Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1993-02-12
1994-07-05
Green, Anthony
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210735, 210930, 252181, 252DIG8, C02F 154, B03D 302
Patent
active
053264800
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to agents, which are formulated in the form of two components, for coagulating paints, waxes and coating compositions, to aqueous slurries thereof, and to the use of said coagulants in circulation waters of paint disposal units.
STATEMENT OF RELATED ART
If paints, waxes or similar coating materials containing water-insoluble organic substances are applied to metal surfaces or plastics surfaces, e.g. in the automotive industry, it is not practicable to apply the paints or coating materials completely onto the parts to be coated without leaving behind any residual portions thereof. More specifically, when automotive bodies are being painted, in the paint spray booths there is formed the so-called "overspray" which is removed from the paint spray booths by means of water and is flushed into a so-called "stabilization basin". Chemicals for coagulating said materials will have to be added to said water so that, on the one hand, malfunctions caused by sticking paint particles on the water conducting conduits, nozzles and sprinkler systems will be avoided and, on the other hand, the ingredients entrained in the circulating water will be removed for the disposal thereof. The addition of the chemicals is intended in one operation to effect detackification of the spattered paint particles present in the water and to cause said paint particles to agglomerate so as to form a coagulum capable of being discharged.
For coagulating conventional paints used above all in the automotive industry, there is available a series of neutral and alkaline products. To accomplish coagulation, i.e., detackification of the paint particles and agglomeration thereof to form a coagulum capable of being discharged, powdery alkaline or liquid alkaline as well as powdery neutral products have been added to the water circulated in the paint spray booths and in the connected conduits and aggregates.
The agents known so far have some inherent drawbacks if used for the coagulation of conventional paints: Thus, they need some relatively long time to coagulate the paint
particles and to satisfactorily dispose of the water used for discharging excessive paint mist. In adverse cases, an insufficient detackification resulted in a deposition of paint particles sticking to one another in conduit systems directly connected to the paint spray booth. In addition, most of the coagulants known in the prior art contain substances (for example inorganic anions such as chloride or sulfate) which used to accumulate in the circulating water and acted corrosively upon parts of the unit. The frequent changes of the bath caused thereby were considered to be increasingly disadvantageous. Since an increase of the use-life of the disposal baths is to be desired for water-technological reasons, it is undesirable to use a combination including substances which quickly accumulate in the disposal baths and, thus, impair the function of the unit for various reasons.
In the processes known so far from prior art for the coagulation of paints and coating agents it was largely a matter of the existing technical facilities whether either a paint-coagulating agent was used that caused the coagulum to float, i.e. to buoy up, in the stabilization basin or whether a coagulant had to be employed which caused the coagulum to sediment. In the former case it was possible to skim off the coagulum from the water surface, while in the latter case the sedimented coagulum was removed from the bottom of the basin by means of a scraper conveyor. However, in the course of time, paint disposal lines have come into use wherein it was required to maintain the detackified and coagulated paint particles in a state of uniform dispersion. Thus, depending on the type and quality of the paint, it was required to influence the specific behavior of the paint particles in the individual cases by promoting sedimentation of paints tending to float so that a uniform dispersion could be obtained, or by causing an increased floating of paints having an i
REFERENCES:
patent: 4380495 (1983-04-01), Maher
patent: 4541931 (1985-09-01), Geke et al.
patent: 4629477 (1986-12-01), Geke
patent: 4629572 (1986-12-01), Leitz et al.
patent: 4687520 (1987-08-01), Seng
patent: 4699730 (1985-05-01), Miles et al.
patent: 5034136 (1991-07-01), Cody et al.
patent: 5130028 (1992-07-01), Cody et al.
patent: 5248440 (1993-09-01), Mitchell et al.
Ullmanns Enzyklopadie der technischen Chemie, vol. 24, pp. 1-49, 4th edition, 1984.
Fette, Seifen, Anstrichmittel 67, 1965, pp. 334-340.
Rompps Chemie-Lexikon, Franck'sche Verlagshandlung, Stuttgart, p. 4562, 8th edition, 1988.
Fehr Hans
Geke Juergen
Margeit Ragnar
Green Anthony
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
Wisdom, Jr. Norvell E.
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