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Preparation method of printable nanocomposite elastic conductor, conductive paste and electronic fabric

A nanocomposite and conductive paste technology, applied in the field of nanomaterials, can solve the problems of difficult to form composites, poor conductivity and poor compatibility of carbon materials

Active Publication Date: 2018-09-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to the good compatibility between carbon materials and elastomers, at present, the elastic conductors that can be printed in the world are mainly filled with carbon materials (carbon nanotubes, graphene and carbon black), but the conductivity of carbon materials is relatively low. Poor, difficult to apply to occasions requiring high conductivity
Metal materials have excellent electrical conductivity, but metal nanomaterials are poorly compatible with elastomers, and it is difficult to form uniform composites. Therefore, the preparation of printable elastic conductors based on metal nanomaterials is an important field in the field of flexible / stretchable electronic devices. a major problem
[0004] From page 1257 of Volume 354 of "Nature" in 2016, it is reported that graphene is used as a filler and low-polymer silicone rubber is used as an elastic matrix. However, its electrical conductivity is only about 0.1S cm -1

Method used

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  • Preparation method of printable nanocomposite elastic conductor, conductive paste and electronic fabric
  • Preparation method of printable nanocomposite elastic conductor, conductive paste and electronic fabric
  • Preparation method of printable nanocomposite elastic conductor, conductive paste and electronic fabric

Examples

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preparation example Construction

[0040] The invention provides a method for preparing a printable nanocomposite elastic conductor, comprising the following steps:

[0041] Under grinding conditions, mixing the ethylene glycol dispersion of the silver nanowires and the dimethylformamide solution of the thermoplastic polyurethane elastomer to obtain a mixed slurry;

[0042] Precipitating flocculent precipitates in the mixed slurry in a coagulation bath to obtain a printable nanocomposite elastic conductor.

[0043] In the present invention, silver nanowires are used as conductive fillers, thermoplastic polyurethane elastomers are used as elastic substrates, dimethylformamide is used as a solvent, and they are mixed under heating and grinding conditions; then precipitated in a coagulation bath to obtain a printable nanocomposite elastic conductor , as the filling material of the elastic matrix, silver nanowires do not agglomerate and have good dispersion, so that the nanocomposite elastic conductor has good cond...

Embodiment 1

[0092]Settling the silver nanowire dispersion naturally for a week, pouring off the supernatant, leaving only the sediment at the bottom, adding 40mL of ethylene glycol, washing and evenly dispersing, and then centrifuging. , add 20mL ethylene glycol, ultrasonically disperse again, and finally let it stand for a week, remove the lower layer of sediment and add 5mL ethylene glycol, after ultrasonically disperse, the desired silver nanowire ethylene glycol dispersion is obtained, and the silver wire dispersion is quantified to 145mg ·mL -1 .

[0093] Weigh 10g of TPU (Bayer DP9370A) and place it in 20mL of DMF, let it stand for 12h to completely dissolve into a transparent colloid, then take 3g of TPU colloid and put it in a mortar, use a heating plate to heat the mortar to 60°C in advance and keep Maintain a constant temperature, then add 20mL DMF to dilute the TPU colloid to a uniform solution.

[0094] Take 0.5mL silver nanowire ethylene glycol dispersion, slowly add drop b...

Embodiment 2

[0106] Put the nanocomposite elastic conductor with a silver nanowire content of 0.91vol% prepared in Example 1 into a mortar, add 5mL of DMF, grind gently at 80°C, and disperse the composite into a uniform slurry, such as Figure 9 as shown, Figure 9 Schematic diagram of the appearance of the slurry configured for Example 2 of the present invention, and then the slurry was diluted to 20mL with DMF;

[0107] Then take 0.5mL of silver nanowire ethylene glycol dispersion, slowly drop it into the TPU solution, stir with a pestle to make the silver wire evenly dispersed in the TPU solution, and obtain a mixed slurry;

[0108] Slowly add the mixed slurry into 200mL of methanol, shake the beaker after adding, and obtain a flocculent composite; wash the flocculent composite repeatedly with water, and dry at 60°C to obtain a nanocomposite with a silver nanowire content of 1.76vol%. material elastic conductor.

[0109] The nanocomposite elastic conductor that embodiment 2 is prepare...

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Abstract

The invention provides a preparation method of a printable nanocomposite elastic conductor, conductive paste and an electronic fabric. The method comprises the following steps of mixing ethylene glycol dispersion liquid of a silver nanowire with a dimethylformamide solution of a thermoplastic polyurethane elastomer under heating and grinding conditions to obtain mixed paste; and separating out flocky precipitate from the mixed paste in a coagulation bath and obtaining the printable nanocomposite elastic conductor. According to the preparation method, the silver nanowire as a conductive filler,the thermoplastic polyurethane elastomer as an elastic matrix and dimethylformamide as a solvent are mixed under the heating and grinding conditions, and then the nanocomposite elastic conductor is separated out in the coagulation bath; and the silver nanowire and the elastic matrix have good compatibility and have good dispersity in the nanocomposite elastic conductor, so that the nanocompositeelastic conductor has a low conductive threshold and good conductivity, also has good flexibility and elasticity and good sensing property and can be printed into the electronic fabric.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a preparation method of a printable nanocomposite elastic conductor, a conductive paste and an electronic fabric. Background technique [0002] At present, elastic conductors have important application value in the preparation of various flexible / stretchable electronic devices. A common method is to give a specific shape structure to a rigid inorganic conductive material, such as a mesh, a wave or a spring. When subjected to deformation, the material undergoes a small strain through the deformation of the structure, and finally makes the elastic Conductors remain conductive when subjected to deformation. However, the preparation process of such devices is often expensive and complicated, which is not conducive to the practical application of flexible / stretchable electronic devices. [0003] Printable elastic conductors have more potential in the field of flexible / st...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01B13/30
CPCH01B1/22H01B13/00H01B13/0016H01B13/30
Inventor 俞书宏朱洪武赵浩雨施露安黄晋
Owner UNIV OF SCI & TECH OF CHINA
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