Flexible sensing material with adaptive piezoresistive performance and preparation method and application thereof

A sensing material and flexible technology, applied in the field of flexible piezoresistive composite materials, the preparation of flexible piezoresistive sensor materials, and materials for sensors, which can solve the piezoresistive performance response sensitivity adjustment, wide working range, and no elastomer material found. problems, to achieve the effect of improving the effective working range and improving the piezoresistive response performance

Active Publication Date: 2021-09-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the material structure, the currently researched piezoresistive sensing materials are difficult to meet high sensitivity and wide working range at the same time; and the existing technology has never discovered and realized that the piezoresistive properties of elastomer materials can be influenced by the application scene. while achieving adjustable effects
Once the existing flexible piezoresistive sensing materials are prepared, their microstructure and mechanical properties are basically stable. Therefore, it is difficult to adjust the piezoresistive properties (such as working range, response sensitivity, etc.) Applications in Flexible Stress Sensing

Method used

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  • Flexible sensing material with adaptive piezoresistive performance and preparation method and application thereof
  • Flexible sensing material with adaptive piezoresistive performance and preparation method and application thereof
  • Flexible sensing material with adaptive piezoresistive performance and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Materials: Silicone resin (Ecoflex 00-20, Parts A and B) was provided by Smooth-On, Inc.; magnetic carbonyl iron particles (CIP) were obtained from Nangong Xindun Alloy Welding Material Spraying Co., Ltd.; Kanghao Polymer Science Ltd. purchased melamine sponges.

[0053] method:

[0054] Commercially produced polymelamine foam is carbonized at high temperature by high-temperature carbonization method to prepare carbon foam material (CS) with three-dimensional conductive network structure. Specifically, the organic foam material is washed in ethanol to remove impurities, dried and placed in a tube furnace, under the protection of an inert gas and at 800 ° C, in N 2 After carbonizing in the atmosphere for 2 hours, cool down to room temperature under the protection of inert gas, and then cut into 40×11×3.5mm 3 shape, made of carbon sponge (CS).

[0055] A series of proportions of carbonyl iron particles (CIP) and silicone resin are uniformly dispersed, and the composite...

Embodiment 2

[0059] Materials: MDI and polyether were provided by Yantai Wanhua; carbonyl nickel powder was obtained from Weifang Kena Powder Metallurgy Factory; phenolic resin foam was purchased from Shandong Shengquan Chemical Co., Ltd.

[0060] method:

[0061] A high-temperature carbonization method is used to carbonize phenolic resin foam obtained from commercial channels at high temperature to prepare a carbon foam material with a three-dimensional conductive network structure. Specifically, the organic foam material is washed in ethanol to remove impurities, dried and placed in a tube furnace, under the protection of an inert gas and at 900 ° C, carbonized in a He atmosphere for 2 hours, then cooled to room temperature under the protection of an inert gas, and then Cut into 40×11×3.5mm 3 shape, made of carbon sponge.

[0062] A certain proportion of nickel carbonyl particles and MDI are compounded and dispersed evenly, then polyether is added, and then the composite fluid is impre...

Embodiment 3

[0064] Materials: Natural rubber latex was provided by Shanghai Liankangming Chemical Co., Ltd.; cobalt carbonyl powder was obtained from McLean; starch plastic foam was purchased from the market.

[0065] method:

[0066] A high-temperature carbonization method is used to carbonize starch plastic foam obtained from commercial channels at high temperature to prepare a carbon foam material with a three-dimensional conductive network structure. Specifically, the organic foam material is washed in ethanol to remove impurities, dried and placed in a tube furnace, under the protection of an inert gas and at 900 ° C, in N 2 After carbonizing in the atmosphere for 2 hours, cool down to room temperature under the protection of inert gas, and then cut into 40×11×3.5mm 3 shape, made of carbon sponge.

[0067] Compound and disperse a certain proportion of cobalt carbonyl particles and natural rubber latex evenly, then add a vulcanizing agent, and then impregnate the composite fluid int...

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Abstract

The invention provides a flexible sensing material with adaptive piezoresistive performance and a preparation method and application thereof. The flexible sensing material specifically comprises a conductive filler, a magnetic filler and an elastic high polymer material. The three-dimensional network structure of the conductive filler is damaged under the action of external force, and the resistivity of the material changes; when the stress is removed, the conductive network is recovered by depending on the elasticity of the high polymer material, and the resistivity of the material also returns to the initial state, so that the stress detection can be completed; under the action of a magnetic field, the magnetic filler in the material moves along the direction of the magnetic field to form a chain structure so that the compression modulus of the piezoresistive sensing material is increased, and the pressure detection range of the sensing material under the same compression strain is further adjusted. Compared with a traditional flexible piezoresistive material, the material keeps relatively high response sensitivity in a low stress range; and the working range is greatly enlarged after the magnetic field is applied. The material can realize the detection of micro stress and large stress, and is beneficial to the portable, integrated and intelligent design of the flexible stress sensor.

Description

technical field [0001] The invention relates to a flexible piezoresistive composite material, which belongs to the field of intelligent materials, in particular to a sensor material whose piezoresistive performance adapts to changes in the magnetic field environment. The invention also relates to a preparation method and application of a flexible piezoresistive sensor material. Background technique [0002] Flexible piezoresistive sensing material is a smart material that deforms under the action of external force and causes its resistance to change. It is the core sensing material of stress and strain sensors, and is widely used in medical health, automobile, industrial automation, aerospace and other fields. [0003] In the prior art, the application number of the applicant University of Science and Technology of China is 201910806047.X, which discloses a multifunctional flexible sensing material in the invention patent application titled "Multifunctional Flexible Sensing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/18C08K7/24C08G18/76C08G18/48C08L7/00A61B5/00A61B5/08G01C22/00G01P3/44
CPCC08K3/18C08K7/24C08G18/7671C08G18/48G01P3/44G01C22/00A61B5/08A61B5/681C08K2201/01C08K2201/001C08L83/04C08L7/00
Inventor 黄培杨刚付绍云李元庆
Owner CHONGQING UNIV
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