Adjustable jet disperser for producing aqueous two-component polyurethane paint emulsions
AssigneeBayer Aktiengesellschaft
InventorsBernd Klinksiek, Dieter Schleenstein, Wieland Hovestadt, Michael vom Felde
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Abstract
The invention relates to a process for the production of aqueous two-component polyurethane lacquer emulsions, with variable throughput, and to the use thereof as high-quality lacquers and coatings.
Claims4
A process for the production of an aqueous two-component polyurethane coating emulsion comprising pumping a mixture of at least one polyisocyanate and an aqueous binder dispersion under a pressure of 1 to 30 MPa through a disperser, said disperser comprising:
- a) a ceramic sleeve having bores or slots in the wall thereof, with said bores or slots communicating with one end of a pipe, said pipe having an open end remote from said end communicating with said bores or slots,
- a1) said ceramic sleeve having an open end,
- a2) said ceramic sleeve further having a moveable solid ceramic piston located opposite said open end,
- a2i) with the movement of said moveable ceramic piston being such that flow through said bores or slots can be enabled or completely closed, and
- a2ii) with said movement being caused either via a pneumatic drive or an electric step motor,
- wherein the ceramic sleeve and the ceramic piston are ground in to fit accurately in order to avoid leakage between the piston and the sleeve,
- and wherein said mixture is pumped into the open end of said ceramic sleeve, through said bores or slots, and through said pipe.
A process for the production of an aqueous two-component polyurethane coating emulsion comprising pumping a mixture of at least one polyisocyanate and an aqueous binder dispersion under a pressure of 1 to 30 MPa through a disperser, said disperser comprising:
- b) a ceramic sleeve having bores or slots in the wall thereof, with said bores or slots communicating with one end of a pipe, said pipe having an open end remote from said end communicating with said bores or slots,
- a1) said ceramic sleeve having an open end,
- a2) said ceramic sleeve further having a moveable ceramic piston located opposite said open end,
- a2i) with the movement of said moveable ceramic piston being such that flow through said bores or slots can be enabled or completely closed, and
- a2ii) with said movement being caused either via a pneumatic drive or an electric step motor,
- wherein the ceramic sleeve and the ceramic piston are ground in to fit accurately in order to avoid leakage between the piston and the sleeve,
- and wherein said mixture is pumped into said pipe, through said bores or slots and through said ceramic sleeve.
Dependencies are inferred from the claim text.