Alkali-resistant ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and alkali-resistant technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Prevent bacterial growth, good resistance to contamination and chemical attack, improve production quality

Inactive Publication Date: 2021-04-02
山东水发优膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing preparation methods of alkali-resistant ultrafiltration membranes cannot guarantee that bacteria will not grow in clean areas. Once bacteria are produced, they will multiply in large numbers. Moreover, alkali-resistant ultrafiltrati

Method used

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  • Alkali-resistant ultrafiltration membrane and preparation method thereof
  • Alkali-resistant ultrafiltration membrane and preparation method thereof
  • Alkali-resistant ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] An alkali-resistant ultrafiltration membrane, comprising the following raw materials in proportions by weight:

[0043] Polyvinyl chloride: 20 parts;

[0044] Polyvinylidene fluoride: 10 parts;

[0045] Additives: 5 parts;

[0046] Solvent: 70 parts.

[0047] The above-mentioned alkali-resistant ultrafiltration membrane and a preparation method thereof comprise the following steps:

[0048] Step 1, pretreating the membrane-making raw material;

[0049] Step 2, mixing the prepared raw materials with an organic solvent to obtain a casting solution;

[0050] S1, defoaming: the casting solution is placed in a defoaming tank, stirred for 1 hour at a temperature of 70°C, and left to stand for 24 hours after mixing evenly.

[0051] S2. Preparing fibrils: sending the fully defoamed mixed solution into the spinning machine, extruding with a spinneret to form hollow fibrils, and standing;

[0052] S3. After part of the solvent in the fibril evaporates, immerse in a 2% glyceri...

Embodiment 2

[0069] The difference between embodiment two and implementation one is:

[0070] An alkali-resistant ultrafiltration membrane, comprising the following components in parts by weight:

[0071] Polyvinyl chloride: 25 parts;

[0072] Polyvinylidene fluoride: 15 parts;

[0073] Additives: 10 parts;

[0074] Solvent: 80 parts.

[0075] In this embodiment, the fully dissolved casting solution needs to be degassed at a temperature of 50-100° C. for 5-9 hours.

[0076] In this example, the coating speed of the casting solution on the non-woven fabric is between 1 and 8 m / s

[0077] In this embodiment, polyvinyl chloride and polyvinylidene fluoride are mixed according to the formula amount, additives are added, and the mixed solution is heated to 70° C. to dissolve until the casting solution is uniform and transparent.

[0078] Others are the same as embodiment one.

Embodiment 3

[0080] Embodiment three is different from implementation one in that:

[0081] An alkali-resistant ultrafiltration membrane, comprising the following components in parts by weight:

[0082] Polyvinyl chloride: 15 parts;

[0083] Polyvinylidene fluoride: 5 parts;

[0084] Additives: 5 parts;

[0085] Solvent: 60 parts.

[0086] In this embodiment, the fully dissolved casting solution needs to be degassed at a temperature of 40-100°C for 5-8 hours.

[0087] In this example, the coating speed of the casting solution on the non-woven fabric is between 1 and 8 m / s

[0088] In this embodiment, polyvinyl chloride and polyvinylidene fluoride are mixed according to the formula amount, additives are added, and the mixed solution is heated to 50° C. to dissolve until the casting solution is uniform and transparent.

[0089] Others are the same as embodiment one.

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Abstract

The invention discloses an alkali-resistant ultrafiltration membrane and a preparation method thereof. The alkali-resistant ultrafiltration membrane is prepared from, by weight, 5-30 parts of polyvinyl chloride, 1-20 parts of polyvinylidene fluoride, 0-20 parts of an additive and 30-95 parts of a solvent. The preparation method of the alkali-resistant ultrafiltration membrane comprises the following steps of: pre-treating membrane preparation raw materials; mixing the prepared raw materials with an organic solvent to obtain a membrane casting solution; putting the membrane casting solution into a defoaming tank for defoaming, feeding the fully defoamed mixed solution into a spinning machine, extruding by using a spinning nozzle to form hollow fibrils, and after part of solvent in the fibrils is evaporated, soaking the fibrils into a 2% glycerol solution coagulating bath for soaking and forming. The alkali-resistant ultrafiltration membrane provided by the invention has excellent chemical stability, acid and alkali resistance, electrolysis resistance, good strength and flexibility and very strong anti-pollution capability, the service life of the alkali-resistant ultrafiltration membrane is prolonged by the preparation method provided by the invention, and the hydrophilicity of the alkali-resistant ultrafiltration membrane is effectively prevented from losing effect due to drying when being placed in air.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an alkali-resistant ultrafiltration membrane and a preparation method thereof. Background technique [0002] In the past two or three years, the ultrafiltration membrane has doubled and entered a critical period of development. With the development of industry, water pollution is becoming more and more serious, and the requirements for water pretreatment are getting higher and higher. More and more companies choose to use it. ultrafiltration membrane for pretreatment. [0003] The existing preparation methods of alkali-resistant ultrafiltration membranes cannot guarantee that bacteria will not grow in clean areas. Once bacteria are produced, they will multiply in large numbers. Moreover, alkali-resistant ultrafiltration membranes are hydrophilic and will dry out when placed in the air. It loses its effect due to melting, and when the alkali-resistant ultrafiltration me...

Claims

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Application Information

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IPC IPC(8): B01D71/30B01D67/00B01D69/08
CPCB01D71/30B01D67/0013B01D67/0011B01D69/08
Inventor 徐正强曹行春姚付江李丕成李娜李学勤张政王兆霖
Owner 山东水发优膜科技有限公司
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