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Preparation method of humidity-sensitive sensing film

A technology of sensing film and moisture sensitivity, which is applied in the field of preparation of moisture sensitive sensing film, can solve problems such as poor humidity sensitivity, insufficient environmental protection of materials, and easy peeling off of moisture sensitive film, so as to improve humidity sensitivity, Easy film formation and low substitution effect

Active Publication Date: 2019-05-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the shortcomings of the humidity sensitive film in the prior art, such as easy to fall off, prone to hysteresis, poor humidity sensitivity, and insufficient environmental protection of materials, the present invention provides a method for preparing a humidity sensitive sensing film

Method used

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  • Preparation method of humidity-sensitive sensing film
  • Preparation method of humidity-sensitive sensing film
  • Preparation method of humidity-sensitive sensing film

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Effect test

Embodiment 1

[0025] The preparation method of embodiment 1 water-soluble cellulose acetate

[0026] Take 1.8mL of valeryl chloride and slowly add it dropwise to 30g of ionic liquid 1-ethyl-3-methylimidazolium acetate, take 1.00g of cotton linter cellulose and infiltrate it into the above solvent system. Magnetic stirring was carried out to obtain a transparent, viscous and completely dissolved cellulose solution, and under the condition of continuous magnetic stirring, the reaction was kept at 70°C for 12 hours. After the reaction, the system was poured into 200ml of ethanol to terminate the reaction, and then repeatedly washed with a large amount of ethanol and filtered until the ionic liquid and unreacted reagents were cleaned to obtain a pure cellulose product, which was verified to be soluble in water.

Embodiment 2

[0037] The preparation method of embodiment 2 moisture-sensitive sensing film

[0038] S 1 1. Take 1.8mL of valeryl chloride and slowly add it dropwise to 30g of ionic liquid 1-ethyl-3-methylimidazole acetate, take 1.00g of linter cellulose and infiltrate it into the above solvent system. Under magnetic stirring, a transparent, viscous, and completely dissolved cellulose solution was obtained. Under the condition of continuous magnetic stirring, the reaction was maintained at 70° C. for 12 hours. After the reaction, pour the system into 200ml of ethanol to terminate the reaction, then repeatedly wash and filter with a large amount of ethanol until the ionic liquid and unreacted reagents are cleaned to obtain a pure cellulose acetate product;

[0039] S 2 1. Take a certain mass of WSCA to prepare 10mL of a 1% aqueous solution, weigh 0.0025g of rGO to prepare a 0.25mg / mL aqueous solution, add the graphene aqueous solution to the prepared WSCA solution, and perform ultrasonic t...

Embodiment 3

[0047] The preparation method of embodiment 3 moisture-sensitive sensing film

[0048] S 1 1. Take 1.5mL of valeryl chloride and slowly add it dropwise to 30g of ionic liquid 1-ethyl-3-methylimidazolium acetate, take 0.6g of woody cellulose and intrude into the above solvent system, under the condition of 63℃ oil bath Magnetic stirring was carried out to obtain a transparent, viscous, and completely dissolved cellulose solution. Under the condition of continuous magnetic stirring, the reaction temperature was maintained for 9 hours. After the reaction, pour the system into 200ml of ethanol to terminate the reaction, then repeatedly wash and filter with a large amount of ethanol until the ionic liquid and unreacted reagents are cleaned to obtain a pure cellulose acetate product;

[0049] S 2 1. Take a certain mass of WSCA to prepare 20mL of a 0.5% aqueous solution, weigh 0.0005g of rGO to prepare a 0.25mg / mL aqueous solution, add the graphene aqueous solution to the prepared ...

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Abstract

The invention relates to humidity-sensitive sensing films and discloses a preparation method of the humidity-sensitive sensing film. The preparation method comprises the following steps: taking valeryl chloride as a modifier; carrying out modification treatment on cellulose in an ionic liquid solution, i.e., 1-ethyl-3-methyl-methylimidazole acetate, so as to prepare water-soluble cellulose acetateWSCA; preparing the water-soluble cellulose acetate to a cellulose water solution; preparing graphene oxide into a solution and adding the solution into the cellulose water solution, so as to obtaina cellulose / graphene oxide uniform mixed solution; adding a reduction reagent into the cellulose / graphene oxide mixed solution and treating an obtained reduced graphene oxide / cellulose water solutionto obtain a flexible rGO / WSCA humidity-sensitive sensing film. The humidity-sensitive film provided by the invention has the advantages of uneasiness of falling off, no hysteresis phenomenon, relatively good humidity sensitivity, environment-friendly material and the like.

Description

technical field [0001] The invention relates to a moisture sensitive sensing film, in particular to a preparation method of the moisture sensitive sensing film. Background technique [0002] Humidity, a physical quantity indicating the dryness of the atmosphere, is closely related to human survival and social activities. With the continuous advancement of modernization, it is difficult to find a field that is completely unrelated to humidity. The measurement and control of humidity plays an important role in many fields such as industrial and agricultural production, food production and storage, aerospace, medical equipment and so on. As a result, various instruments and equipment for monitoring humidity have emerged as the times require, and humidity detection and control are carried out in many areas of production and life. Traditional hygrometers and humidity-sensitive materials have problems such as moisture-sensitive defects, complex manufacturing processes, and high c...

Claims

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Application Information

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IPC IPC(8): C08L1/12C08K3/04C08J5/18C08B3/06G01N27/30
Inventor 逄锦慧李露于世涛刘毓祥
Owner QINGDAO UNIV OF SCI & TECH
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