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Polytetrafluoroethylene membrane with supporting materials and preparation method thereof

A technology of polytetrafluoroethylene membrane and polytetrafluoroethylene, which is applied in the field of polytetrafluoroethylene hollow fiber membrane and its preparation, can solve problems such as difficult flow and poor processing performance, and achieve increased membrane area, low cost, and easy filling high density effect

Active Publication Date: 2012-03-28
ZHEJIANG CREATION ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of polytetrafluoroethylene is that there is no suitable solvent to dissolve it, and it is difficult to flow even if it is heated to the decomposition temperature. Therefore, the "insoluble and non-meltable" characteristics of polytetrafluoroethylene make its processing performance very poor
At present, the main method of preparing polytetrafluoroethylene microporous membrane is the biaxial stretching method, that is, the polytetrafluoroethylene resin is preformed into a film, sintered and then biaxially stretched to form a microporous membrane with a cracked pore structure. There are few reports on the method of preparing film from polytetrafluoroethylene dispersion emulsion

Method used

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  • Polytetrafluoroethylene membrane with supporting materials and preparation method thereof
  • Polytetrafluoroethylene membrane with supporting materials and preparation method thereof
  • Polytetrafluoroethylene membrane with supporting materials and preparation method thereof

Examples

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preparation example Construction

[0020] The steps of the preparation method of the polyethersulfone membrane with supporting material are as follows:

[0021] 1) Polytetrafluoroethylene concentrated dispersion emulsion with a concentration of 15-40 wt / v %, film-forming carrier polyvinyl alcohol with a concentration of 5-35 wt / v %, and inorganic fine powder with a concentration of 8-25 wt / v % Silicon dioxide, a viscosity regulator boric acid with a concentration of 0.03-0.06 wt / v%, and a defoamer with a concentration of 0.01-0.05 wt / v% are sequentially added to the melting pot, and the stirring shaft seal bar of the melting pot is opened. After fully stirring at 80-100°C for 15-24 hours, the casting solution is obtained;

[0022] 2) Squeeze the casting solution into the tubular hollow fiber spinning spinneret. At the spinning speed of 15-40m / min, the casting solution is extruded by air pressure, filtered through the filter and metering pump into the spinneret for casting. Membrane liquid enters the hole, and ...

Embodiment 1

[0025] 1) Polytetrafluoroethylene concentrated dispersion emulsion with a concentration of 15 wt / v%, film-forming carrier polyvinyl alcohol with a concentration of 5 wt / v%, and inorganic micropowdered silica with a concentration of 8 wt / v%. Add 0.03 wt / v % viscosity regulator boric acid and 0.01 wt / v % tributyl phosphate to the melting pot in sequence, open the sealing bar of the stirring shaft of the melting pot, and fully stir at 80°C for 15 hours to obtain Casting solution;

[0026] 2) Squeeze the casting solution into the tubular hollow fiber spinning spinneret. At a spinning speed of 15m / min, the casting solution is extruded by air pressure, filtered through the filter and metering pump into the spinneret casting solution Enter the hole, and the monofilament fiber entering the spinneret from the monofilament fiber entering hole and the deionized water in the core liquid entering the hole are compounded and formed in the spinneret, and then walk vertically 5cm downward in ...

Embodiment 2

[0029] 1) Polytetrafluoroethylene concentrated dispersion emulsion with a concentration of 40 wt / v %, film-forming carrier polyvinyl alcohol with a concentration of 35 wt / v %, and inorganic micropowder silica with a concentration of 25 wt / v %. Add 0.06 wt / v % viscosity modifier boric acid and 0.05 wt / v % polydimethylsilane into the melting pot in sequence, open the stirring shaft sealing bar of the melting pot, and stir fully at 100°C for 24 hours, Obtain casting solution;

[0030] 2) Squeeze the casting solution into the tubular hollow fiber spinning spinneret. At the spinning speed of 40m / min, the casting solution is extruded by air pressure, filtered through the filter and metering pump into the spinneret casting solution Enter the hole, and the monofilament fiber entering the spinneret from the monofilament fiber entering hole and the deionized water in the core liquid entering the hole are compounded and formed in the spinneret, and then walk vertically 60cm downward in t...

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Abstract

The invention discloses a polytetrafluoroethylene hollow fibrous membrane with supporting materials and a preparation method thereof. The preparation method is characterized by comprising the following steps: taking polyvinyl alcohol as a membrane forming carrier, silica as an inorganic additive, boric acid as a viscosity regulator and tributyl phosphate or polydimethylsilane as a defoamer to prepare a polytetrafluoroethylene hollow fibrous membrane by a dry-wet method, ensuring monofilaments to enter into a spinneret via other inlets and carrying out blending to prepare the polytetrafluoroethylene hollow fibrous composite membrane with the supporting materials, wherein the monofilament fibrous materials are polyester, spandex or polyurethane and have diameter of 0.01-2mm. The membrane and the preparation method have the following beneficial effects: the defect that the hollow fibrous membranes without supports have insufficient physical tensile strength and are easy to suffer from filament break is overcome; the physical tensile strength of the membrane disclosed by the invention is improved by more than several times compared with that of the hollow fibrous membranes without supports; support and membrane stripping can be avoided; the water flux and manufacturing cost of the membrane disclosed by the invention are equivalent to the water flux and manufacturing cost of the hollow fibers without supports; and the membrane has technical and economic breakthroughs, can replace the existing hollow fiber products and has great economic and social benefits.

Description

technical field [0001] The invention relates to composite materials, in particular to a polytetrafluoroethylene hollow fiber membrane with supporting materials and a preparation method thereof. Background technique [0002] PTFE has extremely good chemical stability, strong acid resistance, strong alkali resistance, corrosion resistance to various chemical products, and wide temperature resistance. Therefore, in a special separation environment, PTFE is an ideal separation filter material. The surface tension of PTFE is (22-33)×10 3 N / m, excellent hydrophobicity makes it the material of choice for membrane distillation and waterproof and breathable materials. However, the disadvantage of polytetrafluoroethylene is that there is no suitable solvent to dissolve it, and it is difficult to flow even if it is heated to the decomposition temperature. Therefore, the "insoluble and non-meltable" characteristics of polytetrafluoroethylene make its processing performance very poor....

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D71/36B01D67/00
Inventor 包进峰张星星李芸芳赵辉杨佳
Owner ZHEJIANG CREATION ENVIRONMENT TECH
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