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Bi-component conductive silica gel as well as preparation method and application thereof

A conductive silicone, two-component technology, applied in the field of conductive adhesive, can solve the problem of large heat dissipation, and achieve the effect of improving shielding efficiency, excellent shielding efficiency and good storage stability

Active Publication Date: 2021-06-04
深圳市星河达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the heat dissipation of 5G equipment is large, which leads to the long-term use of the equipment in an environment greater than 70°C, and the outdoor environment also has high requirements for equipment sealing. Therefore, the isolation of liquid conductive silicone rubber and the isolation after aging are required. stricter

Method used

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  • Bi-component conductive silica gel as well as preparation method and application thereof
  • Bi-component conductive silica gel as well as preparation method and application thereof
  • Bi-component conductive silica gel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0042] A kind of nickel-coated graphite / carbon fiber in the application is prepared through the following steps:

[0043] a. Weigh graphite and carbon fiber according to the weight ratio of 1:3, and use ultrasonic treatment to uniformly mix the two to obtain graphite / carbon fiber composite material;

[0044] b. Degreasing: degreasing the above-mentioned graphite / carbon fiber composite material with 15wt% NaOH aqueous solution at 54°C for 10 minutes by ultrasonic vibration, taking out the sample, and washing it with deionized water until neutral;

[0045] c. Coarsening: use 10wt% HNO 3 The aqueous solution was roughened by ultrasonic vibration at 55°C for 10 minutes, and the sample was taken out and rinsed with deionized water until neutral;

[0046] d. Sensitization: in 37wt% hydrochloric acid 60mL / L, SnCl 2 2H 2 In the sensitization solution of O 30g / L, sensitize with ultrasonic vibration for 6min, take out the sample, and rinse it with deionized water;

[0047] e. Activa...

preparation example 2

[0051] The nickel-coated graphite / carbon fiber of Preparation Example 2 is the same as that of Preparation Example 1, except that the same amount of graphite is replaced with flexible graphite.

preparation example 3

[0053] The fumed silica-titanium dioxide composite powder in this application is prepared by the following operations:

[0054] Pretreatment of fumed silica: Add sodium polyacrylate with a total weight of 12% of the slurry under the conditions of 23°C, rotational speed 1200r / min, ball-to-material ratio 5.5:1, and slurry concentration of 2.3%, and ultrafine grinding for 80 minutes , to obtain the fumed silica after dispersion treatment;

[0055] Titanium dioxide pretreatment: Under the conditions of 24°C, rotational speed 1200r / min, ball-to-material ratio 4:1, and slurry concentration 50%, ultra-fine grinding for 60 minutes to obtain dispersed titanium dioxide;

[0056] Mix the treated fumed silica and titanium dioxide in a weight ratio of 1:0.5, control the slurry concentration to 12%, ultra-fine grinding for 40 minutes, and sieve to obtain a silica / titanium dioxide composite material with an average particle size of 1000 mesh .

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Abstract

The invention relates to the technical field of conductive adhesives, in particular to bi-component conductive silica gel and a preparation method and application thereof. The bi-component conductive silica gel comprises an adhesive A and an adhesive B. The adhesive A is prepared from the following raw materials in parts by weight: 80 to 120 parts of alpha, omega-dihydroxy polydimethylsiloxane, 10 to 20 parts of diethylamino methyl triethoxy silane, 60 to 90 parts of nickel-coated graphite / carbon fiber, 1 to 3 parts of coupling agent, 5 to 15 parts of filler and 0.001 to 0.01 part of catalyst; The adhesive B is prepared from the following raw materials in parts by weight: 80 to 120 parts of alpha, omega-dihydroxy polydimethylsiloxane, 10 to 20 parts of diethylamino methyl triethoxy silane, 60 to 90 parts of nickel-coated graphite / carbon fiber, 1 to 3 parts of a coupling agent, 5 to 15 parts of filler and 3 to 5 parts of ethynyl cyclohexanol. The shielding effectiveness of the conductive silica gel can reach up to 138 dB and is more than 80 dB after aging, the shielding effectiveness is excellent, and the conductive silica gel can be widely applied to the repeater to shield electromagnetic interference of wireless communication equipment.

Description

technical field [0001] This application relates to the technical field of conductive adhesive, more specifically, it relates to a two-component conductive silica gel and its preparation method and application. Background technique [0002] With the rapid development of modern communication technology, electromagnetic interference and electromagnetic compatibility problems caused by electromagnetic waves are becoming more and more serious. It will not only cause interference and damage to electronic instruments and equipment, affect their normal work, but also pollute the environment and endanger human health. In addition, electromagnetic wave leakage will also endanger national information security and the security of military core secrets. Therefore, exploring efficient electromagnetic shielding materials to prevent electromagnetic interference and electromagnetic compatibility problems caused by electromagnetic waves is of great significance for improving the safety perfor...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J9/02C09J11/04C09J11/06H05K9/00
CPCC08K2003/0862C08L2201/08C09J9/02C09J11/04C09J11/06C09J183/04H05K9/0081C08K9/00C08K3/04C08K7/06C08K9/02C08K9/10C08K3/08C08K9/08C08K7/26C08K13/06C08K5/544
Inventor 徐远东
Owner 深圳市星河达科技有限公司
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