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Preparation method of nylon elastomer microporous composite stress strain sensing material

A technology of nylon elastomer and composite stress, which is applied in the field of polymer-based nanocomposites, can solve the problems of high density, low sensitivity and stability, and small deformation range of polymer-based conductive composite materials with isolated structures, and achieve excellent return The effect of elastic and repeatable compression properties, simple and effective preparation method, and low cost

Active Publication Date: 2019-05-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the as-prepared isolation-structured polymer-based conductive composites have higher density, smaller deformation range, and lower sensitivity and stability.

Method used

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  • Preparation method of nylon elastomer microporous composite stress strain sensing material
  • Preparation method of nylon elastomer microporous composite stress strain sensing material
  • Preparation method of nylon elastomer microporous composite stress strain sensing material

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preparation example Construction

[0025] A kind of preparation method of nylon elastomer microporous composite stress-strain sensing material of the present invention, specifically comprises the following steps:

[0026] Step 1, ultrasonically dispersing graphene oxide in deionized water to obtain a graphene oxide aqueous dispersion with a concentration of 1.5-6 mg / mL;

[0027] Step 2, place the nylon elastomer beads in a place filled with supercritical CO 2 Carry out saturation in a special autoclave, the temperature of the autoclave is controlled at 35-60°C, the pressure is 8-20MPa, and the nylon elastomer beads are saturated for 2-12 hours. After the beads are saturated, take out the saturated beads and weigh them immediately, and transfer them to a foaming container at a temperature of 120-150°C for foaming for 10-60s to obtain microporous foamed beads;

[0028] According to the hard segment type of nylon elastomer, it can be divided into nylon 66 type, nylon 610 type, nylon 1010 type, nylon 1212 type (in...

Embodiment 1

[0033] Weigh 0.045g of graphene oxide (GO) and disperse it into 30mL of deionized water, and ultrasonically disperse to obtain a GO aqueous dispersion with a concentration of 1.5mg / mL; weigh 15g of nylon 66 thermoplastic elastomer beads and add them to the autoclave Supercritical CO 2 For saturation, control the temperature of the autoclave at 35°C, the pressure at 8MPa, and saturate the beads for 2 hours. After the beads are saturated, take out the saturated beads and weigh them immediately, and then foam in a high-temperature oil bath at a temperature of 120°C for 20s. , to obtain nylon 66 microporous foam beads; the surface of the microporous foam beads is uniformly coated with graphene oxide dispersion, and put into a 40°C oven for drying to obtain nylon 66 graphene oxide-wrapped nylon elastomer Microporous foamed beads; in a water bath at 40°C, soak the nylon elastomer microporous foamed beads wrapped in graphene oxide in formic acid for 5 minutes, then take it out and pu...

Embodiment 2

[0035] Weigh 0.09g graphene oxide (GO) and disperse it into 30mL deionized water, and ultrasonically disperse to obtain a GO aqueous dispersion with a concentration of 3.0mg / mL; weigh 15g of nylon 610-type thermoplastic elastomer beads, and add them to the autoclave Supercritical CO 2For saturation, control the temperature of the autoclave at 40°C, the pressure at 12MPa, and saturate the beads for 4 hours. After the beads are saturated, take out the saturated beads and weigh them immediately, and then foam in a high-temperature oil bath at a temperature of 130°C for 30s. , to obtain nylon 610 microporous foamed beads; uniformly coat the graphene oxide dispersion on the surface of the microporous foamed beads, put it into an oven at 50 ° C for drying, and obtain nylon 610 type graphene oxide-wrapped nylon elastic Bulk microporous foam beads; in a water bath at 40°C, soak the nylon elastomer microporous foam beads wrapped in graphene oxide in formic acid for 10 minutes, then tak...

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Abstract

The invention discloses a preparation method of a nylon elastomer microporous composite stress strain sensing material. The preparation method specifically includes the following processes that oxidized graphene is subjected to ultrasonic dispersion to be in deionized water, and oxidized graphene aqueous dispersion is obtained; nylon elastomer microporous foamed beads are prepared according to a supercritical CO2 foaming technology; the microporous foamed beads are immersed in the oxidized graphene aqueous dispersion, and nylon elastomer microporous foamed beads wrapped with the oxidized graphene are obtained; a microporous foamed bead / oxidized graphene composite material is prepared according to the nylon elastomer microporous foamed beads wrapped with the oxidized graphene; and the microporous foamed bead / oxidized graphene composite material is immersed into hydroiodic acid to be subjected to in-situ reduction, a microporous foamed bead / reduced oxidized graphene composite material isobtained, and washed to neutrality, and the nylon elastomer microporous composite stress strain sensing material is obtained after drying. According to the preparation method of the nylon elastomer microporous composite stress strain sensing material, the obtained stress strain sensing material has the characteristics of low weight, low filling and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of polymer-based nanocomposite materials, and relates to a preparation method of a nylon elastomer microporous composite stress-strain sensing material Background technique [0002] Stress and strain sensing materials refer to a class of materials that convert the received stress or strain into visible electrical signals, which can be used to sense the surface force and deformation of the material, and have a wide range of applications in the fields of human health, sports monitoring, artificial intelligence, etc. use. Traditional stress and strain sensing materials are usually made of rigid materials such as metals and semiconductor strain gauges. Although they have good sensing performance and response capabilities, they are complex in process, high in cost, not suitable for bending, and poor in flexibility. sensing material requirements. Polymer-based nanocomposite sensing materials have good flexibilit...

Claims

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Application Information

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IPC IPC(8): C08J9/228C08J9/12C08L77/06C08K3/04
Inventor 马建中董点点马忠雷邵亮高锦鹏魏阿静康松磊
Owner SHAANXI UNIV OF SCI & TECH