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Defoaming agent for defoaming lacquers

A technology of defoaming and dispersing agent, applied in the field of defoaming agent for coating defoaming, it can solve the problems of filter blockage, poor filterability of defoamer, solid precipitation, etc., and achieve low viscosity, good filterability, enhanced Effects of filtration properties and pumpability

Inactive Publication Date: 2011-09-21
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] A disadvantage of the known method and of the defoamers obtained therefrom is the poor filterability of the resulting defoamers, with the result that, for example, in the filtration of deposit paints comprising the defoamers, the filter will be relatively clog faster
A further disadvantage of the known method and of the defoamers obtained therefrom is the total or partial settling of solids during storage

Method used

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  • Defoaming agent for defoaming lacquers
  • Defoaming agent for defoaming lacquers
  • Defoaming agent for defoaming lacquers

Examples

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preparation example Construction

[0111] The compositions according to the invention are obtainable by all known processes for the preparation of urea derivatives, provided that the reaction of the isocyanate compound with the amine compound is carried out in the presence of a monohydric alcohol of the formula VI. The reaction is preferably carried out according to the process route described in DE 32 45 482 .

[0112] The composition for defoaming of the present invention is more preferably prepared by the method of the present invention described below.

[0113] In the process according to the invention for the preparation of a defoamer or composition for defoaming an aqueous medium, in the presence of an alcohol of formula VI below the melting point of the resulting urea derivative of formula I, in one of the above The isocyanate is reacted with an amine in a support medium to obtain a urea derivative of formula I. As the alcohol, one of the aforementioned alcohols is preferably used, preferably 2-ethylhex...

Embodiment 1-12

[0125] Embodiment 1-12: Preparation of the defoaming composition of the present invention

[0126] In a stirred vessel, 50 g of support material (according to Table 1) are added, heated to temperature Y and mixed with 5 g of amine and 1 g of alcohol, and the mixture is stirred until it is completely homogeneous. After addition of an equimolar amount of isocyanate ISO at stirring speed Z, there is a post-reaction time t. The dispersing additive is optionally subsequently added at stirring speed Z in such an amount that the mass ratio of dispersing agent to the total amount of amine and isocyanate used is 1:1.

Embodiment 13-17

[0127] Embodiment 13-17: Preparation of contrast defoamer

[0128] Defoamers not according to the invention were prepared in the same manner without the alcohol according to the invention and without the use of a dispersant.

[0129] The carrier materials used are as follows:

[0130] T1 = Ecolane 100 (Total Deutschland GmbH)

[0131] T2 = 80% by weight of Ecolane 100 (Total Deutschland GmbH) and 20% by weight of 110 (Evonik Goldschmidt GmbH) Mixture of DD

[0132] T3 = mixture of 10% by weight of Indopol H 2100 (Innovene) and 90% by weight of poly-1-decene (50 MPas), (Aldrich Deutschland GmbH)

[0133] T4 = Nynas T 22 ( Petroleum (Stockholm, Sweden)

[0134] T5=TEGO STAB 8932 (BP 18100) (Evonik Goldschmidt GmbH)

[0135] T6=50% by weight of lithene PM (Sartomer) and 50% by weight of 110 (Evonik Goldschmidt GmbH)

[0136] The amines used are as follows:

[0137] A1 = Propylenediamine

[0138] A2 = Octylamine

[0139] A3 = diethyltriamine

[0140] The alcohols us...

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Abstract

The present invention relates to substances for defoaming aqueous media. Said substances contain urea derivatives of formula (I) in the form of solid particles as defoaming agents. In formula (I), R1 is a hydrocarbon group comprising 4 to 30 carbon atoms, a hydrocarbon group comprising 4 to 24 carbon atoms and a nitrogen atom, or a hydrocarbon group comprising 4 to 30 carbon atoms and a carbonyl group, R2 is a hydrogen atom or a hydrocarbon group comprising 1 to 24 carbon atoms, R3 is a hydrogen atom or a hydrocarbon group comprising 1 to 24 carbon atoms, R4 is an organic group comprising 2 to 30 carbon atoms, and n is a number between 0 and 5. The urea derivatives are obtained by reacting isocyanates with amines in a carrier medium. The invention is characterized in that the reaction is carried out in the presence of a monovalent alcohol of formula (VI) R8-OH, in which R8 is a linear or branched, preferably branched, alkyl group comprising 6 to 10 carbon atoms.

Description

technical field [0001] The present invention relates to defoamers for defoaming paints, preferably for use as defoamers for defoaming paints of the deposition coating materials type. The defoamers of the present invention comprise solids based on urea derivatives. Background technique [0002] In numerous industrial processes, especially when operating in aqueous media, it is necessary to suppress or completely prevent the formation of undesired foam during production or processing operations. This can be achieved by mixing the medium to be defoamed with substances known as antifoams or defoamers, which prevent or destroy unwanted foam even when used in very low concentrations above about 0.001% by weight. bubbles. Examples of this prior art antifoaming agent include silicone oils, mineral oils, hydrophobic polyoxyalkylenes, long-chain alcohols, and mixtures of these substances with each other and emulsions thereof. To intensify its activity, so-called hydrophobic solids ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C09D7/12C10M171/00B41J2/19C07C275/14C07C273/18C09K23/42C09K23/52
CPCC10M2209/102C10N2230/18C10N2240/40C08K5/21C10M2215/102C10M171/004C10M173/02B01D19/0413C10M2209/106C10M133/20C09D7/1233C07C275/14C10M2203/1006B01D19/0404C10N2250/12C10N2030/18C10N2040/20C10N2050/015C09D7/47
Inventor P·卡瓦莱罗P·法夫雷斯B-J·德甘斯M·施万S·沃尔克默
Owner EVONIK DEGUSSA GMBH