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Humidity-sensitive composite membrane, preparation method of humidity-sensitive composite membrane and humidity sensor

A moisture-sensitive composite film and film-forming technology, applied in the field of sensitive materials, can solve the problems of long measurement period (generally more than one week, difficult and cumbersome accurate detection, expensive equipment, etc.)

Active Publication Date: 2015-04-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult and cumbersome to accurately detect low-humidity environments (≤30%RH), and the required equipment such as dew point meters has a long measurement cycle (generally more than one week), and the equipment is expensive (generally more than 100,000 yuan)

Method used

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  • Humidity-sensitive composite membrane, preparation method of humidity-sensitive composite membrane and humidity sensor
  • Humidity-sensitive composite membrane, preparation method of humidity-sensitive composite membrane and humidity sensor
  • Humidity-sensitive composite membrane, preparation method of humidity-sensitive composite membrane and humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The preparation method of moisture-sensitive composite film of the present invention comprises the following steps:

[0066] ① Prepare a mixed solution of poly(4-vinylpyridine) and polyvinyl butyral, the concentration of poly(4-vinylpyridine) is 36 mg / mL, and the concentration of polyvinyl butyral is 5 mg / mL;

[0067] ② Add 1,4-dibromobutane with a molar ratio of 2 times that of poly(4-vinylpyridine), and age for 10 h to form a mixed solution;

[0068] ③ After drying the mixed solution in step ② to form a film, heat at 110°C for 10 h to prepare the first layer of polyelectrolyte membrane;

[0069] ④ Prepare a mixed solution of silver nitrate and polyvinyl alcohol, the concentration of silver nitrate is 0.05mol / L, and the concentration of polyvinyl alcohol is 30mg / mL;

[0070] 5. the mixed solution in step 4. is formed into a film on the polyelectrolyte membrane and dried;

[0071] ⑥ In the glutaraldehyde environment, the in situ reduction cross-linking reaction was ca...

Embodiment 2

[0115] ① Prepare a mixed solution of poly(2-vinylpyridine) and polyvinyl alcohol, the concentration of poly(2-vinylpyridine) is 5 mg / mL, and the concentration of polyvinyl alcohol is 100 mg / mL;

[0116] ② Add 1,5-dibromopentane with a molar ratio of 0.2 times poly(2-vinylpyridine), and age for 48 h to form a mixed solution;

[0117] ③ After drying the mixed solution in step ② to form a film, heat at 40°C for 48 h to prepare the first layer of polyelectrolyte membrane;

[0118] ④ prepare a mixed solution of copper sulfate and polyethylene glycol, the concentration of copper sulfate is 0.005mol / L, and the concentration of polyethylene glycol is 300mg / mL;

[0119] 5. the mixed solution in step 4. is formed into a film on the polyelectrolyte membrane and dried;

[0120] ⑥ Under the environment of adipaldehyde, carry out in situ reductive cross-linking reaction for 48 hours at a temperature of 10°C to prepare a moisture-sensitive composite film.

[0121] The resulting moisture-se...

Embodiment 3

[0123] ① Prepare a mixed solution of poly(4-vinylpyridine) and polyvinylpyrrolidone, the concentration of poly(4-vinylpyridine) is 400 mg / mL, and the concentration of polyvinylpyrrolidone is 0.5 mg / mL;

[0124] ② Add 1,6-dibromohexane with a molar ratio of 15 times poly(4-vinylpyridine), and age for 0.5 h to form a mixed solution;

[0125] ③ After drying the mixed solution in step ② to form a film, heat at 200°C for 0.2 h to prepare the first layer of polyelectrolyte membrane;

[0126] ④ Preparation of chloroauric acid (H[AuCl 4 ]) and polypropylene glycol mixed solution, the concentration of chloroauric acid is 1mol / L, and the concentration of polypropylene glycol is 3mg / mL;

[0127] 5. the mixed solution in step 4. is formed into a film on the polyelectrolyte membrane and dried;

[0128] ⑥ Under the environment of malondialdehyde, the in situ reduction cross-linking reaction was carried out at 200 °C for 0.1 h to prepare the moisture-sensitive composite film.

[0129] The...

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Abstract

The invention discloses a humidity-sensitive composite membrane. The humidity-sensitive composite membrane comprises a polyelectrolyte membrane and a conductive metal nanoparticle membrane. The polyelectrolyte membrane is obtained by a crosslinked quaternization reaction of a synthetic pyridine ring-containing polymer and dihaloalkane. The metal nanoparticle membrane is obtained by in-situ reduction crosslinking after metal salt-polymer mixed solution film forming. The humidity-sensitive composite membrane has low impedance (less than or equal to 10 megohms and even less than or equal to 1 megohm so that equipment detection is convenient) at low humidity (less than or equal to 30% RH), has high response sensitivity (wherein, preferably, 1-30% RH impedance change rate is 2000%), has good stability and water resistance, can be widely used for environment humidity detection and control in industrial and agricultural production, storage, meteorology, power supply security and protection, and daily life, and is especially suitable for sensitive detection of humidity in low-humidity environments such as insulating gas SF6 in a transformer box.

Description

technical field [0001] The invention relates to the field of sensitive materials, in particular to a moisture-sensitive composite film, a preparation method thereof and a humidity sensor. Background technique [0002] The research and application of chemically sensitive materials is an important field in the development of science and technology in today's society. It plays a very important role in modern industrial and agricultural production and the detection and regulation of people's living environment. [0003] Humidity is a physical quantity indicating the water vapor content in the air, and relative humidity is the partial pressure (P W ) and the partial pressure of saturated water vapor at the same temperature (P N ), the percentage [0004] [0005] Usually, the symbol %RH is used to represent relative humidity (Relative Humidity). When the temperature and pressure change, the relative humidity of the water vapor in the gas will change even if the pressure of ...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 李扬杨慕杰班会涛吴涛涛
Owner ZHEJIANG UNIV
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