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Polyether modified organic silicon defoamer and preparation method thereof

A silicone defoamer, polyether modification technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve problems such as difficult balance, achieve less steps, anti-foaming performance and compatibility The effect of sexual optimization and improvement, operation safety

Active Publication Date: 2018-02-23
佛山市南海大田化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing polyether modified silicone defoamers have the following defects: compatibility and defoaming performance are an antagonistic relationship, which is difficult to balance

Method used

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  • Polyether modified organic silicon defoamer and preparation method thereof
  • Polyether modified organic silicon defoamer and preparation method thereof
  • Polyether modified organic silicon defoamer and preparation method thereof

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preparation example Construction

[0040] A preparation method of polyether modified silicone defoamer (reaction flow shown in reaction formula I), comprising:

[0041] One reaction step: mix polyether-modified silicone B (structural formula IV) with tetramethyldihydrodisiloxane (hydrogen-containing double head, structural formula VI), add a strong acid solution, react at room temperature for 6-10 hours, and Equilibrium reaction obtains the first reaction product (structural formula VII);

[0042] Secondary reaction step: mix the first reaction product with linear α-olefin (structural formula V), add catalyst, react at 20-80°C for 2-6h, and obtain polyether-modified organic compound after addition reaction Defoamer for Silicon A (Formula I).

[0043]

[0044] As a further embodiment, in one reaction step, polyether modified silicone B is a commercially available polyether modified silicone product, for example selected from Momentive Silwet DA-33, Silwet DA-63, Silwet DA-40, Silwet SPM-2, Silwet SPM-1, Sil...

Embodiment 1

[0053] A preparation method of polyether modified silicone defoamer (reaction flow shown in reaction formula I), comprising:

[0054] One reaction step: use commercially available polyether-modified silicone B (structural formula IV) and hydrogen-containing double head (tetramethyldihydrodisiloxane, structural formula VI) in a ratio of 1:1 at 98% concentration Under the condition of sulfuric acid, react at normal temperature for 8h to obtain the first reaction product (structural formula VII); in the first reaction product, z=20, x=y=2, R 1 , R 2 The polyether structure is the same (structural formula II), where m=n=12, R 4 is a hydrogen group;

[0055] Secondary reaction step: first reaction product and linear α-olefin (CH 2 =CH(CH 2 ) p CH 3 , p=13) reaction, the reaction conditions are: chloroplatinic acid as catalyst, 40-60 ℃, react for 4h, finally obtain the defoamer containing polyether modified silicone A (structural formula I), in the structural formula I, z =20...

Embodiment 2

[0057] A preparation method of polyether modified silicone defoamer (reaction flow shown in reaction formula I), comprising:

[0058] One reaction step: use commercially available polyether-modified silicone B (structural formula IV) and hydrogen-containing double head (tetramethyldihydrodisiloxane, structural formula VI) in a ratio of 1:1 at 98% concentration Under the condition of sulfuric acid, react at normal temperature for 8h to obtain the first reaction product (structural formula VII); in the first reaction product, x=2, y=6, z=40, R 1 , R 2 For different polyether structures (structural formula Ⅱ), in R 1 m=0, n=24, R 4 is methyl; in R 2 where m=10, n=0, R 4 is methyl;

[0059] Secondary reaction step: first reaction product and linear α-olefin (CH 2 =CH(CH 2 ) p CH 3 , p=9) reaction, the reaction conditions are: chloroplatinic acid as catalyst, 40-60 ℃, react for 4h, finally obtain the defoamer containing polyether modified silicone A (structural formula I),...

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Abstract

The invention discloses a polyether modified organic silicon defoamer. Polyether modified organic silicon A is taken as a main component; different groups are introduced into the polyether modified organic silicon A in the manner of adjusting a molecular structure of silicon ether copolymer; polyethylene oxide chain links (EO) and polypropylene oxide chain links (PO) are contained in R1 and R2 polyether section structures, so that the product has certain hydrophily and permeability; R3 is a long-chain alkyl, has lipophilicity, is capable of supplying de-foaming and foam-inhibiting functions and is capable of balancing the lipophilicity and the de-foaming property, so that the polyether modified organic silicon defoamer disclosed by the invention has the advantages of organic silicon defoamer and polyether defoamer and the de-foaming and foam-inhibiting properties and the compatibility are optimized and improved. The invention also discloses a preparation method for the polyether modified organic silicon defoamer. The preparation method is characterized by few steps, simple process, low requirement for production conditions and operation safety.

Description

technical field [0001] The invention relates to the technical field of defoamers, in particular to a polyether modified silicone defoamer and a preparation method thereof. Background technique [0002] There are many types of defoamers on the market with different performances. If we only divide them from the types of defoamers, the more common ones are: mineral oil defoamers, polyether defoamers and silicone polyether modified defoamers wait. Among them, mineral oil defoamers are widely used in inks, adhesives, coatings, etc. Mineral oil defoamers have good compatibility, but have problems such as poor durability. Polyether defoamer has good water solubility, high temperature resistance and strong alkali resistance, but its defoaming speed and foam suppression time are not ideal. Therefore, polyether chains are introduced into polysiloxane chains through condensation technology grafting, so that it has the advantages of both polyether defoamers and silicone defoamers, and...

Claims

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Application Information

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IPC IPC(8): C08G77/38C08G77/14B01D19/04
CPCB01D19/0409C08G77/14C08G77/38
Inventor 刘颖欣燕临凡杨丽英林超群覃月伦朱晓琪梁莉芬
Owner 佛山市南海大田化学有限公司
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