Why is the high conductivity carbon black of silica gel not obvious after adding it? Rubber Conductive Carbon Black

When the silica gel covers the highly conductive carbon black particles with a liquid network, it has a dielectric coefficient and can have a large electrical conductivity, but if it becomes a two-component reaction cross-linked or vulcanized silica gel becomes an elastomeric polysiloxane, it is almost It is an insulator - each highly conductive carbon black particle is physically separated by a layer of silicone rubber film and loses its conductivity (or the conductivity is severely reduced) Silicone conductive carbon black

For example, the aluminum oxide dispersion of styrene is originally conductive, but after AIBN is heated and cross-linked into PS, the aluminum oxide inside is almost non-conductive, and can be used to prepare disposable thermal rheostat intermediate parts, please refer to it as appropriate.

Generally, monomers such as acrylate, PU, epoxy resin or unsaturated polyester before the liquid is cross-linked have a certain conductivity, and after cross-linking into a three-dimensional insoluble and infusible polymer, it is an insulator.

I have encountered this situation before when using two-component ATV silica gel. There is no good way except to increase the solid content of conductive carbon black and add some ionic surfactants to disperse as much as possible (in the alkane solvent oil of the raw rubber dilution solvent Appropriate addition of some water-oil two-soluble ionic compound zinc bromide can also increase part of the conductivity).

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