Last issue we introduced the floating bead in light floating bead insulation brick. Hope this can bring help to furnace builders. This issue we will continue to introduce the forming of foam (cavity) in light floating bead insulation brick.
The dispersion formed by dispersing an insoluble gas in a liquid or molten solid is called a foam, and the foam composed of a liquid film and a gas is a two-phase foam. Its formation is closely related to the particle size and surface tension of the liquid dispersion medium.
The aqueous solution of the dispersion medium silicate has high viscosity. But it is too high in interfacial energy to produce foam. The addition of a surfactant to the dispersion can reduce the interfacial energy. The surfactant molecules are composed of hydrophilic polar groups and hydrophobic non-polar groups.
It can be aligned on any two-phase interface layer to balance the incompatibility of the interface to some extent. Thereby, the surface tension is lowered, and the more the surface tension is lowered, the more the amount of suction on the interface is increased, so that the adsorption layer which is more closely arranged can be formed, thereby increasing the strength of the interface film. .
So a good foaming agent molecule must have a relatively strong mutual attraction in the sucking layer, and at the same time, the hydrophilic group has a strong hydrating power. The soap is an excellent foaming agent. It is dispersed in the medium of sodium silicate aqueous solution. Under the action of mechanical force, the whole system vibrates, thereby disturbing the air at the interface, causing intense impact, and some liquid envelops the gas to form a two-phase foam.
This issue we mainly introduced the forming of foam (cavity) in light floating bead insulation brick. Next issue we will continue to introduce process flow of production of light floating bead insulation brick. Please stay tuned.
