Preparation method of activated carbon filler with high electromagnetic wave absorption performance
A technology of absorption performance and electromagnetic wave, applied in the field of preparation of activated carbon fillers with high electromagnetic wave absorption performance, can solve the problems of no solution, viscosity increase, process performance deterioration, etc., to achieve the effect of increasing strength, strengthening wave absorption efficiency, and improving process performance
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Embodiment 1
[0019] Add 5g of oleic acid to 100g of microwave-absorbing special activated carbon powder, and perform mechanical stirring at 40°C for 120min to form a pretreatment material. Add 60g of 12% polyvinyl alcohol aqueous solution to the pretreatment material, carry out mechanical kneading at 70°C for 120min, and then extrude through a screw extruder and a molding die to make a 4mm long preform. Then send the preform into the dryer and dry it in the air at 80°C for 2 hours to obtain a density of 0.68g / cm 3 , Activated carbon granular wave-absorbing filler with a strength of 4MPa. According to the composite molding test and microwave absorption performance test of compounding with epoxy resin, it is found that the maximum filler content can reach 45%, which can still meet the viscosity requirements of matrix molding. For samples with the same thickness, the frequency range of the reflectance test less than -10dB reaches 4.2GHz, and the limit absorption value is -21.2dB, which is si...
Embodiment 2
[0021] Add 22g of octylphenol polyoxyethylene ether to 100g of microwave-absorbing special activated carbon powder, and perform mechanical stirring at a temperature of 70°C for 30min to form a pretreatment material. Add 450g of an 8% aqueous solution of hydroxymethyl cellulose to the pretreatment material, perform mechanical kneading at 40°C for 60 minutes, and then extrude through a screw extruder and a molding die to make a 2mm long preform material. Then the preform is sent into the dryer and dried in the air at 120°C for 4 hours to obtain a density of 0.58g / cm 3 , Activated carbon granular wave-absorbing filler with a strength of 2.7MPa. After composite molding test and microwave absorption performance test of compounding with epoxy resin, it is found that when the filler content can reach 40%, it can still meet the viscosity requirements of matrix molding. For samples with the same thickness, the frequency range of the reflectance test less than -10dB reaches 4.8GHz, an...
Embodiment 3
[0023] Add 10g of linoleic acid to 100g of special activated carbon powder for absorbing waves, and perform mechanical stirring at 40°C for 60min to form a pretreatment material. Add 60g of a 15% aqueous solution of sulfonated lignin to the pretreatment material, carry out mechanical kneading at 70°C for 120min, and then extrude through a screw extruder and a molding die to make a 2.5mm long preform material. Then the preform is sent to the dryer and dried in the air at 80°C for 6 hours to obtain a density of 0.75g / cm 3 , Activated carbon granular wave-absorbing filler with a strength of 8MPa. After composite molding test and microwave absorption performance test of compounding with epoxy resin, it is found that when the filler content can reach 48%, it can still meet the viscosity requirements of matrix molding. For samples with the same thickness, the frequency range of the reflectance test less than -10dB reaches 4.7GHz, and the limit absorption value is -17.2dB, which is...
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