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A kind of cellulose-based composite material for ammonia gas detection and preparation method thereof

A composite material, cellulose-based technology, applied in the field of cellulose-based composite material for ammonia detection and its preparation, can solve problems such as low percolation value, and achieve reduced permeation value, high reusability, and high sensitivity Effect

Active Publication Date: 2016-03-02
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Gas-sensing materials based on synthetic polymers have low percolation values, thus having good electrical conductivity and good mechanical properties, while gas-sensing conductive composite materials based on natural cellulose have rarely been reported.

Method used

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  • A kind of cellulose-based composite material for ammonia gas detection and preparation method thereof
  • A kind of cellulose-based composite material for ammonia gas detection and preparation method thereof
  • A kind of cellulose-based composite material for ammonia gas detection and preparation method thereof

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Embodiment Construction

[0024] The implementation of the present invention will be further described below in conjunction with examples and accompanying drawings, but the implementation and protection of the present invention are not limited thereto.

[0025] The proportioning ratio table 1 of embodiment 1~4, its preparation method concrete steps are as follows:

[0026] ① Carbon nanotubes (diameter 2nm, length 15μm, specific surface area 700m 2 / g, with a purity of 95%), heated to reflux at 120°C for 4 hours with concentrated nitric acid, and then placed in a sodium dodecylsulfonate-ethanol (sodium dodecylsulfonate mass fraction: 4%) solution at 70°C Heat and stir for 90 minutes, and finally wash with distilled water until neutral and put it in a desiccator for later use;

[0027] ②Put 1g of ionic liquid in a test tube, add 0.02g of cotton fiber according to the calculated amount (take 1 / 10 each time, add in batches), blow in nitrogen and heat and stir in an oil bath at a temperature of 100°C;

[...

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Abstract

The invention relates to a cellulose based composite material for ammonia detection and a preparation method of the cellulose based composite material. The composite material comprises a natural cellulose base and a powdered conductive stuffing; cotton fibers are taken as a base body, a macromolecular chain of the base body contains a great deal of hydroxyl radicals which are easily combined with polar ammonia gas to form hydrogen bonds, so that the composite material disclosed by the invention has the gas sensing property of strongly responding to ammonia gas. The composite material disclosed by the invention is formed by utilizing the natural cellulose fibers as the base body which is compounded with the conductive stuffing, and the resistance of the composite material can be changed quickly when ammonia gas exists. The finished products of the composite material are non-toxic and tasteless, and cannot pollute the environment. The composite material disclosed by the invention also has high reliability and reusability, and can provide base material for manufacturing gas sensitive components and parts for ammonia detection.

Description

technical field [0001] The invention relates to the technical field of conductive polymer composite materials, in particular to a cellulose-based composite material for ammonia gas detection and a preparation method thereof. Background technique [0002] The gas-sensitive conductive polymer composite material composed of conductive fillers (such as carbon nanotubes, etc.) filled with cellulose matrix has adjustable conductivity in a wide range, easy molding and processing, low cost and responsiveness to ammonia gas advanced features. Its working principle is: the composite material is placed in ammonia gas, and the gas quickly enters the material and can form hydrogen bonds with cellulose, causing the hydrogen bonds between cellulose and carbon nanotubes to be destroyed and replaced by Cellulose and ammonia form intermolecular hydrogen bonds, so that the interaction between carbon nanotubes and cellulose is greatly weakened, and the aggregation of carbon nanotube particles ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08K9/02C08K9/04C08K7/00C08K3/04
Inventor 李军荣刘凯华何北海陈政
Owner SOUTH CHINA UNIV OF TECH
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