Process and apparatus for spraying without pneumatic assistance without pneumatic assistance a surface with a viscous aqueous architectural coating composition

摘要

a process and apparatus for spray-free coating of a surface with a viscous aqueous architectural coating composition, and a viscous aqueous architectural coating composition. Disclosed is a process, apparatus and coating composition for spray-free coating (e.g., airless) a surface with a viscous aqueous architectural coating composition (e.g., a paint) suitable for hiding marks on surfaces whose composition has a non-Newtonian flux and contains a binder polymer and above 30% by weight of solid ingredients (especially those chosen from thickeners, opacifiers, pigments and diluents) wherein the composition is expelled through a hole in a nozzle under a pressure of 2, 5 to 5 bar that can be generated by a hand or electric pump. a suitable composition has a brookfield viscosity of at least 0.5 pa and preferably not exceeding 50 pa if it contains a predominantly associative thickener for spraying through an oblate or circular orifice, or alternatively has an apparent extensional viscosity of 0.10%. 05 to 0.5 pa.s. preferably, the nozzle has devices for imparting a transverse force to the composition so that it enters the orifice with swirling motion.