Formulation and application of compositions for the detackification of paint spray booth wastes
AssigneeNalco Chemical Company
InventorFrank A. Mauceri
Life of this patent
Estimating the term…
Abstract
Water used to wash the air in paint or lacquer spray booths in order to remove over-sprayed paint or lacquer is treated with a blend of a terpolymer containing 5-40% by weight of diallyl dimethyl ammonium halide, 5-75% by weight of N-vinyl-2-pyrrolidone, 10-60% by weight of acrylamide, and a water-soluble salt of an amphoteric metal to reduce the tackiness of paint and lacquer solids and thereby reduce the tendency of over-sprayed paints and lacquers to adhere to walls, ceilings and floors of said spray booths and also to condition the paint and lacquer solids removed with the water so that they can be separated and the water recycled for further use in washing the air in the spray booth.
Claims6
A composition for the clarification and detackification of alkaline paint spray booth wastes which comprises:
- A. 15-50% by weight of a water-soluble salt of an amphoteric metal;
- B. 1.0-15% by weight of a water-soluble cationic terpolymer containing prior to polymerization:
- 1. 5-40% by weight of diallyl dimethyl ammonium chloride;
- 2. 5-75% by weight N-vinyl-2-pyrrolidone;
- 3. 10-60% acrylamide, said terpolymer having a molecular weight of from 5,000 to 300,000;
- and
- C. 35-85% water.
A process for the clarification and detackification of alkaline paint spray booth wastes which comprises:
- A. adding to the paint spray booth wastes from 2.0-100,000 ppm of a composition consisting essentially of:
- 1. 15-50% by weight of a water-soluble salt of an amphoteric metal, said metallic salt being able to form an insoluble hydroxide at pH values greater than about 7;
- 2. 1.0-15% by weight of a water-soluble cationic terpolymer containing prior to polymerization:
- a. 5-40% by weight of diallyl dimethyl ammonium chloride;
- b. 5-75% by weight N-vinyl-2-pyrrolidone;
- c. 10-60% acrylamide, said terpolymer having a molecular weight of from 5,000 to 300,000;
- 3. 35-85% water;
- B. mixing the composition of Step A with the paint spray booth waste;
- C. allowing the composition to interact with the waste whereby the paint particles contained therein are coated by the hydroxide of the metallic salt and detackified;
- D. recovering a metallic hydroxide coated detackification paint particles whereby the aqueous paint spray booth waste is clarified.
Dependencies are inferred from the claim text.