Novel preparation method of high-performance composite film

A composite membrane, high-performance technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced mechanical properties of membrane materials, a large amount of organic solvents, and difficulty in scraping and coating to form molds. Simple equipment and convenient operation

Inactive Publication Date: 2016-01-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method controls the pore structure of the membrane, the operation is complicated and requires a large amount of organic solvent
For most membrane materials, increasing the concentration of the casting solution is the main method to reduce the pore si

Method used

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  • Novel preparation method of high-performance composite film
  • Novel preparation method of high-performance composite film

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] (1) Add 3g of fully dried polyvinylidene fluoride to 92g of dimethylacetamide, stir and dissolve at 50℃ for 2h, add 5g of anhydrous lithium chloride after the polymer is completely dissolved, continue to stir to complete Dissolve to obtain a homogeneous solution, stand for 30 minutes to degas, and set aside;

[0022] (2) Put the degassed solution obtained in step (1) in a constant pressure propeller, and set the advancing speed to 100mL / h. Using the solution spray method, adjust the spray distance to 5cm and the rotating roller speed to 10r / min , The feed temperature is 25℃, the atomization pressure is 1.5MPa, and the air flow is 160mL / h. The casting liquid is sprayed on the polyester nonwoven fabric fixed on the surface of the roller. The roller is rotated while the solution is sprayed. The lower part is immersed in tap water in the coagulation bath for 10 hours, and then transferred to pure water for rinsing for 48 hours. During the rinsing process, the...

Example Embodiment

[0024] Example 2

[0025] (1) Add 10g of fully dried polyvinylidene fluoride to 85g of dimethylacetamide, stir and dissolve at 80℃ for 3h, add 5g of anhydrous lithium chloride after the polymer is completely dissolved, continue to stir to complete Dissolve to obtain a homogeneous solution, stand for 5h to degas, and set aside;

[0026] (2) Put the degassed solution obtained in step (1) in a constant pressure pusher, set the advancing speed to 400mL / h, adopt the method of solution spraying, adjust the spraying distance to 10cm and the rotating roller speed to 15r / min , The feed temperature is 50℃, the atomization pressure is 2.5MPa, and the air flow is 200mL / h. The casting liquid is sprayed on the polypropylene non-woven fabric fixed on the surface of the roller, and the roller is rotated while the solution is sprayed. The lower part is immersed in the tap water of the coagulation bath. After the spraying is completed, remove the non-woven fabric and immerse it in the tap water of ...

Example Embodiment

[0028] Example 3

[0029] (1) Add 10 g of bisphenol A polysulfone to 85 g of nitrogen methyl pyrrolidone, stir and dissolve at 80°C for 3 hours. After the polymer is completely dissolved, add 5 g of calcium chloride and continue to stir until it is completely dissolved. Phase solution, degas in a vacuum drying oven for 1 hour, set aside;

[0030] (2) Put the degassed solution obtained in step (1) in a constant pressure propeller, and set the advancing speed to 300mL / h. Using the solution spray method, adjust the spray distance to 15cm and the rotating roller speed to 30r / min , The feed temperature is 50 ℃, the atomization pressure is 1.5 MPa, the air flow is 140 mL / h, the casting liquid is sprayed on the polyester non-woven fabric fixed on the surface of the roller, and the roller is rotated while the solution is sprayed. The lower part is immersed in the coagulation bath absolute ethanol. After spraying, the non-woven fabric is removed, and the non-woven fabric is immersed in the...

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Abstract

The present invention provides a novel preparation method of a high-performance and high-strength composite film. The preparation method comprises: a) dissolving an organic polymer film preparing material in an organic solvent to obtain a homogeneous solution, adding a certain amount of an additive, uniformly mixing, and carrying out standing deaeration to obtain a film casting solution; and 2) placing the film casting solution in a constant pressure propeller, and spraying the film casting solution on a nonwoven fabric fixed on the surface of a rotation roller in a spray-coating manner by using a solution injection method while rotating the rotation roller, wherein the lower half portion of the rotation roller is immersed in the coagulation bath, and the constant pressure propeller speed, the injection distance, the rotation roller speed, the material feeding temperature, the atomizing pressure, and the air flow rate parameter are controlled to control the pore size and the distribution of the film so as to obtain the high-performance and high-strength fiber composite film. According to the present invention, the method has characteristics of simple preparation process, easy operation, low equipment requirements, energy saving and low cost, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a high-performance, high-strength composite membrane, in particular to a high-strength composite fiber membrane with an adjustable pore diameter and a sponge-like structure obtained by a solution spraying method. Background technique [0002] Membrane separation technology, as a new type of efficient fluid separation unit operation technology, has the functions of separation, concentration, purification and refining, as well as high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control, etc. In recent years, It has achieved remarkable rapid development, and it is widely used in industrial fields such as the manufacture of sterile water, high-purity water or beverages, and air purification. Moreover, in recent years, it has also been widely used in the fields of domestic wastewater and industrial wastewater. At present, the membrane...

Claims

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Application Information

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IPC IPC(8): B01D71/12B01D69/12B01D67/00
Inventor 李伟袁晓雨黄睿张兴祥
Owner TIANJIN POLYTECHNIC UNIV
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