Coating installation of an industrial mass production coating line including non-aqueous solvent composition as barrier liquid

Patent metadata

Field	Value
Publication number	US-11639447-B2
Application number	US-201916559314-A
Country	US
Kind code	B2
Filing date	Sep 3, 2019
Priority date	Nov 29, 2011
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

Coating installations are provided that include storage tanks for an aqueous base component and a non-aqueous hardener component, circulation lines for the components from the respective storage tanks, a mixer and an entrance to the mixer with a connection between each circulating line and the entrance to the mixer, and a release valve for the non-aqueous hardener component. The coating installation downstream of the non-aqueous hardener release valve is filled with a non-aqueous solvent composition comprising 0 to 10 wt. % of N-alkyl pyrrolidone, 0 to 5 wt. % of dimethyl sulfoxide, 10 to 50 wt. % of γ-butyrolactone, 10 to 50 wt. % of at least one monoalcohol, 10 to 60 wt. % of at least one organic solvent inert towards isocyanate groups, other than γ-butyrolactone, other than N-alkyl pyrrolidone, and consisting of carbon, hydrogen, oxygen and, optionally, nitrogen, and 0 to 10 wt. % of at least one additive.

First claim

What is claimed is:

1. A coating installation of an industrial mass production coating line for the application of a water-borne two-component polyurethane coating comprising:
storage tanks for an aqueous base component and a non-aqueous hardener component;
circulation lines for the components from the respective storage tanks,
a mixer for receiving the aqueous base component and the non-aqueous hardener component to form a water-borne two-component polyurethane coating composition and an entrance to the mixer with a connection between each circulating line and the entrance to the mixer;
a release valve for the non-aqueous hardener component in the connection between the circulating line for the non-aqueous hardener component and the entrance to the mixer;
a spray-application device for spraying the water-borne two-component polyurethane coating composition to form the water-borne two-component polyurethane coating and connecting pipework downstream of the release valve for the non-aqueous hardener;
wherein the coating installation downstream of the non-aqueous hardener release valve including the mixer, the spray-application devices, and connecting pipework is filled with a non-aqueous solvent composition comprising:
0 to 10 wt. % of N-alkyl pyrrolidone,
0 to 5 wt. % of dimethyl sulfoxide,
10 to 50 wt. % of γ-butyrolactone,
10 to 50 wt. % of at least one monoalcohol,
10 to 60 wt. % of at least one organic solvent inert towards isocyanate groups, other than γ-butyrolactone, other than N-alkyl pyrrolidone, and consisting of carbon, hydrogen, and oxygen and, optionally, nitrogen, and
0 to 10 wt. % of at least one additive.

2. The coating installation of claim 1 , wherein the non-aqueous solvent composition consists of:
0 to 5 wt. % of dimethyl sulfoxide,
10 to 50 wt. % of γ-butyrolactone,
10 to 50 wt. % of at least one monoalcohol,
10 to 60 wt. % of at least one organic solvent inert towards isocyanate groups, other than γ-butyrolactone, other than N-alkyl pyrrolidone, and consisting of carbon, hydrogen, and oxygen, and
0 to 10 wt. % of at least one additive selected from the group consisting of defoamers, wetting agents, and surfactants;
wherein the sum of the wt. % totals 100 wt. %.

Assignees

• Axalta Coating Systems Ip Co

Inventors

• Stoffel Petra
• Brunner Marcus

Classifications

• B05B15/55

  using cleaning fluids · CPC title

• C09D9/005

  containing organic solvents · CPC title

• B08B3/08

  the liquid having chemical or dissolving effect · CPC title

• B05B15/557

  the cleaning fluid being a mixture of gas and liquid · CPC title

• C09D7/20

  Diluents or solvents · CPC title