A high-stability crude oil and its preparation method

Abstract

The present invention relates to a kind of high stability and crude oil and preparation method thereof, and crude oil comprises the following components by weight percentage: fatty acid methyl ester 35-45%, epoxidized soybean oil 35-40%, additive 15-20%, water 5-8%, wherein fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester, and additive is made up of NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether;Fatty acid methyl ester, epoxidized soybean oil additive and water are reacted in proportion, and pH is adjusted to 6-7 to obtain crude oil. Castor oil polyoxypropylene polyoxyethylene ether is added to crude oil of the present invention, and permeability, emulsification and washing ability are greatly improved;C16 fatty acid methyl ester and C18 fatty acid methyl ester compound are added, so that crude oil aqueous solution has excellent stability at room temperature, low temperature and high temperature, and stratification phenomenon will not occur.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing auxiliaries, and particularly relates to a high-stability crude oil and a preparation method thereof. Background Art

[0002] Wool fiber processing generally requires pretreatment with oils, of which wool oil is a key component. It imparts smoothness, softness, cohesion, and antistatic properties to wool fibers, preventing combing difficulties, extensive fiber damage, excessive flyaways, shedding, and high breakage rates. Woolen oils consist of a base oil and additives. The base oil, the primary component, acts as a lubricant, hence the name "smoothing agent." Additives, typically surfactants, contribute to cohesion, antistatic properties, wetting and penetration, moisture absorption, sterilization, defoaming, and rust prevention.

[0003] Generally, an atomizing device is used to evenly spray the wool fiber with a water solution of wool oil. After a proper period of time and curing, a lubricating oil film gradually forms on the surface of the wool fiber. This oil film acts as a lubricant during the combing of the wool fiber, thereby reducing damage to the wool fiber. At the same time, it has a certain degree of bundling, improving the cohesion between the wool fibers and preventing breakage. It also reduces static electricity generated by friction between the wool fibers, between metals, and between rubber sheets during the combing process, reducing flying hair and entanglement with card clothing. The wetting effect of the wool oil can make the fiber soft and maintain its elasticity, allowing smooth spinning, thereby improving the yield rate and production efficiency.

[0004] Since the application of wool oil is only an auxiliary means in the spinning process, the presence of these oils is harmful to the subsequent dyeing and finishing, affecting the fiber's water absorption and having a certain dye repellency effect. Therefore, the wool oil must be easy to emulsify and wash out, and the viscosity of the oil should not be too high, otherwise it will stain the guide rollers during the spinning process and affect the yarn quality. In addition, the stability of the wool oil solution itself must be guaranteed, including during use and storage. If stratification occurs, the functional effect of the wool oil on the wool fiber will be greatly reduced or even eliminated. Summary of the Invention

[0005] The object of the present invention is to provide a high-stability crude oil which not only has excellent permeability, emulsification and washing abilities but also has good temperature stability and time stability.

[0006] The technical solution adopted by the present invention to solve the above problems is: a high-stability crude oil, which comprises the following components in weight percentage:

[0007] Fatty acid methyl ester 35-45%

[0008] Epoxidized soybean oil 35-40%

[0009] Additives 15-20%

[0010] Water 5-8%

[0011] Wherein, the fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester.

[0012] The additives are composed of NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether.

[0013] Preferably, the mass ratio of C16 fatty acid methyl ester to C18 fatty acid methyl ester is 1-2:1.

[0014] Preferably, C16 fatty acid methyl ester is obtained by reacting a linear C16 fatty acid with methanol, and C18 fatty acid methyl ester is obtained by reacting a linear C18 fatty acid with methanol.

[0015] Preferably, the castor oil polyoxypropylene polyoxyethylene ether is prepared by the following preparation method:

[0016] (1) Castor oil and catalyst were added to the reactor, stirred, heated to 110-130°C, dehydrated under reduced pressure, and propylene oxide was added under nitrogen protection to carry out ring-opening reaction. The pressure in the reactor was controlled to be less than 0.3 MPa. After the addition was completed, the reaction was continued for a period of time until the pressure reached 0 MPa.

[0017] (2) maintaining the temperature of the reactor at 110-130°C, adding ethylene oxide, controlling the pressure in the reactor to be less than 0.3 MPa, continuing the reaction for a period of time after the addition until the pressure reaches 0 MPa, and cooling to obtain crude castor oil polyoxypropylene polyoxyethylene ether;

[0018] (3) The crude castor oil polyoxypropylene polyoxyethylene ether prepared in step (2) is poured into a neutralization kettle, and an acid is added for neutralization and an adsorbent is added for adsorption. The product is then dehydrated under reduced pressure and filtered to obtain the finished castor oil polyoxypropylene polyoxyethylene ether.

[0019] More preferably, the molar ratio of castor oil, propylene oxide and ethylene oxide is 1:2~4:2~4.

[0020] More preferably, the molar ratio of castor oil, propylene oxide and ethylene oxide is 1:3:3.

[0021] More preferably, the catalyst is an alkaline earth catalyst and the adsorbent is magnesium silicate.

[0022] Preferably, the additive consists of 12% NSF 10E, 30% NSF 6, 8% coconut oil diethanolamide, 20% fatty alcohol polyoxyethylene ether phosphate and 30% castor oil polyoxypropylene polyoxyethylene ether, in terms of weight percentage.

[0023] Another object of the present invention is to provide a method for preparing a high-stability crude oil, comprising the following steps:

[0024] Step 1: react fatty acid methyl ester and epoxidized soybean oil in proportion to obtain synthetic oil;

[0025] Step 2: Add fatty alcohol polyoxyethylene ether into a reactor, add phosphorus pentoxide in batches under high-speed stirring, slowly increase the temperature after the addition to carry out insulation reaction, then add water and continue insulation reaction to obtain fatty alcohol polyoxyethylene ether phosphate;

[0026] Step 3: reacting NSF 10E, NSF 6, coconut oil diethanolamide, the fatty alcohol polyoxyethylene ether phosphate obtained in step 2, and castor oil polyoxypropylene polyoxyethylene ether in proportion to obtain an additive;

[0027] Step 4: reacting the synthetic oil obtained in step 1, the additive obtained in step 3 and water in proportion, and adjusting the pH to 6-7 after the reaction to obtain crude oil.

[0028] Preferably, a method for preparing a high-stability crude oil comprises the following steps:

[0029] Step 1: Mix fatty acid methyl ester and epoxidized soybean oil in proportion and react at 80-85°C under vacuum of 0.08-0.1 MPa for 30-45 minutes, then cool and discharge to obtain synthetic oil;

[0030] Step 2: Add fatty alcohol polyoxyethylene ether 5EO into a reactor equipped with a thermometer and a temperature control device, slowly add phosphorus pentoxide in batches under high-speed stirring, and the addition time is 2-3 hours. After the addition is completed, slowly heat to 65-70°C and keep warm for 4-5 hours, then add 5% of the total weight of water and continue to keep warm for 2-4 hours, cool and discharge to obtain fatty alcohol polyoxyethylene ether phosphate, wherein the molar ratio of fatty alcohol polyoxyethylene ether to phosphorus pentoxide is 2.2:1;

[0031] Step 3: NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether are mixed in proportion and reacted at 70-80° C. and normal pressure for 20-30 minutes to obtain an additive;

[0032] Step 4: react the synthetic oil obtained in step 1, the additive obtained in step 3 and water in proportion at 80-90° C. for 60-70 minutes, and then adjust the pH to 6-7 to obtain crude oil.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] (1) Castor oil polyoxypropylene polyoxyethylene ether is added to the additive of the present invention, and the molecular chain contains propylene oxide segments and ethylene oxide segments, which greatly improves the permeability and has excellent emulsification and washing abilities. The wool oil can be removed with clean water and has no adverse effects on the subsequent processing of wool fibers.

[0035] (2) The present invention adopts fatty acid methyl ester and epoxidized soybean oil as oils and fats for use in crude oil. The fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester, which has a synergistic effect on lubricity and makes the crude oil aqueous solution have excellent stability. It has excellent stability at room temperature, low temperature and high temperature, and will not have stratification phenomenon, thus avoiding incompatibility of the components in the crude oil and greatly reducing the curing efficiency; at the same time, the viscosity of the crude oil is maintained at 100~110mPa·s (25℃), so that the crude oil has both cohesion and fluidity, that is, on the basis of ensuring the cohesion, the fluidity of the crude oil is maintained to avoid contamination of the guide roller during the spinning process and affecting the yarn quality. DETAILED DESCRIPTION

[0036] The present invention is described in further detail below with reference to the examples. Example 1

[0037] A high stability crude oil comprising the following components by weight percentage:

[0038] Fatty acid methyl ester 35%

[0039] Epoxidized soybean oil 40%

[0040] Additives 20%

[0041] Water 5%

[0042] Among them, the fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester in a mass ratio of 1:1; in terms of weight percentage, the additive consists of 12% NSF 10E, 30% NSF 6, 8% coconut oil diethanolamide, 20% fatty alcohol polyoxyethylene ether phosphate and 30% castor oil polyoxypropylene polyoxyethylene ether.

[0043] A method for preparing high-stability crude oil, comprising the following steps:

[0044] Step 1: Mix fatty acid methyl ester and epoxidized soybean oil in the above proportions, react at 80° C. and vacuum 0.08 MPa for 45 minutes, and then cool and discharge to obtain synthetic oil.

[0045] Step 2: Add isomeric decanol polyoxyethylene ether 5EO into a reactor equipped with a thermometer and a temperature control device, and slowly add phosphorus pentoxide in batches under high-speed stirring. The addition time is 2.5 hours. After the addition is completed, the temperature is slowly raised to 68°C and the reaction is maintained for 4 hours. Then, 5% of the total weight of water is added and the reaction is continued for 2.5 hours. The temperature is cooled and the material is discharged to obtain fatty alcohol polyoxyethylene ether phosphate, wherein the molar ratio of isomeric decanol polyoxyethylene ether to phosphorus pentoxide is 2.2:1.

[0046] Step 3: Add 1 mol of castor oil and catalyst potassium hydroxide (0.5% of the mass of castor oil) to the reactor, stir, heat to 120°C, decompress and dehydrate, add 3 mol of propylene oxide under nitrogen protection for ring-opening reaction, control the pressure in the reactor to be less than 0.3 MPa, continue to react after 2 hours of addition, until the pressure reaches 0 MPa; maintain the temperature of the reactor at 120°C, add 3 mol of ethylene oxide dropwise, control the pressure in the reactor to be less than 0.3 MPa, continue to react after 2 hours of addition, until the pressure reaches 0 MPa, cool to obtain crude castor oil polyoxypropylene polyoxyethylene ether; then pour into a neutralization kettle, add hydrochloric acid for neutralization to pH 6~7, adsorb with adsorbent magnesium silicate, dehydrate under reduced pressure, and filter to obtain castor oil polyoxypropylene polyoxyethylene ether.

[0047] Step 4: NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether were mixed in the above proportions and reacted at 80° C. and normal pressure for 30 minutes to obtain an additive.

[0048] Step 5: react the synthetic oil obtained in step 1, the additive obtained in step 4 and water in proportion at 90° C. for 60 minutes, and then adjust the pH to 6-7 to obtain crude oil. Example 2

[0049] A high stability crude oil comprising the following components by weight percentage:

[0050] Fatty acid methyl ester 40%

[0051] Epoxidized soybean oil 35%

[0052] Additives 19%

[0053] Water 6%

[0054] Among them, the fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester in a mass ratio of 2:1; in terms of weight percentage, the additive consists of 12% NSF 10E, 30% NSF 6, 8% coconut oil diethanolamide, 20% fatty alcohol polyoxyethylene ether phosphate and 30% castor oil polyoxypropylene polyoxyethylene ether.

[0055] A method for preparing high-stability crude oil, comprising the following steps:

[0056] Step 1: Mix fatty acid methyl ester and epoxidized soybean oil in the above proportions, react at 80° C. and vacuum 0.08 MPa for 45 minutes, and then cool and discharge to obtain synthetic oil.

[0057] Step 2: Add isomeric decanol polyoxyethylene ether 5EO into a reactor equipped with a thermometer and a temperature control device, and slowly add phosphorus pentoxide in batches under high-speed stirring. The addition time is 2.5 hours. After the addition is completed, the temperature is slowly raised to 65°C and the reaction is maintained for 5 hours. Then, 5% of the total weight of water is added and the reaction is continued for 2.5 hours. The temperature is cooled and the material is discharged to obtain fatty alcohol polyoxyethylene ether phosphate, wherein the molar ratio of isomeric decanol polyoxyethylene ether to phosphorus pentoxide is 2.2:1.

[0058] Step 3: Add 1 mol of castor oil and catalyst potassium hydroxide (0.5% of the mass of castor oil) to the reactor, stir, heat to 120°C, decompress and dehydrate, add 3 mol of propylene oxide under nitrogen protection for ring-opening reaction, control the pressure in the reactor to be less than 0.3 MPa, continue to react after 2 hours of addition, until the pressure reaches 0 MPa; maintain the temperature of the reactor at 120°C, add 3 mol of ethylene oxide dropwise, control the pressure in the reactor to be less than 0.3 MPa, continue to react after 2 hours of addition, until the pressure reaches 0 MPa, cool to obtain crude castor oil polyoxypropylene polyoxyethylene ether; then pour into a neutralization kettle, add hydrochloric acid for neutralization to pH 6~7, adsorb with adsorbent magnesium silicate, dehydrate under reduced pressure, and filter to obtain castor oil polyoxypropylene polyoxyethylene ether.

[0059] Step 4: NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether were mixed in the above proportions and reacted at 80° C. and normal pressure for 30 minutes to obtain an additive.

[0060] Step 5: react the synthetic oil obtained in step 1, the additive obtained in step 4 and water in proportion at 80° C. for 70 minutes, and then adjust the pH to 6-7 to obtain crude oil. Example 3

[0061] A high stability crude oil comprising the following components by weight percentage:

[0062] Fatty acid methyl ester 45%

[0063] Epoxidized soybean oil 35%

[0064] Additives 15%

[0065] Water 5%

[0066] Among them, the fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester in a mass ratio of 1:1; in terms of weight percentage, the additive consists of 12% NSF 10E, 30% NSF 6, 8% coconut oil diethanolamide, 20% fatty alcohol polyoxyethylene ether phosphate and 30% castor oil polyoxypropylene polyoxyethylene ether.

[0067] A method for preparing high-stability crude oil, comprising the following steps:

[0068] Step 1: Mix fatty acid methyl ester and epoxidized soybean oil in the above proportions, react at 85° C. and vacuum 0.08 MPa for 40 minutes, cool and discharge to obtain synthetic oil.

[0069] Step 2: Add isomeric decanol polyoxyethylene ether 5EO into a reactor equipped with a thermometer and a temperature control device, and slowly add phosphorus pentoxide in batches under high-speed stirring. The addition time is 2.5 hours. After the addition is completed, the temperature is slowly raised to 70°C and the reaction is maintained for 4 hours. Then, 5% of the total weight of water is added and the reaction is continued for 3 hours. The temperature is cooled and the material is discharged to obtain fatty alcohol polyoxyethylene ether phosphate, wherein the molar ratio of isomeric decanol polyoxyethylene ether to phosphorus pentoxide is 2.2:1.

[0070] Step 3: Add 1 mol of castor oil and catalyst potassium hydroxide (0.5% of the mass of castor oil) to the reactor, stir, heat to 115°C, dehydrate under reduced pressure, add 3 mol of propylene oxide under nitrogen protection for ring-opening reaction, control the pressure in the reactor to be less than 0.3 MPa, continue to react after 2 hours of addition, until the pressure reaches 0 MPa; maintain the temperature of the reactor at 120°C, add 3 mol of ethylene oxide dropwise, control the pressure in the reactor to be less than 0.3 MPa, continue to react after 2 hours of addition, until the pressure reaches 0 MPa, cool to obtain crude castor oil polyoxypropylene polyoxyethylene ether; then pour into a neutralization kettle, add hydrochloric acid for neutralization to pH 6~7, adsorb with adsorbent magnesium silicate, dehydrate under reduced pressure, and filter to obtain castor oil polyoxypropylene polyoxyethylene ether.

[0071] Step 4: NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether were mixed in the above proportions and reacted at 80° C. and normal pressure for 30 minutes to obtain an additive.

[0072] Step 5: react the synthetic oil obtained in step 1, the additive obtained in step 4 and water in proportion at 90° C. for 60 minutes, and then adjust the pH to 6-7 to obtain crude oil.

[0073] Comparative Example 1

[0074] The only difference from Example 1 is that the fatty acid methyl ester is only C16 fatty acid methyl ester.

[0075] Comparative Example 2

[0076] The only difference from Example 1 is that the fatty acid methyl ester is only C18 fatty acid methyl ester.

[0077] Comparative Example 3

[0078] The only difference from Example 1 is that it does not contain castor oil polyoxypropylene polyoxyethylene ether.

[0079] Comparative Example 4

[0080] The only difference from Example 1 is that castor oil polyoxypropylene polyoxyethylene ether is replaced by castor oil polyoxyethylene ether.

[0081] Comparative Example 5

[0082] The only difference from Example 1 is that the molar ratio of castor oil, propylene oxide and ethylene oxide is 2:1:1.

[0083] The crude oils prepared in Examples 1-3 and Comparative Examples 1-5 were tested for their properties. The test methods are as follows, and the test results are shown in Table 1:

[0084] Permeability: Canvas Sedimentation Method: Place a standard round canvas piece with a diameter of 35 mm in 200 mL of a 2% crude oil aqueous solution (mass fraction) at 25°C. Count the time it takes for the canvas piece to sink from the surface of the solution to the bottom of the beaker with a stopwatch. Repeat this step five times and take the average value. The smaller the value, the faster the wetting and sedimentation, and the better the permeability.

[0085] Temperature stability: Place 200 mL of 5% crude oil and water solutions (mass fraction) at 0°C, 5°C, 10°C, 20°C, 30°C, and 40°C for 1 hour. If the solution does not freeze at low temperatures and remains clear and transparent and evenly dispersed at high temperatures, it means that the solution has good temperature stability.

[0086] Time stability: Place 200 mL of 5% crude oil aqueous solution (mass fraction) at 25°C for 72 hours and observe whether stratification occurs.

[0087] Emulsification test: Place crude oil and water in a mass ratio of 1:10 in a sample bottle and shake it manually ten times to observe whether the water phase and the oil phase can quickly form a uniform emulsion.

[0088] The 10% aqueous solution of crude oil prepared in Examples 1-3 and Comparative Examples 1-5 was placed in a spraying device and sprayed evenly on wool fibers (fineness of 14-25 μm). 10 g of the aqueous solution of crude oil was sprayed on 1 g of wool fibers. The treated wool fibers were placed at a temperature of 25° C. and a relative humidity of 60% for 24 hours, naturally air-dried, and then subjected to performance tests. The test results are shown in Table 2:

[0089] Among them, degreasing property: the wool fiber after conditioning is washed twice with 35℃ water and once with 15℃ water, dried, and then the oil content of the washed wool fiber is determined using a grease extractor (Soxhlet extractor).

[0090] Lubricity: Measure the coefficient of friction by placing the cured wool fibers firmly against a friction table and using a SUS304BA metal plate as the friction partner. Add a 250g weight to the table and test at a speed of 50mm / min. The coefficient of friction is calculated as follows:

[0091] μ=f / N

[0092] Where μ: sliding friction coefficient, f: dynamic friction (N), N: normal pressure on the sample (N)

[0093] Table 1 Test results of crude oil properties of Examples 1-3 and Comparative Examples 1-5

[0094]

[0095] Table 2 Performance test results of wool fibers treated with wool oil in Examples 1-3 and Comparative Examples 1-5

[0096]

[0097] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A high stability crude oil, characterized by: In terms of weight percentage, it is prepared from the following raw materials: Fatty acid methyl ester 35-45% Epoxidized soybean oil 35-40% Additives 15-20% Water 5-8% Wherein, the fatty acid methyl ester is a compound of C16 fatty acid methyl ester and C18 fatty acid methyl ester; The additives consist of NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate, and castor oil polyoxypropylene polyoxyethylene ether; C16 fatty acid methyl ester is obtained by reacting a linear C16 fatty acid with methanol, and C18 fatty acid methyl ester is obtained by reacting a linear C18 fatty acid with methanol. The castor oil polyoxypropylene polyoxyethylene ether is prepared by the following preparation method: (1) Add castor oil and catalyst to the reactor, stir, heat to 110-130°C, decompress and dehydrate, add propylene oxide under nitrogen protection to react, control the pressure in the reactor to be less than 0.3 MPa, and continue the reaction after the addition is complete until the pressure reaches 0 MPa; (2) maintaining the temperature of the reactor at 110-130°C, adding ethylene oxide, controlling the pressure in the reactor to be less than 0.3 MPa, continuing the reaction after the addition until the pressure reaches 0 MPa, and cooling to obtain crude castor oil polyoxypropylene polyoxyethylene ether; (3) pouring the crude castor oil polyoxypropylene polyoxyethylene ether prepared in step (2) into a neutralization kettle, adding acid for neutralization, adsorbent for adsorption, decompressing and dehydrating, and filtering to obtain the finished castor oil polyoxypropylene polyoxyethylene ether; The molar ratio of castor oil, propylene oxide and ethylene oxide is 1:3:3; The high stability and crude oil are prepared by the following preparation method: Step 1: react fatty acid methyl ester and epoxidized soybean oil in proportion to obtain synthetic oil; Step 2: Add fatty alcohol polyoxyethylene ether into a reactor, add phosphorus pentoxide in batches under high-speed stirring, slowly increase the temperature after the addition to carry out insulation reaction, then add water and continue insulation reaction to obtain fatty alcohol polyoxyethylene ether phosphate; Step 3: reacting NSF 10E, NSF 6, coconut oil diethanolamide, the fatty alcohol polyoxyethylene ether phosphate obtained in step 2, and castor oil polyoxypropylene polyoxyethylene ether in proportion to obtain an additive; Step 4: reacting the synthetic oil obtained in step 1, the additive obtained in step 3 and water in proportion, and adjusting the pH to 6-7 after the reaction to obtain crude oil.

2. The high stability crude oil according to claim 1, characterized in that: The mass ratio of C16 fatty acid methyl ester to C18 fatty acid methyl ester is 1~2:

1.

3. The high stability crude oil according to claim 1, characterized in that: The catalyst is an alkaline earth catalyst, and the adsorbent is magnesium silicate.

4. The high stability crude oil according to claim 1, characterized in that: Calculated by weight percentage, the additive consists of 12% of NSF 10E, 30% of NSF 6, 8% of coconut oil diethanolamide, 20% of fatty alcohol polyoxyethylene ether phosphate and 30% of castor oil polyoxypropylene polyoxyethylene ether.

5. A method for preparing a high-stability crude oil according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: react fatty acid methyl ester and epoxidized soybean oil in proportion to obtain synthetic oil; Step 2: Add fatty alcohol polyoxyethylene ether into a reactor, add phosphorus pentoxide in batches under high-speed stirring, slowly increase the temperature after the addition to carry out insulation reaction, then add water and continue insulation reaction to obtain fatty alcohol polyoxyethylene ether phosphate; Step 3: reacting NSF 10E, NSF 6, coconut oil diethanolamide, the fatty alcohol polyoxyethylene ether phosphate obtained in step 2, and castor oil polyoxypropylene polyoxyethylene ether in proportion to obtain an additive; Step 4: reacting the synthetic oil obtained in step 1, the additive obtained in step 3 and water in proportion, and adjusting the pH to 6-7 after the reaction to obtain crude oil.

6. The method for preparing a high stability crude oil according to claim 5, wherein: The specific steps include: Step 1: Mix fatty acid methyl ester and epoxidized soybean oil in proportion and react at 80-85°C under vacuum of 0.08-0.1 MPa for 30-45 minutes, then cool and discharge to obtain synthetic oil; Step 2: Add fatty alcohol polyoxyethylene ether 5EO into a reactor equipped with a thermometer and a temperature control device, slowly add phosphorus pentoxide in batches under high-speed stirring, and the addition time is 2-3 hours. After the addition is completed, slowly heat to 65-70°C and keep warm for 4-5 hours, then add 5% of the total weight of water and continue to keep warm for 2-4 hours, cool and discharge to obtain fatty alcohol polyoxyethylene ether phosphate, wherein the molar ratio of fatty alcohol polyoxyethylene ether to phosphorus pentoxide is 2.2:1; Step 3: NSF 10E, NSF 6, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether phosphate and castor oil polyoxypropylene polyoxyethylene ether are mixed in proportion and reacted at 70-80° C. and normal pressure for 20-30 minutes to obtain an additive; Step 4: react the synthetic oil obtained in step 1, the additive obtained in step 3 and water in proportion at 80-90° C. for 60-70 minutes, and then adjust the pH to 6-7 to obtain crude oil.

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