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A kind of chitosan/lithium chloride mixed film and its preparation method and application

A technology of chitosan and lithium chloride, applied in chemical instruments and methods, separation methods, membrane technology and other directions, can solve problems such as limitations, and achieve the effects of convenient operation, simple process and avoiding energy consumption

Inactive Publication Date: 2015-09-09
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the limitations and defects of the traditional dehumidification method for air dehumidification

Method used

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  • A kind of chitosan/lithium chloride mixed film and its preparation method and application
  • A kind of chitosan/lithium chloride mixed film and its preparation method and application
  • A kind of chitosan/lithium chloride mixed film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Use an electronic balance to accurately weigh 2g of chitosan with a deacetylation degree of not less than 90%, add it to 1% (v / v) acetic acid aqueous solution, and make a chitosan film casting solution with a total mass of 100g, Use a magnetic stirrer to stir at a constant speed at room temperature to obtain a fully dissolved chitosan solution.

[0029] (2) Use a Buchner funnel with two layers of filter paper to suction filter the completely dissolved chitosan casting solution, and remove the tiny insoluble matter still remaining in the solution by filtration;

[0030] (3) Use the combined method of standing still and vacuuming to remove air bubbles from the impurity-removed chitosan casting solution, and finally ensure that the chitosan casting solution is in the form of no bubbles under a negative atmospheric pressure;

[0031] (4) Cast the chitosan film casting solution obtained through the above steps on the film casting plate to form a uniform thickness and dry...

Embodiment 2

[0047] (1) Use an electronic balance to accurately weigh 2g of chitosan with a deacetylation degree of not less than 90% and a certain mass of lithium chloride (the mass ratio of chitosan and lithium chloride is 20:1), add to 1% ( In the acetic acid aqueous solution of v / v), be made into the chitosan / lithium chloride mixed film casting solution that total mass is 100g, use magnetic stirrer to carry out uniform stirring at room temperature, get the chitosan / lithium chloride that dissolves completely Casting solution.

[0048] (2) Use a Buchner funnel with two layers of filter paper to filter the completely dissolved chitosan / lithium chloride casting film solution, and remove the tiny insoluble matter still remaining in the solution by filtration;

[0049] (3) Debubble the impurity-removed chitosan / lithium chloride casting film solution by using a combination of standing and vacuuming, and finally ensure that the solution is in the form of no bubbles under a negative atmospheric...

Embodiment 3

[0066] (1) Use an electronic balance to accurately weigh 2g of chitosan with a deacetylation degree of not less than 90% and 0.2g of lithium chloride (mass ratio of chitosan and lithium chloride is 10:1), add to 1% (v In the acetic acid aqueous solution of / v), be made into the chitosan / lithium chloride mixed casting film solution that total mass is 100g, use magnetic stirrer to carry out constant velocity stirring at room temperature, get the chitosan / lithium chloride cast film that dissolves completely membrane solution.

[0067] (2) Use a Buchner funnel with two layers of filter paper to filter the completely dissolved chitosan / lithium chloride casting film solution, and remove the tiny insoluble matter still remaining in the solution by filtration;

[0068] (3) Debubble the impurity-removed chitosan / lithium chloride casting film solution by using a combination of standing and vacuuming, and finally ensure that the solution is in the form of no bubbles under a negative atmo...

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Abstract

The invention discloses a chitosan / lithium chloride composite membrane, a preparation method and applications thereof. The main components of the composite membrane are chitosan and lithium chloride. In the membrane, through the interaction forces between hydrogen bonds, a compact structure which is formed by drying is enable to have a high separation property, and the dampness eliminating property of chitosan membrane is changed at the same time, wherein the mass ratio of the chitosan to the lithium chloride is 20:1 to 5:2. The invention also discloses a preparation method of the chitosan / lithium chloride composite membrane. The preparation method comprises the following steps: preparing a membrane casting solution, removing insoluble substances in the membrane casting solution, eliminating the bubbles in the membrane casting solution, carrying out a tape casting process, and finally drying so as to obtain the membrane. The prepared chitosan / lithium chloride composite membrane with a proper mass ratio has a better dampness removing property, can be applied to the field of air dampness removing and cooperatively used with a membrane dampness removing technology, overcomes the shortages of large equipment, high energy consumption, and requirement on a regeneration process, and has the advantages of high performance, environment-friendliness, and economic profit.

Description

technical field [0001] The invention relates to a mixed membrane and its preparation method and application, in particular to a preparation method of a chitosan / lithium chloride mixed membrane and its application in air dehumidification. Background technique [0002] Proper humidity control has gradually become a common problem in daily life, specific environment, agricultural production, industrial production, bridge construction and other fields. In daily life, the air humidity needs to be controlled within a certain range. If the relative humidity is too high or too low, it will cause sensory discomfort and even damage human health; It will cause loss to precious paintings, sculptures, documents and mechanical equipment in the place; in southern China, high temperature and high humidity from July to September will cause large-scale greenhouses to stop production, while high humidity in winter will inhibit plant growth and induce pest diseases; Semiconductors, precision i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/08B01D67/00B01D53/22B01D53/26
Inventor 李金龙隋国哲高金强
Owner QIQIHAR UNIVERSITY
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