Preparation method of elastic conductive paste

Abstract

The invention relates to the technical field of flexible electronics, in particular to a preparation method of elastic conductive paste. The elastic conductive paste prepared by the method of the elastic conductive paste can be used for printing and processing. The problems solved by the preparation method of the elastic conductive paste are as follows: (1) uniformly mixing of conductive filler with high length-diameter ratio and an elastic polymer is solved, so that a uniform conductive network structure is formed in the elastic paste, and high stretching electrical stability is achieved; and (2) by adding a surfactant, the solvent evaporation and phase separation process during the drying process of the paste is facilitated, more conductive filer is generated on a surface of a paste system, so that the initial conductivity is improved. The preparation method of the elastic conductive paste is reasonable in structural design, high-efficiency and rapid preparation is achieved, and the preparation method is suitable for promotion and application.

Description

technical field [0001] The invention relates to the technical field of flexible electronics, in particular to a method for preparing elastic conductive paste. Background technique [0002] Flexible electronics refers to a type of electronic device that still maintains normal functions during the process of bending, folding or even stretching deformation under the action of external force. Compared with traditional electronic products based on rigid circuit board technology, flexible electronics can be directly applied to the three-dimensional free-form surface working environment, promote the fusion and interaction of human-machine information in the fields of biomedicine, leisure and entertainment, and meet the requirements of portability and comfort. Therefore, it will greatly expand the application range of current electronic products, so it has received extensive attention from academia and industry [0003] In order to adapt to the development of flexible electronics, ...

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Problems solved by technology

[0004] Although there have been reports on the direct mixing of conductive nanomaterials and elastic polymers to obtain elastic conductive pastes, there is still a very important problem in the elastic pastes prepared at present, such as low initial conductivity and poor tensile electrical stability. Seriously restricts the application of elastic conductive paste

The reason for the low initial conductivity is mainly because the elastic conductive paste must ensure a certain degree of scalability under the premise of satisfying the conductivity, so the proportion of conductive filler will be much lower than that of ordinary conductive paste. , so the initial conductivity of the current elastic conductive paste is relatively low; the reason for the poor electrical stability of stretching is mainly that the conductive fillers of the current elastic conductive paste are basically metal particles or carbon black powders that do not have an aspect ratio Conductive materials, so that it is impossible to build an effective conductive network structure in the slurry system, so the resistance characteristics will change sharply during slight stretching

The reason why the conductive filler does not choose conductive materials such as metal wires and metal sheets with a high aspect ratio is mainly related to the current preparation method. The reported preparation method is to combine the dry conductive filler with the elastic polymer by external force. The resin is dispersed and mixed, but due to the special one-dimensional linear structure of the metal nanowires, it is very easy to form an aggregation network similar to the intertwining of fibers after drying, so it is difficult for subsequent simple mechanical stirring to mix the intertwined silver nanowire solid powder with the High-viscosity elastic polymers are mixed evenly to form an effective conductive network structure

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