Non-silicon emulsion and preparation method thereof

Abstract

The invention discloses a non-silicon emulsion and a preparation method thereof, and belongs to the technical field of fine chemical engineering. The non-silicon emulsion comprises the following components: 30%-60% of mineral oil, 5%-20% of a polymer, 1%-10% of white carbon black, 2%-15% of an emulsifier, 20%-35% of water and a proper amount of a preservative and a pH regulator. The preparation method comprises the following steps: carrying out high-speed shearing and pre-dispersion on the white carbon black and part of mineral oil at 50-70 DEG C to form slurry; mixing, heating and dissolving the residual mineral oil, the polymer and the emulsifier to form an oil phase; mixing the heated deionized water with a pH regulator to form a water phase; adding the water phase into the oil phase, and carrying out high-speed shearing emulsification; pre-dispersed white carbon black slurry is added for continuous shearing; and finally, adding a preservative and carrying out high-pressure homogenization treatment to obtain the stable emulsion with the particle size of 100-500nm. The prepared non-silicon emulsion has good foam eliminating and inhibiting performance, stability and dispersity, and can be widely applied to the fields of coatings, cosmetics, medicines, pesticides and the like.

Description

Technical Field

[0001] The present invention relates to a non-silicon emulsion and a preparation method thereof, and belongs to the technical field of fine chemical industry. Background Art

[0002] Emulsions, dispersed systems composed of two or more immiscible liquids, are widely used in cosmetics, pharmaceuticals, pesticides, coatings, and other fields. In these applications, the stability, compatibility, and performance characteristics of the emulsion are crucial to product quality. As an important type of emulsion system, non-silicone emulsions have attracted widespread attention in recent years due to their environmental and low-cost advantages.

[0003] Mineral oil, as an important carrier for non-silicon emulsions, has excellent stability and compatibility. CN101991975B discloses a mineral oil-based defoamer, which is composed of mineral oil, fatty acid metal soap, fatty acid amide, white carbon black, a defoaming aid, and an emulsifier. This technical solution uses fatty acid metal soap, fatty acid amide, and white carbon black as defoaming agents and changes the method of mixing the defoaming agents into the mineral oil, thereby improving the stability and anti-foaming performance of the mineral oil defoamer. However, the emulsifier system used in this technical solution is relatively simple and fails to fully utilize the advantages of non-ionic emulsifiers.

[0004] In the emulsion preparation process, silica is an important functional additive, and its dispersion method directly affects product performance. CN102489049B discloses a mineral oil-based defoamer and its preparation method, characterized by providing a defoamer with lower viscosity and fewer shrinkage craters by changing the method of adding materials to the mineral oil system. This method first disperses silica in the mineral oil at high speed until the system is essentially uniform, ensuring that there are no particles larger than 5μm, and then adds other components. Although this step-by-step addition method improves the dispersibility of silica, it still does not solve the fundamental problem of silica's easy agglomeration in the oil phase.

[0005] The use of polymers in emulsion systems is also an important means of improving emulsion stability. WO2025000765A1 discloses a method for preparing a stable fatty alcohol emulsion. During the emulsification process, a nonionic surfactant and an acrylate polymer synergistically emulsify the active ingredient, further improving the stability of the emulsion. This synergistic effect provides new insights into emulsion stability, but this technical solution is primarily targeted at fatty alcohol emulsions, and its applicability to mineral oil emulsion systems remains to be verified.

[0006] In the field of non-silicone defoamers, WO2019232982A1 discloses a non-silicone defoamer and its preparation method. This defoamer utilizes vegetable oils and their derivatives as carriers, with white carbon black and fatty acid metal soaps as the primary defoaming agents. Hydrogenated castor oil and castor oil polyoxyethylene polyoxypropylene ether oleate are also introduced to ensure the product's anti-foaming performance, stability, and compatibility. While this technical solution has achieved good results in vegetable oil systems, it does not address the emulsion stability issues in mineral oil systems.

[0007] CN113577832A discloses a method for preparing a non-silicon defoamer. Using a natural oil as a carrier, an acrylate is introduced into the natural oil structure under the action of a catalyst, improving the defoamer's foam removal and suppression properties while ensuring good product stability and non-stratification. Three different emulsifiers are synergistically compounded to improve the compatibility of the final product. This method improves product stability through the synergistic effect of the emulsifiers, but does not fully consider the synergistic effect of the polymer and nonionic surfactant.

[0008] However, existing technologies still face the following challenges: First, traditional emulsion systems suffer from insufficient stability, easy stratification, and uneven particle size distribution, limiting their application. Second, existing mineral oil emulsions often use anionic or cationic emulsifiers, which can be sensitive to pH and incompatible with specific ingredients. Third, silica dispersed directly in the oil phase tends to agglomerate, affecting emulsion performance. Finally, the synergistic effect of polymers and nonionic surfactants has yet to be fully explored. These issues have severely restricted the application and development of non-silicone emulsions in various fields. Summary of the Invention

[0009] In order to solve technical problems such as insufficient stability of traditional emulsion systems, sensitivity of mineral oil emulsions to pH, easy agglomeration of white carbon black, and insufficient exploration of the synergistic effect of polymers and non-ionic surfactants, and to achieve technical effects such as improving emulsion stability, improving rheological properties and expanding the scope of application, the present invention provides a non-silicone emulsion and a preparation method thereof.

[0010] The technical solution adopted by the present invention to solve its technical problem is: to provide a non-silicone emulsion and a preparation method thereof, wherein the non-silicone emulsion is composed of the following components: 30% to 60% mineral oil, 5% to 20% polymer, 1% to 10% white carbon black, 2% to 15% emulsifier, 20% to 35% water, and 0.1% to 2% preservative and pH regulator.

[0011] Preferably, the mineral oil used as a carrier is a compound composed of carbon atoms and hydrogen atoms, obtained by hydrogenating the 250-415°C fraction of crude oil, including kerosene, diesel, motor oil, white oil, liquid wax, alkylbenzene, and naphthenic oil. These mineral oils are liquid at room temperature and are used in an amount of 30% to 60% of the total mass of the non-silicon emulsion, preferably 40% to 50%. These carriers are used alone or in combination. The mineral oil of the present invention is used in two parts, A-1 and A-2.

[0012] Preferably, the polymer is selected from one or more of polyacrylate, polymethyl polyvinyl alcohol, sodium carboxymethyl cellulose, carbomer, polyvinyl alcohol, xanthan gum, guar gum, and xanthan gum, and the amount used is 5% to 20% of the total mass of the non-silicone emulsion.

[0013] Preferably, the silica is silicon dioxide, which is divided into precipitated silica and fumed silica according to the synthesis method, and divided into hydrophilic silica and hydrophobic silica according to the surface properties. The present invention prefers fumed hydrophobic silica, which has a specific surface area of 20 to 500 m² / g, preferably 90 to 300 m² / g, and is used in an amount of 1% to 10% of the total mass of the non-silicone emulsion.

[0014] Preferably, the emulsifier is a nonionic polyoxyethylene ether, selected from one or more of polyethylene glycol fatty acid esters, fatty alcohol polyoxyethylene ethers, oleic acid polyoxyethylene ethers, castor oil polyoxyethylene ethers, alkylphenol polyoxyethylene ethers, fatty amine polyoxyethylene ethers, polyoxyethylene sorbitan monolaurate (Tween 20), polyoxyethylene sorbitan monopalmitate (Tween 40), polyoxyethylene sorbitan monostearate (Tween 60), polyoxyethylene sorbitan monooleate (Tween 80), and polyoxyethylene sorbitan trioleate (Tween 85). The amount of the emulsifier is 2%-15% of the total amount of the non-silicone emulsion.

[0015] Preferably, the water is deionized water. The amount of water used determines the solid content of the final product. In the present invention, the amount of water used is 20-35% of the total mass of the non-silicon emulsion.

[0016] Preferably, the preservative is selected from methyl parahydroxybenzoate, ethyl parahydroxybenzoate, propyl parahydroxybenzoate, butyl parahydroxybenzoate, sodium diacetate, benzoic acid and its sodium salt, sorbic acid and its potassium salt, dimethyl fumarate, 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 4,5-dichloro-2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, One or more of 1,2-benzoisothiazoline-3-one, 4,5-dichloro-2-n-octyl-4-isothiazoline-3-one, 5-chloro-2-n-octyl-4-isothiazoline-3-one, 1,2-benzoisothiazoline-3-one, N-n-butyl-1,2-benzoisothiazoline-3-one, and 2-methyl-4,5-propylene-4-isothiazoline-3-one. The preservatives can be used alone or in combination of any two or more.

[0017] Preferably, the pH regulator is selected from citric acid, acetic acid, phosphoric acid, sulfuric acid, sodium hydroxide, potassium hydroxide, phosphates, and bicarbonates. The total amount of the preservatives and pH regulators is 0.1%-2% of the total mass of the non-silicone emulsion.

[0018] Preferably, the preparation method of the non-silicon emulsion is as follows:

[0019] (1) Pre-dispersing silica and a portion of mineral oil A-1 at 50-70°C with high-speed shearing (5000-10000 rpm) for 30-60 minutes to form a uniform slurry;

[0020] (2) Mix the remaining mineral oil A-2, polymer and emulsifier, heat to 60-80°C and stir to dissolve to form a uniform oil phase mixture;

[0021] (3) heating deionized water to 50-70° C. and adding a pH adjuster to adjust the pH to 6-8 to form an aqueous phase mixture;

[0022] (4) slowly adding the aqueous phase mixture to the oil phase mixture while high-speed shearing emulsification at 8000-12000 rpm for 10-20 minutes to form a primary emulsion;

[0023] (5) adding the pre-dispersed silica slurry to the primary emulsion and continuing shearing for 5-10 minutes to obtain an emulsion;

[0024] (6) Adding a preservative to the emulsion, circulating the emulsion through a high-pressure homogenizer (20-50 MPa) for 2-3 times, and obtaining a stable emulsion with a particle size of 100-500 nm, which is the non-silicon emulsion of the present invention.

[0025] The beneficial effects of the present invention are:

[0026] 1. By pre-processing silica with a portion of mineral oil with high-speed shear dispersion, the agglomeration problem of silica when directly added to the emulsion is avoided, and silica can be evenly dispersed in the emulsion, thereby improving the thixotropy and storage stability of the emulsion;

[0027] 2. Using nonionic polyoxyethylene ether as an emulsifier to form a composite interfacial film with the polymer effectively reduces the interfacial tension. At the same time, the addition of the polymer enhances the mechanical stability of the emulsion, overcoming the defects of traditional anionic or cationic emulsifiers such as pH sensitivity and incompatibility with specific ingredients;

[0028] 3. By optimizing the process parameters by combining staged emulsification with high-pressure homogenization, the uniform distribution of emulsion particle size is ensured, and the particle size is controlled within the range of 100-500 nm, solving the problem of easy stratification or uneven particle size distribution in traditional emulsion systems;

[0029] 4. The final non-silicone emulsion has high stability and excellent rheological properties. It is suitable for a wide range of fields such as lubricants, coatings, pesticide carriers or cosmetic bases, expanding the application range of emulsions. DETAILED DESCRIPTION

[0030] The technical solutions of the present invention will be described clearly and completely below with reference to the embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0031] Example 1

[0032] (1) 5 parts of white carbon black and 13.5 parts of white oil A-1 were pre-dispersed at 60°C for 45 minutes under high shear (8000 rpm) to form a uniform slurry H1;

[0033] (2) 31.5 parts of white oil A-2, 10 parts of polyacrylate, and 8 parts of polyoxyethylene sorbitan monooleate (Tween 80) were mixed, heated to 70°C, and stirred to dissolve to form a uniform oil phase mixture I1;

[0034] (3) 30 parts of deionized water were heated to 60°C, and 1 part of citric acid was added to adjust the pH to 7 to form an aqueous phase mixture J1;

[0035] (4) Slowly adding the aqueous phase mixture J1 to the oil phase mixture I1, while high-speed shearing emulsification at 10,000 rpm for 15 min to form a primary emulsion K1;

[0036] (5) Add the pre-dispersed silica slurry H1 to the primary emulsion K1 and continue shearing for 8 minutes to obtain emulsion L1;

[0037] (6) One part of methyl paraben was added to the emulsion L1, and the mixture was circulated through a high-pressure homogenizer (30 MPa) for three times to obtain a stable emulsion M1 with a particle size of 300 nm, which is the non-silicone emulsion of the present invention.

[0038] Example 2

[0039] (1) 8 parts of white carbon black and 12.5 parts of liquid wax A-1 were pre-dispersed at 60°C for 50 minutes under high shear (7000 rpm) to form a uniform slurry H2;

[0040] (2) A mixture of 32.5 parts of liquid wax A-2, 15 parts of polyvinyl alcohol, 10 parts of polyoxyethylene sorbitan monostearate (Tween 60) and polyoxyethylene sorbitan monolaurate (Tween 20) was mixed and heated to 75°C and stirred to dissolve to form a uniform oil phase mixture I2;

[0041] (3) 20 parts of deionized water were heated to 65°C, and 0.8 parts of phosphoric acid were added to adjust the pH to 6.5 to form an aqueous phase mixture J2;

[0042] (4) Slowly adding the aqueous phase mixture J2 to the oil phase mixture I2, while high-speed shear emulsification at 11,000 rpm for 18 min to form a primary emulsion K2;

[0043] (5) Add the pre-dispersed silica slurry H2 to the primary emulsion K2 and continue shearing for 7 minutes to obtain emulsion L2;

[0044] (6) 1.2 parts of a mixture of propyl paraben and potassium sorbate were added to the emulsion L2, and the mixture was circulated twice through a high-pressure homogenizer (40 MPa) to obtain a stable emulsion M2 with a particle size of 200 nm, which is the non-silicone emulsion of the present invention.

[0045] Example 3

[0046] (1) 3 parts of white carbon black and 7 parts of naphthenic oil A-1 were pre-dispersed at 70°C for 40 minutes under high shear (6000 rpm) to form a uniform slurry H3;

[0047] (2) 40 parts of naphthenic oil A-2, 8 parts of a mixture of sodium carboxymethyl cellulose and guar gum, and 5 parts of a mixture of polyethylene glycol fatty acid ester and oleic acid polyoxyethylene ether were mixed, heated to 65° C., and stirred to dissolve to form a uniform oil phase mixture I3;

[0048] (3) 35 parts of deionized water were heated to 55°C, and 0.5 parts of sodium hydroxide were added to adjust the pH to 7.5 to form an aqueous phase mixture J3;

[0049] (4) Slowly adding the aqueous phase mixture J3 to the oil phase mixture I3, while high-speed shearing emulsification at 9000 rpm for 12 min to form a primary emulsion K3;

[0050] (5) Add the pre-dispersed silica slurry H3 to the primary emulsion K3 and continue shearing for 6 minutes to obtain emulsion L3;

[0051] (6) 1.5 parts of a mixture of 2-methyl-4-isothiazoline-3-one and 1,2-benzo-isothiazoline-3-one were added to the emulsion L3, and the mixture was circulated through a high-pressure homogenizer (25 MPa) for three times to obtain a stable emulsion M3 with a particle size of 400 nm, which is the non-silicone emulsion of the present invention.

[0052] Example 4

[0053] (1) A mixture A-1 of 1 part silica and 9 parts kerosene and engine oil was pre-dispersed at 70°C under high shear (5000 rpm) for 60 min to form a uniform slurry H4;

[0054] (2) 51 parts of a mixture of kerosene and engine oil A-2, 5 parts of a mixture of carboxycarbohydrate and xanthan gum, and 2 parts of a mixture of castor oil polyoxyethylene ether and fatty amine polyoxyethylene ether were mixed, heated to 60° C., and stirred to dissolve to form a uniform oil phase mixture I4;

[0055] (3) 30 parts of deionized water were heated to 50°C, and 0.2 parts of phosphate were added to adjust the pH to 6 to form an aqueous phase mixture J4;

[0056] (4) Slowly adding the aqueous phase mixture J4 to the oil phase mixture I4, while high-speed shearing emulsification at 8000 rpm for 10 min to form a primary emulsion K4;

[0057] (5) Add the pre-dispersed silica slurry H4 to the primary emulsion K4 and continue shearing for 5 minutes to obtain emulsion L4;

[0058] (6) A mixture of 1.8 parts of butyl paraben and sodium diacetate was added to the emulsion L4, and the mixture was circulated twice through a high-pressure homogenizer (20 MPa) to obtain a stable emulsion M4 with a particle size of 500 nm, which is the non-silicone emulsion of the present invention.

[0059] Example 5

[0060] (1) 10 parts of white carbon black and 12 parts of alkylbenzene A-1 were pre-dispersed at 60°C for 30 minutes under high-speed shearing (10,000 rpm) to form a uniform slurry H5;

[0061] (2) 18 parts of alkylbenzene A-2, 20 parts of a mixture of polymethyl polyvinyl alcohol and xanthan gum, and 15 parts of a mixture of polyoxyethylene sorbitan trioleate (Tween 85) and fatty alcohol polyoxyethylene ether were mixed, heated to 80°C, and stirred to dissolve to form a uniform oil phase mixture I5;

[0062] (3) 30 parts of deionized water were heated to 60°C, and 0.8 parts of bicarbonate were added to adjust the pH to 8 to form an aqueous phase mixture J5;

[0063] (4) Slowly adding the aqueous phase mixture J5 to the oil phase mixture I5, while high-speed shearing emulsification at 12000 rpm for 20 min to form a primary emulsion K5;

[0064] (5) Add the pre-dispersed silica slurry H5 to the primary emulsion K5 and continue shearing for 10 min to obtain emulsion L5;

[0065] (6) 1.2 parts of a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 4,5-dichloro-2-methyl-4-isothiazolin-3-one were added to the emulsion L5, and the mixture was circulated through a high-pressure homogenizer (50 MPa) for three times to obtain a stable emulsion M5 with a particle size of 100 nm, which is the non-silicone emulsion of the present invention.

[0066] Comparative Example 1

[0067] (1) 5 parts of white carbon black and 13.5 parts of white oil A-1 were mixed and stirred at 60°C for 45 minutes to form a uniform slurry H6;

[0068] (2) 31.5 parts of white oil A-2, 10 parts of polyacrylate, and 8 parts of polyoxyethylene sorbitan monooleate (Tween 80) were mixed, heated to 70°C, and stirred to dissolve to form a uniform oil phase mixture I6;

[0069] (3) 30 parts of deionized water were heated to 60°C and 1 part of citric acid was added to adjust the pH to 7 to form an aqueous phase mixture J6;

[0070] (4) Slowly adding the aqueous phase mixture J6 to the oil phase mixture I6, while high-speed shearing emulsification at 10,000 rpm for 15 min to form a primary emulsion K6;

[0071] (5) Add the pre-dispersed silica slurry H6 to the primary emulsion K6 and continue shearing for 8 minutes to obtain emulsion L6;

[0072] (6) One part of methyl paraben was added to the emulsion L6, and the mixture was circulated through a high-pressure homogenizer (30 MPa) for three times to obtain a stable emulsion M6 with a particle size of 300 nm, which is the non-silicone emulsion of the present invention.

[0073] Comparative Example 2

[0074] (1) 8 parts of white carbon black and 12.5 parts of liquid wax A-1 were pre-dispersed at 60°C for 50 min under high shear (7000 rpm) to form a uniform slurry H7;

[0075] (2) A mixture of 32.5 parts of liquid wax A-2, 10 parts of polyoxyethylene sorbitan monostearate (Tween 60) and polyoxyethylene sorbitan monolaurate (Tween 20) was mixed and heated to 75°C and stirred to dissolve to form a uniform oil phase mixture I7;

[0076] (3) 35 parts of deionized water were heated to 65°C, and 0.8 parts of phosphoric acid were added to adjust the pH to 6.5 to form an aqueous phase mixture J7;

[0077] (4) Slowly adding the aqueous phase mixture J7 to the oil phase mixture I7, while high-speed shearing emulsification at 11,000 rpm for 18 min to form a primary emulsion K7;

[0078] (5) Add the pre-dispersed silica slurry H7 to the primary emulsion K7 and continue shearing for 7 minutes to obtain emulsion L7;

[0079] (6) 1.2 parts of a mixture of propyl paraben and potassium sorbate were added to the emulsion L7, and the mixture was circulated twice through a high-pressure homogenizer (40 MPa) to obtain a stable emulsion M7 with a particle size of 200 nm, which is the non-silicone emulsion of the present invention.

[0080] Comparative Example 3

[0081] (1) 12 parts of white carbon black and 15 parts of naphthenic oil A-1 were pre-dispersed at 70°C for 40 minutes under high shear (6000 rpm) to form a uniform slurry H8;

[0082] (2) 50 parts of naphthenic oil A-2, 2 parts of a mixture of sodium carboxymethyl cellulose and guar gum, and 5 parts of a mixture of polyethylene glycol fatty acid ester and oleic acid polyoxyethylene ether were mixed, heated to 65° C., and stirred to dissolve to form a uniform oil phase mixture I8;

[0083] (3) 14 parts of deionized water were heated to 55°C, and 0.5 parts of sodium hydroxide were added to adjust the pH to 7.5 to form an aqueous phase mixture J8;

[0084] (4) Slowly adding the aqueous phase mixture J3 to the oil phase mixture I8, while high-speed shearing emulsification at 9000 rpm for 12 min to form a primary emulsion K8;

[0085] (5) Add the pre-dispersed silica slurry H3 to the primary emulsion K8 and continue shearing for 6 minutes to obtain emulsion L8;

[0086] (6) 1.5 parts of a mixture of 2-methyl-4-isothiazoline-3-one and 1,2-benzo-isothiazoline-3-one were added to the emulsion L8, and the mixture was circulated through a high-pressure homogenizer (25 MPa) for three times to obtain a stable emulsion M8 with a particle size of 400 nm, which is the non-silicone emulsion of the present invention.

[0087] Comparative Example 4

[0088] (1) A mixture of 1 part of white carbon black, 9 parts of a mixture A-1 of kerosene and engine oil, 51 parts of a mixture A-2 of kerosene and engine oil, 5 parts of a mixture of carboxycarbohydrate and xanthan gum, 2 parts of a mixture of castor oil polyoxyethylene ether and fatty amine polyoxyethylene ether, 30 parts of deionized water, 0.2 parts of phosphate, and 1.8 parts of butyl p-hydroxybenzoate and sodium diacetate was subjected to a high-pressure homogenizer (20 MPa) for two cycles to obtain a stable emulsion M9 with a particle size of 500 nm, which is the non-silicone emulsion described in the present invention.

[0089] Comparative Example 5

[0090] (1) 10 parts of white carbon black and 12 parts of alkylbenzene A-1 were pre-dispersed at 60°C for 30 minutes under high-speed shearing (10,000 rpm) to form a uniform slurry H5;

[0091] (2) 18 parts of alkylbenzene A-2, 20 parts of a mixture of polymethyl polyvinyl alcohol and xanthan gum, and 15 parts of a mixture of polyoxyethylene sorbitan trioleate (Tween 85) and fatty alcohol polyoxyethylene ether were mixed, heated to 80°C, and stirred to dissolve to form a uniform oil phase mixture I5;

[0092] (3) 30 parts of deionized water were heated to 60°C, and 0.8 parts of bicarbonate were added to adjust the pH to 8 to form an aqueous phase mixture J5;

[0093] (4) Slowly add the aqueous phase mixture J5 to the oil phase mixture I5 and stir evenly to form a primary emulsion K5;

[0094] (5) Add the pre-dispersed silica slurry H5 to the primary emulsion K5 and stir evenly to obtain emulsion L5;

[0095] (6) 1.2 parts of a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 4,5-dichloro-2-methyl-4-isothiazolin-3-one were added to the emulsion L5 and stirred uniformly to obtain the emulsion M10, which is the non-silicone emulsion of the present invention.

[0096] Performance Testing

[0097] (1) Compatibility test

[0098] Test method: Add 200g of self-prepared water-based paint to a 1000ml stainless steel cup, then add 0.3% non-silicone emulsion, use a laboratory high-speed disperser to disperse at a speed of 1000rpm 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.

[0099] Coating grade classification:

[0100]

[0101] Compatibility test results:

[0102]

[0103] (2) Stability test

[0104] The stability of the sample was tested using a Formulaaction / 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.

[0105]

[0106] (3) Foam suppression performance test

[0107] Test method: Add 200g of self-prepared water-based paint to a 1000ml stainless steel cup, then add 0.3% non-silicone emulsion, use a laboratory high-speed disperser to disperse at a speed of 1000rpm for 10 minutes, pour it into a 1000ml measuring cylinder immediately after stopping, record the weight and volume of the liquid, and calculate the specific gravity. A larger specific gravity value indicates a smaller air content, indicating that the non-silicone emulsion has good anti-foaming performance.

[0108] The test results are as follows:

[0109]

Claims

1. A method for preparing a non-silicone emulsion according to the present invention is characterized in that: It is composed of the following components: The amount of mineral oil in component A is 30-60% of the total mass of the non-silicone emulsion; The amount of component B polymer is 5-20% of the total mass of the non-silicone emulsion; The amount of component C white carbon black is 1 to 10% of the total mass of the non-silicone emulsion; The amount of component D emulsifier is 2-15% of the total mass of the non-silicone emulsion; The amount of water used in component E is 20-35% of the total mass of the non-silicone emulsion; The total amount of component F preservative and component G pH regulator is 0.1-2% of the total non-silicon mass; The preparation method of the non-silicon emulsion is as follows: (1) Pre-disperse silica C and part of mineral oil A-1 at 50-70°C under high-speed shear (5000-10000 rpm) for 30-60 minutes to form a uniform slurry H; (2) Mix the remaining mineral oil A-2, polymer B and emulsifier D, heat to 60-80°C, and stir to dissolve to form a uniform oil phase mixture I; (3) Deionized water E is heated to 50-70°C, and a pH regulator G is added to adjust the pH to 6-8 to form an aqueous phase mixture J; (4) Slowly add the aqueous phase mixture J to the oil phase mixture I, and simultaneously emulsify at a high shear speed of 8000-12000 rpm for 10-20 minutes to form a primary emulsion K; (5) Add the pre-dispersed silica slurry H to the primary emulsion K and continue shearing for 5-10 minutes to obtain emulsion L; (6) Add preservative F to the emulsion L and process it through a high-pressure homogenizer (20-50 MPa) for 2-3 cycles to obtain a stable emulsion M with a particle size of 100-500 nm, which is the non-silicone emulsion of the present invention.

2. A method for preparing a non-silicone emulsion according to claim 1, characterized in that the mineral oil of component A is used as a carrier, and is a compound composed of carbon atoms and hydrogen atoms; substances obtained by hydrogenating the 250-415°C fraction of crude oil include kerosene, diesel, motor oil, white oil, liquid paraffin, alkylbenzene, and naphthenic oil; these carriers are used alone or in combination; and the mineral oil of the present invention is used in two parts, A-1 and A-2.

3. The method for preparing a non-silicone emulsion according to claim 1, wherein the component B polymer is selected from one or more of polyacrylate, polymethyl polyvinyl alcohol, sodium carboxymethyl cellulose, carbomer, polyvinyl alcohol, xanthan gum, guar gum, and xanthan gum.

4. The method for preparing a non-silicone emulsion according to claim 1, wherein the component C, silica, is divided into two types according to the synthesis method, precipitated silica and fumed silica, and is divided into two types according to the surface properties, hydrophilic silica and hydrophobic silica. The present invention prefers fumed hydrophobic silica; its specific surface area is 20 to 500 m 2 / g, preferably 90 to 300 m 2 / g.

5. The method for preparing a non-silicone emulsion according to claim 1, wherein the emulsifier of component D is a nonionic polyoxyethylene ether selected from the group consisting of polyethylene glycol fatty acid esters, fatty alcohol polyoxyethylene ethers, oleic acid polyoxyethylene ethers, castor oil polyoxyethylene ethers, alkylphenol polyoxyethylene ethers, fatty amine polyoxyethylene ethers, polyoxyethylene sorbitan monolaurate (Tween 20), polyoxyethylene sorbitan monopalmitate (Tween 40), polyoxyethylene sorbitan monostearate (Tween 60), polyoxyethylene sorbitan monooleate (Tween 80), and polyoxyethylene sorbitan trioleate (Tween 85).

6. The method for preparing a non-silicone emulsion according to claim 1, wherein the water as component E is deionized water, and the amount used determines the solid content of the final product.

7. The method for preparing a non-silicone emulsion according to claim 1, wherein the preservative in component F is selected from methyl parahydroxybenzoate, ethyl parahydroxybenzoate, propyl parahydroxybenzoate, butyl parahydroxybenzoate, sodium diacetate, benzoic acid and its sodium salt, sorbic acid and its potassium salt, dimethyl fumarate, 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 4,5-dichloro-2-methyl-4-isothiazolin-3-one, -ketone, 2-n-octyl-4-isothiazoline-3-one, 4,5-dichloro-2-n-octyl-4-isothiazoline-3-one, 5-chloro-2-n-octyl-4-isothiazoline-3-one, 1,2-benzo-isothiazoline-3-one, N-n-butyl-1,2-benzo-isothiazoline-3-one, 2-methyl-4,5-propylene-4-isothiazoline-3-one or more; the preservatives can be used alone or in combination of any two or more.

8. The method for preparing a non-silicone emulsion according to claim 1, wherein the pH regulator of component G is selected from citric acid, acetic acid, phosphoric acid, sulfuric acid, sodium hydroxide, potassium hydroxide, phosphate, and bicarbonate.

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