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Hollow fiber ultrafiltration membrane of polysulfone with permanent hydrophilicity and its preparing process

An ultrafiltration membrane, hydrophilic technology, applied in the field of polymer membrane and its manufacturing, can solve the problem of not seeing, and achieve the effect of shortening the reaction time

Inactive Publication Date: 2006-06-28
上海蓝景膜技术工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, we have not seen similar products produced in our country, nor have we seen any published articles and reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] In the ordinary spinning solution composed of 18% polysulfone (domestic or BASF production, intrinsic viscosity 0.58 ~ 0.6), 10% polyethylene glycol (PEG400) and 72% dimethylformamide, add 4% K-15 / K-30 in a ratio of 2:1, under normal operating conditions, used for wet spinning to obtain a hollow fiber membrane with an inner diameter of 0.9 mm and a wall thickness of 0.25 mm. , take it out after washing for 4 hours, control the moisture and place it in a tubular high-pressure reactor, which contains 0.1% concentration of K 2 S 2 o 8 solution, heating the reactor so that the water temperature quickly reaches 110°C, and then cooling down after 20 minutes of heat preservation. After the water temperature drops below 50°C, open the reactor to take out the fiber filaments, dry them in an oven at 105°C for 8 hours. Direct rehydration, the pure water flux measured at a membrane penetration pressure of 0.1MPa is 250l / m 2 .h.

Embodiment 2

[0012] Change the polysulfone content from 18% to 16% in the spinning solution, the ratio of K-15 / K-30 is from 2:1 to 1:3, and the rest are the same as in Example 1. After the dry membrane is directly rehydrated, it is measured that the pure water flux is 310l / m at a membrane penetration pressure of 0.1MPa 2 h.

Embodiment 3

[0014] The percentage by weight of the mixture of K-15 / K-30 added in the spinning solution is increased from 4% to 6%, and the ratio of K-15 / K-30 is changed from 2:1 to 3:1, and the others are the same Example 1. After the dry membrane is directly rehydrated, it is measured that the pure water flux is 200l / m at a membrane penetration pressure of 0.1MPa 2 .h.

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Abstract

The present invention relates to one kind of permanent hydrophilic hollow polysulfone fiber ultrafiltering film and its making process, and features that into the conventional formula of hollow polysulfone fiber ultrafiltering film, mixture of PVP K-15 and PVP K-30 in the ratio of 1 / 3 to 3 is added, and hollow polysulfone fiber ultrafiltering film of 0.7-2.0 mm inner diameter is made through dry and wet spinning process, soaking and washing in water for 4 hr, and set in tubular high pressure reactor containing oxidant for PVP to be oxidized and cross-linked fully. The film is then dried in an oven at 105 deg.c for over 8 hr, taken out and cooled to room temperature to become permanent hydrophilic hollow polysulfone fiber ultrafiltering film. The present invention may find its wide application in city water processing, medicine extraction and purification, etc.

Description

1. Technical field: [0001] The invention relates to a polymer membrane and a manufacturing method thereof, in particular to a polysulfone hollow fiber ultrafiltration membrane with permanent hydrophilicity and a manufacturing method thereof. 2. Background technology: [0002] Polysulfone has good physical and chemical properties. The hollow fiber ultrafiltration membrane prepared by it not only has good water permeability and separation characteristics, but also has good mechanical strength, acid and alkali resistance, heat resistance, bacteria and microbial erosion, Chemical resistance, anti-oxidation and other excellent properties, is one of the commonly used membrane materials. The only shortcoming is its strong hydrophobicity, and the contact angle with water reaches 74.5°-77.0°, which seriously limits its application. People try to modify it, some try to sulfonate it, bring -OS 3 - Negatively charged groups, some make it quaternized, with -NH 3 + Positively charged...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/08
Inventor 刘寿山祝振鑫周国云
Owner 上海蓝景膜技术工程有限公司
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