WO2021000451A1 - 一种"核-壳"结构功能性导电粒子的制备方法 - Google Patents
一种"核-壳"结构功能性导电粒子的制备方法 Download PDFInfo
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- WO2021000451A1 WO2021000451A1 PCT/CN2019/111353 CN2019111353W WO2021000451A1 WO 2021000451 A1 WO2021000451 A1 WO 2021000451A1 CN 2019111353 W CN2019111353 W CN 2019111353W WO 2021000451 A1 WO2021000451 A1 WO 2021000451A1
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- shell
- core
- conductive particles
- functional conductive
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
Definitions
- the invention relates to the field of conductive materials, in particular to a method for preparing functional conductive particles with a "core-shell" structure.
- Conductive composite materials are widely used in printed circuits, flexible electrodes, chip testing and packaging and other fields, and they are usually composed of a polymer matrix and conductive fillers.
- Traditional flexible conductive fillers use rigid conductors such as graphene, carbon nanotubes, conductive carbon black, nano-silver, etc.
- the manufacturing process is relatively mature, the electrical conductivity of the circuit is good, but with the circuit’s ability to deform materials such as bending , Folding requirements are getting higher and higher, traditional rigid conductors can no longer meet the demand, and the research of low modulus liquid metal flexible circuits also has certain limitations.
- Low-modulus liquid metal micro-nano particles have advantages in printed circuit processing, such as direct printing and compounding, compared with their bulk state. However, the prepared material exhibits insulation due to the existence of the oxide film and requires further mechanical sintering.
- the purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing functional conductive particles with a "core-shell" structure.
- the invention utilizes the rigidity and conductivity of silver and the fluidity of liquid metal to prepare conductive particles with high conductivity and self-repairing circuits through a simple and effective process.
- the conductive particles are endowed with initial conductivity and acid and alkali resistance through the silver shell, and through the overflow of the liquid metal core, the circuit maintains the connection of the conductive network under external force damage. It has important application prospects in the field of composite materials.
- a method for preparing functional conductive particles with a "core-shell" structure including the steps:
- the gallium-based liquid metal is subjected to constant-temperature ultrasonic dispersion under the action of a surfactant solution to obtain a micro-nano particle precursor liquid;
- the gallium-based liquid metal is gallium indium or gallium indium tin alloy.
- the surfactant solution is an aqueous solution of polyvinylpyrrolidone, sodium dodecylbenzene sulfonate or n-dodecyl mercaptan.
- the mass ratio of the gallium-based liquid metal to the surfactant is 2:1 to 1:5.
- the constant-temperature temperature is 15° C.
- the ultrasonic power is 100 W to 500 W
- the ultrasonic time is 20 to 120 minutes.
- the silver source is one of silver ammonia solution, silver acetate solution or silver fluoride solution.
- the mass ratio of the silver source to the gallium-based liquid metal is 1:5 to 5:1.
- the reducing agent is one of glucose, ascorbic acid or acetaldehyde.
- the ratio of the amount of the reducing agent to the mass of the silver source is 2:1.
- the heating temperature is 25 to 90° C.
- the stirring speed is 200 to 2000 rpm
- the heating and stirring time is 15 to 60 minutes.
- the present invention also provides a functional conductive particle with a "core-shell" structure, which is prepared by the above-mentioned method.
- the present invention has the following beneficial effects:
- the "core-shell" structure functional conductive particles prepared by the present invention are safe and non-toxic.
- the resistance can be adjusted according to the added silver content, and the adjustment range is 0.5 ⁇ -1k ⁇ /sq, and will overflow to maintain the conductive network under external force.
- the connection enables the prepared circuit to have a certain self-repair function, and has broad application prospects in the fields of printed circuits, flexible electrodes, and chip testing and packaging.
- the process of the present invention is simple and efficient, and the material source is easy to obtain. Compared with pure liquid metal particles, it is acid and alkali resistant and can be stored stably.
- Example 1 is a schematic diagram of the influence of the amount of silver source added on the surface resistance of particles in the preparation method of Example 1.
- Figure 1 shows a schematic diagram of the influence of the amount of silver source added on the surface resistance of particles in this embodiment.
- the square resistance of the "core-shell" structure functional conductive particles is 200 ⁇ /sq.
- the square resistance of the "core-shell" structure functional conductive particles is 0.5 ⁇ /sq.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims (10)
- 一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,包括步骤:(1)将镓基液态金属在表面活性剂溶液作用下进行恒温超声分散,得到微纳米粒子前驱液;(2)将银源与还原剂加入前驱液中进行加热搅拌,得到“核-壳”结构导电粒子。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述镓基液态金属为镓铟或镓铟锡合金。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述表面活性剂溶液为聚乙烯基吡咯烷酮、十二烷基苯磺酸钠或正十二烷基硫醇的水溶液。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述镓基液态金属和表面活性剂的质量比为2:1~1:5。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述恒温超声分散过程中,恒温温度为15℃,超声功率为100W~500W,超声时间为20~120分钟。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述银源为银氨溶液、醋酸银溶液或氟化银溶液的其中一种。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述银源与镓基液态金属的质量比为1:5~5:1。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述还原剂为葡萄糖、抗坏血酸或乙醛中的其中一种。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备方法,其特征在于,所述还原剂用量与银源质量比为2:1。
- 根据权利要求1所述的一种“核-壳”结构功能性导电粒子的制备 方法,其特征在于,所述加热搅拌过程中,加热温度为25~90℃,搅拌转速为200~2000rpm,加热搅拌时间为15~60分钟。
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CN115181453A (zh) * | 2022-06-24 | 2022-10-14 | 温州大学新材料与产业技术研究院 | 一种含镓的金属导电墨水及其制备方法和应用 |
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CN114752332B (zh) * | 2022-04-08 | 2023-07-14 | 宁波曦晗科技有限公司 | 一种基于液态金属宽温区各向异性导电胶及其制备方法 |
CN116313218A (zh) * | 2023-02-20 | 2023-06-23 | 北京梦之墨科技有限公司 | 一种超低温固化耐磨导电浆料及其制备方法与应用 |
CN116435005A (zh) * | 2023-03-15 | 2023-07-14 | 深圳先进电子材料国际创新研究院 | 一种导电金属粒子的制备方法及导电金属粒子 |
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