Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1995-11-13
1998-01-06
Warden, Robert J.
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 29, 134 34, B08B 300, B08B 304, B08B 308
Patent
active
057049912
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The present invention presents an improved system and composition for washing dirty surfaces, and which is especially developed for washing vehicles.
It is previously known numerous types of washing compositions to be used when washing e.g. vehicles, but all of these compositions are meant to be used together with either manual washing or with rotating brushes or hanging cloth which mechanically remove dust and dirt from the surface. Such manual or mechanical washing is, however, abrasive on the surface and may in many cases destroy the finish or the paint on the vehicle. Previously it has also been attempted to hose off the layer of dust from the surfaces of the vehicle, but it has been found that the layer of dust adheres so strongly that spraying or hosing even at high pressure has not been satisfactory even with the addition of known washing solutions.
The need to clean vehicles without any mechanical treatment has increased, and has been the basis for attempts to find solutions to this problem the last 10 years by using different kinds of compositions and systems. The common factor for all these compositions is that the surface does not become fully clean on account of a fine layer which will often remain and which is not being removed by high pressure spraying in combination with a cleaning composition without using strong compositions which will have negative effects on the surf ace of the vehicle, and will also represent a negative effect on the environment and corrode the car.
Many manufacturers have attempted to use acids and/or alkaline solutions and also combinations thereof, but the side effects with corrosion both on the car itself and also on sewer systems etc.
SUMMARY
According to the present invention it has surprisingly been found that a composition comprising a mixture of a water-soluble cellulose derivative, such as a hydroxyl cellulose derivative, e.g. ethyl hydroxy cellulose, in a neutral to alkaline aqueous dispersion mixed with an alkaline detergent, will form, an agglomerate when it is added to the surface which is to be rinsed, and which partially adsorbs and partially absorbs the dirt particles so that they no longer adhere to the surface and easily may be hosed off together with the agglomerate. This saves to a large degree the surface and represents a significant improvement of the cleaning result compared with the previously known washing compositions.
The new effect of the present washing solution and system is that it is made more viscous in the foaming process and that it is preferably supplied with non-abrasive fiber particles in the rinsing/hosing process substituting the mechanical work being necessary in the previous car-washing systems as mentioned supra.
The surprising effect of the cleaning solution and process according to the present invention is that each of the cellulose derivative solution and the alkaline solution are readily water-soluble, but corresponding concentrations of stem solutions mixed directly with each other are not soluble. Thus a one-component system with these two stem solutions is not possible, and the two stem solutions enter a temporary semi-stable condition when mixed with water in a container/feeding tank immediately prior to its introduction into the foam generator, from which the combined foam may be sprayed onto the surface which is to be cleaned, and whereupon the composition is congealing absorbing and adsorbing all the dirt particles onto which it is applied. On account of the limited stability of the washing composition according to the invention, only a quantity large enough to clean one or a small number of vehicles or cars is made continuously as needed, and the foaming process increases the volume of the solution to such a degree that the pre-made quantity is enough to clean the vehicle. In this connection a quantity of 2-10 1 premade non-foamed cleaning solution according to the invention will cover an ordinary vehicle/car when expanded as a foam, and the volume of such a foam may be increased 3-8 times. Alter a d
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McCutcheon's Functional Materials, 1992 vol. 2 pp. 262-280, Mc Cutcheon Division, McPublishing Co.
Hawley's Condensed Chemical Dictionary, 1993 Van Nostrand Reinhold Company.
Ernest W. Flilck, Advanced Cleaning Product Formulations, 1989, pp. 240 and 314.
Ing. Thor Marcus Kjemiske AS
Markoff Alexander
Warden Robert J.
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