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Preparation method of PTFE/PFA composite membrane high in porosity

A high-porosity, composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of thin thickness, unfavorable lamination, low strength, etc., achieve simple process, improve gloss, good stability

Inactive Publication Date: 2019-04-16
浙江净膜环保有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to ensure that the filtration resistance in the dust removal device is always at a low level and the treatment air flow rate is kept at a high level, it is necessary to prepare a PTFE membrane with low resistance and high filtration rate, which has high porosity but thin thickness and low strength. , not conducive to lamination with other materials

Method used

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  • Preparation method of PTFE/PFA composite membrane high in porosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Blending: Stir and mix PTFE resin, PFA resin (10% of the mass of PTFE resin) and additive oil (28% of the total mass of PTFE resin and PFA resin) at room temperature, and mix them in a constant temperature oven at 50°C Aging for more than 24 hours to form a PTFE / PFA mixture;

[0028] Blank making: pressing the matured PTFE / PFA mixed material into a columnar blank on a compactor;

[0029] Extrusion: Extrude the shape into a stick at a temperature of 50°C through an extruder and place it in a water bath at 45°C for 5 minutes;

[0030] Calendering: the rod is rolled into a PTFE / PFA base tape with a width of 19 cm and a thickness of 200 μm through a calender at 50°C;

[0031] Drying: Dry the PTFE / PFA base tape in an oven at 180°C to remove additive oil;

[0032] Longitudinal stretching and transverse stretching: the PTFE / PFA base tape is stretched longitudinally at a temperature of 220°C, with a stretching ratio of 14B, processed to prepare a degreased base tape, and then...

Embodiment 2

[0036] 1. Blending: Stir and mix PTFE resin, PFA resin (20% of the mass of PTFE resin) and additive oil (28% of the total mass of PTFE resin and PFA resin) at room temperature, and mix them at a constant temperature of 50°C Mature in an oven for more than 24 hours to form a PTFE / PFA mixture;

[0037] 2. Blank making: the matured PTFE / PFA mixture is pressed into a columnar blank on a compactor;

[0038] 3. Extrusion: Extrude the billet into a rod at a temperature of 50°C through an extruder and place it in a water bath at 45°C for 5 minutes;

[0039] 4. Calendering: the rod is rolled into a PTFE / PFA base tape with a width of 19 cm and a thickness of 200 μm through a calender at 50°C;

[0040] 5. Drying: Dry the PTFE / PFA base tape in an oven at 180°C to remove the additive oil;

[0041] 6. Longitudinal stretching and transverse stretching: the PTFE / PFA base tape is stretched longitudinally at a temperature of 220°C, with a stretching ratio of 14B, processed to prepare a degrea...

Embodiment 3

[0045] 1. Blending: Stir and mix PTFE resin, PFA resin (30% of the mass of PTFE resin) and additive oil (28% of the total mass of PTFE resin and PFA resin) at room temperature, and mix them at a constant temperature of 50°C Mature in an oven for more than 24 hours to form a PTFE / PFA mixture;

[0046] 2. Blank making: the matured PTFE / PFA mixture is pressed into a columnar blank on a compactor;

[0047] 3. Extrusion: Extrude the billet into a rod at a temperature of 50°C through an extruder and place it in a water bath at 45°C for 5 minutes;

[0048] 4. Calendering: the rod is rolled into a PTFE / PFA base tape with a width of 17 cm and a thickness of 200 μm through a calender at 50°C;

[0049] 5. Drying: Dry the PTFE / PFA base tape in an oven at 180°C to remove the additive oil;

[0050] 6. Longitudinal stretching and transverse stretching: the PTFE / PFA base tape is stretched longitudinally at a temperature of 220°C, with a stretching ratio of 14B, processed to prepare a degrea...

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Abstract

The invention discloses a preparation method of a PTFE / PFA composite membrane high in porosity. PTFE resin, PFA resin with the mass fraction of 0-30% and auxiliary oil are uniformly blended, subjectedto blank preparation, extruded, rolled, dried, subjected to longitudinal stretching and transverse stretching, sintered and shaped. The preparation method is simple, low in cost and suitable for massproduction. The average aperture of micropores of the PTFE / PFA composite membrane is 0.2-8 micron, the porosity is 80-92%, and the resistance is 30-120 Pa at the flow speed of 5.3 cm / s; when gas containing particles with the particle size of 0.1-0.3 micron passes through the membrane, the particle capture efficiency is 90-99.9%. The membrane can be applied to various fields such as industrial dust removal, air filtration and liquid phase filtration.

Description

technical field [0001] The invention relates to a preparation method of a PTFE and PFA composite membrane, in particular to a preparation method of a high-porosity PTFE composite membrane. Background technique [0002] Polytetrafluoroethylene (PTFE) is known as the "King of Plastics" and has many excellent properties. The surface of PTFE film is smooth, non-condensing, easy to clean, and does not change the porosity after cleaning, and its excellent high and low temperature resistance and chemical stability are widely used in the field of dust control. [0003] PFA is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and tetrafluoroethylene. Its performance is very similar to PTFE, and it also has excellent chemical stability, high and low temperature resistance, good molding and processing performance, and creep resistance. Both the compressive strength and compressive strength are better than PTFE and the tensile strength is high. [0004] In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D67/00B01D69/12
CPCB01D67/0002B01D69/12B01D71/32
Inventor 周勇尤健明岳中华鲁扎典王兆光侯小炜
Owner 浙江净膜环保有限责任公司
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