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Defoaming agent for water medium

A technology for defoamers and water-based media, which is applied in the field of defoamers for water-based media, and can solve problems such as difficult to reproduce and affect the activity of urea derivatives

Inactive Publication Date: 2008-01-09
TH GOLDSCHMIDT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This of course directly affects the activity of the resulting urea derivatives and, at the same time, at least leads to difficult, if not impossible, reproducible results in the context of their use as defoamers

Method used

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  • Defoaming agent for water medium
  • Defoaming agent for water medium
  • Defoaming agent for water medium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] At room temperature, 475 g of naphthenic mineral oil (40 mPas / 25° C.) were added to a vessel with a stirring device, 14.36 g of benzylamine were added, and the mixture was stirred for 5 minutes. After the addition of 10.64 g of 1,6-hexamethylene diisocyanate with stirring, a sudden formation of a colorless precipitate was observed. Then react for 60 minutes.

example 2

[0052] At room temperature, add 475g of polyether siloxane (400mPas / 25°C; refractive index n=1.440 / 25°C; insoluble in water) into a container with a stirring device, add 14.36g of benzylamine, and then stir the mixture for 5 minutes . After the addition of 10.64 g of 1,6-hexamethylene diisocyanate with stirring, a sudden formation of a colorless precipitate was observed. Then react for 60 minutes.

example 3

[0054] At room temperature, 475 g of naphthenic mineral oil (40 mPas / 25° C.) were added to a vessel with a stirring device, 2.78 g of diaminopropane were added, and the mixture was stirred for 5 minutes. After the addition of 22.22 g of octadecyl isocyanate with stirring, a sudden formation of a colorless precipitate was observed. Then react for 60 minutes.

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Abstract

The present invention relates to one kind of composition for defoaming water medium, and the composition includes carbamide derivative in the structure as shown, in solid grain form and serving a defoaming agent. The carbamide derivative is prepared through crystallizing clear homogeneous melt dispersed in carrier medium.

Description

technical field [0001] The present invention relates to an antifoaming agent for an aqueous medium comprising certain urea derivatives as hydrophobic solids critically affecting the antifoaming properties, and the urea derivatives are obtained by uniformly dispersing in a carrier medium Crystallized out of the clear melt to obtain the properties necessary for its special activity as a defoamer. Background technique [0002] In many industrial processes, especially when working in aqueous media, it is necessary to suppress or completely prevent the formation of undesired foam during manufacturing or processing operations. This can be achieved by adding substances known as anti-foaming or anti-foaming agents which prevent or destroy unwanted foam even when used in very low concentrations of up to about 0.001% by weight. Examples of such prior art defoamers are: silicone oils, mineral oils, hydrophobic polyoxyalkylenes, long-chain alcohols, and mixtures of these products and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
Inventor P·马斯R·苏克尔S·西尔伯T·埃布雷克特M·斯塔特吉恩W·乔斯滕M·吉普尔特
Owner TH GOLDSCHMIDT AG