Preparation method for stable fatty alcohol emulsion

Abstract

A preparation method for a stable fatty alcohol emulsion. A silane coupling agent is used for carrying out surface modification on silicon dioxide to finally obtain modified silicon dioxide, and the modified silicon dioxide is adsorbed on the interface of defoaming active substances and water, so that the active substances are dispersed, the problem of product creaming caused by aggregation is avoided, and the defoaming performance of the product is improved; in addition, during emulsification, a non-ionic surfactant and an acrylate polymer act synergistically to emulsify the active substances, so that the stability of the emulsion is further improved.

Description

A preparation method of stable fatty alcohol emulsion Technical Field

[0001] The invention relates to a preparation method of a fatty alcohol emulsion, and therefore the invention belongs to the technical field of fine chemicals. Background Art

[0002] In the wet end of papermaking, sizing agents, retention and drainage aids, reinforcing agents, deinking agents, dry strength agents and other surface-active additives are used depending on the type of paper. During the circulation of white water in papermaking, bubbles are easily generated. The presence of these bubbles has a great impact on the paper, resulting in poor sizing, spots, translucent spots and small holes on the paper surface, and even causing paper breaks. It is also easy to reduce the operating efficiency of the pump and increase energy consumption.

[0003] The application of fatty alcohol emulsion defoamers in the wet end of papermaking is a mature technology. Over the years of research, in addition to using fatty alcohols, technicians have also introduced paraffin wax, oils, white carbon black and other substances as defoaming active substances to continuously improve the product's defoaming and antifoaming properties. However, due to the large number of active substances, the emulsification process has different requirements for emulsifiers and emulsification processes, making it difficult to balance them. This leads to emulsion instability and easily causes problems such as emulsion creaming or stratification. Researchers have studied the stability of emulsions as follows:

[0004] In CN101780383A, an emulsifying substance and a defoaming active substance (higher alcohol, glycerol polyether, acetylene alcohol) are dissolved in a dispersion medium, and after pre-emulsification by heating, a stable emulsion is prepared by homogenization for a long time. The preparation of the emulsion is time-consuming and costly. In CN103628353A, a high-speed disperser is used to strongly disperse a fatty alcohol emulsion, and a high molecular weight substance is introduced to prepare a stable emulsion. The preparation method is relatively complicated. US5807502 uses a C6-18 1,2- Adducts of glycols and ethylene oxide are used as emulsifiers to stabilize fatty alcohol emulsions, but such emulsifiers are difficult to purchase on the market and the raw materials for their synthesis are expensive. CN1781574A uses adducts of C2-4 alkylene oxides and primary alcohols with branched alkyl groups to stabilize fatty alcohol emulsions, but such methods cannot solve the stability problem of natural fatty alcohol emulsions. CN107137959A separately prepares fatty alcohols, paraffin waxes, and oils into emulsions using nonionic surfactants, thickeners, and water, and then mixes these three emulsions with anionic surfactants at room temperature to prepare a stable emulsion, resulting in a relatively complex preparation process. CN113577836A introduces different types of emulsifiers, and during the preparation process, different types of emulsifiers are added in batches at different temperatures for emulsification, thereby avoiding the problem of excessive emulsions during the emulsification process, which leads to poor product stability. At the same time, the introduction of higher fatty alcohol fatty acid esters improves the foam suppression performance and further improves the stability of the product. During the preparation process, the preparation temperature needs to be constantly monitored. The preparation method is complicated. In order to improve the anti-foaming performance, other substances need to be introduced, which brings hidden dangers to the guarantee of product stability.

[0005] In summary, the above patents mainly improve the stability of fatty alcohol emulsions through relatively complex processes. At the same time, in order to take into account the anti-foaming performance, other substances need to be added, which brings new problems to the guarantee of stability.

[0006] Summary of the Invention

[0007] The present invention utilizes a silane coupling agent to perform surface modification on silica. The resulting modified silica can be adsorbed on the interface between a defoaming active substance and water, thereby dispersing the active substance and preventing aggregation from causing the product to become creamy. This also improves the defoaming and antifoaming properties of the product. Furthermore, during the emulsification process, a nonionic surfactant and an acrylate polymer synergistically emulsify the active substance, further improving the stability of the emulsion.

[0008] Technical Solution

[0009] The stable fatty alcohol emulsion prepared by the present invention consists of the following components:

[0010] A. Fatty alcohol

[0011] The fatty alcohol is a monohydric to trihydric alcohol containing C12-C30, selected from one or a mixture of synthetic fatty alcohols and natural fatty alcohols. Synthetic fatty alcohols can be obtained by oxidation of alkyl aluminum via the Ziegler process or by carbonyl synthesis; natural fatty alcohols can be obtained by extraction from oils and fats. Specifically, the fatty alcohols include fatty alcohols containing a single carbon atom, such as C12 alcohol, C14 alcohol, C16 alcohol, C18 alcohol, C20 alcohol, C22 alcohol, C24 alcohol, C26 alcohol, C28 alcohol, and C30 alcohol; as well as mixed fatty alcohols containing different numbers of carbon atoms, such as C12-18 mixed alcohol, C16-18 mixed alcohol, and C16-22 mixed alcohol, one or more of which can be selected. The amount of the fatty alcohol used accounts for 10-20% of the total amount of the emulsion.

[0012] B. Paraffin

[0013] The paraffin wax is a hydrocarbon extracted from petroleum, shale oil or other asphalt mineral oil, and is selected from microcrystalline paraffin and liquid paraffin. The amount of paraffin wax used accounts for 2-8% of the total amount of the emulsion.

[0014] C. Grease

[0015] The oil is selected from one or more of rapeseed oil, peanut oil, soybean oil, coconut oil, palm oil, castor oil, olive oil, and butter. The amount of oil used accounts for 2-8% of the total amount of the emulsion. D. Modified silicon dioxide

[0016] The modified silica is obtained by surface-modifying silica with a silane coupling agent, and the amount of the modified silica accounts for 2-6% of the total amount of the emulsion;

[0017] The modified silica preparation method comprises the following steps: adding a silane coupling agent and water into a reaction container, adjusting the pH value to between 4 and 6 with an acid, stirring evenly, adding silica and a solvent, stirring at a high speed of 1000 to 2000 r / min for 2 to 5 minutes, filtering and drying to obtain the modified silica; wherein the silane coupling agent is selected from KH550, KH560, KH570, KH580, and KH590; the silica is hydrophobic silica selected from precipitated hydrophobic silica and vapor-phase hydrophobic silica; the amount of the silane coupling agent used accounts for 0.5 to 2% of the total mass of the silica; the acid is selected from acetic acid, oxalic acid, phosphoric acid, and silicic acid; and the solvent is selected from acetone, ketone, ethanol, cyclohexane water, and the amount of the acetone solvent is sufficient for the reaction.

[0018] E. Nonionic surfactant

[0019] The nonionic surfactant is obtained by compounding surfactant M and surfactant N; wherein: the structural formula of nonionic surfactant M is: R1O(EO) m H, where R1 is C 8-28alkyl, m is an integer of 10-60; the nonionic surfactant N is selected from one or more of polyoxyethylene sorbitan monostearate (Tween60), polyoxyethylene sorbitan monooleate (Tween80), polyoxyethylene sorbitan trioleate (Tween85), sorbitan monolaurate (Span20), sorbitan monopalmitate (Span40), sorbitan monostearate (Span60), glyceryl tristearate, glyceryl monostearate, pentaerythritol stearate, ethylene glycol monostearate, ethylene glycol distearate, diethylene glycol monostearate, and diethylene glycol distearate;

[0020] The amount of the nonionic surfactant accounts for 2-10% of the total mass of the emulsion; wherein the amount of the nonionic surfactant M accounts for 50-90% of the total mass of the nonionic surfactant.

[0021] F. Acrylate polymer

[0022] The amount of the acrylic ester polymer is 2-5% of the total amount of the emulsion.

[0023] The preparation method of the acrylate polymer comprises the following steps: adding different types of acrylate monomers into a reaction container, adding a benzoyl peroxide catalyst dropwise while stirring, and reacting at a temperature of 60-100° C. for 2-8 hours to obtain the acrylate polymer; the acrylate monomers are selected from two or more of hydroxyethyl acrylate, methyl acrylate, ethyl acrylate, butyl acrylate, lauryl acrylate, octadecyl acrylate, and isooctyl acrylate, and the mixture is selected in any proportion; and the amount of the catalyst used accounts for 0.2-2% of the total mass of the acrylate monomers.

[0024] G. Water

[0025] In the present invention, the amount of water used accounts for 60-75% of the total amount of the emulsion; the water is used in two parts, and G1 accounts for 10-30% of the total mass of the water.

[0026] A preparation method of a stable fatty alcohol emulsion defoamer is as follows:

[0027] (1) Modified silica D and water G1 are mixed and stirred to obtain a dispersion H;

[0028] (2) Mixing acrylic acid polymer F, nonionic surfactant M, and nonionic surfactant N and stirring them uniformly to form a mixture I;

[0029] (3) Fatty alcohol A, paraffin B, and oil C are mixed and heated to 70-90°C to melt and stir evenly, and mixture I is added thereto, and the mixture is kept warm and stirred evenly to obtain mixture J;

[0030] (4) Keep the mixture warm and continue adding the dispersion H to the mixture J. After stirring evenly, continue adding the remaining amount of water G2. After stirring evenly, cool to room temperature to form an emulsion. DETAILED DESCRIPTION

[0031] Examples of modified silica

[0032] Acrylate polymer examples and comparative examples

[0033] Fatty alcohol emulsion defoamer embodiment

[0034] Example 1

[0035] (1) 5 g of modified silica D1 and 6 g of water were mixed and stirred to obtain a dispersion H1;

[0036] (2) 2g acrylic acid polymer F1, 5g nonionic surfactant C8H 17 O(EO) 60 H. 5 g of a mixture of nonionic surfactants Tween 60 and Span 60 were mixed and stirred to form a mixture I1;

[0037] (3) a mixture of 10 g of C12-18 mixed alcohol, 5 g of microcrystalline paraffin, 8 g of rapeseed oil, and peanut oil was heated to 70° C. and melted and stirred uniformly, and mixture I1 was added thereto, and the mixture was kept warm and stirred uniformly to obtain mixture J1;

[0038] (4) Keep warm and continue to add dispersion H1 to mixture J1. After stirring evenly, continue to add the remaining 54g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0039] Example 2

[0040] (1) 2 g of modified silica D2 and 8 g of water were mixed and stirred to obtain a dispersion H2;

[0041] (2) 5g of acrylic acid polymer F2, 4.8g of nonionic surfactant C 15 H 31 O(EO) 40 H, 3.2 g of a nonionic surfactant Tween 80 and glyceryl tristearate were mixed and stirred to form a mixture I2;

[0042] (3) A mixture of 20 g of C16-18 mixed alcohol, 2 g of liquid paraffin, 2 g of soybean oil, and coconut oil was heated to 80° C. and melted and stirred uniformly, and mixture I2 was added thereto, and the mixture was kept warm and stirred uniformly to obtain mixture J2;

[0043] (4) Keep warm and continue to add dispersion H2 to mixture J2. After stirring evenly, continue to add the remaining 53g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0044] Example 3

[0045] (1) 3 g of modified silica D3 and 15 g of water were mixed and stirred to obtain a dispersion H3;

[0046] (2) 3g of acrylic acid polymer F3, 4.2g of nonionic surfactant C 20 H 41 O(EO) 20 H, 1.8g of a mixture of glyceryl monostearate and pentaerythritol stearate, a nonionic surfactant, were mixed and stirred to form a mixture I3;

[0047] (3) A mixture of 14 g of C16-22 mixed alcohol, 6 g of microcrystalline paraffin, 4 g of castor oil, and olive oil was heated to 90° C. and melted and stirred uniformly, and mixture I3 was added thereto, and the mixture was kept warm and stirred uniformly to obtain mixture J3;

[0048] (4) Keep warm and continue to add dispersion H3 to mixture J3. After stirring evenly, continue to add the remaining 49g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0049] Example 4

[0050] (1) 6 g of modified silica D4 and 19 g of water were mixed and stirred to obtain a dispersion H4;

[0051] (2) 4 g of acrylic acid polymer F4, 1.6 g of nonionic surfactant C 25 H 51 O(EO) 10 H and 0.4 g of ethylene glycol monostearate, a nonionic surfactant, were mixed and stirred to form a mixture I4;

[0052] (3) 11 g of a mixture of C18 and C12 alcohols, 8 g of liquid paraffin, and 3 g of soybean oil were mixed and heated to 75° C. to melt and stir uniformly, and mixture I4 was added thereto. The mixture was kept warm and stirred uniformly to obtain mixture J4;

[0053] (4) Keep warm and continue to add dispersion H4 to mixture J4. After stirring evenly, continue to add the remaining 47g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0054] Example 5

[0055] (1) 2 g of modified silica D5 and 22.5 g of water were mixed and stirred to obtain dispersion H5;

[0056] (2) 2 g of acrylic acid polymer F5, 2.7 g of nonionic surfactant C 28 H 57 O(EO) 30 H, 0.3g of a mixture of ethylene glycol distearate and diethylene glycol monostearate, a nonionic surfactant, were mixed and stirred to form a mixture I5;

[0057] (3) 13 g of a mixture of C30 alcohol and C28 alcohol, 2 g of microcrystalline paraffin, and 3 g of a mixture of palm oil and tallow were mixed and heated to 85° C. to melt and stir uniformly, and mixture I5 ​​was added thereto. The mixture was kept warm and stirred uniformly to obtain mixture J5;

[0058] (4) Keep warm and continue to add dispersion H5 to mixture J5. After stirring evenly, continue to add the remaining 52.5 g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0059] Example 6

[0060] (1) 3 g of modified silica D1 and 14 g of water were mixed and stirred to obtain dispersion H6;

[0061] (2) 3g of acrylic acid polymer F1, 2g of nonionic surfactant C 12 H 25 O(EO) 15 H, 2g of a mixture of nonionic surfactants Span20, Span40 and Tween85 were mixed and stirred to form a mixture I6;

[0062] (3) 13 g of a mixture of C12 alcohol and C14 alcohol, 3 g of microcrystalline paraffin, and 4 g of castor oil were mixed and heated to 80° C., melted and stirred uniformly, and mixture I6 was added thereto. The mixture was kept warm and stirred uniformly to obtain mixture J6;

[0063] (4) Keep warm and continue to add dispersion H6 to mixture J6. After stirring evenly, continue to add the remaining 56g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0064] Comparative Example 1-Comparison with Example 1, using modified silica

[0065] (1) 5 g of unmodified silica and 6 g of water were mixed and stirred to obtain dispersion H7;

[0066] (2) 2g acrylic acid polymer F1, 5g nonionic surfactant C8H 17 O(EO) 60 H. 5 g of a mixture of nonionic surfactants Tween 60 and Span 60 were mixed and stirred to form a mixture I1;

[0067] (3) a mixture of 10 g of C12-18 mixed alcohol, 5 g of microcrystalline paraffin, 8 g of rapeseed oil, and peanut oil was heated to 70° C. and melted and stirred uniformly, and mixture I1 was added thereto, and the mixture was kept warm and stirred uniformly to obtain mixture J1;

[0068] (4) Keep warm and continue to add dispersion H7 to mixture J1. After stirring evenly, continue to add the remaining 54g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0069] Comparative Example 2 - Comparison with Example 2, without using silicon dioxide

[0070] (1) 5g of acrylic acid polymer F2, 4.8g of nonionic surfactant C 15 H 31 O(EO) 40 H, 3.2 g of a nonionic surfactant Tween 80 and glyceryl tristearate were mixed and stirred to form a mixture I2;

[0071] (2) A mixture of 22 g of C16-18 mixed alcohol, 2 g of liquid paraffin, 2 g of soybean oil, and coconut oil was heated to 80°C and melted and stirred uniformly, and mixture I2 was added thereto, and the mixture was kept warm and stirred uniformly to obtain mixture J7;

[0072] (3) Keep warm and continue to add 61 g of water to the mixture J7. Stir evenly and then cool to room temperature to form an emulsion.

[0073] Comparative Example 3 - Example 3, removing the acrylic acid polymer

[0074] (1) 3 g of modified silica D3 and 15 g of water were mixed and stirred to obtain a dispersion H3;

[0075] (2) 6.2g nonionic surfactant C 20 H 41 O(EO) 20 H, 2.8g of a mixture of glyceryl monostearate and pentaerythritol stearate, a nonionic surfactant, were mixed and stirred to form a mixture I7;

[0076] (3) A mixture of 14 g of C16-22 mixed alcohol, 6 g of microcrystalline paraffin, 4 g of castor oil, and olive oil was heated to 90° C. and melted and stirred uniformly. Mixture I7 was added thereto, and the mixture was kept warm and stirred uniformly to obtain mixture J8;

[0077] (4) Keep warm and continue to add dispersion H3 to mixture J8. After stirring evenly, continue to add the remaining 49g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0078] Comparative Example 4-Comparison with Example 4, removing surfactant M

[0079] (1) 6 g of modified silica D4 and 19 g of water were mixed and stirred to obtain a dispersion H4;

[0080] (2) 4 g of acrylic polymer F4 and 2 g of nonionic surfactant ethylene glycol monostearate were mixed and stirred to form a mixture I8;

[0081] (3) 11 g of a mixture of C18 and C12 alcohols, 8 g of liquid paraffin, and 3 g of soybean oil were mixed and heated to 75° C. to melt and stir uniformly, and mixture I8 was added thereto. The mixture was kept warm and stirred uniformly to obtain mixture J9;

[0082] (4) Keep warm and continue to add dispersion H4 to mixture J9. After stirring evenly, continue to add the remaining 47g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0083] Comparative Example 5-Comparison with Example 5, removing surfactant N

[0084] (1) 2 g of modified silica D5 and 22.5 g of water were mixed and stirred to obtain dispersion H5;

[0085] (2) 2g of acrylic acid polymer F5, 3g of nonionic surfactant C 28 H 57 O(EO) 30 H mixed and stirred evenly to form a mixture I9;

[0086] (3) 13 g of a mixture of C30 alcohol and C28 alcohol, 2 g of microcrystalline paraffin, and 3 g of a mixture of palm oil and tallow were mixed and heated to 85° C. to melt and stir uniformly, and mixture I9 was added thereto. The mixture was kept warm and stirred uniformly to obtain mixture J10;

[0087] (4) Keep warm and continue to add dispersion H5 to mixture J10. After stirring evenly, continue to add the remaining 52.5 g of water. After stirring evenly, cool to room temperature to form an emulsion.

[0088] Performance Testing

[0089] 1. Emulsion stability test

[0090] The emulsions prepared in the above examples and comparative examples were subjected to six-month viscosity tracking tests at 5°C, 25°C, and 40°C. Viscosity was measured using an NDJ-8 digital viscometer with a #2 rotor at 6 rpm. The specific results are shown in Table 1 below (viscosity measured in mPa.s; a "-" indicates the emulsion is a paste and cannot flow):

[0091] Table 1 Changes in emulsion viscosity at different storage temperatures

[0092] Viscosity tracking test data shows that the defoamer emulsions prepared in the present invention exhibit minimal viscosity changes after six months of storage at 5°C, 25°C, and 40°C, demonstrating good storage stability. In contrast, the viscosities of the fatty alcohol emulsions prepared in Comparative Examples 1-5 all increased to varying degrees after six months.

[0093] 2. Test method for foam suppression performance:

[0094] The performance of the defoaming agent is determined by the circulating bubbling method. 600 ml of white water is added to the circulating bubbling device and heated to the required temperature. The flow pump is turned on and circulated at a flow rate of 8 / L min to a foam volume of 300 ml. 6 μl of defoaming agent is added and the change in foam volume over time is recorded. Within the same time, the smaller the volume, the better the defoaming and antifoaming performance; the longer the time for the foam to reach 300 ml again, the better the antifoaming performance.

[0095] The fatty alcohol emulsion prepared by the invention exhibits good foam elimination and suppression performance at 30° C. and 55° C.

Claims

1. A method for preparing a stable fatty alcohol emulsion, comprising the following components: A. Fatty alcohol The fatty alcohol is a monohydric to trihydric alcohol of C12-C30, selected from one or a mixture of synthetic fatty alcohols and natural fatty alcohols; the synthetic fatty alcohol can be obtained by oxidation of alkyl aluminum by the Ziegler method, or by carbonyl synthesis; the natural fatty alcohol can be obtained by extraction from oils and fats; specifically, the fatty alcohol includes fatty alcohols containing a single carbon atom, such as C12 alcohol, C14 alcohol, C16 alcohol, C18 alcohol, C20 alcohol, C22 alcohol, C24 alcohol, C26 alcohol, C28 alcohol, C30 alcohol; and mixed fatty alcohols containing different numbers of carbon atoms, such as C12-18 mixed alcohol, C16-18 mixed alcohol, C16-22 mixed alcohol, one or more of which are selected; the amount of fatty alcohol used accounts for 10-20% of the total amount of the emulsion; B. Paraffin The paraffin is a hydrocarbon extracted from petroleum, shale oil or other asphalt mineral oil, selected from microcrystalline paraffin and liquid paraffin; the amount of paraffin accounts for 2-8% of the total amount of the emulsion; C. Grease The oil is selected from one or more of rapeseed oil, peanut oil, soybean oil, coconut oil, palm oil, castor oil, olive oil and butter; the amount of the oil accounts for 2-8% of the total amount of the emulsion; D. Modified silica The modified silicon dioxide is obtained by surface-modifying silicon dioxide with a silane coupling agent, and the amount of the modified silicon dioxide accounts for 2-6% of the total amount of the emulsion; E. Nonionic surfactant The nonionic surfactant is obtained by compounding surfactant M and surfactant N; wherein the structural formula of nonionic surfactant M is: R1O(EO) m H, where R1 is C 8-28 alkyl, m is an integer of 10-60; the nonionic surfactant N is selected from one or more of polyoxyethylene sorbitan monostearate (Tween60), polyoxyethylene sorbitan monooleate (Tween80), polyoxyethylene sorbitan trioleate (Tween85), sorbitan monolaurate (Span20), sorbitan monopalmitate (Span40), sorbitan monostearate (Span60), tristearic acid glyceryl, monostearic acid glyceryl, pentaerythritol stearic acid glyceryl, ethylene glycol monostearate, ethylene glycol distearate, diethylene glycol monostearate, and diethylene glycol distearate; the amount of the nonionic surfactant is 2-10% of the total amount of the emulsion; F, acrylate polymer, the acrylate polymer is used in an amount of 2-5% of the total amount of the emulsion; G. Water The amount of water used accounts for 60-75% of the total amount of the emulsion; the water is used in two parts, G1 and G2; A method for preparing a stable fatty alcohol emulsion defoamer is as follows: (1) Mixing and stirring the modified silicon dioxide D and water G1 to obtain a dispersion H; (2) mixing and stirring the acrylic acid polymer F, the nonionic surfactant M, and the nonionic surfactant N to form a mixture I; (3) mixing fatty alcohol A, paraffin B, and oil C, heating to 70-90° C. to melt and stir evenly, adding mixture I thereto, and continuing to stir evenly while keeping the temperature, to obtain mixture J; (4) Keep the mixture warm and continue to add the dispersion H to the mixture J. After stirring evenly, continue to add the remaining amount of water G2. After stirring evenly, cool to room temperature to form an emulsion.

2. The method for preparing a stable fatty alcohol emulsion defoamer according to claim 1, characterized in that: The preparation method of the modified silicon dioxide is as follows: adding a silane coupling agent and water into a reaction container, adjusting the pH value to between 4 and 6 with an acid, stirring evenly, adding silicon dioxide and a solvent, stirring at a high speed of 1000-2000 r / min for 2-5 minutes, filtering and drying to obtain the modified silicon dioxide; wherein the silane coupling agent is selected from KH550, KH560, KH570, KH580, and KH590; the silicon dioxide is hydrophobic silicon dioxide selected from precipitation method hydrophobic silicon dioxide and gas phase method hydrophobic silicon dioxide; the amount of the silane coupling agent accounts for 0.5-2% of the total mass of the silicon dioxide; the acid is selected from acetic acid, oxalic acid, phosphoric acid, and silicic acid; the solvent is selected from acetone, ketone, ethanol, cyclohexane water, and the amount of the acetone solvent is sufficient for the reaction.

3. The method for preparing a stable fatty alcohol emulsion defoamer according to claim 1, characterized in that: The amount of the nonionic surfactant M accounts for 50-90% of the total mass of the nonionic surfactant.

4. The method for preparing a stable fatty alcohol emulsion defoamer according to claim 1, characterized in that: The preparation method of the acrylate polymer comprises the following steps: adding different types of acrylate monomers into a reaction container, adding a benzoyl peroxide catalyst dropwise while stirring, and reacting for 2-8 hours at a temperature of 60-100° C.; the acrylate monomers are selected from two or more of hydroxyethyl acrylate, methyl acrylate, ethyl acrylate, butyl acrylate, lauryl acrylate, octadecyl acrylate, and isooctyl acrylate, and the mixture is selected in any proportion; and the amount of the catalyst used accounts for 0.2-2% of the total mass of the acrylate monomers.

5. The method for preparing a stable fatty alcohol emulsion defoamer according to claim 1, characterized in that: Water G1 accounts for 10-30% of the total mass of water.

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