Mineral oil defoaming agent and preparation method thereof

Abstract

According to the mineral oil defoaming agent and the preparation method thereof provided by the invention, the aliphatic isocyanate and the amine substance react to prepare the hydrophobic particles, and the special hydrophobic particles are introduced in the preparation process of the mineral oil defoaming agent, so that compared with other hydrophobic particles, the hydrophobic particles are more easily and quickly dispersed in an organic carrier medium, and the hydrophobic particles are more uniform in dispersion. The hydrophobic particles finally exist in a dispersion medium in a sol form, the defoaming efficiency is high, the introduced aliphatic isocyanate is more compatible with mineral oil, and the hydrophobic particles are not easy to aggregate and attenuate; meanwhile, the defoaming agent can be better compatible with a coating and has good compatibility, and the problems that an existing mineral oil defoaming agent is poor in stability and poor in compatibility are solved.

Description

Technical Field

[0001] The invention relates to the field of defoamers, and in particular to a mineral oil defoamer and a preparation method thereof. Background Art

[0002] Defoamers are widely used to control harmful foams generated in industrial processes. In the past, defoamers for controlling foaming included mineral oils, alcohols, fatty acids and fatty acid esters, amides, phosphates, silicones, polyethers, polyether-modified polysiloxanes, and mixtures thereof. More and more defoamers have been introduced to solve foam problems in different production fields, such as papermaking, coatings, wastewater treatment and other systems.

[0003] In domestic and foreign literature, there are many defoamers based on carrier oils. This type of defoamer uses oil as a carrier, and the defoaming active component is a hydrophobic substance including high-carbon alcohols, white carbon black, urea, fatty acid metal soaps. In addition, an emulsifier is generally required to make the active component evenly dispersed. CN 200910232532.7, CN201010550336.7, and CN201010549369.X all introduce defoamers containing silicon dioxide, but none of them mention the poor stability and coating defects of defoamers with silicon dioxide as the defoaming component, nor the problem of insufficient defoaming and defoaming ability of defoamers based on silicon dioxide and mineral oil; CN101310814 introduces a defoaming system of mineral oil and silicone grease, which improves the defoaming and defoaming ability, but it will cause serious shrinkage and shrinkage problems when used in water-based coatings; CN201010584403.7 This paper introduces the processing method of defoamers containing fatty acid aluminum and fatty acid amide at the same time. However, this type of defoamer may cause the system viscosity to be too high and solidify in the later stage, resulting in instability of the final product. It can be seen that the addition of hydrophobic substances to mineral oil can greatly enhance the defoaming ability of the mixture, but if the proportion is not properly controlled and there are too many hydrophobic particles, the system concentration and viscosity may be too high, or even solidify, which will bring inconvenience to use and may also cause the product compatibility to deteriorate and reduce the application performance. Summary of the invention

[0004] The invention provides a mineral oil defoamer. Hydrophobic particles are prepared by reacting aliphatic isocyanate and amine substances. Special hydrophobic particles are introduced in the preparation process of the mineral oil defoamer. Compared with other hydrophobic particles, the hydrophobic particles are more easily and quickly dispersed in an organic carrier medium, and finally exist in the dispersion medium in the form of sol. The defoaming efficiency is high. The introduction of aliphatic isocyanate is more compatible with mineral oil, and the hydrophobic particles are not easy to aggregate and decay. At the same time, the defoamer can be better compatible with coatings and has good compatibility, thereby solving the problems of poor stability and poor compatibility of the current mineral oil defoamer.

[0005] The mineral oil defoamer of the present invention is composed of the following components: A. Carrier oil The carrier oil is a liquid organic hydrocarbon selected from white oil, kerosene, diesel, machine oil, liquid wax, alkylbenzene, naphthenic oil, heavy alkylbenzene, used alone or in combination, preferably white oil; the amount of the carrier oil accounts for 80-90% of the total mass of the mineral oil defoamer; B. Aliphatic isocyanate The structural formula of the aliphatic isocyanate is: (M1)-R-(M2); wherein the groups M1 and M2 are the same or different and are selected from the group -N=C=O-, the group H, and at least one of the groups M1 and M2 is -N=C=O-; R is an alkyl group with a carbon number of 6-18; the amount used accounts for 2-5% of the total mass of the mineral oil defoamer C. Amine substances The amine substance is selected from one or more combinations of 1,3-propylenediamine, diethylenetriamine, tri(2-aminoethyl)amine, 1,6-hexanediamine, octadecane-9-ene-1-amine, and polyethyleneimine, and the amount used accounts for 0.5-1.5% of the total mass of the mineral oil defoamer.

[0006] D. Emulsifier The emulsifier is a nonionic surfactant, selected from one or more combinations of 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), and nonylphenol polyoxyethylene ether. The amount of the emulsifier accounts for 5-15% of the total mass of the mineral oil defoamer.

[0007] A preparation method of a mineral oil defoamer is as follows: (1) Add the carrier oil and amine substance into the reaction container, stir and mix evenly at 25℃~50℃ until the amine substance is completely dissolved; (2) Keep the temperature constant and continue stirring, add aliphatic isocyanate, react for 0.5-2h, add emulsifier, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. DETAILED DESCRIPTION Example 1

[0009] (1) Add 80g of 5# white oil and 1.5g of 1,3-propylenediamine into a reaction vessel and stir and mix evenly at 25°C until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 5 g of octadecyl isocyanate, react for 2 hours, add 13.5 g of a mixture of fatty alcohol polyoxyethylene ether and oleic acid polyoxyethylene ether, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. Example 2

[0010] (1) Add 85g of 15# white oil and 0.5g of diethylenetriamine into a reaction vessel and stir and mix evenly at 30°C until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 2g of 1,6-hexamethylene diisocyanate, react for 2h, add 12.5g of a mixture of castor oil polyoxyethylene ether and polyoxyethylene fatty amine compounds, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. Example 3

[0011] (1) Add 90 g of kerosene and diesel mixture and 1 g of tris(2-aminoethyl)amine into a reaction vessel and stir and mix evenly at 40°C until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 3 g of tridecyl isocyanate, react for 1 hour, add 6 g of Tween-20 and Span-40 mixture, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. Example 4

[0012] (1) Add 90 g of a mixture of machine oil and liquid wax and 1 g of 1,6-hexanediamine into a reaction vessel and stir to mix evenly at 50°C until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 4g of a mixture of 1,6-hexamethylene diisocyanate and tridecyl isocyanate, react for 1.5h, add 5g of a mixture of Tween-60 and Span-80, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. Example 5

[0013] (1) Add 81.5 g of a mixture of alkylbenzene and cyclohexane oil and 0.5 g of octadecane-9-en-1-amine into a reaction vessel and stir and mix them evenly at 35° C. until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 3g of a mixture of octadecyl isocyanate and tridecyl isocyanate, react for 2h, add 15g of a mixture of Tween-80 and Span-85, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. Example 6

[0014] (1) Add 87 g of heavy alkylbenzene and 1 g of polyethyleneimine into a reaction vessel and stir and mix evenly at 45°C until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 2 g of tridecyl isocyanate, react for 1 hour, add 10 g of fatty alcohol polyoxyethylene ether and pass through a homogenizer, and finally cool to obtain the mineral oil defoamer. Example 7

[0015] (1) Add 88 g of diesel and 1 g of 1,3-propylenediaminediethylenetriamine into a reaction vessel and stir to mix evenly at 40°C until all the amine substances are dissolved; (2) Keep the temperature constant and continue stirring, add 3g of 1,6-hexamethylene diisocyanate, react for 0.5h, add 8g of polyoxyethylene fatty amine compound, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer.

[0016] Comparative Example 1 (1) 80 g of 5# white oil and 6.5 g of octadecyl isocyanate were mixed, stirred and mixed evenly at 25° C., 13.5 g of a mixture of fatty alcohol polyoxyethylene ether and oleic acid polyoxyethylene ether was added, passed through a homogenizer, and finally cooled to obtain the mineral oil defoamer.

[0017] Comparative Example 2 (1) Add 85 g of 15# white oil and 2.5 g of diethylenetriamine into a reaction container, stir and mix evenly at 30°C until all the amine substances are dissolved; keep the temperature constant and continue stirring, add 12.5 g of a mixture of castor oil polyoxyethylene ether and polyoxyethylene fatty amine compounds, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer.

[0018] Comparative Example 3 (1) Add 90 g of a mixture of kerosene and diesel and 1 g of hydrophobic silica into a reaction vessel and stir to mix evenly at 40 °C; (2) Keeping the temperature constant and continuing stirring, add 3 g of hydrophobic silica, stir for 1 hour, add 6 g of Tween-20 and Span-40 mixture, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer.

[0019] Comparative Example 4 Prepared according to Example 1 of CN102070940A Comparative Example 5 Prepared according to Example 1 of CN101991975A Performance Test: (1) Anti-foaming performance test Test method: Add 200g of self-prepared water-based paint into a 1000ml stainless steel cup, then add 0.3% defoamer, use a laboratory high-speed disperser to disperse at a speed of 1000rpm for 10 minutes, pour into a 1000ml measuring cylinder immediately after stopping, record the weight and volume of the liquid, calculate the specific gravity, and a large specific gravity value indicates a small air content, indicating that the defoamer has good anti-foaming performance.

[0020] (2) Compatibility test Test method: After placing the above-mentioned high-speed dispersed paint for 10 minutes, take out a small amount and place it on a glass plate. Use a 75um wet film preparation device to evenly scrape the paint, observe the state of the coating, and express it with a grade. The higher the grade, the better the compatibility.

[0021] Coating grade classification

[0022] (3) The stability of the sample was tested using a Formulaction / Turbiscan Tower / Multiple Light Scattering Stability Analyzer at a test temperature of 40°C and a sample size of 20 g. The smaller the TSI index in the test results, the better the sample stability.

[0023] Test results: (1) Test results of foam suppression performance:

[0024] (2) Product compatibility testing

[0025] (3) Product stability test results

Claims

1. A mineral oil defoamer, characterized in that: It is composed of the following components: A. Carrier oil: Carrier oil is a liquid organic hydrocarbon, and the amount of carrier oil accounts for 80-90% of the total mass of mineral oil defoamer; B. Aliphatic isocyanate; the dosage accounts for 2-5% of the total mass of mineral oil defoamer; C. Amine substances: The dosage accounts for 0.5-1.5% of the total mass of mineral oil defoamer; D. Emulsifier: Emulsifier is a non-ionic surfactant; the amount used accounts for 5-15% of the total mass of mineral oil defoamer.

2. A mineral oil defoamer according to claim 1, characterized in that: The carrier oil is selected from white oil, kerosene, diesel, machine oil, liquid wax, alkylbenzene, naphthenic oil, heavy alkylbenzene, and is used alone or in combination.

3. A mineral oil defoamer according to claim 1, characterized in that: The carrier oil is white oil.

4. A mineral oil defoamer as claimed in claim 1, characterized in that: The structural formula of the aliphatic isocyanate is: (M1)-R-(M2); wherein the M1 and M2 groups are the same or different and are selected from the group -N=C=O-, the group H, and at least one of the M1 and M2 groups is -N=C=O-; and R is an alkyl group with a carbon number of 6-18.

5. A mineral oil defoamer according to claim 1, characterized in that: The amine substance is selected from one or more combinations of 1,3-propylenediamine, diethylenetriamine, tri(2-aminoethyl)amine, 1,6-hexanediamine, octadecane-9-ene-1-amine, and polyethyleneimine.

6. A mineral oil defoamer as claimed in claim 1, characterized in that: The emulsifier is selected from one or more combinations of 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), and nonylphenol polyoxyethylene ether.

7. A mineral oil defoamer according to any one of claims 1 to 6, wherein the preparation method thereof is as follows: (1) Add the carrier oil and amine substance into the reaction container, stir and mix evenly at 25℃~50℃ until the amine substance is completely dissolved; (2) Keep the temperature constant and continue stirring, add aliphatic isocyanate, react for 0.5-2h, add emulsifier, pass through a homogenizer, and finally cool to obtain the mineral oil defoamer.

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