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Electromagnetic shielding silver paste for communication equipment and preparation method thereof

A technology for electromagnetic shielding and communication equipment, applied in the field of electromagnetic shielding silver paste for communication equipment and its preparation, can solve the problems of poor shielding effect, high curing temperature, poor conductivity, etc., and achieve good shielding effect, stable adhesion, excellent The effect of printing performance

Pending Publication Date: 2020-08-25
湖南省国银新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are problems with the currently used shielding silver paste: the curing temperature is high, reaching about 150°C, which will easily deform the substrate and cause damage to the substrate, and the resistance is large, the conductivity is poor, and the shielding effect is not good.

Method used

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  • Electromagnetic shielding silver paste for communication equipment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of electromagnetic shielding silver paste for communication equipment:

[0029] (1) Take by mass percentage: 1% phenolic resin, 7% phenoxy resin, 22% diethylene glycol ethyl ether acetic acid, 60% diethylene glycol butyl ether acetate, 10% KH560, in Heating and stirring at 50-100°C to obtain an organic carrier;

[0030] (2) Add 100g of titanium hydride to 180g of Schiff's base, mix well and add to 1200g of N-methylpyrrolidone solvent together, heat and react at 70-90°C for 0.5-2h, after filtering, wash the filter residue with ethanol for 2- 3 times, filter ethanol, and dry at room temperature to obtain the metal chelate; wherein, the D50 of the titanium hydride is 0.5 μm; the molecular weight of the Schiff base is 6000;

[0031] (3) Take silver powder A45g, silver powder B15g, organic vehicle 48g prepared by step (1) and metal chelate additive 2g prepared by step (2), mix and roll to obtain the electromagnetic shielding silver paste. Wherein, the ...

Embodiment 2

[0033](1) Weighing by mass percentage: 2% ABS resin, 4% phenoxy resin, 40% DBE, 40% diethylene glycol butyl ether acetate, 6% KH570, 8% 90-degree open Ring curing agent, heating and stirring at 50-100°C to obtain an organic vehicle;

[0034] (2) Add 100g of titanium hydride to 200g of Schiff's base, mix well and add to 1000g of N-methylpyrrolidone solvent together, heat and react at 70-90°C for 0.5-2h, after filtering, wash the filter residue with ethanol for 2- 3 times, filter ethanol, and dry at room temperature to obtain the metal chelate; wherein, the D50 of the titanium hydride is 1.0 μm; the molecular weight of the Schiff base is 8000;

[0035] (3) Weigh 50 g of silver powder A, 10 g of silver powder B, 39 g of organic carrier prepared in step (1) and 1 g of metal chelate auxiliary agent prepared in step (2), mix and roll to obtain the electromagnetic shielding silver paste. Wherein, the silver powder A is flake silver powder, the particle size distribution is 3.0-4.0 μ...

Embodiment 3

[0037] (1) Take by mass percentage: 2% phenolic resin, 2% polyester resin, 50% diethylene glycol ethyl ether acetic acid, 16% diethylene glycol butyl ether acetate, 5% KH550, 10 % of 90-degree ring-opening curing agent and 5% of lecithin are heated and stirred at 50-100°C to obtain an organic vehicle;

[0038] (2) Add 100g of titanium hydride to 250g of Schiff's base, mix well and add to 1000g of N-methylpyrrolidone solvent together, heat and react at 70-90°C for 0.5-2h, after filtering, wash the filter residue with ethanol for 2- 3 times, filter ethanol, and dry at room temperature to obtain the metal chelate; wherein, the D50 of the titanium hydride is 1.2 μm; the molecular weight of the Schiff base is 10000;

[0039] (3) Take by weighing silver powder A 60g, silver powder B 5g, the organic carrier 34.9g that step (1) prepares and the metal chelate auxiliary agent 0.1g that step (2) prepares, mix, roll, obtain described electromagnetic shielding silver pulp. Wherein, the s...

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Abstract

The invention provides electromagnetic shielding silver paste for communication equipment and a preparation method thereof. The electromagnetic shielding silver paste is prepared from, by mass percent, 45%-60% of silver powder A, 5%-15% of silver powder B, 0.1%-2% of metal chelate and 20%-48% of organic carriers; and both the silver powder A and the silver powder B are silver powder which is low in bulk density, very concentrated in particle size and moderate in burning loss. The flake powder with low bulk density is very good in electrical property, the silver powder with very concentrated granularity has the advantages in dispersity, leveling property and uniformity; and the prepared silver paste is stable in performance in the long-time printing process. The metal chelate is a Schiff base titanium hydride metal chelate, so that the quick-drying performance of the low-temperature silver paste can be improved. The electromagnetic shielding silver paste prepared through mutual cooperation of the components not only has excellent printing performance and can meet low-temperature curing, but also has excellent quick-drying performance, and is stable in adhesive force and good in shielding effect in subsequent environmental testing.

Description

technical field [0001] The invention relates to the technical field of conductive silver paste, in particular to an electromagnetic shielding silver paste for communication equipment and a preparation method thereof. Background technique [0002] With the development of communication technology, especially 5G communication technology, various related supporting materials are also on the rise, especially the development of mobile phone technology. Now the new 5G technology mobile phone will gradually occupy the main mobile phone market in the future. The silver paste materials used in various 5G mobile phones will also receive more and more attention. With the development of communication equipment such as 5G mobile phones and the demand for high-frequency and high-speed communication, the problem of electromagnetic interference of high-frequency components is becoming more and more serious. Electromagnetic shielding in the high-frequency band, in communication equipment, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C09D11/52C09D11/103C09D11/102C09D11/106C09D11/104C09D11/03
CPCH05K9/0081C09D11/52C09D11/103C09D11/102C09D11/106C09D11/104C09D11/03
Inventor 刘宵杨华荣严红革王翔肖新明闫仁泉陈吉华
Owner 湖南省国银新材料有限公司
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