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Copper electrode slurry for multilayer ceramic capacitor

A technology of multilayer ceramics and capacitors, applied in the direction of fixed capacitor electrodes, multilayer capacitors, fixed capacitor dielectrics, etc., can solve the problems affecting the use of screen printing, large viscosity changes, loss of fluidity, etc., to suppress cracking and delamination , Inhibition of shrinkage, good thixotropy effect

Active Publication Date: 2020-08-25
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of the existing copper internal electrode slurry system is extremely unstable. After a period of time, the viscosity changes greatly. It even forms a gel and loses fluidity after a long period of storage, which seriously affects the use of subsequent screen printing.

Method used

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  • Copper electrode slurry for multilayer ceramic capacitor
  • Copper electrode slurry for multilayer ceramic capacitor
  • Copper electrode slurry for multilayer ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The slurry formula is according to the common method of slurry, such as weighing each formula in proportion for batching→stirring→dispersing→rolling→semi-finished product inspection→slurry mixing→finished product inspection→packaging to prepare the copper inner electrode slurry for MLCC.

[0032] Synthesis of polyamide polyacid polymer salt: surfactant is preferably CTAB, 8.2g AMPS (2-acrylamido-2-methylpropanesulfonic acid) is dissolved in deionized water, and the pH is adjusted to be 7-8 with NaOH ; Then 21g AM (monomer acrylamide), 1.3g BA (monomer butyl acrylate) and 2.5g DMDAAC (dimethyl diallyl ammonium chloride) were dissolved in aqueous solution containing 1gCTAB, stirred to make it fully mixed dissolved; through high-purity nitrogen 30min, remove the oxygen in the solution; then add initiator 0.08g K 2 S 2 o 8 solution and 0.03g NaHSO 3 After the solution was fully mixed, the stirring was stopped. During the experiment, the amount of deionized water used was...

Embodiment 2

[0042] The difference between embodiment 2 and embodiment is: a kind of multilayer ceramic capacitor copper electrode slurry, is made up of the raw material of following weight part:

[0043] 45 parts of copper powder, the particle size D50 of flake copper powder is 0.3μm;

[0044] 7.5 parts of ceramic powder, ceramic powder adopts BaNd 2X (Sm (0～1 / 3) PR (0～1 / 3) ) 2(l-x) Ti 5 o 14 , 1 part of dispersant;

[0045] 2.9 parts of cellulose resin, cellulose resin adopts ethyl cellulose and polyvinyl butyral resin 4:1 blending;

[0046] 45 parts of organic solvent, organic solvent adopts dihydroterpineol;

[0047] 0.1 part of plasticizer, the plasticizer adopts dibutyl phthalate;

[0048] The main dispersant is polyamide polyacid polymer salt, 0.8 part; the auxiliary dispersant is 0.2 part of DP270.

Embodiment 3

[0050] The difference between embodiment 3 and embodiment is: a kind of multilayer ceramic capacitor copper electrode slurry, is made up of the raw material of following weight part:

[0051] 45 parts of copper powder, the particle size D50 of spherical copper powder is 0.1 μm;

[0052] 15 parts of ceramic powder, ceramic powder adopts zirconia composite ceramic powder;

[0053] 1.5 parts of dispersant;

[0054] 3 parts of cellulose resin, cellulose adopts hydroxypropyl cellulose;

[0055] 35 parts of organic solvent, organic solvent adopts butyl carbitol acetate;

[0056] 0.5 parts of plasticizer, dioctyl phthalate;

[0057] The main dispersant is polyamide polyacid polymer salt, 1.3 parts; the secondary dispersant is SILOK 70740.2 parts.

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Abstract

The invention discloses copper electrode slurry for a multilayer ceramic capacitor. The copper electrode slurry is composed of the following raw materials in parts by weight: 40-50 parts of copper powder; 5-15 parts of ceramic powder; 0.5 to 1.5 parts of a dispersing agent; 1-3 parts of cellulose resin; 35 to 45 parts of an organic solvent; 0.1 to 1 part of a plasticizer, wherein the dispersing agent comprises a main dispersing agent and an auxiliary dispersing agent, the main dispersing agent is polybasic amide polybasic acid polymer salt, and the auxiliary dispersing agent is one or two of DP270, glyceryl tristearate and oxidized polyethylene; the content of the main dispersant accounts for more than 80% of the total amount of the dispersing agent. The invention provides the copper electrode slurry for the multilayer ceramic capacitor, and the slurry is high in viscosity stability after the nano copper powder is pulped.

Description

technical field [0001] The invention relates to the technical field of capacitor paste, in particular to a multilayer ceramic capacitor copper electrode paste. Background technique [0002] Ceramic capacitors use ceramics as the dielectric, and then form metal electrodes on both sides of the ceramic substrate (the materials used for the electrodes include silver, silver palladium, nickel, and copper). The methods of forming electrodes generally include thin-film technology and thick-film technology. At present, the screen printing method commonly used in thick film technology transfers the electrode paste to the surface of the ceramic substrate to form a certain pattern, and then fires it into a whole. [0003] Silver-based electronic pastes have been widely used in the electrodes of electronic components and shielding coatings to prevent electromagnetic interference. However, in recent years, the price of precious metals has doubled, and the miniaturization of multilayer ce...

Claims

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Application Information

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IPC IPC(8): H01G4/008H01G4/12H01G4/30
CPCH01G4/008H01G4/12H01G4/30
Inventor 杨爱民司留启白宝柱
Owner JIANGSU HOYI TECH
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