Lead-free graphene/nano-silver composite electronic silver paste and preparation method thereof

A technology of graphene and nano-silver, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems that do not conform to the social development trend of green environmental protection, and reduce the environment and human body. hazards, simple preparation process, and the effect of reducing solid content

Inactive Publication Date: 2016-09-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the electronic paste used in the market still uses leaded glass powder, which does not conform to the social development trend of green environmental protection, so the development of lead-free silver paste has become the main direction of research

Method used

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  • Lead-free graphene/nano-silver composite electronic silver paste and preparation method thereof
  • Lead-free graphene/nano-silver composite electronic silver paste and preparation method thereof
  • Lead-free graphene/nano-silver composite electronic silver paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 1. Preparation of graphene / nano-silver composite powder

[0069] The graphene / nano-silver composite powder has uniform compounding and good dispersion, the nano-silver powder is silver nanoparticles with a particle size of 0.4 μm, and the mass fraction of the modified graphene is 2%. The preparation steps are as follows:

[0070] (1) Amino modification on the surface of silver nanoparticles:

[0071] Get 5g of silver nanoparticles, ultrasonically disperse it in the mixed solution of 400mL ethanol and deionized water (the volume ratio of deionized water-ethanol is 1:3), after the dispersion is uniform, add 40mL of (3-aminopropyl ) triethoxysilane reagent, in a water bath at 40°C, with magnetic stirring, and react for 6h. The modified silver powder can be obtained by washing with ethanol and deionized water for several times, and then drying in vacuum.

[0072] (2) Carboxyl modification on the surface of graphene:

[0073] Take 500mg of flake graphene powder and ultra...

Embodiment 2

[0088] 1. Preparation of graphene / nano-silver composite powder

[0089] Directly adopt the graphene / nano-silver composite powder with a graphene content of 2% prepared in Example 1.

[0090] 2. Preparation of Organic Binders

[0091] In terms of mass percentage, take by weighing 55% terpineol, 20% dibutyl phthalate, 10% diethylene glycol monobutyl ether, 3% castor oil, 2% polyethylene glycol, 3 % of additives (tributyl phosphate and Span 80, the mass ratio is 1:2), after mixing evenly, heat to 80°C, slowly add 7% ethyl cellulose, dissolve for 50min, and obtain a uniform and transparent organic adhesive mixture.

[0092] 3. Preparation of lead-free glass powder

[0093] Weigh 30% of B by mass ratio 2 o 3 , 45% Bi 2 o 3 , 10% SiO 2 , 5% Al 2 o 3 , 5% ZnO, 5% V 2 o 5 , mixed evenly by ball milling, placed in a crucible, and melted at 1200°C for 2 hours. The obtained glass liquid is quenched in deionized water, and the obtained glass particles are ball-milled and pass...

Embodiment 3

[0097] 1. Preparation of graphene / silver composite silver powder

[0098] Directly adopt the graphene / nano-silver composite powder with a graphene content of 2% prepared in Example 1.

[0099] 2. Preparation of Organic Binders

[0100] In terms of mass percentage, take by weighing 55% terpineol, 20% dibutyl phthalate, 10% diethylene glycol monobutyl ether, 3% castor oil, 2% polyethylene glycol, 3 % of additives (tributyl phosphate and Span 80, the mass ratio is 1:2), after mixing evenly, heat to 100°C, slowly add 7% ethyl cellulose, dissolve for 50min, and obtain a uniform and transparent organic adhesive.

[0101] 3. Preparation of lead-free glass powder

[0102] Weigh 30% of B by mass ratio 2 o 3 , 45% Bi 2 o 3 , 10% SiO 2 , 5% Al 2 o 3 , 5% ZnO, 5% V 2 o 5 , mixed evenly by ball milling, placed in a crucible, and melted at 1400°C for 2 hours. The obtained glass liquid is quenched in deionized water, and the obtained glass particles are ball-milled and passed th...

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Abstract

The invention discloses a lead-free graphene/nano-silver composite electronic silver paste, which is composed of: 55-85% of graphene/nano-silver composite powder; 5-40% of organic binder; lead-free Glass powder 0.5-20%. The graphene/nano-silver composite powder is made by modifying the amino group on the surface of the nano-silver powder, modifying the carboxyl group on the surface of the graphene, and then bonding the graphene and the nano-silver powder together through acid-amine condensation to obtain a well-dispersed composite powder. Powder. The present invention uses graphene/nano-silver composite powder to replace traditional silver powder, which reduces the solid content of silver powder and effectively reduces the cost; the use of lead-free glass powder in the silver paste preparation process greatly reduces the harm to the environment and human body ; The preparation process of the composite electronic silver paste is simple, easy to operate, and beneficial to industrial production.

Description

technical field [0001] The invention relates to the technical field of electronic silver paste, in particular to a lead-free graphene / nano-silver composite electronic silver paste and a preparation method thereof. Background technique [0002] Electronic paste is a key functional material for the production of various electronic components, about 80% of which use silver powder as the main functional phase. From the 1930s, the United States first developed silver conductive paste, which was used to form electrodes on both sides of ceramic capacitors by printing and sintering. Since the silver / palladium paste that appeared in the 1950s was used as a resistor for thick film integrated circuits, it has been 70 years since then. Over the years of development, the application range of slurry has been continuously expanded, and has been widely used in aviation, aerospace, electronic computers, measurement and control systems, communication equipment, medical equipment, automobile i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/24H01B13/00
CPCH01B1/22H01B1/24H01B13/00
Inventor 张建飞段雷程昱川许高杰陈钢强宋财根
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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