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High-flux thick polytetrafluoroethylene film and preparation method thereof

A technology of polytetrafluoroethylene membrane and polytetrafluoroethylene, which is applied in the field of high-flux thick polytetrafluoroethylene membrane and its preparation, can solve the problems that the thickness, porosity and air permeability cannot be satisfied at the same time, and reach the service life Long, good filtering effect, high work efficiency

Active Publication Date: 2016-10-05
上海灵氟隆新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the defect that the single-layer / multi-layer polytetrafluoroethylene membrane in the prior art cannot simultaneously meet the thickness, porosity and air permeability required by the high-temperature filter material for the polytetrafluoroethylene membrane, Provided is a high-throughput thick polytetrafluoroethylene membrane and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of high flux thick polytetrafluoroethylene membrane, it comprises the steps:

[0039] (1) 2 single-layer polytetrafluoroethylene films are aligned and stacked to form a laminated double-layer film; wherein, the porosity of the single-layer polytetrafluoroethylene film is 80%, and the thickness of the single-layer polytetrafluoroethylene film 0.006mm and a width of 2000mm;

[0040] (2) Feed the laminated double-layer film into the hot-air bonding device through a steel feed roller, and perform a hot-air bonding process on the laminated double-layer film with a hot air flow, so that the laminated double-layer film The upper surface of the film absorbs heat and softens and bonds with the polytetrafluoroethylene film of the lower floor; wherein, the number of nozzles of the first hot air flow is 2, and the pressure of the first hot air flow out of the nozzle is 1.5MPa, and the temperature of the first hot air flow The temperature is 270°C, the moving s...

Embodiment 2

[0047] A preparation method of high flux thick polytetrafluoroethylene membrane, it comprises the steps:

[0048] (1) 3 single-layer polytetrafluoroethylene films are aligned and stacked to form a stacked three-layer film; wherein, the porosity of the single-layer polytetrafluoroethylene film is 80%, and the thickness of the single-layer polytetrafluoroethylene film 0.006mm and a width of 2000mm;

[0049] (2) Feed the laminated three-layer film into the hot-air bonding device through a steel feed roller, and perform one hot-air bonding process on the laminated three-layer film with the first hot air flow, so that the laminated three-layer The upper surface of the film absorbs heat and softens and bonds with the polytetrafluoroethylene film of the lower floor; wherein, the number of nozzles of the first hot air flow is 2, and the pressure of the first hot air flow out of the nozzle is 2MPa, and the temperature of the first hot air flow is 330°C, the moving speed of the laminat...

Embodiment 3

[0056] A preparation method of high flux thick polytetrafluoroethylene membrane, it comprises the steps:

[0057] (1) 4 single-layer polytetrafluoroethylene films are aligned and stacked to form a stacked four-layer film; wherein, the porosity of the single-layer polytetrafluoroethylene film is 80%, and the thickness of the single-layer polytetrafluoroethylene film 0.006mm and a width of 2000mm;

[0058] (2) Feed the laminated four-layer film into the hot-air bonding device through a steel feed roller, and perform one hot-air bonding process on the laminated four-layer film with the first hot air flow, so that the laminated four-layer film The upper surface of the film absorbs heat and softens and bonds with the polytetrafluoroethylene film of the lower floor; wherein, the number of nozzles of the first hot air flow is 2, and the pressure of the first hot air flow out of the nozzle is 2.5MPa, and the temperature of the first hot air flow 350°C, the moving speed of the laminat...

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Abstract

The invention discloses a high-flux thick polytetrafluoroethylene film and a preparation method thereof. The method comprises the following steps that 1, a plurality of single-layer polytetrafluoroethylene films are aligned and overlapped to form an overlapped multilayer film; 2, the overlapped multilayer film is fed into a hot air bonding device through a feeding roll, and I-time bonding treatment is carried out through hot airflow I so that the upper surface of the overlapped multilayer film can absorb heat to be softened and be bonded with the polytetrafluoroethylene film on the lower layer; 3, tension is adjusted; 4, II-time hot air bonding treatment is carried out through hot airflow II so that the lower surface of the multilayer composite film can absorb heat to be softened and be bonded with the adjacently-bonded polytetrafluoroethylene film; 5, the tension is adjusted; 6, winding output is carried out. The high-flux thick polytetrafluoroethylene film is high in porosity and good in gas permeability and covers non-woven filter felt to be manufactured into a filter material, the filter efficiency on fine particles in high-temperature flue gas is high, and the service life of a high-temperature filter material can be prolonged.

Description

technical field [0001] The invention relates to a high-flux thick polytetrafluoroethylene membrane and a preparation method thereof. Background technique [0002] PTFE has excellent thermal stability, its melting point is 327°C, its decomposition temperature exceeds 400°C, and it can work for a long time in the range of -196°C to 260°C; it has a relatively high viscosity coefficient of about 10 10 ~10 12 Pa·S, no viscous flow even above the melting point; outstanding chemical corrosion resistance, insoluble in any solvent except its own fluoride and molten alkali metal; at the same time, low surface free energy and low friction coefficient (0.04 ), has excellent self-cleaning properties, and is an ideal material for preparing high-temperature flue gas filter materials. At present, the high-temperature flue gas filter material is a composite material composed of non-woven filter felt and polytetrafluoroethylene membrane. During the filtration process, the high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00
Inventor 薛刚张建军郑淑琴陈迎妹
Owner 上海灵氟隆新材料科技有限公司
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