Mineral oil defoamer

A technology of mineral oil and defoamer, which is applied in the direction of foam dispersion/prevention, chemical instruments and methods, liquid degassing, etc. It can solve problems such as poor defoaming performance, coating defects, affecting coating appearance and quality, etc. Achieve the effect of improving anti-foaming performance and stability, and solving shrinkage cavity

Inactive Publication Date: 2020-04-07
湖北新四海化工股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the defoamers used in the water-based architectural coatings industry are mainly divided into two categories: silicone and mineral oil, but silicone products are not compatible with water-based systems, and are likely to cause problems such as coating shrinkage and edge shrinkage; and mineral oil The antifoaming agent is mainly composed of mineral oil, fatty acid metal soap, fatty acid amide, fatty alcohol and polyether, and has good dispersibility in water-based system; although the compatibility is better than that of silicone defoaming agent, but in terms of antifoaming performance have certain deficiencies
[0003] Patent CN200510088437.6 introduces a paint defoamer with three different structures of hydrocarbons as the carrier, fatty acid aluminum and silicon dioxide as the main defoaming substances, but it introduces some substituents with 2 to 6 carbon atoms When alkyl modified silicone oil, it is easy to cause coating defects; CN201010584403.7 introduces a processing method of a defoamer containing fatty acid aluminum and fatty acid amide; defoamer, but did not mention the poor stability and coating defects of the defoamer with silica as the defoamer component, nor did it mention the defoamer with silica and mineral oil as the main defoamer. Insufficient foam suppressing ability; CN101310814 introduces a defoaming system of mineral oil and silicone grease, which improves the defoaming suppressing ability, but it will cause serious shrinkage cavity and edge shrinkage when it is used in water-based paint
The document "Modification of Soybean Oil and Its Application in Defoamer" introduces that the compounding of mineral oil and soybean oil improves the stability of the defoamer system within a certain range, but fails to solve the problem of using alkyl silicone oil, hydrophobic A series of problems such as poor compatibility, poor stability, poor defoaming performance, and poor coating quality brought about by the defoaming system of silica as the active component
[0004] In addition, the past defoamers used mineral oil as the carrier, fatty acid metal soap as the main active substance, added polyether, modified polyether, silicone oil, modified silicone oil To increase its defoaming performance, but at the same time affect the appearance and quality of its coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, a kind of mineral oil defoamer, 21g alkyl silicone oil (the average carbon number is 1.3, and the carbon atom number in the group R is 10) and 2g precipitated silica are mixed, and at 2000rpm rotating speed Disperse at high speed for 10 minutes, raise the temperature to 100°C, and keep it warm for 0.5h to obtain mixture A, and the kinematic viscosity at 25°C reaches 3000mPa·s.

[0033]Then add 317g 5# white oil, 577g peanut oil and epoxidized peanut oil thereof in container, add 9g aluminum hexadecanoate while stirring, 13g aluminum dioctoate, 23g oxidized polyethylene wax, 25g stearic acid, and above-mentioned mixture A, then continue to stir for 15min. Immediately after slowly raising the temperature to 140°C and keeping it warm for 0.5h, then cooling down to 80°C, adding 18g of sorbitan trioleate (Span-85) and continuing to stir for 60min to obtain mixture B.

[0034] At room temperature, the mixture B was dispersed in a high-speed disperser at a speed...

Embodiment 2

[0035] Embodiment 2, a kind of mineral oil defoamer, 96g alkyl silicone oil (average carbon number is 2.1, and the number of carbon atoms in the group R is 14) is mixed with 45g precipitated silica, and rotates at 2000rpm Disperse at high speed for 10 minutes, raise the temperature to 160°C, and keep it warm for 2 hours to obtain mixture A, and the kinematic viscosity at 25°C reaches 4000mPa·s.

[0036] Then add 127g7# white oil, 673g soybean oil and its amidated soybean oil in container, add 30g bis(docosanoate) aluminum while stirring, 0.5g polyoxypropylene glycol, 0.5g n-stearyl alcohol, With the above mixture A, and then continue to stir for 10min. Immediately after slowly raising the temperature to 180°C and keeping it warm for 3h, then cooling down to 80°C, adding 28g of polyoxyethylene sorbitan trioleate (Tween-85) and continuing to stir for 60min to obtain mixture B.

[0037] At room temperature, the mixture B was dispersed in a high-speed disperser at a speed of 3000...

Embodiment 3

[0038] Embodiment 3, a kind of mineral oil defoamer, 11g alkyl silicone oil (average carbon number is 4.1, and the number of carbon atoms in the group R is 18) is mixed with 4g precipitated silica, and rotates at 2000rpm Disperse at high speed for 10 minutes, raise the temperature to 130°C, and keep it warm for 1.2h to obtain mixture A, and the kinematic viscosity at 25°C reaches 5000mPa·s.

[0039] Then add 170 alkylbenzenes, 630g castor oil and epoxidized castor oil thereof in the container, add 20g aluminum di(octadecanoate) while stirring, 15g isobutyl phosphate, 10g ethylene glycol diester stearate , and the above mixture A, and then continue to stir for 30min. Immediately after slowly raising the temperature to 140°C and keeping it warm for 3h, then cooling down to 60°C, adding 140g of oleic acid polyoxyethylene (6) ether, and continuing to stir for 60min to obtain mixture B.

[0040] At room temperature, the mixture B was dispersed in a high-speed disperser at a speed ...

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Abstract

The invention discloses a mineral oil defoamer. The defoamer comprises mineral oil, a carrier composed of vegetable oil and derivatives thereof, fatty acid metal soap, alkyl silicone oil, a defoamingaid, hydrophobic silica and an emulsifier. The vegetable oil and derivatives thereof and mineral oil are introduced into a system of alkyl silicone oil and silica, the average carbon atom number of the alkyl silicone oil is controlled to make the alkyl silicone oil well intermiscible with the mineral oil, and a ratio of the mineral oil to the vegetable oil and derivatives thereof is controlled between 1:6 and 4:7 to finally effectively solve the problems of cavity shrinkage, edge shrinkage and recession of a film and enhance the defoaming and foam-inhibiting properties and stability of the defoamer.

Description

technical field [0001] The invention relates to the field of defoamers. More specifically, it relates to a defoamer suitable for water-based architectural coatings. Background technique [0002] As a kind of fine chemicals, defoamers are widely used in various industries. The use of defoamers not only needs to meet their own stability and good antifoaming performance, but also has a good compatibility with the foaming system. Capacitance. At present, the defoamers used in the water-based architectural coatings industry are mainly divided into two categories: silicone and mineral oil, but silicone products are not compatible with water-based systems, and are likely to cause problems such as coating shrinkage and edge shrinkage; and mineral oil The antifoaming agent is mainly composed of mineral oil, fatty acid metal soap, fatty acid amide, fatty alcohol and polyether, and has good dispersibility in water-based system; although the compatibility is better than that of silico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409
Inventor 田坤杨伟王薛成耿学辉杨帆杨开柱
Owner 湖北新四海化工股份有限公司
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