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Defoaming agent for coating and ink emulsion and preparation method of defoaming agent

A defoaming agent and ink technology, applied in ink, coating, application, etc., can solve the problems of long defoaming time of defoaming agent, poor product stability, short foam suppression time, etc., and achieve long foam suppression time, defoaming The effect of improving defoaming and antifoaming performance in a short time

Active Publication Date: 2021-07-13
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing silicone defoamer formula is complicated, and the defoaming time of the developed defoamer is long, and the foam suppression time is too short (the defoaming time in the prior art is generally more than 15 s, and the foam suppression time is less than 13 minutes )
[0004] CN102120108A introduces a mineral oil defoamer with polyether and white carbon black as the main defoaming substances, but white carbon black is directly added, and there is a defect of poor product stability
CN101310814A has introduced a kind of mineral oil defoamer, has added silicone grease to improve defoaming and suppressing performance, but can produce coating shrinkage cavity, edge shrinkage problem in water-based system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a defoamer for paint and ink emulsion and its preparation method.

[0042] 1) Preparation of long-chain alkyl and polyether composite modified silicone oil;

[0043] Take 50g of hydrogen-containing silicone oil with a hydrogen content of 0.08%, add 24g of allyl polyether (EO / PO block polyether, the molar ratio of EO / PO is 1:3, end-blocked with methyl, molecular weight 300); Add 3.36g of dodecene; make Si-H in hydrogen-containing silicone oil and CH in allyl polyether and long-chain olefin 2 = The ratio of the sum of moles of CH is 1:2.5. Add 203 μL of platinum metal (the mass of platinum metal accounts for 10×10 of the total mass of hydrogen-containing silicone oil, allyl polyether, and long-chain olefin. -6 wt%), reacted at 100°C for 6 hours, took samples to detect the conversion rate of the reaction, when the conversion rate reached more than 98%, stopped the reaction, lowered to room temperature and discharged, and prepared long-chain alkan...

Embodiment 2

[0049] This embodiment provides a defoamer for paint and ink emulsion and its preparation method.

[0050] 1) Preparation of long-chain alkanes and polyether composite modified silicone oil:

[0051] Take 50g of hydrogen-containing silicone oil with a hydrogen content of 0.18%, add 65.52g of allyl polyether (EO / PO block polyether, the molar ratio of EO / PO is 1:3, end-capped with ester group, molecular weight 500) ; Add 7.34g hexadecene; Make Si-H in hydrogen-containing silicone oil and CH in allyl polyether 2 = The molar ratio of CH is 1:1.82. Add 161 μL of platinum metal (the mass of platinum metal accounts for 5×10 of the total mass of hydrogen-containing silicone oil, allyl polyether, and long-chain olefin. -6wt%), reacted at 110°C for 4 hours, and took samples to detect the conversion rate of the reaction. When the conversion rate reached more than 98%, the reaction was stopped, and the material was lowered to room temperature to prepare long-chain alkane and polyether c...

Embodiment 3

[0057] This embodiment provides a defoamer for paint and ink emulsion and its preparation method.

[0058] 1) Preparation of long-chain alkanes and polyether composite modified silicone oil:

[0059] Take 50g of hydrogen-containing silicone oil with a hydrogen content of 0.75%, add 189g of allyl polyether (EO / PO random polyether, the molar ratio of EO / PO is 1:0, no end capping, molecular weight 600); add 19.84 g Octadecene; make Si-H in hydrogen-containing silicone oil and CH in allyl polyether 2 = The molar ratio of CH is 1:1.05. Add 70.60 μL of platinum metal (the mass of platinum metal accounts for 1×10 of the sum of the mass of hydrogen-containing silicone oil, allyl polyether, and long-chain olefin. -6 wt%), reacted at 140°C for 2 hours, took a sample to detect the conversion rate of the reaction, when the conversion rate reached more than 98%, stopped the reaction, lowered to room temperature and discharged, and prepared long-chain alkane and polyether composite modifi...

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PUM

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Abstract

The invention belongs to the technical field of fine chemical assistants, and particularly relates to a defoaming agent for water-based paint and ink emulsion and a preparation method of the defoaming agent. The method comprises the following steps: firstly, carrying out hydrosilylation reaction on hydrogen-containing silicone oil, EO / PO block or random allyl polyether and long-chain alkyl olefin to prepare long-chain alkane and polyether composite modified silicone oil; after the addition reaction, adding modified fumed silica to obtain silicon paste. finally, mixing span 80, Tween 80, carboxymethyl cellulose sodium, a thickening agent and the silicon paste; and after adding water, emulsifying and dispersing at a high speed to prepare the defoaming agent. According to the method, an organic solvent does not need to be added, the preparation method is simple, and the obtained defoaming agent is short in defoaming time, long in foam inhibition time and free of floating oil by regulating and controlling the molar ratio and molecular weight of polyether EO / PO, and has a good application prospect in the field of defoaming agents of coatings and printing ink.

Description

technical field [0001] The invention belongs to the technical field of fine chemical additives, and in particular relates to a defoamer for paint and ink emulsion and a preparation method thereof. Background technique [0002] Bubbles are a common phenomenon. Insoluble gases form bubbles, and foam occurs when many bubbles come together to form aggregates separated from each other by a thin film. Especially in the field of coatings and ink emulsions, dispersants, wetting agents, binders, thickeners, pigments and fillers are used in the production process. In the process of high-speed dispersion and blending, air enters the aqueous solution, which will generate a lot of foam. The existence of these foams will affect the construction of coatings or the use of inks, so defoamers must be added to coatings or ink products. [0003] Due to different foaming systems and production conditions, defoamers can be divided into mineral oils, pure silicone defoamers and emulsion defoame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/65C09D7/62C09D11/00C08G77/46
CPCC09D7/65C09D7/61C09D11/00C08G77/46
Inventor 潘朝群肖燕平
Owner SOUTH CHINA UNIV OF TECH
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