A low surface tension surfactant and its preparation method

Abstract

This invention discloses a low surface tension surfactant, which, by weight, comprises the following components: 100-130 parts of organosilicon 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 parts of platinum catalyst. This invention also discloses a method for preparing the low surface tension surfactant. The low surface tension surfactant disclosed in this invention significantly reduces the surface tension of liquids, improves their fluidity and leveling properties, enhances the lubrication and gloss of the surfactant, and possesses defoaming and antifoaming functions.

Description

Technical Field

[0001] This invention relates to the field of surfactant technology, and more specifically to a low surface tension surfactant and its preparation method. Background Technology

[0002] Oil is an important energy source for the development of the world economy. Since the 1970s, oil has surpassed coal to become the largest component of global energy consumption, and global oil consumption continues to increase.

[0003] With the continuous extraction and consumption of conventional crude oil, over the past century, humanity has depleted more than 45% of the recoverable reserves of light oil, leaving only approximately 150 billion tons of recoverable conventional crude oil reserves. Due to its high viscosity and poor fluidity, heavy oil remains trapped in the pores of rock formations, posing significant challenges to its extraction and drastically reducing its recovery rate. To address this issue, various methods have been developed to extract the remaining large quantities of viscous heavy oil. For example, a large amount of chemical substances are added during the extraction process, including a variety of surfactants. These surfactants reduce the surface tension between the crude oil and the interface, decrease the adsorption of oil by the rock formation, and improve fluidity, thereby further increasing the recovery rate.

[0004] Chinese invention patent application CN112206716A discloses a low-surface-tension hydrocarbon surfactant and its preparation method. The low-surface-tension hydrocarbon surfactant comprises, by mass percentage: 35-45% sodium fatty alcohol ether sulfate, 15-25% dodecyl dimethylamine oxide, 15-30% sodium dodecylbenzenesulfonate, 0-10% dodecyl trimethylammonium chloride, and 10-20% ethanol. The positively charged surfactant added in this invention is mainly dodecyl dimethylamine oxide. Dodecyl dimethylamine oxide can be used as a cationic surfactant under neutral or acidic conditions and as a nonionic surfactant under alkaline conditions. Experiments have shown that dodecyl dimethylamine oxide does not produce turbidity when compounded with anionic surfactants, but its ability to reduce surface tension is comparable to that of a cationic-anionic compound.

[0005] Chinese invention patent CN1129469C discloses a petroleum carboxylate surfactant, its preparation method, and its application in tertiary oil recovery. This invention synthesizes petroleum carboxylate through an oxidation reaction. The raw materials are widely available, the preparation cost is low, and the product performance is stable. When this petroleum carboxylate is compounded with other surfactants, it has a good synergistic effect. Core flooding tests on its compound system can significantly reduce water content, concentrate oil production, form oil-rich zones, and increase the average recovery rate by 20% OOIP compared to water flooding. However, the invention is not effective when used alone and needs to be compounded with other surfactants. Furthermore, its ability to reduce surface tension is insufficient.

[0006] Although the surfactants disclosed in the above technical solutions have good water solubility, they all have the following shortcomings: insufficient ability to reduce surface tension and limited application range of the surfactants produced. 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 its preparation method.

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

[0009] The composition includes 100-130 parts of organosilicon 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 parts 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 silicone resin is methyl MQ silicone resin, and the M / Q value of the methyl MQ silicone resin is 0.7 to 1.6.

[0012] Furthermore, the silicone resin is a 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 selected from 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, chelated platinum complex, platinum silicon, and sulfoplatinum complex.

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

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

[0019] Furthermore, the inorganic salt is at least one of NaHCO3, Na2CO3, KHCO3, and K2CO3, with NaHCO3 being preferred.

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

[0021] (1) Mix the prescribed amount of organosilicon resin and the prescribed amount of siloxane, and then stir to obtain a mixture;

[0022] (2) Add the formula amount of organic acid catalyst and the formula amount of water to the mixture obtained in step (1), mix evenly, stir for a period of time to complete the first reaction, and after the reaction is completed, the first reaction solution is obtained. Then add the formula amount of organic solvent to it and stir to continue the second reaction. After the reaction is completed, cool to room temperature to obtain the second reaction solution.

[0023] (3) Continue to add the prescribed amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly and filter, take the filtrate, and then cook it at 40-50℃ to obtain a low-boiling product.

[0024] (4) The low-boiling product obtained in step (3) is mixed with the formulated amount of allyl polyether and the formulated amount of platinum catalyst and reacted. After the reaction is completed, a surfactant with low surface tension is obtained.

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

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

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

[0028] Furthermore, the mass fraction of Si-H groups in the low-boiling material described 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 its preparation method disclosed in this invention have the following beneficial effects:

[0031] This invention improves the compatibility of the components in the mixture by selectively adding methyl MQ silicone resin with a specific M / Q value to interact with siloxanes. This not only enhances the compatibility of the components but also affects the strength of the ionic bonds between the methyl MQ silicone resin and the siloxanes, thus influencing the physical properties of the system and improving its rheological properties. The added methyl MQ silicone resin has a small molecular weight, and the addition of dense allyl polyether forms a crosslink with the methyl MQ silicone resin, leading to a strong chemical fusion with the siloxane. This reduces inward molecular movement, increases surface molecular density, shortens the effective distance between molecules, weakens intermolecular attraction, and reduces surface tension. This significantly reduces the decrease in surface tension of the surfactant system, improves its fluidity and leveling properties, enhances the lubrication and gloss of the surfactant, and provides defoaming and antifoaming effects. Detailed 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 herein 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 the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0034] This invention improves the compatibility of the components in the mixture by selectively adding methyl MQ silicone resin with a specific M / Q value, thereby affecting the physical properties of the system and improving the rheological properties of the liquid. Specifically, when M / Q = 0.9, the methyl MQ silicone resin and the siloxane exhibit slight phase separation, with the methyl MQ silicone resin as the dispersed phase. This dispersed phase is small in size and relatively uniformly dispersed, improving both the degree of dispersion and the compatibility of the methyl MQ silicone resin with other components in the system, thus increasing the reaction efficiency.

[0035] The mass ratio of the added methyl MQ silicone resin to siloxane and allyl polyether is (100-130): (4-6): (75-100). The methyl MQ silicone resin has a small molecular weight. The added dense allyl polyether forms a cross-link with the methyl MQ silicone resin, and then forms a strong chemical fusion with the siloxane. The inward movement of molecules is weakened, the surface molecular density increases, the effective distance between molecules becomes shorter, the intermolecular attraction weakens, and the surface "tightness" is reduced. This significantly reduces the decrease in the liquid surface tension of the surfactant system, improves its fluidity and leveling properties, enhances the lubrication and emulsification ability of the surfactant, and has the functions of defoaming and foam reduction.

[0036] The allyl polyethers (CAS No.: 27274-31-3) used in this application were all purchased from Liaoning Kelong Fine Chemical Co., Ltd., and the specification was APEG-1000.

[0037] Example 1

[0038] A low surface tension surfactant, by weight, comprises the following raw materials: 120 parts of organosilicon 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 silicone resin is methyl MQ silicone resin, with an M / Q value of 0.9. The methyl MQ silicone resin was purchased from Yantai Shunming New Materials Co., Ltd.

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

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

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

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

[0044] The platinum catalyst is a composition of platinum black, platinum asbestos, and platinum silicon, with a mass ratio of platinum black, platinum asbestos, and platinum silicon of 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 includes the following steps:

[0047] (1) Mix the prescribed amount of organosilicon resin and the prescribed amount of siloxane, and then stir to obtain a mixture;

[0048] (2) Add the formula amount of organic acid catalyst and the formula amount of water to the mixture obtained in step (1), mix evenly, stir for a period of time to complete the first reaction, and after the reaction is completed, the first reaction solution is obtained. Then add the formula amount of organic solvent to it and stir to continue the second reaction. After the reaction is completed, cool to room temperature to obtain the second reaction solution.

[0049] (3) Continue to add the prescribed amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly and filter, take the filtrate, and then cook at 45°C to obtain a low-boiling product.

[0050] (4) The low-boiling product obtained in step (3) is mixed with the formulated amount of allyl polyether and the formulated amount of platinum catalyst and reacted. After the reaction is completed, a surfactant with low surface tension is obtained.

[0051] Furthermore, in step (1), the stirring temperature 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 hours.

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

[0054] Furthermore, the mass fraction of Si-H groups in the low-boiling material described 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 largely the same as Example 1, except that:

[0058] 1. Different raw material ratios:

[0059] The raw materials for the low surface tension surfactant include: 100 parts of organosilicon 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 silicone resin is methyl MQ silicone resin, with an M / Q value of 0.8. The methyl MQ silicone resin was purchased from Yantai Shunming New Materials Co., Ltd.

[0062] Example 3

[0063] A low surface tension surfactant, comprising, by weight, the following components:

[0064] The composition includes 100 parts of organosilicon 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 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 in a mass ratio of 3:1.5:2.2.

[0070] Furthermore, the inorganic salt is NaHCO3.

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

[0072] (1) Mix the prescribed amount of organosilicon resin and the prescribed amount of siloxane, and then stir to obtain a mixture;

[0073] (2) Add the formula amount of organic acid catalyst and the formula amount of water to the mixture obtained in step (1), mix evenly, stir for a period of time to complete the first reaction, and after the reaction is completed, the first reaction solution is obtained. Then add the formula amount of organic solvent to it and stir to continue the second reaction. After the reaction is completed, cool to room temperature to obtain the second reaction solution.

[0074] (3) Continue to add the prescribed amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly and filter, take the filtrate, and then cook it at 40°C to obtain a low-boiling product.

[0075] (4) The low-boiling product obtained in step (3) is mixed with the formulated amount of allyl polyether and the formulated amount of platinum catalyst and reacted. After the reaction is completed, a surfactant with low surface tension is obtained.

[0076] Furthermore, in step (1), the stirring temperature 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 hours.

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

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

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

[0081] Example 4

[0082] A low surface tension surfactant, comprising, by weight, the following components:

[0083] The composition includes 130 parts of organosilicon 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 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 in a mass ratio of 3:1.5:2.2.

[0089] Furthermore, the inorganic salt is NaHCO3.

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

[0091] (1) Mix the prescribed amount of organosilicon resin and the prescribed amount of siloxane, and then stir to obtain a mixture;

[0092] (2) Add the formula amount of organic acid catalyst and the formula amount of water to the mixture obtained in step (1), mix evenly, stir for a period of time to complete the first reaction, and after the reaction is completed, the first reaction solution is obtained. Then add the formula amount of organic solvent to it and stir to continue the second reaction. After the reaction is completed, cool to room temperature to obtain the second reaction solution.

[0093] (3) Continue to add the prescribed amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly and filter, take the filtrate, and then cook at 50°C to obtain a low-boiling product.

[0094] (4) The low-boiling product obtained in step (3) is mixed with the formulated amount of allyl polyether and the formulated amount of platinum catalyst and reacted. After the reaction is completed, a surfactant with low surface tension is obtained.

[0095] Furthermore, in step (1), the stirring temperature 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 hours.

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

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

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

[0100] Examples 5-11

[0101] Similar to Example 1, except for the silicone resin:

[0102]

[0103]

[0104] Examples 12-15

[0105] Similar to Example 1, except for the different siloxane.

[0106] Examples 16-24

[0107] Similar to Example 1, except for the different organic solvent.

[0108]

[0109] Examples 25-34

[0110] Similar to Example 1, except for the platinum catalyst:

[0111]

[0112]

[0113] Examples 35-38

[0114] Similar to Example 1, except for the different inorganic salts.

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

[0116] Comparative Example 1

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

[0118] Comparative Example 2

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

[0120] 1. Different raw material ratios:

[0121] The raw materials for the low surface tension surfactant include: 105 parts of organosilicon 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 silicone resin is methyl MQ silicone resin with an M / Q value of 0.6, 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 1-4 and Comparative Examples 1-2 to reduce surface tension was determined. The prepared surfactants were mixed with water to form a 0.1 wt% surfactant solution. The test method was in accordance with GB / T 22237-2008 "Determination of surface tension of surfactants". The measured data were recorded in Table 1.

[0126] 2. Emulsifying power: The emulsifying power of the low surface tension surfactants obtained in Examples 1-4 and Comparative Examples 1-2 was determined. The test method was based on GB / T 6369-86 "Determination of Emulsifying Power of Surfactants - Colorimetric Method". The measured data were 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 embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A surfactant with low surface tension, characterized in that, It consists of the following components in parts by weight: The composition includes: 100-130 parts organosilicon resin, 4-6 parts siloxane, 0.1-1 parts organic acid catalyst, 80-100 parts organic solvent, 0.5-2 parts water, 8-15 parts inorganic salt, 75-100 parts allyl polyether, and 0.5-1 parts platinum catalyst, wherein: The silicone resin is methylMQ silicone resin, and the M / Q value of the methylMQ silicone resin is 0.7 to 1.6; The siloxane is tetramethyldisiloxane; The inorganic salt is at least one of sodium salt and potassium salt.

2. The low surface tension surfactant as described in claim 1, characterized in that, The silicone resin is methylMQ silicone resin, and the M / Q value of the methylMQ silicone resin is 0.

9.

3. A low surface tension surfactant as described in claim 1, characterized in that, The organic acid catalyst is trifluoromethanesulfonic acid.

4. A low surface tension surfactant as described in claim 1, characterized in that, The organic solvent is at least one selected from ethyl acetate, methyl formate, dimethylformamide, dimethylacetamide, toluene, ethanol, acetone, methyl ethyl ketone, and cyclohexanone.

5. A low surface tension surfactant as described in claim 4, characterized in that, The organic solvent is dimethylformamide.

6. A low surface tension surfactant as described 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 complexes, platinum-silicon complexes, and platinum-sulfur complexes.

7. A low surface tension surfactant as described in claim 6, characterized in that, The platinum catalyst is a composition of platinum black, platinum asbestos, and platinum silicon in a mass ratio of (1-5):(1-3):(1-3).

8. A low surface tension surfactant as described in claim 7, characterized in that, The platinum catalyst is a composition of platinum black, platinum asbestos, and platinum silicon in a mass ratio of 3:1.5:2.

2.

9. A low surface tension surfactant as described in claim 1, characterized in that, The inorganic salt is at least one of NaHCO3, Na2CO3, KHCO3, and K2CO3.

10. A low surface tension surfactant as described in claim 9, characterized in that, The inorganic salt is NaHCO3.

11. A method for preparing a low surface tension surfactant according to any one of claims 1-10, characterized in that, Includes the following steps: (1) Mix the prescribed amount of organosilicon resin with the prescribed amount of siloxane, and then stir to obtain a mixture; (2) Add the formula amount of organic acid catalyst and the formula amount of water to the mixture obtained in step (1), mix evenly, stir for a period of time to complete the first reaction, and after the reaction is completed, the first reaction solution is obtained. Then add the formula amount of organic solvent to it and stir to continue the second reaction. After the reaction is completed, cool to room temperature to obtain the second reaction solution. (3) Continue to add the prescribed amount of inorganic salt to the second reaction solution obtained in step (2), stir evenly and filter, take the filtrate, and then cook it at 40-50℃ to obtain a low-boiling product; (4) The low-boiling product obtained in step (3) is mixed with the formulated amount of allyl polyether and the formulated amount of platinum catalyst and reacted. After the reaction is completed, a surfactant with low surface tension is obtained.

12. The method for preparing a low surface tension surfactant as described in claim 11, characterized in that, In step (1), the stirring temperature is 40-50℃ and the stirring time is 30-45 min.

13. The method for preparing a low surface tension surfactant as described in claim 11, characterized in that, In step (2), the reaction temperature of the first reaction is 65-75℃ and the reaction time is 5-8h.

14. The method for preparing a low surface tension surfactant as described in claim 11, characterized in that, In step (2), the reaction temperature of the second reaction is 45-55℃ and the reaction time is 0.8-1.2h.

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

16. The method for preparing a low surface tension surfactant as described in 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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