Mixture for drying solids by the movement of water

Details Mixture for drying solids by the movement of water Mixture for drying solids by the movement of water

1998-06-24

2001-02-13

Carrillo, Sharidan (Department: 1746)

Cleaning and liquid contact with solids

Processes

With treating fluid motion

C134S026000, C134S027000, C134S029000, C134S032000, C134S034000, C134S042000, C252S008620, C252S194000, C510S400000, C510S410000, C516S144000

Reexamination Certificate

active

06187107

ABSTRACT:

FIELD OF THE INVENTION
The present invention is directed to compositions for drying solids. In particular, the invention is directed to compositions for drying solids, where the composition comprises a water repellent mixture of a halogenated solvent and a copolymeric silicone having a hydrophilic functional group.
BACKGROUND OF THE INVENTION
At the time of the mass manufacture of numerous types of objects it is frequently necessary to clean and dry the latter at the end of the production line. For example one can think of optical, mechanical or other parts. The cleaning operations terminate in washing and rinsing with water, but it is then necessary to eliminate the droplets of water which remain attached to the surface, in order to prevent the formation of an oxide and deposits of impurities or traces which would occur if the water was not eliminated or simply eliminated by evaporation.
In order to limit the labour costs, drying machines are used in which the objects are immersed in a bath of a product which detaches the droplets of water from the surface of the objects.
This product has low surface tension, so that it spreads by wetting over the entire surface of the objects and thus detaches the droplets of water attached to the latter. The droplets then rise to the surface of the bath, due to the difference in density, from which they are removed mechanically.
The products used hitherto for this drying operation have the drawback of being chlorinated products or chlorofluorocarbons of the CFC-113 type with the addition of a surface active agent having the effect of repelling water. It is the solvent which, having a greater wetting capacity due to the presence of the surface active agent, moves the water by detaching it from the object and without dissolving it.
Now, the use of chlorofluorocarbons is prohibited today in order to preserve the ozone layer. The applicant has thus sought to formulate a new bath free from CFC or HCFC.
SUMMARY OF THE INVENTION
The present invention is directed to a water-repellent mixture, for drying a solid having a surface with droplets of water attached to the surface by moving the droplets of water. The mixture comprises i) a halogenated solvent, selected from the group consisting of a totally halogenated molecule and a partially halogenated molecule with at least one hydrogen atom, intended to be interposed between the droplets of water and the solid surface, and to carry the droplets of water, after detachment from the solid surface, where the halogen is preferably fluorine, and ii) a copolymeric silicone having a hydrophilic function for surrounding the droplets of water, and thus controlling the interposition of the solvent between the droplets of water and the solid surface. Preferably, the copolymeric silicone is a polyalkylene oxide modified polydimethylsiloxane of formula:
where m is 0 to 100, and n ranges from 4 to 50, and R is a radical selected from the group consisting of a hydrogen atom, an alcohol group, an amine group and a polyalkyl group containing 1 to 5 carbon atoms.
The water-repellent mixture of the invention may further comprise a co-solvent selected from the group consisting of an alkane, a siloxane, an alcohol, and an aromatic as a solvent for the copolymeric silicone. Preferably, the silicone is present in an amount of from 0.02 to 10 percent, more preferably from 0.04 to 1 percent, and most preferably from 0.1 to 0.4 percent, by weight of the total of the mixture.


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