Bi-component low-temperature fast-drying aquadag and production process thereof

Abstract

The invention relates to two-component low temperature fast dry graphite emulsion and the production process, belonging to the electronic technical field which produces the conductive rubber press-key and the novel conductive contact material used for the PCB. The composition is divided into the first component graphite emulsion and the second component graphite emulsion; the first component graphite emulsion contains microcrystalline graphite powder, styrene, ethylene-vinyl acetate copolymer emulsion and titanium dioxide powder; the second component graphite emulsion contains microcrystalline graphite powder, benzoyl peroxide, dibutyryl and ethylene-vinyl acetate copolymer emulsion. The first component and the second component graphite emulsions are used for stirring and coating with the weight ratio of 1:1; in the two-component low temperature fast dry graphite emulsion and the production process, the graphite emulsion is printed or coated on silicon rubber or PCB substrate to have the advantages of good film conductive performance, ink silk-screen printing of the silicon rubber, direct shift printing and coating of the silicon rubber, good fluidity of the emulsion, short time in drying and curing, preventing the air holes of the conductive film, avoiding the high-power ultraviolet lamp for curing and low power consumption.

Description

technical field [0001] The invention relates to a two-component low-temperature quick-drying graphite emulsion, which is an indispensable chemical material for manufacturing printed circuit boards of products such as calculators, electronic pianos, telephones, remote controls and keyboards. The invention also proposes a production process for producing the graphite milk. Background technique [0002] Graphite emulsion, also known as conductive carbon paste and conductive ink, is suitable for full-page printing, connecting or jumpering lines by screen printing. Composed of selected imported brand-name resin and other materials, it has excellent electrical conductivity, wear resistance, and stable performance. Graphite emulsion has been widely used in various industries in the electronics industry. Such as: conductive carbon film printed circuit board, conductive button printed circuit board, flexible PCB and membrane switch, etc. These conductive elements are printed on sil...

AI Technical Summary

Problems solved by technology

The particles in the ink will also block the plate, so that the screen printing cannot continue; UV conductive ink needs to be cured with a high-power ultraviolet lamp before it can be pasted on the silicone rubber. The drying and curing time is long, and the irradiation conditions change slightly. It is easy to produce pores in the conductive film, and the resulting adhesion and wear resistance are significantly different, causing the cured carbon film to crack and fall off

[0003] Hyperion Catalysis International Co., Ltd. of the United States proposed a "conductive micro-carbon fiber-based ink and coating" (Patent No. 03819456.2) to the China Intellectual Property Office on June 16, 2003. The conductive ink of this invention contains micro-fine carbon fibers, liquid media, Polymer binder, due to the use of fine carbon fibers, mainly focuses on solving ink fluidity, and the viscosity strength of ink has no substantial change from ordinary UV conductive ink

And using this kind of ink or paint printing operation, its drying and curing time is still very long