Use of carbon-nanofibre comprising carbon networks
A technology of nano-carbon fiber and mesh, which is applied in the field of preparing sheets or films, static dissipative materials or conductive materials, and antistatic materials, and can solve the problems of limited preparation of ESD layers
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[0066] The method for preparing the carbon network can be carried out in the reactor 3 containing the reaction zone 3b and the termination zone 3c by the following operations: a single-phase emulsion c, which is a microemulsion containing metal catalyst nanoparticles, preferably a microemulsion containing CBFS Emulsion - injected into a temperature above 600°C, preferably above 700°C, more preferably above 900°C, even more preferably above 1000°C, more preferably above 1100°C, preferably up to 3000°C, more preferably up to 2500°C, Most preferably in reaction zone 3b at a temperature of up to 2000°C to produce porous carbon networks comprising chemically interconnected carbon nanofibers; transfer these networks to termination zone 3c; and terminate by spraying water d The formation of the porous carbon network comprising chemically interconnected carbon nanofibers in the zone is arrested or stopped. The single phase emulsion is preferably sprayed into the reaction zone. refer ...
Embodiment 1
[0095] Example 1: Electrical conductivity of polymeric materials comprising carbon networks containing carbon nanofibers
[0096] Using a blown film extrusion method using a blowing device BL 50T with a die length of 30 mm (in the case of 25% by weight carbon mesh) or using a cast film extrusion method using a cooling roll CR 72T (at 35 wt% carbon network), a 50 μm thick polypropylene copolymer (PPC, Moplen EP340M) layer comprising 25 wt%, 30 wt% or 35 wt% carbon nanofiber-containing carbon network was prepared. A carbon mesh was prepared using a manufacturing method similar to Example 1 in WO2018 / 002137, the content of which is incorporated herein by reference. The average intragranular pore diameter of the network was measured to be 20 nm using mercury intrusion porosimetry (ASTM D4404-10). A single screw extruder (Colllin; model Teach Line E20T; 42 L / D line; D=26 mm) was used to prepare the melt, the extruder set at 90 rpm for blown film extrusion and 90 rpm for cast fil...
Embodiment 2
[0101] Example 2: Viscosity of polymeric materials comprising carbon networks containing carbon nanofibers
[0102] The carbon network of the present invention is used to prepare antistatic films, static dissipative films or conductive films. For the membranes, (near) infiltration of the conductive filler is required, which is usually accompanied by a large decrease in the melt flow index (MFI) = increase in viscosity. It has now been found that with the carbon network of the present invention, melt flow is not impaired as much as with carbon black (CB). A decrease in melt flow index (MFI) means an increase in viscosity, which limits the ability to further process the mixture. Especially for drawn films, this is a key parameter to obtain a uniform film (same thickness and properties).
[0103] Table 2 shows the MFI data according to ISO standard 1133-2005, where PPC (PP copolymer) comprising the carbon network of the present invention was compared with PPC (PP copolymer) c...
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Abstract
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