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Defoaming formulations containing organopolysiloxanes

A technology of polysiloxane and defoamer, which is applied in the direction of defoamer, anti-foam pulping process, detergent compounding agent, etc., and can solve problems such as difficult to handle products, uncertainty, poor reproducibility, etc.

Active Publication Date: 2019-04-26
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, these methods are highly indeterminate, generally exhibit poor reproducibility and often provide difficult-to-handle products because they operate near the gel point

Method used

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  • Defoaming formulations containing organopolysiloxanes
  • Defoaming formulations containing organopolysiloxanes
  • Defoaming formulations containing organopolysiloxanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0258] Production of organosilicon compound (A):

[0259] a) Silicone compound A1 :

[0260] In a 500ml three-necked flask, the balance (equilibrate) of dimethylsiloxy and vinyldimethylsiloxy units with an iodine value of 101.0g of 22.0 and 2.7g of trimethylsiloxy units ( Trimethylsiloxy unit) end-blocking and hydrolyzate of hydromethyldichlorosilane with a chain length of about 55 Si units, 120.0g OH-end-blocking polydimethylsiloxane (viscosity of 62mm 2 / s) (25.0°C; capillary number II) and the balance of 28.6g dimethylsiloxy and trimethylsiloxane units (viscosity of 35mm2 / s) (25.0°C; capillary number II) with 250ppm of PNCl 2Equilibrate for two hours at 120° C. and a reduced pressure of 20 mbar. by adding NaHCO 3 deactivate the catalyst. After filtration and removal of volatile components at 160 °C and a reduced pressure of 40 mbar, the polysiloxane is obtained A1 , its viscosity is 81mm 2 / s (25.0°C; capillary number II), the iodine value is 13.3, and the H content...

Embodiment 2

[0268] Production of organopolysiloxane (1):

[0269] a)Organopolysiloxane (1-1) :

[0270] In a 250 ml three-necked flask, 100.0 g of polysiloxane was dissolved in 50 ml of xylene together with 0.2 g of Karstedt Pt catalyst in toluene solution (Pt content: 0.3% by weight) A1 Heat to 90°C for 3.5 hours. During the final cooling, 0.3 g of diallyl maleate was added. The xylenes were removed at 90° C. and a reduced pressure of 32 mbar. A polysiloxane with a viscosity of 425 mPas (measured at 25°C and a shear rate of 11 / s) was obtained (1-1) .

[0271] organopolysiloxane (1-1) The production therefore uses only polysiloxane A1 , so the main component is the structural unit (IV), where x=52. (1-1) Is in the form of a flowable compound that does not tend to gel. Therefore it is not necessary to use inert solvents.

[0272] b)Organopolysiloxane (1-2) :

[0273] In a 250ml three-necked flask, 100.0g polysiloxane A2 With 55.0 g of linear vinyldimethylsilyl-terminated pol...

Embodiment 3

[0295] Production of antifoam formulations C1-C4 according to the invention comprising organopolysiloxanes (1) and production of antifoams not according to the invention Dosage formulations VC5-VC9:

[0296] To produce antifoam formulations, the substances described in Table 1 were mixed with a dissolver and heated to 150°C in the presence of 1500ppm KOH (20% methanol solution) for 4 hours, and after cooling, the dissolved Homogenize again.

[0297] Table 1 Composition of the defoamer formulation

[0298]

[0299] 1) Comparative Test VC6 according to EP 516 109 A1

[0300] 2) Comparative Test VC7 according to EP 434 060 B2

[0301] 3) Comparative test VC8 according to WO 2011 / 069868 A2

[0302] 4) Comparative test VC9 according to EP 217 501 A2

[0303] Substances used:

[0304] D1: BET surface area is 300m 2 / g of hydrophilic pyrogenic silica (available from Wacker Chemie AG, Germany under the trade name T30 obtained)

[0305] E1: a solid silicone resi...

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Abstract

The invention relates to defoaming formulations containing: (1) organopolysiloxanes containing, per molecule, at least one structural unit of general formula O<1 / 2>R2Si-Y-SiRO<2 / 2> (I) and at least 2units of general formula R1R2SiO<1 / 2> (II) and units of general formula R2SiO<2 / 2> (III), wherein R has the designation indicated in claim 1, R1 is the same as R or an alkenyl radical containing between 2 and 30 C atoms, at least one alkenyl radical being contained per molecule, and Y is a bivalent hydrocarbon radical containing between 2 and 30 C atoms, provided that the organopolysiloxane contains a structural element of formula R2Y2SiO-(SiR2o)<x1>-SiRY<1>O-(SiR2o)<x2>-SiR2R1 (IV), in which Y1 is a bivalent hydrocarbon radical containing between 2 and 30 C atoms, which is bound to a group offormula SiR2O<1 / 2>, Y2 is a bivalent hydrocarbon radical containing between 2 and 30 C atoms, which is bound to a group of formula SiRO<2 / 2>, and x1 und x2 are equal to 0 or a whole number, providedthat the sum is x1+x2=x, x on average being larger than 5 and smaller than 100; (2) fillers; and (3) organopolysiloxane resins from units of general formula R<2><e>(R<3>O)fSiO<(4-e-f) / 2> (V), in whichR2 and R3 have the designations indicated in claim 1, e is 0,1, 2 or 3, and f is 0, 1, 2 or 3, provided that the sum e+f is smaller than or equal to 3 and, in less than 50% of all units of formula (V) in the organopolysiloxane resin, the sum e+f is equal to 2.

Description

technical field [0001] The present invention relates to defoamer formulations comprising organopolysiloxanes and their use as defoamers, especially in aqueous surfactant systems. Background technique [0002] In many liquid, especially aqueous systems containing surface-active compounds as desired or undesired constituents, when these systems come into more or less intimate contact with gaseous substances, for example during aeration of waste water (gas treatment), under vigorous stirring Foam formation can be problematic during liquid processes, during distillation, washing or dyeing, or during filling steps. [0003] The foam can be controlled by mechanical means or by adding defoamers. Silicone-based defoamers have proven particularly useful. [0004] Improving the performance of silicone-based antifoams is an ongoing process. Many scientific papers (eg Denkov et al. Langmuir, 1999, 15, 8514, Langmuir, 1999, 15, 8530 or generally P. Garrett, The science of defoaming, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04D21C3/28C11D3/00
CPCC11D3/0026C11D3/373C11D3/3734D21H17/59D21H21/12B01D19/0409D21C3/28C08L2205/035C11D3/3738C08L83/04C08L83/00C08K3/36
Inventor 克里斯托夫·布莱姆维利巴尔德·布格尔沃尔夫冈·齐凯
Owner WACKER CHEM GMBH
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