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A kind of highly stable particle-free silver-based conductive ink and preparation method thereof
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A conductive ink, particle-free technology, applied in inks, household appliances, applications, etc., can solve the problems of ink deterioration and delamination, ink discoloration and decomposition, silver particles precipitation, etc., and achieves a simple preparation method, good conductivity, and improved stability. sexual effect
Active Publication Date: 2018-03-16
深圳市东陶新材料有限公司
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This is because silver is sensitive to light and the solvent of silver-based conductive ink without particles is usually a weak reducing agent. Higher temperature or exposure to light will cause the ink to change color and decompose, and silver particles will precipitate out. The ink will deteriorate and delaminate. If used It will also clog the nozzle during printing, thus losing the advantage of particle-free silver-based ink
Therefore, particle-free silver-based conductive inks often need to be stored in a place protected from light and low temperature. Its short shelf life and low temperature and light-proof storage requirements bring many unnecessary problems to the commercial production, storage and transportation of particle-free silver-based conductive inks. trouble
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Embodiment 1
[0022] High stability particle-free silver-based conductive ink, composed of 30.02% silver acetate, 0.08% copper oxide, 18% ammonia water and 51.9% ethanol according to mass percentage. The preparation method is:
[0023] Dissolve ammonia water in ethanol according to the above ratio, mix evenly, add silver acetate and copper oxide to the mixture, stir at 10°C for 3 h until dissolved, then filter to obtain the high-stability particle-free silver of this example Based on the conductive ink, the viscosity is 1.9 mPa s, the surface tension is 30 mN / m; the conductive ink is spin-coated on the PET substrate, heat-treated at 150 °C for 10 min, and the film resistivity is 3.2 μΩ cm.
Embodiment 2
[0025] High stability particle-free silver-based conductive ink, composed of 45% silver oxalate, 0.05% copper oxalate, 14% ethylenediamine and 40.95% isopropanol according to mass percentage. The preparation method is:
[0026] Dissolve ethylenediamine in isopropanol according to the above ratio, mix evenly, add silver oxalate and copper oxalate to the mixture, stir at 25°C for 0.5 h until dissolved, and filter to obtain the high stability of this example The particle-free silver-based conductive ink has a viscosity of 20.9 mPa s and a surface tension of 25 mN / m; the conductive ink is scraped onto a PET substrate and heat-treated at 130 °C for 30 min, and the film resistivity is 5.2 μΩ cm .
Embodiment 3
[0028] High stability particle-free silver-based conductive ink, composed of 40% silver butyrate, 1% nickel nitrate, 37% isopropylamine, 15% methanol and 7% ethylene glycol according to mass percentage. The preparation method is:
[0029] Dissolve isopropylamine in the mixed solution of methanol and ethylene glycol according to the above ratio, and after mixing evenly, add silver butyrate and nickel nitrate to the mixed solution, stir at 0°C for 8 h until dissolved, and then filter to obtain this example The highly stable particle-free silver-based conductive ink has a viscosity of 2.5 mPa s and a surface tension of 23 mN / m; the conductive ink wire rod is coated on a glass substrate, and heat-treated at 200 °C for 5 min, the film resistivity is 9 μΩ·cm.
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Abstract
Provided is high-stability particle free type silver-based conductive ink and preparation method thereof. The conductive ink is composed of a silver precursor, other precursors, chelating agents or complexing agents and a solvent, wherein the mass percentage of the silver precursor, the mass percentage of the other precursors, the mass percentage of the chelating agents or complexing agents and the mass percentage of the solvent are 10-45%, 0.05-1%, 10-81.5% and 8-79.5% respectively. The preparation method comprises the steps that the chelating agents or complexing agents are dissolved in the solvent according to the proportion firstly and are evenly mixed, then the silver precursor and the other precursors are added to the mixed liquid, stirring is carried out under 0-25 DEG C for 0.5-12h until the mixtures are solved, and the high-stability particle free type silver-based conductive ink is obtained after filtration. The high-stability particle free type silver-based conductive ink is free of sediment for one month if being stored under natural light, is free of sediment for three months if being stored in a dark place under room temperature, and is free of sediment for six months if being stored in a dark place under low temperature. The viscosity of the ink is 1-1000mPa.s, and the surface tension of the ink is 20-50mN / m.
Description
technical field [0001] The invention belongs to the technical field of conductive ink, in particular to a high-stability particle-free silver-based conductive ink and a preparation method thereof. Background technique [0002] Conductive ink is an important innovation in the field of microelectronics technology in recent years, and can be applied to flexible circuit boards (FPCB), sensor radio frequency identification (RFID), printed circuit boards (PCB), organic light-emitting diodes (OLED), etc. Printing with conductive ink has the characteristics of low cost, low energy consumption, low pollution, high efficiency, large area, and flexible manufacturing. [0003] Silver is the metal with the best conductivity among all metals, and it is the cheapest precious metal. It is chemically inert and not easy to be oxidized, so it is favored in the research of conductive ink. [0004] Silver-based conductive ink can be divided into two types: particle type and particle-free type. ...
Claims
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