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Preparation method for polytetrafluoroethylene separating film

A technology of polytetrafluoroethylene and separation membrane, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., and can solve the problems of high processing temperature and mixing of hydrophilic polymers, etc.

Inactive Publication Date: 2013-08-07
吕晓龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the polytetrafluoroethylene (PTFE) material is a non-melting and insoluble plastic material, its processing and forming method is generally a method of high-temperature sintering at a temperature above 320°C. The processing temperature is high, and it is difficult to mix hydrophilicity into the membrane material. Polymer

Method used

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  • Preparation method for polytetrafluoroethylene separating film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 10wt% polyethylene chlorotrifluoroethylene resin ( ECTFE, Halar901, Solvay company), 80wt% PTFE particle (Solvay company, suspension method PTFE, 25 microns), 5wt% nano-calcium carbonate, 5wt% dihexyl phthalate, under high-speed stirring, uniformly disperse, make film composition. The film-forming composition was directly spun at 260° C. using twin-screw extrusion equipment. The cooling bath was tap water at room temperature. At room temperature, the as-spun fiber was stretched 60% twice to remove calcium carbonate and dihexyl phthalate to obtain a hollow fiber separation membrane with an inner diameter of 0.8mm, a thickness of 0.25mm, and a pure water permeation rate of 1900L / m 2 ·h0.1MPa 20℃, membrane separation pore size 0.35μm, porosity 60%, separation membrane surface contact angle 86 degrees.

Embodiment 2

[0033] 5wt% polyethylene chlorotrifluoroethylene resin ( ECTFE, Halar901, Solvay company), 60wt% PTFE particles (Solvay company, suspension method PTFE, 25 microns), 5wt% nano calcium carbonate, 25wt% dihexyl phthalate, 10wt% polyethylene glycol (molecular weight is 20000 ) under high-speed stirring, uniformly dispersed to prepare a film-forming composition. The film-forming composition was directly spun at 180° C. using twin-screw extrusion equipment. The cooling bath was tap water at room temperature. After removing the additives, a hollow fiber separation membrane with an inner diameter of 0.8mm, a thickness of 0.25mm, and a pure water permeation rate of 3900L / m was obtained. 2 ·h0.1MPa20℃, membrane separation pore diameter 0.20μm, porosity 72%, separation membrane surface contact angle 68 degrees.

Embodiment 3

[0035] 5wt% polyethylene chlorotrifluoroethylene resin ( ECTFE, Halar901, Solvay company), 60wt% PTFE particle (Solvay company, suspension method PTFE, 325 microns), 5wt% nano-calcium carbonate, 5wt% dioctyl phthalate, 20wt% triethyl phosphate, 10wt% poly Ethylene glycol (molecular weight: 20,000) is uniformly dispersed under high-speed stirring to prepare a film-forming composition. The film-forming composition was extruded on a plastic film extruder at 180° C. to prepare a flat film. The cooling bath was tap water at room temperature. After removing the additives, a PTFE flat membrane is obtained with a thickness of 0.15mm and a pure water permeation rate of 9300L / m 2 ·h0.1MPa 20℃, membrane separation pore diameter 0.50μm, porosity 71%, separation membrane surface contact angle 67 degrees.

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Abstract

The invention relates to a polytetrafluoroethylene separating film and a preparation method thereof. A film forming compound comprises the components such as polytetrafluoroethylene grains, polyethylene ehlorotrifluoroethylene resins, and the like. Various components of the film forming compound are uniformly mixed or scattered and then a melting processing method is used for processing a film. The polyethylene ehlorotrifluoroethylene resins in the film forming compound are attached to the surfaces of the polytetrafluoroethylene grains and then are solidified, thereby splicing the polytetrafluoroethylene grains and forming a separating film main body. The preparation method provided by the invention is used for overcoming the defects of compact film epidermis, low surface aperture ratio and high processing temperature caused by a sintering process and a thermal phase transfer film-forming process. The polytetrafluoroethylene separating film can be subjected to the extending after-treatment, thereby promoting the flux of the separating film. The acquired polytetrafluoroethylene separating film has low protein adsorbing property and high pollution-resisting property.

Description

technical field [0001] A method for preparing a polytetrafluoroethylene (PTFE) separation membrane involving air purification and liquid separation, suitable for liquid filtration and gas separation and purification in the fields of chemical industry, medicine, food, water purification, textile, metallurgy, mining, environmental protection, etc. . Background technique [0002] Polytetrafluoroethylene (PTFE) material has excellent acid and alkali resistance and pollution resistance. The separation membrane made of PTFE material is widely used in chemical industry, medicine, food, water purification, textile, metallurgy, mining, environmental protection and other fields. Liquid filtration and air filtration have good application prospects. [0003] The commonly used preparation methods of PTFE separation membranes are sintering and stretching methods. For example, the Chinese invention patent CN1102748 provides a polytetrafluoroethylene porous membrane. The polytetrafluoroet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36
Inventor 吕晓龙
Owner 吕晓龙