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Method for preparing electric filler and uses thereof

A technology for conductive fillers and uses, which is applied in the field of preparation of conductive fillers, can solve problems such as complicated preparation steps, and achieve good shielding performance

Inactive Publication Date: 2011-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are literature reports related to the synthesis of silver-coated glass microsphere core-shell particles at home and abroad, most of them adopt traditional chemical plating technology, such as "electroless silver plating on the surface of glass microspheres" electroplating and finishing "(2004, 23(1):7~9)”; “Research on Electroless Silver Plating of Hollow Glass Microspheres” Journal of Materials Science and Engineering (2004, 22(5):753~756)” proposed by Wang Yu et al., its preparation steps It is more complicated, such as roughening, sensitization and activation are often carried out before the implementation of electroless plating

Method used

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  • Method for preparing electric filler and uses thereof

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preparation example Construction

[0015] The invention provides a preparation method of a conductive filler. The conductive filler is a silver-coated glass microbead core-shell composite particle, and its core is cheap glass microbeads, which can be solid or hollow microbeads, with a particle size of 1-200 μm, and the surface is covered with a metal silver shell, so it has a light weight. features.

[0016] Conductive filler of the present invention-silver-coated glass microbead core-shell composite particle is made by the method for following steps:

[0017] (1) Cleaning glass beads: the purpose is to remove dust and oil from the surface of glass beads, so as to enhance the surface activity. Prepare 1500 ml of 1-5% sodium hydroxide solution, add about 150 g of the above powder, and stir for 15 minutes. Suction filtration, washing with water for 3 times until the pH value is 7, drying for later use.

[0018] (2) Carry out thiol modification to the surface of glass microspheres: take absolute ethanol, add si...

Embodiment 1

[0027] Prepare 1500 milliliters of 1% sodium hydroxide solution, add about 150 grams of glass microspheres, and stir for 15 minutes. Suction filtration, washing with water for 3 times until the pH value is 7, drying for later use. Take 2 liters of absolute ethanol, add 40 ml of γ-mercapto-propyltrimethoxysilane, stir until uniform, and reflux at 60 degrees Celsius for 6 hours. Wash the surface-modified glass microspheres 3 times, and filter each time until the filtrate does not produce foam, and dry it under vacuum at 60 degrees Celsius for use. Prepare reducing solution, get 300 grams of glucose, 20 grams of sodium potassium tartrate and 4000 milliliters of deionized water, mix uniformly to form a solution, then add 160 grams of polyvinylpyrrolidone (PVP), and then add 200 grams of surface-modified glass beads, Stir evenly to prepare a reduction mixture. In addition, prepare silver nitrate solution, add ammonia water at the same time, then add sodium hydroxide to adjust the...

Embodiment 2

[0029]Prepare 1500 milliliters of 5% sodium hydroxide solution, add about 150 grams of glass microspheres, and stir for 15 minutes. Suction filtration, washing with water for 3 times, as long as the pH value is 7, and drying for later use. Take 2 liters of absolute ethanol, add 200 ml of γ-mercapto-propyltrimethoxysilane, stir until uniform, and reflux at 60 degrees Celsius for 6 hours. Wash the surface-modified glass microspheres 3 times, and filter each time until the filtrate does not produce foam, and dry it under vacuum at 60 degrees Celsius for use. Prepare reducing solution, get 160 grams of glucose, 16 grams of sodium potassium tartrate and 4000 milliliters of deionized water, mix uniformly to form a solution, then add 80 grams of polyvinylpyrrolidone (PVP), and then add 180 grams of surface-modified glass beads, Stir evenly to prepare a reduction mixture. In addition, prepare silver nitrate solution, add ammonia water at the same time, then add sodium hydroxide to a...

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Abstract

The invention relates to a preparation method and the application of conductive fillers, which belong to the composite material field. The preparation method provided by the invention is: firstly, to clean glass beads; secondly, to modify the surface property of the glass beads, such as sulfhydrylation; thirdly, to clean the modified glass beads; fourthly, to add reducing agent into the glass beads including the modified glass beads to prepare a reducing mixture; fifthly, to prepare silver salt solution; sixthly, to mix the reducing mixture with the silver salt solution. And silver-wrapped glass bead core-shell composite particles are obtained through the reaction, the air pump filtering, the washing and the drying. The silver-wrapped glass bead core-shell composite particles prepared by the preparation method are provided with good conductivity and are provided with good shielding effectiveness when used as electromagnetic shielding materials. And the price is low. At the same time, compared with a traditional preparation method, the preparation method is simple with high efficiency. The method is widely applied in the information leakage prevention, the electromagnetic interference shielding, etc.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, in particular to a preparation method and application of a conductive filler. Background technique [0002] With the rapid development of science and technology, electronic and electrical products are widely used in daily life and industrial production. However, when these devices are in working condition, they radiate electromagnetic waves to the outside world all the time, forming a complex electromagnetic environment, which also produces a large number of negative effects, such as electromagnetic interference, electromagnetic information leakage and electromagnetic radiation pollution. In order for electronic equipment to work normally in this environment, it is necessary to solve the problem of electromagnetic compatibility between equipment. Technically speaking, shielding is one of the effective measures to solve electromagnetic compatibility problems. The so-called shielding is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/06H05K9/00
Inventor 官建国王一龙章桥新邵寒梅张清杰
Owner WUHAN UNIV OF TECH