During the storage of epoxy floor paint, the viscosity of the coating increased until it was colloidal. Thickening is the phenomenon that the viscosity increases due to solvent evaporation or improper solvent use or oxidation polymerization. Thickening sometimes has thixotropy, or due to the expansion of pigments and physical pigments caused by the strong vibration can be restored to the original consistency. Because of the reaction between the paint base and the pigment, the consistency becomes particularly high, serious tofu-like or lump-like, known as gelatinization. The phenomena of gelatinization and thickening are irreversible and different from thixotropic phenomena.
The reasons for thickening and gluing in epoxy floor construction are as follows: the main reason for thickening is that the pigments used react with the paint base, such as zinc white, lead white and other salt-based pigments react with the organic acids in the paint base to form metal soap, causing gelation and solidification; the container is not completely sealed or not filled barrels, part of the storage process. Solvent volatilization, so that paint concentration, thickening, oxygen in the air can also promote gelatinization; paint storage site temperature should not be too high, so do not store in sunlight, radiator or furnace.
Because the viscosity of the paint base containing thermosetting resin increases when heated, it becomes gelatinized; if an inappropriate diluent is added, the viscosity will increase when the diluent with weak solubility is used.
The solution to the thickening and gelling of epoxy floor construction is: some lacquer base should avoid using salt-based pigments, instead of zinc barium white, titanium white, antimony oxide and other pigments, the pH value of carbon black is low, usually a small amount of triethanolamine is added to overcome; the container must be sealed, such as open barrel after use, preferably in 2-3 days. Or use it within a week; store it in a suitable environment; choose the right solvent or add a solvent with strong solubility.
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