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Antifoam compositions

A composition and organic technology, applied in the directions of detergent compositions, antifoaming agents, foam regulating compositions, etc., can solve problems such as being difficult to handle

Inactive Publication Date: 2013-01-09
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in strongly foaming, surfactant-rich systems, the known antifoam formulations do not always have a sufficiently long-lasting effectiveness and compatibility, or, due to high viscosities, according to the degree of branching or achieved degree of cross-linking, difficult to handle

Method used

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  • Antifoam compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] Example 1 (invented):

[0153] Mix and homogenize 21 parts of organopolysiloxane B1, 16 parts of organopolysiloxane B2, 3 parts of filler C1, 1 part of filler D1, 1 part of organopolysiloxane resin F1, and 1 part of organopolysiloxane Siloxane G1 and heated at 150° C. for 4 hours in the presence of 1500 ppm KOH. Then add 52 parts of organopolysiloxane A1 and 6 parts of polyether siloxane E1 and mix well.

[0154] The viscosity and defoamer index of the composition are shown in Table 1.

Embodiment 2

[0167] Mix and homogenize 27 parts of organopolysiloxane B2, 2 parts of filler D1, 1 part of organopolysiloxane resin F1, and 1 part of mineral oil H1, and heat at 150°C for 4 Hour. Then add 60 parts of organopolysiloxane A1, 6 parts of filler C2 and 8 parts of polyether silane E1 and mix well.

Embodiment 3

[0180] 100 parts of antifoam formulation from Example 1 at 60°C with 30 parts of sorbitan monostearate (available from Croda GmbH under the name "Span 60" D-Nettetal) and 20 parts of polyoxyethylene (20) Sorbitan monostearate ("Tween 60" from Uniqema D-Emmerich) was mixed and diluted with 500 parts of water. To this mixture was added 2 parts polyacrylic acid (available as "Carbopol 934" from BF Goodrich D-Neuss), followed by mixing and adding a further 345 parts of water and 3 parts of isothiazolinone-based preservative (available from Thor- Chemie, D-Speyer's "Acticide MV"). Subsequently, the emulsion was homogenized at 100 bar using a high-pressure homogenizer, and adjusted to a pH of 6-7 with 10% NaOH.

[0181] The resulting antifoam emulsion is excellent for use in aqueous antifoam surfactant solutions.

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Abstract

Novel compositions containing (A) organopolysiloxanes having a viscosity of 10 - 350 mm2 / s at 25 DEG C and 1013 hPa, (B) organopolysiloxanes having a viscosity of 500 - 200 000 mm2 / s at 25 DEG C and 1013 hPa, (C) precipitated silicas having a BET surface area of 20 - 500 m2 / g, (D) pyrogenic silicas having a BET surface area of 100 - 500 m2 / g, (E) polyethersiloxanes having a cloud point below 50 DEG C, (F) optionally organopolysiloxane resins, (G) optionally organopolysiloxanes which are different from (A) and (B), and (H) optionally water-insoluble organic compounds are described.

Description

technical field [0001] The present invention relates to compositions comprising organosilicon compounds having different viscosities, processes for their preparation, and their use as defoamers. Background technique [0002] Many liquid systems, more especially aqueous systems, contain desired surface-active compounds or other undesired components if these systems come into more or less intense contact with gaseous substances, e.g. during degassing of wastewater, vigorous stirring Foaming can be problematic during liquids, during distillation, during washing or coloring operations, or during dispensing. [0003] This foam can be controlled by mechanical means or by adding defoamers. Antifoams based on silicones have proven to be particularly suitable. Silicone-based defoamers are prepared according to US 3,383,327A, for example, by heating hydrophilic silica in polydimethylsiloxane. The effectiveness of such defoamers is improved using a basic catalyst as disclosed in US ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C11D3/00C11D3/37D21C3/28D21H21/12C08L83/04
CPCD21H21/12C11D3/0026D21C3/28C11D3/373B01D19/0404C08G77/18B01D19/0409B01F17/0071C08L83/04C09K23/54C08L83/00B01D19/04C11D3/37
Inventor 理查德·贝克尔维利巴尔德·布格尔霍尔格·保奇克
Owner WACKER CHEM GMBH
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