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A modified conductive paste and its preparation method and application

A conductive paste and modification technology, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of low conductivity of carbon-based conductive paste and poor conductivity of carbon-based conductive paste. and other problems, to achieve the effect of low cost, high thermal conductivity and high electrical conductivity

Active Publication Date: 2020-11-06
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of carbon-based conductive paste is still relatively low, especially when the content of carbon materials is low, the conductive effect of carbon-based conductive paste is very poor

Method used

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  • A modified conductive paste and its preparation method and application
  • A modified conductive paste and its preparation method and application
  • A modified conductive paste and its preparation method and application

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Experimental program
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preparation example Construction

[0052] The embodiment of the present application also provides a method for preparing the above-mentioned modified conductive paste, which includes the following steps:

[0053] Step 1. Mixing the carbon-based conductive paste and an organic solvent to form a carbon-based conductive paste solvent, that is, the first solution.

[0054] Mix carbon nanotubes, hyperbranched polyethylene and an organic solvent to disperse carbon nanotubes evenly to form a carbon nanotube / hyperbranched polyethylene mixed solution, that is, the second solution. Usually, carbon nanotubes, hyperbranched polyethylene In the initial mixed solution formed by uniform mixing of ethylene and organic solvent, the concentration of carbon nanotubes is 0.5-500 mg / mL, and the mass ratio of hyperbranched polyethylene to carbon nanotubes is 0.005-10:1.

[0055] In this embodiment, the organic solvent includes at least one selected from the group consisting of chloroform, tetrahydrofuran, petroleum ether and diethyl...

Embodiment 4

[0108] The difference of embodiment 4-10 is that the kind of added carbon nanotube is different, what embodiment 4 adopts is common single-walled carbon nanotube SWCNT, and what embodiment 5-7 adopts respectively is double-walled carbon nanotube DWCNT , multi-walled carbon nanotube MWCNT, highly conductive multi-walled carbon nanotube HEMWCNT, what embodiment 8-10 adopted is the multi-walled carbon nanotube MWCNT that is connected with functional group. Among them, the price of single-walled carbon nanotubes SWCNT is the most expensive, and the modification effect is better. Double-walled carbon nanotubes DWCNT and multi-walled carbon nanotubes MWCNT can be well combined with carbon-based conductive paste with the help of hyperbranched polyethylene HBPE. Compatibility, can greatly improve the conductivity of carbon-based conductive paste; compared with the above-mentioned carbon nanotubes, HEMWCNT, a highly conductive multi-walled carbon nanotube, can be greatly improved with a...

Embodiment 1

[0123] The difference between embodiment 1 and embodiment 11 is that the amount of added carbon nanotubes is different, Figure 4 The left figure in is the LED bulb luminance figure of the modified conductive paste of embodiment 1, Figure 4 The right figure in the middle is the LED bulb luminance figure of the modified conductive paste of embodiment 11. Such as Figure 4 As shown, the part of the black ball and connected with the wire is a modified conductive paste, which can be molded into various shapes at room temperature. The LED bulb uses a series circuit, so in Figure 4 The part circled in the middle is the brightness of the bulb in the normal circuit, and the dark part is the brightness of the bulb corresponding to the modified conductive paste; comparing the brightness of the LED bulb in the left and right pictures, it can be clearly observed Figure 4 The brightness of the LED bulb in the middle right picture is higher, that is, as the content of carbon nanotubes ...

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Abstract

The embodiment of the invention provides modified conductive paste and a preparation method and application thereof, and relates to the field of conductive paste. The modified conductive paste comprises the following raw materials in percentage by mass: 1%-90% of carbon-based conductive paste, 5%-60% of carbon nanotubes and 5%-50% of hyperbranched polyethylene, wherein a three-dimensional conductive network is formed among the carbon-based conductive paste, the carbon nanotubes and the hyperbranched polyethylene. The preparation method of the modified conductive paste mainly comprises the following steps: mixing carbon-based conductive paste with an organic solvent to form a first solution; mixing carbon nanotubes, hyperbranched polyethylene and an organic solvent, and uniformly dispersingthe carbon nanotubes to form a second solution; and uniformly mixing the first solution and the second solution, and removing the organic solvent. The modified conductive paste is high in conductivity and low in cost, and can be made into wires; and the preparation conditions are mild, the process is simple, efficient and environment-friendly.

Description

technical field [0001] The application relates to the field of conductive paste, in particular, to a modified conductive paste and its preparation method and application. Background technique [0002] Although metal materials are used as conductive materials everywhere in life, metal materials also have unavoidable shortcomings as conductive materials. For example, due to the large current value per unit area of ​​the wire, metals with high melting points and low resistivity are generally used as conductive materials to make wires. Processing metal materials that meet the needs of use will not only consume a lot of energy but also cause environmental damage. Great pollution. Therefore, it is imminent to develop materials that are easy to process, low in cost, pollution-free and have excellent electrical conductivity. [0003] Current research has found that carbon-based conductive paste has certain conductivity. The main components of carbon-based conductive paste are adhe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/24H01B13/00
CPCH01B1/24H01B13/00
Inventor 徐立新张博远张高乐周康
Owner ZHEJIANG UNIV OF TECH
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