Monodisperse nano copper particles used for conductive printing ink and preparation method and purposes thereof

Abstract

The invention relates to a preparation method of nano copper particles. The preparation method comprises the following steps that (1) a protective agent is evenly dispersed into an alcoholic solutionor an aqueous solution of alcohol, then a reducing agent is added, and the solution is stirred evenly; (2) copper precursor is added into the solution obtained in the step (1), the solution is stirredevenly and heated to 70 DEG C, and then the solution is heated for one hour or longer when the color of the solution starts to change; and (3) washing is conducted after the reaction is finished, drying is conducted after sediment is taken out, and the nano copper particles are obtained. In the preparation process, composite chelating agents do not need to be added, middle processes including separation and purification, or activation and sensitization are not needed, and reaction conditions are mild. In addition, the nano copper particles generated through the preparation method are small inparticle size, good in dispersity, high in monodispersity, and great in oxidization resistance, and can be put into mass production and applied to the field of conductive printing ink.

Description

technical field [0001] The invention belongs to the field of metal nanomaterials, and in particular relates to a preparation method of nano copper particles, in particular to a preparation method and application of nano copper particles used in conductive ink. Background technique [0002] Nowadays, with the rapid development of electronic technology, the requirements for the performance of electronic components and equipment are getting higher and higher; as an electronic material with good mechanical and conductive properties and wide application fields, conductive ink is favored by more and more people. [0003] Conductive ink is a new type of functional composite material. A large number of conductive particles in the ink system are evenly dispersed to form a slurry (including solvent) in an insulating state. After the conductive ink is sintered and solidified, it realizes the conductive function under the action of an external electric field. Conductive ink is mainly c...

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Problems solved by technology

The reaction temperature of the sol-gel method is low, the product particles are small, the particle size distribution is narrow and the purity is high, but the cost is high and it is accompanied by pollution; the particles obtained by the hydrothermal reduction method are high in purity, the particle size distribution is narrow, and the crystal lattice growth is complete and pollution-free. However, the ratio and purity of raw materials are high, and it is not suitable for large-scale production; the preparation process of the electrolysis method is relatively simple, but the post-treatment process is relatively cumbersome; the reaction temperature of the plasma method is high, the reaction speed is fast, the operation is simple and the production speed is fast. , but it consumes a lot of energy; compared with other methods, thermal decomposition is faster, more economical and green, but it is not easy to control the particle size and shape of copper particles

The chemical reduction method can obtain nano-copper particles with different particle sizes and shapes by optimizing the process. The reducing agents used are generally sodium borohydride, formaldehyde, hydrazine hydrate or sodium hypophosphite. These reducing agents are expensive, and most of them have relatively high Great toxicity, not conducive to large-scale production

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