Agitating – Having specified feed means – Adjustable mixing ratio control
Reexamination Certificate
1999-10-04
2001-09-18
Walker, W. L. (Department: 1723)
Agitating
Having specified feed means
Adjustable mixing ratio control
C366S155100, C366S155200, C366S162200, C366S168100, C366S181100, C366S261000, C366S316000, C366S605000, C366S167100, C366S172100, C366S172200, C366S317000
Reexamination Certificate
active
06290386
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a mobile appliance for the production of water-based liquid paints from pulverulent constituents and water, in particular on the foundation of dispersion powders, and to a method for the production of water-based liquid paints by means of the dispersal of dispersion powder compositions in water, using this appliance.
SUMMARY OF THE INVENTION
Water-based liquid paints, particularly dispersion paints, are produced by the paint manufacturers at the factory in large-size-dissolvers. The dissolvers are high-speed agitators with toothed discs which give rise to an outstanding dispersing effect as a result of the high circumferential speed at the toothed ring. In the factory production of dispersion paints, first water, if appropriate in mixture with secondary constituents, such as wetting agents, anti-foaming agents and preservatives, is administered in the dissolver and, with the agitator running at high speed, pigments and fillers are slowly introduced. After the dispersing operation has ended, the pigment paste thus obtained is intermixed with a plastic dispersion as binder, with the agitator running at slow speed. The finished paint is delivered in cans which have a water fraction in the dispersion paint of 30 to 50%.
For the production of dispersion paints, plastic powders (dispersion powders) redispersible in water may also be employed. Dispersion powders are plastic powders which can be stirred into water to form a stable aqueous plastic dispersion. With the development of plastic powders redispersible in water, such as the VinnapaS® dispersion powders of Wacker-Chemie, there is now the possibility of avoiding transporting the large water fraction in the dispersion paint and of mixing the dispersion paint directly at -the processing point by means of a powder mixture and water. The procedure hitherto in this case has been to stir the dispersion powder or the powder composition containing the dispersion powder into the mixing water on the spot by means of a wooden stirrer or a drilling machine equipped with an agitator. As a rule, this procedure does not achieve the same quality as in the case of a liquid dispersion paint produced at the factory in permanently installed dissolvers. The reason for this is that the shearing forces necessary for the good dispersing effect cannot be achieved in this procedure.
The object was, therefore, to develop a mobile, easy-to-handle appliance, by means of which it is possible to produce from pulverulent constituents on the spot, for example for use on a building site, a liquid paint having a quality which corresponds to that of dispersion paints produced at the factory.
The subject of the invention is a mobile appliance for the production of water-based liquid paints from pulverulent constituents and water, comprising a travelling frame
1
with
a) a mixing unit which consists of a mixing motor
2
and of the dissolver
3
and which can be lowered into the mixing container
5
via a spring
4
, and
b) a metering unit with a metering motor
6
, with the metering container
7
having a conveying element
8
and with the filling funnel
9
, and
c) a switching unit
10
with control elements for controlling the metering operation and the mixing operation.
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Derwent Abstract corr. to DE 3930337 A (AN 91-081479).
Derwent Abstract corr. to FR 2535643 A (AN 84-069254).
Baumgartl Horst
Berner Detlev
Brooks & Kushman P.C
Sorkin David
Wacker-Chemie GmbH
Walker W. L.
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