Method of treating wet paint spray booth

Details Method of treating wet paint spray booth Method of treating wet paint spray booth

2000-10-30

2001-06-19

Delcotto, Gregory (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Clay or inorganic aluminosilicate salt component

C510S504000, C118S326000

Reexamination Certificate

active

06248711

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to method of treating a wet paint spray booth. Particularly, this invention relates to a method of treating a wet paint spray booth with using a wet paint spray booth treating agent for diminishing tackiness of paint in circulating water to be sprayed for collecting the surplus paint and preventing the paint from adhering and fixing to an interior of the wet paint spray booth.
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
In a painting process of an automotive industry, yield of paint sprayed to an automobile body is generally from 60 to 80% and 40 to 20% of the sprayed paint constitutes a surplus paint to be removed in a subsequent process. The surplus paint sprayed excessively is usually collected in a wet paint spray booth by water washing and the washing water is circulated for re-use.
In the wet paint spray booth, since the surplus paint collected in the washing water has high tackiness, it adheres to a water-film panel, a piping system and a nozzle, and seriously degrades the efficiency of water washing. Moreover, the greater part of the surplus paint settles to the bottom of the booth pit and the bottom of the circulation pit in the spray booth, and the settled paint hardens into a rubbery state with elapse of time to take much time and labor for removal thereof.
For the solution of problems described above, a paint spray booth treating agent as follows has been be added to the washing water:
1) alkali including NaOH or KOH
2) amphoteric metal salts including Zn salt
3) cationic polymers and metal salts, and
4) bentonite (montmorillonite, hectorite)
It is known that sepiolite is added to waste water including oily matters and then the water is subjected to solid-liquid separation. However it is unknown to add sepiolite to the wet paint spray booth treating agent.
Among the conventional wet paint spray booth treating agents mentioned above, the effect of the alkalis for the reduction in the tackiness is not enough. The amphoteric metal salts and the cationic polymers require to be added in large amounts so that concentration of the salts is increased to cause corrosion of materials, The effect of the bentonite for the reduction in the tackiness is not enough so that a large amount of the cationic polymer is required to be added simultaneously.
Japanese patent publication 10-140045 discloses a paint composition capable of removing a toxic substance from a coated article. The paint composition contains a powdery or finely particular activated carbon and at least one kind of an activated carbon to which a toxic substance remover is stuck such as an amine compound or titanium oxide and a powdery or finely particular porous material such as sepiolite or zeolite. W093/02147 (entered into Japanese phase and published as Toku hyohei 6-509371) discloses an agent for removing tackiness of paint which comprises an inorganic aluminum compound and an organic polymer comprising a quaternary nitrogen atom.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to solve conventional problems described above and to provide a method of treating a wet paint spray booth with using a wet paint spray booth treating agent which can effectively reduce the tackiness and decrease the load of the agents so that corrosion is prevented.
The wet paint spray booth treating agent of the present invention comprises sepiolite.
The wet paint spray booth treating agent of the present invention may further comprise at least one of cationic polymer and amphoteric metal compound.
In the method of treating a wet paint spray booth of the present invention, sepiolite and at least one of the cationic polymer and amphoteric metal compound are added into circulating water of the wet paint spray booth.
Details of the effect of the wet paint spray booth treating agent of the present invention for the reduction in the tackiness is supposed as follows.
The sepiolite is water-containing magnesium silicate having a chemical formura Mg
8
Si
12
O
30
(OH)
4
(OH
2
)
4
.8H
2
O. The sepiolite is a fibrous mineral containing chain structures having lots of micropores so that the sepiolite can reduce the tackiness of the paint due to adsorption of the paint particles into the micropores thereof.
Since both the particles of the paint and the particles of the sepiolite are negatively charged, when the cationic polymer or the amphoteric metal compound is used in combination with the sepiolite, the electrical repulsion is reduced so that the paint particles become easy to be adsorbed to the sepiolite particles whereby reducing the tackiness of the paint particles.


REFERENCES:
patent: 4790954 (1988-12-01), Burba et al.
patent: 5409630 (1995-04-01), Lysy et al.
patent: 5473033 (1995-12-01), Kuo et al.
patent: 5773706 (1998-06-01), Wesley et al.

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