A surfactant and its preparation method and a gemini surfactant type water-based oil stain cleaning agent

Abstract

The application provides a surfactant, a preparation method thereof and a gemini surfactant type water-based oil stain cleaning agent. The preparation method comprises the following steps: 1 part of 4,4'-dihydroxydiphenyl methane, 2-7 parts of potassium hydroxide and ethylene oxide are reacted at 130-140 DEG C under a pressure of 0.22+ / -0.02 MPa to obtain an intermediate product A; the intermediate product A is reacted with propylene oxide at 130-140 DEG C under a pressure of 0.22+ / -0.02 MPa to obtain an intermediate product B; the intermediate product B is reacted with ethylene oxide at 130-140 DEG C under a pressure of 0.22+ / -0.02 MPa to obtain polyether C; the polyether C, potassium hydroxide and sodium chloroacetate are reacted at 80-85 DEG C to obtain product D, namely the surfactant. The gemini surfactant type oil stain cleaning agent is a solution prepared from the surfactant. The oil stain cleaning agent has the advantages of high cleaning power, good corrosion and rust prevention performance, good stability and good defoaming performance.

Description

Technical Field

[0001] This invention belongs to the field of oilfield chemical technology, specifically relating to a surfactant, its preparation method, and a gemini surfactant-type water-based oil stain cleaner. Background Technology

[0002] With the development of society, it's difficult to avoid oil stains and grease when using metal materials. If left untreated for a long time, these stains will corrode the metal, shorten its lifespan, and cause economic losses. Previously, petroleum-based and alcohol-based solvent-based cleaning agents were commonly used to remove oil stains. However, this method is unsafe, flammable, explosive, costly, and environmentally polluting. With industrial needs and technological advancements, water-based oil stain cleaners have emerged. Compared to solvent-based cleaners, water-based cleaners are safer, more stable, have better cleaning effects, lower costs, and less environmental pollution, making them increasingly popular.

[0003] Water-based oil stain cleaners primarily utilize surfactants. In recent years, surfactants have become increasingly prevalent in various fields, leading to in-depth research on this class of substances. A surfactant is a molecule with one hydrophilic end and one lipophilic end, possessing properties such as emulsification, penetration, wetting, dispersion, chelation, and saponification. When a water-based oil stain cleaner encounters dirt and metal surfaces, the lipophilic end penetrates the oil stains, wetting the metal surface. Then, under mechanical force, the oil stains are removed from the metal surface. In recent years, with strong national requirements and promotion of environmental protection, enterprises have become increasingly concerned about environmental pollution. Water-based oil stain cleaners, with their excellent performance, lower cost, and less environmental and human pollution, have gradually replaced solvent-based cleaners, becoming the main cleaning agent in industrial cleaning, and are expected to have a promising future. Summary of the Invention

[0004] The purpose of this invention is to provide a surfactant and a gemini surfactant-type oil stain cleaner made therefrom. This oil stain cleaner has advantages such as high cleaning power, good corrosion and rust prevention properties, good stability, and good defoaming properties.

[0005] To achieve the above objectives, the present invention provides a method for preparing a surfactant, comprising the following steps (all parts are by weight):

[0006] (1) Add 1 part of 4,4'-dihydroxydiphenylmethane and 2-7 parts of potassium hydroxide to the reactor, replace the air in the reactor with a protective gas and evacuate to a vacuum, heat to 115-125℃, add ethylene oxide, raise the temperature to 130-140℃, control the reaction pressure at 0.22±0.02MPa, and obtain intermediate product A after the reaction is completed;

[0007] (2) When the temperature inside the reactor drops to 115-125℃, add propylene oxide, raise the temperature to 130-140℃, control the reaction pressure at 0.22±0.02MPa, and obtain intermediate product B after the reaction is completed;

[0008] (3) When the temperature inside the reactor drops to 115-125℃, add ethylene oxide, raise the temperature to 130-140℃, control the reaction pressure at 0.22±0.02MPa, and after the reaction is completed, cool down and open the reactor to obtain polyether C;

[0009] (4) Heat 90 parts of polyether C to 50-60°C, add 1-2 parts of potassium hydroxide, then heat to 60-70°C, and dropwise add an aqueous solution of sodium chloroacetate (preferably with a mass concentration of 30%), wherein the solute sodium chloroacetate is 8-12 parts, and the sodium chloroacetate aqueous solution is added dropwise over 3-5 hours. After the addition is complete, maintain the reaction temperature at 80-85°C and allow the reaction to proceed fully (preferably 8-9 hours). After the temperature drops to room temperature, allow it to stand (preferably 0.5-1 hours) to obtain product D, i.e., surfactant.

[0010] In the above preparation method, preferably, the vacuuming is performed by evacuating the reactor to a pressure of -0.09 MPa or lower.

[0011] In the above preparation method, preferably, in step (1), after adding ethylene oxide and the pressure in the reactor drops, the material in the reactor reacts for another 30-40 minutes. When the pressure in the reactor reaches -0.09 MPa or lower, intermediate product A is obtained.

[0012] In the above preparation method, preferably, in step (2), after adding propylene oxide and the pressure in the reactor drops, the material in the reactor reacts for another 30-40 minutes. When the pressure in the reactor reaches -0.09 MPa or lower, intermediate product B is obtained.

[0013] In the above preparation method, preferably, in step (3), after adding ethylene oxide and the pressure in the reactor drops, the material in the reactor reacts for another 30-40 minutes. When the pressure in the reactor reaches -0.09 MPa or lower, polyether C is obtained.

[0014] In the above preparation method, preferably, in step (1), the amount of potassium hydroxide added is 2.4-6.24 parts, more preferably 2.4 parts, 3.84 parts or 6.24 parts.

[0015] In the above preparation method, preferably, in step (1), the protective gas is nitrogen.

[0016] In the above preparation method, preferably, in step (1), the heating temperature before adding ethylene oxide is 120°C, and the heating temperature after adding ethylene oxide is 140°C.

[0017] In the above preparation method, preferably, in step (2), the heating temperature before adding propylene oxide is 120°C, and the heating temperature after adding ethylene oxide is 140°C.

[0018] In the above preparation method, preferably, in step (3), the heating temperature before adding ethylene oxide is 120°C, and the heating temperature after adding ethylene oxide is 140°C.

[0019] In the above preparation method, preferably, in step (1), the amount of ethylene oxide added is 99-259 parts, preferably 99 parts, 159 parts or 259 parts.

[0020] In the above preparation method, preferably, in step (2), the amount of propylene oxide added is 200-520 parts, preferably 200 parts, 320 parts or 520 parts.

[0021] In the above preparation method, preferably, in step (3), the amount of ethylene oxide added is 100-260 parts, preferably 100 parts, 160 parts or 260 parts.

[0022] In the above preparation method, preferably, in step (4), the amount of potassium hydroxide added is 1.17-1.35 parts, more preferably 1.17 parts.

[0023] In the above preparation method, preferably, in step (4), the solute sodium chloroacetate is 10-12 parts, more preferably 10 parts.

[0024] In the above preparation method, preferably, the concentration of the solution prepared from product D is 40%-60%, more preferably 50%. According to a specific embodiment of the present invention, the above preparation method can be carried out according to the following specific steps:

[0025] (1) Prepare a high-pressure reactor. Add 1 part of 4,4'-dihydroxydiphenylmethane and 2.4-6.24 parts of potassium hydroxide catalyst to the reactor. After the addition is complete, close and seal the reactor. Use N2 to replace the air in the reactor, and then evacuate the reactor to a vacuum. The pressure reading of the reactor is -0.09 MPa. Then heat the reactor to 115-125℃, open the feed valve, and slowly add 99-259 parts of ethylene oxide to the reactor. After the ethylene oxide is added, close the feed valve. Raise the temperature of the reactor to 130-140℃ and control the reaction pressure to 0.22±0.02 MPa. After the pressure in the reactor drops, let the material in the reactor react for another 30-40 minutes until the pressure reading of the reactor is -0.09 MPa. The reaction ends when the pressure reading of the reactor is -0.09 MPa, and intermediate product A is obtained.

[0026] (2) When the temperature inside the reactor drops to 115-125℃, open the feed valve and slowly add 200-520 parts of propylene oxide. After the addition is complete, close the feed valve and raise the temperature of the reactor to 130-140℃, controlling the reaction pressure at 0.22±0.02MPa. After the pressure inside the reactor drops, let the material in the reactor react for another 30-40 minutes until the pressure reading of the reactor is -0.09MPa, at which point intermediate product B is obtained.

[0027] (3) When the temperature inside the reactor drops to 115-125℃, open the feed valve and slowly add 100-260 parts of ethylene oxide. After the addition is complete, close the feed valve and raise the temperature of the reactor to 130-140℃, controlling the reaction pressure to 0.22±0.02MPa. After the pressure inside the reactor drops, let the material inside the reactor react for another 30-40 minutes until the pressure reading of the reactor is -0.09MPa. The reaction is then complete. Cool down and open the reactor to obtain polyether C.

[0028] The process of steps (1)-(3) is shown in reaction formula I:

[0029]

[0030] (4) As shown in reaction formula II. Prepare a three-necked flask, add 90 parts of polyether C to the flask, heat the water bath to 50-60℃, add 1.17-1.35 parts of potassium hydroxide catalyst, then heat to 60-70℃, and slowly add a 30% aqueous solution of sodium chloroacetate to the three-necked flask, of which the solute sodium chloroacetate is 10 parts, and the sodium chloroacetate aqueous solution is added dropwise over 3-5 hours. After the addition is complete, maintain the reaction temperature at 80-85℃ and react fully for 8-9 hours. After the temperature inside the flask drops to room temperature, let it stand for 0.5-1 hours to obtain product D, i.e., surfactant.

[0031]

[0032] in:

[0033]

[0034] The present invention also provides a surfactant prepared by the above method, which is a gemini surfactant.

[0035] The present invention also provides a gemini surfactant-based oil stain cleaner, which is a solution made from the aforementioned surfactant. For example, deionized water is added to product D to prepare an aqueous solution of product D, thereby preparing a gemini surfactant-based oil stain cleaner. Preferably, the concentration of the solution is 50%.

[0036] Compared with conventional cleaning agents sold on the market, the gemini surfactant-type oil stain cleaner described in this invention has the following superior effects:

[0037] (1) Since nonionic surfactants have a low cloud point, the present invention can increase the cloud point of the surfactant by modifying it to anionize it through a modification reaction, thereby giving it better cleaning ability.

[0038] (2) The bimolecular anionic surfactant of the present invention also has better water solubility, and therefore lower cost;

[0039] (3) The twin surfactant type oil stain cleaner of the present invention also has the characteristics of good corrosiveness and rust prevention, and can play a better role in removing dirt on metal surfaces. Detailed Implementation

[0040] To illustrate the invention in detail, specific embodiments will be used below. However, the scope of application of this invention is not limited to the following embodiments. Actual use will be implemented according to specific circumstances.

[0041] Example 1

[0042] This embodiment provides a gemini surfactant-based oil stain cleaner, which is prepared through the following steps:

[0043] Prepare a high-pressure reactor. Add 1g of 4,4'-dihydroxydiphenylmethane and 2.4g of potassium hydroxide to the reactor and seal it. Displace the air from the reactor with nitrogen, then evacuate the reactor to a vacuum, bringing the pressure reading to -0.09MPa. Heat the reactor to 120℃, open the feed valve, and slowly add 99g of ethylene oxide. After the addition is complete, close the feed valve. Raise the reactor temperature to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, allow the materials to react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding intermediate product A1.

[0044] Lower the reactor temperature to 120℃, open the feed valve, and slowly add 200g of propylene oxide to the reactor. After the addition is complete, close the feed valve. Raise the reactor temperature to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, allow the materials in the reactor to react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding intermediate product B1.

[0045] Open the feed valve and slowly add 100g of ethylene oxide into the reactor. After the addition is complete, close the feed valve. Heat the reactor to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, allow the materials in the reactor to react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding polyether C1.

[0046] Prepare a three-necked flask and add 9g of polyether C1. Heat the flask to 60°C in a water bath, then add 0.12g of potassium hydroxide. Increase the temperature to 70°C and slowly add 3.33g of a 30% aqueous solution of sodium chloroacetate dropwise over 4 hours. After the addition is complete, maintain the temperature at 80°C and allow the reaction to proceed for 8 hours. Then, allow the flask to return to room temperature and let it stand for another 1 hour to obtain product D1. Finally, add 7.67g of deionized water to product D1 to prepare a 50% aqueous solution, thus creating a Gemini surfactant-type oil stain cleaner, labeled as sample 1.

[0047] Example 2

[0048] This embodiment provides a gemini surfactant-based oil stain cleaner, which is prepared through the following steps: A high-pressure reactor is prepared, and 1g of 4,4'-dihydroxydiphenylmethane and 3.84g of potassium hydroxide are added to the reactor, which is then sealed. The air in the reactor is replaced with nitrogen, and then the reactor is evacuated to a vacuum, with a pressure reading of -0.09MPa. The reactor is heated to 120°C, the feed valve is opened, and 159g of ethylene oxide is slowly added to the reactor. After the addition is complete, the feed valve is closed. The reactor temperature is raised to 140°C, and the reaction pressure is controlled at 0.22MPa. After the reactor pressure drops, the materials in the reactor react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding intermediate product A2.

[0049] Lower the reactor temperature to 120℃, open the feed valve, and slowly add 320g of propylene oxide to the reactor. After the addition is complete, close the feed valve. Raise the reactor temperature to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, allow the materials in the reactor to react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding intermediate product B2.

[0050] Open the feed valve and slowly add 160g of ethylene oxide into the reactor. After the addition is complete, close the feed valve. Heat the reactor to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, let the materials in the reactor react for another 35 minutes until the pressure reading is -0.09MPa, to obtain polyether C2.

[0051] Prepare a three-necked flask and add 9g of polyether C2. Heat the flask in a water bath to 60°C, then add 0.12g of potassium hydroxide. Increase the temperature to 70°C and slowly add 3.33g of a 30% aqueous solution of sodium chloroacetate dropwise over 4 hours. After the addition is complete, maintain the temperature at 80°C and allow the reaction to proceed for 8 hours. Then, allow the flask to return to room temperature and let it stand for another 1 hour to obtain product D2. Finally, add 7.67g of deionized water to product D2 to prepare a 50% aqueous solution, thus creating a Gemini surfactant-type oil stain cleaner, labeled as sample 2.

[0052] Example 3

[0053] This embodiment provides a gemini surfactant-based oil stain cleaner, which is prepared through the following steps: A high-pressure reactor is prepared, and 1g of 4,4'-dihydroxydiphenylmethane and 6.24g of potassium hydroxide are added to the reactor, which is then sealed. The air in the reactor is replaced with nitrogen, and then the reactor is evacuated to a vacuum, with a pressure reading of -0.09MPa. The reactor is heated to 120°C, the feed valve is opened, and 259g of ethylene oxide is slowly added to the reactor. After the addition is complete, the feed valve is closed. The reactor temperature is raised to 140°C, and the reaction pressure is controlled at 0.22MPa. After the reactor pressure drops, the materials in the reactor react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding intermediate product A3.

[0054] Lower the reactor temperature to 120℃, open the feed valve, and slowly add 520g of propylene oxide to the reactor. After the addition is complete, close the feed valve. Raise the reactor temperature to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, allow the materials in the reactor to react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding intermediate product B3.

[0055] Open the feed valve and slowly add 260g of ethylene oxide into the reactor. After the addition is complete, close the feed valve. Heat the reactor to 140℃ and control the reaction pressure at 0.22MPa. After the reactor pressure drops, allow the materials in the reactor to react for another 35 minutes until the pressure reading reaches -0.09MPa, yielding polyether C3.

[0056] Prepare a three-necked flask and add 9g of polyether C3. Heat the flask to 60°C in a water bath, then add 0.12g of potassium hydroxide. Increase the temperature to 70°C and slowly add 3.33g of a 30% aqueous solution of sodium chloroacetate dropwise over 4 hours. After the addition is complete, maintain the temperature at 80°C and allow the reaction to proceed for 8 hours. Then, allow the flask to return to room temperature and let it stand for another 1 hour to obtain product D3. Finally, add 7.67g of deionized water to product D3 to prepare a 50% aqueous solution, thus creating a Gemini surfactant-type oil stain cleaner, labeled as sample 3.

[0057] Example 4 Performance Evaluation of Gemini Surfactant-Based Oil Stain Cleaner

[0058] The cleaning power, foaming performance, corrosiveness, rust prevention, rinsing properties, and high and low temperature stability of the oil stain cleaner were evaluated. Samples 1, 2, and 3 correspond to the following experimental samples in the polymerization reaction: first step with 99, 159, and 259 parts ethylene oxide; second step with 200, 320, and 520 parts propylene oxide; and third step with 100, 160, and 260 parts ethylene oxide, respectively.

[0059] (1) Prepare metal test pieces, including No. 45 steel, Z30 grade 1 cast iron, H62 brass, LY12-BC2 hard aluminum, and 1Cr18Ni9Ti stainless steel; clean the test pieces and set them aside; prepare the test solutions required for the experiment, all of which are prepared as 3% solutions; the solvent for testing the cleaning power and defoaming performance is 250mg / kg hard water (containing 0.1658g / L anhydrous calcium chloride and 0.247g / L magnesium sulfate heptahydrate); the solvent for testing the corrosiveness, rinsing properties and rust prevention properties is deionized water.

[0060] (2) Cleaning power evaluation: First, weigh the metal sample and record it as m1. Then, coat it with oil and weigh it again, recording it as m2. Next, heat the prepared test solution to 60℃ in a water bath. Then, immerse the oil-coated sample in the test solution for 3 minutes. The artificial oil is prepared as follows: 8% barium petroleum sulfonate, 3.5% lanolin magnesium soap, 2% lanolin, 30% industrial petroleum jelly, 34.5% No. 20 machine oil, 12% No. 30 machine oil, 2% calcium-based grease, and 8% alumina. Then, rinse for 3 minutes, remove it, and continue rinsing in 60℃ distilled water for 30 seconds. Finally, place it in a 70℃ drying oven to dry for 2 hours, cool, weigh, and record it as m3. The cleaning power percentage (δ) is calculated as follows. m ) Calculate according to formula (1).

[0061] δ m = (m2-m3) / (m2-m1) Equation (1)

[0062] (3) Evaluation of defoaming properties: Heat the prepared test solution to 40℃ in a water bath and age for 30 minutes. Then clean the graduated tube with distilled water and clean it with the test solution. Add the test solution from the bottom of the graduated tube to make the graduation line above 50ml and close the stopcock. After standing for 5 minutes, adjust the stopcock to make the graduation line at 50ml. Add 200ml of test solution to the dropper and place it 90cm above the graduated tube. Start dropping the solution. After the solution has been dropped completely, record the foam height. Record the foam height 5 minutes later.

[0063] (4) Evaluation of high and low temperature stability: The test solution was placed in a stoppered wide-mouth glass bottle and placed in a 60℃ constant temperature chamber and a -5℃ refrigerator respectively. The former was placed for 6 hours and the latter for 24 hours. Finally, the appearance of the test solution was checked after it was restored to room temperature.

[0064] (5) Corrosivity evaluation: Heat the prepared test solution to 80°C in a water bath, weigh the test piece, soak it in the test solution for 2 hours, then rinse it 10 times in deionized water, then immerse it in anhydrous ethanol and blow it dry, and finally place it in a drying oven at 40°C for 1 hour. After cooling, weigh it.

[0065] (6) Rust prevention evaluation: Heat the prepared test solution to 80°C in a water bath, immerse the test piece in the test solution for 30 seconds, then use filter paper to absorb the excess liquid, dry in a drying oven at 35°C for 15 minutes, and then keep the oven at 35°C and 90% relative humidity for 24 hours. After the drying is completed, check the test piece.

[0066] (7) Evaluation of washability: Heat the prepared test solution to 60°C in a water bath, soak the test piece for 5 minutes, then use filter paper to absorb the excess liquid, dry in a drying oven at 40°C for 30 minutes, then rinse 10 times in distilled water, blow dry the test piece, and check the test piece.

[0067] The performance of three experimental samples and commercially available conventional oil stain cleaners was evaluated. The evaluation results are shown in Tables 1-4 below.

[0068] Table 1 Comparison of cleaning power of different cleaning agents

[0069]

[0070] Table 2 Comparison of defoaming properties and high and low temperature stability of different cleaning agents

[0071] Sample 1 3.2 No stratification, precipitation, etc. No stratification, and no precipitation, etc. Sample 2 1.7 No stratification, precipitation, etc. No stratification, and no precipitation, etc. Sample 3 2.6 No stratification, precipitation, etc. No stratification, precipitation, etc. conventional cleaning agents 2.3 No stratification, precipitation, etc. No stratification, precipitation, etc.

[0072] Table 3 Comparison of Corrosion Performance of Different Cleaning Agents

[0073]

[0074] Table 4 Comparison of Rust Inhibition and Rinsing Performance of Different Cleaning Agents

[0075]

[0076] The appearance grades for corrosion and rust prevention tests are determined as follows: For steel and cast iron, grade 0 represents no rust and no obvious changes; grade 1 represents no rust but slight discoloration or loss of gloss; grade 2 represents light rust or uneven discoloration; and grade 3 represents extensive rust on the surface. For copper and aluminum, grade 0 represents no obvious changes; grade 1 represents slight uniform discoloration or loss of gloss; grade 2 represents uneven discoloration and loss of gloss with localized spots; and grade 3 represents severe discoloration or corrosion.

[0077] The experimental results in Tables 1-4 show that Sample 2, with 159 parts ethylene oxide in the first step of the polymerization reaction, 320 parts propylene oxide in the second step, and 160 parts ethylene oxide in the third step, exhibits the best performance and cleaning effect.

Claims

1. A method for preparing a surfactant, comprising: (1) Add 1 part of 4,4'-dihydroxydiphenylmethane and 2-7 parts of potassium hydroxide to the reactor, replace the air in the reactor with a protective gas and evacuate to a vacuum, heat to 115-125℃, add 159 parts of ethylene oxide, raise the temperature to 130-140℃, control the reaction pressure to 0.22±0.02MPa, and obtain intermediate product A after the reaction is completed; (2) When the temperature inside the reactor drops to 115-125℃, add 320 parts of propylene oxide, raise the temperature to 130-140℃, control the reaction pressure to 0.22±0.02MPa, and obtain intermediate product B after the reaction is completed; (3) When the temperature inside the reactor drops to 115-125℃, add 160 parts of ethylene oxide, raise the temperature to 130-140℃, control the reaction pressure to 0.22±0.02MPa, and after the reaction is completed, cool down and open the reactor to obtain polyether C; (4) Heat 90 parts of polyether C to 50-60℃, add 1-2 parts of potassium hydroxide, then heat to 60-70℃, and add an aqueous solution of sodium chloroacetate dropwise, wherein the solute sodium chloroacetate is 8-12 parts, and the sodium chloroacetate aqueous solution is added dropwise for 3-5 hours. After the addition is complete, maintain the reaction temperature at 80-85℃ to allow the reaction to proceed fully. After the temperature drops to room temperature, let it stand to obtain product D, which is the surfactant.

2. The preparation method according to claim 1, wherein, The mass concentration of the aqueous solution of sodium chloroacetate is 30%.

3. The preparation method according to claim 1, wherein, The reaction time for step (3) is 8-9 hours.

4. The preparation method according to claim 1, wherein, The settling time for step (3) is 0.5-1h.

5. The preparation method according to claim 1, wherein, The process of evacuating to a vacuum involves evacuating the reactor to a pressure of -0.09 MPa or lower.

6. The preparation method according to claim 1, wherein, In step (1), after adding ethylene oxide and the pressure inside the reactor drops, the material inside the reactor reacts for another 30-40 minutes. When the pressure inside the reactor reaches -0.09 MPa or lower, intermediate product A is obtained.

7. The preparation method according to claim 1, wherein, In step (2), after adding propylene oxide and the pressure inside the reactor drops, the material inside the reactor reacts for another 30-40 minutes. When the pressure inside the reactor reaches -0.09 MPa or lower, intermediate product B is obtained.

8. The preparation method according to claim 1, wherein, In step (3), after adding ethylene oxide and the pressure inside the reactor drops, the material inside the reactor reacts for another 30-40 minutes. When the pressure inside the reactor reaches -0.09 MPa or lower, polyether C is obtained.

9. The preparation method according to claim 1, wherein, In step (1), the amount of potassium hydroxide added is 2.4-6.24 parts.

10. The preparation method according to claim 9, wherein, In step (1), the amount of potassium hydroxide added is 2.4 parts, 3.84 parts, or 6.24 parts.

11. The preparation method according to claim 1, wherein, In step (1), the protective gas is nitrogen.

12. The preparation method according to claim 1, wherein, In step (1), the heating temperature before adding ethylene oxide is 120°C, and the heating temperature after adding ethylene oxide is 140°C.

13. The preparation method according to claim 1, wherein, In step (2), the heating temperature before adding propylene oxide is 120°C, and the heating temperature after adding ethylene oxide is 140°C.

14. The preparation method according to claim 1, wherein, In step (3), the heating temperature before adding ethylene oxide is 120°C, and the heating temperature after adding ethylene oxide is 140°C.

15. The preparation method according to claim 1, wherein, In step (4), the amount of potassium hydroxide added is 1.17-1.35 parts.

16. The preparation method according to claim 15, wherein, In step (4), the amount of potassium hydroxide added is 1.17 parts.

17. The preparation method according to claim 1, wherein, In step (4), the solute sodium chloroacetate is 10-12 parts.

18. The preparation method according to claim 17, wherein, In step (4), the solute sodium chloroacetate is 10 parts.

19. A surfactant prepared by the method according to any one of claims 1-18.

20. A twin surfactant-type oil stain cleaner, which is a solution made using the surfactant of claim 19.

21. The gemini surfactant-type oil stain cleaner according to claim 20, wherein, The concentration of the solution is 40%-60%.

22. The gemini surfactant-type oil stain cleaner according to claim 21, wherein, The concentration of the solution is 50%.

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