Surface-active freezing point enhancer for octyl succinate sulfonate aqueous formulations and use thereof

Abstract

The application discloses a surface-active anti-freezing synergist of octyl succinate sulfonate aqueous agent and application, and belongs to the field of additives.The surface-active anti-freezing synergist is composed of a gemini surfactant of formula (I) and a gemini surfactant of formula (II) according to a ratio of 1:1.5-1:7.The anti-freezing synergist has low surface tension, improved solubility and emulsification, especially can enhance solubility at low temperature, thereby improving the anti-freezing property of the octyl succinate sulfonate aqueous agent, and guaranteeing good solubility and solution stability at-10 DEG C-0 DEG C.In addition, due to the low surface tension, the solution forms micro-micelles at low temperature, prevents the solution from being stratified at low temperature, and further improves the stability of the product.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary agents, and in particular to a surface active antifreeze synergist for octyl sulfosuccinate aqueous solution and application thereof. Background Art

[0002] Sulfosuccinate is a general surfactant. One of the earliest industrial products is dioctyl sodium sulfosuccinate, which is a commonly used fast penetrant T, referred to as Fast T.

[0003] Sodium dioctyl sulfosuccinate is primarily used in the textile, coating, metalworking, and pesticide industries, primarily as a wetting agent, penetrant, emulsifier, and dispersant. Dioctyl sulfosuccinate is primarily used as solid dioctyl sulfosuccinate, aqueous dioctyl sulfosuccinate solutions, and anhydrous dioctyl sulfosuccinate. Solid dioctyl sulfosuccinate (docus sodium) is used in biopharmaceuticals, while anhydrous dioctyl sulfosuccinate is primarily used in anhydrous formulations, such as anhydrous pesticides and coatings. Solid dioctyl sulfosuccinate is generally not directly dissolved in water to form an aqueous solution. Even if direct dissolution is performed, the dissolution rate of solid and anhydrous dioctyl sulfosuccinate is slow, resulting in low production efficiency. Therefore, aqueous dioctyl sulfosuccinate solutions are generally used in applications such as textiles, leather, firefighting, and tunneling.

[0004] Dioctyl sulfonate succinate aqueous solution is a solvent formed by dissolving dioctyl sulfonate succinate in water. However, the solubility of dioctyl sulfonate succinate in water is low, only 12.5g / L (25°C). Direct dissolution of the two forms a gel-like paste, so a solubilizer is generally added. Currently, conventional solubilizers are lower alcohols, such as methanol, ethanol, and isopropanol. However, lower alcohols themselves lack wetting and penetrating properties, and as additives, they only have a solubilizing effect, increasing costs. Furthermore, after use, lower alcohols are dissipated into the atmosphere, increasing carbon emissions.

[0005] In addition, dioctyl succinate sulfonate aqueous solution prepared with low-grade alcohol as solvent also has the problem of poor frost resistance. 40-60% dioctyl succinate sulfonate aqueous solution will first become turbid and gradually separate into oil and water layers below 10-15°C, resulting in limited use. After separation, the dioctyl succinate sulfonate aqueous solution added to textile printing and dyeing auxiliaries can easily lead to problems such as inconsistent color of the printed and dyed products, increased foaming, and difficulty in cleaning. In the agrochemical industry, dioctyl succinate sulfonate aqueous solution is spread on the surface of the fabric as a penetrant. After separation, the wetting and permeability of the dioctyl succinate sulfonate aqueous solution is reduced, resulting in reduced efficacy and waste of the original drug. If the dioctyl succinate sulfonate aqueous solution is to be restored to a homogeneous phase for normal use, it must be heated to above 20°C under stirring conditions, resulting in further waste of resources.

[0006] The aqueous solution of dioctyl sulfonate succinate has good wetting and penetrating properties at low and medium dilutions, but its wetting and penetrating properties decrease rapidly at high dilutions (about 5000 times), affecting its use.

[0007] To increase the wetting and permeability of dioctyl sulfonate aqueous solutions, nonionic and anionic surfactants are currently added. Anionic surfactants are typically sodium xylene sulfonate, sodium lauryl sulfate, and sodium fatty alcohol polyether sulfate. The addition of anionic surfactants improves the wetting and permeability of dioctyl sulfonate aqueous solutions to a certain extent, but has little effect on the solubility of dioctyl sulfonate in water and may even reduce its solubility in water. Nonionic surfactants are typically fatty alcohol polyethers. The addition of nonionic surfactants can slightly increase water solubility, reduce the amount of lower alcohol used, and improve frost resistance. However, the addition of nonionic surfactants has no synergistic effect on the wetting and permeability of dioctyl sulfonate aqueous solutions. Furthermore, their price is higher than that of lower alcohols, which increases the cost. Summary of the Invention

[0008] In order to solve the above problems, the present invention proposes a surfactant enhancer for dioctyl sulfonate succinate aqueous solution, which can replace the lower alcohol in dioctyl sulfonate succinate aqueous solution to achieve the effect of solubilizing dioctyl sulfonate succinate, while improving the wetting permeability and antifreeze properties of the dioctyl sulfonate aqueous solution.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0010] A succinate octyl sulfonate aqueous solution synergist, comprising the following components:

[0011] (a) a gemini surfactant of formula (I);

[0012] In formula (I), R1 is a C6-C8 alkyl group, R2 is a C2-C4 alkyl group; Z + for Na + , K + NH4 + Any of the following;

[0013] (b) a gemini surfactant of formula (II),

[0014] In formula (II), R is a C6 or C8 alkyl group, and the M + for Na + , K + NH4 + Any of the following;

[0015] The mass ratio between the gemini surfactant of formula (I) and the gemini surfactant of formula (II) is 1:1.5-1:7.

[0016] Furthermore, the R1 is any one of n-hexyl, n-octyl, isooctyl and sec-octyl.

[0017] Furthermore, the R is any one of n-hexyl, n-octyl, isooctyl and sec-octyl.

[0018] The invention discloses an application of a surfactant antifreeze synergist in an octyl sulfonate succinate aqueous solution, specifically comprising the following steps: adding the surfactant antifreeze synergist to the octyl sulfonate succinate aqueous solution to obtain an antifreeze synergistic octyl sulfonate succinate aqueous solution.

[0019] Furthermore, the antifreeze synergistic agent is added to octyl succinate sulfonate and mixed to form an antifreeze synergistic octyl succinate sulfonate aqueous solution, which includes the following components in percentage by mass: 40-70% octyl succinate sulfonate, 3-10% surfactant antifreeze synergist, and the balance water.

[0020] Furthermore, the octyl sulfosuccinate is sodium octyl sulfosuccinate.

[0021] The surface active antifreeze synergist for octyl sulfosuccinate aqueous solution and its application of the present invention have the following beneficial effects:

[0022] (1) The gemini surfactant of formula (I) of the present invention uses R2 as a linker, wherein R2 is a C2-C4 alkyl group, and an amide group and an ester group are connected to the two ends of the linker, respectively, to form an asymmetric anionic gemini surfactant with the dual functions of an amide group and an ester group. Amide groups are polar groups. Surfactants containing amide groups are more likely to interact through intermolecular hydrogen bonds or dipole moments, causing the surfactant molecules in the adsorption layer to be more tightly arranged, thereby enhancing surface activity and improving the wetting and permeability of the aqueous solution of octyl sulfonate succinate. They can also synergize with the gemini surfactant of formula (II) to form a vesicle structure in octyl sulfonate succinate, further improving the wetting and permeability.

[0023] (2) The gemini surfactant of formula (II) uses ethylene glycol as a linker. The structure of the linker "diester group" gives it excellent hydrophilic and lipophilic properties. In formula (II), R is preferably isooctyl and sec-octyl as the end group, which increases the number of branches and improves the wettability. It has extremely high solubility in both water and organic matter, and can be added as a solubilizer to replace low-level alcohols to solve the solubilization problem.

[0024] (3) The gemini surfactants of formula (I) and formula (II) of the present invention have low surface tension, improved solubility and emulsification, and can particularly enhance solubility at low temperatures, thereby improving the frost resistance of the aqueous solution of octyl sulfosuccinate, ensuring good solubility and solution stability at temperatures between -10°C and 0°C. Furthermore, due to the low surface tension, the solution forms microscopic micelles at low temperatures, preventing the solution from stratifying at low temperatures, thereby improving the stability of the product. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] A surfactant antifreeze synergist for octyl sulfosuccinate aqueous solution, comprising the following components:

[0027] (a) a gemini surfactant of formula (I);

[0028] In formula (I), R1 is a C6-C8 alkyl group, R2 is a C2-C4 alkyl group; Z + for Na + , K + NH4 + Any of the following;

[0029] (b) a gemini surfactant of formula (II),

[0030] In formula (II), R is a C6 or C8 alkyl group, and the M + for Na + , K + NH4 + Any of the following;

[0031] The mass ratio between the gemini surfactant of formula (I) and the gemini surfactant of formula (II) is 1:1.5-1:7.

[0032] The preparation method of the gemini surfactant of formula (I) comprises the following steps:

[0033] ① The raw material C2-C4 alkyl alcohol amine and maleic anhydride are reacted with amidation and esterification in the presence of anhydrous sodium acetate catalyst and a solvent at 60-100°C for 2 hours to obtain an intermediate;

[0034] ② Add C6-C8 fatty alcohol and solid acid catalyst to the intermediate, and carry out diesterification reaction at a temperature of 120-180°C to obtain geminal maleic acid diester;

[0035] ③ Adding a sulfonating agent, sodium bisulfate, and a co-catalyst to the gemini maleic acid diester in the presence of water, and carrying out sulfonation at a temperature of 100-120° C. for 6 hours to obtain a sulfonate gemini surfactant.

[0036] In step ①, the C2-C4 alkyl alcoholamine is any one of ethanolamine, propanolamine and butanolamine; the molar ratio of the C2-C4 alkyl alcoholamine to maleic anhydride is 1:2.0-2.5; preferably 1:2.1 in this embodiment.

[0037] In step ①, the amount of anhydrous sodium acetate added is 0.5-1% of the total mass of the C2-C4 alkyl alcohol amine and maleic anhydride. In this embodiment, the amount of anhydrous sodium acetate added is preferably 0.5% of the total mass of the C2-C4 alkyl alcohol amine and maleic anhydride.

[0038] The solvent in step ① is cyclohexane, or n-heptane, or toluene, or xylene; in this embodiment, toluene is preferred.

[0039] The C6-C8 fatty alcohol in step ② is any one of n-hexyl, n-octyl, isooctyl, and sec-octyl; in this embodiment, sec-octyl is preferred. The C6-C8 fatty alcohol is added in an amount calculated based on maleic anhydride, with a molar ratio of maleic anhydride to fatty alcohol of 1:1.1. The solid acid catalyst is HND-26, and the amount of the solid acid catalyst added is 0.5-3% by weight of the maleic anhydride; in this embodiment, the amount of the solid acid catalyst added is preferably 2% by weight of the maleic anhydride.

[0040] In step ③, the sulfonating agent is any one of sodium bisulfite, potassium bisulfite, and ammonium bisulfite. The molar ratio of the added amount of the sulfonating agent to maleic anhydride is: maleic anhydride: sulfonating agent = 1: (1-1.2). In this embodiment, the most preferred ratio is maleic anhydride: sodium bisulfite = 1: 1.0.5.

[0041] In step ③, the co-catalyst is a mixture of ethanol and dimethyl sulfoxide in a molar ratio of 1:1; the amount of the co-catalyst added is 0.3-0.6% by weight of the gemini maleic acid diester; in this embodiment, the amount of the co-catalyst added is preferably 0.5% by weight of the gemini maleic acid diester.

[0042] The amount of water added in step ③ is based on the mass ratio of maleic anhydride: maleic anhydride: water = 1:1.2.

[0043] In the present invention, Z in the Gemini surfactant of formula (I) + for Na + , K + NH4 +Any one or more of them. + are all monovalent ions, and the groups that play a role in surface activity are mainly gemini amide-ester groups, so the Na + , K + NH4 + The effect on the Gemini surfactant is not significant and can even be ignored. Therefore, in the examples, the Gemini surfactant of formula (I) is used, and the Na + , K + NH4 + .

[0044] In the present invention, the gemini surfactant of formula (II) is + for Na + , K + NH4 + Any one or more of them. + are all monovalent ions, and the groups that play a role in surface activity are mainly gemini amide-ester groups, so the Na + , K + NH4 + The effect on the Gemini surfactant is not significant and can even be ignored. Therefore, in the examples, the Gemini surfactant of formula (II) is used, and the Na + , K + NH4 + .

[0045] The invention discloses an application of a surfactant antifreeze synergist in an octyl sulfonate succinate aqueous solution, specifically comprising the following steps: adding the surfactant antifreeze synergist to the octyl sulfonate succinate aqueous solution to obtain an antifreeze synergistic octyl sulfonate succinate aqueous solution.

[0046] Specifically, the antifreeze-enhancing octyl succinate sulfonate aqueous solution comprises the following components, in percentage by mass: 40-70% octyl succinate sulfonate, 3-10% surfactant antifreeze synergist, and the balance water.

[0047] The formulation of the application example of the antifreeze synergistic succinate octyl sulfonate aqueous solution is shown in Table 1:

[0048] Table 1 Distribution of components in application examples

[0049]

[0050]

[0051]

[0052] Comparative Example 1

[0053] An octyl sulfosuccinate aqueous solution comprises the following components in percentage by mass: 48.5% octyl sulfosuccinate and the balance water.

[0054] Comparative Example 2

[0055] An octyl sulfonate succinate aqueous solution comprises the following components in percentage by mass: 48.5% octyl sulfonate succinate, 10% methanol, and the balance water.

[0056] Comparative Example 3

[0057] An octyl sulfosuccinate aqueous solution comprises the following components in percentage by mass: 59% octyl sulfosuccinate, 5% methanol, and the balance water.

[0058] Comparative Example 4

[0059] An octyl sulfonate succinate aqueous solution comprises the following components in percentage by mass: 70% octyl sulfonate succinate, 6% methanol, and the balance water.

[0060] Comparative Example 5

[0061] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, ethanol 10%, and the balance water.

[0062] Comparative Example 6

[0063] An octyl sulfosuccinate aqueous solution comprises the following components in percentage by mass: 59% octyl sulfosuccinate, 5% ethanol, and the balance water.

[0064] Comparative Example 7

[0065] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 70%, ethanol 6%, and the balance water.

[0066] Comparative Example 8

[0067] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, methanol 10%, AEO5 5%, and the balance water.

[0068] Comparative Example 9

[0069] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, methanol 10%, peregal 30 1%, and the balance water.

[0070] Comparative Example 10

[0071] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, ethanol 10%, nonylphenol polyether 10.1%, and the balance water.

[0072] Comparative Example 11

[0073] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, ethanol 10%, trisodium sulfosuccinate 3.2%, and the balance water.

[0074] Comparative Example 12

[0075] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, ethanol 10%, Tween 80 5%, and the balance water.

[0076] Comparative Example 13

[0077] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, ethanol 10%, polyethylene glycol 600 5%, and the balance water.

[0078] Comparative Example 14

[0079] An octyl succinate sulfonate aqueous solution comprises the following components in percentage by mass: 48.5% octyl succinate sulfonate, 10% ethanol, 5% sodium xylene sulfonate, and the balance being water.

[0080] Comparative Example 15

[0081] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 48.5%, ethanol 10%, sodium lauryl sulfate 5%, and the balance water.

[0082] Comparative Example 16

[0083] An octyl sulfonate succinate aqueous solution comprises the following components in percentage by mass: 48.5% octyl sulfonate succinate, 5% of a gemini surfactant of formula (I) (R1 is isooctyl alcohol, R2=2), and the balance is water.

[0084] Comparative Example 17

[0085] An octyl succinate sulfonate aqueous solution comprises the following components in percentage by mass: 48.5% octyl succinate sulfonate, 5% of a gemini surfactant of formula (I) (R1 is n-octanol, R2=2), and the balance is water.

[0086] Comparative Example 18

[0087] An octyl succinate sulfonate aqueous solution comprises the following components, in percentage by mass: 48.5% octyl succinate sulfonate, 5% of a gemini surfactant of formula (I) (R1 is n-hexanol, R2=2), and the balance is water.

[0088] Comparative Example 19

[0089] An octyl sulfonate succinate aqueous solution comprises the following components in percentage by mass: 59% octyl sulfonate succinate, 5% gemini surfactant of formula (II) (R is isooctyl alcohol), and the balance is water.

[0090] Comparative Example 20

[0091] An octyl succinate sulfonate aqueous solution comprises the following components in percentage by mass: 70% octyl succinate sulfonate, 5% gemini surfactant of formula (II) (R is n-hexanol), and the balance is water.

[0092] Comparative Example 21

[0093] An octyl succinate sulfonate aqueous solution comprises the following components in percentage by mass: 48.5% octyl succinate sulfonate, 8% of a gemini surfactant of formula (II) (R is isooctyl alcohol), and the balance is water.

[0094] Comparative Example 22

[0095] An octyl succinate sulfonate aqueous solution comprises the following components in percentage by mass: 48.5% octyl succinate sulfonate, 8% of a gemini surfactant of formula (II) (R is n-hexanol), and the balance is water.

[0096] Comparative Example 23

[0097] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 70%, organosilicon polyether 5%, and the balance water.

[0098] Comparative Example 24

[0099] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 40%, organosilicon polyether 5%, and the balance water.

[0100] Comparative Example 25

[0101] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 60%, organosilicon polyether 10%, and the balance water.

[0102] Comparative Example 26

[0103] A succinate octyl sulfonate aqueous solution comprises the following components in percentage by mass: succinate octyl sulfonate 60%, penetrant JFC 10%, and the balance water.

[0104] Performance testing

[0105] 1. Antifreeze performance test

[0106] The application examples 1-54 and comparative examples 1-16 were stored at -10°C, -5°C, 0°C, 5°C, and 10°C for 24 hours. The physical properties of the aqueous solution were observed, and the obtained data are shown in Table 2:

[0107] Table 2 Antifreeze performance

[0108]

[0109]

[0110]

[0111]

[0112] As can be seen from Table 2, the antifreeze temperature of the antifreeze-enhancing octyl sulfosuccinate aqueous solution obtained in Application Example 1-56 has been reduced from the original 10-15°C to below 0°C.

[0113] Comparative Example 1, without any cosolvent, was a gel-like, non-aqueous, transparent liquid at room temperature. Comparative Examples 2-3 and Comparative Examples 5-6 used conventional cosolvents, lower alcohols, but all exhibited delamination or precipitation at 0-5°C, and all showed delamination and precipitation at -10°C, significantly reducing solubility and stability and resulting in poor antifreeze performance. Comparing Comparative Examples 2-3 with Application Example 1, and Comparative Examples 5-6 with Application Example 7, the antifreeze enhancers of the present invention significantly improved the antifreeze performance of octyl succinate sulfonate aqueous solutions compared to conventional cosolvents, lower alcohols.

[0114] Comparative Examples 4 and 7 are high-concentration aqueous solutions, and since the amount of water is small, there is no antifreeze problem.

[0115] Comparative Examples 8-10 and 12-13 use a mixture of lower alcohol and nonionic surfactant as a cosolvent, among which only the surfactant of Comparative Examples 9-10 has obvious solubilization and antifreeze effects. Although the solubilization effect of Comparative Examples 9-10 reduces the amount of alcohol used and the antifreeze property is improved to a certain extent, stratification still occurs below 0°C, and stratification occurs at -5°C. The antifreeze effect is greatly reduced compared with the present invention.

[0116] The cosolvent used in Comparative Example 11 is a mixture of a lower alcohol and a sodium salt, which has no anionic activity, demixes or precipitates at 0°C, and has poor antifreeze performance. In addition, the sodium salt is highly irritating and a sensitizer, which affects its application range.

[0117] Comparative Examples 14-15 use a mixture of lower alcohol and common anionic surfactant as a cosolvent, which instead reduces the solubility.

[0118] Comparative Examples 16-22 show that Comparative Examples 16-18, which used the gemini surfactant of Formula (I) alone as a cosolvent, had no solubilizing and antifreeze effect, remaining in a gel at 15°C. However, Comparative Examples 19-22 show that the gemini surfactant of Formula (II) as a cosolvent exhibited a certain solubilizing and antifreeze effect. Comparative Examples 16-22, compared with Application Examples 37-40, Application Example 42, and Application Example 48 of the present invention, demonstrate that the gemini surfactants of Formula (I) and (II) act synergistically, and their combination significantly improves the low-temperature solubility and antifreeze properties of octyl sulfosuccinate.

[0119] Comparative Examples 23-25 ​​use silicone polyether as a cosolvent, and Comparative Example 26 uses a conventional penetrant as a cosolvent. The antifreeze effects of the two cosolvents are relatively poor.

[0120] Wetting performance test

[0121] The aqueous solutions obtained in Examples 1-56 and Comparative Examples 1-26 were diluted to 1 / 5000 solutions and subjected to wetting performance tests. The wetting time of the 70% octyl succinate sulfonate aqueous solution in the examples was between 25-30 s; the wetting time of the 60-70% octyl succinate sulfonate aqueous solution was between 35-45 s, the wetting time of the 50-60% octyl succinate sulfonate aqueous solution was between 40-55 s, and the wetting time of the 40-50% octyl succinate sulfonate aqueous solution was between 55-70 s.

[0122] In the examples, the wetting time of the 70% aqueous solution was between 25-30 s; the wetting time of the 60-70% aqueous solution was between 35-45 s, the wetting time of the 50-60% aqueous solution was between 40-55 s, and the wetting time of the 40-50% aqueous solution was between 55-70 s.

[0123] The wetting times of comparative examples 1-26 and corresponding application examples are shown in Table 3:

[0124] Table 3 Wetting and penetration properties

[0125]

[0126]

[0127] As can be seen from Table 3, the wetting performance of the antifreeze-enhancing octyl succinate sulfonate aqueous solution obtained in the examples of the present invention is higher than that of the octyl succinate sulfonate aqueous solution obtained in comparative examples 1-26.

[0128] Comparative Examples 4, 7, 20, and 23 all used 70% octyl sulfonate aqueous solutions, with wetting times of 41, 41, 35, and 36 seconds, respectively. Comparative Examples 4 and 7, despite the addition of methanol and ethanol, respectively, exhibited wetting times longer than the 25-30 seconds of the present invention. Therefore, the commonly used solubilizers for octyl sulfonate aqueous solutions, methanol and ethanol, were unable to improve the wetting properties of the octyl sulfonate aqueous solution. Combining Tables 2 and 3, while Comparative Example 20 exhibited solubilization with one of the present invention's gemini surfactants, wetting properties were somewhat reduced. Comparative Example 23, despite the addition of a silicone, which can enhance wetting properties, exhibited poor solubility, and the silicone's wetting properties on the octyl sulfonate aqueous solution were also lower than those of the present invention's synergist.

[0129] Among them, the additional addition of additives in Comparative Examples 8 and 11-15 actually reduced the wetting and permeability.

[0130] While Comparative Examples 16-18 exhibit excellent wetting and permeability, Table 2 shows that the gemini surfactant of Formula (I) alone has no solubilizing and antifreeze effect. Comparative Examples 20-22 show that the gemini surfactant of Formula (II) fails to increase wetting and permeability. Therefore, in summary, using either the gemini surfactant of Formula (I) or (II) alone cannot achieve the dual effects of enhancing wettability and antifreeze properties of octyl sulfosuccinate aqueous solution. However, the present invention utilizes a specific mixing ratio to produce a cosolvent that both improves wettability and provides antifreeze properties.

[0131] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0132] Finally, it should be noted that the embodiments disclosed in the present invention are only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A surfactant antifreeze synergist of octyl succinate sulfonate aqueous solution, characterized in that: Contains the following components, (a) Gemini surfactant of formula (I) In formula (I), R1 is a C6-C8 alkyl group, R2 is a C2-C4 alkyl group; Z + for Na + , K + NH4 + Any of the following; (b) a gemini surfactant of formula (II), In formula (II), R is a C6 or C8 alkyl group, and the M + for Na + , K + NH4 + Any of the following; The mass ratio between the gemini surfactant of formula (I) and the gemini surfactant of formula (II) is 1:1.5-1:

7.

2. The surfactant antifreeze synergist of the octyl sulfosuccinate aqueous solution according to claim 1, characterized in that: The R1 is any one of n-hexyl, n-octyl, isooctyl and sec-octyl.

3. The surfactant antifreeze synergist of the octyl sulfosuccinate aqueous solution according to claim 1, characterized in that: The R is any one of n-hexyl, n-octyl, isooctyl and sec-octyl.

4. An application of the surfactant antifreeze synergist of the octyl sulfosuccinate aqueous solution according to any one of claims 1 to 3, characterized in that: A surfactant antifreeze synergist is added to an octyl succinate sulfonate aqueous solution to obtain an antifreeze-enhancing octyl succinate sulfonate aqueous solution; the antifreeze-enhancing octyl succinate sulfonate aqueous solution is formed by adding the surfactant to the octyl succinate sulfonate aqueous solution and mixing. The antifreeze-enhancing octyl succinate sulfonate aqueous solution comprises the following components, in percentage by mass: 40-70% octyl succinate sulfonate, 3-10% surfactant antifreeze synergist, and the balance water.

5. The use of the surfactant antifreeze synergist of the octyl succinate sulfonate aqueous solution according to claim 4, characterized in that: The octyl sulfosuccinate is sodium octyl sulfosuccinate.

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