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Method for preparing polyvinylidene fluoride hollow fiber microporous film by microscopic phase separating method

A technology of polyvinylidene fluoride and phase separation, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc. It can solve the problems of microporous membrane method without patent reports, etc., and achieves membrane production process and is easy to operate , small amount required, and easy-to-obtain raw materials

Inactive Publication Date: 2006-08-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are no patent reports on the method of preparing microporous membranes using microscopic phase separation behavior

Method used

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  • Method for preparing polyvinylidene fluoride hollow fiber microporous film by microscopic phase separating method
  • Method for preparing polyvinylidene fluoride hollow fiber microporous film by microscopic phase separating method
  • Method for preparing polyvinylidene fluoride hollow fiber microporous film by microscopic phase separating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Polyvinylidene fluoride (Zhejiang Lantian Environmental Protection High-tech Co., Ltd., melt index 3.0g / 10min) and cellulose diacetate (Wuxi Chemical Research and Design Institute) were melt-blended at 200°C, and the weight percentage of cellulose diacetate The content is 0.03%, and granulated. Then the blended pellets are fed into a spinning machine, and the hollow fiber membrane is prepared through a melt spinning-stretching process. The spinning conditions are as follows: the hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, nitrogen is fed into the central air supply pipe, and the pressure is 30 mm of water column. The spinning temperature of the spinneret was 215°C. The winding speed of the hollow fiber was 100 m / min, and the draft ratio was 1100. The prepared hollow fiber wound filaments were heat-treated at 125°C for 24h, and then stretched directly. The stretching conditions were: stretching at 90° C. at a stretching rate of 3 cm / min...

Embodiment 2

[0049] Polyvinylidene fluoride (Zhejiang Lantian Environmental Protection High-tech Co., Ltd., melt index 3.0g / 10min) and cellulose acetate-butyrate (Wuxi Chemical Research and Design Institute) were melt-blended at 210°C, and cellulose acetate-butyrate The weight percentage is 0.03%, and granulated. Then the blended pellets are fed into a spinning machine, and the hollow fiber membrane is prepared through a melt spinning-stretching process. The spinning conditions are as follows: the hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, the central air supply pipe is fed with nitrogen, and the pressure is 33 mm of water column. The spinning temperature of the spinneret was 216°C. The winding speed of the hollow fiber was 140 m / min, and the draft ratio was 1500. The prepared hollow fiber wound filaments were heat-treated at 135°C for 12h, and then stretched directly. The stretching conditions were: stretching at 90° C. at a stretching rate of 4 cm / min,...

Embodiment 3

[0052] Polyvinylidene fluoride (Zhejiang Lantian Environmental Protection High-tech Co., Ltd., melt index 3.0g / 10min) and hydroxymethyl cellulose (Wuxi Chemical Research and Design Institute) were melt blended at 215 ° C, the weight of hydroxymethyl cellulose The percentage content is 0.04%, and granulated. Then the blended pellets are fed into a spinning machine, and the hollow fiber membrane is prepared through a melt spinning-stretching process. The spinning conditions are as follows: the hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, the central air supply pipe is fed with nitrogen, and the pressure is 35 mm of water column. The spinning temperature of the spinneret was 224°C. The winding speed of the hollow fiber was 140 m / min, and the draft ratio was 1500. The prepared hollow fiber wound filaments were heat-treated at 140°C for 12h, and then stretched directly. Stretching conditions were: stretching at 90° C. at a stretching rate of 3 cm / m...

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Abstract

The present invention is micro phase separating process of preparing hollow microporous polyvinylidene fluoride fiber film. The present invention features that some hydrophilic matter with relatively high surface energy and polyvinylidene fluoride are molten and mixed, and the mixture is prepared into the hollow microporous polyvinylidene fluoride fiber film through melting spinning and stretching. The hollow microporous polyvinylidene fluoride fiber film features the improved hydrophobic property, contact angle lowering by over 20 deg, tensile break strength of 100-150 MPa, elongation at breaking of 150-400 %, porosity of 30-70 %, average pore size of 0.01-0.2 micron, air penetrability of 0.0001-0.1 cu cm / sq cm.s.cmHg, film inner diameter of 150-400 micron and wall thickness of 30-60 micron.

Description

technical field [0001] The invention relates to a method for preparing a polyvinylidene fluoride hollow fiber microporous membrane by using a microscopic phase separation method. Background technique [0002] Polyvinylidene fluoride (PVDF) is a membrane material with excellent performance, which has been widely used in various fields such as membrane separation, chemical industry, environmental protection, and medical treatment. [0003] The polyvinylidene fluoride hollow fiber microporous membrane was first prepared mainly by the solution phase inversion method. In Chinese Patent Nos.95117497 and 98103153, the preparation of polyvinylidene fluoride hollow fiber microporous membrane by wet method and dry-wet spinning technology is introduced in detail. The biggest disadvantage of this film-making process is that a large amount of solvent is needed, which has certain pollution to the environment, and the prepared film must be stored in a solvent, which is inconvenient for tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08
Inventor 徐又一杜春慧朱宝库
Owner ZHEJIANG UNIV
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