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Organic silicon defoaming agent capable of being used for water-based coating material and preparation method thereof

A silicone defoamer, water-based coating technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve problems such as non-wetting performance

Active Publication Date: 2021-07-06
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the usual defoamers can only eliminate the foam in the system, and do not have wetting properties

Method used

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  • Organic silicon defoaming agent capable of being used for water-based coating material and preparation method thereof
  • Organic silicon defoaming agent capable of being used for water-based coating material and preparation method thereof
  • Organic silicon defoaming agent capable of being used for water-based coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1, the preparation of organosilicon defoamer 1

[0051] Including the following steps:

[0052] (1) Synthesis of isomeric alcohol ether-capped allyl polyether A1: Add 270 g of isomeric octadecyl alcohol and 1.5 g of potassium hydroxide into the reaction kettle for nitrogen replacement, heat in vacuum to 100° C. for dehydration, and cool to Inhale 580g of propylene oxide at room temperature, stir and heat up to 80°C for reaction, after the reaction of propylene oxide is completed, reduce to an appropriate temperature, vacuum inhale 176g of ethylene oxide, heat up to 80°C and stir for reaction again, and obtain 1026g of isomeric alcohols Polyether (1mol), add the above-mentioned isomeric alcohol polyether and 90g potassium methylate into the kettle, heat up to 105°C to react and remove the gas generated by the reaction, drop the temperature to 65°C and add 120g allyl chloride dropwise to the kettle Continue the reaction for 1 hour, add 10 g of acid clay and 10...

Embodiment 2

[0056] Embodiment 2, the preparation of organosilicon defoamer 2

[0057] Including the following steps:

[0058] (1) Synthesis of terminal isomeric alcohol ether-terminated polyether-modified silicone oil B2: a double-ended hydrogen-containing silicone oil with a molecular weight of 1000 g / mol and a hydrogen content of 0.2% and isomeric alcohol ether-terminated allyl polyether A1 is put into a three-necked round-bottomed flask equipped with a thermometer, a stirring rod, and a spherical condenser at a molar ratio of 1:2.2, and decompressed at 80°C for 2 hours, then add Cass with a total mass of 0.16% of the total reactant under nitrogen protection. Special catalyst, raise the temperature of the system to 120°C and keep it warm for 6 hours. After the reaction, the system is clear and transparent to obtain the end-group isomerized alcohol ether-terminated polyether modified silicone oil B2, with a molecular weight of 3000-3200g / mol, a colorless and transparent liquid.

[0059]...

Embodiment 3

[0061] Embodiment 3, the preparation of organosilicon defoamer 3

[0062] Including the following steps:

[0063] (1) Synthesis of terminal isomeric alcohol ether-terminated polyether-modified silicone oil B3: double-ended hydrogen-containing silicone oil with a molecular weight of 1500 g / mol and a hydrogen content of 0.13% and isomeric alcohol ether-terminated allyl polyether A1 is put into a three-necked round-bottomed flask equipped with a thermometer, a stirring rod, and a spherical condenser at a molar ratio of 1:2.2, and the water is removed under reduced pressure at 80°C for 2 hours, and then 0.18% Cass is added under nitrogen protection. Special catalyst, raise the temperature of the system to 130°C and keep it warm for 6 hours. After the reaction, the system is clear and transparent, and the terminal isomeric alcohol ether-terminated polyether modified silicone oil B3 is obtained. The molecular weight is 3500-4000g / mol, a colorless transparent liquid.

[0064] (2) Pr...

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Abstract

The invention relates to an organic silicon defoaming agent for a water-based coating material and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing isomeric alcohol ether terminated allyl polyether; (2) synthesizing end group isomeric alcohol ether terminated polyether modified silicone oil; (3) preparing silicon paste; and (4) preparing the defoaming agent. According to the invention, end group isomeric alcohol ether terminated polyether modified polysiloxane with a symmetrical structure is used, a hydrophilic eo chain segment, a hydrophobic po chain segment and an isomeric macromolecular alkyl alcohol ether group are simultaneously introduced to the end group of a polysiloxane chain, and the hydrophilic and hydrophobic properties of the polymer can be effectively adjusted by controlling the ratio of eo to po, so that better defoaming performance is realized; and the organic silicon defoaming agent disclosed by the invention has the advantages of easily available raw materials, simple process, good stability, capability of effectively eliminating foams of a water-based coating material system, excellent defoaming and foam inhibition performance, difficulty in causing the defects of shrinkage cavities and the like, good wetting performance and capability of saving the use amount of a wetting agent in the water-based coating material.

Description

technical field [0001] The invention relates to a preparation method of a silicone defoamer that can be used for water-based coatings, and belongs to the technical field of defoamer preparation. Background technique [0002] Water-based additives are an important component of water-based paint products. They are not used in a high proportion in the formula, but they can play a key role in improving and improving the performance of paints and coating films. In the process of coating construction, in order to reduce the generation of foam and the traces left by bubbles and form a beautiful coating film, defoaming agents must be used in coatings. Defoaming agents can also improve the gloss, durability and fluidity of coatings. and pigment dispersibility. [0003] There are three main types of common water-based defoamers: mineral oils, usually composed of carriers, hydrophobic particles, emulsifiers, etc. Polyether defoamers, such as polyoxyethylene ether, polyoxypropylene et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 张玉晗高源秦佃斌乔义涛李和甫
Owner WANHUA CHEM GRP CO LTD
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