetrafluoroethylene membrane filter material and preparation method thereof
  • Polytetrafluoroethylene membrane filter material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step: if figure 1 As shown, the areal density is 600g / m 2 1. The surface of the needle-punched felt 3 of polyester fiber with a thickness of 2.0mm is coated with a polyvinyl fluoride aqueous solution with a solid content of 30% and a dispersant mass content of 10%, and its sizing amount is 30g / m 2 ;

[0029] The second step: sending the coated polyester fiber needle felt 3 obtained in the first step into an oven with a temperature of 195°C for pre-baking for 4 minutes;

[0030] Step 3: Send the PTFE microporous membrane 1 with a thickness of 4 μm and an average pore diameter of 2 μm into a hot rolling mill at a temperature of 300° C. by preheating the hot roll 2 of the cladding mill;

[0031] The fourth step: send the dried needle felt 3 obtained in the second step into the hot rolling mill, and compound it with the PTFE microporous membrane 1 preheated by the hot roller 2 under a pressure of 1Mpa, and the compounding speed is 10m / min;

[0032] The fifth st...

Embodiment 2

[0034] The first step: the surface density is 550g / m 2 , Acrylic fiber needle-punched felt 3 with a thickness of 2.2mm is coated with a layer of polyvinylidene fluoride aqueous solution with a solid content of 25% and an emulsifier mass content of 9%, and its sizing amount is 15g / m 2 ;

[0035] The second step: put the coated acrylic fiber needle felt 3 obtained in the first step into an oven at 180°C for pre-baking for 2 minutes;

[0036] Step 3: Send the PTFE microporous membrane 1 with a thickness of 5 μm and an average pore diameter of 2.5 μm into a hot rolling mill at a temperature of 250° C. by preheating the hot roll 2 of the cladding mill;

[0037] The fourth step: send the dried needle felt 3 obtained in the second step into the hot rolling mill, and compound it with the PTFE microporous membrane 1 preheated by the hot roller 2 under a pressure of 2Mpa, and the compounding speed is 20m / min;

[0038] Step 5: Send the PTFE-coated filter material obtained in the fourth...

Embodiment 3

[0040] The first step: the surface density is 500g / m 2 , aramid fiber needle felt 3 with a thickness of 2.0mm is coated with a layer of chlorotrifluoroethylene-ethylene copolymer aqueous solution with a solid content of 20% and an emulsifier mass content of 10%, and its sizing amount is 15g / m 2 ;

[0041] The second step: put the coated acrylic fiber needle felt 3 obtained in the first step into an oven at 260°C for pre-baking for 4 minutes;

[0042] The third step: the PTFE microporous membrane 1 with a thickness of 4 μm and an average pore diameter of 1.5 μm is sent into a hot rolling mill at a temperature of 300 ° C by preheating the hot roll 2 of the cladding mill;

[0043] The fourth step: Send the dried needle felt 3 obtained in the second step into the hot rolling mill, and compound it with the PTFE microporous membrane 1 preheated by the hot roller 2 under a pressure of 1.5Mpa, and the compounding speed is 15m / min ;

[0044] Step 5: Send the PTFE-coated filter mater...

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Abstract

The invention discloses a polytetrafluoroethylene membrane filter material and a preparation method thereof. The polytetrafluoroethylene membrane filter material comprises a PTFE micro-porous membrane, a fluoropolymer bonding layer and a punched felt bottom layer which are sequentially compounded. The preparation method comprises the following steps: coating the surface of the punched felt with afluoropolymer to make the upper fiber surface of the punched felt wrapped with a layer of a low surface energy adhesive, cladding a hot roll with the PTFE micro-porous membrane to preheat the PTFE micro-porous membrane, allowing the PTFE micro-porous membrane to enter a rolling mill rolling seam, and carrying out hot rolling on the PTFE micro-porous membrane and the fiber punched felt, wherein thePTFE micro-porous membrane is fully heated before being compounded in order to improve the adherence fastness of the PTFE micro-porous membrane and the punched felt and improve the membrane production rate. A unique gluing and hot bonding technology is adopted to make the surface of a punched filter material coated with the PTFE micro-porous membrane in order to obtain the membrane filter material with a high PTFE membrane adherence fastness and achieve high-efficiency, low-resistance and long-life filtering effects.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene film-coated filter material and a preparation method thereof, belonging to the technical field of industrial filter materials. Background technique [0002] With the rapid development of modern industrial processes in various countries in the world, environmental problems have become increasingly prominent. Chemical industry, electric power, iron and steel, metallurgy, waste incineration and other industries will produce a large amount of high-temperature smoke and dust during the production process, causing serious pollution to the environment. All countries in the world have formulated emission control measures for high-temperature smoke and dust generated in industrial production. In the comprehensive discharge standard of air pollutants (GB 16297-1996) formulated by my country in 1996, smoke and dust particles are listed as one of the main control objects, and the export concentration of dust is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B32B27/08B32B27/02B32B37/06B32B37/12
CPCB01D39/16B01D39/1623B32B27/08B32B37/06B32B37/1207B32B2037/1215B01D2239/08B01D2239/10
Inventor 孙尚泽裘春湖杨勇勇陈标辉王洪
Owner ZHEJIANG YANPAI FILTRATION TECH
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