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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AI-Extracted 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 e...

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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.

Application Domain

Non-macromolecular adhesive additivesMagnetic/electric field screening +1

Technology Topic

CyclohexanolElectromagnetic interference +12

Image

Examples

Experimental program(14)
Comparison scheme(2)
Effect test(1)

Example Embodiment

[0041] Preparation Example 1

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

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

[0044] b. Oil removal: the above-mentioned graphite/carbon fiber composite material was deoiled by ultrasonic oscillation with 15wt% NaOH aqueous solution at 54°C for 10min, and the sample was taken out and rinsed with deionized water until neutral;

[0045] c. Roughening: use 10wt% HNO 3 The aqueous solution was coarsened by ultrasonic vibration at 55 °C for 10 min, 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 sensitizing solution of 0 30g/L, ultrasonically vibrate for 6min, take out the sample, and rinse it with deionized water;

[0047] e. Activation: palladium PbCl 2 0.5g/L, 37wt% hydrochloric acid 10mL/L activation solution, ultrasonically sensitized for 6min, take out the sample, rinse with deionized water;

[0048] f. Reduction: in the reducing solution of sodium hypophosphite 25g/L, ultrasonically reduce for 5min, take out the sample, rinse with deionized water until neutral;

[0049] g. Electroless nickel plating: plating solution: NiSO 4 ·7H 2 O 28g/L, FeSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O 11.76g/L, C O SO 4 ·7H 2 O 12g/L, NaH 2 PO 2 ·H 2 O 20g/L, Na 3 C 6 HO 7 ·2H 2 O 44g/L, NH 4 Cl 3 ·3H 2 O 20g/L, 25wt% ammonia water was adjusted to pH 10, mechanically stirred at 80°C for 60min, cooled, filtered, washed with deionized water until neutral; dried in air at 60°C to constant weight, sieved to obtain particle size 30-50μm nickel clad graphite/carbon fiber.

Example Embodiment

[0050] 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 by flexible graphite.

Example Embodiment

[0052] 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 12% total slurry weight, ultrafine grinding for 80min at 23℃, rotating speed 1200r/min, ball-to-material ratio 5.5:1, slurry concentration 2.3% , to obtain the fumed silica after dispersion treatment;

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

[0056] The treated fumed silica and titanium dioxide are mixed in a weight ratio of 1:0.5, the concentration of the slurry is controlled to be 12%, ultrafine grinding for 40min, and sieving to obtain a silica/titanium dioxide composite material with an average particle size of 1000 meshes .

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PUM

Property	Measurement	Unit
Shielding effectiveness	138.0	db
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Good shielding effect
Improve shielding effectiveness

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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