Method for preparing free-standing film by using salt solution

A self-supporting, salt solution technology, applied in the field of preparing self-supporting membranes using salt solution, can solve the problems of complex preparation process, difficulty in fast film formation, and long time consumption, and achieve the effect of easy-to-obtain raw materials, fast preparation speed and simple process

Active Publication Date: 2019-02-01
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many ways to make self-supporting membranes, among which the sacrificial layer method is the most widely used, but the preparation process of this method is relatively complicated, which is restricted by the choice of sacrificial layer and pre-preparation.
Although the process of preparing a self-supporting film by the auxiliary method is relatively simple, it has high requirements on the surface properties of the substrate, the mechanical properties of the auxiliary layer and the target coating, and is not universal.
In addition to the sacrificial layer method and the auxiliary method, the method of dissolving the substrate is the most direct method for preparing multilayer self-supporting films. Method to prepare the type of self-supporting membrane
In these methods for preparing self-supporting membranes, self-supporting membranes are not easy to form films quickly, and the formed self-supporting membranes are often damaged during the separation process between the membrane and the substrate, making the membranes difficult to peel off, increasing the amount of engineering and capital investment, and making the output low. time consuming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 A method for preparing a self-supporting membrane using a salt solution, the emulsion is PVAc, and the salt solution is a saturated NaCl solution.

[0019] (1) Preparation of PVAc emulsion

[0020] At room temperature, first dissolve 0.08 g of KPS in 8 mL of deionized water to prepare a KPS solution for later use. Put 3g of PVA and 27g of deionized water in a four-port reactor, heat and dissolve at 90°C to obtain a PVA solution, then add 12mL of deionized water, 0.8mL of OP-10, and 0.25g to the above PVA solution in sequence SDS, 2mL of KPS solution, 5mL of VAc, reflux and stir in a water bath at 70°C for 1h. Then, 27 mL of VAc and 6 mL of KPS solution were alternately added to the reaction solution, and the addition was completed dropwise within 2 h. Next, the temperature was raised to 90° C. and cooled to 50° C. after reacting until there was no reflux. Adjust the pH to 5. Finally, 9g of DBP was added and reacted for 30min. A PVAc emulsion is prepare...

Embodiment 2

[0025] Example 2 A method for preparing a self-supporting membrane using a salt solution, the emulsion is 906, and the salt solution is a saturated NaCl solution.

[0026] (1) Treatment of the substrate

[0027] The glass substrate was first wiped with absolute ethanol, and then rinsed with deionized water and dried for later use.

[0028] (2) Preparation of self-supporting membrane

[0029] At room temperature, the surface-treated substrate was soaked in 906 emulsion, saturated NaCl solution and deionized water for 1s, 30s, and 60s in sequence, and then mechanically peeled off with a blade in deionized water to obtain a self- support membrane.

Embodiment 3

[0030] Example 3 A method for preparing a self-supporting membrane using a salt solution, the emulsion is 906, and the salt solution is a saturated NaCl solution.

[0031] (1) Treatment of the substrate

[0032] The glass substrate was first wiped with absolute ethanol, and then rinsed with deionized water and dried for later use.

[0033] (2) Preparation of self-supporting membrane

[0034] At room temperature, the surface-treated substrate was soaked in 906 emulsion, saturated NaCl solution and deionized water for 1800s, 60s and 60s in sequence, and then mechanically peeled off with a blade in deionized water to obtain a self- support membrane.

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PUM

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Abstract

The invention discloses a method for preparing a free-standing film by using a salt solution. The prepared free-standing film has a controllable thickness. The method comprises the following steps: processing a substrate, and preparing the free-standing film. The prepared free-standing film is simply mechanically peeled from water to rapidly prepare the free-standing film. The method has the advantages of simple technology, high film production efficiency and environmentally-friendly process, and the free-standing film can be widely applied to fields of medicines, industries and environmentalprotection.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and in particular relates to a method for preparing a self-supporting membrane by using a salt solution. Background technique [0002] With the development of science and technology, the requirements for membrane materials in various fields of production and life are getting higher and higher. In recent years, due to the advantages of simple preparation, high transparency, certain universality, and not being bound by the substrate, self-supporting films have become a research hotspot. Self-supporting membranes can be used to produce separation membranes and smart components with different surface functions. At present, there are many ways to make self-supporting membranes, among which the sacrificial layer method is the most widely used, but the preparation process of this method is relatively complicated, which is restricted by the selection and pre-preparation of the sacrificial l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/00C08L31/04C08J5/18
CPCC08J5/18C08J2331/04C08J2333/00
Inventor 张健夫屈栎杭王博伦常路平申若辰
Owner CHANGCHUN UNIV OF SCI & TECH
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