process and apparatus for airless spray coating of a surface with a non-Newtonian aqueous viscous architectural coating composition, and modification to an apparatus

摘要

PROCESS AND APPARATUS FOR AERIAL SPRAY COATING OF A SURFACE WITH A NON-NEWTONIAN WATERY ARCHITECTURAL COATING COMPOSITION, AND MODIFICATION IN AN APPLIANCE Process for airless spray coating with a viscous aqueous coating composition Newtonian where the composition contains a preferably associative thickener and is subjected to a pressure of 2.5 to 5 bar preferably generated by a manually operated compressor and then preferably sprinkled from a tear-shaped outlet orifice. (52) in a nozzle (50) to produce an outlet stream (31) of the composition having contours (35) that diverge at least until a front of at least 30 mm in width is formed. The composition preferably has a Brookfield viscosity of at least 0.5 pa.s, with a solids content of 7% by weight. Apparatus also for carrying out the process, which is comprised of a container containing the coating composition together with a nozzle having an outlet port, a compressor and a kind pressure release valve in the 2.5 to 5 bar pressure range. and preferably an auxiliary orifice upstream of the outlet orifice. A method and apparatus for allowing viscous compositions to be applied rapidly using low pressures easily generated by a hand-held compressor.