Preparation method of high-temperature-resistant gas-sensitive material

A gas-sensitive material and high-temperature-resistant technology, which is applied in the direction of analyzing materials, analyzing gas mixtures, measuring devices, etc., can solve problems such as easy to be decomposed, unstable molecular structure, and high-temperature resistance of gas-sensitive materials, so as to enhance molecular stability , the degree of roughness enhancement, the effect of strengthening the internal cross-linking structure

Pending Publication Date: 2019-09-06
谭俊鸿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a high-temperature-resistant gas-sensitive material in view of the defects that the current gas-sensitive material is not resistant to high temperature and its molecular structure is unstable and easy to be decomposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Preparation of the reaction product:

[0029] In terms of parts by weight, weigh 3 parts of corn stalks, 6 parts of corn leaves and 1 part of rice husk and put them into a planetary ball mill for mixing and grinding to obtain a mixture. Put the mixture and 10% hydrochloric acid in a mass ratio of 1:3 into a beaker , the beaker was placed in an ultrasonic oscillator and vibrated for 4 hours at a frequency of 35 kHz, filtered after oscillation, and washed with distilled water for 3 times to obtain a reaction product.

[0030] Preparation of reaction solution:

[0031]Put the above reaction product and citric acid solution with a mass fraction of 7% into the reaction kettle at a mass ratio of 1:10, raise the temperature in the kettle to 60°C, and react at a constant temperature for 2 hours. After the reaction, raise the temperature in the kettle to 220°C, Raise to 2.0MPa, react at constant temperature and pressure for 2 hours to prepare a mixed solution, add zinc chloride...

example 2

[0041] Preparation of the reaction product:

[0042] In terms of parts by weight, weigh 4 parts of corn stalks, 7 parts of corn leaves and 2 parts of rice husks and put them into a planetary ball mill for mixing and grinding to obtain a mixture, and put the mixture and 12% hydrochloric acid in a mass ratio of 1:3 into a beaker , the beaker was placed in an ultrasonic oscillator and vibrated for 5 hours at a frequency of 37 kHz, filtered after oscillation, and washed with distilled water for 4 times to obtain a reaction product.

[0043] Preparation of reaction solution:

[0044] Put the above reaction product and citric acid solution with a mass fraction of 9% into the reaction kettle at a mass ratio of 1:10, raise the temperature in the kettle to 65°C, and react at a constant temperature for 3 hours. After the reaction, raise the temperature in the kettle to 230°C, Raise it to 2.1MPa, react at constant temperature and pressure for 3 hours to prepare a mixed solution, add zin...

example 3

[0054] Preparation of the reaction product:

[0055] In terms of parts by weight, weigh 5 parts of corn stalks, 8 parts of corn leaves and 2 parts of rice husks and put them into a planetary ball mill for mixing and grinding to obtain a mixture, and put the mixture and 13% hydrochloric acid into a beaker at a mass ratio of 1:3 , the beaker was placed in an ultrasonic oscillator and vibrated for 6 hours at a frequency of 38 kHz, filtered after oscillation, and washed 5 times with distilled water to obtain a reaction product.

[0056] Preparation of reaction solution:

[0057] Put the above reaction product and citric acid solution with a mass fraction of 10% into the reaction kettle at a mass ratio of 1:10, raise the temperature in the kettle to 70°C, and react at a constant temperature for 3 hours. After the reaction, raise the temperature in the kettle to 240°C, Raise it to 2.2MPa, react at constant temperature and pressure for 3 hours to prepare a mixed solution, add zinc c...

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Abstract

The invention relates to a preparation method of a high-temperature-resistant gas-sensitive material and belongs to the technical field of gas sensor technologies. The method comprises the following steps: taking corn straws, corn leaves and rice hulls as raw materials and putting the same into hydrochloric acid to soak and dissolve part of tissue fibers, separating the plant fibers, corroding byusing citric acid so as to modify a fiber tube, so that the roughness degree of the tube wall of the fiber tube is increased, meanwhile, introducing a large amount of carboxyl group chelating zinc ions and generating nano-scale zinc oxide molecules through the reaction of diethylamine, adsorbing a large amount of zinc ions by the plant fibers through chelating so as to enable the generated nano-zinc oxide to be embedded into the plant fiber tube, and expanding to form holes, thereby increasing the contact area between the nano-scale zinc oxide and the air, and then, carbonizing the plant fibers, so that the zinc oxide molecules exist in the carbon environment, and the zinc oxide is difficult to corrode by external substances, simultaneously, the heat-conduction heat resistance of the carbon fiber is good, the heat resistance of the gas-sensitive material can be obviously improved, and a good application prospect is achieved.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature-resistant gas-sensitive material, which belongs to the technical field of gas sensors. Background technique [0002] In daily life, toxic gases produced by combustion, explosion, leakage, etc. permeate the air, seriously affecting people's healthy life. The detection means and methods for harmful gases have long been put on the agenda, and the society's demand for monitoring in this area is also increasing. [0003] Advanced chemical gas detection materials need to have low detection limit, high responsivity and response rate, good recovery and good physical properties (flexibility, lightness, etc.). Traditional chemical gas-sensitive materials often use semiconductor oxides as conductive fillers, and rigid materials such as quartz and ceramics as substrates. This inorganic composite material has a high response to chemical gases, but its high processing temperature and poor flexibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00D01F9/16
CPCD01F9/16G01N33/0004
Inventor 谭俊鸿
Owner 谭俊鸿
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