Defoaming formulations containing organopolysiloxanes

A technology of polysiloxane and defoamer, applied in the field of defoamer and defoamer formulation, can solve problems such as viscosity increase

Active Publication Date: 2021-02-05
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] A disadvantage when using initially crosslinked or in some cases rubbery polydimethylsiloxanes is that such formulations exhibit a large increase in viscosity with increasing storage time of the antifoam compound

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

[0317] Preparation of organosilicon compound (A):

[0318]a) Silicone compound A1 :

[0319] In a 500 mL three-necked flask, balance 101.0 g of dimethylsiloxy and vinyldimethylsiloxy units having an iodine value of 22.0 with 2.7 g of trimethylsiloxy units Hydrolyzate of hydromethyldichlorosilane end-capped and having about 55 Si units, 120.0 g of a product having a viscosity of 62 mm 2 / s (25.0°C; capillary II) of OH-terminated polydimethylsiloxane and 28.6g of polydimethylsiloxane with a viscosity of 35mm 2 / s (25.0 ° C; II capillary) the balance of dimethylsiloxy and trimethylsiloxy units at 120 ° C and 250 mbar under reduced pressure with 250 ppm PNCl 2 Equilibrate for 2 hours. By adding NaHCO 3 deactivate the catalyst. After filtration and removal of volatile components at 160 °C and a reduced pressure of 40 mbar, a product having a viscosity of 81 mm is obtained 2 / s (25.0°C; capillary II), polysiloxane with iodine value 13.3 and H content 0.016wt% A1 . 29 Si-N...

Embodiment 2

[0325] Preparation of organopolysiloxane (1):

[0326] a)Organopolysiloxane (1-1) :

[0327] In a 250mL three-necked flask, dissolve 100.0g of polysiloxane in 50mL of xylene A1 Together with 0.2 g of Karstedt Pt catalyst in toluene solution (Pt content: 0.3 wt %) heated to 90° C. for 3.5 h. 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 mPa·s (measured at 25° C. and a shear rate of 1 L / s) is obtained (1-1) .

[0328] Therefore, organopolysiloxane (1-1) The preparation uses only polysiloxane A1 , and the main component thus present is the structural element (IV), where x=52. (1-1) In the form of a non-gelling, flowable compound. Therefore, it is not necessary to use an inert solvent.

[0329] b)Organopolysiloxane (1-2) :

[0330] In a 250mL three-necked flask, 100.0g polysiloxane A2 Together with 55.0 g of linear vinyldimethylsilyl-terminate...

Embodiment 3

[0339] Preparation of non-inventive de1 defoamer formulations VC1, VC2 and VC3 using organopolysiloxanes (1-3) and V1:

[0340] To prepare antifoam formulations, substances (1), (2), (3), (6), (7) and (9) in Table 1 were mixed with solvent and heated to 150° C. for 4 hours. After cooling, components (5) and (8) are introduced again using solvent and homogenized.

[0341] General procedure for the preparation of antifoam formulations C1-C21 according to the invention using organopolysiloxanes (variant 1) :

[0342] To prepare the antifoam formulation, the substances (1), (2), (3), (4), (6), (7) and (9) in Table 1 were mixed with solvent and heated to 150°C for 4 hours . After cooling, components (5) and (8) are introduced again using solvent and homogenized.

[0343] Antifoam formulations C1-C21 according to the invention with organopolysiloxanes can also be prepared as follows (variant 2):

[0344] To prepare antifoam formulations, substances (1), (2), (3), (6), (7) an...

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Abstract

The invention relates to new defoaming formulations containing: (1) organopolysiloxanes containing, per molecule, at least one structural unit of general formula O1 / 2R2Si-Y-SiRO2 / 2 (I) and at least two units of general formula R1R2SiO1 / 2 (II) and units of general formula R2SiO2 / 2 (III), wherein R, R1 and Y have the meaning provided for them in claim 1, provided that the organopolysiloxane containsa structural element of formula R2Y2SiO-(SiR2O)x1-SiRY1O-(SiR2O)x2-SiR2R1 (IV), wherein Y1 and Y2 have the meaning provided for them in claim 1, and x1 and x2 are equal to 0 or are a whole number, provided that the sum is x1+x2=x, wherein, on average, x is greater than 5 and smaller than 100; (2) filling materials; (3) organopolysiloxane resins formed by units of general formula R2 e(R3O) fSiO(4-e-f) / 2 (V), wherein R2, R3, e and f have the meaning provided for them in claim 1; (4) silanol-containing organopolysiloxanes of general formula XSiR4 2O- (SiR4 2O)n-SiR4 2X (VI), wherein R4 and n have the meaning provided for them in claim 1, X represents a hydrogen atom, an optionally substituted C1-C18-hydrocarbon group, a C1-C18-alkoxy group or a hydroxy group -OH, provided that, on average, 30 to 60 mol%, preferably 50 mol%, of the groups X correspond with hydroxy groups -OH; and (5) inorganic or organic acids.

Description

technical field [0001] The present invention relates to antifoam formulations comprising organopolysiloxanes and their use as antifoam agents, especially in aqueous surfactant systems. Background technique [0002] In many liquid, especially aqueous, systems containing desired surface-active compounds or other undesired components, when these systems are brought into more or less intimate contact with gaseous substances, for example during the gas treatment of sewage, Foam generation can be problematic during intense agitation of liquids, during distillation, washing or dyeing or during filling. [0003] The foam can be controlled by mechanical means or by adding antifoams. Silicone-based defoamers have proven to be particularly useful. [0004] Improving the performance of silicone-based antifoams is an ongoing process. Numerous scientific papers (eg, Denkov et al. Langmuir, 1999, 15, 8514, Langmuir, 1999, 15, 8530 or, in general, P. Garrett, The science of defoaming, CR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C11D3/00C11D3/04C11D3/20C11D3/37D21C3/28D21H17/59D21H21/12
CPCB01D19/0409C11D3/0026C11D3/042C11D3/2075C11D3/373D21C3/28D21H17/59D21H21/12B01D19/0404B01D19/0418C08K2003/329C08L83/14C08L83/00C08K3/36C08K3/32
Inventor 马库斯·格郎德克里斯托弗·德克特伊丽莎白·赫茨尔维默科琳娜·扎格约瑟夫·维默尔
Owner WACKER CHEM GMBH
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