Oxide/silicate mineral fiber nano composite air-sensitive film and preparation method thereof

A silicate mineral and nano-composite technology, applied in the direction of material resistance, can solve the problems of easy cracking, poor toughness, and easy falling off of sensitive film layers, and achieve high specific strength, prevent fracture, and improve gas-sensing performance.

Inactive Publication Date: 2009-12-23
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the above-mentioned prior art that the sensitive film layer of the thick-film gas sensor is easy to fall off, poor toughness, easy to break, etc., the object of the present invention is to provide a kind of oxide / silicic acid with good crack resistance, toughness and stability Salt mineral fiber nanocomposite gas sensitive membrane and preparation method thereof

Method used

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Examples

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Comparison scheme
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preparation example Construction

[0020] The preparation method of the oxide / silicate mineral fiber nanocomposite gas-sensitive membrane of the present invention, the steps are as follows:

[0021] 1) get silicate mineral fiber, carry out pretreatment;

[0022] 2) Soak the pretreated silicate mineral fiber in step 1) in water at a solid-to-liquid mass ratio of 1:100 to 1:50 to obtain a silicate mineral fiber bottom liquid; The pH value of the silicate mineral fiber bottom solution is adjusted to a reaction pH value of 1-6, and the reaction temperature is 20-40°C;

[0023] 3) Slowly drop the metal salt solution containing the corresponding oxide powder components at a concentration of 0.01 to 0.25 mol / L and dilute ammonia water into the silicate mineral fiber in step 2) at the same time at a rate ratio of 2:1 to 5:1 In the bottom liquid, control the reaction pH value and the reaction temperature to be constant, and stir the silicate mineral fiber bottom liquid, and obtain the hydroxide / silicate composite nanof...

example 1

[0029] Method operation steps of the present invention are as follows:

[0030] Step 1: Use chrysotile mineral fiber as raw material, first pretreatment; use CTS(N.S)-66 wet magnetic separator manufactured by Shandong Weifang Hengji Magnetoelectric Machinery Co., Ltd., through conventional wet purification and magnetic separation Finally, put the serpentine mineral fiber into a strong electric mixer to fully stir and disperse it, and then add it to the ultrasonic emulsification machine for ultrasonic dispersion to achieve uniformity; among them, the electric mixer is D90-2F manufactured by Hangzhou Instrument Motor Co., Ltd. Electric mixer; Ultrasonic emulsification machine chooses the SH3000 ultrasonic emulsification machine produced by Jining Shuanghe Ultrasonic Equipment Co., Ltd.; secondly: place the serpentine mineral fiber after ultrasonic dispersion uniformly in the container, and the container used can be used according to the amount of material dispersion how much to ...

example 2

[0035] Step 1: the pretreatment step is basically the same as Example 1, the difference is that the silicate mineral fiber is made of amphibole mineral fiber as a raw material; the amphibole mineral fiber dispersed uniformly by ultrasonic waves is placed in a container, and amphibole mineral fiber is added to the container The mass of 0.1% sodium lauryl sulfate of amphibole mineral fiber is fully soaked and wet, and then put into a strong electric mixer to disperse; finally, the treated amphibole mineral fiber is filtered with a 300-mesh filter cloth and dried at 60°C 10h; then heat treatment at 300°C for 1h to remove sodium dodecyl sulfate.

[0036] Step 2: Soak the pretreated amphibole mineral fiber in water at a solid-to-liquid mass ratio of 1:80 to prepare the amphibole mineral fiber bottom liquid, and use 10% dilute hydrochloric acid to dissolve the amphibole mineral fiber bottom liquid The pH value of the solution was adjusted to 3;

[0037] Step 3: Slowly drop ferric c...

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Abstract

The invention discloses an oxide / silicate mineral fiber nano composite air-sensitive film and a preparation method thereof, belonging to the technical field of functional composite material. The oxide / silicate mineral fiber nano composite air-sensitive film comprises silicate mineral fiber nano material substrate and a nano oxide powder layer coated on the surface of the silicate mineral fiber nano material substrate; wherein silicate mineral fiber nano material is any one in the minerals such as chrysotile, amphibole, meerschaum and palygorskite; and nano oxide powder is any one of nano stannic oxide, nano ferric oxide, nano zinc oxide and nano copper oxide. Compared with the prior art, the oxide / silicate mineral fiber nano composite air-sensitive film obtained by adopting the method has the tensile strength being improved from 10-50MPa to 100-3000MPa and the fracture toughness be enhanced from 3-5MPa.m1 / 2 to 100-500MPa.m1 / 2; the air-sensitive stability and the service life are improved by 80-100%.

Description

technical field [0001] The invention relates to a composite gas-sensitive film and a preparation method thereof, in particular to an oxide / silicate mineral fiber nano-composite gas-sensitive film and a preparation method thereof; it belongs to the technical field of functional composite materials. Background technique [0002] Semiconductor oxides such as nano-tin dioxide, nano-iron oxide, and nano-zinc oxide have excellent semiconductor properties and gas-sensing properties. They are often used as gas-sensing materials to make thick-film gas-sensing elements. They are used in various gas monitoring, industrial production and Explosion protection plays an important role in everyday life. However, after a period of use, the thick film gas sensor usually has poor toughness, and the sensitive film layer falls off, breaks, etc., which makes the stability of the gas sensor worse and affects the service life. [0003] "Environmental Science and Engineering" 2005, 28 (3): 18-20 pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C03C25/16
Inventor 彭同江刘海峰孙红娟
Owner SOUTHWEAT UNIV OF SCI & TECH
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