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Defoaming compositions

A composition and defoaming technology, applied in the direction of foam dispersion/prevention, separation method, liquid degassing, etc., can solve the problems of limiting the applicability and disadvantages of the composition, and achieve the effect of good availability and short time

Inactive Publication Date: 2002-04-17
COGNIS IP MANAGEMENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In turn, the detrimental effects of such residues must be counteracted by the addition of other ingredients, such as conditioning substances, which would adversely limit the applicability of the resulting compositions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-14

[0041] Commercially available (PA-1, PA-2) and laboratory-made antifoaming composition samples were prepared, and their antifoaming properties were compared with conventional paint tests. The experimental samples include silicon dioxide which becomes hydrophobic by dry roasting with silicone oil at 205°C for 6 hours (DR-A to D-G) and the hydrophobic agent of the present invention: no catalyst, 2 hours at 130°C (VAC-H to VAC-L). Experimental recipes were designed so that all samples were of comparable concentration and composition. In other words, the experimental design characteristics will be directly comparable and reflect the effect of the hydrophobization method. The results are listed in Table 1.

[0042]

[0043] The significant difference in bubble collapse time shows that the antifoam composition obtained by the present method is more effective than either the commercially available prior art product or the antifoam composition prepared by slow dry roasting...

Embodiment 15-20

[0045] Examples 15-20 compare the performance of two commercially available products (PA-1 and PA-2) with antifoam compositions containing silica made hydrophobic by a catalyzed in situ method, the Silica which has been crushed under high pressure (F) was also compared with two antifoam compositions of the present invention containing hydrophobic silica which had been crushed under high pressure (G) and in-line mixer (H) for crushing. The results are listed in Table 2.

[0046] Example

[0047] The results in Table 2 show that the hydrophobic silica of the present invention can be prepared into defoaming compositions through a method that consumes less energy and quickly, and they have better performance than previous hydrophobization methods and compositions.

Embodiment 21

[0049] Polysurfactants such as those described in US Pat. No. 5,728,895 were used in place of silicone oil as the hydrophobic agent in the same weight percent. The mixture was treated at 140°C and 80 mm Hg vacuum for 2 hours and ground to reduce the average particle size. The properties of the resulting compositions are shown in Table 3.

[0050] Example

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Abstract

Silica is rendered hydrophobic by a catalyst-free, in-situ process that includes contact with a hydrophobing agent under vacuum at elevated temperature for a time sufficient to replace adsorbed water in the silica with the hydrophobing agent. The resulting dispersion of hydrophobic silica in an inert, liquid, hydrophobic carrier medium is then subjected to high shear forces for a time sufficient to produce a homogeneous dispersion of hydrophobic silica particles in a defoaming composition.

Description

field of invention [0001] The present invention relates to defoaming compositions, methods of making them and methods of using them. Background technique [0002] Foam generated in paper and pulp mills disturbs many processes, which can affect the efficiency of refiners, pumps, screens, centrifugal cleaners, deinking equipment, and dewatering equipment. Foam will also adversely affect final sheet formation, porosity, opacity, printability, smoothness, and interlayer bond strength. Excessive foaming can lead to loss of fiber and raw material. Further, the filtration rate of the paper on the papermaking wire can be affected by the presence of entrapped air in the wet paper web. When a paper or pad has a large number of trapped air cells, the filtration rate is reduced because water passing through the paper or pad must also pass through the air cells. [0003] However, hydrophobic silica compositions are still the defoamers of choice in many major industrial and medical tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409Y10T428/2995B01D19/04C01B33/14
Inventor R·W·布拉德本特D·施瓦缇亚
Owner COGNIS IP MANAGEMENT GMBH