Method for preparing humidity-sensitive switch flexible sensing material

A technology for sensing materials and switches, which is applied in the field of preparation of flexible humidity-sensitive switch sensing materials, can solve problems such as unsatisfactory measurement results, complex sensor fabrication process, and contact, and achieves a simple and convenient preparation method and constant polymer mass fraction. , the effect of uniform and smooth surface

Inactive Publication Date: 2015-02-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this kind of sensor is complicated, it needs hard materials such as metal sheets and ceramic substrates, and it cannot be in contact with the monitoring environment in all directions, and the measurement results under high humidity conditions are not ideal, and further research and improvement are needed.

Method used

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  • Method for preparing humidity-sensitive switch flexible sensing material
  • Method for preparing humidity-sensitive switch flexible sensing material
  • Method for preparing humidity-sensitive switch flexible sensing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown, it is a schematic diagram of a carbon nanotube composite yarn preparation device, and the carbon nanotube composite yarn preparation device includes a winding roller 1, a yarn guide needle 2, a composite tank 3, a water bath 4, a heating table 5, and a heating device 6 and spool 7. The winding roller 1 and the bobbin 7 are respectively connected to the motor, the composite tank 3 is arranged in the water bath 4, and the water bath 4 is arranged on the heating table 5, and the carbon nanotube yarn or the carbon nanotube film is wound out from the winding roller 1, passed through the guide Guided by the yarn needle 2, it enters the compound groove 3 for compounding. The length of the carbon nanotube yarn or film in contact with the polymer solution is about 20 mm. Between two heating devices 6, drying is carried out, so that the polymer is quickly solidified on the surface of the carbon nanotube fiber, and wound on the bobbin to obtain a composite...

Embodiment 2

[0037] A method for preparing a carbon nanotube / polyvinyl alcohol composite yarn moisture-sensitive switch flexible sensing material, using the carbon nanotube composite yarn preparation device described in Example 1, the specific steps are:

[0038] (1) 2.5g of polyvinyl alcohol polymer was dissolved in 40ml of water and 10ml of alcohol to prepare a polyvinyl alcohol solution with a polymer mass fraction of 5%. Pour the polyvinyl alcohol solution into the composite tank of the carbon nanotube composite yarn preparation device described in Example 1. The composite tank is heated in a water bath, and the temperature of the water bath is 60°C;

[0039] (2) Selecting a carbon nanotube yarn with a twist angle of 20° and a diameter of about 60um. The carbon nanotube yarn is wound out from the winding roller at a winding speed of 20mm / min, guided by the yarn guide needle, and entered into the composite groove for compounding. The residence time of the carbon nanotube yarn in the co...

Embodiment 3

[0045] A method for preparing a carbon nanotube / polyvinyl alcohol composite film moisture-sensitive switch flexible sensing material, using the carbon nanotube composite yarn preparation device described in Example 1, the specific steps are:

[0046] (1) 1.5g polyvinyl alcohol polymer is dissolved in 50ml dimethyl sulfoxide (DMSO) solution and prepares the polyvinyl alcohol solution (membrane material is more compact, polymer solution concentration is lower, so that the polymer penetrates into the interior of the membrane material). Pour the polyvinyl alcohol solution into the composite tank of the carbon nanotube composite film preparation device described in Example 1. The composite tank is heated in a water bath, and the temperature of the water bath is 70°C;

[0047] (2) The carbon nanotube film is selected to be cut into narrow strips with a width of 2 cm, and wound on a winding roller for standby. The carbon nanotube film is wound out from the winding roller, and the w...

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Abstract

The invention provides a method for preparing a humidity-sensitive switch flexible sensing material. The method for preparing the humidity-sensitive switch flexible sensing material is characterized by specifically comprising the following steps: preparing at least one polymer solution, pouring the polymer solution into at least one composite tank, performing water bath heating on the composite tank, unwinding a carbon nano tube fiber or carbon nano tube membrane from a winding roller, leading through a leading needle, and feeding into the composite tank for combination; after the combination, performing grouting treatment through the guide needle, guiding, feeding into a heating area for drying so as to cure the polymer on the surface and inside the carbon nano tube fiber or carbon nano tube membrane, thereby obtaining the humidity-sensitive switch flexible sensing material. The humidity-sensitive switch flexible sensing material can be wound on a wire shaft connected with a motor. The humidity-sensitive switch flexible sensing material has the advantages of being low in cost, good in flexibility, good in conductivity, fiber-like, capable of being embedded into a monitored environment to be in contact with the monitored environment in all directions, and the like.

Description

technical field [0001] The invention relates to a preparation method of a flexible moisture sensitive switch sensing material based on carbon nanotube / polyvinyl alcohol (CNT / PVA) composite yarn. Background technique [0002] Humidity is closely related to people's life, industrial production, scientific research, national defense construction, and the growth of animals and plants. The resistive humidity sensor uses humidity sensitive materials to directly adsorb water molecules in the atmosphere, so that the electrical properties of the materials change, and the resistance output signal of the sensitive element is detected to measure the humidity change in the environment. [0003] At present, people have carried out a lot of research on the humidity sensor based on carbon nanotubes, and produced different types of carbon nanotube humidity sensors, among which the resistive type is the most studied type of carbon nanotube humidity sensor. Most of the current related researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K7/24
Inventor 许福军李维刘玮邱夷平
Owner DONGHUA UNIV
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