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Lead-free environment friendly silver paste for piezoresistor and preparation method thereof

A varistor, silver paste technology, applied in varistor, conductive materials dispersed in non-conductive inorganic materials, resistance terminals/electrodes, etc., can solve problems affecting production efficiency and product quality, insufficient printing thickness, stickiness network and other problems to achieve the effect of ensuring the density of the silver surface, ensuring the printing characteristics and low resistance

Inactive Publication Date: 2012-11-07
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current products, due to the difference in thixotropy and off-grid performance of silver paste, defects such as screen sticking and insufficient printing thickness often occur during printing, which seriously affect production efficiency and product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An all-silver electronic paste for varistors, which is composed of 70% silver powder by weight, and is a mixture of spherical silver powders with different particle sizes. The particle sizes are: A: 0.3~0.6μm, B: 0.7~0.9μm , C: 1.8~2.5μm, the ratio is A:B:C=20:20:30; terpineol 10%; diethylene glycol butyl ether 11%; ethyl cellulose 3.9%; rosin modified phenolic resin 0.1 %; low melting point glass powder 4%; nickel powder 1%.

[0024] The preparation method of the above-mentioned electronic paste is as follows:

[0025] Step 1, weigh ethyl cellulose, rosin modified phenolic resin, terpineol and diethylene glycol butyl ether according to the above ratio, put them into containers respectively, then place them in a constant temperature tank, turn on the mixer, and keep the melting temperature at 80~ 90 degrees, dissolve for 3 hours, then filter the dissolved carrier through a 250-mesh screen for later use;

[0026] Step 2: Weigh the silver powder, carrier, solvent, glass...

Embodiment 2

[0029] An all-silver electronic paste for varistors, which is composed of 75% silver powder by weight, and is a mixture of spherical silver powders with different particle sizes. The particle sizes are: A: 0.3~0.6μm, B: 0.7~0.9μm , C: 1.8~2.5μm, the ratio is A:B:C=25:35:15; terpineol 4%; diethylene glycol butyl ether 16%; ethyl cellulose 1%; rosin modified phenolic resin 1 %; low melting point glass powder 2%; nickel powder 1%. According to the method of Example 1, an all-silver paste for environment-friendly piezoresistors was obtained.

Embodiment 3

[0031] An all-silver electronic paste for varistors, which is composed of 65% silver powder by weight, and is a mixture of spherical silver powders with different particle sizes. The particle sizes are: A: 0.3~0.6μm, B: 0.7~0.9μm , C: 1.8~2.5μm, the ratio is A:B:C=20:20:25; terpineol 10%; diethylene glycol butyl ether 17.5%; ethyl cellulose 1.9%; rosin modified phenolic resin 0.1 %; low melting point glass powder 4%; nickel powder 1.5%. According to the method of Example 1, an all-silver paste for environment-friendly piezoresistors was obtained.

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Abstract

The invention discloses a lead-free environment friendly silver paste for a piezoresistor. The lead-free environment friendly silver paste comprises the following compositions according to percentage by weight: 60-80wt% of silver powder, 14-34wt% of organic solvent, 1.5-4.0wt% of resin and 2.5-5.5wt% of inorganic additive. A method for preparing the lead-free environment friendly silver paste comprises the following steps of firstly, weighing the resin and the organic solvent according to the proportions and placing the resin and the organic solvent into a thermostatic reaction kettle for stirring, stirring again after the resin is dissolved completely, filtering impurities from the resin solution by using a 250 mesh screen so as to obtain a carrier; secondly, weighing the silver powder, the carrier and the inorganic additive according to proportions, and placing the weighed materials into a dual planetary stirrer for stirring; and thirdly, placing the stirred materials onto a three-roller grinder for rolling, when the fineness is less than 10 micrometers, sieving the materials by using the 250 mesh screen to obtain the environment friendly electronic full silver paste. The paste is environment friendly and harmless, and has an excellent printing performance.

Description

technical field [0001] The invention relates to the technical field of production of conductive electrodes of varistors, in particular to a lead-free environment-friendly silver paste for varistors and a preparation method thereof. Background technique [0002] In the production of electronic components, silver paste is a widely used precious metal material. In order to improve production efficiency, the silver paste used is generally screen printed, then dried, and then sintered. After the sintering is completed, solder pin wires on both ends of the electrode, and then use the encapsulating material to encapsulate and package. [0003] During the printing process, the printing performance of the silver paste has a great influence on the quality of the product. In the current products, due to the thixotropy of silver paste and the difference in off-grid performance, defects such as screen sticking and insufficient printing thickness often occur during printing, which seriou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01C1/14H01C7/10
Inventor 刘普生
Owner CAIHONG GRP ELECTRONICS CO LTD
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