Special-purpose low temperature solidification silver migration resistance laser etching conductive silver paste for handset touch screen and preparation method thereof

A technology of conductive silver paste and laser etching, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as device short circuit, open circuit failure, and complete machine failure, and achieve improved contact Effects of denaturation, reduced dosage, and enhanced binding

Inactive Publication Date: 2016-11-23
NANO TOP ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Silver migration is a phenomenon that has always existed in the field of conductive silver paste. Once it occurs, it will lead to short circuit and open circuit failure of the device, which will lead to the failure of the whole machine.

Method used

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  • Special-purpose low temperature solidification silver migration resistance laser etching conductive silver paste for handset touch screen and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] The silver paste is prepared through three process steps of preparation of polymer resin carrier, preparation of conductive silver paste and post-treatment of conductive silver paste.

[0029] Step 1, preparation of polymer resin carrier.

[0030] First by weighing 40% low-molecular-weight polyester resin (relative molecular mass is 15000) by mass percentage and mixes with 60% diethylene glycol ether acetate and diethylene glycol butyl ether acetate mixed solvent, and at 70 ℃ Dissolve completely under; Then take 20% high molecular weight polyester resin (relative molecular mass is 35000) and mix with 80% ethylene glycol ethyl ether according to mass percentage, and dissolve completely at 70 ℃. Finally, the two carriers were weighed and mixed with a mass ratio of 4:1. They were mixed and stirred evenly at 70° C., and the obtained carrier had a viscosity of 6000-7000 cps. The carrier is then filtered to remove impurities on a 600-mesh stainless steel screen to obtain the...

example 2

[0037]The silver paste is prepared through three process steps of preparation of polymer resin carrier, preparation of conductive silver paste and post-treatment of conductive silver paste.

[0038] Step 1, preparation of polymer resin carrier

[0039] First by weighing 40% low molecular weight polyester resin (relative molecular mass is 15000) mixed with 60% diethylene glycol butyl ether acetate by mass percentage, and dissolve completely at 70 ℃; Then weigh according to mass percentage 40% of high molecular weight polyester resin (relative molecular mass is 35,000) is mixed with 60% of ethylene glycol ether acetate, and dissolved completely at 70°C. Finally, the two carriers were weighed and mixed with a mass ratio of 3:16, mixed and stirred evenly at 70°C, and the viscosity of the obtained carrier was 13000-15000cps, and then the carrier was filtered on a 400-mesh stainless steel screen to obtain the final Polymer resin carrier.

[0040] Step 2, preparation of conductive ...

example 3

[0046] The slurry preparation method is similar to example one and two.

[0047] The proportion of each component is: high molecular weight resin-5.26%, low molecular weight resin content-4.06%, ethylene glycol ethyl ether acetate-4.12%, diethylene glycol butyl ether acetate-2.95%, DBE-7.5%, hydroxyethyl ether Base Cellulose-1.5%, Polyamide Wax-0.5%, Dibutyl Phthalate-1%, BYK-R605-0.5%, Benzyl Glycidyl Ether-2.5%, Silicone Oil-1%, Acrylate Flow Leveling agent-0.5%, sodium dodecylsulfonate-1%, fluorine-modified surfactant-0.5%, dodecanoic acid-1.5%, and the remaining components are mixed conductive powder.

[0048] The composition ratio of the mixed silver powder and the conductive carbon black is: micron flake silver powder-75.02%, nanometer anti-silver migration spherical silver powder-18.74%, and nanometer conductive carbon black-6.24%.

[0049] Using Brookfield DV-II viscometer, using No. 28 spindle to measure at 50 rpm, the viscosity is 50000-60000cps. After printing, th...

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Abstract

The invention relates to a special low-temperature curing anti-silver migration laser etching conductive silver paste for a mobile phone touch screen and a preparation method thereof. The main components of the conductive silver paste are as follows: the silver powder content is 40%-75%, the polymer carrier content is 20-50%, and the additive content is 3-15%. The preparation of the slurry includes three steps of preparation of a polymer resin carrier, preparation of a conductive silver paste and post-treatment of the conductive silver paste. The paste has excellent anti-silver migration ability, and the migration rate is greatly reduced in a humid environment. The slurry has excellent laser etching performance, and can etch clear lines with a line width / space of 30μm / 30μm picture case. The slurry has good adhesion on PET, ITO film, ITO glass and ordinary glass. The pencil hardness is above 4H, and the minimum square resistance value can reach 20mΩ / square@1mil. It is compatible with insulating ink and peelable blue glue protective layer. Have good compatibility. In addition, the conductive silver paste is sintered and formed at low temperature, has low production cost, saves energy, does not contain halogen in the paste, and is an environment-friendly product.

Description

technical field [0001] The invention relates to a conductive silver paste, in particular to a low-temperature curing anti-silver migration laser-etching conductive silver paste for a mobile phone touch screen and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, the development of electronic display technology, especially touch screen technology, is unprecedented. These have prompted the development of electronic display products in the direction of miniaturization, miniaturization, light weight, practicality, and environmental protection. With the continuous upgrading and refinement of screen printing technology in recent years, especially the emergence of laser etching technology, it has become possible to obtain micron-scale conductive lines on ITO, ordinary glass and polyester film materials. On this basis, electronic paste has become a key material. [0003] Electronic paste is an electronic functional mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/24H01B13/00G06F3/041H04M1/02
Inventor 刘元哲刘旭徐亮张佑专刘兰兰
Owner NANO TOP ELECTRONICS TECH
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