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Dual-function electric conduction silver paste for touch screen and preparation method and application thereof

A conductive silver paste and touch screen technology, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of cumbersome procedures, low utilization of materials and man-hours, and reduced production costs. Achieve the effects of high adhesion strength, complete silver electrode wire functionality, and high yield

Active Publication Date: 2015-03-25
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production process of touch screens, it is necessary to use suitable silver paste types according to different preparation processes. The process of replacing different batches of products is cumbersome, and the utilization rate of materials and working hours in production is not high, which is not conducive to the reduction of production costs.

Method used

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  • Dual-function electric conduction silver paste for touch screen and preparation method and application thereof
  • Dual-function electric conduction silver paste for touch screen and preparation method and application thereof
  • Dual-function electric conduction silver paste for touch screen and preparation method and application thereof

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preparation example Construction

[0035] The preparation method of the conductive paste of the embodiment of the present invention comprises the following steps:

[0036] (1) preparing an organic carrier, further comprising the steps of:

[0037] (1-1) The molecular weight is lower than 600 terminal hydroxyl linear alcohol polyester as the monomer of the structural resin, in N 2 Heating and stirring under air protection, react polyester and TDI at 40-60°C for 1-1.5 hours, add organic solvent, after the prepolymer is dissolved, add chain extender R(OH)x dropwise, and react The temperature rises to 70-90°C, and when the viscosity of the system reaches the required value, the reaction is stopped with alcohol to obtain a modified polyurethane with a number-average molecular weight of 8,000-12,000;

[0038] (1-2) Modified polyurethane, latent curing agent and diluent are dispersed by a high-speed disperser to prepare an organic vehicle.

[0039] (2) preparing a dual-functional conductive silver paste for a touch ...

Embodiment 1

[0042] in N 2 Heating and stirring under the protection of air, react the hydroxy-terminated neopentyl alcohol polyester and TDI at 40°C for 1.25 hours, add tetrahydrofuran / tert-butyl methyl ether (V:V=3:1), after the prepolymer is dissolved, drop Add chain extender pentaerythyl glycol, and raise the reaction temperature to 80°C, stop the reaction with alcohol when the viscosity of the system reaches the required value, and obtain a modified polyurethane with a number average molecular weight of 8000;

[0043] The latent curing agent blocked polyisocyanate (DesmodurBL) is added to the modified polyurethane with a molecular weight of 8000 at an active hydroxyl equivalent ratio of 1:1, and dibutyltin dilaurate with a curing agent of 1wt‰, and diluent DBE / 150# (V : V=7:3), the organic vehicle was prepared after being dispersed by a high-speed disperser.

[0044] Weigh raw materials according to the following mass percentage: 73% bulk density is 2.0g / cm 3 , The tap density is 4....

Embodiment 2

[0047] in N 2 Heat and stir under the protection of air, react the hydroxyl-terminated neopentyl alcohol polyester and TDI at 50°C for 1 hour, add tetrahydrofuran / dimethylformamide (V:V=2:1), after the prepolymer is dissolved, Add the chain extender trimethylolpropane dropwise, raise the reaction temperature to 70°C, stop the reaction with alcohol when the viscosity of the system reaches the required value, and obtain a modified polyurethane with a number average molecular weight of 10,000;

[0048] The latent curing agent blocked polyisocyanate (DesmodurBL) is added to the modified polyurethane with a molecular weight of 10000 at an active hydroxyl equivalent ratio of 1.4:1, and dibutyltin dilaurate with a curing agent of 1wt‰, and diluent DBE / 70# (V : V=7:3), the organic vehicle was prepared after being dispersed by a high-speed disperser.

[0049] Weigh raw materials according to the following mass percentage: 60% bulk density is 1.1g / cm 3 , The tap density is 3.2g / cm 3 ...

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Abstract

The invention discloses dual-function electric conduction silver paste for a touch screen and a preparation method and application thereof. The silver paste can meet the requirement for the two touch screen preparation technologies of silk screen hairline printing and laser ablation at the same time. The silver paste comprises, by weight, 60%-73% of micron order flaky silver powder, 5%-10% of nano silver powder, 15%-20% of organic carriers, 1%-9% of function auxiliaries and 1%-5% of functional filler. The manufacturing method of the paste includes the carrier synthesis step and the silver paste preparation technology step. The electric conduction silver paste obtained through the method can powerfully adhere to an ITO (In2O3:SnO2) thin film or a glass base material in a medium and low temperature curing mode, the damage of thermal stress to the ITO thin film and an adhesive layer is effectively avoided, and production energy consumption is lowered; a cured silver paste electrode has a good electrical property, and the interface contact resistance between the silver paste electrode and the ITO layer is low. Compared with traditional touch screen silver paste, the production efficiency of the silver paste is effectively improved, the silk-screen line width is stable, laser ablation is clean, the yield is high, and the production cost of the touch screen is lowered obviously.

Description

technical field [0001] The invention belongs to the technical field of photoelectric information material preparation, and more specifically relates to a dual-function conductive silver paste for a touch screen and a preparation method and application thereof. Background technique [0002] Touch screens originated in the 1970s, and were mostly installed in industrial or commercial equipment such as industrial computers and POS terminals in the early days. The launch of smart phones has become a milestone in the development of the touch screen industry, endowing users with a more direct and convenient operating experience, increasing the intimacy of direct human-computer interaction, and arousing consumers' enthusiastic pursuit. The journey towards the mainstream control interface. As the most widely used and most outstanding touch technology solution, capacitive touch screen has become the main force supporting the growth of the industry. [0003] Printed electronic device...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00
Inventor 李俊鹏陈家林王鸣魁郭金山李世鸿熊庆丰李文琳梁云周利民莫建国
Owner KUNMING INST OF PRECIOUS METALS
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