CN111841436A

CN111841436A - Vegetable oil surfactant and preparation method thereof

Info

Publication number: CN111841436A
Application number: CN202010466188.4A
Authority: CN
Inventors: 李学勇; 李友勇; 梁金胜; 李茂生
Original assignee: Guangzhou Hongmao Industrial Co ltd
Current assignee: Guangzhou Hongmao Industrial Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-10-30

Abstract

The invention relates to a vegetable oil surfactant and a preparation method thereof. The preparation method comprises the following steps: (1) mixing a reaction promoter with vegetable oil, and heating the mixture to 60-85 ℃; then adding an alkali aqueous solution under the condition of stirring, and reacting; (2) adding water into the reaction product obtained in the step (1) for dilution; wherein the reaction accelerator is at least one selected from C8-C18 oil and fat, and the type of the reaction accelerator is different from that of the vegetable oil and fat. The preparation method not only retains natural skin care components in vegetable oil, greatly shortens the production period to within 1 day, has short saponification reaction time, is convenient for industrial production, and has simple operation and high production efficiency, and the prepared product is transparent liquid.

Description

Vegetable oil surfactant and preparation method thereof

Technical Field

The invention relates to the technical field of surfactants, in particular to a vegetable oil surfactant and a preparation method thereof.

Background

At present, a large amount of surfactants are used in daily personal cleaning products such as shampoo, shower gel and facial cleanser to play a role in cleaning and foaming. Along with the improvement of living standard and consumption ability of people, people pay more and more attention to the quality of products in the process of personal cleaning, and the products which are mild and non-irritant to human bodies are more and more favored by people. Consumers are more concerned about the environmental impact of surfactants and the safety of human skin when using personal cleansing products. Traditional surfactants such as alkyl sulfate type surfactants, alkyl sulfonate type surfactants and the like have large irritation to human skin, are easy to cause sebum falling after long-time contact, and are difficult to wash away residual on the skin. The surfactant has low degradation rate and is not friendly to the ecological environment.

In addition, the surfactant is prepared by saponifying the vegetable oil, and the method is environment-friendly and high in safety. At present, the method is mostly prepared by hydrolyzing, refining and saponifying plant oil, so that natural skin care ingredients in the plant oil are lost, the pH of the prepared product is more than 11-12, the degreasing force is strong, the irritation is high, the skin of a human body is still easily subjected to long-time contact to cause the phenomena of skin sebum shedding, erythema and the like, if the product is used alone, the product is only suitable for washing articles such as clothes, tableware and the like, and if the product is applied to daily cosmetics such as shower gel and facial cleanser, a large amount of milder surfactant needs to be compounded with a small amount to reduce the irritation.

Meanwhile, in order to produce and obtain a surfactant capable of retaining natural skin care ingredients in vegetable oil and fat and having low irritation, technicians develop a cold-made liquid soap process, wherein the cold-made liquid soap can retain the natural skin care ingredients of the vegetable oil and fat, but the saponification time is long (usually 1-2 days), the purification time is 2-3 weeks, the production period is about 1 month, the prepared liquid soap is opaque at normal temperature and sometimes, the layering phenomenon occurs after long-term use, the batch performance is unstable, and the industrial production is difficult to realize.

Disclosure of Invention

Based on the above, the invention provides a preparation method of a vegetable oil surfactant. The preparation method not only retains natural skin care components in vegetable oil, greatly shortens the production period to within 1 day, has short saponification reaction time, is convenient for industrial production, and has simple operation and high production efficiency, and the prepared product is transparent liquid.

The specific technical scheme is as follows:

a preparation method of a vegetable oil surfactant comprises the following steps:

(1) mixing a reaction promoter with vegetable oil, and heating the mixture to 60-85 ℃; then adding an alkali aqueous solution under the condition of stirring, and reacting;

(2) adding water into the reaction product obtained in the step (1) for dilution;

wherein the reaction accelerator is at least one selected from C8-C18 fatty acid, C8-C18 fatty acyl amino acid, C8-C18 fatty alcohol polyether carboxylic acid and C8-18 fatty glyceride.

In one embodiment, the C8-C18 fatty acid is selected from one or more of lauric acid, coconut oil acid, palmitic acid, stearic acid, oleic acid.

In one embodiment, the C8-C18 fatty acyl amino acids are selected from at least one of lauroyl glutamic acid, lauroyl glycine, cocoyl glutamic acid, myristoyl glutamic acid.

In one embodiment, the C8-C18 fatty alcohol polyether carboxylic acid is selected from at least one of laureth-6 carboxylic acid, laureth-11 carboxylic acid, laureth-10 carboxylic acid and laureth-10 carboxylic acid.

In one embodiment, the C8-18 fatty acid glyceride is at least one selected from the group consisting of glycerol monolaurate, glycerol dilaurate, glycerol monostearate, and glycerol monopalmitate.

In one embodiment, the saponification value of the vegetable oil is greater than 180 mgKOH/g.

In one embodiment, the base is selected from at least one of potassium hydroxide, sodium hydroxide, and ethanolamine.

In one embodiment, in the step (1), the mass concentration of the alkali in the aqueous solution of the alkali is 15-48%.

In one embodiment, the amount of the reaction promoter is 0.1-35 wt%, the amount of the vegetable oil is 2-40 wt%, the amount of the alkali is 5-15 wt%, and the total amount of the water is 30-60 wt%.

In one embodiment, when the average saponification value of the vegetable oil is greater than or equal to 210mgKOH/g, the sum of the weight percentages of the vegetable oil and the reaction promoter is less than 42%, and the mass concentration of the alkali in the aqueous solution of the alkali is 15-25%;

When the average saponification value of the vegetable oil is less than 210mgKOH/g, the sum of the weight percentages of the vegetable oil and the reaction promoter is less than 36%, and the mass concentration of the alkali in the aqueous solution of the alkali is 20-45%.

In one embodiment, in step (2), the step of adding water for dilution comprises:

adding 5-8% of the weight of the residual water, preliminarily diluting the reaction product, stirring for 30-60 minutes, and adding the residual water.

In one embodiment, in the step (1), the reaction temperature is 80-95 ℃ and the reaction time is 3-4 hours.

The invention also provides the vegetable oil surfactant prepared by the preparation method.

Compared with the prior art, the invention has the following beneficial effects:

the preparation method of the vegetable oil surfactant provided by the invention adopts at least one of C8-C18 fatty acid, C8-C18 fatty acyl amino acid, C8-C18 fatty alcohol polyether carboxylic acid and C8-18 fatty glyceride as a reaction promoter in the vegetable oil saponification process, and after the reaction promoter and the vegetable oil are mixed and heated, the reaction activity of the reaction promoter is superior to that of the vegetable oil under the same conditions in the early stage of the saponification reaction, the generated product increases the dispersibility of the vegetable oil in water, and the contact surface with alkali is improved, so that the saponification process of the vegetable oil can be accelerated, and the saponification time is greatly shortened. The prepared vegetable oil surfactant is transparent liquid, so that abundant natural skin care ingredients are reserved, the effects of effectively cleaning skin and nourishing skin are achieved, the liquid form is convenient for a formulator to prepare and produce a cleaning product, the used domestic sewage can be decomposed under natural conditions, the environment is friendly, no harm is caused, and the development trend of the surfactant is met.

In addition, the preparation process does not need to adopt the saponification condition of high-temperature concentrated alkali, the production period is short, the production process is simple to operate, the production conditions are easy to meet, the production efficiency is high, and the method is suitable for large-scale industrial production.

Detailed Description

The vegetable oil and fat surfactant and the production method thereof according to the present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The embodiment of the invention provides a preparation method of a vegetable oil surfactant, which comprises the following steps:

Vegetable fats and oils are generally natural high molecular compounds obtained by combining fats and glycerin. Vegetable oil and fat are widely distributed in nature, and fats extracted from seeds, pulp and other parts of plants are collectively called vegetable oil and fat. Vegetable fats and oils are widely used, and those which are liquid at ordinary temperature are generally called oils, while those which are solid or semisolid are generally called fats and oils. The vegetable oil contains unsaturated fatty acid, has low melting point, is liquid at normal temperature, has high digestibility, also contains rich vitamin E, a small amount of potassium, sodium, calcium and trace elements, and theoretically can play a role in nourishing the skin, so the vegetable oil is greatly welcomed in the field of surfactants.

In the research process, novelty is found, at least one of C8-C18 fatty acid, C8-C18 fatty acyl amino acid, C8-C18 fatty alcohol polyether carboxylic acid and C8-18 fatty glyceride can be used as a reaction promoter in the vegetable oil saponification process, the reaction promoter and the vegetable oil are mixed and heated firstly, the reaction activity of the reaction promoter is superior to that of the vegetable oil under the same condition in the early stage of the saponification reaction, the generated product increases the dispersibility of the vegetable oil in water, the contact surface of the vegetable oil and alkali is improved, the saponification process of the vegetable oil can be accelerated, and the saponification time is greatly shortened. Meanwhile, the prepared vegetable oil surfactant is transparent liquid, so that abundant natural skin care ingredients such as glycerin and other nourishing skin care ingredients are reserved, the effects of effectively cleaning and nourishing skin are achieved, the liquid form is convenient for a formulator to prepare and produce a cleaning product, the used domestic sewage can be decomposed under natural conditions, the environment is friendly, no harm is caused, and the development trend of the surfactant is met. In addition, the preparation process does not need to adopt the saponification condition of high-temperature concentrated alkali, the production period is short, the production process is simple to operate, the production conditions are easy to meet, the production efficiency is high, and the method is suitable for large-scale industrial production.

In one specific embodiment, the C8-C18 fatty acid is selected from one or more of lauric acid, coconut oil acid, palmitic acid, stearic acid, and oleic acid.

In one specific embodiment, the C8-C18 fatty acyl amino acid is selected from at least one of lauroyl glutamic acid, lauroyl glycine, cocoyl glutamic acid, and myristoyl glutamic acid.

In a specific embodiment, the C8-C18 fatty alcohol polyether carboxylic acid is at least one selected from laureth-6-carboxylic acid, laureth-11-carboxylic acid and laureth-10-carboxylic acid.

In one specific embodiment, the C8-18 fatty acid glyceride is at least one selected from the group consisting of glycerol monolaurate, glycerol dilaurate, glycerol monostearate, and glycerol monopalmitate.

The grease has better effect of improving saponification rate by being used as a reaction promoter.

It will be appreciated that the particular type of vegetable oil or fat may be selected according to the type of surfactant desired to be prepared. In one particular embodiment, the vegetable oil may include, but is not limited to, one or more of the following: coconut oil, palm kernel oil, palm oil, olive oil, camellia seed oil, sunflower seed oil, castor oil, evening primrose oil, rose hip oil, grape seed oil, jojoba oil, rice bran oil, almond oil, and soybean oil. Preferably, the vegetable oil or fat has a saponification value of greater than 180mgKOH/g, such as coconut oil, palm kernel oil, palm oil, olive oil, camellia oil, sunflower oil, castor oil, evening primrose oil, rose hip oil, grape seed oil, and the like.

In one specific embodiment, the amount of the reaction promoter is 0.1-35 wt%, the amount of the vegetable oil is 2-40 wt%, the amount of the alkali is 5-15 wt%, and the total amount of the water is 30-60 wt%. The amount of the reaction promoter is reasonably matched with the type of the vegetable oil, so that the saponification time can be further shortened, the feeding amount of the vegetable oil is increased, and the effective content of the vegetable oil soap is increased.

More specifically, when the reaction promoter is at least one selected from C8-C18 fatty acid, C8-C18 fatty acyl amino acid and C8-C18 fatty alcohol polyether carboxylic acid, the dosage of the reaction promoter is 2-35% by weight.

When the reaction promoter is selected from C8-18 fatty glyceride, the dosage of the reaction promoter is 0.1-2% by weight.

In addition, in the further research process, the inventor also finds that the concentration of different alkali liquors (namely the mass concentration of the alkali in the aqueous solution of the alkali) has a large influence on the viscosity of a system during reaction, the viscosity of the system is not beneficial to the reaction of the system, and meanwhile, the viscosity has different degrees of influence on the reaction rate, so that the proper concentration of the alkali liquor is also a key factor for preparing the vegetable oil surfactant.

In one specific embodiment, in the step (1), the mass concentration of the alkali in the aqueous solution of the alkali is 15-48%. Therefore, the proper consistency of the reaction system can be ensured, the saponification efficiency is high, and the prepared surfactant has high transparency and good liquid fluidity. If the content is too high, the surfactant prepared in the reaction is easy to be pasty, the saponification time is prolonged, if the content is too low, the reaction completion rate is low, the saponification rate is reduced, the prepared surfactant is poor in transparency, and the layering is unstable at low temperature. Specifically, in the aqueous solution of the alkali, the mass concentration of the alkali may be as follows: 15%, 18%, 20%, 23%, 24%, 25%, 27%, 30%, 33%, 34%, 36%, 37%, 40%, 42%, 45%.

Preferably, when the average saponification value of the vegetable oil and fat is greater than or equal to 210mgKOH/g, the sum of the weight percentages of the vegetable oil and fat and the reaction promoter is less than 42%, and the mass concentration of the alkali in the aqueous solution of the alkali is 15-25%; more preferably, the mass concentration of the alkali in the aqueous solution of the alkali is 18-23%.

When the average saponification value of the vegetable oil is less than 210mgKOH/g, the sum of the weight percentages of the vegetable oil and the reaction promoter is less than 36%, and the mass concentration of the alkali in the aqueous solution of the alkali is 20-45%. More preferably, the alkali concentration in the aqueous solution of alkali is 30 to 42% by mass.

It is understood that the average saponification value is (a)₁Saponification value of vegetable oil and fat₁％+A₂Saponification value of vegetable oil and fat₂％+……+A_nSaponification value of vegetable oil and fat_n)/(a₁％+a₂+……+a_n%). Wherein, a₁Is represented by A₁The weight percentage of the vegetable oil and fat used, a₂Is represented by A₂The weight percentage of the vegetable oil and fat used, a_nIs represented by A_nThe weight percentage of the vegetable oil is used. The term "saponification value" refers to: mg of potassium hydroxide in mg/KOHg required for complete saponification of 1 g of vegetable oil and fat.

In one particular embodiment, the base is selected from at least one of potassium hydroxide, sodium hydroxide, and ethanolamine.

In one specific embodiment, in step (2), the step of adding water for dilution comprises:

It is understood that the "residual water" in the "5 to 8% by weight of residual water" means the amount of water remaining after the removal of process water before the present step, for example, the removal of the water for preparing the aqueous alkali solution, based on the total amount of the water used. The "remaining water" refers to water used for the process prior to the present step, such as water for preparing an aqueous solution from which the alkali is removed and water remaining after the preliminary dilution, on the basis of the total amount of the water used.

In one specific embodiment, in the step (1), the mixed solution of the alkali and the water is heated to 65-70 ℃ and then added.

The vegetable oil surfactant is transparent liquid, reserves abundant natural skin care ingredients, and simultaneously achieves the effects of effectively cleaning skin and nourishing skin, and the liquid form is convenient for a formulator to prepare and produce a cleaning product, so that the used domestic sewage can be decomposed under natural conditions, is environment-friendly and harmless, and accords with the development trend of the surfactant.

In the following specific examples, all the starting materials used are commercially available products unless otherwise specified.

Example 1

The embodiment is a preparation method of a vegetable oil surfactant, which comprises the following steps:

(1) the adopted raw material compatibility is as follows: 20g of palm kernel oil, 6.7g of potassium hydroxide, 6g of reaction accelerator cocoanut oil acid and 67.3g of water; adding the potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

(2) Adding the reaction promoter and the vegetable oil into a vegetable oil pot, stirring and heating to 60-85 ℃, then adding the alkali liquor with the temperature of 65-70 ℃, gradually thickening in the pot along with the addition of the alkali liquor, fully stirring the material in the pot, and reacting for 3 hours at the temperature of 80-95 ℃;

(3) Then adding 5-8% of the residual water to dilute the materials in the pot, stirring for 40 minutes, adding the residual water, and gradually diluting the materials in the pot to be clear; the green vegetable oil surfactant for cleaning skin is obtained.

Example 2

(1) the adopted raw material compatibility is as follows: 10g of palm kernel oil, 10g of olive oil, 6.4g of potassium hydroxide, 6g of coconut oil acid serving as a reaction accelerator and 67.6g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 38%.

Example 3

(1) The adopted raw material compatibility is as follows: 10g of palm kernel oil, 10g of coconut oil, 7.2g of potassium hydroxide, 6g of reaction accelerator cocoanut oil acid and 66.8g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

Example 4

(1) the adopted raw material compatibility is as follows: 20g of palm kernel oil, 7.4g of potassium hydroxide, 6g of reaction accelerator lauric acid and 66.6g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

Example 5

(1) the adopted raw material compatibility is as follows: 20g of palm kernel oil, 7.4g of potassium hydroxide, 6g of reaction accelerator lauroyl glutamic acid and 66.6g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

Example 6

(1) The adopted raw material compatibility is as follows: 20g of palm kernel oil, 5.9g of potassium hydroxide, 6g of reaction accelerator laureth-6-carboxylic acid and 68.1g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

Example 7

(1) the adopted raw material compatibility is as follows: 20g of palm kernel oil, 5.8g of potassium hydroxide, 5.5g of reaction accelerator laureth-6-carboxylic acid, 0.5g of glycerol monolaurate and 68.2g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

Example 8

(1) the adopted raw material compatibility is as follows: 20g of coconut oil, 6.3g of potassium hydroxide, 0.2g of reaction accelerator glycerol monolaurate and 73.5g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

Comparative example 1

The comparative example is a preparation method of a vegetable oil surfactant, and the raw materials and the steps are similar to those of example 1, except that: the reaction promoter is high carbon fatty acid behenic acid.

The method comprises the following specific steps:

(1) the adopted raw material compatibility is as follows: 20g of palm kernel oil, 6.7g of potassium hydroxide, 6g of reaction accelerator behenic acid and 67.3g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

(3) then adding 5-8% of the residual water to dilute the materials in the pot, stirring for 40 minutes, and adding the residual water; the green vegetable oil surfactant for cleaning skin is obtained.

Comparative example 2

The comparative example is a preparation method of a vegetable oil surfactant, and the raw materials and the steps are similar to those of example 2, except that: the concentration of the prepared alkali liquor is 10 percent.

The method comprises the following specific steps

1) The adopted raw material compatibility is as follows: 10g of palm kernel oil, 10g of olive oil, 6.4g of potassium hydroxide, 6g of coconut oil acid serving as a reaction accelerator and 67.6g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 10%.

Comparative example 3

The comparative example is a preparation method of liquid potassium soap, and is mainly different from the example 1 in that the vegetable oil palm kernel oil is changed into refined corresponding fatty acid, namely lauric acid, and the specific steps are as follows

(1) The raw material compatibility is as follows (weight percentage): 20g of lauric acid, 8.6g of potassium hydroxide, 6g of coconut oil acid and 65.4g of water; adding potassium hydroxide into a proper amount of water to prepare alkali liquor with the mass concentration of 20%.

(2) Adding the lauric acid and the coconut oil fatty acid into an oil pot, stirring and heating to 60-85 ℃, then adding the alkali liquor with the temperature of 65-70 ℃, gradually thickening the pot along with the addition of the alkali liquor, fully stirring the materials in the pot, and reacting for 3 hours at the temperature of 80-95 ℃;

(3) then adding 5-8% of the residual amount of water (same as example 1), stirring for 40 minutes, and adding the residual amount of water; thus obtaining the liquid potassium soap.

The performance of the vegetable oil surfactants prepared in examples 1-8 and comparative examples 1-2 was compared, and the results are shown in table 1 below:

TABLE 1

As can be seen from Table 1, the vegetable oil surfactants prepared in examples 1 to 8 are all transparent liquids and have good low-temperature performance, and the vegetable oil surfactants prepared in comparative examples 1 to 2 are all opaque liquids and have poor low-temperature performance. The reason is that the liquid prepared by the comparative examples 1-2 is opaque, which indicates that the vegetable oil does not completely react. In addition, it is understood from the analysis example 1 and the comparative example 1 that different reaction promoters have an influence on the degree of reaction of vegetable oils and fats, and the analysis example 2 and the comparative example 2 that the concentration of alkali liquid is important in the reaction system, and the transparency of liquids prepared at different concentrations is different.

The vegetable oil and fat surfactant obtained in example 1 and the liquid potassium soap obtained in comparative example 3 were subjected to a post-washing moisture retention test:

test objects: three professional testers;

test samples: respectively diluting the finished products prepared in the example 1 and the comparative example 3 with water until the mass fraction is 1%;

the test method comprises the following steps: three professional testers were asked to use the test samples to wash the facial skin and test the moisturizing effect after washing.

The results are shown in table 2 below:

TABLE 2

Experimental data show that after the facial skin is cleaned by the vegetable oil surfactant aqueous solution prepared in the 1% embodiment 1, the facial skin still has a certain moisture-retaining capacity within 4 hours, and after the facial skin is cleaned by the liquid potassium soap aqueous solution prepared in the 1% comparative example, the facial skin is relatively dry, the moisture-retaining effect is not achieved, but the degreasing force is strong, and the main reason is that the liquid potassium soap prepared by the refined fatty acid has no moisture-retaining nourishing components, so that the degreasing force after cleaning is strong.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A preparation method of a vegetable oil surfactant is characterized by comprising the following steps:

2. The method for preparing a vegetable oil surfactant according to claim 1, wherein the C8-C18 fatty acid is selected from one or more of lauric acid, coconut oil acid, palmitic acid, stearic acid, and oleic acid; and/or the presence of a catalyst in the reaction mixture,

The C8-C18 fatty acyl amino acid is selected from at least one of lauroyl glutamic acid, lauroyl glycine, cocoyl glutamic acid and myristoyl glutamic acid; and/or the presence of a catalyst in the reaction mixture,

the C8-C18 fatty alcohol polyether carboxylic acid is selected from at least one of laureth-6 carboxylic acid, laureth-11 carboxylic acid, laureth-10 carboxylic acid and laureth-10 carboxylic acid; and/or the presence of a catalyst in the reaction mixture,

the C8-18 fatty acid glyceride is at least one selected from glycerol monolaurate, glycerol dilaurate, glycerol monostearate, and glycerol monopalmitate.

3. The method for producing a vegetable oil and fat surfactant according to claim 1, wherein the saponification value of the vegetable oil and fat is greater than 180 mgKOH/g.

4. The method for producing a vegetable oil or fat surfactant according to claim 1, wherein the alkali is at least one selected from the group consisting of potassium hydroxide, sodium hydroxide and ethanolamine.

5. The method for producing a vegetable oil or fat surfactant according to claim 1, wherein in the step (1), the aqueous alkali solution has a concentration of 15 to 48% by mass of the alkali.

6. The method for preparing the vegetable oil surfactant according to claim 1, wherein the amount of the reaction accelerator is 0.1 to 35 wt%, the amount of the vegetable oil is 2 to 40 wt%, the amount of the alkali is 5 to 15 wt%, and the total amount of the water is 30 to 60 wt%.

7. The method according to claim 6, wherein when the average saponification value of the vegetable oil is 210mgKOH/g or more, the sum of the weight percentages of the vegetable oil and the reaction accelerator is less than 42%, and the mass concentration of the alkali in the aqueous solution of the alkali is 15 to 25%;

8. The method for producing the vegetable fat and oil surfactant according to any one of claims 6 to 7, wherein in the step (2), the step of adding water for dilution comprises:

9. The method for producing a vegetable oil surfactant according to any one of claims 1 to 7, wherein the reaction in the step (1) is carried out at a temperature of 80 to 95 ℃ for 3 to 4 hours.

10. A vegetable oil and fat surfactant produced by the production method according to any one of claims 1 to 9.