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A preparation method of silver nano-mixed filler modified silicone rubber conductive composite material

A conductive composite material and mixed filler technology, applied in nanotechnology and other directions, can solve the problems of poor compatibility, difficult composite performance, easy aggregation of nano-silver particles, etc., to achieve short reaction process, excellent electrical conductivity and mechanical properties, particle size uniform effect

Active Publication Date: 2019-03-29
HANGZHOU NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the silver nanoparticles prepared by the conventional method have high surface energy and are easy to agglomerate, and the compatibility between the silver nanoparticles and the silicone rubber matrix is ​​poor, making it difficult to disperse uniformly in the matrix and affecting the comprehensive performance of the composite material. , the present invention proposes a preparation method of a silver nano-mixed filler modified silicone rubber conductive composite material. The composite material not only has the advantages of stable resistance time characteristics, higher temperature limit and controllable temperature coefficient of resistance, but also has the advantages of High elasticity of rubber material

Method used

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  • A preparation method of silver nano-mixed filler modified silicone rubber conductive composite material

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Embodiment 1

[0028] Stir 1 mol of glucose, 0.85 g of polyvinylpyrrolidone and 1.2 mol of sodium hydroxide at 80°C for 10 minutes to fully and evenly disperse them in deionized water. Slowly drop in, after the drop is completed, the reaction is carried out for 10 minutes, and 1 mol of silane coupling agent 3-aminopropyltriethoxysilane is added. After the reaction is carried out for 6 hours, the silver nanoparticles are aggregated and precipitated, and the reaction solution is centrifuged, and the strong base is discarded. solution, and the muddy product was poured into deionized water for repeated washing, centrifuged, and dried in an oven at 80°C to obtain silane-modified silver nanoparticles, such as figure 1 (a) shown. Disperse 200 g of modified silver nanoparticles, 20 g of silver nanowires, and 100 g of vinyl silicone oil with a viscosity of 60,000 mPa.s in n-hexane at room temperature with high-speed stirring at 500 rpm to form a uniform dispersion, and dropwise add hydrogen-containin...

Embodiment 2

[0030] Stir 2 mol of glucose, 0.85 g of polyvinylpyrrolidone, and 1.2 mol of sodium hydroxide at 60°C for 10 minutes to fully and evenly disperse them in deionized water. Add 1mol of silane coupling agent 3-aminopropyltriethoxysilane for 10 minutes after the addition is completed. After 6 hours of reaction, the silver nanoparticles aggregate and precipitate. Centrifuge the reaction solution and discard the strong base. The reaction solution, and the muddy product was poured into deionized water to wash repeatedly, centrifuged, and dried in an oven at 80°C. Disperse 100 g of modified silver nanoparticles, 100 g of silver nanowires, and 100 g of vinyl silicone oil with a viscosity of 60,000 mPa.s in n-hexane at room temperature under high-speed stirring at 1,000 rpm to form a uniform dispersion, and add 3.5 g of hydrogen silicone oil dropwise and stir After 2 minutes, 0.5 g of platinum catalyst complex was added, stirred again for 2 minutes, and the reaction solution was poured ...

Embodiment 3

[0032] Stir 5 mol of glucose, 8.5 g of polyvinylpyrrolidone and 1.2 mol of sodium hydroxide at 60°C for 10 minutes to fully and evenly disperse them in deionized water. Slowly drop in, after the completion of the dropwise reaction, add 1mol of silane coupling agent 3-aminopropyltriethoxysilane for 10 minutes, after 8 hours of reaction, the silver nanoparticles aggregate and precipitate, centrifuge the reaction solution, and discard the strong alkali reaction solution , and the muddy product was poured into deionized water for repeated washing, centrifuged, and dried in an oven at 80°C. Disperse 100g of modified silver nanoparticles, 50g of silver nanowires, and 100g of vinyl silicone oil with a viscosity of 100,000 mPa.s in n-hexane at room temperature under high-speed stirring at 1500rpm to form a uniform dispersion, add 3.5g of hydrogen silicone oil dropwise and stir After 2 minutes, 0.1 g of the platinum catalyst complex was added and stirred again for 2 minutes, and the re...

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Abstract

The invention relates to the technical field of nanocomposite material. A preparing method of a silver nanoparticle mixed filler modified silicone rubber conductive composite material is provided, and aims to solve the problems that silver nanoparticles prepared through a regular method have high surface energy which is prone to agglomeration, compatibility between the silver nanoparticles and a silicone rubber basal body is poor, and thus the silver nanoparticles is so hard to be evenly dispersed in the basal body that comprehensive performance of the composite material is affected. The preparing method comprises the steps of preparing silver nanoparticles by adopting a chemical reduction method and conducting surface modification by using a silane coupling agent so as to make the silver nanoparticles evenly disperse in an organic solvent, and with a combination of a silver nanowire, dispersing the silver nanoparticles and mixed filler of the silver nanoparticles into a silicone rubber basal body by adopting a solution blended process so as to prepare an elastic silicone rubber composite material with excellent electrical conductivity. The composite material not only has the advantages of being stable in resistance time property, high in temperature limit, controllable in resistance temperature coefficient and the like, but also has high elasticity of a rubber material.

Description

technical field [0001] The invention relates to the technical field of nano-composite materials, in particular to a preparation method of a silver nano-mixed filler modified silicone rubber conductive composite material. Background technique [0002] Silicone rubber is known for its special (-Si-O-) n The main chain and organic functional groups form special properties, such as high temperature resistance, low temperature resistance, aging resistance and high filling property. At the same time, because it does not contain anti-aging agents, softeners, plasticizers, accelerators and other additives, it will not cause environmental pollution due to leakage of traditional electronic components. It is one of the most important base materials for the preparation of high-conductivity rubber. [0003] Silicone rubber itself does not have conductive properties, and the preparation of conductive silicone rubber composites by dispersing conductive fillers in insulating silicone rubbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08K9/06C08K3/08C08K7/06B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00C08K3/08C08K7/06C08K9/06C08K2003/0806C08K2201/001C08K2201/011C08L83/04
Inventor 汤龙程王刚刘亚军龚丽秀陈利民吴连斌蒋剑雄
Owner HANGZHOU NORMAL UNIVERSITY
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