Ultraviolet-cured polyurethane-based conductive silver paste and preparation method thereof

A conductive silver paste, polyurethane-based technology, applied in the field of electronic chemicals, can solve the problem of low photoinitiator dosage, achieve the effect of improving electrical conductivity and broad application prospects

Inactive Publication Date: 2015-04-29
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention aims at the shortcomings of the existing UV-curable conductive silver paste, to provide a high-performance UV-curable polyurethane-based conductive silver paste with high conductivity, good flexibility, and low photoinitiator dosage and its preparation method

Method used

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  • Ultraviolet-cured polyurethane-based conductive silver paste and preparation method thereof
  • Ultraviolet-cured polyurethane-based conductive silver paste and preparation method thereof
  • Ultraviolet-cured polyurethane-based conductive silver paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare UV-curable polyurethane-based conductive silver paste according to the following formula:

[0042]

[0043] (1) Preparation of ultrafine spherical silver: 1.70g PVP, 0.50gCTAB and 1.76g ascorbic acid were dissolved in deionized water, and sodium hydroxide was added to adjust the pH to 12.5 to prepare 50ml of reducing solution; 1.70g of AgNO 3 Dissolved in deionized water and diluted to 1.0mol / L, AgNO at 300r / min 3 Add it dropwise into the reducing solution, control the dropping time to 20min, and the reaction temperature to 30°C. After the dropwise addition, continue to react for 30min; centrifuge the reacted suspension (high-speed desktop centrifuge: GT10-1, Beijing Times North Lee Centrifuge Co., Ltd.) at 10,000r / min for 30min, and the centrifuged product was washed once with deionized water, absolute ethanol and acetone; the washed ultrafine spherical silver was dried at 30°C and 0.1mmHg for 48h to prepare ultrafine The fine spherical silver powder is rea...

Embodiment 2

[0048] Prepare UV-curable polyurethane-based conductive silver paste according to the following formula:

[0049]

[0050]

[0051] (1) Preparation of ultrafine spherical silver: 1.70gPVP, 0.50gCTAB and 1.76g ascorbic acid were dissolved in deionized water, and sodium hydroxide was added to adjust the pH to 12.5, and 50ml of reducing solution was prepared; 1.70gAgNO 3 Dissolved in deionized water and diluted to 0.5mol / L, AgNO 3 Add dropwise to the reducing solution, control the dropping time to 10min, and the reaction temperature to 50°C, continue to react for 20min after the dropwise addition is completed; centrifuge the reacted suspension (high-speed desktop centrifuge: GT10-1, Beijing Times North Lee Centrifuge Co., Ltd.) at 10,000r / min for 30min, and the centrifuged product was washed once with deionized water, absolute ethanol and acetone; the washed ultrafine spherical silver was dried at 50°C and 0.1mmHg for 24h to prepare ultrafine The fine spherical silver powd...

Embodiment 3

[0056] Prepare UV-curable polyurethane-based conductive silver paste according to the following formula:

[0057]

[0058] (1) Preparation of ultrafine spherical silver: 6.40gPVP, 0.05gCTAB and 1.76g ascorbic acid were dissolved in deionized water, and sodium hydroxide was added to adjust the pH to 12.0, and 50ml of reducing solution was prepared; 1.70gAgNO 3 Dissolved in deionized water and diluted to 1.0mol / L, AgNO at 200r / min 3 Add it dropwise to the reducing solution, control the dropping time to 30min, and the reaction temperature to 0°C. After the dropwise addition, continue to react for 60min; centrifuge the reacted suspension (high-speed desktop centrifuge: GT10-1, Beijing Times North Lee Centrifuge Co., Ltd.) at 8000r / min for 30min, and the centrifuged product was washed once with deionized water, absolute ethanol and acetone; the washed ultrafine spherical silver was dried at 30°C and 0.1mmHg for 48h to prepare ultrafine The fine spherical silver powder is ready ...

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Abstract

The invention discloses an ultraviolet-cured polyurethane-based conductive silver paste and a preparation method thereof. The preparation method comprises the following steps: heating an active monomer to 40-60 DEG C, dissolving a photoinitiator in the active monomer, cooling to 20-35 DEG C, mixing the active monomer with superfine spherical silver, after ultrasonic dispersion, sequentially adding a polyurethane prepolymer and flake-like silver powder, stirring and grinding to obtain conductive silver paste, wherein the conductivity of the ultraviolet-cured silver paste is 7.59*10<5>S/m to 1.32*10<6>S/m, and the conductivity of the ultraviolet-cured silver paste is still 7.82*10<4>S/m to 3.38*10<5>S/m after a bending test is performed for ten times. The ultraviolet-cured polyurethane-based conductive silver paste prepared by adopting the preparation method is high in conductivity, excellent in flexibility, strong in adhesive force to a polyethylene glycol terephthalate base material, and less in dosage of the photoinitiator, and can be widely applied to flexible printed circuits such as a keyboard, a mobile phone, a flat computer and a digital camera.

Description

technical field [0001] The invention relates to the field of electronic chemicals, in particular to an ultraviolet-curable polyurethane-based conductive silver paste and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, electronic equipment is constantly moving towards the direction of miniaturization, intelligence, environmental protection and low cost, prompting people to continuously research, develop and apply more advanced and cheap electronic circuit boards, electronic components and other manufacturing technology. Fully printed electronic technology is a new type of electronic product manufacturing technology. It uses the advantages of printing to organically integrate electronic equipment from component manufacturing, circuit production to component packaging, so as to manufacture high-quality products more efficiently and environmentally friendly. High-performance, low-cost electronic produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00C08G18/76C08G18/67C08G18/66C08G18/48C08G18/12
Inventor 曾幸荣黄俊鹏曾建伟赖学军李红强闫增阳周传玉
Owner SOUTH CHINA UNIV OF TECH
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