Method for preparing hydrophobic microporous membrane and membrane prepared by method
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A microporous membrane and hydrophobic technology is applied in the field of preparation of hydrophobic microporous membranes to achieve the effects of good thermal stability, good retention effect and excellent performance.
Inactive Publication Date: 2011-11-02
TIANJIN UNIV OF SCI & TECH
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[0003] The preparation technology of hydrophobic microporous membranes with high separation performance is the key to restricting the application and industrialization of membrane distillation technology. From the aspects of membrane preparation method selection, chemical stability and cost, PVDF and PP are two materials used in the research and development of membrane distillation membranes. In order to improve the hydrophobic performance and membrane distillation performance of the membrane, some progress has been made in the research and development of the copolymer membrane. However, when the two are used alone as raw materials for membrane preparation, the prepared membrane has some shortcomings, which needs to be improved. Develop membranes with better performance
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Embodiment 1
[0036] A method for preparing a hydrophobic microporous membrane, the steps are as follows:
[0037] (1) Add polypropylene (iPP) granules and high-density polyethylene (HDPE) granules, diluent soybean oil and nucleating agent adipic acid into a four-necked flask, nitrogen as a protective gas, at a temperature of 190°C to 200°C, and stir Heat the casting solution until it becomes a homogeneous solution, and the optimum heating time is 6 hours to obtain the casting solution;
[0038] Among them, the mass ratio of iPP / HDPE is 6:1, and the weight percent of each raw material is: the sum of iPP / HDPE is 30wt.%, the nucleating agent is 0.5wt.%, and the diluent is 69.5wt.%.
[0039] (2) The casting liquid system is degassed under 0.02MPa, and the best time is 2h;
[0040] (3) Preheat the scraper, scraper, and sampler in an oven at a temperature of 210°C to 220°C;
[0041] (4) Use a sampler to move 10g to 15g of the casting solution to the scraper, and use a scraper to quickly scrape...
Embodiment 2
[0046] A method for preparing a hydrophobic microporous membrane, the steps are as follows:
[0047] (1) Add polypropylene (iPP) particles and high-density polyethylene (HDPE) particles, diluents are esters or liquid paraffin and nucleating agent adipic acid in a four-necked flask, nitrogen is used as a protective gas, and the temperature is 190 ℃~200℃, stir and heat the casting solution until it becomes a homogeneous solution, and the best heating time is 5h~8h to obtain the casting solution;
[0048] Among them, the mass ratio of iPP / HDPE is 4:1~7:1, the weight percentage of each raw material is: the sum of iPP / HDPE is 25wt.%~38wt.%, adipic acid is 0.5wt.%, soybean oil is supplemented to 100%.
[0049] (2) The casting liquid system is degassed under 0.02MPa, and the degassing time is 2h to 4h;
[0050] (3) Preheat the scraper, scraper, and sampler in an oven at a temperature of 210°C to 220°C;
[0051] (4) Use a sampler to move 10g to 15g of the casting solution to the sc...
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Abstract
The invention relates to a method for preparing hydrophobic microporous membrane and a membrane prepared by the method. The method comprises the following step of successfully preparing an ethylene-propylene copolymerization hydrophobic microporous membrane from polypropylene (iPP) and high-density polyethylene (HDPE) serving as membrane materials by taking soybean oil as a diluting agent, adipic acid as a nucleating agent and normal hexane as an extracting agent through a titerless infected-cells preservation and scale-up (TIPS) method. The invention develops a high-efficiency membrane preparing process, which comprises the following steps of: ensuring that the temperature of casting solution is between 190 and 200 DEG C, controlling the scraper temperature to be about 210DEG C, and ensuring that the temperature of a quenching water bath is 20DEG C; and determining that a flat membrane forming mass ratio of the polypropylene to the polyethylene is 4:1-7:1 and the optimal membrane forming mass ratio is 6:1, and determining that the concentration range of the copolymer for membrane formation is 25 to 38 weight percent on the basis. The method is suitable for preparing flat membranes, hollow fibrous membranes, tubular membranes and the like; and the prepared membranes have the advantages of high hydrophobic property, low price, good performance and high chemical stability.
Description
technical field [0001] The invention belongs to the technical field of membranes, and relates to the preparation of iPP / HDPE copolymerized hydrophobic microporous membranes by using a thermally induced phase separation (TIPS) method, which is a method for preparing hydrophobic microporous membranes and the membrane prepared by the method. Background technique [0002] Thermally Induced Phase Separation (TIPS), as a porous membrane preparation technology, is suitable for various polymer membrane materials, especially for the preparation of high-performance polyolefin membranes. force. The industrialized production of polyolefin membranes can greatly reduce the cost of membrane modules, improve the overall performance of membranes, and promote the large-scale application of membrane technology in the national economy. The successful development and industrialization of high temperature and strong corrosion resistant membranes can effectively broaden the scope of Application f...
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