A fast-response high-sensitivity polymer-based gas-sensing material and its preparation method and application

A high-sensitivity, gas-sensing material technology, which is applied in the field of fast-response and high-sensitivity polymer-based gas-sensing materials and its preparation, can solve the problems of reduced gas-sensing response time and long response time, and achieve low initial resistance , fast response, high gas sensitivity

Active Publication Date: 2020-08-11
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of long gas response time of conductive particle-filled silicone rubber gas-sensing materials, a fast-response and high-sensitivity polymer-based gas-sensing material and its preparation method are provided. And early warning function, the gas sensitivity response time is significantly reduced, high gas sensitivity can be achieved in a short time, and it has good repeatable stability

Method used

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  • A fast-response high-sensitivity polymer-based gas-sensing material and its preparation method and application
  • A fast-response high-sensitivity polymer-based gas-sensing material and its preparation method and application
  • A fast-response high-sensitivity polymer-based gas-sensing material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Filler pre-dispersion: Blend 0.5 parts of quaternary ammonium salt-modified montmorillonite and 16 parts of carbon nanofibers, add n-hexane, and then disperse at room temperature with ultrasound at 10000 Hz for 20 min to obtain carbon nanofibers and the suspension dispersion of quaternary ammonium salt modified montmorillonite, the consumption of n-hexane is 20ml n-hexane for 1g carbon nanofiber;

[0032] (2) Preparation of carbon nanofiber / quaternary ammonium salt modified montmorillonite / vinyl silicone oil blend: first dissolve 100 parts of liquid vinyl silicone oil in n-hexane, and then mix it with carbon nanofiber and quaternary ammonium salt The mixed suspension of the modified montmorillonite was mixed and stirred at a high speed. The conditions were as follows: first, 500 rpm for 10 min, then 2000 rpm for 20 min, and finally 3000 rpm for 20 min; to obtain carbon nanofiber / quaternary ammonium salt modified montmorillonite Mixed solution of desoil / vinyl silicon...

Embodiment 2

[0035] (1) Filler pre-dispersion: blend 7 parts of cetyltrimethylammonium bromide montmorillonite and 35 parts of carbon black, add solvent tetrahydrofuran, and then use ultrasonic dispersion at 100000 Hz for 10 min at room temperature , to obtain a suspension dispersion of carbon black and montmorillonite; THF consumption is 10 ml THF for 1 g of carbon black;

[0036] (2) Preparation of carbon black / cetyltrimethylammonium bromide montmorillonite / vinyl silicone oil blend: first dissolve 100 parts of vinyl silicone oil in tetrahydrofuran, and then mix it with carbon black and hexadecane Mix the mixed suspension of trimethylammonium bromide montmorillonite and stir at a high speed, the conditions are as follows: first stir at 500 rpm for 10 min, then stir at 2000 rpm for 15 min, and finally stir at 3000 rpm for 15 min; Mixed solution of hexaalkyltrimethylammonium bromide montmorillonite / vinyl silicone oil, the feeding ratio of vinyl silicone oil is: 4 ml tetrahydrofuran is put i...

Embodiment 3

[0039] (1) Filler pre-dispersion: In parts by weight, 0.05 parts of montmorillonite and 4 parts of silane-modified carbon tubes were blended, and the solvent toluene was added, and then ultrasonically dispersed at 5000 Hz for 30 min at room temperature. Obtain the suspension dispersion liquid of carbon tube and montmorillonite; The consumption of toluene is that 1 g carbon tube uses 20 ml solvent;

[0040](2) Preparation of carbon tube / montmorillonite / vinyl silicone oil blend: first dissolve 100 parts of vinyl silicone oil in toluene, and then mix it with the mixed suspension of carbon tube and montmorillonite. And high-speed stirring, the conditions are as follows: first stirring at 500 rpm for 10 minutes, then stirring at 2000 rpm for 15 minutes, and finally stirring at 3000 rpm for 15 minutes; to obtain a mixed solution of carbon tubes / montmorillonite / silicone rubber. The feeding ratio of vinyl silicone oil is: 3 ml of toluene is put into 1 g of vinyl silicone oil;

[0041...

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Abstract

The invention belongs to the technical field of functional composite materials, and provides a fast-response highly-sensitive polymer-based gas-sensitive material and a preparation method thereof in order to solve the problem of long gas response time of a silicon rubber gas-sensitive material filled with conductive particles. The gas-sensitive material comprises, by mass, 2-35 parts of conductive nano-particles, 100 parts of silicone rubber and 0.05-7 part of montmorillonite. The preparation method comprises the steps of solution blending, and casting film molding. The material has detection and early warning functions to toxic and flammable solvent vapor, obviously shortens the gas response time, can reach a high gas sensitivity within a short time, and has a very good reusable stability.

Description

technical field [0001] The invention belongs to the technical field of functional composite materials, and in particular relates to a fast-response and high-sensitivity polymer-based gas-sensing material and its preparation method and application. Background technique [0002] The main component of silicone rubber is polysilane containing an inorganic main chain formed by -Si-O- as a repeating unit and an organic side chain represented by a methyl group. Due to the particularity of the silane chain, the silicone rubber has excellent heat resistance. Cold resistance, aging resistance, acid and alkali resistance and solvent resistance. The addition of nano-conductive particles such as carbon nanofibers and graphene endows silicone rubber materials with excellent mechanical properties and functional properties such as electrical conductivity and thermal conductivity. At present, conductive silicone rubber has been widely used in many aspects such as electromagnetic shielding, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K9/04C08K3/34C08K7/06C08K9/06C08K3/04C08K7/24G01N27/12
CPCC08K2201/001C08K2201/011C08L83/04C08L2205/025G01N27/126G01N27/127C08K9/04C08K3/346C08K7/06C08K3/04C08K9/06C08K7/24
Inventor 赵丽强飞汤龙程吴连斌蒋剑雄
Owner HANGZHOU NORMAL UNIVERSITY
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