Defoamer formulations

A technology of preparation and defoamer, which is applied in the field of application of aqueous media, and can solve problems such as not too active, hydrolytically unstable, etc.

Inactive Publication Date: 2008-05-28
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the presence of water, this antifoam formulation becomes less active
[0009] Antifoam formulations prepared according to prior art are either not always sufficiently active or are not stable to hydrolysis

Method used

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  • Defoamer formulations

Examples

Experimental program
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Effect test

preparation example Construction

[0150] (A) Preparation of siloxane defoamer

[0151] A1: Use a colloid mill (0.6mm gap) to make 94 parts with a viscosity of 12 500mm 2 / s of polydimethylsiloxane and 6 parts of hydrophilic silica were homogenized three times. The silica was hydrophobized in situ by heating the mixture at 190° C. for 10 hours.

[0152] A2: The viscosity of 400 parts is 65mm 2 / s of hydroxyl-terminated polydimethylsiloxane, 40 parts viscosity is 40mm 2 / s of trimethylsiloxy-terminated polydimethylsiloxane, 4 parts of methyltrimethoxysilane and 1 part of 0.5% phosphorus nitrogen chloride (phosphorus nitride chloride) catalyst were heated to 100°C. The pressure was reduced to 35 mbar over the course of 20 minutes. Thereafter the catalyst was neutralized with 0.03 parts of triisooctylamine. The obtained polyorganosiloxane viscosity is 19 000mm 2 / s. To 95 parts of this oil was added 5 parts of pretreated hydrophobic silica, and the mixture was homogenized with a colloid mill.

[0153] A3:...

Embodiment 1-3

[0167] Embodiment 1-3 (C11, C12, C13) and comparative test 1 and 2 (CV11, CV12 and CV13):

[0168] With regard to the antifoam preparations C11, C12, C13 of the invention and the antifoam preparations CV11, CV12 and CV13 according to the comparative test, by combining 90 parts of the silicone antifoam indicated in the table with 10 parts in The polysiloxane copolymers indicated in the table were prepared by simple mixing using a pilot dissolver. As far as the test is concerned, the test dissolver is used for 1000min -1 Prepare 20 parts of this defoamer formulation and 80 parts with a viscosity of 3mm 2 / s, a mixture of aliphatic hydrocarbons with a flash point > 100°C.

[0169] The results of the activity tests are summarized in the table.

Embodiment 4-6

[0170] Embodiment 4-6 (C21, C22, C23) and comparative experiment 3-5 (CV21, CV22, CV23 and CV24):

[0171] For the antifoam formulations C21, C22, C23 of the invention and the antifoam formulations CV21, CV22, CV23 and CV24 according to the comparative test, 20 parts of the silicone defoamer indicated in the table, 5 parts of dehydrated Sorbitan monostearate, 5 parts of polyoxyethylene (40) stearate and 5 parts of polysiloxane copolymer indicated in the table were mixed at 70°C. Mix 10 parts of a 1% xanthan gum solution with 0.5% formaldehyde as a preservative in 600 min using a surface stirrer -1 Stir down. Add 55 parts of water part by part in the course of 3 minutes, then in 1000min -1Stir for 15 minutes.

[0172] The results of the activity tests are summarized in the table.

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Abstract

The invention relates to defoamer formulations which comprise (A) siloxane-based antifoam agents and (B) polysiloxane copolymers which are obtainable by reacting, in a first step, organopolysiloxanes (1) which comprise at least one Si-bound hydrogen atom, preferably at least two Si-bound hydrogen atoms, per molecule, with the substantially linear oligomer or polymer compounds (2) of the general formula R<1>-(A-CnH2n)m-A<1>-H (I), wherein R<1> represents a monovalent optionally substituted hydrocarbon group to which Si-H groups can be attached in a hydrosilylation reaction, preferably a hydrocarbon group comprising an aliphatic C-C multiple bond, A represents a divalent, polar organic group selected from the group comprising -O-, -C(O)-O-, -O-C(O)-, -O-C(O)-O-, -C(O)-NH-, -NH-C(O)-, a urethane group and a urea group, preferably an oxygen atom -O-, A<1> represents a divalent, polar organic group selected from the group comprising -O-, -NH- and -NR'- (whereby R' represents a monovalent hydrocarbon group with 1 to 18 carbon atoms), n is an integer from 1 to 20 and m is a positive integer, and, in a second step, reacting the intermediate products (4) so obtained which comprise H-A<1> groups with organic compounds (5) having at least two isocyanate groups per molecule, with the proviso that the water content of the compounds (1) and (2) used for producing the polysiloxane copolymers is less than 2000 % ppm, based on the total weight of compounds (1) and (2) .

Description

technical field [0001] The present invention relates to defoamer formulations comprising (A) silicone-based antifoams and (B) polysiloxane copolymers, and their use in defoaming aqueous media, especially those obtained in pulp production . Background technique [0002] In many liquid systems, especially in aqueous systems containing desired surface-active substances or other undesired components, if these systems are more or less intensively exposed to gaseous Problems due to foaming can then arise during stirring, during distillation, washing or coloring operations, or, for example, during dispersion processes. [0003] This foam can be controlled by mechanical means or by adding defoamers. Antifoams based on silicones have proven to be particularly suitable for this. [0004] Silicone defoamers are prepared, for example, according to DD-A 056 762 by heating hydrophilic silicon dioxide in polydimethylsiloxane. This process is very expensive and inconvenient, and, among ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/458C08G18/61B01D19/04
CPCC08G77/458B01D19/0409C08G18/61C08L83/04B01D19/04
Inventor W·布格尔C·赫尔齐希J·维默尔
Owner WACKER CHEM GMBH
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