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Method for preparing monodisperse silver-coated microspheres for anisotropic conductive adhesive

An anisotropic, monodisperse technology, applied in the field of preparation of monodisperse silver-plated microspheres, can solve the problems of living environment and safety hazards, high operating temperature, high glass transition temperature, etc. The effect of simplicity and simple preparation method

Inactive Publication Date: 2011-10-05
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] First, the trend toward miniaturization and portability of electronic products is becoming stronger and stronger, which requires higher and higher integration of semiconductor chips. As a result, the number of input and output ports (I / O) per unit area of ​​electronic components is increasing. The more traditional Pb / Sn solders can only be applied to connections with a pitch greater than 0.65mm due to poor wettability with organic materials, poor creep resistance, and high density, they cannot adapt to the development requirements of modern electronic products that are light, portable, and small
[0004] Second, Pb / Sn solder has a high operating temperature (>230°C), which is prone to damage to components and substrates due to thermal stress
[0005] Third, Pb / Sn solder contains toxic substances such as lead and lead compounds, and long-term use will cause non-negligible dangers to human living environment and safety
Literature [Functional Polymer Materials, 2004, 17, 113] introduces a method for preparing monodisperse MF microspheres by aqueous phase dispersion polymerization. The process is simple and the cycle is short (about 40min). The resulting MF microspheres have good monodispersity, Low density, high glass transition temperature, and because MF microspheres have active groups on the surface, it is beneficial to simplify the subsequent electroless plating process and improve the bonding force of the coating. It is an ideal cue ball for ACA conductive fillers. So far, there is no follow-up application report of MF microspheres, and its application research in ACA is blank, which is the starting point and purpose of the present invention

Method used

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  • Method for preparing monodisperse silver-coated microspheres for anisotropic conductive adhesive
  • Method for preparing monodisperse silver-coated microspheres for anisotropic conductive adhesive
  • Method for preparing monodisperse silver-coated microspheres for anisotropic conductive adhesive

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Embodiment 1

[0040] The present invention relates to a kind of preparation method of silver-plated melamine formaldehyde resin microsphere, and concrete implementation steps are as follows:

[0041] (1) Preparation of monodisperse melamine-formaldehyde resin microspheres: measure 2.8 g of melamine, 2 mL of formaldehyde solution (37%, at this time the molar ratio of melamine to formaldehyde is about 1:1), and 9 mL of deionized water in a reaction vessel, add Adjust the pH to 9 with an appropriate amount of anhydrous sodium carbonate, heat to 50°C, stir until the reaction becomes clear, and record it as A; the prepared concentration is 4.6×10 -3 g / mL PVA solution, take 90mL and add it to solution A, adjust the pH of the solution to 3 with dilute hydrochloric acid, heat to 60°C, stir and react until the particle size of the microspheres no longer changes (observed with an optical microscope, about 1.5µm, see figure 1 ), centrifuged, washed three times with deionized water, and dried at 60°C ...

Embodiment 2

[0047] The present invention relates to a kind of preparation method of silver-plated melamine formaldehyde resin microsphere, and concrete implementation steps are as follows:

[0048] (1) Preparation of monodisperse melamine-formaldehyde resin microspheres: measure 2.8 g of melamine, 13 mL of formaldehyde solution (37%, at this time the molar ratio of melamine to formaldehyde is about 1:7), and 13 mL of deionized water in a reaction vessel, add Adjust the pH to 9 with an appropriate amount of anhydrous sodium carbonate, heat to 50°C, stir until the reaction becomes clear, and record it as A; the prepared concentration is 4.6×10 -3 g / mL PVA solution, take 95mL and add it to solution A, adjust the pH of the solution to 6 with dilute hydrochloric acid, heat to 60°C, stir and react until the particle size of the microspheres no longer changes (observed with an optical microscope, about 2.5 μm), centrifuged, washed three times with deionized water, and dried at 60°C to obtain the...

Embodiment 3

[0054] The present invention relates to a kind of preparation method of silver-plated melamine formaldehyde resin microsphere, and concrete implementation steps are as follows:

[0055] (1) Preparation of monodisperse melamine-formaldehyde resin microspheres: Measure 2.8 g of melamine, 6 mL of formaldehyde solution (37%, at this time the molar ratio of melamine to formaldehyde is about 1:3.3), 90 mL of deionized water in a reaction vessel, add Adjust the pH to 9 with an appropriate amount of anhydrous sodium carbonate, heat to 50°C, stir until the reaction becomes clear, and record it as A; the prepared concentration is 4.6×10 -3 g / mL PVA solution, take 150mL and add it to solution A, adjust the pH of the solution to 4.5 with dilute hydrochloric acid, heat to 60°C, stir and react until the particle size of the microspheres no longer changes (observed with an optical microscope, about 0.6 μm), centrifuged, washed three times with deionized water, and dried at 60°C to obtain the...

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Abstract

The invention relates to a method for preparing monodisperse silver-coated microspheres, and belongs to the fields of silver-coated microspheres, electronic connecting materials and the like. The method comprises the following steps of: preparing monodisperse melamine formaldehyde resin (MF) microspheres by using a dispersion polymerization method; roughing, sensitizing, activating and chemically plating a nickel metal and a silver metal by taking the microspheres as mother spheres so as to obtain the monodisperse silver-coated MF microspheres. The MF mother spheres have the advantages of simple and reliable preparation process, high efficiency, controllable grain size, good monodispersibility and the like. Because the MF microspheres contain active groups such as amino acid, hydroxyl and the like, the coat is complete and high in binding force, the grain size of the silver-coated microspheres can be controlled in a range of 1.0-3.9mu m, the dispersion coefficient epsilon is 0.045-0.067, the monodispersibility is high, the decomposition temperature is about 300DEG C, and the thermal stability is high; moreover, the preparation method is simple and high-efficiency, has the advantages of industrial production, and has good application prospect in the fields of electronic connecting materials such as anisotropic conductive adhesives and the like.

Description

1. Technical field: [0001] The invention relates to a method for preparing monodisperse silver-plated microspheres, which are mainly used in the fields of anisotropic conductive adhesives and the like. 2. Background technology [0002] Electronic products are widely used in modern society, and various types of conductive connections are required in the production process. The most widely used conductive connection material is Pb / Sn solder, which has the characteristics of low cost and high strength; but with the development of society, Pb / Sn solder can no longer meet the increasing performance and green requirements of electronic products, which is mainly manifested in the following aspects: [0003] First, the trend toward miniaturization and portability of electronic products is becoming stronger and stronger, which requires higher and higher integration of semiconductor chips. As a result, the number of input and output ports (I / O) per unit area of ​​electronic components...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/20C23C18/44B01J13/02C09J9/02C09J11/04C08G12/32
Inventor 黄玉安秦安川查海华周健欢戴志龙龚海卫谢丹王立中王涵张晓娴
Owner NANJING INST OF TECH
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