Surfactant with low surface tension and preparation method thereof

Abstract

The invention discloses a surfactant with low surface tension, which is prepared from the following components in parts by weight: 100 to 130 parts of organic silicon resin, 4 to 6 parts of siloxane, 0.1 to 1 part of organic acid catalyst, 80 to 100 parts of organic solvent, 0.5 to 2 parts of water, 8 to 15 parts of inorganic salt, 75 to 100 parts of allyl polyether and 0.5 to 1 part of platinum catalyst. The invention also discloses a preparation method of the surfactant with low surface tension. According to the low-surface-tension surfactant disclosed by the invention, the surface tension of liquid is obviously reduced, the flowability and the leveling property of the liquid are improved, the lubrication and the glossiness of the surfactant are improved, and the low-surface-tension surfactant has foam discharging and defoaming effects.

Description

Technical Field

[0001] The invention relates to the technical field of surfactants, and in particular to a surfactant with low surface tension and a preparation method thereof. Background Art

[0002] Oil is an important energy source in the development of the world economy. Since the 1970s, oil has surpassed coal resource consumption and ranked first in the global energy consumption structure, and the world's oil consumption is still increasing.

[0003] With the continuous exploitation and consumption of conventional crude oil, over the past 100 years, mankind has consumed more than 45% of the recoverable reserves of light oil, and the recoverable reserves of conventional crude oil are only about 150 billion tons. Due to the high viscosity and poor fluidity of heavy oil, heavy oil stays in the pores of rock formations, which brings great difficulties to the heavy oil exploitation work and greatly reduces the recovery rate of heavy oil. In order to exploit the viscous heavy oil, a variety of methods have been developed to exploit the remaining large amount of heavy oil. For example, a large amount of chemical substances are added during the heavy oil exploitation process, among which a variety of surfactants are used, which can not only reduce the surface tension between crude oil and the interface, but also reduce the adsorption of oil by the rock layer, improve fluidity, and thus further improve the recovery rate of crude oil.

[0004] Chinese invention patent application CN112206716A discloses a hydrocarbon surfactant with low surface tension and a preparation method thereof. A hydrocarbon surfactant with low surface tension comprises, by mass percentage: 35-45% sodium sulfate of fatty alcohol ether, 15-25% dodecyl dimethyl amine oxide, 15-30% sodium dodecyl benzene sulfonate, 0-10% dodecyl trimethyl ammonium chloride, and 10-20% ethanol. The positively charged surfactant added in the invention mainly includes dodecyl dimethyl amine oxide, which can be used as a cationic surfactant under neutral or acidic conditions and as a non-ionic surfactant under alkaline conditions. Experiments have shown that dodecyl dimethyl amine oxide will not produce turbidity after compounding with anions, but its ability to reduce surface tension is equivalent to the compounding effect of cations and anions.

[0005] Chinese invention patent CN1129469C discloses a petroleum carboxylate surfactant, its preparation method and its application in tertiary oil recovery. The invention synthesizes petroleum carboxylates by oxidation reaction, and the raw material source is wide, the preparation price is low, and the product performance is stable. The petroleum carboxylates are compounded with other surfactants to have a good synergistic effect. The core flooding test of the compound system can greatly reduce the water content, concentrate the oil production, form an oil-rich zone, and the average recovery rate is increased by 20% OOIP compared with water flooding. The invention is not effective when used alone and needs to be compounded with other surfactants, and its performance in reducing surface tension is insufficient.

[0006] Although the surfactants disclosed in the above technical solutions have good water solubility, they all have the following disadvantages: insufficient ability to reduce surface tension and a small application range of the obtained surfactants. Summary of the invention

[0007] Purpose of the invention: In order to solve the above problems, the present invention discloses a surfactant with low surface tension and a preparation method thereof.

[0008] Technical solution: A surfactant with low surface tension, composed of the following components in parts by weight:

[0009] 100-130 parts of silicone resin, 4-6 parts of siloxane, 0.1-1 parts of organic acid catalyst, 80-100 parts of organic solvent, 0.5-2 parts of water, 8-15 parts of inorganic salt, 75-100 parts of allyl polyether, and 0.5-1 part of platinum catalyst.

[0010] Furthermore, the silicone resin is at least one of polymethyl silicone resin, methyl MQ silicone resin, polyaryl silicone resin, and polyalkylaryl silicone resin.

[0011] Furthermore, the organic silicone resin is a methyl MQ silicone resin, and the M / Q value of the methyl MQ silicone resin is 0.7 to 1.6.

[0012] Furthermore, the organic silicone resin is methyl MQ silicone resin, and the M / Q value of the methyl MQ silicone resin is 0.9.

[0013] Furthermore, the siloxane is at least one of tetramethyldisiloxane, trimethoxysilane, methyltriethoxysilane and dimethyldiethoxysilane, preferably tetramethyldisiloxane.

[0014] Furthermore, the organic acid catalyst is trifluoromethanesulfonic acid.

[0015] Furthermore, the organic solvent is at least one of ethyl acetate, methyl formate, dimethylformamide, dimethylacetamide, toluene, ethanol, acetone, methyl ethyl ketone, and cyclohexanone, preferably dimethylformamide.

[0016] Furthermore, the platinum catalyst is at least one of platinum chloride, platinum black, chloroplatinic acid hydrate, platinum asbestos, a chelated platinum complex, platinum silicon, and a sulfur-platinum complex.

[0017] Furthermore, the platinum catalyst is a composition of platinum black, platinum asbestos and platinum silicon, and the mass ratio thereof is (1-5): (1-3): (1-3), preferably 3:1.5:2.2.

[0018] Furthermore, the inorganic salt is at least one of a sodium salt and a potassium salt.

[0019] Furthermore, the inorganic salt is at least one of NaHCO3, Na2CO3, KHCO3, K2CO3, preferably NaHCO3.

[0020] A method for preparing the above-mentioned low surface tension surfactant comprises the following steps:

[0021] (1) mixing a formulated amount of an organosilicon resin and a formulated amount of a siloxane, and then stirring to obtain a mixed solution;

[0022] (2) adding a formula amount of an organic acid catalyst and a formula amount of water to the mixed solution obtained in step (1) and mixing them evenly, stirring for a period of time to complete a first reaction, and obtaining a first reaction solution after the reaction is completed, and then adding a formula amount of an organic solvent to the mixed solution and stirring, and continuing a second reaction, and after the reaction is completed, cooling to room temperature to obtain a second reaction solution;

[0023] (3) Continue to add a formulated amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly, filter, take the filtrate, and then boil at 40 to 50° C. to obtain a low-boiling substance;

[0024] (4) mixing the low boiling point product obtained in step (3) with a formulated amount of allyl polyether and a formulated amount of platinum catalyst for reaction, and obtaining a surfactant with low surface tension after the reaction is completed.

[0025] Furthermore, the stirring temperature in step (1) is 40 to 50° C., and the stirring time is 30 to 45 min.

[0026] Furthermore, in step (2), the reaction temperature of the first reaction is 65-75° C., and the reaction time is 5-8 h.

[0027] Furthermore, in step (2), the reaction temperature of the second reaction is 45-55° C., and the reaction time is 0.8-1.2 h.

[0028] Furthermore, the mass fraction of Si-H groups in the low boiling point product in step (3) is 0.1% to 6%.

[0029] Furthermore, the reaction temperature in step (4) is room temperature, and the reaction time is 1 to 2 hours.

[0030] Beneficial effects: The low surface tension surfactant and the preparation method thereof disclosed in the present invention have the following beneficial effects:

[0031] The present invention not only improves the compatibility of each component of the mixed system by selectively adding a methyl MQ silicone resin with a specific M / Q value to act on siloxane, but also affects the strength of the ionic bond between the methyl MQ silicone resin and the siloxane, affects the physical properties of the system, and improves the rheological properties of the liquid. The added methyl MQ silicone resin has a small molecular weight, and the densely added allyl polyether forms a crosslink with the methyl MQ silicone resin, and then forms a firm chemical fusion with the siloxane, the movement of molecules to the inside is weakened, the surface molecular density is increased, the effective distance between molecules is shortened, the intermolecular attraction is weakened, the surface "tightness" is reduced, and the liquid surface tension of the surfactant system is significantly reduced, the fluidity and leveling properties thereof are improved, the lubrication and glossiness of the surfactant are enhanced, and the foam removal and defoaming effects are provided. Specific implementation method:

[0032] The specific embodiments of the present invention are described in detail below.

[0033] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0034] The present invention selects and adds a methyl MQ silicone resin with a specific M / Q value to react with siloxane, thereby not only improving the compatibility of various components of the mixed system, but also affecting the strength of the ionic bond between the methyl MQ silicone resin and the siloxane, affecting the physical properties of the system, and improving the rheological properties of the liquid. In particular, when M / Q=0.9, the methyl MQ silicone resin and the siloxane have a slight phase separation structure, the methyl MQ silicone resin is a dispersed phase, the dispersed phase size is not large and the dispersion is relatively uniform, which not only improves the dispersion degree but also improves the compatibility of the methyl MQ silicone resin with other components in the system, and improves the reaction efficiency.

[0035] The mass ratio of methyl MQ silicone resin to siloxane and allyl polyether added at the same time is (100-130): (4-6): (75-100). The molecular weight of methyl MQ silicone resin is small. The densely added allyl polyether forms a cross-link with the methyl MQ silicone resin, and then forms a strong chemical fusion with the siloxane. The movement of molecules inward is weakened, the surface molecular density is increased, the effective distance between molecules is shortened, the intermolecular attraction is weakened, the surface "tightness" is reduced, and the liquid surface tension of the surfactant system is significantly reduced. The fluidity and leveling properties are improved, the lubrication and emulsification ability of the surfactant is enhanced, and it has the functions of defoaming and effective foaming.

[0036] The allyl polyether (CAS No.: 27274-31-3) used in this application was purchased from Liaoning Kelong Fine Chemical Co., Ltd., with a specification of APEG-1000.

[0037] Example 1

[0038] A surfactant with low surface tension, wherein the raw materials include, by weight: 120 parts of silicone resin, 5.5 parts of siloxane, 0.6 parts of organic acid catalyst, 95 parts of organic solvent, 0.7 parts of water, 10 parts of inorganic salt, 90 parts of allyl polyether and 0.65 parts of platinum catalyst.

[0039] The organic silicone resin is methyl MQ silicone resin, the M / Q value of the methyl MQ silicone resin is 0.9, and the methyl MQ silicone resin is purchased from Yantai Shunming New Materials Co., Ltd.

[0040] Siloxane was tetramethyldisiloxane (CAS No.: 3277-26-7), purchased from Shanghai En Chemical Technology Co., Ltd.

[0041] The organic acid catalyst was trifluoromethanesulfonic acid (CAS No.: 1493-13-6), which was purchased from Shanghai Yien Chemical Technology Co., Ltd.

[0042] The organic solvent was dimethylformamide (CAS No.: 68-12-2), which was purchased from Jiuding Chemical (Shanghai) Technology Co., Ltd.

[0043] The inorganic salt was NaHCO3, which was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0044] The platinum catalyst is a composition of platinum black, platinum asbestos and platinum silicon, and the mass ratio of platinum black, platinum asbestos and platinum silicon is 3:1.5:2.2.

[0045] Platinum black, platinum asbestos, and platinum silicon were purchased from Shaanxi Kaida Chemical Co., Ltd.

[0046] A method for preparing the above-mentioned low surface tension surfactant comprises the following steps:

[0047] (1) mixing a formulated amount of an organosilicon resin and a formulated amount of a siloxane, and then stirring to obtain a mixed solution;

[0048] (2) adding a formula amount of an organic acid catalyst and a formula amount of water to the mixed solution obtained in step (1) and mixing them evenly, stirring for a period of time to complete a first reaction, and obtaining a first reaction solution after the reaction is completed, and then adding a formula amount of an organic solvent to the mixed solution and stirring, and continuing a second reaction, and after the reaction is completed, cooling to room temperature to obtain a second reaction solution;

[0049] (3) adding a formulated amount of inorganic salt to the second reaction solution obtained in step (2), stirring and filtering, taking the filtrate, and then boiling at 45° C. to obtain a low-boiling substance;

[0050] (4) mixing the low boiling point product obtained in step (3) with a formulated amount of allyl polyether and a formulated amount of platinum catalyst for reaction, and obtaining a surfactant with low surface tension after the reaction is completed.

[0051] Furthermore, the stirring temperature in step (1) is 46° C. and the stirring time is 35 min.

[0052] Furthermore, in step (2), the reaction temperature of the first reaction is 70° C. and the reaction time is 6 h.

[0053] Furthermore, in step (2), the reaction temperature of the second reaction is 50° C., and the reaction time is 0.8 to 1 h.

[0054] Furthermore, the mass fraction of Si-H groups in the low boiling point product in step (3) is 0.1% to 6%.

[0055] Furthermore, the reaction temperature in step (4) is room temperature and the reaction time is 1.5 h.

[0056] Example 2

[0057] It is substantially the same as Example 1, except that:

[0058] 1. Different ratios of raw materials:

[0059] The raw materials of the low surface tension surfactant include: 100 parts of silicone resin, 4.5 parts of siloxane, 0.4 parts of organic acid catalyst, 80 parts of organic solvent, 0.6 parts of water, 8.5 parts of inorganic salt, 80 parts of allyl polyether and 0.5 parts of platinum catalyst.

[0060] 2. Different silicone resins:

[0061] The organic silicone resin is methyl MQ silicone resin, the M / Q value of the methyl MQ silicone resin is 0.8, and the methyl MQ silicone resin is purchased from Yantai Shunming New Materials Co., Ltd.

[0062] Example 3

[0063] A surfactant with low surface tension, composed of the following components in parts by weight:

[0064] 100 parts of silicone resin, 4 parts of siloxane, 0.1 parts of organic acid catalyst, 80 parts of organic solvent, 0.5 parts of water, 8 parts of inorganic salt, 75 parts of allyl polyether, and 0.5 parts of platinum catalyst.

[0065] Furthermore, the organic silicone resin is methyl MQ silicone resin, and the M / Q value of the methyl MQ silicone resin is 0.9.

[0066] Furthermore, the siloxane is tetramethyldisiloxane.

[0067] Furthermore, the organic acid catalyst is trifluoromethanesulfonic acid.

[0068] Furthermore, the organic solvent is dimethylformamide.

[0069] Furthermore, the platinum catalyst is a composition of platinum black, platinum asbestos and platinum silicon, and the mass ratio thereof is 3:1.5:2.2.

[0070] Furthermore, the inorganic salt is NaHCO3.

[0071] A method for preparing the above-mentioned low surface tension surfactant comprises the following steps:

[0072] (1) mixing a formulated amount of an organosilicon resin and a formulated amount of a siloxane, and then stirring to obtain a mixed solution;

[0073] (2) adding a formula amount of an organic acid catalyst and a formula amount of water to the mixed solution obtained in step (1) and mixing them evenly, stirring for a period of time to complete a first reaction, and obtaining a first reaction solution after the reaction is completed, and then adding a formula amount of an organic solvent to the mixed solution and stirring, and continuing a second reaction, and after the reaction is completed, cooling to room temperature to obtain a second reaction solution;

[0074] (3) adding a formulated amount of inorganic salt to the second reaction solution obtained in step (2), stirring and filtering, taking the filtrate, and then boiling at 40° C. to obtain a low-boiling substance;

[0075] (4) mixing the low boiling point product obtained in step (3) with a formulated amount of allyl polyether and a formulated amount of platinum catalyst for reaction, and obtaining a surfactant with low surface tension after the reaction is completed.

[0076] Furthermore, the stirring temperature in step (1) is 40° C. and the stirring time is 45 min.

[0077] Furthermore, in step (2), the reaction temperature of the first reaction is 65° C. and the reaction time is 8 h.

[0078] Furthermore, in step (2), the reaction temperature of the second reaction is 45° C., and the reaction time is 1.2 h.

[0079] Furthermore, the mass fraction of Si-H groups in the low boiling point product in step (3) is 0.1%.

[0080] Furthermore, the reaction temperature in step (4) is room temperature and the reaction time is 1 h.

[0081] Example 4

[0082] A surfactant with low surface tension, composed of the following components in parts by weight:

[0083] 130 parts of organic silicone resin, 6 parts of siloxane, 1 part of organic acid catalyst, 100 parts of organic solvent, 2 parts of water, 15 parts of inorganic salt, 100 parts of allyl polyether, and 1 part of platinum catalyst.

[0084] Furthermore, the organic silicone resin is methyl MQ silicone resin, and the M / Q value of the methyl MQ silicone resin is 0.9.

[0085] Furthermore, the siloxane is tetramethyldisiloxane.

[0086] Furthermore, the organic acid catalyst is trifluoromethanesulfonic acid.

[0087] Furthermore, the organic solvent is dimethylformamide.

[0088] Furthermore, the platinum catalyst is a composition of platinum black, platinum asbestos and platinum silicon, and the mass ratio thereof is 3:1.5:2.2.

[0089] Furthermore, the inorganic salt is NaHCO3.

[0090] A method for preparing the above-mentioned low surface tension surfactant comprises the following steps:

[0091] (1) mixing a formulated amount of an organosilicon resin and a formulated amount of a siloxane, and then stirring to obtain a mixed solution;

[0092] (2) adding a formula amount of an organic acid catalyst and a formula amount of water to the mixed solution obtained in step (1) and mixing them evenly, stirring for a period of time to complete a first reaction, and obtaining a first reaction solution after the reaction is completed, and then adding a formula amount of an organic solvent to the mixed solution and stirring, and continuing a second reaction, and after the reaction is completed, cooling to room temperature to obtain a second reaction solution;

[0093] (3) adding a formulated amount of inorganic salt to the second reaction solution obtained in step (2), stirring and filtering, taking the filtrate, and then boiling at 50° C. to obtain a low-boiling substance;

[0094] (4) mixing the low boiling point product obtained in step (3) with a formulated amount of allyl polyether and a formulated amount of platinum catalyst for reaction, and obtaining a surfactant with low surface tension after the reaction is completed.

[0095] Furthermore, the stirring temperature in step (1) is 50° C. and the stirring time is 30 min.

[0096] Furthermore, in step (2), the reaction temperature of the first reaction is 75° C. and the reaction time is 5 h.

[0097] Furthermore, in step (2), the reaction temperature of the second reaction is 55° C., and the reaction time is 0.8 h.

[0098] Furthermore, the mass fraction of Si-H groups in the low boiling point product in step (3) is 6%.

[0099] Furthermore, the reaction temperature in step (4) is room temperature and the reaction time is 2 h.

[0100] Example 5-11

[0101] It is almost the same as Example 1, except that the silicone resin is different:

[0102]

[0103]

[0104] Examples 12-15

[0105] The same as Example 1, the only difference is that the siloxane is different

[0106] Examples 16-24

[0107] The same as Example 1, the only difference is that the organic solvent is different

[0108]

[0109] Examples 25-34

[0110] The same as Example 1, the only difference is that the platinum catalyst is different:

[0111]

[0112]

[0113] Examples 35-38

[0114] The same as Example 1, the only difference is that the inorganic salt is different

[0115] Inorganic salt Embodiment 35 <![CDATA[NaHCO3, Na2CO3, KHCO3, K2CO with equal mass ratios 3的 mixture]]> Embodiment 36 <![CDATA[Na2CO3]]> Embodiment 37 <![CDATA[KHCO3]]> Embodiment 38 <![CDATA[K2CO3]]>

[0116] Comparative Example 1

[0117] The specific implementation of this comparative example is different from that of Example 1 in that the silicone resin is polyethyl silicone resin purchased from Changzhou Jianuo Silicone Co., Ltd.

[0118] Comparative Example 2

[0119] The specific implementation of this comparative example is different from that of Example 1 in that:

[0120] 1. Different ratios of raw materials:

[0121] The raw materials of the low surface tension surfactant include: 105 parts of silicone resin, 6 parts of siloxane, 0.3 parts of organic acid catalyst, 80 parts of organic solvent, 0.4 parts of water, 6.5 parts of inorganic salt, 70 parts of allyl polyether and 0.45 parts of platinum catalyst.

[0122] 2. Different silicone resins are used:

[0123] The organic silicone resin is methyl MQ silicone resin with an M / Q value of 0.6, which was purchased from Yantai Shunming New Materials Co., Ltd.

[0124] Performance Testing Methods

[0125] 1. Surface tension: The ability of the low surface tension surfactants obtained in Examples 1 to 4 and Comparative Examples 1 to 2 to reduce surface tension was measured. The obtained surfactants were mixed with water to prepare a 0.1 wt% surfactant solution. The test method was based on GB / T 22237-2008 "Determination of Surface Tension of Surfactants" to test the surfactant solution. The measured data are recorded in Table 1.

[0126] 2. Emulsifying power: The emulsifying power of the low surface tension surfactants obtained in Examples 1 to 4 and Comparative Examples 1 to 2 was measured according to the test method in accordance with GB / T 6369-86 “Colorimetric method for determination of emulsifying power of surfactants”. The measured data are recorded in Table 1.

[0127] Table 1

[0128] Surface tension (mN / m) Emulsifying power (%) Example 1 17 72.3 Example 2 23 83.4 Example 3 24 84.6 Example 4 21 80.1 Comparative Example 1 37 86.1 Comparative Example 2 42 88.5

[0129] The above describes the embodiments of the present invention in detail. However, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A surfactant with low surface tension, characterized in that: In parts by weight, it is composed of the following components: 100-130 parts of silicone resin, 4-6 parts of siloxane, 0.1-1 parts of organic acid catalyst, 80-100 parts of organic solvent, 0.5-2 parts of water, 8-15 parts of inorganic salt, 75-100 parts of allyl polyether, and 0.5-1 part of platinum catalyst.

2. A surfactant with low surface tension as claimed in claim 1, characterized in that: The organic silicone resin is at least one of polymethyl silicone resin, methyl MQ silicone resin, polyaryl organic silicone resin and polyalkylaryl organic silicone resin.

3. A surfactant with low surface tension as claimed in claim 2, characterized in that: The organic silicone resin is a methyl MQ silicone resin, and the M / Q value of the methyl MQ silicone resin is 0.7 to 1.6, preferably 0.

9.

4. A surfactant with low surface tension as claimed in claim 1, characterized in that: The siloxane is at least one of tetramethyldisiloxane, trimethoxysilane, methyltriethoxysilane and dimethyldiethoxysilane, preferably tetramethyldisiloxane.

5. A surfactant with low surface tension as claimed in claim 1, characterized in that: The organic acid catalyst is trifluoromethanesulfonic acid.

6. A low surface tension surfactant as claimed in claim 1, characterized in that: The organic solvent is at least one of ethyl acetate, methyl formate, dimethylformamide, dimethylacetamide, toluene, ethanol, acetone, methyl ethyl ketone and cyclohexanone, preferably dimethylformamide.

7. A low surface tension surfactant as claimed in claim 1, characterized in that: The platinum catalyst is at least one of platinum chloride, platinum black, chloroplatinic acid hydrate, platinum asbestos, chelated platinum complex, platinum silicon, and sulfur-platinum complex.

8. A low surface tension surfactant as claimed in claim 7, characterized in that: The platinum catalyst is a composition of platinum black, platinum asbestos and platinum silicon, and the mass ratio thereof is (1-5): (1-3): (1-3), preferably 3:1.5:2.

2.

9. A low surface tension surfactant as claimed in claim 1, characterized in that: The inorganic salt is at least one of a sodium salt and a potassium salt.

10. A low surface tension surfactant as claimed in claim 9, characterized in that: The inorganic salt is at least one of NaHCO3, Na2CO3, KHCO3, and K2CO3, preferably NaHCO3.

11. A method for preparing a surfactant with low surface tension according to any one of claims 10 to 10, characterized in that: The following steps are involved: (1) mixing a formulated amount of an organosilicon resin and a formulated amount of a siloxane, and then stirring to obtain a mixed solution; (2) adding a formula amount of an organic acid catalyst and a formula amount of water to the mixed solution obtained in step (1) and mixing them evenly, stirring for a period of time to complete a first reaction, and obtaining a first reaction solution after the reaction is completed, and then adding a formula amount of an organic solvent to the mixed solution and stirring, and continuing a second reaction, and after the reaction is completed, cooling to room temperature to obtain a second reaction solution; (3) Continue to add a formulated amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly, filter, take the filtrate, and then boil at 40 to 50° C. to obtain a low-boiling substance; (4) mixing the low boiling point product obtained in step (3) with a formulated amount of allyl polyether and a formulated amount of platinum catalyst for reaction, and obtaining a surfactant with low surface tension after the reaction is completed.

12. The method for preparing a surfactant with low surface tension according to claim 11, characterized in that: The stirring temperature in step (1) is 40-50° C., and the stirring time is 30-45 min.

13. The method for preparing a surfactant with low surface tension according to claim 11, characterized in that: The reaction temperature of the first reaction in step (2) is 65-75° C., and the reaction time is 5-8 h.

14. The method for preparing a surfactant with low surface tension according to claim 11, characterized in that: The reaction temperature of the second reaction in step (2) is 45-55° C., and the reaction time is 0.8-1.2 h.

15. The method for preparing a surfactant with low surface tension according to claim 11, characterized in that: The mass fraction of Si-H groups in the low boiling point product in step (3) is 0.1% to 6%.

16. The method for preparing a surfactant with low surface tension according to claim 11, characterized in that: The reaction temperature in step (4) is room temperature and the reaction time is 1 to 2 hours.

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