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Polyvinylidene fluoride hollow fiber porous membrane and preparation method thereof

A technology of polyvinylidene fluoride and porous membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low strength, high membrane manufacturing cost, uneven pore size, etc., and achieve large surface area, Excellent adsorption, small specific gravity effect

Active Publication Date: 2010-03-17
QINGDAO SEACON WATER SERVICE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of polyvinylidene fluoride hollow fiber porous membrane with low water permeability, non-uniform pore size and low strength, and propose a composition of solid organic powder sugar compound as pore forming agent and casting liquid It is polyvinylidene fluoride, strong polar solvent and powdery sugar compound, and solid pore-forming agent is added in the polymer solution, makes solvent improve the solubility of polymer and prepares porous film; Another purpose of the present invention is to overcome The thermally induced phase separation method has the disadvantages of complex process and high membrane manufacturing cost. It provides a method that follows the existing gel phase inversion hollow fiber porous membrane manufacturing process and increases the dispersion and filtration process of powdery sugar compounds in the solvent. The process of internally removing sugar compounds and the environmental protection process of recovering waste solvents in the coagulation water bath realize large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-13

[0021] This embodiment uses the following method and ingredients and devices to prepare hollow fiber polyvinylidene fluoride (PVDF) microporous membranes, as shown in Table 1, with lactose, polycellobioside, α-L, 4-cyclodextrin, β-L, 4-cyclodextrin, γ-L, 4-cyclodextrin, cyclodextrin mixture, xylan hemicellulose, soluble starch, amylose, β-amylase, pullulan, glycogen, powdered cellulose as The effect of the porogen compared with the polyvinylidene fluoride film without the porogen added, the porogen used has a weight average molecular weight of 200 to 1,000,000.

[0022] A. Weigh 20 grams each of the above 13 kinds of powdered sugar compounds, set up another blank, add 40 grams of dimethyl sulfoxide respectively, stir at room temperature for one hour, vacuum filter with 2 μ glass fiber filter cloth, use 40 Continue to the next step after rinsing the filter cloth with 1 gram of dimethyl sulfoxide to make the filter cloth residue less than 1 gram;

[0023] B. Add 20 grams of pol...

Embodiment 14-17

[0031] Taking the same composition of pore-forming agent, the polyvinylidene fluoride hollow fiber casting solution was prepared according to different amounts. As shown in Table 2, the water permeability increased correspondingly with the increase of the amount of pore-forming agent, while the separation rate decreased accordingly.

[0032] A. Take by weighing 10 grams of amylose (molecular weight 12000-60000), 15 grams, 20 grams, 25 grams and add 75 grams of methylpyrrolidone respectively, 25 grams of polyvinylidene fluoride with a molecular weight of 300,000, the same as in Example 1-13 Method prepares casting solution;

[0033] B. prepare hollow fiber membrane and hydrolyzed membrane product by the same condition of embodiment 1-13, obtain outer surface not glossy, slightly rough, outer diameter 2.1-2.2MM inner diameter 1.3-1.4MM hollow fiber membrane;

[0034] C. All measured by internal pressure, water temperature 25 ℃.

[0035] Table 2: List of parameters of Examples 1...

Embodiment 18-21

[0038] Take pore-forming agents with the same composition and different molecular weights, and prepare polyvinylidene fluoride hollow fiber casting solution according to the method of Example 1-13. The results shown in Table 3 are obtained according to the following steps:

[0039] A. Take respectively 18 grams of amylose with a molecular weight of 100,000, 300,000, 400,000, and 600,000, add 82 grams of dimethylacetamide and 18 grams of polyvinylidene fluoride with a molecular weight of 150,000, and prepare a cast film in the same manner as in Examples 1-13 liquid;

[0040] B. prepare hollow fiber membrane and hydrolyzed membrane product by the same condition of embodiment 1-13, membrane outer diameter 2.2MM, internal diameter 1.4MM;

[0041] C. Measured by internal pressure, the water temperature is 25°C.

[0042] Table 3: Experimental results of Examples 18-21.

[0043] Example

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Abstract

The invention belongs to the technical field of polymer material preparation, relating to an increased polyvinylidene fluoride hollow fiber porous membrane and a preparation method thereof. The preparation method comprises the following steps: dispersing powdery saccharide compounds in organic solvent first and dissolving polyvinylidene fluoride with the solvent to form casting film polymer solution; and preparing a hollow fiber by a gelling phase inversion method; retaining powdery materials in a solid while using a precipitated medium to solidify polymer, and dissolving a saccharide powderymaterial by a hydrolysis method to retain a micropore structure; and controlling the molecular weight of powdery saccharide compounds and the size and quantity of powder particles to obtain films withdifferent apertures and porosity factors. The formula of polymer solution comprises the following components in percentage by weight: 15-30 percent of polyvinylidene fluoride, 40-75 percent of organic solvent and 10-30 percent of powdery saccharide compounds; and the invention has simple and easily-controllable process steps, reasonable film pore size, excellent film structure, favorable performance and low preparation cost and is suitable for industrial production.

Description

Technical field: [0001] The invention belongs to the technical field of polymer material preparation, and relates to an organic hollow fiber porous membrane and a preparation method thereof, in particular to a polyvinylidene fluoride-added hollow fiber porous membrane and a preparation method thereof. Background technique: [0002] Polyvinylidene fluoride microfiltration and ultrafiltration membranes have basic characteristics such as high thermal stability, strong chemical stability, low surface tension and negative charge. Therefore, it has received extensive attention and practical application in natural water purification, municipal sewage treatment, wastewater containing acids, alkalis, oxidants, and process water. In the prior art, about adopting the technology of gel phase inversion method to prepare polyvinylidene fluoride porous membrane, most adopt in polymer solution, add liquid non-solvent, as polyethylene glycol, polyvinyl alcohol, glycerin, propylene glycol et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08
Inventor 王英崔春卫
Owner QINGDAO SEACON WATER SERVICE TECH
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