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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] After the dried 10% nano calcium carbonate and 15% polyvinylidene fluoride are mixed uniformly with a high-speed mixer, they are added to 60% dimethylacetamide under stirring conditions, and then 10% ethylene Glycol and 5% adipic acid, stir and dissolve uniformly, after degassing, make a casting liquid.

[0022] The above casting liquid is spun through a spinneret under the action of a metering pump, and the inner and outer coagulation baths are both 60°C deionized water, and the nascent silk is obtained after the gel is completed. After the obtained spun silk is rinsed in ethanol at 60°C for 24 hours, and dried at 70°C, a polyvinylidene fluoride hollow fiber hydrophobic membrane is obtained. The resulting hollow fiber hydrophobic membrane has an outer diameter of 1.2 mm, an inner diameter of 0.7 mm, and a contact angle of 135 degrees.

Example Embodiment

[0023] Example 2

[0024] After the dried 5% nanoclay and 17% polyvinylidene fluoride are mixed uniformly with a high-speed mixer, they are added to 60% dimethylformamide under agitation, and then 15% diethylenedialdehyde is added. Alcohol and 3% sodium succinate are stirred and dissolved evenly, and after deaeration, it is made into a casting liquid.

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

Example Embodiment

[0026] Example 3

[0027] After the dried 15% nano-silica and 13% polyvinylidene fluoride are mixed uniformly with a high-speed mixer, they are added to 66% dimethyl sulfoxide under stirring conditions, and then 5% glycerin is added , 1% sodium glutarate, stir and dissolve evenly, and after degassing, make a casting liquid.

[0028] The above-mentioned casting liquid is spun through a spinneret under the action of a metering pump, and the inner and outer coagulation baths are both 50°C deionized water, and the nascent silk is obtained after the gel is completed. After the obtained spun silk is rinsed in ethanol at 10°C for 24 hours, and dried at 30°C, a polyvinylidene fluoride hollow fiber hydrophobic membrane is obtained. The resulting hollow fiber hydrophobic membrane has 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 nano particles and organic liquid nucleating agent are added to the film ...

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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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