Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1997-05-13
1999-05-18
Mayekar, Kishor
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204164, 204165, H05F3/00
Patent
active
059048166
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the chemical modification of liquids containing alkyl groups, and to chemically modified liquids containing alkyl groups.
It is known that liquids containing alkyl groups, for example products, can be used in many areas. Use is possible, for example, in emulsions and dispersions For the processability of the liquids containing alkyl groups in the most varied areas of use, these liquids must be mixed with certain additives matched to the particular area of use. Owing to the great many possible fields of application, comprehensive uniform use of the liquids containing alkyl groups is thus impossible. discloses a process for the aftertreatment of solids containing alkyl groups. In this case the surface of the solid containing alkyl groups, for example a PE surface, is treated with a high-voltage plasma, in order to achieve local chemical modification. Owing to this local surface treatment, for example in the case of shaped components, an improvement of the coatability or printability is achieved. However, it is a disadvantage in this case that an additional aftertreatment must be performed whose use is possible only to a restricted extent owing to the provision of a high-voltage plasma unit for the finished product.
The object therefore underlying the invention is to create a process of the generic type by which a chemical modification of liquids containing alkyl groups is possible in a simple and inexpensive manner.
According to the invention, this object is achieved by means of the fact that the liquids containing alkyl groups are subjected to a plasma treatment in a frequency range from 10 kHz to 10 GHz. It has surprisingly been found that a modification of material properties can be induced within the liquids containing alkyl groups by means of the plasma treatment. In particular, by means of the plasma treatment of the liquid containing alkyl groups, special chemical products can be achieved which can be used in a varied manner without needing a chemical aftertreatment. By means of the plasma treatment, a high level of chemical modification in terms of quality and quantity can be achieved. A degree of the chemical modification of the liquids containing alkyl groups may preferably be achieved in a simple manner by setting parameters of the plasma treatment.
In an advantageous development of the invention it is provided that the plasma treatment is carried out with alternating frequencies, preferably with combinations of different alternating frequencies. Thus, the plasma treatment can highly advantageously be carried out with successively selectable frequencies, with alternately selectable different frequencies, with at least two simultaneously selectable different frequencies, and combinations of frequency selections resulting herefrom. By this means, the chemical modification can be highly advantageously matched to the variable chemical structure of the liquids containing alkyl groups used and to their application following the chemical modification.
In a further advantageous development of the invention, it is provided that the plasma treatment is carried out with supply of at least one inert gas, for example helium and/or argon and/or with supply of at least one reaction gas, for example oxygen and/or nitrogen. It is further preferred if the plasma treatment is carried out successively with an inert gas plasma and at least one reaction gas plasma and/or a reaction gas plasma mixture or with supply of a mixture of at least one inert gas and one reaction gas. By choosing a process gas composition during the plasma treatment (inert gas, reaction gas, reaction gas mixture) which is matched to the liquids containing alkyl groups which are to be modified, it is possible to incorporate the reactive groups which are necessary for the chemical modification, for example hydroxyl groups, carboxyl groups, primary and secondary amino groups, into the liquids containing alkyl groups to a sufficient extent. These incorporated groups are able to react with the liquid containing
REFERENCES:
patent: 5549795 (1996-08-01), Gregoire et al.
Chemical Abstracts, 26473d., vol. 81, No. 6, Aug. 12, 1974.
Kunststoff Taschenbuch, 25th Edition, pp. 258-259 (No Date Available).
Arplas Gesellschaft Fur Plasmatechnologie mbH
Mayekar Kishor
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