Paraffin emulsifier as well as preparation method and application thereof

Abstract

The invention relates to the technical field of emulsifiers, and discloses a paraffin emulsifier and a preparation method and application thereof, the preparation method comprises the following steps: respectively reacting stearic acid with dehydrated castor oil and starch to generate stearic castor oil ester and stearic starch ester; heating castor oil stearate in an inert gas atmosphere, then dropwise adding a mixture of a vinyl monomer, a vinyl acetate monomer and an initiator, and carrying out a heat preservation reaction to obtain a polymer modified product; dispersing stearic acid, urea, inorganic bentonite and an alkaline substance into a solvent to obtain a composite dispersion liquid; dropwise adding the polymer modified product and starch stearate into the composite dispersion liquid at the same time, reacting to obtain a hybrid emulsifier precursor, and performing spray drying on the hybrid emulsifier precursor to obtain a paraffin emulsifier; according to the preparation method provided by the invention, efficient and stable preparation of the paraffin emulsifier is realized through multi-component collaborative design and step-by-step accurate regulation and control, and the preparation method has the advantages of environmental friendliness, economical efficiency and wide applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of emulsifiers, in particular to a paraffin emulsifier and a preparation method and application thereof. Background Art

[0002] Paraffin wax is a long-chain compound with a straight-chain hydrocarbon structure. It does not contain hydrophilic groups in its molecules and is extremely oily. The emulsification of paraffin wax is to disperse it in water, change its surface tension with the help of the directional adsorption effect of the emulsifier, and form a highly dispersed, uniform, and stable emulsion under the action of mechanical external forces. The production of paraffin wax emulsion is already a fairly mature process and can be used in industries and fields such as papermaking, leather, wood, agriculture, explosives, medicine, ceramics, cosmetics, and automobile protection. Existing methods for emulsifying paraffin include: (1) surfactant emulsification method; this method uses surfactants (amphiphilic molecules) to adsorb on the interface between paraffin wax (oil phase) and water phase to reduce interfacial tension and form a stable water-in-oil (O / W) or oil-in-water (W / O) emulsion. (2) polymer emulsifier method; this method uses natural or synthetic polymer compounds to form a physical barrier (steric hindrance) at the oil-water interface to prevent droplet aggregation. (3) Phase transition temperature method (PIT method); This method changes the hydrophilicity and lipophilicity of nonionic surfactants by adjusting the temperature, prepares nanoemulsions near the phase transition temperature, and locks the structure after cooling. (4) High-energy mechanical emulsification method; This method breaks paraffin into micron or nanometer droplets by applying high-intensity mechanical forces (shear, impact, cavitation) and disperses them in water. (5) Self-emulsification method; This method introduces hydrophilic groups by chemically modifying paraffin (such as oxidation and sulfonation), causing it to spontaneously disperse in water to form an emulsion. (6) Pickering emulsion method; This method uses nano / micrometer-sized solid particles (such as silica, clay) to be adsorbed on the oil-water interface to form a physical barrier to stabilize the emulsion.

[0003] Existing methods of emulsifying paraffin have more or less shortcomings in terms of cost and environmental friendliness. In addition, the specific method to be chosen for emulsifying paraffin usually needs to consider the actual application scenario. Taking the use of emulsified paraffin in the production of artificial boards as an example, a certain amount of emulsified paraffin is mixed with the sizing agent into the wood fiber or sawdust to make the pressed artificial boards water-resistant and improve the surface finish. However, the existing emulsified paraffin may have a high hygroscopicity due to its strong hydrophilicity, which will cause the water absorption and expansion rate of the artificial boards to be too large. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of existing paraffin emulsifiers in taking both cost and environmental protection into account, and to provide a paraffin emulsifier and a preparation method thereof. The paraffin emulsifier prepared by the method provided by the present invention can take both cost and environmental protection into account at the same time and has good application prospects.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for preparing a paraffin emulsifier, comprising:

[0007] Stearic acid is reacted with dehydrated castor oil and starch respectively to generate castor oil stearate and starch stearate;

[0008] heating the castor oil stearate in an inert gas atmosphere, then adding dropwise a mixture of vinyl monomer, vinyl acetate monomer and initiator, and reacting at the same temperature to obtain a polymer modified product;

[0009] dispersing stearic acid, urea, inorganic bentonite and alkaline material in a solvent to obtain a composite dispersion;

[0010] The polymer modified product and stearic acid starch ester are simultaneously added dropwise to the composite dispersion to react to obtain a hybrid emulsifier precursor, which is then spray-dried to obtain a paraffin emulsifier.

[0011] Preferably, the reaction for producing castor oil stearate comprises: in an inert gas atmosphere, mixing 10-15 parts by weight of stearic acid and 0.01 parts by weight of phosphoric acid and heating to 150° C., adding dropwise 5-10 parts by weight of dehydrated castor oil over 1 hour under stirring, and then maintaining the temperature for reaction to obtain castor oil stearate.

[0012] Preferably, the reaction for producing stearic acid starch ester comprises: heating 5-10 parts by weight of stearic acid to 150° C. in an inert gas atmosphere, adding 0.1 parts by weight of phosphoric acid after the stearic acid is completely melted, and then adding 3-7 parts by weight of starch, and reacting at this temperature to obtain stearic acid starch ester.

[0013] Preferably, the composite dispersion comprises the following raw materials in parts by weight: 2-5 parts by weight of stearic acid, 2-5 parts by weight of urea, 4-6 parts by weight of inorganic bentonite, 2-3 parts by weight of alkaline substance, and 40-60 parts by weight of solvent;

[0014] Preferably, the alkaline substance is sodium hydroxide; and the solvent is water.

[0015] Preferably, the vinyl monomer is selected from at least one of acrylic acid, methyl acrylate, methyl methacrylate, and styrene;

[0016] Preferably, the initiator is benzoyl peroxide.

[0017] Preferably, the weight ratio of the castor oil stearate to the mixture is (3-1):1.

[0018] Preferably, the conditions for preparing the hybrid emulsifier precursor include: heating the composite dispersion to 40°C, heating the polymer-modified product and stearic acid starch ester to 150°C, and then simultaneously adding them dropwise to the composite dispersion; after the addition is completed, maintaining the temperature at 80°C and stirring until the solid content is not less than 50%, thereby obtaining the hybrid emulsifier precursor.

[0019] Preferably, the spray drying conditions include: an inlet air temperature of 150°C.

[0020] The present invention also provides a paraffin emulsifier prepared according to the above preparation method.

[0021] The present invention also provides a use of the paraffin emulsifier in preparing emulsified paraffin.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] 1. Existing emulsifiers use petroleum-based products: such as Tween 80, Span 80, fatty acid polyoxyethylene ether and other raw materials. The cost of these raw materials is between 12-25 yuan / kg. In comparison, the starch of this product is about 3.5 yuan / kg, the acrylic monomer styrene is 10 yuan / kg, the vinyl acetate is 6 yuan / kg, and the bentonite is 1.4 yuan / kg, which is about 50% cheaper.

[0024] 2. According to the preparation method provided by the present invention, by introducing bio-based raw materials such as castor oil and starch, compared with petroleum-based raw materials, they are renewable and more environmentally friendly;

[0025] 3. In the present invention, inorganic bentonite is introduced, and its layered structure can adsorb organic matter, thereby further improving the storage stability of the emulsified paraffin prepared based on the emulsifier.

[0026] 4. In the present invention, stearic acid and castor oil can undergo an esterification reaction under the condition of an acid substance as a catalyst to produce castor oil stearate; by using phosphoric acid as a catalyst, after the esterification reaction is completed, the residual phosphoric acid can be neutralized by the alkaline substance sodium hydroxide to form sodium phosphate salt, and the sodium phosphate salt has an antibacterial effect and can effectively prevent the mildew of the board.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further explained below with reference to specific embodiments.

[0029] The endpoints of the ranges and any values ​​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 endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0030] If no specific techniques or conditions are specified in the embodiments of the present invention, the embodiments may be carried out according to the techniques or conditions described in the literature in the art or according to the product instructions.

[0031] As mentioned above, the present invention provides a method for preparing a paraffin emulsifier, the preparation method comprising:

[0032] Stearic acid is reacted with dehydrated castor oil and starch respectively to generate castor oil stearate and starch stearate; the castor oil stearate is heated in an inert gas atmosphere, and then a mixture of vinyl monomer, vinyl acetate monomer and initiator is added dropwise, and the mixture is kept warm for reaction to obtain a polymer modified product; stearic acid, urea, inorganic bentonite and an alkaline substance are dispersed in a solvent to obtain a composite dispersion; the polymer modified product and starch stearate are simultaneously added dropwise to the composite dispersion to react to obtain a hybrid emulsifier precursor, and the hybrid emulsifier precursor is spray-dried to obtain a paraffin emulsifier.

[0033] In the technical solution provided by the present invention, a paraffin emulsifier is prepared by introducing bio-based raw materials such as castor oil and starch. Compared with traditional petroleum-based raw materials, the paraffin emulsifier has the advantages of being renewable and more environmentally friendly. According to the inventor's calculation, the preparation method provided by the present invention has obvious cost advantages compared with traditional emulsifiers. In the present invention, stearic acid reacts with dehydrated castor oil and starch respectively to generate castor oil stearate and starch stearate. In an inert gas atmosphere, castor oil stearate is grafted with vinyl monomer and vinyl acetate through free radical polymerization to form a hydrophobic main chain-polar side chain polymer. This structure can enhance the anchoring ability of the emulsifier to paraffin. force, while being able to stabilize the aqueous phase through polar groups; In the composite dispersion provided by the present invention, stearic acid reacts with alkaline substances (such as NaOH) to generate sodium stearate soap, providing rapid emulsification ability; Urea therein can promote the dispersion of stearic acid and inorganic bentonite, and prevent agglomeration; The layered structure possessed by inorganic bentonite can adsorb organic matter, enhance the thixotropy and high temperature stability of the emulsion; By simultaneously dropping polymer modified product and stearic acid starch ester into the composite dispersion, a hybrid emulsifier is formed by intermolecular forces, achieving wide HLB adaptation, i.e., being suitable for paraffin with different melting points; Coordinating spray drying to improve the storage stability and ease of use of the emulsifier. Compared with the prior art, the preparation method provided by the present invention achieves the preparation of an efficient and stable paraffin emulsifier by multi-component collaborative design and step-by-step precise control, with both environmental protection, economy and wide applicability.

[0034] According to the preparation method provided by the present invention, the reaction for producing castor oil stearate comprises: in an inert gas atmosphere, mixing 10-15 parts by weight of stearic acid and 0.01 parts by weight of phosphoric acid and heating to 150° C., adding 5-10 parts by weight of dehydrated castor oil dropwise over 1 hour under stirring conditions, and then maintaining the temperature for reaction to obtain castor oil stearate.

[0035] According to the preparation method provided by the present invention, the reaction for producing stearic acid starch ester includes: heating 5-10 parts by weight of stearic acid to 150°C in an inert gas atmosphere, adding 0.1 parts by weight of phosphoric acid after the stearic acid is completely melted, and then adding 3-7 parts by weight of starch, and maintaining the temperature for reaction to obtain stearic acid starch ester.

[0036] The inventors of the present application have discovered that by introducing phosphoric acid as a catalyst, after the esterification reaction is completed, the residual phosphoric acid can be neutralized by the alkaline substance sodium hydroxide to form sodium phosphate salt, which has an antibacterial effect and can effectively prevent the mildew of the board;

[0037] In the present invention, the amount of each raw material component in the composite dispersion can be selected within a wide range. In order to ensure the performance of the emulsifier finally prepared, the composite dispersion comprises the following raw materials in parts by weight: 2-5 parts by weight of stearic acid, 2-5 parts by weight of urea, 4-6 parts by weight of inorganic bentonite, 2-3 parts by weight of alkaline substance, and 40-60 parts by weight of solvent.

[0038] In the present invention, the alkaline substance is sodium hydroxide; and the solvent is water.

[0039] It is understandable that in the present invention, in order to improve the efficiency of mixing and dispersion, the solvent can be preheated, for example, the solvent is heated to 40°C, and then stearic acid, urea, inorganic bentonite and alkaline substance are added to the solvent, and stirred and mixed to obtain a composite dispersion.

[0040] In the present invention, the vinyl monomer is a monomer containing a C=C structure. Specifically, the vinyl monomer is at least one selected from acrylic acid, methyl acrylate, methyl methacrylate, and styrene.

[0041] In the present invention, the initiator is benzoyl peroxide.

[0042] In the present invention, the weight ratio of the castor oil stearate to the mixture is (3-1):1.

[0043] In the present invention, the conditions for preparing the hybrid emulsifier precursor include: heating the composite dispersion to 40°C, heating the polymer modified product and stearic acid starch ester to 150°C, and then simultaneously adding them dropwise to the composite dispersion; after the dropwise addition is completed, maintaining the temperature at 80°C with stirring until the solid content is not less than 50%, thereby obtaining the hybrid emulsifier precursor.

[0044] According to the preparation method provided by the present invention, drying is used to reduce the moisture burden during transportation and use. Compared with freeze-drying, the spray drying provided by the present invention has low energy consumption and is suitable for continuous production, thereby reducing the overall cost. In the present invention, the conditions for the spray drying include: an air inlet temperature of 150°C.

[0045] The preparation method of the paraffin emulsifier provided by the present invention is further illustrated below through specific examples.

[0046] Unless otherwise specified, the raw materials used in the following examples are common commercially available products.

[0047] Stearic acid: purchased from Guangzhou Jucheng Chemical Co., Ltd.

[0048] Phosphoric acid: purchased from Guangzhou Guanghua Technology Co., Ltd.

[0049] Dehydrated castor oil: purchased from Jining Huakai Resin Co., Ltd.

[0050] Starch: purchased from Hebei Xingbai Pharmaceutical Group;

[0051] Styrene: purchased from Sinopharm Chemical Reagent Co., Ltd.

[0052] Acrylic acid: purchased from Shandong Mingyue Chemical Co., Ltd.

[0053] Methyl methacrylate: purchased from tricyclic resin;

[0054] Vinyl acetate: purchased from Beijing Bailingwei Technology Co., Ltd.

[0055] Benzoyl peroxide: purchased from Guangzhou Sanming Chemical Co., Ltd.

[0056] Inorganic bentonite: purchased from Zhejiang Fenghong;

[0057] Urea: purchased from Aladdin (Shanghai), U141075;

[0058] Tween 80, Span 80, polyoxyethylene stearate, and emulsifier O-10 were purchased from Hai'an Petrochemical Plant, Jiangsu Province;

[0059] Stearic acid monoglyceride: content 95%, purchased from Guangzhou Meichen Group Co., Ltd.

[0060] Example 1

[0061] This embodiment provides a method for preparing a paraffin emulsifier, comprising the following steps:

[0062] S1. Under nitrogen as a protective gas, 10 parts by weight of stearic acid and 0.01 parts by weight of phosphoric acid were mixed and heated to 150° C., and 6 parts by weight of dehydrated castor oil were added dropwise over 1 hour with stirring. The mixture was then kept warm for reaction to obtain castor oil stearate.

[0063] Under nitrogen as a protective gas, 10 parts by weight of stearic acid was heated to 150° C., and after the stearic acid was completely melted, 0.1 parts by weight of phosphoric acid was added, and then 6 parts by weight of starch was added. The mixture was kept warm for reaction to obtain stearic acid starch ester.

[0064] S2. Under the condition of nitrogen as a protective gas, heat castor oil stearate, then add dropwise a mixture of vinyl monomer, vinyl acetate monomer and initiator, and keep the temperature to react to obtain a polymer modified product; wherein the amount of each raw material component is: 16.01 parts by weight of castor oil stearate, 2 parts by weight of styrene, 1 part by weight of acrylic acid, 1 part by weight of methyl methacrylate, 4 parts by weight of vinyl acetate, and 0.01 part by weight of initiator benzoyl peroxide.

[0065] S3. Disperse stearic acid, urea, inorganic bentonite and alkaline substance in a solvent at 40° C. to obtain a composite dispersion; wherein the composite dispersion comprises 2 parts by weight of stearic acid, 2 parts by weight of urea, 4 parts by weight of inorganic bentonite, 2 parts by weight of sodium hydroxide and 50 parts by weight of water.

[0066] S4, heating the composite dispersion to 40° C., heating the polymer-modified product and stearic acid starch ester to 150° C., and then simultaneously adding them dropwise to the composite dispersion. After the addition is complete, maintaining the temperature at 80° C. and stirring until the solid content is not less than 50%, thereby obtaining the hybrid emulsifier precursor;

[0067] The hybrid emulsifier precursor was spray-dried (with an inlet air temperature of 150° C.) to obtain a paraffin emulsifier with a solid content of 50%.

[0068] Example 2

[0069] This embodiment provides a method for preparing a paraffin emulsifier, comprising the following steps:

[0070] S1. Under nitrogen as a protective gas, 10 parts by weight of stearic acid and 0.01 parts by weight of phosphoric acid were mixed and heated to 150° C. Under stirring, 8 parts by weight of dehydrated castor oil were added dropwise over 1 hour, followed by insulation reaction to obtain castor oil stearate.

[0071] Under nitrogen as a protective gas, 10 parts by weight of stearic acid was heated to 150° C., and after the stearic acid was completely melted, 0.1 parts by weight of phosphoric acid was added, and then 7 parts by weight of starch was added. The mixture was kept warm for reaction to obtain stearic acid starch ester.

[0072] S2. Under the condition of nitrogen as a protective gas, heat castor oil stearate, then add dropwise a mixture of vinyl monomer, vinyl acetate monomer and initiator, and keep the temperature to react to obtain a polymer modified product; wherein the amount of each raw material component is: 18.01 parts by weight of castor oil stearate, 2 parts by weight of styrene, 2 parts by weight of acrylic acid, 3 parts by weight of vinyl acetate, and 0.01 part by weight of initiator benzoyl peroxide.

[0073] S3. Disperse stearic acid, urea, inorganic bentonite and alkaline substance in a solvent at 40° C. to obtain a composite dispersion; wherein the composite dispersion comprises 2 parts by weight of stearic acid, 2 parts by weight of urea, 4 parts by weight of inorganic bentonite, 2 parts by weight of sodium hydroxide and 50 parts by weight of water.

[0074] S4, heating the composite dispersion to 40° C., heating the polymer-modified product and stearic acid starch ester to 150° C., and then simultaneously adding them dropwise to the composite dispersion. After the addition is complete, maintaining the temperature at 80° C. and stirring until the solid content is not less than 50%, thereby obtaining the hybrid emulsifier precursor;

[0075] The hybrid emulsifier precursor was spray-dried (with an inlet air temperature of 150° C.) to obtain a paraffin emulsifier with a solid content of 50%.

[0076] Example 3

[0077] This embodiment provides a method for preparing a paraffin emulsifier, comprising the following steps:

[0078] S1. Under nitrogen as a protective gas, 10 parts by weight of stearic acid and 0.01 parts by weight of phosphoric acid were mixed and heated to 150° C., and 6 parts by weight of dehydrated castor oil were added dropwise over 1 hour with stirring. The mixture was then kept warm for reaction to obtain castor oil stearate.

[0079] Under nitrogen as a protective gas, 10 parts by weight of stearic acid was heated to 150° C., and after the stearic acid was completely melted, 0.1 parts by weight of phosphoric acid was added, and then 3 parts by weight of starch was added. The mixture was kept warm for reaction to obtain stearic acid starch ester.

[0080] S2. Under the condition of nitrogen as a protective gas, heat castor oil stearate, then add dropwise a mixture of vinyl monomer, vinyl acetate monomer and initiator, and keep the temperature to react to obtain a polymer modified product; wherein the amount of each raw material component is: 16.01 parts by weight of castor oil stearate, 3 parts by weight of styrene, 2 parts by weight of acrylic acid, 2 parts by weight of methyl methacrylate, 4 parts by weight of vinyl acetate, and 0.01 part by weight of initiator benzoyl peroxide.

[0081] S3. Disperse stearic acid, urea, inorganic bentonite and alkaline substance in a solvent at 40° C. to obtain a composite dispersion; wherein the composite dispersion comprises 2 parts by weight of stearic acid, 2 parts by weight of urea, 4 parts by weight of inorganic bentonite, 2 parts by weight of sodium hydroxide and 50 parts by weight of water.

[0082] S4, heating the composite dispersion to 40° C., heating the polymer-modified product and stearic acid starch ester to 150° C., and then simultaneously adding them dropwise to the composite dispersion. After the addition is complete, maintaining the temperature at 80° C. and stirring until the solid content is not less than 50%, thereby obtaining the hybrid emulsifier precursor;

[0083] The hybrid emulsifier precursor was spray-dried (with an inlet air temperature of 150° C.) to obtain a paraffin emulsifier with a solid content of 50%.

[0084] Comparative Example 1

[0085] Comparative Example 1 is a traditional paraffin emulsifier, and its specific composition (in parts by weight) is as follows:

[0086] 30 parts by weight of Tween 80, 20 parts by weight of Span 80, 10 parts by weight of emulsifier O-10, 30 parts by weight of stearic acid monoglyceride, and 10 parts by weight of stearic acid polyoxyethylene ether.

[0087] The preparation method is as follows: Tween 80, Span 80, emulsifier O-10, stearic acid monoglyceride and stearic acid polyoxyethylene ether are mixed and stirred to obtain a paraffin emulsifier.

[0088] Comparative Example 2

[0089] Comparative Example 2 is a commercially available emulsifier purchased from Shanghai Greening Chemical Technology Co., Ltd. with the trade name GR-200B.

[0090] Application examples:

[0091] 100 parts of paraffin wax (No. 56 paraffin wax) and 100 parts of water were stirred at 90° C. until the paraffin wax was completely dissolved, and then 8 parts of the paraffin emulsifiers of Examples 1-3 and Comparative Examples 1-2 were added, and stirred and mixed at a speed of 100 r / min for 30 minutes to obtain an emulsified paraffin aqueous solution.

[0092] In the application examples provided herein: (1) Stability testing was performed according to GB / T 32775-2016, with Grade 1 being the best and Grade 5 being the worst; (2) Water absorption expansion was determined according to GB / T 17657-2022, with the initial thickness of the sample sheet being 8 mm. Specific test data are summarized in Table 1.

[0093] Table 1:

[0094]

[0095] It can be seen from the above test data that the emulsifier prepared by the method provided by the present invention has good economy while taking into account stability and environmental protection, and has a low water absorption expansion rate when suitable for emulsified paraffin and used for wood.

[0096] The basic principles, main features, and characteristics of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a paraffin emulsifier, characterized in that: The preparation method comprises: Stearic acid is reacted with dehydrated castor oil and starch respectively to generate castor oil stearate and starch stearate; heating the castor oil stearate in an inert gas atmosphere, then adding dropwise a mixture of vinyl monomer, vinyl acetate monomer and initiator, and reacting at the same temperature to obtain a polymer modified product; dispersing stearic acid, urea, inorganic bentonite and alkaline material in a solvent to obtain a composite dispersion; The polymer modified product and stearic acid starch ester are simultaneously added dropwise to the composite dispersion to react to obtain a hybrid emulsifier precursor, which is then spray-dried to obtain a paraffin emulsifier.

2. The preparation method according to claim 1, wherein The reaction for producing castor oil stearate comprises: mixing 10-15 parts by weight of stearic acid and 0.01 parts by weight of phosphoric acid in an inert gas atmosphere and heating to 150° C., adding 5-10 parts by weight of dehydrated castor oil dropwise over 1 hour under stirring, and then maintaining the mixture for reaction to produce castor oil stearate.

3. The preparation method according to claim 1, wherein The reaction for producing stearic acid starch ester includes: heating 5-10 parts by weight of stearic acid to 150° C. in an inert gas atmosphere, adding 0.1 parts by weight of phosphoric acid after the stearic acid is completely melted, and then adding 3-7 parts by weight of starch, and keeping the temperature to react to obtain stearic acid starch ester.

4. The preparation method according to claim 1, wherein The composite dispersion comprises the following raw materials in parts by weight: 2-5 parts by weight of stearic acid, 2-5 parts by weight of urea, 4-6 parts by weight of inorganic bentonite, 2-3 parts by weight of alkaline substance, and 40-60 parts by weight of solvent; Preferably, the alkaline substance is sodium hydroxide; and the solvent is water.

5. The preparation method according to claim 1, wherein The vinyl monomer is selected from at least one of acrylic acid, methyl acrylate, methyl methacrylate, and styrene; Preferably, the initiator is benzoyl peroxide.

6. The preparation method according to claim 1, wherein The weight ratio of the castor oil stearate to the mixture is (3-1):

1.

7. The preparation method according to claim 1, wherein The conditions for preparing the hybrid emulsifier precursor include: heating the composite dispersion to 40°C, heating the polymer modified product and stearic acid starch ester to 150°C, and then simultaneously adding them dropwise to the composite dispersion; after the addition is completed, maintaining the temperature at 80°C and stirring until the solid content is not less than 50%, thereby obtaining the hybrid emulsifier precursor.

8. The preparation method according to claim 1, wherein The spray drying conditions include: an inlet air temperature of 150°C.

9. The paraffin emulsifier prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the paraffin emulsifier according to claim 9 in the preparation of emulsified paraffin.

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