Screen printing conductive adhesive with excellent scratch resistance

A technology of screen printing and conductive adhesive, used in conductive coatings, conductive adhesives, adhesives, etc., can solve the problem that it is difficult to achieve high hardness, does not give pencil hardness and bending resistance, and cannot achieve halogen-free. standards, etc.

Active Publication Date: 2013-07-31
苏州毫邦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive adhesive recorded in CN101063027A has excellent conductivity and better adhesion, and has good high temperature and high humidity resistance, but the patent does not provide whether the cured conductive adhesive has scratch resistance, nor does it provide pencil hardness value and bending resistance
However, the vitrification (Tg) of the resin used is low, and the pencil hardness cannot reach 2H
In addition, there are more and more requirements for halogen-free adhesives for electronic purposes. Halogen-free adhesives require that the concentration of Cl (chlorine) in the adhesive be less than 900ppm, the concentration of Br (bromine) be less than 900ppm, and the concentration of Cl+Br be less than 1500ppm. Obviously because of the polyvinyl chloride structure It contains halogens, and it is impossible to meet the halogen-free standard as a conductive adhesive
[0006] Pencil hardness and bending resistance are two parameters with opposite characteristics. The conductive adhesive with high hardness has good scratch resistance, but the coating film is often brittle, and the conductivity drops sharply after the bending test. Therefore, in the actual formulation practice It is difficult to achieve high hardness (above pencil hardness 2H) in the process, and it can also resist bending well

Method used

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  • Screen printing conductive adhesive with excellent scratch resistance

Examples

Experimental program
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Effect test

Embodiment -1

[0029] 【 Example-1 】The polyester resin is commercially available Japan Toyobo VYLON GK-140, the glass transition temperature (Tg) is 20 degrees, and the pencil hardness of the polyester resin body is H. Dissolve 15g of polyester resin in 70g of diethylene glycol monoethylene In the base ether acetate high boiling point solvent, heat to 80 degrees until the resin is completely dissolved and becomes transparent. Add 85g of flake silver powder, 2g of polytetrafluoroethylene micropowder, and 3g of organic bentonite, mix evenly with a planetary mixer, and then grind with a three-roll mill for 3 times. The prepared conductive adhesive is printed on PET polyester film with 80 mesh screen printing to make a test piece with a width of 1 cm and a length of 5 cm. After drying in a blast drying oven at 120 degrees for 30 minutes, test square resistance, bending performance, volume resistance, and pencil hardness. And adhesion (100 grid test). The results are shown in Table 1.

Embodiment -2

[0030] 【 Example-2 】Toyobo VYLON GK-390 is used as the polyester resin, the Tg is 7 degrees, the pencil hardness of the resin body is HB, polyethylene micropowder is used instead of polytetrafluoroethylene micropowder, other raw materials and preparation process are the same as in Example-1.

Embodiment -3

[0031] 【 Example - 3, 4 】The proportion of polyester resin (Binder) and silver powder and the amount of solvent were changed, and the other raw materials and preparation process were the same as in Example-1.

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Abstract

The invention relates to a screen printing conductive adhesive with excellent scratch resistance. The conductive adhesive is composed of 46.6-66.2wt% of flake-shaped silver powder, 7.4-15.5wt% of polyester resin, 22-40wt% of a high-boiling-point solvent, 1.7-2.2wt% of a scratch-resistant auxiliary agent, and 1.1-2.2wt% of an anti-settling agent. The conductive adhesive provided by the invention has good screen printing performance and low-temperature curability. The conductive adhesive has excellent adhesion force and excellent conductivity to ITO glass substrate, ITO polyester film, and the like. The volume resistivity of the adhesive is smaller than 0.5*10<-6>ohm.m, and a square resistance is smaller than 30mohm / square. The conductive adhesive provided by the invention can be widely applied in packaging of electronic elements and assemblies such as light-emitting diode (LED), liquid crystal display (LCD), printed circuit board (PCB), flexible printed circuit (FPC), membrane switches, smart cards, lattice blocks, ceramic capacitors, and the like.

Description

technical field [0001] The invention relates to a conductive adhesive, in particular to a screen-printed conductive adhesive and a conductive coating with excellent anti-scratch properties suitable for ITO glass or PET films, and belongs to the field of conductive coatings. Background technique [0002] Conductive adhesives for screen printing are generally composed of four major types of raw materials, namely conductive adhesive binder (Binder), silver powder, solvent and functional additives. [0003] The conductive adhesive is used to bond the silver powder to the substrate and act as a support. Commonly used organic polymer binders are polyester, polyvinyl acetate, vinyl chloride / vinyl acetate copolymer, poly(meth)acrylate, thermoplastic phenolic resin, polyimide, linear epoxy resin, alkyd resin , polyvinyl butyral and polyurethane. Among them, polyester is polymerized from polyols and polyacids. Different polyols and polyacids can be selected to obtain polyesters with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J9/02C09J167/00C09D5/24C09D167/00
Inventor 郝末兰
Owner 苏州毫邦新材料有限公司
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