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Preparation method of conductive micro-sphere applicable to conductive material

A technology of conductive materials and microspheres, which is applied in the field of preparation of composite microspheres containing conductive metals, can solve the problems of ineffective surfactants, unrepeatable dispersion effects, unreliable conductive microspheres, etc.

Active Publication Date: 2014-04-09
SUZHOU NANOMICRO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The method commonly used to solve the agglomeration of conductive gold balls during the formation of gold layers is to use surfactants. Chinese patent CN 102352495A discloses a method for preparing conductive gold balls. When the gold layer is directly formed on the surface of resin balls, surfactants are used. Hexaalkyltrimethylammonium bromide, but the effect of surfactant is not obvious, and even a small amount of use will affect the redox reaction of electroless plating, resulting in poor conductivity of the gold layer, and the resistance increases with time, so the formed conductive microspheres in Unreliable in the application environment
Chinese patent CN102977395A discloses a preparation method of conductive material composite microspheres, which uses alcohol amine compounds to directly form a nickel layer on the surface of resin balls, but its dispersion effect cannot be repeated in the preparation of forming a gold layer on the surface of nickel balls, so it is urgently needed Find an effective preparation method that can solve the problem of agglomeration of gold-containing composite microspheres

Method used

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  • Preparation method of conductive micro-sphere applicable to conductive material
  • Preparation method of conductive micro-sphere applicable to conductive material
  • Preparation method of conductive micro-sphere applicable to conductive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Step 1, preparing 6.75 μm matrix material microspheres, that is, the polymer core of the composite microspheres

[0053] Take 13.1g of 26.0% polystyrene seed suspension solution with a particle size of 2.1μm, 450g of deionized water, and 0.23g of 10% sodium dodecylbenzenesulfonate aqueous solution into a 2000mL four-necked round-bottomed flask, blow in nitrogen, and stir Then heated to 60°C. Take 18.8g divinylbenzene, 123.8g 1,6-hexanediol diacrylate, 7.5g allyl methacrylate, 10.7g 10% sodium dodecylbenzenesulfonate aqueous solution, 165g deionized water, after mixing Stir with a homogeneous mixer and add to a four-neck round bottom flask. After stirring for 2 hours, cool down to 40 °C and add 0.2 g of 30% hydrogen peroxide. Take 1.1g of tert-butyl hydroperoxide, 0.3g of 10% sodium dodecylbenzenesulfonate aqueous solution, 65g of deionized water, mix them with a homogeneous mixer, add them to a four-necked round bottom flask, and then add 56.3g of 20% Polyvinylpyrrol...

Embodiment 2

[0055] Step 2, Synthesis of Polymer Microspheres with Polymer Exterior

[0056] Take 400.0g of the microsphere suspension obtained in Example 1 with 15.4% removal of small particles, and 150g of deionized water, add it to a 2000mL four-neck round bottom flask, blow in nitrogen, stir and heat to 70°C. Take 0.08g of sodium formaldehyde sulfoxylate, 0.36g of 10% sodium dodecylbenzenesulfonate aqueous solution, mix with 25.6g of deionized water to form a uniform solution, and add 13.0g of the uniform solution into a round bottom flask. Take 0.11g of tert-butyl hydroperoxide and mix it with 12.9g of deionized water to form a uniform solution. Take 2.8g methyl methacrylate, 11.5g glycidyl methacrylate, 0.03g 1,6-hexanediol diacrylate, and mix them into a homogeneous monomer solution. Add 1.0 g of each of the two aqueous solutions every 15 minutes, and the total addition time is 180 minutes. Add 1.3 g of the above monomer solution every 15 min for a total addition time of 150 min. ...

Embodiment 3

[0058] Step 3, generating functional groups outside the polymer microspheres, i.e. functionalizing the polymer microspheres obtained in Example 2

[0059]Take 100.0g of the microsphere suspension obtained in Example 2 and 200mL of absolute ethanol, add it into a 500mL round bottom flask, stir magnetically to disperse, then take 50mL of ethylenediamine, and add it into the round bottom flask. Heat to 80°C for 12 hours. Cool the flask to 25° C., filter and separate to obtain functionalized microspheres, that is, functional parts are formed on the inner core, and the functional parts are composed of high molecular polymers and have functional groups.

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Abstract

The invention provides a preparation method of a conductive micro-sphere applicable to a conductive material. The preparation method comprises the steps that a polymer composite micro-sphere with a functionalized external part and at least one metal conductive layer contacts a quaternary phosphate compound, and at least one metal conductive layer is formed at the outer layer of the composite micro-sphere in the environment of quarter phosphoric acid salt. The preparation method has the beneficial effects that the formed conductive composite micro-sphere is easily dispersed and is not easily reunited, and can be evenly distributed into various application media. Thus, the conductive composite micro-sphere has good conductivity, and the problem of negative effects on the conductivity caused by resistance rising due to poor contact of a microelectrode subjected to hot-pressing is solved.

Description

technical field [0001] The invention relates to a conductive material, in particular to a method for preparing conductive metal-containing composite microspheres suitable for conductive materials. Background technique [0002] Conductive materials are widely used in the field of electrical connection between micro-electrodes of electronic equipment. The main conductive connection is composed of conductive composite microspheres, which can be used directly, such as distributed between the micro-electrodes of the upper and lower borders of a flat-panel display; Conductive composite microspheres can also be dispersed in an insulating resin binder to form an anisotropic conductive material, and then used to bond and electrically connect microelectrodes of electronic devices. With the change of market demand, microelectrodes are gradually shrinking and the display area of ​​flat-panel displays is gradually increasing, and the performance requirements for conductive composite micr...

Claims

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Application Information

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IPC IPC(8): B01J13/02C23C18/31
Inventor 江必旺吴俊成陈荣姬朱咸浩
Owner SUZHOU NANOMICRO TECH CO LTD