Method for producing metal powder-containing composition

A metal powder, manufacturing method technology, applied in metal processing equipment, overvoltage arresters using spark gaps, nanotechnology for materials and surface science, etc. Settling, composition curing and other problems, to achieve the effect of suppressing poor dispersion and excellent stability over time

Inactive Publication Date: 2014-04-23
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The subject of the present invention is to provide a method for producing a composition containing metal powder, which solves the problem of solidification of the composition or sedime

Method used

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  • Method for producing metal powder-containing composition
  • Method for producing metal powder-containing composition
  • Method for producing metal powder-containing composition

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0113] Example

[0114] Hereinafter, the present invention will be explained more specifically based on examples, but the present invention is not limited to these examples at all.

[0115] The properties of the metal powder-containing compositions obtained in the examples and comparative examples were evaluated as follows.

[0116]

[0117] About 50 g of the metal powder-containing composition was put into a sealed container, and the state of the composition after being allowed to stand in a thermostat set at 50°C for 2 days or more was confirmed with a medicine spoon. The stability over time was evaluated using the following criteria.

[0118] (Benchmark)

[0119] A: No curing.

[0120] B: A small amount of curing is observed at the bottom.

[0121] C: Overall curing.

[0122]

[0123] About 50 g of the metal powder-containing composition was put into a sealed container, and the state of the composition after being allowed to stand in a thermostat set at 50°C for 12 hours or more was co...

Example Embodiment

[0129]

[0130] In a reaction vessel equipped with a stirring device, a thermometer, and a condenser, C-1015N (polycarbonate diol manufactured by Kurara Co., Ltd., a raw material diol molar ratio: 1,9-nonanediol: 2-Methyl-1,8-octanediol=15:85, molecular weight: 964) 718.2 g, 2,2-dimethylolbutanoic acid (manufactured by Nippon Kasei Co., Ltd.) as a dihydroxy compound having a carboxyl group, 136.6 g. 1,293 g of diethylene glycol ethyl ether acetate (manufactured by Diisel Chemical Co., Ltd.) as a solvent, and all the raw materials were dissolved at 90°C.

[0131] The temperature of the liquid in which the raw material was dissolved was lowered to 70°C, and methylene bis(4-cyclohexyl isocyanate) as a polyisocyanate (manufactured by Sumika Bioretan Co., Ltd., trade name) was added dropwise through a dropping funnel over 30 minutes "デスモジュール-W") 237.5g.

[0132] After the dripping, the reaction was carried out at 80°C for 1 hour, at 90°C for 1 hour, and at 100°C for 1.5 hours. After co...

Example Embodiment

[0134]

[0135] A 5-liter four-necked flask equipped with a stirrer, a cooling tube with an oil-water separator, a nitrogen introduction tube, and a thermometer is charged with PLACCEL CD-220 (1,6-hexanediol-based polycarbonate manufactured by Dyser Chemical Co., Ltd.) Trade name of ester diol) 1000.0 g (0.50 mol), 250.27 g (1.00 mol) of 4,4'-diphenylmethane diisocyanate, and 833.51 g of γ-butyrolactone, and the temperature was raised to 140°C. The reaction was carried out at 140°C for 5 hours to obtain the second diisocyanate. 288.20 g (1.50 mol) of trimellitic anhydride as a polycarboxylic acid having an acid anhydride group, 125.14 g (0.50 mol) of 4,4'-diphenylmethane diisocyanate, and 1,361.14 g of γ-butyrolactone were charged into this reaction liquid, After raising the temperature to 160° C., the reaction was carried out for 6 hours to obtain an acid anhydride group-containing thermosetting polyurethane resin having a number average molecular weight of 18,000 (hereinafter...

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Abstract

The purpose of the present invention is to provide a method for producing a metal powder-containing composition that has excellent re-dispersibility and excellent long-term stability by solving the problems of solidification of the composition and sedimentation of the metal powder, said problems being caused by poor dispersion due to the fact that the metal powder is coated with a metal oxide in the composition that contains the metal powder. A method for producing a metal powder-containing composition of the present invention is a method for producing a metal powder-containing composition that contains a metal powder and a binder component. This method for producing a metal powder-containing composition comprises: a step wherein a metal oxide is produced by hydrolyzing a metal alkoxide and a metal powder is coated with the metal oxide; and a step wherein the metal powder coated in the above-mentioned step is heated to 70 DEG C or higher in an organic solvent.

Description

technical field [0001] The present invention relates to a method for producing a composition containing a metal powder, and more specifically, to a method for producing a composition containing a metal powder coated with a metal oxide and having excellent redispersibility and stability over time. Background technique [0002] Compositions containing metal powders can be used in a variety of applications. For example, the discharge gap filling composition used for manufacture of an electrostatic discharge protector etc. are mentioned (for example, refer patent document 1). [0003] Electrostatic discharge (electro-static discharge, hereinafter also referred to as "ESD") refers to the intense discharge phenomenon that occurs when a charged conductive object (such as a human body) contacts or is sufficiently close to other conductive objects (such as an electronic instrument) , sometimes causing problems such as misoperation or damage of electronic equipment, or the direct cau...

Claims

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Application Information

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IPC IPC(8): B22F1/02H01T4/10H01T4/12B22F1/0545B22F1/16
CPCB22F2001/0092C08G18/4269C08L63/00C08G59/4269B22F1/0022C08G18/44C08G18/6659C08G18/0823C08G18/343B22F1/02C08K3/0075H01T1/24H01T4/02C08G18/12B82Y30/00C08K3/10B22F1/0545B22F1/147B22F1/16C08G18/282
Inventor 大西美奈
Owner SHOWA DENKO KK
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