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Electrode silver paste for environment-friendly zinc oxide varistor, and preparation method thereof

A varistor, zinc oxide technology, applied in the direction of varistor, resistance terminal/electrode, overvoltage protection resistor, etc., to achieve the effect of mature technology, stable state and excellent current flow characteristics

Pending Publication Date: 2019-11-26
宁夏中色新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems existing in the sintering of the existing silver paste. By adding flake silver powder to the formula and using high and low boiling point solvents, the prepared silver paste can make the electrode layer of the piezoresistor dense and have better adhesion

Method used

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  • Electrode silver paste for environment-friendly zinc oxide varistor, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An environmentally friendly electrode silver paste for zinc oxide varistors, which is composed of silver powder, organic binder, lead-free glass powder, solvent, and additives. The formula is composed of silver powder: 70%, organic binder 4.8% (organic The binder is ethyl cellulose, of which low molecular weight accounts for 1.8%, and high molecular weight accounts for 3%): lead-free glass powder 2% (the melting point of glass powder is 420°C): solvent 22% (including dimethyl adipate accounted for 17.6%, diethyl adipate accounted for 4.4%): additives 1.2% (of which oleic acid 0.5%, silicone leveling agent 0.5%, hydrogenated castor oil 0.2%): the silver powder in the above raw material ratio is composed of A, B and C are composed of three silver powders, namely: A is microcrystalline silver powder accounting for 47.5%, D50 is 0.08um, and the tap density is 2.6g / cm 3 ; B is spherical silver powder accounting for 47.5%, D50 is 0.6um, tap density is 5g / cm 3 ; C is flaky si...

Embodiment 2

[0026] An environmentally friendly electrode silver paste for zinc oxide varistors, which is composed of silver powder, organic binder, lead-free glass powder, solvent, and additives. The formula is composed of silver powder: 70%, organic binder 4.8% (organic The binder is ethyl cellulose, of which low molecular weight accounts for 1.8%, high molecular weight accounts for 3%), lead-free glass powder 2% (the melting point of glass powder is 430°C), solvent 22% (including dimethyl adipate Accounted for 17.6%, diethyl adipate accounted for 4.4%), additives 1.2% (of which oleic acid 0.5%, silicone leveling agent 0.5%, hydrogenated castor oil 0.2%). The silver powder in the above raw material ratio is composed of three silver powders A, B, and C, namely: A is microcrystalline silver powder accounting for 45% (D50 is 0.08um, tap density is 2.5g / cm 3 ), B is spherical silver powder accounting for 45% (D50 is 0.6um, tap density is 3.2g / cm 3 ), C is flake silver powder accounting for ...

Embodiment 3

[0028]An environment-friendly electrode silver paste for zinc oxide varistors, which is composed of silver powder, organic binder, lead-free glass powder, solvent, and additives. The formula consists of silver powder: 80%, organic binder 2.5% (organic The binder is ethyl cellulose, of which low molecular weight accounts for 1%, and high molecular weight accounts for 1.5%): lead-free glass powder 2% (the melting point of glass powder is 420°C): solvent 14% (including dimethyl adipate accounted for 11.2%, diethyl adipate accounted for 2.8%): additives 1.5% (of which oleic acid 0.5%, silicone leveling agent 0.5%, polyamide wax 0.5%); the silver powder in the above raw material ratio is composed of A, B and C are composed of three kinds of silver powder, namely: A is microcrystalline silver powder accounting for 45% (D50 is 0.08um, tap density is 2.6g / cm 3 ), B is spherical silver powder accounting for 45% (D50 is 0.6um, tap density is 3.2g / cm 3 ), C is flake silver powder accoun...

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Abstract

The invention discloses electrode silver paste for an environment-friendly zinc oxide varistor. The electrode silver paste is composed of silver powder, organic binding agent, inorganic binding agent,solvent and auxiliary. The preparation method comprises the following steps: 1) weighing organic binding agent and solvent into a container according to a formula proportion, placing the container ina thermostatic water bath, starting an agitator, and controlling temperature at 80-90 DEG C until the organic binding agent and the solvent are dissolved to be clear, supplementing the solvent lost in the heating process, filtering by using a 200-mesh silk screen, and placing the obtained organic carrier in a sealing container to save; 2) placing the organic carrier, solvent and auxiliary dissolved in the step 1) in the container, and uniformly dispersing by using a high-speed dispersion machine; 3) weighing the silver powder and inorganic binding agent according to the formula to add in thecontainer in the step 2), and uniformly dispersing in the high-speed dispersion machine; and 4) grinding by using a three-roll grinder; and 5) degassing in vacuum, and obtaining the silver paste whenthe detection is qualified. The electrode formed by the silver paste on the zinc oxide varistor is complete and compact, and is good in adhesive force with a base material.

Description

technical field [0001] The invention relates to the fields of electronics, chemical industry and materials, in particular to an electrode slurry for an environment-friendly zinc oxide varistor and a preparation method thereof. [0002] technical background [0003] Zinc oxide varistor is a solid-state voltage sensitive element with nonlinear volt-ampere characteristics and the function of suppressing transient overvoltage. It is widely used as an element for overvoltage protection of electrical systems at home and abroad. Protection to prevent damage to them due to static electricity, discharge, surge and other transient currents (such as lightning strikes, etc.). In order to improve the flow capacity of the zinc oxide varistor, it is necessary to ensure that the silver electrode printed on the surface of the zinc oxide varistor: the paste dries slowly during the printing process and does not produce printing defects; the solvent volatilization is stable during the surface dr...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00H01C7/12H01C1/14
CPCH01B1/16H01B1/22H01B13/00H01C7/12H01C1/14
Inventor 董宁利胡楠哈敏周建丽安军强刘芳王丹
Owner 宁夏中色新材料有限公司
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