Composite emulsifier and method for preparing the same

Abstract

This invention relates to the field of pesticide adjuvant technology, and proposes a composite emulsifier and its preparation method. A composite emulsifier comprises the following components in parts by weight: 25-35 parts of a nonionic surfactant, 25-35 parts of anionic surfactant, 5-10 parts of a pH adjuster, 1-3 parts of a defoamer, and 20-30 parts of a solvent; the nonionic surfactant includes secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether, and cashew nut phenol polyoxyethylene ether. This technical solution solves the problem of insufficient low-foaming and rapid defoaming performance of existing composite emulsifiers.

Description

Technical Field

[0001] This invention relates to the field of pesticide adjuvant technology, specifically to a composite emulsifier and its preparation method. Background Technology

[0002] Emulsifiers, as an important class of functional additives, are widely used in many fields such as chemical industry, daily chemical industry, food industry, and pesticide industry. They can effectively improve the compatibility of oil-water system and enable two immiscible phases to form a stable dispersion system.

[0003] In the pesticide formulation processing industry, the performance of emulsifiers directly determines the application effect and storage stability of the formulation. Currently, while commercially available pesticide emulsifiers can basically meet basic emulsification needs, some emulsifiers contain components that do not conform to the green and environmentally friendly industry development trend. At the same time, existing compound emulsifiers suffer from insufficient low-foaming and rapid defoaming properties. During the mixing and shearing processes in pesticide formulation production, large amounts of stable foam are easily generated. Foam residue not only leads to component aggregation and precipitation causing equipment blockage, but also reduces the emulsification and dispersion effect, affecting production continuity and the final quality of the pesticide. Therefore, there is a need to develop a new type of pesticide compound emulsifier with low foaming and rapid defoaming properties. Summary of the Invention

[0004] This invention proposes a composite emulsifier and its preparation method, which solves the problem of insufficient low-foaming and fast defoaming performance of composite emulsifiers in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a composite emulsifier comprising the following components in parts by weight: 25-35 parts of nonionic surfactant, 25-35 parts of anionic surfactant, 5-10 parts of pH adjuster, 1-3 parts of defoamer, and 20-30 parts of solvent. The nonionic surfactants include secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether, and cashew phenol polyoxyethylene ether.

[0006] As a further technical solution, the mass ratio of the secondary alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether, and cashew phenol polyoxyethylene ether is 1:1:0.4~0.5.

[0007] In this invention, when the mass ratio of secondary alcohol polyoxyethylene ether, isotretinoin polyoxyethylene ether, and cashew nut phenol polyoxyethylene ether is 1:1:0.4~0.5, the synergistic effect of the three can further improve the low-foaming and fast defoaming performance of the composite emulsifier. When the proportion of cashew nut phenol polyoxyethylene ether is relatively high, it will lead to an increase in the viscosity of the system, slow down the foam breaking rate, and weaken the rapid defoaming effect of isotretinoin polyoxyethylene ether. When the proportion of cashew nut phenol polyoxyethylene ether is relatively low, its auxiliary role in inhibiting foam rebound cannot be fully realized.

[0008] As a further technical solution, the anionic surfactant includes one or two of sodium ditridecyl sulfosuccinate, fatty alcohol polyoxyethylene ether phosphate, disodium isodecyl sulfosuccinate, and alkylphenol polyoxyethylene ether phosphate.

[0009] As a further technical solution, when the anionic surfactant is sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate, the mass ratio of sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate is 1:1~1.5.

[0010] In this invention, when the anionic surfactants sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate are used in combination, their synergistic effect further enhances the thermal storage stability of the composite emulsifier. Sodium ditridecyl sulfosuccinate contains long hydrophobic chains, while disodium isodecyl sulfosuccinate contains short hydrophobic chains. Under thermal storage conditions, the long-chain hydrophobic groups can inhibit molecular thermal motion, while the short-chain groups alleviate the aggregation of long-chain molecules, jointly reducing the critical micelle concentration of the mixed system, enhancing the structural stability of the micelles, and reducing thermal decomposition. Furthermore, the high structural matching between the two enhances their synergistic optimization of interfacial tension reduction, resulting in a denser and tougher interfacial film that effectively resists the damage of high temperatures to the emulsification system, thereby significantly improving the thermal storage stability of the composite emulsifier.

[0011] As a further technical solution, the mass ratio of sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate is 1:1.2.

[0012] In this invention, when the mass ratio of sodium ditridecyl sulfosuccinate to disodium isodecyl sulfosuccinate is 1:1.2, the synergistic effect on improving the thermal storage stability of the composite emulsifier is better. When the proportion of disodium isodecyl sulfosuccinate is high, the inhibition of molecular thermal motion by long-chain hydrophobic groups is weakened. When the proportion of disodium isodecyl sulfosuccinate is low, long-chain molecules are prone to agglomeration, which ultimately weakens the effect of improving the thermal storage stability of the composite emulsifier.

[0013] As a further technical solution, the pH adjuster includes one or more of monoethanolamine, diethanolamine, and triethanolamine.

[0014] As a further technical solution, the defoamer includes polyether-based defoamers.

[0015] As a further technical solution, the solvent includes water.

[0016] This invention also proposes a method for preparing a composite emulsifier, comprising the following steps: The solvent and nonionic surfactant are mixed for the first time, and then anionic surfactant is added for the second mixing. The mixture is cooled to 30-40°C, and then pH adjuster and defoamer are added to obtain the composite emulsifier.

[0017] As a further technical solution, the temperatures of the first mixing and the second mixing are each independently 70~80℃.

[0018] As a further technical solution, the rotation speed of the first mixing is 300~400 rpm, and the time is 15~20 min.

[0019] As a further technical solution, the rotation speed of the second mixing is 3000~4000 rpm, and the time is 5~10 min.

[0020] The working principle and beneficial effects of this invention are as follows: In this invention, a combination of secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether, and cashew nut phenol polyoxyethylene ether is added as a nonionic surfactant to a composite emulsifier, enabling the composite emulsifier to possess both excellent low-foaming performance and rapid defoaming ability. The steric hindrance effect of secondary alcohol polyoxyethylene ether inhibits foam formation while providing basic emulsification and wetting penetration capabilities, laying the foundation for a low-foaming system. The branched structure of isotridecyl alcohol polyoxyethylene ether disrupts foam film stability while enhancing emulsification and dispersion effects and system compatibility. Cashew nut phenol polyoxyethylene ether improves high-temperature and hard water resistance, helps suppress foam rebound, and enhances viscosity stability. When these three components work synergistically, they reduce the formation of stable foam and accelerate the foam collapse rate, resulting in a composite emulsifier with both low-foaming and rapid defoaming properties. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] In the following examples and comparative examples, the following components are used: secondary alcohol polyoxyethylene ether: model S-90; isomeric tridecyl alcohol polyoxyethylene ether: model E-1308; cashew phenol polyoxyethylene ether: model BGF-10; fatty alcohol polyoxyethylene ether phosphate: model AEO-3P; alkylphenol polyoxyethylene ether phosphate: model APE-10P; polyether defoamer: model GP330; isomeric decadecyl alcohol polyoxyethylene ether: model E-1006; and fatty alcohol polyoxyethylene ether: model AEO-9.

[0023] Example 1 A composite emulsifier comprises the following components in parts by weight: 25 parts of nonionic surfactant, 25 parts of anionic surfactant, 5 parts of monoethanolamine, 1 part of polyether defoamer, and 20 parts of water. The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.3. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 70°C and 400 rpm for 15 min, then anionic surfactant was added and stirred at 70°C and 4000 rpm for 5 min. The mixture was then cooled to 30°C, and monoethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0024] Example 2 A composite emulsifier comprises the following components in parts by weight: 35 parts of nonionic surfactant, 35 parts of anionic surfactant, 10 parts of diethanolamine, 3 parts of polyether defoamer, and 30 parts of water. The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.3. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 80°C and 300 rpm for 20 min, then anionic surfactant was added and stirred at 80°C and 3000 rpm for 10 min. The mixture was then cooled to 40°C, and diethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0025] Example 3 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.3. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0026] Example 4 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.4. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0027] Example 5 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.5. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0028] Example 6 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.6. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0029] Example 7 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.5. The anionic surfactant is sodium ditridecyl sulfosuccinate and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:1. A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0030] Example 8 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.5. The anionic surfactant is sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate in a mass ratio of 1:1. A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0031] Example 9 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.5. The anionic surfactant is sodium ditridecyl sulfosuccinate and alkylphenol polyoxyethylene ether phosphate in a mass ratio of 1:1. A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0032] Example 10 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.5. The anionic surfactant is sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate in a mass ratio of 1:1.2. A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0033] Example 11 A composite emulsifier comprises the following components in parts by weight: 30 parts of nonionic surfactant, 30 parts of anionic surfactant, 8 parts of triethanolamine, 2 parts of polyether defoamer, and 25 parts of water; The nonionic surfactants are secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.5. The anionic surfactant is sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate in a mass ratio of 1:1.5. A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 75°C and 350 rpm for 15 min, then anionic surfactant was added and stirred at 75°C and 3500 rpm for 8 min. The mixture was then cooled to 35°C, and triethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0034] Comparative Example 1 A composite emulsifier comprises the following components in parts by weight: 35 parts of nonionic surfactant, 35 parts of anionic surfactant, 10 parts of diethanolamine, 3 parts of polyether defoamer, and 30 parts of water. The nonionic surfactants are secondary alcohol polyoxyethylene ether, isomeric decaol polyoxyethylene ether, and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.3. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 80°C and 300 rpm for 20 min, then anionic surfactant was added and stirred at 80°C and 3000 rpm for 10 min. The mixture was then cooled to 40°C, and diethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0035] Comparative Example 2 A composite emulsifier comprises the following components in parts by weight: 35 parts of nonionic surfactant, 35 parts of anionic surfactant, 10 parts of diethanolamine, 3 parts of polyether defoamer, and 30 parts of water. The nonionic surfactants are fatty alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:1:0.3. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 80°C and 300 rpm for 20 min, then anionic surfactant was added and stirred at 80°C and 3000 rpm for 10 min. The mixture was then cooled to 40°C, and diethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0036] Comparative Example 3 A composite emulsifier comprises the following components in parts by weight: 35 parts of nonionic surfactant, 35 parts of anionic surfactant, 10 parts of diethanolamine, 3 parts of polyether defoamer, and 30 parts of water. The nonionic surfactant is a mixture of secondary alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:0.3; The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 80°C and 300 rpm for 20 min, then anionic surfactant was added and stirred at 80°C and 3000 rpm for 10 min. The mixture was then cooled to 40°C, and diethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0037] Comparative Example 4 A composite emulsifier comprises the following components in parts by weight: 35 parts of nonionic surfactant, 35 parts of anionic surfactant, 10 parts of diethanolamine, 3 parts of polyether defoamer, and 30 parts of water. The nonionic surfactant is a mixture of secondary alcohol polyoxyethylene ether and isomeric tridecyl alcohol polyoxyethylene ether in a mass ratio of 1:1. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 80°C and 300 rpm for 20 min, then anionic surfactant was added and stirred at 80°C and 3000 rpm for 10 min. The mixture was then cooled to 40°C, and diethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0038] Comparative Example 5 A composite emulsifier comprises the following components in parts by weight: 35 parts of nonionic surfactant, 35 parts of anionic surfactant, 10 parts of diethanolamine, 3 parts of polyether defoamer, and 30 parts of water. The nonionic surfactant is a mixture of isotridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether in a mass ratio of 1:0.3. The anionic surfactant is sodium ditridecyl sulfosuccinate; A composite emulsifier includes the following steps: Water and nonionic surfactant were mixed at 80°C and 300 rpm for 20 min, then anionic surfactant was added and stirred at 80°C and 3000 rpm for 10 min. The mixture was then cooled to 40°C, and diethanolamine and polyether defoamer were added to obtain a composite emulsifier.

[0039] Experimental Example 1 The composite emulsifiers prepared in Examples 1-6 and Comparative Examples 1-5 were each prepared into 3 g / L composite emulsifier samples using distilled water. Their foaming properties were tested according to the method specified in GB / T 7462-1994 "Determination of Foaming Power of Surfactants - Modified Ross-Miles Method". The test results are shown in Table 1. Table 1. Performance test results of the composite emulsifiers prepared in Examples 1-6 and Comparative Examples 1-5

[0040] 1. Compared with Comparative Examples 1-5, the initial bubble height (30s) of the composite emulsifiers prepared in Examples 1-6 was only 26-36mm, and the bubble height dropped to 5-12mm after 5min, which was significantly lower than that in Comparative Examples 1-5. This indicates that the combined use of secondary alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether and cashew phenol polyoxyethylene ether as nonionic surfactants can improve the low-foaming and fast defoaming performance of the composite emulsifier.

[0041] 2. Compared with Examples 3 to 6, the bubble heights of the composite emulsifiers prepared in Examples 4 to 5 at 30s, 3min, and 5min are all lower than those in Examples 3 and 5. This indicates that further limiting the mass ratio of secondary alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether, and cashew phenol polyoxyethylene ether to 1:1:0.4~0.5 can further improve the low-foaming and fast defoaming performance of the composite emulsifier.

[0042] Experiment Example 2 The composite emulsifiers prepared in Examples 5 and 7-11 were added to the pesticide, and water was added to obtain pesticide solution (the pesticide solution contained 10% by mass of composite emulsifier, 2% by mass of pesticide, and the remainder being water). The thermal storage stability was tested according to the method specified in GB / T19136-2021 "Determination of Thermal Storage Stability of Pesticides". The test results are shown in Table 2. Table 2 Performance test results of the composite emulsifiers prepared in Examples 5 and 7-11

[0043] 1. Compared with Examples 7-11, the heat storage precipitation rate of the composite emulsifiers prepared in Examples 7-11 was lower than that in Example 5, indicating that the heat storage stability of the composite emulsifier was better when two anionic surfactants were used in combination. The heat storage precipitation rate of the composite emulsifiers prepared in Examples 8 and 10-11 was lower than that in Examples 7 and 9, indicating that the heat storage stability of the composite emulsifier was further improved when sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate were used in combination.

[0044] 2. Compared with Examples 8 and 10-11, the thermal storage precipitation rate of the composite emulsifier prepared in Example 10 was as low as 3.2%, indicating that the thermal storage stability of the composite emulsifier was optimal when the mass ratio of sodium ditridecyl sulfosuccinate to disodium isodecyl sulfosuccinate was 1:1.2.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite emulsifier, characterized in that, It includes the following components in parts by weight: 25-35 parts of nonionic surfactant, 25-35 parts of anionic surfactant, 5-10 parts of pH adjuster, 1-3 parts of defoamer, and 20-30 parts of solvent; The nonionic surfactants include secondary alcohol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether, and cashew phenol polyoxyethylene ether.

2. The composite emulsifier according to claim 1, characterized in that, The mass ratio of the secondary alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether, and cashew phenol polyoxyethylene ether is 1:1:0.4~0.

5.

3. The composite emulsifier according to claim 1, characterized in that, The anionic surfactant includes one or two of sodium ditridecyl sulfosuccinate, fatty alcohol polyoxyethylene ether phosphate, disodium isodecyl sulfosuccinate, and alkylphenol polyoxyethylene ether phosphate.

4. The composite emulsifier according to claim 3, characterized in that, When the anionic surfactant is sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate, the mass ratio of sodium ditridecyl sulfosuccinate to disodium isodecyl sulfosuccinate is 1:1 to 1.

5.

5. A composite emulsifier according to claim 4, characterized in that, The mass ratio of sodium ditridecyl sulfosuccinate and disodium isodecyl sulfosuccinate is 1:1.

2.

6. The composite emulsifier according to claim 1, characterized in that, The pH adjuster includes one or more of monoethanolamine, diethanolamine, and triethanolamine.

7. The composite emulsifier according to claim 1, characterized in that, The defoamer includes polyether defoamers.

8. The composite emulsifier according to claim 1, characterized in that, The solvent includes water.

9. A method for preparing a composite emulsifier, used to prepare the composite emulsifier according to any one of claims 1 to 8, characterized in that, Includes the following steps: The solvent and nonionic surfactant are mixed for the first time, and then anionic surfactant is added for the second mixing. The mixture is cooled to 30-40°C, and then pH adjuster and defoamer are added to obtain the composite emulsifier.

10. The method for preparing a composite emulsifier according to claim 9, characterized in that, The temperatures for the first and second mixing processes are each independently 70-80°C.

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