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Supported hydrophilic polyvinylidene fluoride microporous membrane and preparation method thereof

The technology of polyvinylidene fluoride and polyvinylidene fluoride resin is applied in the field of supported hydrophilic polyvinylidene fluoride microporous membrane and its preparation, which can solve the problems of shortening the service life of the membrane, adsorption pollution, large driving force, etc. Achieve stable product performance, uniform membrane pore size distribution, better filtration accuracy and filtration efficiency

Active Publication Date: 2015-06-03
上海一鸣过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strong hydrophobicity of the material itself leads to two problems: one is that the separation process requires a large driving force; the other is that it is easy to generate adsorption pollution and shorten the service life of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a supported hydrophilic polyvinylidene fluoride microporous membrane, the method comprising the following steps:

[0027] 1) Casting solution formula: Dissolve 56 grams of polyvinylidene fluoride resin with a molecular weight of 320,000, 3 grams of hydrophilic components, and 10 grams of polyvinylpyrrolidone in 331 grams of dimethylacetamide at 70°C to form a casting solution . The casting solution was left to defoam for about 24 hours.

[0028] 2) Phase inversion film formation: cast the casting solution at a temperature of 40°C onto the support layer, scrape the support layer soaked with the casting solution with a scraper, the gap between the scraper and the support layer is 20 μm, and at a relative humidity After standing in 100% air for 100 seconds, it was taken out after passing through the first coagulation bath, the second coagulation bath and the third coagulation bath in sequence, and the hydrophilic microporous membrane was obtained af...

Embodiment 2

[0035] A method for preparing a supported hydrophilic polyvinylidene fluoride microporous membrane, the method comprising the following steps:

[0036] 1) Casting liquid formula: 66 grams of polyvinylidene fluoride resin with a molecular weight of 320,000, 4 grams of hydrophilic components, 10 grams of polyvinylpyrrolidone, and 15 grams of polyethylene glycol (Mw400) were dissolved in 305 at 70 ° C. gram of dimethylacetamide to become the casting solution. The casting solution was left to defoam for about 24 hours.

[0037] 2) Phase inversion film formation: cast the casting solution at a temperature of 40°C onto the support layer, and scrape the support layer soaked with the casting solution with a scraper. The gap between the scraper and the support layer is 30 μm. After standing in 80% air for 100 seconds, it was taken out after passing through the first coagulation bath, the second coagulation bath and the third coagulation bath in sequence, and the hydrophilic microporou...

Embodiment 3

[0044] A method for preparing a supported hydrophilic polyvinylidene fluoride microporous membrane, the method comprising the following steps:

[0045] 1) Casting liquid formula: dissolve 78 grams of polyvinylidene fluoride resin with a weight average molecular weight of 320,000, 4 grams of hydrophilic components, 8 grams of polyvinylpyrrolidone, and 20 grams of polyethylene glycol (Mw400) at 70 ° C. Become casting solution in 300 grams of dimethylacetamide. The casting solution was left to defoam for about 24 hours.

[0046] 2) Phase inversion film formation: cast the casting solution at a temperature of 40°C onto the support layer, and scrape the support layer soaked with the casting solution with a scraper. The gap between the scraper and the support layer is 30 μm. After standing in 80% air for 80 seconds, it was taken out after passing through the first coagulation bath, the second coagulation bath and the third coagulation bath in sequence, and the hydrophilic microporo...

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PUM

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Abstract

The invention relates to a supported hydrophilic polyvinylidene fluoride microporous membrane and a preparation method thereof. The pore size of the microporous membrane is 0.1-20 mu m, and the thickness of the microporous membrane is 90-200 mu m. The method comprises the following steps: 1)the preparation of a casting membrane solution, dissolving a polyvinylidene fluoride resin in a solvent firstly, adding hydrophilic components and an additive, and at temperature of 30-80 DEG C, fully stirring the obtained mixture so as to form the uniform and stable casting membrane solution; and 2) membrane formation by phase inversion: casting the casting membrane solution on a support layer, carrying out membrane wiping on the support layer saturating in the casting membrane solution by using a scraper under the condition that a gap between the scraper and the support layer is 15-40 mu m, standing for 10-400 seconds in the air, and after a membrane sequentially passes through a first coagulation bath, a second coagulation bath and a third coagulation bath, taking out the membrane, and drying the membrane,,and then the hydrophilic microporous membrane is obtained. Compared with the prior art, the membrane disclosed by the invention has the advantages of thorough extraction, uniform pore size distribution, better filtering accuracy and filtering efficiency, capability of being applied to continuous mass production, stable product performances, and the like.

Description

technical field [0001] The invention relates to high-end membrane application fields such as food, beverage, biochemical pharmacy, medical care and sanitation, and in particular to a supported hydrophilic polyvinylidene fluoride microporous membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride is a semi-crystalline polymer with excellent performance. Due to the short C-F bond length and strong bond energy (486KJ / mol) of polyvinylidene fluoride, it has excellent mechanical properties (good impact strength, good toughness, high hardness, good wear resistance, creep resistance, etc.), and at the same time It also has good chemical stability (it is not corroded by acids, alkalis, strong oxidants and halogens at room temperature, and organic solvents such as aliphatic hydrocarbons, alcohols, and aldehydes have no effect on it). However, the strong hydrophobicity of the material itself leads to two problems: one is that the separation pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 杨刘韩家心龚志宏卢忠宝王鑫
Owner 上海一鸣过滤技术有限公司
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