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Polyether modified organosilicon, defoamer composition and application thereof

A technology of polyether modification and silicone, which is applied in the field of defoamer composition and polyether modified silicone, which can solve the problems of reducing the defoaming ability of the effective part of hydroxyl-containing polyether modified silicone, so as to avoid defoaming Effect of hydrogen side reaction and excellent defoaming ability

Active Publication Date: 2019-04-19
AFCONA CHEM HAIMEN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that while the double bond undergoes an addition reaction with silicon hydrogen, part of the hydroxyl group also undergoes a dehydrogenation reaction with silicon hydrogen to form a by-product, thus reducing the effective portion of the hydroxyl-containing polyether modified silicone and the final defoaming ability

Method used

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  • Polyether modified organosilicon, defoamer composition and application thereof
  • Polyether modified organosilicon, defoamer composition and application thereof
  • Polyether modified organosilicon, defoamer composition and application thereof

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Embodiment Construction

[0050] Below, the content of the present invention is further described with examples, but the protection scope of the present invention is not limited to examples. Other changes and modifications made by those skilled in the art without departing from the spirit and protection scope of the present invention are still included in the protection scope of the present invention.

[0051] The first is the description of the preparation method of hydroxyl-containing polyether modified silicone:

[0052] Hydroxyl-containing polyether modified silicone A (molecular weight 1380, hydroxyl value 81mgKOH / g):

[0053] The molecular formula of 62.4g is Me 3 SiO(Me 2 SiO) 3 (MeSiHO) 4 SiMe 3 Hydrogen-containing silicone oil and 0.03g of 2wt% chloroplatinic acid butyl acetate solution are put into the reaction flask, nitrogen protection is carried out and the temperature is raised to 100°C, and 40.8g of allyl polyether (molecular weight is 204 , full EO type, the tail end is CH 3 ) an...

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Abstract

The invention relates to a polyether modified organosilicon, a defoamer composition and application thereof. The structural general formula of the polyether modified organosilicon is shown as the specification. According to the invention, firstly hydrogen-containing silicone oil, allyl polyether (non-hydroxy ended) and allyl glycidyl ether are subjected to hydrosilylation to obtain modified organosilicon containing polyether unit and epoxy group simultaneously, then a substance containing active hydrogen, i.e. a compound containing COOH, OH, SH or NH is employed for reaction with the epoxy group in the above modified organosilicon to generate hydroxyl, and then hydroxyl-containing polyether-modified organosilicon can be obtained. Finally, the hydroxyl-containing polyether-modified organosilicon, hydrophobic fumed silica particles, an emulsifier and deionized water are combined to form a waterborne organosilicon defoamer emulsion. The method adopted by the invention efficiently prepareshydroxyl-containing polyether-modified organosilicon, avoids dehydrogenation side reaction, and the finally formed waterborne defoamer composition has excellent defoaming ability in waterborne paintor waterborne ink.

Description

technical field [0001] The invention relates to a polyether modified silicone, a defoamer composition and applications thereof. Background technique [0002] With the requirements of environmental protection and the development of science and technology, water-based paint or water-based ink products have gradually replaced solvent-based products and become mainstream products in the market. Because water-based paint contains a certain amount of surfactant, it is easy to generate bubbles that are difficult to eliminate on the surface and inside of the paint film during production, transportation, and construction. The existence of bubbles not only affects the decorative performance of the coating film, but more importantly, seriously reduces the protective function and service life of the coating film. [0003] CN101903074 uses mineral oil, hydrophobic silicon dioxide particles, emulsifier and water to form a complex, which can be used as a defoamer for acrylate water-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/46C09D7/65C09D7/61C09D11/00
CPCC08G77/46C09D11/00C09D7/61C09D7/65
Inventor 王志军
Owner AFCONA CHEM HAIMEN
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