Colloid systems and wetting agents; subcombinations thereof; pro – Compositions containing an agent for breaking ; processes of... – Continuous liquid phase colloid system and discontinuous gas...
Patent
1997-09-02
2000-05-02
Lovering, Richard D.
Colloid systems and wetting agents; subcombinations thereof; pro
Compositions containing an agent for breaking ; processes of...
Continuous liquid phase colloid system and discontinuous gas...
1621643, 426329, 516134, B01D 1904, D21H 2112
Patent
active
060573759
DESCRIPTION:
BRIEF SUMMARY
This application is a U.S. national stage application filed under 35 U.S.C. .sctn.371, claiming priority of PCT/EP96/00257, filed Jan. 23, 1996, and DE 195.03 062.1, filed Feb. 1, 1995.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the use of alkoxylation products of epoxidized fatty compounds as defoamers in papermaking, in the food manufacturing field, for example in the production of sugar or starch, in fermentation, in the dyeing of textiles and in paints.
2. Discussion of the Related Art
In a number of industrial processes, the foaming attributable to the presence or use of surface-active substances represents a serious problem.
In papermaking, troublesome foam can be formed by the air introduced into the water circuit. For example, foam spots can appear on the paper when foam containing floated soil passes onto the paper web in the sheet forming process. In view of the increasingly faster machine speeds, the overall danger of air entering the fiber suspension is also increasing. This can result in disruption of the drainage of the paper stock on the paper machine and ultimately in irregular structures within the paper sheet. These well-known disadvantages are made even worse by the new papermaking machines with their closed white water systems because foam-forming and foam-stabilizing substances accumulate in the closed systems. As the foregoing observations suggest, there is a considerable demand in the industry both for defoamers which are capable of reducing foam that has already formed and for foam inhibitors which suppress the formation of foam. Foam inhibitors are expected to show spontaneous and long-term activity in small amounts.
In the industrial manufacture or processing of foods, considerable significance is attached to the control and prevention of foaming. For example, in the industrial processing of sugar-containing plant juices which is practised on a large scale in the production of sugar from sugar beet, particular difficulties are caused by excessive foaming at the juice recovery and purification stage and in the evaporators. The foam control agents to be used in the sugar industry must of course be physiologically safe. The same applies to the foam control agents used in the manufacture of potato products, such as crisps or french fries, or even in the production of baker's yeast using molasses. In addition, the foam control agents used in the potato-processing industry must be capable of regulating the starch foam which is difficult to control. Overall, foam control agents are always expected to show high spontaneous and long-term activity in small amounts.
Fats and oils, such as rapeseed oil, peanut oil, olive oil and also wool grease, have long been used for controlling foam in the sugar and yeast industry. Synthetic esters, such as fatty acid monoglycerides and diglycerides, fatty acid polyglycol esters, and synthetic alcohols, such as polyalkylene glycols and alkylene oxide adducts with fatty alcohols, have also been proposed for this purpose. Although a certain foam-suppressing effect can be achieved with these compounds, the quantities required are often too high or, alternatively, effectiveness is only guaranteed at certain temperatures.
In the case of paints and lacquers, particularly those based on water as sole or predominant solvent, air can be stirred in through homogenization of the lacquer or paint components. This is a particular disadvantage because either the user has to wait a very long time for these air bubbles to burst before he can begin applying the lacquer or paint or the lacquer or paint coating contains small air bubbles. Coatings such as these with surface defects are not only visually unattractive, they do not last very long either because the bubbles can burst, leaving holes or weak spots in the film.
Numerous classes of compounds have already been proposed with a view to eliminating the problems caused by foam.
DE-A1 40 38 608 proposes ring opening products of epoxidized triglycerides as defoamers in the food indu
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Daute Peter
Drees Wolfgang
Hornfeck Klaus
Kaps Dieter
Koester Rita
Drach John E.
Henkel Kommanditgesellschaft auf Aktien
J. Murphy Glenn E.
Lovering Richard D.
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