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Silver-coated silicone rubber particles, conductive paste containing same, and conductive film production method using conductive paste

A technology of silicone rubber particles and manufacturing methods, applied in the direction of cable/conductor manufacturing, conductive layers on insulating carriers, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of reduced conductivity, increased workload, and particle hypertrophy etc. to achieve good electrical conductivity and inhibit coagulation

Active Publication Date: 2019-08-23
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the conductive silicone rubber particles disclosed in the above-mentioned conventional patent document 1, the silicone rubber particles used as master batches are easily agglomerated independently.
Conductive silicone rubber particles coated with precious metals also aggregate at the parts exposed from the unstable silicone rubber surface during the coating process, and the parent particles are crosslinked by the precious metals, resulting in particle enlargement. bad situation
In addition, when conductive silicone rubber particles are used as conductive fillers in conductive pastes, there are problems that the workload increases in the kneading process due to the enlargement of the particles, and the peeling of the noble metal film occurs, resulting in the loss of conductivity. reduction, or it is difficult to apply conductive silicone rubber particles to conductive spacers that require high dispersion

Method used

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  • Silver-coated silicone rubber particles, conductive paste containing same, and conductive film production method using conductive paste

Examples

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Embodiment

[0050] Next, examples of the present invention will be described in detail together with comparative examples.

[0051]

[0052] First, 10 g of silicone rubber particles having an average particle diameter of 10 μm was prepared as a master batch, and the surface of the silicone rubber particles was modified using an atmospheric plasma device for powder. Next, after immersing the surface-modified silicone rubber particles in 250 g of ion-exchanged water to which a surfactant was added, 25 kHz ultrasonic waves were irradiated for 10 minutes to prepare a dispersion liquid. Then, after adding 550 g of ethanol and 5.0 g of ethyl orthosilicate to this dispersion liquid and stirring for 5 minutes, 5 g of 1% nitric acid was added dropwise to hydrolyze ethyl orthosilicate. As a result, the first coating layer made of silica was provided on the surface of the silicone rubber particles.

[0053] After washing the above-mentioned silicone rubber particles with the first coating layer w...

Embodiment 2

[0055] As the silicone rubber particles with the first coating layer, silicone rubber particles with an average particle diameter of 3 μm of the master batch coated with silicic acid glass are used, and the complexing agent and reducing agent used in the coating of the second layer are used. The mass ratio of the substances contained in the aqueous solution containing silver nitrate and the aqueous solution containing silver nitrate was kept constant, and the mass used was adjusted so that the content ratio of silver became 78 parts by mass relative to 100 parts by mass of silver-coated silicone rubber particles. Except that, silver-coated silicone rubber particles were produced in the same manner as in Example 1. This silver-coated silicone rubber particle is referred to as Example 2. Furthermore, the silicone rubber particles were coated with silicic acid glass by kneading using a combination mixer. Specifically, by using a combination mixer to mechanically knead silicic ac...

Embodiment 3

[0057] As the silicone rubber particles with the first coating layer, silicone rubber particles with an average particle diameter of 30 μm of the master batch coated with silicon were used, and the silicone rubber particles containing a complexing agent and a reducing agent used when coating the second layer were used. The mass ratio of the substances contained in the aqueous solution and the silver nitrate-containing aqueous solution was kept constant, and the mass used was adjusted so that the content ratio of silver became 40 parts by mass relative to 100 parts by mass of silver-coated silicone rubber particles. , Silver-coated silicone rubber particles were produced in the same manner as in Example 1. This silver-coated silicone rubber particle is referred to as Example 3. Furthermore, the silicone rubber particles were coated with silicon by kneading using a combination mixer. Specifically, the silicone rubber with the first coating layer was produced by mechanically kne...

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Abstract

The silver-coated silicone rubber particles according to the present invention are each formed by providing a first coating layer comprising silicon or a silicon compound on the surface of a siliconerubber particle and further providing a second coating layer comprising silver on the surface of the first coating layer. In a conductive paste containing the silver-coated silicone rubber particles,the silver-coated silicone rubber particles are dispersed evenly.

Description

technical field [0001] The present invention relates to a silver-coated silicone rubber particle suitable as a conductive filler or conductive particle contained in a conductive adhesive, a conductive film, and a conductive spacer, and a conductive paste containing the silver-coated silicone rubber particle And the method of manufacturing a conductive film using this conductive paste. In addition, this international application claims priority based on Japanese Patent Application No. 5542 (Japanese Patent Application No. 2017-5542) filed on January 17, 2017, and uses all the contents of Japanese Patent Application No. 2017-5542 in this international application . Background technique [0002] Conventionally, a conductive silicone rubber particle is disclosed, which is formed on the surface of the silicone rubber particle with an average particle diameter of 0.1 to 100 μm by a physical vapor deposition method. ∼80% by mass of noble metal coating (for example, refer to Paten...

Claims

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Application Information

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IPC IPC(8): C08J3/12H01B1/00H01B1/22H01B5/00H01B13/00
CPCC08J3/12H01B1/22C08J3/128C08J2383/04C08J3/124C08L83/00C08K3/34C08K3/08H01B5/16C08K3/36C08L83/04C08L2203/16C23C18/1641C23C18/1651H01B5/14
Inventor 赤池宽人山崎和彦
Owner MITSUBISHI MATERIALS CORP
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