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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 sedimentation of the metal powder due to poor dispersion caused by the metal powder being coated with a metal oxide. Metal powder composition has excellent redispersibility and stability over time

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

Embodiment

[0114] Hereinafter, the present invention will be more specifically described 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 Examples and Comparative Examples were evaluated as follows.

[0116]

[0117] About 50 g of the metal powder-containing composition was put into an airtight container, and the state of the composition after leaving it to stand for 2 days or more in a thermostat set at 50° C. was confirmed with a medicine spoon. Stability over time was evaluated by the following criteria.

[0118] (benchmark)

[0119] A: Not cured.

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

[0121] C: Overall curing.

[0122]

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

Synthetic example 1

[0130]In a reaction vessel equipped with a stirring device, a thermometer, and a condenser, C-1015N (polycarbonate diol manufactured by Kuraray Co., Ltd., raw material diol molar ratio: 1,9-nonanediol: 2-methyl-1,8-octanediol=15:85, molecular weight: 964) 718.2 g, 2,2-dimethylol butyric acid (manufactured by Nippon Chemical Co., Ltd.), which is a dihydroxy compound having a carboxyl group, 136.6 g. 1293 g of diethylene glycol ethyl ether acetate (manufactured by Daicel 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) (manufactured by Sumika Bayer Uretan Co., Ltd., trade name "デスモジュール-W") 237.5g.

[0132] After completion of the dropwise addition, 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 confirming that the isocyanate had almost disappeare...

Synthetic example 2

[0135] In 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, PLACCEL CD-220 (1,6-hexanediol-based polycarbonate produced by Daicel Chemical Co., Ltd. 1000.0 g (0.50 mol) of ester diol), 250.27 g (1.00 mol) of 4,4'-diphenylmethane diisocyanate, and 833.51 g of γ-butyrolactone were heated up to 140°C. It reacted at 140 degreeC for 5 hours, and obtained the 2nd diisocyanate. 288.20 g (1.50 mol) of trimellitic anhydride, 125.14 g (0.50 mol) of 4,4′-diphenylmethane diisocyanate and 1361.14 g of γ-butyrolactone, which are polycarboxylic acids having acid anhydride groups, were charged in the reaction liquid, After raising the temperature to 160° C., it was reacted for 6 hours to obtain an acid anhydride group-containing thermosetting polyurethane resin having a number average molecular weight of 18,000 (hereinafter referred to as “thermosetting polyurethane resin 2”). The obtained thermos...

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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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