Hollow hydrophobic fiber membrane and preparation method thereof

A technology of hydrophobic membrane and fiber, applied in the field of hollow fiber hydrophobic membrane and its preparation, can solve the problems of low recovery efficiency, low hydrophobicity of hollow fiber membrane, easy to be wetted, etc., and achieve the effect of convenient operation and simple membrane forming process

Active Publication Date: 2014-01-08
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hollow fiber membranes used in the membrane distillation process are less hydrophobic and tend to be easily wetted during use, resulting in shortened use time and low recovery efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix the dried 10% nano-calcium carbonate and 15% polyvinylidene fluoride evenly with a high-speed mixer, then add them to 60% dimethylacetamide under stirring conditions, and then add 10% acetamide Glycol and 5% adipic acid are stirred and dissolved evenly, and after defoaming, the casting solution is made.

[0022] The above-mentioned casting solution is spun through a spinneret under the action of a metering pump, and the inner and outer coagulation baths are deionized water at 60°C, and the as-spun silk is obtained after the gelation is completed. The resulting as-spun silk was rinsed in ethanol at 60°C for 24 hours, and then dried at 70°C to obtain a polyvinylidene fluoride hollow fiber hydrophobic membrane. The outer diameter of the obtained hollow fiber hydrophobic membrane was 1.2 mm, the inner diameter was 0.7 mm, and the contact angle was 135 degrees.

Embodiment 2

[0024] Mix the dried 5% nanoclay and 17% polyvinylidene fluoride evenly with a high-speed mixer, then add them to 60% dimethylformamide under stirring conditions, and then add 15% diethylene difluoride Alcohol and 3% sodium succinate, stir and dissolve evenly, and after defoaming, make a casting solution.

[0025] The above-mentioned casting solution is spun through a spinneret under the action of a metering pump, and the inner and outer coagulation baths are deionized water at 40°C, and the as-spun silk is obtained after the gelation is completed. The resulting as-spun silk was rinsed in ethanol at 30°C for 24 hours, and then dried at 50°C to obtain a polyvinylidene fluoride hollow fiber hydrophobic membrane. The obtained hollow fiber hydrophobic membrane had an outer diameter of 1.2 mm, an inner diameter of 0.7 mm, and a contact angle of 121 degrees.

Embodiment 3

[0027] Mix the dried 15% nano-silica and 13% polyvinylidene fluoride evenly with a high-speed mixer, then add them to 66% dimethyl sulfoxide under stirring conditions, and then add 5% glycerin , 1% sodium glutarate, stirred and dissolved evenly, after defoaming, made into casting solution.

[0028] The above-mentioned casting solution is spun through a spinneret under the action of a metering pump, and the inner and outer coagulation baths are deionized water at 50°C, and the as-spun silk is obtained after the gelation is completed. The resulting as-spun silk was rinsed in ethanol at 10°C for 24 hours, and then dried at 30°C to obtain a polyvinylidene fluoride hollow fiber hydrophobic membrane. The obtained hollow fiber hydrophobic membrane had an outer diameter of 1.2 mm, an inner diameter of 0.7 mm, and a contact angle of 95 degrees.

[0029] In the present invention, inorganic nanoparticles and organic liquid nucleating agents are added to the casting liquid, and the phase...

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Abstract

The invention discloses a hollow hydrophobic fiber membrane and a preparation method thereof, and provides a hollow hydrophobic fiber membrane with good hydrophobic performance and a preparation method thereof. The hydrophobic membrane comprises, by mass, 13-17% of polymers, 5-15% of inorganic nanoparticle nucleating agents, 1-5% of organic liquid nucleating agents, 60-66% of organic solvent and 5-15% of pore-forming additives. The preparation method includes evenly mixing the dried inorganic nanoparticle nucleating agents and the dried polymers at a high speed, evenly dispersing in the organic solvent while stirring, adding the pore-forming additives and organic liquid nucleating agents, mixing evenly and removing bubbles to obtain required membrane casting liquor, extruding the membrane casting liquor by a spinning jet, subjecting the membrane casting liquor to a coagulating bath at the temperature of 40-60 DEG C, fully rinsing in ethyl alcohol at the temperature of 10-60 DEG C after freezing, and drying at the temperature of 30-70 DEG C to obtain the hollow hydrophobic fiber membrane. During membrane forming, polyvinylidene fluoride forms crystalline structures in different sizes, so that high hydrophobization of the hollow hydrophobic fiber membrane is realized.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a hollow fiber hydrophobic membrane and a preparation method thereof. Background technique [0002] Membrane distillation is a liquid separation technology that combines the traditional distillation process with membrane separation technology. The membrane distillation process is that the water molecules of the hot side liquid evaporate and vaporize, pass through the micropores of the hydrophobic membrane, and the non-volatile ions and molecules in the water phase The solute cannot pass through the hydrophobic membrane, so as to achieve the purpose of solution separation, concentration or purification. Membrane distillation is a membrane process with phase change, in which heat and mass transfer occur simultaneously, and the driving force of mass transfer is the difference in vapor partial pressure between the components on both sides of the hydrophobic membrane. [0003] The ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 胡晓宇李洪港孙文挺
Owner TIANJIN MOTIMO MEMBRANE TECH
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