Special ultralow temperature cured laser etching conductive silver paste for mobile phone touch screen

A technology of conductive silver paste and laser etching, which is applied in the direction of carbon-silicon compound conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of time-consuming, energy, substrate deformation, and adding materials, etc., to achieve The effects of enhanced binding, improved thixotropy, and reduced dosage

Active Publication Date: 2018-05-11
NANO TOP ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The current curing temperature of conductive silver paste is above 130°C. If this temperature is used to cure, the base material needs to undergo high-temperature aging treatment, which consumes time and energy, and is easy to deform and wrinkle the base material during the operation process, and increases the operating time. Probability of material scratches and contamination

Method used

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  • Special ultralow temperature cured laser etching conductive silver paste for mobile phone touch screen

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] 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.

[0033] Step 1, preparation of polymer resin carrier.

[0034] First take by mass percentage the epoxy resin of 40% (relative molecular mass is 15000) mix with 60% diethylene glycol ether acetate and diethylene glycol butyl ether acetate mixed solvent, and dissolve at 70 ℃ complete; then weigh 20% polyester resin (relative molecular mass: 35,000) and mix with 80% ethylene glycol ether according to mass percentage, and dissolve completely at 70°C. 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 final polymer resin carrier.

[0035] Step 2, preparation of cond...

example 2

[0041] 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.

[0042] Step 1, preparation of polymer resin carrier

[0043] First take by mass percentage the epoxy resin of 40% (relative molecular mass is 15000) mix with 60% diethylene glycol butyl ether acetate, and dissolve completely at 70 ℃; Then take by mass percentage 40% The polyester resin (relative molecular mass is 35000) is mixed with 60% 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.

[0044] Step 2, preparation of conductive silver paste.

[0045] Take by weight 62% mixed silver powder...

example 3

[0050] The slurry preparation method is similar to example one and two.

[0051] The proportion of each component is: polyester resin-5.26%, epoxy 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 - 0.5%, mercaptothiol curing agent - 0.5%, fluorine modified surfactant - 0.5%, dodecanoic acid - 1.5%, the remaining components are mixed conductive powder .

[0052] The composition ratio of the mixed silver powder and the conductive carbon black is: micron flake silver powder-75.02%, nano-spherical silver powder-18.74%, and nano-conductive carbon black-6.24%.

[0053] Using Brookfield DV-II viscometer, using No. 28 spindle to measure at 50 rpm, the viscosity is 50000-60000cps. After printing, the thickness of t...

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Abstract

The invention relates to a special ultralow temperature cured laser etching conductive silver paste for a mobile phone touch screen. The conductive silver paste mainly comprises the following components: 40%-75% of a conductive function phase, 6-15% of macromolecule resin, 15-35% of a solvent and 3-15% of an additive. The preparation of the silver paste comprises the steps of macromolecule regioncarrier preparation, conductive silver paste preparation and conductive silver paste post-processing. The conductive silver paste can be completely cured under the condition of an ultralow temperatureof 80-110 DEG C, the temperature is reduced by 20-50 DEG C compared with a curing condition of 130 DEG C of the existing conductive silver paste, and shrinkage, folding and deformation of a substratemembrane material during high-temperature curing are reduced. The paste has excellent laser etching performance, and a clear pattern with the line width / line spacing being 30 microns / 30 microns can be etched; the paste has good adhesion on PET, an ITO film, a silver nanowire conductive film, TIO glass and ordinary glass, the pencil hardness is above 2H, and the square resistance can reach up to 20m[Omega] / square@1mil. In addition, the conductive silver paste is sintered and molded at an ultralow temperature, low in production cost, energy-saving and free of halogen, thereby being an environment-friendly product.

Description

technical field [0001] The invention relates to a conductive silver paste, in particular to an ultra-low temperature curing laser-etched conductive silver paste dedicated to a touch screen of a mobile phone. 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 prepare 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 material, mainly used in carbon film p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/24H01B1/02H01B1/04H01B13/00
CPCH01B1/02H01B1/04H01B1/22H01B1/24H01B13/00
Inventor 刘元哲闫锦爽刘兰兰徐亮刘旭顾潇飞
Owner NANO TOP ELECTRONICS TECH
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