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Bunchiness hollow fiber film and method of preparing the same

A technology of external pressure hollow fibers and fiber membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Eliminate problems such as peeling damage, achieve high production efficiency and high bonding firmness

Inactive Publication Date: 2008-03-12
胡萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This produces new disadvantages: 1. The outer diameter of the thin tube membrane is larger, and the packing density per unit volume is lower than that of the hollow fiber membrane; 2. The combination of the braided support tube and the porous membrane material is not high. When backwashing after pollution, the braided support tube and the porous membrane material are prone to peeling and damage; 3. When the air oscillation cleaning method is used, the membrane material is prone to fatigue, damage, and peeling at the joint between the thin tube membrane root and the casting resin; 4. Problems such as low production efficiency

Method used

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  • Bunchiness hollow fiber film and method of preparing the same
  • Bunchiness hollow fiber film and method of preparing the same
  • Bunchiness hollow fiber film and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1: 500 grams of calcium carbonate 2 micron particles are stirred at high speed, uniformly dispersed in 5 kilograms of dimethylacetamide solvent, then add 2 kilograms of dimethylacetamide, 2 kilograms of polyvinylidene fluoride resin, 500 grams of polyvinylidene fluoride Ethylene glycol, 100 grams of Tween-20, stir and dissolve evenly, spin after defoaming. The above-mentioned spinning stock solution is passed through the three-strand six-strand nozzle as shown in Figure 5, and enters the coagulation bath together with the six polyester tendon threads to form a clustered hollow fiber membrane. The coagulant is water, the initial modulus of the polyester filament is 20-300cN / dtex, and the linear density of the polyester filament is 100--500dtex. The calcium carbonate in the polyvinylidene fluoride hollow fiber was removed with hydrochloric acid solution, and the obtained external pressure polyvinylidene fluoride hollow fiber porous membrane had an inner diamete...

Embodiment 2

[0062] Example 2: Under high-speed stirring of 500 grams of aluminum oxide 20-80 nanoparticles, uniformly disperse in 7 kilograms of N-methylpyrrolidone solvent, then add 2 kilograms of polyvinylidene fluoride resin, 500 grams of polyvinylpyrrolidone, 100 Gram Tween-80, stir to dissolve evenly, spin after defoaming. The above-mentioned spinning stock solution is put into the coagulation bath together with five strands of polypropylene ribs through the five-filament bundle and five-rib nozzle as shown in Figure 5 to form a clustered hollow fiber membrane. The polypropylene yarn density is 100--500dtex. The coagulant in the coagulation bath is water. The aluminum oxide in the polyvinylidene fluoride hollow fiber was removed by NaOH aqueous solution, and the obtained external pressure polyvinylidene fluoride hollow fiber porous membrane had an inner diameter of 0.6 mm, a wall thickness of 0.15 mm, and a single hollow fiber membrane bundle breaking tension of 11.7 kg. Pure water...

Embodiment 3

[0064] Embodiment 3: 800 grams of calcium carbonate 2 micron particles are stirred at high speed, uniformly dispersed in 5 kilograms of dimethylacetamide solvent, then add 1.8 kilograms of dimethylacetamide, 1.8 kilograms of polyvinylidene fluoride resin, 780 grams of polyvinylidene fluoride Vinylpyrrolidone and 20 grams of fluorosurfactant FC-4 are stirred and dissolved evenly, and spinning after defoaming. The coagulant in the coagulation bath is water. The six hollow fibers are bundled to obtain a bundled hollow fiber membrane. Remove the calcium carbonate in polyvinylidene fluoride hollow fiber with hydrochloric acid solution, and obtain the external pressure polyvinylidene fluoride hollow fiber porous membrane, with an inner diameter of 0.6mm, a wall thickness of 0.15mm, and a rupture strength of 0.43MPa. A single hollow fiber membrane bundle is broken Tension 1.7kg, pure water penetration rate 1210L / m 2 ·h@0.1MPa 20℃, membrane separation pore size 0.50μm.

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Abstract

A bunchy hollow fiber membrane is characterized with the high flexibility and strong tension resistance. An external diameter of a fiber bundle of the fiber membrane is 0.3 to 3 mm. An internal diameter of a single fiber is 0.1 to 1.0 mm, a fiber wall is 0.05 to 1mm, the porosity is 50 t0 90 percent, and a membrane separation pore diameter is 0.01 to 1um. The breaking tension of each hollow fiber membrane bundle is 0.2-25.0kg, and the purified water penetration flux is 600-10000l / m2 per hour at 0.1MPa and 25 centigrade degrees. A multi-pore membrane made with the present invention is provided with the advantage that a narrow-tube membrane is provided with a large external area; compared with a hollow fiber membrane, packing density within a volume unit is not greatly changed; the production efficiency is high; and so on.

Description

technical field [0001] The invention relates to a high-strength porous membrane, that is, a bundle hollow fiber membrane and a preparation method thereof, which can be used to manufacture an external pressure polymer hollow fiber ultrafiltration membrane or a polymer hollow fiber microporous membrane. Background technique [0002] Hollow fiber membranes are mainly used for filtration and separation in various fields. [0003] The formation mechanism of the solution phase transfer hollow fiber membrane is that the membrane-forming polymer, organic solvent, and pore-forming agent are mixed in a certain proportion, and after being dissolved evenly, they enter the coagulation bath through the spinning nozzle. The solvent and pore-forming agent in the polymer solution enter the coagulant phase, and the polymer precipitates into a polymer hollow fiber membrane due to phase transfer. A hollow fiber separation membrane with a certain pore size can be obtained by controlling the spi...

Claims

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Application Information

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IPC IPC(8): B01D69/08
Inventor 胡萍
Owner 胡萍
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