A mineral oil antifoam agent and a method for preparing the same

Abstract

This invention discloses a mineral oil defoamer and its preparation method, achieving an excellent balance between defoaming and foam-suppressing performance, stability, and compatibility. The production process is deeply optimized based on the characteristics of the raw materials. First, a portion of the mineral oil is fully swollen and mixed with a special structured fatty acid metal soap to form a specific three-dimensional network structure, forming mixture M. Then, a portion of the mineral oil is fully mixed with oxidized polyethylene wax with a specific acid value to form a wax gel mixture N, improving defoaming and anti-settling properties. The two mixtures are premixed with a selected emulsifier, and then polyglycerol ester is added and thoroughly stirred. Utilizing the special structure of polyglycerol ester, a stable emulsion system can be formed between the mixture and the emulsifier, improving compatibility while also maximizing the defoaming and foam-suppressing performance of the defoamer.

Description

Technical Field

[0001] This invention relates to a mineral oil defoamer and its preparation method. Defoamers belong to fine chemical additives, therefore, this invention belongs to the field of fine chemical technology. Background Technology

[0002] Besides their aesthetic appeal, coatings form a strong, solid film, acting as a protective layer. However, a common problem is foaming. Water-based and solvent-based coatings use various additives in their formulations, most of which are surfactants. These surfactants alter the surface tension of the coating, contributing to its tendency to foam. External factors also contribute to foaming, including stirring and high-speed dispersion during coating manufacturing, and the shearing effects of spraying, rolling, and brushing during application. Excessive foam, if not promptly eliminated, can cause defects such as pinholes, craters, fisheyes, and orange peel when applied to objects, affecting both finish and protection. Adding a defoamer is crucial to solving the foaming problem in coatings.

[0003] Defoamers for coatings are divided into three main categories: mineral oil defoamers, silicone defoamers, and polyether defoamers. Mineral oil defoamers are characterized by rapid defoaming, high efficiency, long-lasting defoaming effect, and good economy.

[0004] CN101310814 introduces a defoaming system of mineral oil and silicone grease, which improves defoaming and foam-suppressing capabilities; however, its application in water-based coatings causes severe pinhole and edge shrinkage problems. CN102489049A premixes metal soap with alcohol solvents to reduce gelation in the metal soap / hydrocarbon system and prevents the defoamer from becoming too viscous and causing stratification; however, the introduction of alcohol solvents affects the defoamer's defoaming and foam-suppressing performance. CN101991975A melts fatty acid amides and metal soaps separately and then mixes them at low temperatures to improve product stability; however, the presence of fatty acid amides still disrupts the gelation of metal soaps, affecting product stability. CN104479439A introduces alkyl silicone oil and silica into a mineral oil defoamer, which synergistically works with metal soap to improve the defoamer's defoaming and foam-suppressing performance; however, the compatibility of the defoamer needs improvement. Summary of the Invention

[0005] To address the shortcomings of the aforementioned mineral oil defoamers, this invention provides a mineral oil defoamer that achieves an excellent balance between defoaming and foam-suppressing performance, stability, and compatibility. The production process is deeply optimized based on the characteristics of the raw materials. First, a portion of the mineral oil is fully swollen and mixed with a special structured fatty acid metal soap to form a specific three-dimensional network structure, forming mixture M. Then, a portion of the mineral oil is fully mixed with oxidized polyethylene wax with a specific acid value to form a wax gel mixture N, enhancing defoaming and anti-settling properties. The two mixtures are premixed with a selected emulsifier, and then polyglycerol ester is added and thoroughly stirred. Utilizing the special structure of polyglycerol ester, a stable emulsion system is formed between the mixture and the emulsifier, improving compatibility while simultaneously enhancing the defoaming and foam-suppressing performance of the defoamer.

[0006] The mineral oil defoamer of the present invention is composed of the following components:

[0007] A. Mineral oil

[0008] The mineral oil, acting as a carrier, is a compound composed of carbon and hydrogen atoms; it includes kerosene, diesel, engine oil, white oil, liquid wax, alkylbenzene, and naphthenic oil, used alone or in combination; the amount of mineral oil used is 60-85% of the total mass of the defoamer; the mineral oil is used in two parts, A1 and A2, with A1 accounting for 70-90% of the total mass of the mineral oil and A2 accounting for 10-30% of the total mass of the mineral oil.

[0009] B. Defoaming substances

[0010] The defoaming substance is a fatty acid metal soap; selected from one or more of magnesium salts, aluminum salts, calcium salts, and zinc salts of fatty acids, preferably one or two of mono-fatty acid aluminum and di-fatty acid aluminum, mixed in any proportion, and the amount used is 2 to 20% of the total mass of the defoamer.

[0011] C. Defoaming aids

[0012] The defoaming agent is oxidized polyethylene wax, and the acid value of the oxidized polyethylene wax is ≥11 mg KOH / g. -1 The dosage is 3-8% of the total mass of the defoamer.

[0013] D. Emulsifiers

[0014] The emulsifier is a nonionic surfactant selected from fatty alcohol polyoxyethylene ether, oleic acid polyoxyethylene ether, castor oil polyoxyethylene ether, polyoxyethylene fatty amine compounds, 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), and sorbitan trioleate (Span-85), used alone or in combination; the amount of emulsifier is 2-15% of the amount of defoamer.

[0015] E. Stabilizers

[0016] The stabilizer is at least one polyglycerol fatty acid ester with the following structural formula:

[0017]

[0018] Where R is oleic acid, stearic acid, lauric acid, ricinoleic acid, myristic acid, caprylic acid, decanoic acid, palmitic acid, and the subscript n is an integer from 2 to 30, preferably from 2 to 12; the amount of stabilizer is 2 to 10% of the amount of defoamer.

[0019] A method for preparing a mineral oil defoamer is as follows:

[0020] (1) Mix defoaming agent B and mineral oil A1 in a sealed container, using the melting point B of defoaming agent B as the reference. mp Based on ℃, heat the temperature to [B] mp +(5~10)]℃, then rapidly cool down to 50~70℃, controlling the cooling rate ≥5℃ / min, to form mixture M;

[0021] (2) Mix defoaming agent C and mineral oil A2 in a sealed container, using the melting point C of defoaming agent C as the reference. mp Based on ℃, heat the temperature to [C] mp +(5~10)]℃, then rapidly cool down to 50~70℃, controlling the cooling rate ≥5℃ / min, to form a mixture N;

[0022] (3) Mixture M, mixture N, emulsifier, and stabilizer are mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1 to 3 hours to obtain the final mineral oil defoamer. Detailed Implementation

[0023] Example 1

[0024] (1) Mix 8g of defoaming agent calcium stearate and 52g of white oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +5]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture M1;

[0025] (2) Oxidize polyethylene wax with 7g of defoaming agent (acid value 14 mgKOH.g) -1 Mix 1g of defoaming agent and 13g of white oil in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +7]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture N1;

[0026] (3) Mixture M1, mixture N1, 10g of a mixture of sorbitan monooleate and sorbitan monostearate, and 10g of a mixture of polyglycerol-2 ricinoleate and polyglycerol-12 oleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1.5h to obtain the final mineral oil defoamer.

[0027] Example 2

[0028] (1) Mix 10g of the defoaming agent aluminum butyrate and aluminum dioctanoate mixture with 49g of kerosene in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +6]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture M2;

[0029] (2) Oxidize polyethylene wax with 8g of defoaming agent (acid value 11 mgKOH.g) -1 Mix 21g of kerosene with the defoaming agent in a sealed container, using the defoaming agent's melting point C. mp Based on ℃, heat the temperature to [C] mp +8]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form a mixture N2;

[0030] (3) Mixture M2, mixture N2 and 5g of polyoxyethylene dehydrated sorbitan monopalmitate, 7g of polyglycerol-10 myristate and polyglycerol-18 stearate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3h to obtain the final mineral oil defoamer.

[0031] Example 3

[0032] (1) Mix 5g of aluminum stearate (an antifoaming agent) and 76.5g of alkylbenzene in a sealed container, using the melting point B of the antifoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +7]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form mixture M3;

[0033] (2) Oxidize polyethylene wax with 4g of defoaming agent (acid value 12 mgKOH.g) -1 Mix 8.5g of alkylbenzene with the defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +9]℃, then rapidly cool down to 65℃, controlling the cooling rate ≥5℃ / min, to form a mixture N3;

[0034] (3) Mixture M3, mixture N3, 2g of polyoxyethylene sorbitan monooleate and 4g of polyglycerol-30 laurate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1 hour to obtain the final mineral oil defoamer.

[0035] Example 4

[0036] (1) Mix 10g of the defoaming agent aluminum pentadecanoate and aluminum eicosanoate mixture with 51g of diesel oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +8]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form mixture M4;

[0037] (2) Oxidize polyethylene wax (acid value 14 mg KOH.g) with 7 g of defoaming agent. -1 Mix 9g of diesel oil with 9g of defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +10]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form mixture N4;

[0038] (3) Mixture M4, mixture N4 and 8g of polyoxyethylene sorbitan monostearate, 5g of polyglycerol-16 myristate and polyglycerol-30 octanoate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3h to obtain the final mineral oil defoamer.

[0039] Example 5

[0040] (1) Mix 10g of the defoaming agent aluminum bis(hexadecenoic acid) and aluminum dibutyrate with 72g of white oil in a sealed container, using the melting point B of the defoaming agent as the reference. mpBased on ℃, heat the temperature to [B] mp +9]℃, then rapidly cool down to 65℃, controlling the cooling rate ≥5℃ / min, to form mixture M5;

[0041] (2) Oxidize polyethylene wax with 3g of defoaming agent (acid value 13mgKOH.g) -1 Mix 8g of white oil and 8g of defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +9]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form mixture N5;

[0042] (3) Mixture M5, mixture N5, 5g of oleic acid polyoxyethylene ether, and 2g of polyglycerol-2 oleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3 hours to obtain the final mineral oil defoamer.

[0043] Example 6

[0044] (1) Mix 15g of the defoaming agent calcium stearate + zinc stearate mixture with 45.5g of white oil in a sealed container, based on the melting point B of the defoaming agent. mp Based on ℃, heat the temperature to [B] mp +10]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form mixture M6;

[0045] (2) Oxidize polyethylene wax with 3g of defoaming agent (acid value 11mgKOH.g) -1 Mix 19.5g of white oil in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +5]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture N6;

[0046] (3) Mixture M6, mixture N6 and 9g of dehydrated sorbitan trioleate, 8g of polyglycerol-12 decanoate and polyglycerol-30 palmitate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2 hours to obtain the final mineral oil defoamer.

[0047] Example 7

[0048] (1) Mix 14g of the defoaming agent aluminum eicosanoate and calcium stearate with 45g of white oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +9]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form mixture M7;

[0049] (2) Oxidize polyethylene wax with 6g of defoaming agent (acid value 14mgKOH.g) -1 Mix 15g of white oil with the defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +7]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture N7;

[0050] (3) Mixture M7, mixture N7 and 12g castor oil polyoxyethylene ether, 8g polyglycerol-2 decanoate and polyglycerol-16 laurate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2.5h to obtain the final mineral oil defoamer.

[0051] Example 8

[0052] (1) Mix 15g of the defoaming agent, a mixture of aluminum di(hexadecanoate) and aluminum linoleate, with 62.05g of alkylbenzene in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +5]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture M8;

[0053] (2) Oxidize polyethylene wax with 6g of defoaming agent (acid value 14mgKOH.g) -1 ) and 10.95g of alkylbenzene were mixed in a sealed container, with the defoaming agent's melting point C. mp Based on ℃, heat the temperature to [C] mp +5]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture N8;

[0054] (3) Mixture M8, mixture N8, 3g of dehydrated sorbitan monopalmitate, and 3g of polyglycerol-16 ricinoleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3 hours to obtain the final mineral oil defoamer.

[0055] Example 9

[0056] (1) Mix 2g of magnesium stearate (an antifoaming agent) and 56g of liquid wax in a sealed container, using the melting point B of the antifoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +7]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture M9;

[0057] (2) Oxidize polyethylene wax with 5g of defoaming agent (acid value 12mgKOH.g) -1Mix 14g of liquid wax with the defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +6]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form mixture N9;

[0058] (3) Mixture M9, mixture N9 and 15g of polyoxyethylene sorbitan monooleate, 8g of polyglycerol-2 palmitate and polyglycerol-30 ricinoleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2.5h to obtain the final mineral oil defoamer.

[0059] Example 10

[0060] (1) Mix 18g of the defoaming agent aluminum dicoctadecanoate and aluminum docosanoate with 49g of white oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +5]℃, then rapidly cool down to 65℃, controlling the cooling rate ≥5℃ / min, to form mixture M10;

[0061] (2) Oxidize polyethylene wax with 3g of defoaming agent (acid value 11mgKOH.g) -1 Mix 21g of white oil and 21g of defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +5]℃, then rapidly cool down to 65℃, controlling the cooling rate ≥5℃ / min, to form mixture N10;

[0062] (3) Mixture M10, mixture N10, 7g of polyoxyethylene dehydrated sorbitan monolaurate and fatty alcohol polyoxyethylene ether mixture, and 2g of polyglycerol-12 stearate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2 hours to obtain the final mineral oil defoamer.

[0063] Comparative Example 1

[0064] (1) Mix 10g of defoaming agent calcium stearate and 48g of white oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +3]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture M11;

[0065] (2) Oxidize polyethylene wax with 8g of defoaming agent (acid value 14mgKOH.g) -1 Mix 1g of defoaming agent and 12g of white oil in a sealed container, using the melting point C of the defoaming agent. mpBased on ℃, heat the temperature to [C] mp +7]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture N11;

[0066] (3) Mixture M11, mixture N11, 10g of a mixture of sorbitan monooleate and sorbitan monostearate, and 10g of a mixture of polyglycerol-2 ricinoleate and polyglycerol-12 oleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1.5h to obtain the final mineral oil defoamer.

[0067] Comparative Example 2

[0068] (1) Mix 7g of magnesium stearate (an antifoaming agent) and 60g of liquid wax in a sealed container, using the melting point B of the antifoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +7]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture M12;

[0069] (2) Oxidize polyethylene wax with 5g of defoaming agent (acid value 12mgKOH.g) -1 Mix 15g of liquid wax with the defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +2]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form a mixture N12;

[0070] (3) Mixture M12, mixture N12 and 8g of polyoxyethylene sorbitan monooleate, 5g of polyglycerol-2 palmitate and polyglycerol-30 ricinoleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2.5h to obtain the final mineral oil defoamer.

[0071] Comparative Example 3

[0072] (1) Mix 8g of the defoaming agent calcium stearate and zinc stearate mixture with 70.2g of white oil in a sealed container, based on the melting point B of the defoaming agent. mp Based on ℃, heat the temperature to [B] mp +10]℃, then rapidly cool down to 30℃, controlling the cooling rate ≥5℃ / min, to form mixture M13;

[0073] (2) Oxidize polyethylene wax with 5g of defoaming agent (acid value 11mgKOH.g) -1 Mix 7.8g of white oil in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp+5]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture N13;

[0074] (3) Mixture M13, mixture N13 and 7g of dehydrated sorbitan trioleate, 2g of polyglycerol-12 decanoate and polyglycerol-30 palmitate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2 hours to obtain the final mineral oil defoamer.

[0075] Comparative Example 4

[0076] (1) Mix 12g of the defoaming agent aluminum eicosanoate and calcium stearate with 48.75g of white oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +9]℃, then rapidly cool down to 85℃, controlling the cooling rate ≥5℃ / min, to form mixture M14;

[0077] (2) Oxidize polyethylene wax (acid value 14 mg KOH.g) with 7 g of defoaming agent. -1 Mix 16.25g of white oil in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +7]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture N14;

[0078] (3) Mixture M14, mixture N14 and 8g castor oil polyoxyethylene ether, 8g polyglycerol-2 decanoate and polyglycerol-16 laurate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 2.5h to obtain the final mineral oil defoamer.

[0079] Comparative Example 5

[0080] (1) Mix 8g of aluminum stearate (an antifoaming agent) and 52.5g of alkylbenzene in a sealed container, using the melting point B of the antifoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +7]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form mixture M15;

[0081] (2) Oxidize polyethylene wax with 3g of defoaming agent (acid value 12mgKOH.g) -1 ) and 17.5g of alkylbenzene were mixed in a sealed container, with the defoaming agent's melting point C. mp Based on ℃, heat the temperature to [C] mp +9]℃, then rapidly cool down to 35℃, controlling the cooling rate ≥5℃ / min, to form mixture N15;

[0082] (3) Mixture M15, mixture N15, 10g of polyoxyethylene sorbitan monooleate and 9g of polyglycerol-30 laurate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1 hour to obtain the final mineral oil defoamer.

[0083] Comparative Example 6

[0084] (1) Mix 12g of the defoaming agent aluminum pentadecanoate and aluminum eicosanoate with 55.25g of diesel oil in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +8]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form mixture M16;

[0085] (2) Oxidize polyethylene wax (acid value 14 mg KOH.g) with 7 g of defoaming agent. -1 Mix 9.75g of diesel oil with the defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +10]℃, then rapidly cool down to 80℃, controlling the cooling rate ≥5℃ / min, to form mixture N16;

[0086] (3) Mixture M16, mixture N16 and 9g of polyoxyethylene sorbitan monostearate, 7g of polyglycerol-16 myristate and polyglycerol-30 octanoate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3h to obtain the final mineral oil defoamer.

[0087] Comparative Example 7

[0088] (1) Mix 5g of aluminum stearate (an antifoaming agent) and 60g of alkylbenzene in a sealed container, using the melting point B of the antifoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +7]℃, then rapidly cool down to 50℃, controlling the cooling rate ≥5℃ / min, to form mixture M17;

[0089] (2) Oxidize polyethylene wax with 3g of defoaming agent (acid value 12mgKOH.g) -1 Mix 20g of alkylbenzene with the defoaming agent in a sealed container, using the melting point C of the defoaming agent. mp Based on ℃, heat the temperature to [C] mp +9]℃, then rapidly cool down to 65℃, controlling the cooling rate ≥5℃ / min, to form mixture N17;

[0090] (3) Mixture M17, mixture N17 and 12g of polyoxyethylene dehydrated sorbitan monooleate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1 hour to obtain the final mineral oil defoamer.

[0091] Comparative Example 8

[0092] (1) Add 8g of calcium stearate (an antifoaming agent) and 7g of oxidized polyethylene wax (an antifoaming aid with an acid value of 14 mgKOH) to the defoaming agent. -1 Mix 65g of white oil in a sealed container, using the melting point B of the defoaming agent. mp Based on ℃, heat the temperature to [B] mp +5]℃, then rapidly cool down to 55℃, controlling the cooling rate ≥5℃ / min, to form mixture M1;

[0093] (2) Mixture M1, 10g of a mixture of sorbitan monooleate and sorbitan monostearate, and 10g of a mixture of polyglycerol-2 ricinoleate and polyglycerol-12 oleate were mixed and stirred evenly at room temperature. After circulating through a colloid mill for 1.5h, the final mineral oil defoamer was obtained.

[0094] Comparative Example 9

[0095] (1) Mix 10g of defoaming agent silica and 49g of kerosene in a sealed container, using the melting point B of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [B] mp +6]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture M2;

[0096] (2) Oxidize polyethylene wax with 8g of defoaming agent (acid value 11 mgKOH.g) -1 Mix 21g of kerosene with the defoaming agent in a sealed container, using the defoaming agent's melting point C. mp Based on ℃, heat the temperature to [C] mp +8]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form a mixture N2;

[0097] (3) Mixture M2, mixture N2 and 5g of polyoxyethylene dehydrated sorbitan monopalmitate, 7g of polyglycerol-10 myristate and polyglycerol-18 stearate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3h to obtain the final mineral oil defoamer.

[0098] Comparative Example 10

[0099] (1) Mix 10g of the defoaming agent aluminum butyrate and aluminum dioctanoate mixture with 49g of kerosene in a sealed container, using the melting point B of the defoaming agent as the reference. mpBased on ℃, heat the temperature to [B] mp +6]℃, then rapidly cool down to 60℃, controlling the cooling rate ≥5℃ / min, to form mixture M2;

[0100] (2) Mix 8g of defoaming agent silica and 21g of kerosene in a sealed container, using the melting point C of the defoaming agent as the reference. mp Based on ℃, heat the temperature to [C] mp +8]℃, then rapidly cool down to 70℃, controlling the cooling rate ≥5℃ / min, to form a mixture N2;

[0101] (3) Mixture M2, mixture N2 and 5g of polyoxyethylene dehydrated sorbitan monopalmitate, 7g of polyglycerol-10 myristate and polyglycerol-18 stearate were mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 3h to obtain the final mineral oil defoamer.

[0102] Test methods

[0103] (1) Foam suppression performance test

[0104] Test method: Add 200g of self-prepared water-based paint to a 1000ml stainless steel cup, then add 0.3% defoamer. Use a laboratory high-speed disperser to disperse at 1000rpm for 10 minutes. Immediately after stopping, pour the mixture into a 1000ml graduated cylinder, record the weight and volume of the liquid, and calculate the specific gravity. A higher specific gravity indicates a lower air content, indicating that the defoamer has good foam suppression performance.

[0105] (2) Compatibility test

[0106] Test method: After the above high-speed dispersed coating is left to stand for 10 minutes, a small amount is taken out and placed on a glass plate. The coating is then uniformly scraped and leveled using a 75µm wet film preparation device. The state of the coating is observed and indicated by a grade. The higher the grade, the better the compatibility.

[0107] Table 1. Coating Grade Classification

[0108]

[0109] (3) The stability of the sample was tested using a Formulaction / Turbiscan Tower / Multiple Light Scattering Stability Analyzer. The test temperature was 40℃ and the sample amount was 20g. The smaller the TSI index in the test results, the better the sample stability.

[0110] The test results are as follows:

[0111] (1) Results of foam suppression and defoaming performance test:

[0112]

[0113] (2) Compatibility test results:

[0114]

[0115] (3) Stability test results:

[0116]

Claims

1. A mineral oil defoamer, characterized in that, It consists of the following components: A. Mineral oil The mineral oil, acting as a carrier, is a compound composed of carbon and hydrogen atoms; it includes kerosene, diesel oil, engine oil, white oil, liquid wax, alkylbenzene, and naphthenic oil, used alone or in combination; the mineral oil is used in two parts, A1 and A2; the amount of mineral oil used is 60-85% of the total mass of the defoamer; B. Defoaming substances The defoaming substance is a fatty acid metal soap; selected from one or more of magnesium salts, aluminum salts, calcium salts, and zinc salts of fatty acids, and the amount used is 2-20% of the total mass of the defoamer; C. Defoaming aids The defoaming agent is oxidized polyethylene wax, and its dosage is 3-8% of the total mass of the defoaming agent; D. Emulsifiers The emulsifier is a nonionic surfactant selected from fatty alcohol polyoxyethylene ether, oleic acid polyoxyethylene ether, castor oil polyoxyethylene ether, polyoxyethylene fatty amine compounds, 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), and sorbitan trioleate (Span-85), used alone or in combination; the amount of emulsifier is 2-15% of the amount of defoamer. E. Stabilizers The stabilizer is at least one polyglycerol fatty acid ester with the following structural formula: Where R is oleic acid, stearic acid, lauric acid, ricinoleic acid, myristic acid, caprylic acid, decanoic acid, or palmitic acid; the subscript n is an integer from 2 to 30, preferably from 2 to 12; the amount of stabilizer is 2 to 10% of the amount of defoamer. Using the above components, a mineral oil defoamer is prepared as follows: (1) Mix defoaming substance B and mineral oil A1 in a sealed container. Based on the melting point Bmp℃ of defoaming substance B, heat the temperature to [Bmp+(5~10)]℃, and then rapidly cool it down to 50~70℃, controlling the cooling rate ≥5℃ / min to form mixture M. (2) Mix defoaming agent C and mineral oil A2 in a sealed container. Based on the melting point Cmp℃ of defoaming agent C, heat the temperature to [Cmp+(5~10)]℃, and then rapidly cool it down to 50~70℃, controlling the cooling rate to ≥5℃ / min to form mixture N; (3) Mixture M, mixture N, emulsifier, and stabilizer are mixed and stirred evenly at room temperature, and then circulated through a colloid mill for 1 to 3 hours to obtain the final mineral oil defoamer.

2. The mineral oil defoamer according to claim 1, characterized in that... The amount of mineral oil A1 used accounts for 70-90% of the total mass of mineral oil, and the amount of A2 used accounts for 10-30% of the total mass of mineral oil.

3. The mineral oil defoamer according to claim 1, characterized in that... The defoaming substance is selected from one or two of aluminum monofatty acid and aluminum difatty acid, mixed in any proportion.

4. The mineral oil defoamer according to claim 1, characterized in that... The defoaming agent, oxidized polyethylene wax, has an acid value ≥11 mg KOH.g -1 .

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