Process for reclaiming inorganic powders from polymer-based coating compositions

摘要

Processes for recovering inorganic powder materials from polymer-based coating compositions used to deposit a polymer-based coating. The process includes combining a polymer precursor, first solvent, and inorganic powder material to form a suspension, and applying the suspension to a substrate to form a layer. At least a portion of the suspension that did not adhere to the substrate is then collected. Residual portions of the first solvent and polymer precursor are at least partially removed from this portion of the suspension to yield a crude inorganic powder material comprising a residual portion of the inorganic powder and optionally a partially-cured polymer precursor, the latter of which can be removed by treating the crude inorganic powder material with a second solvent.

主权项

1. A process of recovering an inorganic powder material from a polymer-based coating composition, the process comprising:
combining at least a polymer precursor, a first solvent, and the inorganic powder material to form a suspension of the polymer-based coating composition; applying the suspension to a substrate so that a first portion of the suspension adheres to the substrate and forms a layer on the substrate; collecting a second portion of the suspension that did not adhere to the substrate, the second portion of the suspension comprising residual portions of each the first solvent, the inorganic powder material, and the polymer precursor and optionally further comprising a partially-cured polymer precursor formed from the polymer precursor; removing at least some of the residual portions of each the first solvent and the polymer precursor to yield a crude inorganic powder material comprising the residual portion of each the inorganic powder material and any partially-cured polymer precursor; and treating the crude inorganic powder material with a second solvent in which the partially-cured polymer precursor is soluble to dissolve at least a portion of any partially-cured polymer precursor; wherein the process further comprises at least partially removing the second solvent and any partially-cured polymer precursor dissolved therein from the crude inorganic powder material; and wherein the process yields the residual portion of the inorganic powder material substantially free of the polymer precursor and the first and second solvents.