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Method for preparing carbon nano tube silvered acrylic acid series electromagnetic shielding coating

An electromagnetic shielding paint, carbon nanotube technology, applied in the direction of radiation absorbing paint, coating, fibrous filler, etc., can solve the problems of difficult dispersion, limitation, high contact resistance, etc.

Active Publication Date: 2011-02-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to disperse and has a large contact resistance, which limits its practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 2.0g of CNTs into 150ml of 63% concentrated nitric acid, ultrasonically vibrate for about 4 hours, filter and wash with deionized water until neutral. Then respectively in the pre-prepared SnCl 2 Sensitizer and PdCl 2 The sensitization and activation are carried out in the activation solution for 10 minutes, and the sensitization and activation processes are dispersed by ultrasonic waves with a power of 800W. Then filter and wash until neutral. The activated CNTs and deionized water were made into 150ml suspension, and 2ml of a composite surfactant solution with a mass concentration of 3% was added, stirred, ultrasonically dispersed for 1min, and then 0.05g NaH was added 2 PO 2 , stirred for 20min; then slowly added NiSO 4 Complexing solution and NaH 2 PO 2 The reducing solution starts the electroless nickel plating reaction, and the composition of the electroless nickel plating reaction solution is: NiSO 4 30g / L, sodium citrate 10g / L, triethanolamine 90ml / L,...

Embodiment 2

[0023] Add 2.0g of CNTs into 150ml of 63% concentrated nitric acid, ultrasonically vibrate for about 4 hours, filter and wash with deionized water until neutral. Then respectively in the pre-prepared SnCl 2 Sensitizer and PdCl 2 The sensitization and activation are carried out in the activation solution for 5 minutes, and the sensitization and activation processes are dispersed by ultrasonic waves with a power of 800W. Then filter and wash until neutral. The activated CNTs and deionized water were made into 200ml suspension, and 10ml of a composite surfactant solution with a mass concentration of 3% was added, stirred, ultrasonically dispersed for 1min, and then 0.05g NaH was added 2 PO 2 , stirred for 10min; then added 200ml of a mixture containing 15ml of ethanol, 2ml of composite surfactant and 50g of potassium sodium tartrate, and dispersed by ultrasonic at 800W for 2min; finally, slowly added dropwise 100ml of AgNO 3 Silver ammonia solution with a concentration of 100...

Embodiment 3

[0025] Add 2.0g of CNTs into 150ml of 63% concentrated nitric acid, ultrasonically vibrate for about 4 hours, filter and wash with deionized water until neutral. Then respectively in the pre-prepared SnCl 2 Sensitizer and PdCl 2 The sensitization and activation were carried out in the activation solution for 20 minutes, and the sensitization and activation processes were dispersed by ultrasonic waves with a power of 800W. Then filter and wash until neutral. The activated CNTs and deionized water were mixed into 150ml suspension, and 20ml of a composite surfactant solution with a mass concentration of 3% was added, stirred, ultrasonically dispersed for 1min, and then 0.05g NaH was added 2 PO 2 , stirred for 15min; then slowly added NiSO 4 Complexing solution and NaH 2 PO 2 The reducing solution starts the electroless nickel plating reaction, and the composition of the electroless nickel plating reaction solution is: NiSO 4 30g / L, sodium citrate 10g / L, triethanolamine 70m...

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Abstract

The invention discloses a method for preparing a carbon nano tube silvered acrylic acid series electromagnetic shielding coating. The method comprises the following steps of: plating a layer of nickel on the surface of CNTs (carbon nano tubes) by adopting a chemical plating method, and then performing chemical silvering to obtain a silvered CNTs composite filler which takes the CNTs with high length-diameter ratio as cores and takes a uniform silvering layer as a shell; and mixing the prepared silvered CNTs, acrylic resin, ethyl acetate and n-butyl alcohol in a ratio, and dispersing the mixture uniformly to finally prepare the electromagnetic shielding coating with good electric conductivity and electromagnetic shielding effect. The layer of nickel is uniformly plated on the surface of the CNTs before the chemical silvering so that the bonding force between the silvering layer and the CNTs is improved and the silvered CNTs have better electric conductivity and dispersibility and are favorable for application in the electromagnetic shielding material field.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube silver-plated acrylic electromagnetic shielding coating. The prepared silver-plated carbon nanotube can be applied to the field of electromagnetic shielding composite materials. Background technique [0002] The development of modern electronic circuits and components tends to be miniaturized, integrated, lightweight and digital, and these electronic products mostly use light-weight, beautiful-looking plastics as casings, but these plastics have no protection against electromagnetic waves, so they often make electronics Products are disturbed by external electromagnetic waves (ie, EMI), resulting in misoperation, image disturbance, and sound disturbance, etc., thus forming the problem of electromagnetic pollution. In order to solve the problem of electromagnetic interference (EMI), electromagnetic shielding materials have been developed rapidly. Among various electromagnetic shielding m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C09D5/32C23C18/31C09C1/44
Inventor 张海燕黄耀林
Owner GUANGDONG UNIV OF TECH
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