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Self-support PVDF (polyvinylidene fluoride) homogeneous micropore tubular membrane as well as preparation method thereof

A tubular membrane, self-supporting technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane product performance to be improved, high production cost, etc.

Active Publication Date: 2014-07-23
浙江东洋环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN103585892A (2014-2-19) discloses a method for preparing a reinforced hollow fiber membrane by a low-temperature thermal phase method, its product, application and equipment. The method comprehensively adopts a low-temperature thermal phase method and dry-wet spinning to prepare The cost is high, but the performance of membrane products still needs to be improved

Method used

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  • Self-support PVDF (polyvinylidene fluoride) homogeneous micropore tubular membrane as well as preparation method thereof
  • Self-support PVDF (polyvinylidene fluoride) homogeneous micropore tubular membrane as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Film-making solution preparation: mix polyvinylidene fluoride resin, inorganic powder and diluent at 60°C to form a uniform powder; film-making components and proportions are: polyvinylidene fluoride resin 12wt%; diluent 26wt%; the rest is inorganic pink;

[0054] The weight average molecular weight of polyvinylidene fluoride resin is 150,000-180,000 daltons, and the crystallinity is 50%; the specific surface area of ​​inorganic powder is 50-500m 2 / g, average particle size 0.005-0.1??m.

[0055] Inorganic powder is talcum powder;

[0056] The diluent is a co-solvent composed of a weakly acting potential solvent and a strongly acting potential solvent in a mass ratio of 3:1;

[0057] Wherein the potential solvent of weak action is benzyl benzoate, and the potential solvent of strong action is triethyl glycerate and monoethyl glyceride.

[0058] Film making: The film making powder is fed into the film forming unit including twin-screw mixer and melt pump through forc...

Embodiment 2

[0062] Film-making liquid preparation: mix polyvinylidene fluoride resin, inorganic powder and diluent at 85°C to form a uniform powder; the composition and ratio of film-making liquid are: polyvinylidene fluoride resin 24wt%; diluent 15wt%;

[0063] The weight average molecular weight of polyvinylidene fluoride resin is 180,000-200,000 Daltons, and the crystallinity is 55%; the specific surface area of ​​inorganic powder is 50-500m 2 / g, average particle size 0.1-0.2??m.

[0064] The rest is inorganic powder;

[0065] The inorganic powders are bentonite and kaolin.

[0066] The diluent is a co-solvent composed of a weakly acting potential solvent and a strongly acting potential solvent in a mass ratio of 4.5:1;

[0067] Wherein the potential solvent with weak action is dibutyl sebacate, and the potential solvent with strong action is diethyl glycerate.

[0068] Film making: The film making powder is fed into the film forming unit including twin-screw mixer and melt pump th...

Embodiment 3

[0072] Preparation of film-making powder: mix polyvinylidene fluoride resin, inorganic powder and diluent at 60-85°C to form a uniform powder; the composition and proportion of film-making liquid are: polyvinylidene fluoride resin 18wt%; diluent 20wt %;

[0073] The weight average molecular weight of polyvinylidene fluoride resin is 220,000-230,000 daltons, and the crystallinity is 60%; the specific surface area of ​​inorganic powder is 50-500m 2 / g, average particle size 0.3-0.5??m;

[0074] The inorganic powder is calcium carbonate, talc, bentonite, kaolin or silica powder.

[0075] The diluent is a co-solvent composed of a weakly acting potential solvent and a strongly acting potential solvent in a mass ratio of 4:1;

[0076] Wherein the potential solvent of weak action is dibutyl sebacate, and the potential solvent of strong action is benzophenone.

[0077]Film making: The film making powder is fed into the film forming unit including twin-screw mixer and melt pump thro...

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Abstract

The invention discloses a self-support PVDF (polyvinylidene fluoride) homogeneous micropore tubular membrane as well as a preparation method thereof, relates to a method for preparing a PVDF homogeneous tubular membrane by a thermally induced phase separation method, and belongs to the field of PVDF micropore membrane preparation. The membrane is an externally pressed self-support tubular membrane with the inner diameter range of 4-25mm, and has a uniform three-dimensional network framework structure; the three-dimensional network framework structure of the tubular membrane at least comprises an alloy material of PVDF and inorganic powder. The preparation method comprises the following steps: mixing materials, dissolving PVDF resin, inorganic powder and diluents so as to prepare powder for preparing the membrane, wherein a membrane preparation liquid comprises 12-24wt% of PVDF resin, 15-26wt% of the diluents and the balance of organic powder and additives; adding the powder for membrane preparation into a membrane preparation and molding machine set by forced feeding, and extruding into a tubular nascent state membrane; controlling the specific value of the spinning nozzle extruding dosage to the tubular membrane traction velocity to be 0.15-0.35 of the external diameter cross section of an extruded membrane tube; cooling the tubular nascent state membrane so as to form a tubular membrane; treating after membrane formation. The self-support PVDF homogeneous micropore tubular membrane is reduced in cost, and is uniform in thickness.

Description

technical field [0001] The invention relates to a method for preparing a PVDF homogeneous tubular membrane by a heat-induced phase separation method, and belongs to the field of PVDF microporous membrane preparation. Background technique [0002] Thermally Induced Phase Separation (TIPS) is a method developed and matured in recent years to prepare polymer microporous membranes. The research on the thermally induced phase separation method began in the 1970s. A.J.Castro made a comprehensive report on the preparation of polymer porous membranes by the TIPS method in US Patent No. 4,247,498 (1980). He pointed out that many thermoplastic and crystalline high molecular polymers and some small molecular compounds (diluents) with high boiling points can form a homogeneous solution at high temperature (generally higher than the melting point Tm of the polymer), which occurs when the temperature is lowered. Solid-liquid or liquid-liquid phase separation, and then remove the diluent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/04B01D67/00
Inventor 周钱华沈海军
Owner 浙江东洋环境科技有限公司
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