CN110960893A - Mineral oil defoaming agent - Google Patents
Mineral oil defoaming agent Download PDFInfo
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- CN110960893A CN110960893A CN201911205286.6A CN201911205286A CN110960893A CN 110960893 A CN110960893 A CN 110960893A CN 201911205286 A CN201911205286 A CN 201911205286A CN 110960893 A CN110960893 A CN 110960893A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
Abstract
The invention discloses a mineral oil defoaming agent, which comprises the following components: the invention discloses a defoaming agent for a coating, which comprises mineral oil, a carrier consisting of vegetable oil and derivatives thereof, fatty acid metal soap, alkyl silicone oil, a defoaming auxiliary agent, hydrophobic silicon dioxide and an emulsifier, wherein the vegetable oil and the derivatives thereof and the mineral oil are introduced into a system of the alkyl silicone oil and the silicon dioxide, the vegetable oil and the derivatives thereof are well mutually dissolved by controlling the average carbon atom number of the alkyl silicone oil, and the ratio of the mineral oil to the vegetable oil and the derivatives thereof is controlled to be 1: 6-4: 7, so that the problems of shrinkage cavity, shrinkage and sinking of the coating are effectively solved, and the defoaming performance and stability of the defoaming agent are improved.
Description
Technical Field
The invention relates to the field of defoaming agents. More particularly, the invention relates to an antifoaming agent suitable for an aqueous architectural coating.
Background
The defoaming agent is widely applied to various industries as a fine chemical, and the use of the defoaming agent not only needs to meet the requirements of self stability and good defoaming and foam inhibition performance, but also needs to meet the requirement of good compatibility with a foaming system. The existing defoaming agent used in the water-based building coating industry is mainly divided into two categories of organic silicon and mineral oil, but the compatibility of an organic silicon product and a water-based system is poor, and the problems of shrinkage cavity, shrinkage edge and the like of a coating are easily caused; the mineral oil defoaming agent mainly comprises mineral oil, fatty acid metal soap, fatty acid amide, fatty alcohol and polyether, and has good dispersibility in an aqueous system; although the compatibility is better than that of the organic silicon defoaming agent, the defoaming agent has certain defects in defoaming and foam inhibiting performance.
Patent CN200510088437.6 describes a coating defoamer which takes three hydrocarbons with different structures as carriers and takes aluminum fatty acid and silicon dioxide as main defoaming substances, but when some alkyl modified silicone oil with 2-6 carbon atoms as substituent groups is introduced, coating defects are easily caused; CN201010584403.7 introduces a processing method of a defoaming agent containing fatty acid aluminum and fatty acid amide, CN 200910232532.7, CN201010550336.7 and CN201010549369 all introduce a defoaming agent containing silicon dioxide, but do not mention the problems of poor stability and coating defects of the defoaming agent taking silicon dioxide as a defoaming component, and do not mention the problem of insufficient defoaming and foam inhibition capacity of the defoaming agent mainly taking silicon dioxide and mineral oil; CN101310814 describes a defoaming system of mineral oil and silicone grease, which improves defoaming and foam inhibiting ability, but causes serious shrinkage cavity and edge shrinkage when used in water-based paint. The literature, "modification of soybean oil and application in defoaming agent" introduces that the stability of a defoaming agent system is improved by compounding mineral oil and soybean oil within a certain range, but a series of problems of poor compatibility, poor stability, poor defoaming and foam inhibiting performance, poor coating quality and the like caused by a defoaming system using alkyl silicone oil and hydrophobic silicon dioxide as active components cannot be solved.
In addition, the traditional defoaming agent takes mineral oil as a carrier, takes fatty acid metal soap as a main active substance, and adds polyether, modified polyether, silicone oil and modified silicone oil to improve the defoaming and foam inhibiting performance, but simultaneously influences the appearance and quality of the coating.
Disclosure of Invention
The invention aims to provide a mineral oil defoaming agent, which is characterized in that vegetable oil and derivatives thereof and mineral oil are introduced into a system of alkyl silicone oil and silicon dioxide, the alkyl silicone oil and the mineral oil are well mutually soluble by controlling the average carbon number of the alkyl silicone oil, and the ratio of the mineral oil to the vegetable oil and the derivatives thereof is controlled to be 1: 6-4: 7, so that the problems of shrinkage cavity, shrinkage edge and depression of a coating film are effectively solved, and the defoaming and foam inhibition performance and stability of the defoaming agent are improved.
A mineral oil defoamer comprises the following components: mineral oil, vegetable oil and a carrier consisting of derivatives of the vegetable oil, fatty acid metal soap, alkyl silicone oil, defoaming auxiliary agent, hydrophobic silicon dioxide and emulsifier.
Preferably, the mineral oil is a base oil extracted from petroleum by a physical distillation method, the processing flow is that in the process of extracting crude oil, useful light substances are fractionated, and residual tower bottom oil is further extracted, and the mineral oil mostly consists of alkane, aromatic hydrocarbon, cyclane and part of olefin. The mineral oil is selected from mineral oil with the kinematic viscosity of 1-40 mm2/s at 40 ℃, and considering the miscibility with alkyl silicone oil and the defoaming performance, the mineral oil with the kinematic viscosity of 2-10 mm2/s at 40 ℃ is preferably selected from white oil, liquid wax and alkylbenzene.
The vegetable oil and its derivatives are lipid-structured substances selected from castor oil, soybean oil, palm oil, rapeseed oil, linseed oil and their derivatives, wherein the derivatives of the vegetable oil include epoxidized compounds of the vegetable oil, amidated compounds of the vegetable oil, and wherein the derivatives of the vegetable oil can be used alone or in combination.
The ratio of the mineral oil to the vegetable oil and the derivatives thereof is controlled to be 1: 6-4: 7, and the using amount of the carrier is 80-95% of the total mass of the defoaming agent.
Preferably, the fatty acid metal soap comprises one or more of magnesium salt, aluminum salt, calcium salt and zinc salt of fatty acid. The fatty acid aluminum is preferably one or two of mono-fatty acid aluminum and di-fatty acid aluminum which are mixed according to any proportion.
The monofatty acid aluminum includes aluminum butyrate, aluminum caprylate, aluminum myristate, aluminum pentadecanoate, aluminum palmitate, aluminum heptadecanoate, aluminum stearate, aluminum nonadecanoate, aluminum eicosanoate, aluminum docosanoate, aluminum triacontanoate, aluminum tetradecenoate, aluminum docosenoate, and aluminum linolenate. Aluminum octoate, aluminum hexadecanoate, aluminum octadecanoate and aluminum docosanoate are preferred.
Aluminum bis-fatty acid includes aluminum dibutyrate, aluminum dioctoate, aluminum ditetradecanoate, aluminum dipentadecanoate, aluminum dihexadecanoate, aluminum diheheptadecanoate, aluminum dioctadecanoate, aluminum di nonadecanoate, aluminum di eicosanoate, aluminum docosanoate, aluminum triacontanoate, aluminum di hexadecanoate, aluminum dioctadecanoate and aluminum linoleate. Aluminum dioctoate, aluminum dihexadecanoate, aluminum dioctadecanoate and aluminum didodecanoate are preferable.
The number of carbon atoms of the fatty acid of the aluminum monofatty acid and the aluminum difatty is 4 to 30, preferably 8 to 24, and particularly preferably 14 to 22, and when the number of carbon atoms is in this range, the defoaming performance can be further improved. The using amount of the defoaming agent is 2-8% of the total amount of the defoaming agent.
Preferably, the alkyl silicone oil is of the structure:
wherein the group R is selected from alkyl groups of 4 to 40 carbon atoms, preferably of 10 to 30 carbon atoms; the subscript m is an integer of 10-100, n is an integer of 20-300, and the kinematic viscosity of the alkyl silicone oil at 25 ℃ is 100-3000 mPa & s; the average number of carbon atoms of the alkyl silicone oil is required to be 1.2-12.8, and the alkyl silicone oil can be mixed with mineral oil and has good defoaming and foam inhibiting performance. The content of the alkyl silicone oil is 0.5-10% of the total amount of the defoaming agent.
Preferably, the defoaming auxiliary agent mainly comprises fatty alcohol, fatty acid ester, fatty wax, modified fatty wax and phosphate compound, and the substances are used singly or in a mixture to better improve defoaming and foam inhibiting performance.
The fatty acid may be any of a fatty acid and a cyclic fatty acid, preferably a fatty acid, including a fatty acid having 2 to 30 carbon atoms, preferably a fatty acid having 12 to 22 carbon atoms.
The fatty alcohol is selected from fatty alcohol containing 2-30 carbon atoms, including monohydric or polyhydric alcohol, preferably fatty alcohol containing 12-22 carbon atoms.
The fatty acid ester is a fatty acid ester formed by reacting a mono-or polyhydric fatty alcohol with a long-chain fatty acid.
The fatty wax includes animal wax, spermaceti wax, beeswax, chinese wax, vegetable wax, candelilla wax, carnauba wax, japan wax, mineral ceresin wax, ozokerite, montan wax, paraffin wax, petroleum wax, paraffin wax, microcrystalline wax, synthetic wax, fischer-tropsch wax, polyethylene wax, polypropylene wax, chlorinated paraffin wax, emulsified wax and modifications thereof, preferably paraffin wax, polyethylene wax and polypropylene wax and derivatives thereof.
The total dosage of the defoaming auxiliary agent is 0.1-5% of the total amount of the defoaming agent.
Preferably, the silica is classified into precipitated silica and vapor phase silica according to the production method, and hydrophilic silica and hydrophobic silica according to the surface activity. The specific surface area of the silicon dioxide selected by the invention is 20-500 m2/g, preferably 50-200 m2/g, and the dosage of the silicon dioxide is 0.1-5% of the total amount of the defoaming agent.
Preferably, the emulsifier comprises anionic and nonionic surfactants, either alone or in combination. Used alone, preferably nonionic surfactants mainly comprising fatty alcohol polyoxyethylene ether, oleic acid polyoxyethylene ether, castor oil polyoxyethylene ether, polyoxyethylene fatty amine compound, polyoxyethylene sorbitan monolaurate (Tween-20), polyoxyethylene sorbitan monopalmitate (Tween-40), polyoxyethylene sorbitan monostearate (Tween-60), polyoxyethylene sorbitan monooleate (Tween-80), polyoxyethylene sorbitan trioleate (Tween-85), sorbitan monolaurate Span-20), sorbitan monopalmitate (Span-40), sorbitan monostearate (Span-60), sorbitan monooleate (Span-80), sorbitan trioleate (Span-85), preferably, the hydrophilic-lipophilic balance (HLB) value is 8-10. The dosage of the emulsifier is 1-15% of that of the defoaming agent.
Preferably, the preparation steps include:
firstly, dispersing alkyl silicone oil and silicon dioxide in a high-speed dispersion machine at a rotating speed of 2000rpm for 10min, heating to 100-160 ℃, and preserving heat for 0.5-2 h to obtain a mixture A, wherein the kinematic viscosity at 25 ℃ reaches 3000-8000 mPa.
Adding mineral oil, vegetable oil and derivatives thereof into a container, adding fatty acid metal soap, a defoaming auxiliary agent and the mixture A under continuous stirring, stirring for at least 10-30 min to disperse the system uniformly, then slowly heating to 140-180 ℃, and preserving heat for 0.5-3 h; then, the temperature is reduced to 40-80 ℃, the emulsifier is added, and the mixture is continuously stirred for 60min, so that a mixture B is obtained.
And (3) dispersing the mixture B at the rotating speed of 3000rpm of a high-speed dispersion machine at room temperature until the particle size range of the particles is 5-20 um, thus obtaining the defoaming agent.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, vegetable oil and derivatives thereof and mineral oil are introduced into a system of alkyl silicone oil and silicon dioxide, the alkyl silicone oil and the mineral oil are well mutually soluble by controlling the average carbon number of the alkyl silicone oil, and the ratio of the mineral oil to the vegetable oil and the derivatives thereof is controlled to be 1: 6-4: 7, so that the problems of shrinkage cavity, shrinkage edge and depression of a coating film are effectively solved, and the defoaming and foam inhibiting performance and stability of the defoaming agent are improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1 a mineral oil defoamer, 21g of an alkyl silicone oil (average carbon number 1.3, and 10 carbon atoms in the group R) and 2g of precipitated silica were mixed and dispersed at high speed at 2000rpm for 10min, and heated to 100 ℃ and held at temperature for 0.5h to give a mixture a having a kinematic viscosity of 3000mPa · s at 25 ℃.
317g of white 5# oil, 577g of peanut oil and epoxidized peanut oil thereof are then added to the vessel, while stirring, 9g of aluminum hexadecanoate, 13g of aluminum dioctoate, 23g of oxidized polyethylene wax, 25g of stearic acid and the mixture A mentioned above are added, and stirring is continued for 15 min. And slowly heating to 140 ℃, preserving the heat for 0.5h, then cooling to 80 ℃, adding 18g of sorbitan trioleate (Span-85), and continuously stirring for 60min to obtain a mixture B.
And dispersing the mixture B in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size range of the particles is 5-20 mu m at room temperature to obtain the defoaming agent I.
Example 2 a mineral oil defoamer, 96g of an alkyl silicone oil (average carbon number 2.1, and 14 carbon atoms in the group R) and 45g of precipitated silica were mixed and dispersed at high speed at 2000rpm for 10min, and heated to 160 ℃ and held for 2h to give a mixture a having a kinematic viscosity of 4000mPa · s at 25 ℃.
127g of 7# white oil, 673g of soybean oil and amidated soybean oil were then added to the vessel, 30g of aluminum behenate, 0.5g of polyoxypropylene glycol, 0.5g of n-octadecanol were added with stirring to the mixture A, and stirring was continued for 10 min. And slowly heating to 180 ℃, preserving the heat for 3 hours, then cooling to 80 ℃, adding 28g of polyoxyethylene sorbitan trioleate (Tween-85), and continuously stirring for 60 minutes to obtain a mixture B.
And dispersing the mixture B in a high-speed disperser at 3000rpm until the particle size of the particles is 5-20 μm at room temperature to obtain the defoaming agent II.
Example 3 a mineral oil defoamer, 11g of an alkyl silicone oil (average carbon number 4.1, and 18 carbon atoms in the group R) was mixed with 4g of precipitated silica and dispersed at high speed at 2000rpm for 10min, and heated to 130 ℃ and held at temperature for 1.2h to give a mixture a having a kinematic viscosity of 5000mPa · s at 25 ℃.
Then, 170 g of alkylbenzene, 630g of castor oil and epoxidized castor oil thereof were added to the vessel, 20g of aluminum dioctadecylate, 15g of isobutyl phosphate, 10g of ethylene glycol distearate and the above mixture A were added with stirring, and then stirring was continued for 30 minutes. And then slowly heating to 140 ℃, preserving the heat for 3 hours, then cooling to 60 ℃, adding 140g of polyoxyethylene (6) oleate, and continuously stirring for 60min to obtain a mixture B.
And dispersing the mixture B in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size of the particles is 5-20 mu m at room temperature to obtain the defoaming agent III.
Example 4 a mineral oil defoamer, 20g of an alkyl silicone oil (average carbon number 5.2, and number of carbon atoms in the group R22) was mixed with 6g of precipitated silica and dispersed at high speed for 10min at 2000rpm, and heated to 100 ℃ and held for 1h to give a mixture a with a kinematic viscosity of 6500mPa · s at 25 ℃.
216g of No. 300 liquid wax, 584g of palm oil and epoxidized palm oil thereof were then added to the vessel, and 80g of aluminum octoate and 14g of polyoxybutylene glycol were added to the mixture A while stirring, followed by further stirring for 20 minutes. And slowly heating to 160 ℃, preserving the heat for 0.5h, then cooling to 80 ℃, adding 80g of polyoxyethylene ether, and continuously stirring for 60min to obtain a mixture B.
And dispersing the mixture B in a high-speed disperser at 3000rpm until the particle size of the particles is 5-20 μm at room temperature to obtain the defoaming agent IV.
Example 5 a mineral oil defoamer, 10g of an alkyl silicone oil (average carbon number 8.1, and 26 carbon atoms in the group R) was mixed with 1g of precipitated silica and dispersed at high speed for 10min at 2000rpm, and heated to 100 ℃ and held for 1h to give a mixture a having a kinematic viscosity of 7000mPa · s at 25 ℃.
302g of alkylbenzene, 628g of linseed oil and epoxidized linseed oil thereof were then added to the vessel, 48g of aluminum dioctoate, 0.5g of polyoxybutylene glycol and 0.5g of stearic acid were added with stirring, and the mixture A was stirred for a further 20 minutes. And slowly heating to 150 ℃, preserving the heat for 0.5h, then cooling to 70 ℃, adding 10g of fatty alcohol-polyoxyethylene ether, and continuously stirring for 60min to obtain a mixture B.
And dispersing the mixture B in a high-speed disperser at 3000rpm until the particle size of the particles is 5-20 μm at room temperature to obtain the defoaming agent V.
Example 6 a mineral oil defoamer, 50g of an alkyl silicone oil (average carbon number 12.1, and number of carbon atoms in group R30) was mixed with 12g of precipitated silica and dispersed at high speed for 10min at 2000rpm, and heated to 100 ℃ and held for 0.5h to give mixture a with a kinematic viscosity at 25 ℃ of 8000mPa · s.
273g of alkylbenzene, 527g of rapeseed oil and its amidated rapeseed oil were then added to the vessel, 60g of aluminum dicetylate, 3g of fatty wax were added with stirring, and the mixture A was stirred for a further 20 min. And slowly heating to 140 ℃, preserving the heat for 3 hours, then cooling to 50 ℃, adding 75g of polyoxyethylene sorbitan monostearate (Tween-60), and continuously stirring for 60min to obtain a mixture B.
And dispersing the mixture B in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size of the particles is 5-20 mu m at room temperature to obtain the defoaming agent VI.
Comparative example 1
32g of dimethylsilicone oil (average carbon number 1, number of carbon atoms in the radical R1) were mixed with 2g of precipitated silica and dispersed at high speed for 10min at 2000rpm to give a mixture X having a kinematic viscosity of 1000 mPas at 25 ℃.
Then 268g of liquid wax, 625g of peanut oil and its epoxidized peanut oil are added to the vessel, 12g of aluminum stearate, 15g of aluminum distearate, 4g of oxidized polyethylene wax, 2g of stearic acid are added with stirring, and the mixture X is stirred for a further 10 minutes. And slowly heating to 140 ℃, preserving the heat for 0.5h, then cooling to 80 ℃, adding 45g of sorbitan trioleate (Span-85), and continuously stirring for 60min to obtain a mixture Y.
And dispersing the mixture Y in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size range of the particles is 5-20 mu m at room temperature to obtain the defoaming agent C-I.
Comparative example 2
Mixing 25g of alkyl silicone oil (the average carbon number is 11.8, and the carbon number in the group R is 30) and 3g of precipitation method silicon dioxide, dispersing at high speed for 10min at 2000rpm, heating to 160 ℃, and preserving heat for 2h to obtain a mixture X, wherein the dynamic viscosity reaches 10000mPa & s at 25 ℃.
Then 300g of 7# white oil, 590g of soybean oil and amidated soybean oil were added to the vessel, 25g of aluminum behenate, 11g of polyoxypropylene glycol were added with stirring, and the mixture X was stirred for 10 min. And slowly heating to 180 ℃, preserving the heat for 3 hours, then cooling to 80 ℃, adding 51g of polyoxyethylene sorbitan trioleate (Tween-85), and continuously stirring for 60min to obtain a mixture Y.
And dispersing the mixture Y in a high-speed dispersion machine at the rotating speed of 3000rpm at room temperature until the particle size range of the particles is 5-20 mu m to obtain the defoaming agent C-II.
Comparative example 3
20g of alkyl silicone oil (average carbon number 13.0, and carbon number 28 in the group R) and 2g of precipitation-process silica were mixed, and dispersed at high speed at 2000rpm for 10min, and heated to 130 ℃ and kept at the temperature for 1.2h to obtain a mixture X, and the dynamic viscosity at 25 ℃ reached 7000 mPas.
200g of alkylbenzene, 706g of castor oil and epoxidized castor oil thereof are then added to the vessel, 30g of aluminum dioctadecylate, 12g of isobutyl phosphate and 7g of ethylene glycol distearate are added with stirring, and the mixture X is stirred for a further 30 minutes. And slowly heating to 140 ℃, preserving the heat for 3 hours, then cooling to 60 ℃, adding 28g of polyoxyethylene (6) oleate, and continuously stirring for 60min to obtain a mixture Y.
And dispersing the mixture Y in a high-speed dispersion machine at the rotating speed of 3000rpm at room temperature until the particle size of the particles is 5-20 mu m to obtain the defoaming agent C-III.
Comparative example 4
44g of alkyl silicone oil (average carbon number 6.2, and carbon number 18 in the group R) and 3g of precipitation-process silica were mixed and dispersed at a high speed of 2000rpm for 10min, and the mixture was heated to 100 ℃ and kept warm for 1h to obtain a mixture X having a dynamic viscosity of 9500 mPas at 25 ℃.
263g of No. 300 liquid wax, 600g of palm oil and epoxidized palm oil thereof are then added to the vessel, 36g of aluminum octoate and 10g of polyoxybutylene glycol are added with stirring, and the mixture X is stirred for a further 20 min. And slowly heating to 160 ℃, preserving the heat for 0.5h, then cooling to 80 ℃, adding 50g of polyoxyethylene ether, and continuously stirring for 60min to obtain a mixture Y.
And dispersing the mixture Y in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size of the particles is 5-20 mu m at room temperature to obtain the defoaming agent C-IV.
Comparative example 5
25g of alkyl silicone oil (average carbon number 1.7, and carbon number 42 in the group R) and 6g of precipitated silica were mixed and dispersed at a high speed of 2000rpm for 10min, and the mixture was heated to 100 ℃ and kept at the temperature for 0.5h to obtain a mixture X having a kinematic viscosity of 8000 mPas at 25 ℃.
Then 300g of 5# white oil, 580g of soybean oil and its amidated soybean oil were added to the vessel, 40g of aluminum di (hexadecanoate), 9g of fatty wax and the above mixture X under stirring, and then stirring was continued for 20 min. And slowly heating to 140 ℃, preserving the heat for 3 hours, then cooling to 50 ℃, adding 40g of polyoxyethylene sorbitan monostearate (Tween-60), and continuously stirring for 60min to obtain a mixture Y.
And at room temperature, dispersing the mixture Y in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size of the particles is 5-20 mu m to obtain the defoaming agent C-VI.
Comparative example 6
24g of alkyl silicone oil (the average carbon number is 5.2, and the carbon number in the group R is 14) and 4g of precipitation method silicon dioxide are mixed, and are dispersed at a high speed for 10min at the rotating speed of 2000rpm, the temperature is raised to 160 ℃, the temperature is kept for 2h, and a mixture X is obtained, and the kinematic viscosity reaches 6000mPa & s at the temperature of 25 ℃.
80g of 7# white oil, 810g of soybean oil and amidated soybean oil were then added to the vessel, 25g of aluminum behenate, 8g of polyoxypropylene glycol, 4g of n-octadecanol were added with stirring, and the mixture X was stirred for 10 min. And slowly heating to 180 ℃, preserving the heat for 3 hours, then cooling to 80 ℃, adding 50g of polyoxyethylene sorbitan trioleate (Tween-85), and continuously stirring for 60 minutes to obtain a mixture Y.
And at room temperature, dispersing the mixture B in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size range of the particles is 5-20 um to obtain the defoaming agent C-VII.
Comparative example 7
44g of alkyl silicone oil (the average carbon number is 3.8, and the carbon number in the group R is 16) and 3g of precipitation method silicon dioxide are mixed and dispersed at a high speed for 10min at the rotating speed of 2000rpm, the temperature is raised to 100 ℃, the temperature is kept for 1h to obtain a mixture X, and the dynamic viscosity reaches 4000mPa & s at 25 ℃.
763g of No. 300 liquid wax, 100g of palm oil and epoxidized palm oil thereof were then added to the vessel, 36g of aluminum octoate and 10g of polyoxybutylene glycol were added with stirring, and the mixture X was stirred for 20 min. And slowly heating to 160 ℃, keeping the temperature for 0.5h, then cooling to 80 ℃, adding 50g of castor oil polyoxyethylene ether, and continuously stirring for 60min to obtain a mixture Y.
And at room temperature, dispersing the mixture B in a high-speed dispersion machine at the rotating speed of 3000rpm until the particle size of the particles is within 5-20 um to obtain the defoaming agent C-VIII.
Performance testing of the antifoam
(1) Defoaming and foam suppressing performance test
The test method comprises the following steps: adding 135g of prepared paint into a 1000ml stainless steel cup, then adding 15g of styrene-acrylic emulsion, stirring for 1min at a stirring speed of 600rpm under a high-speed dispersion machine to uniformly mix the paint and the styrene-acrylic emulsion, then adding 1% of thickening agent, 0.2% of 2-amino-2-methyl-1-propanol, continuously stirring for 1min at 600rpm, finally adding 0.3% of defoaming agent, stirring for 6min at a stirring speed of 600rpm, recording apparent bubbles after stopping stirring, immediately pouring the mixture into a 100ml measuring cylinder, recording volume V, calculating specific gravity, and indicating that the defoaming agent has good defoaming performance when the numerical value is large. The test results were as follows:
TABLE 1 comparison of foam suppressing Properties of defoamers
| Defoaming agent | Specific gravity g/ml |
| I | 1.4365 |
| II | 1.4352 |
| III | 1.4377 |
| IV | 1.4361 |
| V | 1.4329 |
| VI | 1.4367 |
| C-I | 1.4127 |
| C-II | 1.4153 |
| C-III | 1.4155 |
| C-IV | 1.4210 |
| C-V | 1.4165 |
| C-VI | 1.4201 |
| C-VII | 1.4256 |
Through the above experiments, it can be seen that the defoaming agent of the present invention has excellent foam suppressing performance.
Paint test
The test method comprises the following steps: standing the high-speed dispersed paint for 10min, taking out a little, standing on a glass plate, uniformly scraping the paint with a 75um wet film preparation device, observing the state of a coating film, and expressing the state with grades as shown in Table 2;
TABLE 2 coating rating classes
TABLE 3 comparison of coating effectiveness of defoamers
| Defoaming agent | I | II | III | IV | V | VI | C-I | C-II | C-III | C-IV | C-V | C-VI | C-VII |
| Coating grade | A5 | A5 | A5 | A5 | A5 | A5 | C2 | C3 | C3 | C3 | C3 | C3 | C3 |
Through the experiment, the coating of the defoaming agent which does not meet at least one of the three conditions that the number of carbon atoms of the group R in the alkyl silicone oil is between 4 and 40, the average number of carbon atoms is between 1.2 and 12.8, and the ratio of the mineral oil to the vegetable oil is between 1:6 and 4:7 is far different from that of the defoaming agent.
Stability test
The test method comprises the following steps:
placing the defoaming agent into a centrifugal tube with scales, centrifuging at 3000rpm for 15min at a high speed, and after centrifuging is finished, the larger the volume of the upper-layer oily liquid in the centrifugal tube is, the poorer the stability of the defoaming agent is;
placing the defoaming agent in a 40 ℃ oven for 30 days, and visually observing whether the defoaming agent is layered or not, wherein the test results are as follows
Table 4 antifoam stability test-centrifugal stability
Table 5 antifoam stability test-stability on standing
From the above experiments, it was seen that the defoaming agent of the present invention has excellent stability.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The mineral oil defoaming agent is characterized by comprising the following components: mineral oil, vegetable oil and a carrier consisting of derivatives of the vegetable oil, fatty acid metal soap, alkyl silicone oil, defoaming auxiliary agent, hydrophobic silicon dioxide and emulsifier.
2. The mineral oil defoaming agent is characterized in that the mineral oil is selected from mineral oil with the kinematic viscosity of 1-40 mm2/s at 40 ℃, and comprises white oil, liquid wax and alkylbenzene; the vegetable oil and its derivatives include castor oil, soybean oil, palm oil, rapeseed oil, linseed oil and their derivatives, wherein the derivatives of the vegetable oil include epoxidized compounds of the vegetable oil, amidated compounds of the vegetable oil, wherein the derivatives of the vegetable oil can be used alone or in combination; the ratio of the mineral oil to the vegetable oil and the derivatives thereof is controlled to be 1: 6-4: 7, and the using amount of the carrier is 80-95% of the total mass of the defoaming agent.
3. A mineral oil defoamer as set forth in claim 1, wherein; the fatty acid metal soap comprises one or more of magnesium salt, aluminum salt, calcium salt and zinc salt of fatty acid.
4. A mineral oil defoamer as set forth in claim 1, wherein; the alkyl silicone oil has the following structure:
wherein the group R is selected from alkyl groups of 4 to 40 carbon atoms; the subscript m is an integer of 10-100, n is an integer of 20-300, wherein the kinematic viscosity of the alkyl silicone oil at 25 ℃ is 100-3000 mPa & s, the average number of carbon atoms is 1.2-12.8, and the content of the alkyl silicone oil is 0.5-10% of the total amount of the defoaming agent.
5. The mineral oil defoamer of claim 1, wherein the defoaming aid comprises fatty alcohol, fatty acid ester, fatty wax, modified fatty wax, and phosphate ester compound.
6. The mineral oil defoamer as set forth in any one of claims 1-5, wherein the step of preparing comprises:
step (1): dispersing alkyl silicone oil and silicon dioxide in a high-speed dispersion machine at a rotating speed of 2000rpm for 10min at a high speed, heating to 100-160 ℃, and preserving heat for 0.5-2 h to obtain a mixture A, wherein the kinematic viscosity reaches 3000-8000 mPa & s at 25 ℃;
step (2): adding mineral oil, vegetable oil and derivatives thereof into a container, adding fatty acid metal soap, a defoaming auxiliary agent and the mixture A under continuous stirring, stirring for 10-30 min to uniformly disperse the system, slowly heating to 140-180 ℃, and keeping the temperature for 0.5-3 h; then, beginning to cool to 40-80 ℃, adding an emulsifier, and continuously stirring for 60min to obtain a mixture B;
and (3): and (3) dispersing the mixture B at the rotating speed of 3000rpm of a high-speed dispersion machine at room temperature until the particle size range of the particles is 5-20 um, thus obtaining the mineral oil defoaming agent.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112057907A (en) * | 2020-08-27 | 2020-12-11 | 江苏赛欧信越消泡剂有限公司 | Water-oil universal mineral oil defoaming agent and preparation method thereof |
| CN114949938A (en) * | 2022-03-04 | 2022-08-30 | 合肥新万成环保科技有限公司 | Water-based mineral oil defoaming agent and preparation method thereof |
| CN115216215A (en) * | 2022-07-09 | 2022-10-21 | 江苏长诺运动场地新材料有限公司 | Environment-friendly polyurethane surface layer for court and preparation method thereof |
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| CA2393625C (en) * | 1999-12-10 | 2010-11-30 | Mbt Holding Ag | Solubilized defoamers for cementitious compositions |
| CN101991975A (en) * | 2010-12-13 | 2011-03-30 | 南京四新科技应用研究所有限公司 | Mineral oil defoaming agent and preparation method thereof |
| CN104479439A (en) * | 2014-12-08 | 2015-04-01 | 南京四新科技应用研究所有限公司 | Mineral oil defoaming agent |
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| CA2393625C (en) * | 1999-12-10 | 2010-11-30 | Mbt Holding Ag | Solubilized defoamers for cementitious compositions |
| CN101991975A (en) * | 2010-12-13 | 2011-03-30 | 南京四新科技应用研究所有限公司 | Mineral oil defoaming agent and preparation method thereof |
| CN104479439A (en) * | 2014-12-08 | 2015-04-01 | 南京四新科技应用研究所有限公司 | Mineral oil defoaming agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112057907A (en) * | 2020-08-27 | 2020-12-11 | 江苏赛欧信越消泡剂有限公司 | Water-oil universal mineral oil defoaming agent and preparation method thereof |
| CN114949938A (en) * | 2022-03-04 | 2022-08-30 | 合肥新万成环保科技有限公司 | Water-based mineral oil defoaming agent and preparation method thereof |
| CN115216215A (en) * | 2022-07-09 | 2022-10-21 | 江苏长诺运动场地新材料有限公司 | Environment-friendly polyurethane surface layer for court and preparation method thereof |
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