Co3O4-carbon nanotube modified polyurethane composite electromagnetic shielding material
A carbon nanotube modification and composite electromagnetic technology, which is applied in the direction of magnetic/electric field shielding and electrical components, can solve the problems of low reflection loss and dielectric loss, poor electromagnetic shielding efficiency, and complicated preparation procedures, etc., and achieve reduction Effects of thickness and weight, improvement of electromagnetic shielding effectiveness, and simplification of the manufacturing process
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[0025] To achieve the above object, the present invention provides the following technical solutions: a Co 3 o 4 - A composite electromagnetic shielding material of carbon nanotube modified polyurethane, including the following raw materials in parts by weight, characterized in that: 3-8 parts of magnetic cobalt tetroxide, 15-20 parts of single-walled carbon nanotubes, and 10-15 parts of triene Propyl isocyanurate, 50-70 parts of polyurethane resin, 1-3 parts of alkalizing agent, 0.5-2 parts of foaming agent, 0.5-2 parts of dispersing agent, magnetic cobalt tetroxide has a spinel structure, and cobalt oxide CoO The mass fraction is 30.1-31.5%, high cobalt oxide Co 2 o 3 The mass fraction is 66.2-67.4%. Single-walled carbon nanotubes are allotropes of carbon. The outer diameter of single-walled carbon nanotubes is 16-35 nm, the inner diameter is 1-3 nm, and the length is 3-6um. Urate is triallyl isocyanurate, the structure is hexagonal sheet crystal, and the structural formu...
Embodiment 1
[0033] (1) Preparation of alkalized single-walled carbon nanotubes: Weigh 1 part of alkalization agent into a three-neck bottle, and inject N into the three-neck bottle 2 , and then add 15 parts of single-walled carbon nanotubes, place the three-necked bottle in an ultrasonic processor, conduct ultrasonic treatment for 2-3 h, then place the three-necked bottle in a water bath, heat the water bath to 65-70 °C, and react 18-20 h, after the reaction is complete, the material is filtered through a Buchner funnel, and the filtered material is washed with 2500-3000 mL of distilled water to remove the residual alkalizing agent until the material is neutral, and the material is placed in an oven and heated to 80-85 ℃, dry for 2-3 h, and dry the water to obtain alkalized single-walled carbon nanotubes in black powdery solid, OH-SWNT-HOC(CH 3 ) 3 Nanoparticles1.
[0034] (2) Preparation of magnetic Co 3 o 4 Modified alkalized single-walled carbon nanotube material: Weigh 3 parts of ...
Embodiment 2
[0038] (1) Preparation of alkalized single-walled carbon nanotubes: Weigh 1.5 parts of alkalization agent into a three-neck bottle, and pass N 2 , and then add 16 parts of single-walled carbon nanotubes, place the three-necked bottle in an ultrasonic processor, conduct ultrasonic treatment for 2-3 h, then place the three-necked bottle in a water bath, heat the water bath to 65-70 °C, and react 18-20 h, after the reaction is complete, the material is filtered through a Buchner funnel, and the filtered material is washed with 2500-3000 mL of distilled water to remove the residual alkalizing agent until the material is neutral, and the material is placed in an oven and heated to 80-85 ℃, dry for 2-3 h, and dry the water to obtain alkalized single-walled carbon nanotubes in black powdery solid, OH-SWNT-HOC(CH 3 ) 3 Nanoparticles 2.
[0039] (2) Preparation of magnetic Co 3 o 4 Modified alkalized single-walled carbon nanotube material: Weigh 4 parts of magnetic cobalt tetroxide...
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