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Pressure sensitive composite material used in flexible sensor and preparation method thereof

A pressure-sensitive composite material and flexible sensor technology, applied in the field of sensors, can solve the problems affecting the electrical conductivity and piezoresistive properties of the pressure-sensitive composite material, poor dispersion, etc., and achieve excellent processability, improved mechanical properties, and excellent aging resistance. Effect

Inactive Publication Date: 2019-10-15
SHAOXING UNIV YUANPEI COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The second object of the invention of the present invention is to overcome the prior art when carbon black is used as the conductive particles in the pressure-sensitive silicone rubber, because the larger the specific surface area of ​​the carbon black, the larger the surface energy, so the carbon black is easy to form agglomeration, Dispersion is poor, thereby affecting the conductive properties and piezoresistive properties of pressure-sensitive composite materials, providing a pressure-sensitive composite material used in flexible sensors and its preparation method, improving the dispersion of conductive particles in pressure-sensitive composite materials, and Improving the overall performance of pressure-sensitive composites

Method used

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  • Pressure sensitive composite material used in flexible sensor and preparation method thereof
  • Pressure sensitive composite material used in flexible sensor and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] 20g Ketjen carbon black ECP600JD, 5g carbon nanotubes, 20g nano-SiO 2 and 40g of 2% silane coupling agent Si-69, added to 115g of naphtha, stirred and ultrasonically dispersed for 30min to form a dispersion. Add 450g room temperature vulcanized silicone rubber Dow Corning 184 to the dispersion, stir magnetically at room temperature for 3 hours to form a viscous mixture, place the mixture in a vacuum drying oven at 40°C and dry for 20 minutes to remove air bubbles and incompletely volatilized naphtha, That is, an uncured pressure-sensitive composite material is obtained.

Embodiment 2

[0049] 20g Ketjen carbon black ECP600JD, 5g carbon nanotubes, 5g nano-SiO 2 and 10g of 2% silane coupling agent Si-69, added to 85g of naphtha, stirred and ultrasonically dispersed for 30min to form a dispersion. Add 350g room temperature vulcanized silicone rubber Dow Corning 184 to the dispersion, stir magnetically at room temperature for 3 hours to form a viscous mixture, place the mixture in a vacuum drying oven at 40°C and dry for 20 minutes to remove air bubbles and incompletely volatilized naphtha, That is, an uncured pressure-sensitive composite material is obtained.

Embodiment 3

[0051] 75g Ketjen carbon black ECP600JD, 25g carbon nanotubes, 20g nano-SiO 2 And 40g of 2% silane coupling agent Si-69, add 25g of n-hexane, 65g of naphtha and 25g of absolute ethanol mixed solution, after stirring, ultrasonically disperse for 60min to form a dispersion. Add 450g of room temperature vulcanized silicone rubber Dow Corning 184 to the dispersion, stir magnetically at room temperature for 8 hours to form a viscous mixture, place the mixture in a vacuum drying oven at 100°C for 30 minutes, and remove air bubbles and incompletely volatilized solvents. Uncured pressure-sensitive composites were obtained.

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Abstract

Relating to the sensor field, the invention discloses a pressure sensitive composite material used in a flexible sensor and a preparation method thereof. The pressure sensitive composite material usedin a flexible sensor comprises the following components by weight: 350-450 parts of silicone rubber, 25-100 parts of conductive particles, 5-20 parts of a nano modified material, 15-40 parts of an assistant, and 85-115 parts of a solvent. The conductive particles include carbon black and carbon nanotubes. The preparation method includes: dispersing the conductive particles and the nano modified material in the assistant to form a dispersion solution; adding silicone rubber into the dispersion solution, and stirring the substances evenly to obtain a mixed solution; and performing vacuum dryingon the mixed solution to obtain the pressure sensitive composite material. According to the invention, carbon black and carbon nanotubes are used as the conductive particles together, and the combined use of carbon black and carbon nanotubes in the silicone rubber can play a role of synergistic enhancement, the electrical conductivity and stability of the conductive particles and the mechanical properties of the composite material are all greatly improved, the pressure sensitive composite material has higher perception sensitivity, and the pressure perception range is improved.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a pressure-sensitive composite material in a flexible sensor and a preparation method thereof. Background technique [0002] With the improvement of science and technology and modernization level, people have higher and higher requirements for pressure monitoring. It is no longer limited to pressure monitoring on regular rigid surfaces, and there are various forms. Ordinary rigid sensors can no longer meet people's actual needs. . Flexible pressure sensors can be bent or even folded at will, small in size, thin in thickness, flexible materials are basically non-toxic and harmless, and have good compatibility with the human body. A lot of research and application have been done. [0003] Pressure-sensitive silicone rubber is made of conductive particles filled in a silicone rubber matrix and processed through a series of processes. The insulating polymer material silicone rubber can obta...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K3/04C08K3/36C08K9/06G01L1/18G01L9/06
CPCC08K3/04C08K3/36C08K9/06C08K2201/001C08K2201/011C08K3/041G01L1/18G01L9/06C08L83/04
Inventor 徐志望
Owner SHAOXING UNIV YUANPEI COLLEGE
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