Process for imparting an electrostatic charge to powders to...

Details Process for imparting an electrostatic charge to powders to... Process for imparting an electrostatic charge to powders to...

B - Operations, Transporting

05

D

B05D 1/06 (2006.01)

Patent

CA 2201878

The invention relates to a process for imparting an electrostatic charge to organic powders to render them useful for powder coating applications, which comprises forming a blend of said powders and a polyalkylene ether as an electrostatically active modifying agent to improve the charge on said powders, and subjecting said blend to electrically inductive or conductive conditions, wherein said powders have a resistivity of from about 10 9 to about 10 13 ohm-meters at about 20 percent relative humidity. The electrostatically active modifying agent may also be a polyalkylene glycol or a polyethoxylated stearyl alcohol.

Procédé permettant d'appliquer une charge électrostatique à une cmposition de poudre résineuse, pour l'application électrostatique d'un revêtement sur des objets solides, et procédé d'application d'un tel revêtement. Cette poudre résineuse comprend: i) une résine thermodurcissable ou thermoplastique et ii) un agent modifiant les propriétés électrostatiques incorporé dans la résine ou appliqué sur sa surface. Le procédé d'application de la poudre consiste à charger les particules de poudre par des moyens d'induction/conduction électrique (28), et à pulvériser la poudre chargée par un ajutage (24) sur un substrat solide (26) mis à la terre, auquel elle adhère avant qu'une fusion thermique ne soit effectuée pour produire un fini permanent.

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