Airless spray-coating of a surface with a viscous aqueous...

B - Operations – Transporting – 05 – B

Patent

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Details

B05B 1/02 (2006.01) B05B 1/04 (2006.01) B05B 1/06 (2006.01) B05D 1/02 (2006.01)

Patent

CA 2576587

A process for the airless spray-coating of a surface with a viscous aqueous non-Newtonian architectural coating composition wherein the composition contains a preferably associative thickener and is subjected to a pressure of from 2.5 to 5 bar generated preferably by hand-operated compressor and then sprayed from a preferably slot-shaped outlet orifice (52) in a nozzle (50) to produce an outflow (31) of composition having boundaries (35) which diverge at least until it has formed a front of at least 30mm in width. The composition preferably has a Brookfield viscosity of at least 0.5 pa.sec and a solids content of 7 wt %. Also apparatus for performing the process comprising a container containing the coating composition together with a nozzle having an outlet orifice, a hand-operated compressor and a pressure release valve actuatable in the pressure range 2.5 to 5 bar and preferably an auxiliary orifice upstream of the outlet orifice. The process and apparatus enable the viscous compositions to be applied quickly using low pressures easily generated by a hand compressor.

L~invention porte sur un procédé de revêtement par pulvérisation sans air d~une surface avec une composition de revêtement architecturale non Newtonienne aqueuse visqueuse où la composition contient un épaississeur de préférence associatif et est soumise à une pression de 2,5 à 5 bars générée de préférence par un compresseur à commande manuelle, avant pulvérisation depuis un orifice de sortie de préférence en forme de fente (52) dans une buse (50) pour produire un écoulement de sortie (31) de composition ayant des limites (35) qui divergent au moins jusqu~à la formation d~un front d~au moins 30 mm de largeur. La composition a de préférence une viscosité Brookfield d~au moins 0,5 pa.sec et une teneur solide de 7 % en poids. L~invention porte également sur un appareil de réalisation du procédé comprenant un conteneur renfermant la composition de revêtement avec une buse ayant un orifice d~écoulement, un compresseur à commande manuelle et un détendeur actionnable dans la fourchette de pression allant de 2,5 à 5 bars et de préférence un orifice auxiliaire en amont de l~orifice d~écoulement. Le procédé et l~appareil permettent l~application rapide des compositions visqueuses à l~aide de basses pressions facilement générées par un compresseur manuel.

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