Preparation method and application of sulfosuccinate surfactant

Abstract

The invention relates to the technical field of surfactants, and particularly discloses a preparation method and application of a sulfosuccinate type surfactant, and the preparation method specifically comprises the following steps: (1) esterification reaction: under the protection of inert gas, adding fatty alcohol and carboxylic acid anhydride, introducing gas for 10-20 minutes, adding a difunctional acidic site catalyst, heating to 95-105 DEG C, and reacting for 2-3 hours to obtain an esterification product; and (2) sulfonation reaction: cooling the esterification product to 70-80 DEG C, dropwise adding 20-40wt% of sulfonating agent aqueous solution, preserving heat for 1-2 hours after dropwise adding, and then performing post-treatment to obtain the sulfosuccinate type surfactant. In the preparation process, one-pot preparation is realized by regulating and controlling process conditions and developing a catalyst to efficiently catalyze esterification and sulfonation, intermediate products do not need to be separated between esterification and sulfonation, material loss caused by transfer and separation is avoided, the adopted catalyst can be used for inhibiting premature oxidation of a sulfur source in the sulfonation process, and the sulfonation efficiency is improved. The generation of byproducts is reduced, and the yield is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of surfactants, and particularly relates to a preparation method and application of a sulfosuccinate surfactant. BACKGROUND

[0002] Sulfosuccinate is an important anionic surfactant, which is famous for its excellent emulsifying, dispersing, wetting and foaming properties, low irritation and good biodegradability. Its basic structure is generally composed of one or more repeated succinic acid units combined with a terminal sulfate ion, which has amphiphilic properties and can be oriented and arranged at the interface to reduce surface tension.

[0003] The preparation process of sulfosuccinate surfactants is mainly based on the esterification-sulfonation two-step method. The traditional process such as patent application CN116621741A uses maleic anhydride to react with fatty alcohols to generate monoester or diester, and then reacts with sulfite (such as sodium sulfite) to introduce sulfonic acid groups. However, this process has relatively severe reaction conditions, requires high temperature and high pressure, and has many side reactions. In recent years, although the preparation process of sulfosuccinate surfactants has been continuously optimized, there are still some deficiencies: first, the problem of side reactions and product purity. During the sulfonation process, over-sulfonation or oxidation side reactions easily occur, resulting in deepening of color and increasing of impurities; second, the problem of raw materials and cost: the traditional fatty alcohols rely on petroleum resources and have high cost; finally, the problem of environmental protection and safety: the existing process may produce sulfur-containing wastewater or waste gas. Therefore, the present application aims to provide a preparation method of sulfosuccinate surfactants with improved reaction selectivity and reduced by-products. SUMMARY

[0004] In order to overcome the deficiencies of the prior art, the present application adjusts the process conditions and develops an efficient bifunctional acidic site catalyst as an improvement direction for the preparation process of sulfosuccinate surfactants, which can catalyze esterification reaction and promote sulfonation reaction to inhibit the premature oxidation of sulfur source in the sulfonation process and reduce the generation of by-products.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is: In one aspect, the present application provides a preparation method of sulfosuccinate surfactants, which specifically comprises the following steps: (1) Esterification reaction: under the protection of inert gas, fatty alcohol and carboxylic anhydride are added, and after aeration for 10-20 min, a bifunctional acidic site catalyst is added, and then the temperature is raised to 95-105°C for 2-3 h to obtain an esterification product; (2) sulfonating reaction: cooling the esterification product to 70-80 °C, adding 20-40 wt% sulfonating agent aqueous solution dropwise, after the dropwise addition is completed, keeping for 1-2 h, and then post-treatment is performed to obtain a sulfosuccinate surfactant.

[0006] In the preparation method, the fatty alcohol, the carboxylic anhydride and the catalyst are mixed to perform esterification reaction; then the sulfonating agent aqueous solution that is dissolved in advance is added to the system to perform sulfonating reaction, and the temperature is controlled to avoid too slow reaction rate or sulfonate decomposition and color deepening.

[0007] In some embodiments, in step (1), the amount of the bifunctional acidic site catalyst is 1.5-4.5 wt% of the total mass of the fatty alcohol and the carboxylic anhydride.

[0008] The solid heterogeneous catalyst provided by the application can be easily separated from the reaction solution by vacuum filtration, and the recovered catalyst can be regenerated and recycled after drying.

[0009] In some embodiments, in step (1), the bifunctional acidic site catalyst is prepared by the following steps: S1, dissolving a zirconium source and a cerium source in deionized water, then adding a template agent, stirring and homogenizing, and adjusting the pH to 8-9 to obtain a sol; S2, transferring the sol to a reaction kettle, hydrothermal reaction at 100-110 °C for 8-16 h, then keeping for 12-36 h, filtering and washing to obtain a solid product; S3, under the protection of an inert gas, heating the solid product to 350-390 °C at a rate of 4-12 °C / min, keeping for 0.5-1.5 h to obtain a porous oxide, refluxing the porous oxide with silane in toluene for 4-8 h, filtering and drying to obtain the bifunctional acidic site catalyst.

[0010] The catalyst provided by the application has bifunctional acidic sites, wherein Zr 4+ The Lewis acidity provides efficient catalysis of esterification reaction of alcohol and acid anhydride, and the Ce-OH provides Brønsted acidity to promote the sulfonating reaction. In addition, the Ce 3+ / Ce 4+ The redox pair of Zr

[0011] In some embodiments, in step S1, the molar ratio of the zirconium source to the cerium source is (2-5):1.

[0012] In some embodiments, in step S1, the template agent is 2-methyl-1H-imidazole-5-carboxylic acid.

[0013] 2-methyl-1H-imidazole-5-carboxylic acid has both carboxylate and tertiary nitrogen atom, which can form stable bidentate coordination with Zr 4+ and Ce 4+ to control the hydrolysis-condensation rate in hydrothermal process, and make the solid product form uniform mesoporous structure. In the pyrolysis process, 2-methyl-1H-imidazole-5-carboxylic acid will undergo an intermediate carbonization state, and the produced reducing carbonaceous intermediate can reduce part of Ce 4+ in situ to Ce 3+ , thereby directly constructing the required Ce 3+ / Ce 4+ redox pair.

[0014] In some embodiments, a lanthanum source is further added in step S1.

[0015] In some embodiments, the amount of the lanthanum source is 1-4 mol% of the total amount of the zirconium source and the cerium source.

[0016] The present application attempts to introduce a third metal lanthanum for doping. La 3+ has an ionic radius larger than Ce 4+ and Zr 4+ . After doping into the CeO2 lattice, it will cause lattice expansion and stress. In order to compensate the charge balance and release the stress, it will promote more Ce 4+ to be reduced to Ce 3+ , and stabilize Ce 3+ in the lattice to prevent it from being oxidized during the reaction or storage process. At the same time, the doping of lanthanum can effectively inhibit the phase transition and growth of ZrO2 grains during pyrolysis and use, so that the catalyst can maintain structural stability during cyclic use.

[0017] In some embodiments, in step S3, the silane is hexadecyltrimethoxysilane.

[0018] In some embodiments, the amount of the silane is 4-8 wt% of the porous oxide.

[0019] The long-chain alkyl group of hexadecyltrimethoxysilane can provide a strong hydrophobic layer, effectively preventing water molecules from approaching the active sites of the catalyst, and preventing the catalyst from being hydrolyzed and deactivated due to water absorption in the esterification reaction. In the reflux process, the methoxy group forms a firm covalent bond with the hydroxyl group on the surface of the porous oxide, and the obtained modified layer is relatively stable and not easy to fall off in the reaction. In addition, the introduction of the long-chain alkyl group also helps to enhance the lipophilicity of the catalyst, so that it has better dispersibility in the mixture of fatty alcohols and maleic anhydride.

[0020] In some embodiments, in step (1), the carbon chain length of the fatty alcohol is 6-14.

[0021] In some embodiments, the fatty alcohol in step (1) may also contain an ether bond.

[0022] In some embodiments, in step (1), the carboxylic anhydride is any one of acetic anhydride, maleic anhydride, phthalic anhydride, and succinic anhydride.

[0023] In some embodiments, during step (2), the pH of the reaction system is controlled to be 6.0 to 6.5 during the dropwise addition of the sulfonating agent aqueous solution.

[0024] Preferably, the sulfonating agent is sodium sulfite.

[0025] During the dropwise addition of sodium sulfite aqueous solution, SO3 2- H2O and HSO3 are reversibly converted to each other. - And OH-, the present invention controls the pH value of the reaction system to make the reaction system favorable for HSO3. - It attacks the alkene bond while simultaneously inhibiting the disproportionation of Na2SO3 to form SO2 and Na2SO4.

[0026] In some embodiments, in step (2), the post-processing specifically involves: after the heat preservation is completed, the reaction system is cooled to 40-50°C, vacuum filtered to obtain filter cake and filtrate, the filter cake is washed to obtain washing liquid, the washing liquid and filtrate are mixed and concentrated to obtain sulfosuccinate type surfactant.

[0027] Another aspect of the present invention provides the application of the sulfosuccinate-type surfactant obtained by the above preparation method in the agricultural emulsion and printing and dyeing industries.

[0028] In the field of agricultural emulsions, sulfosuccinate surfactants effectively reduce oil / water interfacial tension, emulsifying hydrophobic oily pesticide technicals into a uniform and stable emulsion, making it less prone to stratification and precipitation during dilution. Simultaneously, they significantly reduce the surface tension of the pesticide solution, allowing it to spread rapidly on plant leaves and insect surfaces instead of forming droplets. This strong wetting and penetrating ability helps the pesticide penetrate the waxy layer of plant leaves or the cuticle of insects, significantly increasing the adhesion and systemic translocation efficiency of the pesticide, thereby enhancing the control effect. Furthermore, the sulfonic acid groups have low sensitivity to hard water ions such as calcium and magnesium, maintaining good emulsification stability and activity even under hard water conditions, and are less prone to precipitation.

[0029] In the dyeing and printing industry, it can rapidly reduce surface tension, helping dye liquor, auxiliaries, or finishing agents to quickly penetrate into the fiber bundle, ensuring uniform and thorough dyeing and avoiding surface dyeing or unevenness. In dyeing liquor, it can adsorb onto the surface of dye particles, forming electrostatic repulsion and steric hindrance, effectively preventing dye aggregation or recrystallization, maintaining the stability of the dye liquor, and thus avoiding dyeing defects such as color spots and stains on fabrics. In addition, sulfosuccinate surfactants are easy to wash off, leave little residue on fabrics, and leave treated fabrics with a clean feel without any greasy residue.

[0030] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention improves the preparation method of sulfosuccinate surfactants by adjusting process conditions and developing efficient catalysts, realizing an advanced and simple one-pot process. Compared with traditional processes, this preparation method not only produces less waste, but also avoids material loss caused by transfer and separation by eliminating the need to separate intermediate products between esterification and sulfonation.

[0031] 2. The catalyst provided by this invention has bifunctional acidic sites. Through multi-metal synergy and surface modification, it can shorten the total reaction time of esterification-sulfonation, inhibit the premature oxidation of sulfur source during sulfonation, reduce the generation of by-products, and the catalyst is easy to filter and recover.

[0032] 3. The catalyst used in this invention is 2-methyl-1H-imidazol-5-carboxylic acid, which serves as a template agent to control the hydrolysis-condensation rate during the hydrothermal process, thereby forming a uniform mesoporous solid product. Furthermore, the reducing carbonaceous intermediates generated during pyrolysis are utilized to partially remove Ce. 4+ In-situ restoration to Ce 3+ Ce formed 3+ / Ce 4+ The redox reaction consumes dissolved oxygen in the reaction system, preventing the sulfonating agent sodium sulfite from being oxidized. The long-chain alkyl group of the hexadecyltrimethoxysilane used for surface modification provides a strong hydrophobic layer, which can prevent water molecules from approaching the active sites of the catalyst, preventing the catalyst from undergoing hydrolytic deactivation due to water absorption during the esterification reaction. Furthermore, the introduction of the long-chain alkyl group also helps to enhance the lipophilicity of the catalyst, making it more dispersible in mixtures of fatty alcohols and carboxylic anhydrides. Detailed Implementation

[0033] The present invention will be described below with reference to specific implementation schemes. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope. It is worth noting that, unless otherwise specified, the raw materials used in the following preparation examples and embodiments can be obtained from any commercially available manufacturer.

[0034] Preparation Example 1 The preparation steps of bifunctional acidic site catalyst A are as follows: S1. Dissolve 0.4 mol ZrOCl2·8H2O, 0.1 mol (NH4)2Ce(NO3)6, and 15 mmol La(NO3)3·6H2O in 300 mL of deionized water, then add 0.1 mol 2-methyl-1H-imidazol-5-carboxylic acid, stir until homogenized, and adjust the pH to 8.5 with ammonia water to obtain a sol. S2. Transfer the sol to a reactor and hydrothermally react at 105°C for 12 hours, then keep it at that temperature for 24 hours. Filter and wash to obtain the solid product. S3. Under nitrogen protection, the solid product is heated to 378°C at a rate of 8°C / min and held for 1 hour to obtain a porous oxide. 100g of the porous oxide and 5g of hexadecyltrimethoxysilane are refluxed in 500mL of toluene for 6 hours, filtered and dried to obtain bifunctional acidic site catalyst A.

[0035] Preparation Example 2 The preparation steps of the bifunctional acidic site catalyst B differ from those in Preparation Example 1 in that step S1 is adjusted as follows: S1. Dissolve 0.4 mol ZrOCl2·8H2O and 0.1 mol (NH4)2Ce(NO3)6 in 300 mL of deionized water, then add 0.1 mol 2-methyl-1H-imidazol-5-carboxylic acid, stir until homogenized, and adjust the pH to 8.5 with ammonia water to obtain a sol.

[0036] Preparation Example 3 The preparation steps of the bifunctional acidic site catalyst C differ from those in Preparation Example 1 in that step S3 is adjusted as follows: S3. Under nitrogen protection, the solid product is heated to 378°C at a rate of 8°C / min and held for 1 hour to obtain the bifunctional acidic site catalyst C.

[0037] Preparation Example 4 The preparation steps of the bifunctional acidic site catalyst D differ from those in Preparation Example 1 in that step S1 is adjusted as follows: S1. Dissolve 0.4 mol ZrOCl2·8H2O, 0.1 mol (NH4)2Ce(NO3)6, and 15 mmol La(NO3)3·6H2O in 300 mL of deionized water, stir to homogenize, and then adjust the pH to 8.5 with ammonia water to obtain a sol.

[0038] Example 1 A method for preparing a sulfosuccinate-type surfactant specifically includes the following steps: (1) Esterification reaction: Under nitrogen protection, 130g of isooctyl alcohol and 99g of maleic anhydride were added. After purging for 20min, 7g of bifunctional acidic site catalyst A was added. Then the temperature was raised to 100°C and reacted for 2.5h to obtain the esterification product. (2) Sulfonation reaction: The esterification product was cooled to 75°C, and 315g of 40wt% sodium sulfite aqueous solution was added dropwise. During the dropwise addition, the pH value of the system was controlled at 6.2±0.2 by 10wt% glacial acetic acid aqueous solution. After the dropwise addition was completed, the temperature was kept for 2h. (3) Post-processing: Cool the reaction system of step (2) to 45°C, vacuum filter to obtain filter cake and filtrate, wash the filter cake to obtain washing liquid, mix the washing liquid and filtrate, and concentrate to obtain sulfosuccinate type surfactant.

[0039] Example 2 A method for preparing a sulfosuccinate-type surfactant specifically includes the following steps: (1) Esterification reaction: Under nitrogen protection, 186g lauryl alcohol and 99g maleic anhydride were added, and after 15min of purging, 8.5g bifunctional acidic site catalyst A was added. Then the temperature was raised to 95°C and reacted for 3h to obtain the esterification product. (2) Sulfonation reaction: The esterification product was cooled to 70°C, and 315g of 40wt% sodium sulfite aqueous solution was added dropwise. During the dropwise addition, the pH value of the system was controlled at 6.2±0.2 by 10wt% glacial acetic acid aqueous solution. After the dropwise addition was completed, the temperature was kept for 1.5h. (3) Post-processing: Cool the reaction system of step (2) to 40°C, vacuum filter, wash the filter cake to obtain filter cake and filtrate, wash the filter cake to obtain washing liquid, mix the washing liquid and filtrate, and concentrate to obtain sulfosuccinate type surfactant.

[0040] Example 3 A method for preparing a sulfosuccinate-type surfactant specifically includes the following steps: (1) Esterification reaction: Under nitrogen protection, 88g pentanol and 99g maleic anhydride were added, and after 10min of purging, 6g of bifunctional acidic site catalyst A was added. Then the temperature was raised to 105°C and reacted for 3h to obtain the esterification product. (2) Sulfonation reaction: The esterification product was cooled to 80°C, and 315g of 40wt% sodium sulfite aqueous solution was added dropwise. During the dropwise addition, the pH value of the system was controlled at 6.2±0.2 by 10wt% glacial acetic acid aqueous solution. After the dropwise addition was completed, the temperature was kept for 1.5h. (3) Post-processing: Cool the reaction system of step (2) to 50°C, vacuum filter, wash the filter cake to obtain filter cake and filtrate, wash the filter cake to obtain washing liquid, mix the washing liquid and filtrate, and concentrate to obtain sulfosuccinate type surfactant.

[0041] Example 4 This embodiment provides a method for preparing a sulfosuccinate type surfactant. The specific implementation method is the same as that in Example 1, except that the bifunctional acidic site catalyst A in step (1) is replaced by an equal amount of bifunctional acidic site catalyst B.

[0042] Example 5 This embodiment provides a method for preparing a sulfosuccinate-type surfactant. The specific implementation method is the same as that in Example 1, except that the bifunctional acidic site catalyst A in step (1) is replaced by an equal amount of bifunctional acidic site catalyst C.

[0043] Example 6 This embodiment provides a method for preparing a sulfosuccinate type surfactant. The specific implementation method is the same as that in Example 1, except that the bifunctional acidic site catalyst A in step (1) is replaced by an equal amount of bifunctional acidic site catalyst D.

[0044] Example 7 This embodiment provides a method for preparing a sulfosuccinate type surfactant. The specific implementation method is the same as that in Example 1, except that the bifunctional acidic site catalyst A in step (1) is replaced by an equal amount of p-toluenesulfonic acid.

[0045] Example 8 This embodiment provides a method for preparing a sulfosuccinate type surfactant. The specific implementation method is the same as that in Example 1, except that step (2) is adjusted to: cooling the esterification product to 75°C, adding 315g of 40wt% sodium sulfite aqueous solution, and keeping it warm for 2h after the addition is complete.

[0046] Performance testing 1. The yield and APHA color of the sulfosuccinate surfactants obtained in Examples 1-8 above were tested.

[0047] 2. Cyclic stability test: After drying the filter cake in step (3), the catalyst used once was tested. The yield of the catalyst was tested after 5 cycles (if the catalyst was missing before use, it was replenished to the mass of the first use).

[0048] The test results are shown in Table 1.

[0049] Table 1 Test Results As shown in Table 1, Examples 1-3 exhibited similar yields on different fatty alcohol bases, indicating that the process conditions and catalyst of this invention have a wide applicability. Furthermore, the APHA color intensity of all examples being less than 20 (close to colorless) suggests few side reactions and minimal production of dark-colored byproducts. Additionally, the catalysts in Examples 1-3 maintained yields of over 85% after five cycles, demonstrating their stable performance.

[0050] Compared to Example 1, the catalyst used in Example 4 did not incorporate a lanthanum source, resulting in a lower yield. This may be due to the presence of lanthanum. 3+ The absence of Ce 3+ The reduction in silane content led to an increase in byproducts and a slight increase in APHA color. The catalyst in Example 5 lacked further surface modification with silane, resulting in decreased yield cycle stability and increased color. This is because hydrophobic surface modification can prevent catalyst deactivation and hydrolysis side reactions of maleic anhydride / monoester.

[0051] Based on Examples 1 and 6, it can be seen that the absence of a template agent during catalyst synthesis is detrimental to controlling the hydrolysis-condensation rate during the hydrothermal process, and also reduces the Ce content that limits the oxidation of the sulfonating agent sodium sulfite. 3+ / Ce 4+ The number of redox pairs decreases the yield. Compared to Example 1, Example 7 uses a conventional catalyst, p-toluenesulfonic acid. In the one-pot method of this invention, p-toluenesulfonic acid remains dissolved in the reaction system after the esterification stage. If sodium sulfite is added directly for sulfonation, p-toluenesulfonic acid will immediately undergo a neutralization reaction with sodium sulfite, generating sodium p-toluenesulfonate and inorganic sulfuric acid / sulfuric acid, leading to catalyst deactivation and pH loss of control in the sulfonation reaction system, thus preventing the reaction from proceeding.

[0052] Compared to Example 1, Example 8 did not control the pH value of the reaction system when adding the sodium sulfite aqueous solution as the sulfonating agent. This is not conducive to guiding the sulfonation reaction to the direction of generating the target sulfosuccinate, making it impossible to maximally suppress side reactions such as the sulfonic acid group attaching to the wrong position or the occurrence of ester bond hydrolysis, resulting in a decrease in yield and an increase in color.

[0053] The embodiments and comparative examples described above do not limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a sulfosuccinate-type surfactant, characterized in that, Specifically, it includes the following steps: (1) Esterification reaction: Under the protection of inert gas, fatty alcohol and carboxylic anhydride are added, and after purging for 10 to 20 minutes, a bifunctional acidic site catalyst is added. Then the temperature is raised to 95 to 105°C and the reaction is carried out for 2 to 3 hours to obtain the esterification product. (2) Sulfonation reaction: Cool the esterification product to 70-80°C, add 20-40 wt% of sulfonating agent aqueous solution dropwise, keep warm for 1-2 hours after the addition is complete, and then after post-treatment, the sulfosuccinate type surfactant is obtained.

2. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (1), the amount of the bifunctional acidic site catalyst is 1.5 to 4.5 wt% of the total mass of fatty alcohols and carboxylic anhydrides.

3. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (1), the preparation steps of the bifunctional acidic site catalyst are as follows: S1. Dissolve zirconium source and cerium source in deionized water, then add template agent, stir to homogenize, and adjust pH to 8-9 to obtain sol; S2. Transfer the sol to a reaction vessel and hydrothermally react at 100-110°C for 8-16 hours, then keep it at that temperature for 12-36 hours, filter, wash, and obtain the solid product. S3. Under inert gas protection, the solid product is heated to 350-390°C at a rate of 4-12°C / min and held at that temperature for 0.5-1.5h to obtain a porous oxide. The porous oxide and silane are refluxed in toluene for 4-8h, filtered, and dried to obtain a bifunctional acidic site catalyst.

4. The method for preparing sulfosuccinate-type surfactants according to claim 3, characterized in that, A lanthanum source was also added in step S1.

5. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (1), the carbon chain length of the fatty alcohol is 6 to 14.

6. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (1), the fatty alcohol may also contain ether bonds.

7. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (1), the carboxylic anhydride is any one of acetic anhydride, maleic anhydride, phthalic anhydride, and succinic anhydride.

8. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (2), during the addition of the sulfonating agent aqueous solution, the pH of the reaction system is controlled to be 6.0 to 6.

5.

9. The method for preparing sulfosuccinate-type surfactants according to claim 1, characterized in that, In step (2), the post-processing specifically involves: after the heat preservation is completed, the reaction system is cooled to 40-50°C, vacuum filtered to obtain filter cake and filtrate, the filter cake is washed to obtain washing liquid, the washing liquid and filtrate are mixed and concentrated to obtain sulfosuccinate type surfactant.

10. The application of a sulfosuccinate-type surfactant obtained by the preparation method according to any one of claims 1-9 in the agricultural emulsion and printing and dyeing industries.

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