Preparation method of gamma-cyclodextrin-based dendrimer with core-shell structure and fragrance-retaining microcapsule

Abstract

The invention provides a preparation method of a gamma-cyclodextrin-based dendrimer with a core-shell structure and a fragrance-retaining microcapsule, and belongs to the technical field of essences, and the preparation method comprises the following steps: adding oxalyl chloride into a reaction container, adding gamma-cyclodextrin for multiple times, continuously stirring in a water bath condition, removing hydrogen chloride gas at the tail end of the reaction container, and reacting for 20-90 minutes; raising the temperature of the water bath, adding a certain amount of long-chain alcohol, reacting for 90-180 minutes, adding absolute ethyl alcohol, continuously reacting, stopping heating in the water bath, and cooling to room temperature; and neutralizing hydrogen chloride generated after the reaction in the reaction container by using a saturated sodium bicarbonate solution, washing with a large amount of water until no obvious white turbidity exists when silver nitrate is dropped into the water-washing filtrate, and drying to obtain the gamma-cyclodextrin-based dendrimer with the core-shell structure. According to the treatment scheme, under the action of hydrogen bonds and Van der Waals force, the essence has higher adhesion when making contact with the fabric, and therefore the fragrance retention time of the essence on the fabric is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of flavors, and in particular to a core-shell structured γ-cyclodextrin-based dendrimer and a method for preparing a core-shell structured γ-cyclodextrin-based dendrimer fragrance-retaining microcapsule. Background Art

[0002] In the detergent market, with the improvement of living standards, people not only pursue the washing effect of laundry detergent, but also hope to leave a pleasant and lasting fragrance after washing. Fragrance plays a vital role in daily chemical products, but fragrance is easily affected by the external environment and deteriorates. Fragrance microencapsulation can improve the stability of fragrance, reduce contact with the outside world, and under certain circumstances, it can also effectively improve the effect of retaining fragrance. There are many wall materials for microcapsules, and cyclodextrin has attracted widespread attention due to its unique cavity structure. Cyclodextrin is a general term for a series of cyclic oligosaccharides generated by amylose under the action of cyclodextrin glucosyltransferase produced by Bacillus, usually containing 6 to 12 D-pyranose units. Among them, the molecules containing 6, 7, and 8 glucose units are more studied and have important practical significance, which are called α-, β-, and γ-cyclodextrin, respectively. Among them, β-cyclodextrin has a low production cost and is relatively studied, but its solubility in water is poor. The cavity of γ-cyclodextrin (γ-CD) molecule is relatively large, but due to its difficulty in mass production, there are few related application studies. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing laundry detergent essence microcapsules with long-lasting fragrance, thereby overcoming the problem of short fragrance retention time of existing laundry detergents. The present invention provides a core-shell structured γ-cyclodextrin-based dendrimer and a method for preparing a core-shell structured γ-cyclodextrin-based dendrimer fragrance microcapsule. Due to the large molecular weight and multi-branched structure of the core-shell structured γ-cyclodextrin-based dendrimer, the core-shell structured γ-cyclodextrin-based dendrimer can be used as a wall material for microcapsules to wrap essence, and has stronger adhesion when in contact with fabrics under the action of hydrogen bonds and van der Waals forces. The microcapsule can be applied to laundry detergent, thereby extending the fragrance retention time of the essence on the fabric.

[0004] In order to achieve the above object, the present invention provides a method for preparing a core-shell structured γ-cyclodextrin-based dendrimer, comprising:

[0005] (1) After adding oxalyl chloride into a reaction vessel, γ-cyclodextrin is added in multiple portions, the solution in the reaction vessel is continuously stirred in a water bath at 25° C. to 40° C., and hydrogen chloride gas is removed at the end of the reaction vessel, and the reaction is continued for 20 to 90 minutes;

[0006] (2) raising the water bath temperature to 50°C-70°C, adding a certain amount of long-chain alcohol, reacting for 90-180 minutes, then adding a certain amount of anhydrous ethanol, continuing the reaction for 40-90 minutes, turning off the water bath heating, and cooling to room temperature;

[0007] (3) neutralizing the hydrogen chloride generated after the reaction in the reaction container with a saturated sodium bicarbonate solution and washing with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the washed filtrate, and drying to obtain a core-shell structured γ-cyclodextrin-based dendrimer.

[0008] In one embodiment, the weight ratio of each component is: 5 parts of γ-cyclodextrin, 20-40 parts of oxalyl chloride, 2-50 parts of long-chain alcohol, and 0-10 parts of ethanol.

[0009] In one embodiment, the long-chain alcohol is at least one of hexadecanol, stearyl alcohol, eicosanol, and behenyl alcohol.

[0010] In one embodiment, after oxalyl chloride is added to the reaction vessel, γ-cyclodextrin is added three times at intervals of 1-10 minutes.

[0011] A method for preparing a fragrance-retaining microcapsule, comprising: S1, dissolving a certain amount of core-shell structured γ-cyclodextrin-based dendrimers in deionized water, and performing high-speed shearing using a homogenizer; the core-shell structured γ-cyclodextrin-based dendrimers are prepared by the above-mentioned preparation method;

[0012] S2, dissolving the surfactant in deionized water to obtain a surfactant solution, then adding a certain amount of flavor, and using an ultrasonic device to evenly disperse the flavor in the surfactant solution;

[0013] S3, mixing the solutions obtained in S1 and S2 in a preset ratio and stirring them continuously to obtain a stable microcapsule solution, and then vacuum drying the solution to obtain fragrance-retaining microcapsules.

[0014] In one embodiment, the weight portion of the core-shell structured γ-cyclodextrin-based dendrimer added is 5 parts, the weight portion of deionized water is 20-500 parts, the homogenization efficiency is 5000-20000 rpm, and the homogenization time is 1-10 min.

[0015] In one embodiment, the weight portion of the surfactant is 5-30 parts, the weight portion of deionized water is 5-30 parts, and the weight portion of the flavor is 1-15 parts.

[0016] In one embodiment, in S3, the stirring condition is 200-1000 rpm, the stirring temperature is 40°C-90°C, the stirring time is 3-20h, and the ratio of the solution of S1 to the solution of S2 is...

[0017] In one embodiment, the surfactant is at least one of sodium lauryl sulfate, Tween 80, and Tween 20; and the flavor is an oil-soluble flavor.

[0018] In one embodiment, the flavor is at least one of lavender flavor, gardenia flavor, rosemary flavor, bluebell flavor, and eugenol flavor.

[0019] Compared with the prior art, the advantages of the present invention are: a core-shell structure γ-cyclodextrin-based dendrimer is prepared, and the obtained dendrimer has the conical pores and dendritic structure of cyclodextrin. Due to the action of hydrogen bonds and van der Waals forces, it has stronger adhesion when in contact with fabrics. The core-shell structure γ-cyclodextrin-based dendrimer is used as a wall material of a microcapsule to wrap an oil-soluble flavor and is applied to laundry detergent, thereby extending the fragrance retention time of the flavor on the fabric. And the core-shell structure γ-cyclodextrin-based dendrimer can be used as a wall material of a microcapsule to wrap the flavor due to its large molecular weight and multi-branched structure. Due to the action of hydrogen bonds and van der Waals forces, it has stronger adhesion when in contact with fabrics. This microcapsule can be applied to laundry detergent to extend the fragrance retention time of the flavor on the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a morphological characteristic diagram of the core-shell structure γ-cyclodextrin-based dendrimer fragrance-retaining microcapsule in an embodiment of the present invention;

[0022] Figure 2 is an infrared spectrum of octadecanol, γ-cyclodextrin and γ-cyclodextrin dendrimer in the embodiments of the present invention;

[0023] Figure 3 This is a thermogravimetric analysis diagram of the core-shell structure γ-cyclodextrin-based dendrimer fragrance-retaining microcapsules in the embodiment of the present invention;

[0024] Figure 4 It is a sensory evaluation comparison chart of the fragrance retention time of the fragrance and the fragrance microcapsule in the embodiments of the present invention. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0027] It should be noted that various aspects of the embodiments within the scope of protection of the present invention are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0030] The present application provides a method for preparing a core-shell structured γ-cyclodextrin-based dendrimer, which comprises:

[0031] (1) After adding oxalyl chloride into a reaction vessel, γ-cyclodextrin is added in multiple portions, the solution in the reaction vessel is continuously stirred in a water bath at 25° C. to 40° C., and hydrogen chloride gas is removed at the end of the reaction vessel, and the reaction is continued for 20 to 90 minutes;

[0032] (2) raising the water bath temperature to 50°C-70°C, adding a certain amount of long-chain alcohol, reacting for 90-180 minutes, then adding a certain amount of anhydrous ethanol, continuing the reaction for 40-90 minutes, turning off the water bath heating, and cooling to room temperature;

[0033] (3) neutralizing the hydrogen chloride generated after the reaction in the reaction container with a saturated sodium bicarbonate solution and washing with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the washed filtrate, and drying the solution system obtained by the reaction to obtain a core-shell structured γ-cyclodextrin-based dendrimer.

[0034] In one embodiment, the weight ratio of each component is: 5 parts of γ-cyclodextrin, 20-40 parts of oxalyl chloride, 2-50 parts of polyol, and 0-10 parts of ethanol.

[0035] In one embodiment, the long-chain alcohol is at least one of hexadecanol, octadecyl alcohol, eicosanol, and docosanol. The long-chain alcohol can be normal alcohol, isoalcohol, or branched alcohol. The long-chain alcohol is selected based on the ability to be grafted with γ-cyclodextrin to form a multi-branch structure, thereby being used as a wall material to embed the flavor.

[0036] In one embodiment, after oxalyl chloride is added to the reaction vessel, γ-cyclodextrin is added three times at intervals of 1-10 minutes. γ-cyclodextrin is added when the reaction between γ-cyclodextrin and oxalyl chloride does not boil violently.

[0037] A method for preparing a fragrance-retaining microcapsule, comprising: S1, dissolving a certain amount of core-shell structured γ-cyclodextrin-based dendrimers in deionized water, and performing high-speed shearing using a homogenizer; the core-shell structured γ-cyclodextrin-based dendrimers are prepared by the above-mentioned preparation method;

[0038] S2, dissolving the surfactant in deionized water to obtain a surfactant solution, then adding a certain amount of flavor, and using an ultrasonic device to evenly disperse the flavor in the surfactant solution;

[0039] S3, mixing the solutions obtained in S1 and S2 in a preset ratio and stirring them continuously to obtain a stable microcapsule solution, and then vacuum drying the solution to obtain fragrance-retaining microcapsules, wherein the morphological characteristics of the fragrance-retaining microcapsules are shown in FIG. Figure 1 shown.

[0040] In one embodiment, the weight portion of the core-shell structured γ-cyclodextrin-based dendrimer added is 5 parts, the weight portion of deionized water is 20-500 parts, the homogenization efficiency is 5000-20000 rpm, and the homogenization time is 1-10 min.

[0041] In one embodiment, the weight portion of the surfactant is 5-30 parts, the weight portion of deionized water is 5-30 parts, and the weight portion of the flavor is 1-15 parts.

[0042] In one embodiment, in S3, the stirring condition is 200-1000 rpm, the stirring temperature is 40°C-90°C, the stirring time is 3-20h, and the ratio of the solution of S1 to the solution of S2 is...

[0043] In one embodiment, the surfactant is at least one of sodium lauryl sulfate, Tween 80 (polysorbate 80), and Tween 20 (polysorbate 20); and the flavor is an oil-soluble flavor.

[0044] In one embodiment, the flavor is at least one of lavender flavor, gardenia flavor, rosemary flavor, bluebell flavor, and eugenol flavor.

[0045] The above preparation method prepares a core-shell structured γ-cyclodextrin-based dendrimer. The obtained dendrimer has the conical pores and dendritic structure of cyclodextrin. Due to the action of hydrogen bonds and van der Waals forces, it has stronger adhesion when in contact with fabrics. The core-shell structured γ-cyclodextrin-based dendrimer is used as a wall material of a microcapsule to encapsulate oil-soluble flavors and is applied to laundry detergent, thereby extending the fragrance retention time of the flavor on the fabric. And the core-shell structured γ-cyclodextrin-based dendrimer can be used as a wall material of a microcapsule to encapsulate flavors due to its large molecular weight and multi-branched structure. Due to the action of hydrogen bonds and van der Waals forces, it has stronger adhesion when in contact with fabrics. This microcapsule can be applied to laundry detergent to extend the fragrance retention time of the flavor on the fabric.

[0046] Example 1

[0047] Add 25g of oxalyl chloride to a 100mL round-bottom flask, add 5g of γ-CD three times at 5min intervals, stir continuously in a 40℃ water bath, and remove hydrogen chloride gas with a balloon at the end of the round-bottom flask. After reacting for 1h, increase the water bath temperature to 60℃ and add a certain amount of octadecyl alcohol. After reacting for 2h, add 5mL of anhydrous ethanol, continue to react for 1h, turn off the water bath heating, and cool to room temperature. Use saturated sodium bicarbonate solution to neutralize the hydrogen chloride in the system and wash with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the filtrate, and dry it for use.

[0048] The fragrance microcapsules were prepared by inclusion complexation method. 0.25g of cyclodextrin dendrimer was dissolved in 30g of deionized water and sheared at high speed by homogenizer. 0.25g of sodium dodecyl sulfate was dissolved in 30g of deionized water to obtain a surfactant solution. 0.1g of lavender essence was added and the essence was evenly dispersed in the surfactant solution by ultrasonic instrument. The mixture was evenly mixed and stirred continuously. The microcapsule solution was vacuum dried to obtain fragrance microcapsule powder.

[0049] Example 2

[0050] Add 30g of oxalyl chloride to a 100mL round-bottom flask, add 5g of γ-CD three times at intervals of 5min, stir continuously in a 40℃ water bath, and remove the hydrogen chloride gas with a balloon at the end of the round-bottom flask. After reacting for 1.5h, increase the water bath temperature to 70℃ and add a certain amount of hexadecanol. After reacting for 2h, add 10mL of anhydrous ethanol, continue to react for 1.5h, turn off the water bath heating, and cool to room temperature. Use saturated sodium bicarbonate solution to neutralize the hydrogen chloride in the system and wash with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the filtrate, and dry it for use.

[0051] The fragrance microcapsules were prepared by inclusion complexation method. 0.5g of cyclodextrin dendrimer was dissolved in 30g of deionized water and sheared at high speed by homogenizer. 0.25g of sodium dodecyl sulfate was dissolved in 30g of deionized water to obtain a surfactant solution. Then 0.2g of gardenia essence was added. The essence was evenly dispersed in the surfactant solution using an ultrasonic device. The mixture was evenly mixed and stirred continuously. The microcapsule solution was vacuum dried to obtain fragrance microcapsule powder.

[0052] Example 3

[0053] Add 25g of oxalyl chloride to a 100mL round-bottom flask, add 5g of γ-CD three times at 5min intervals, stir continuously in a 40℃ water bath, and remove hydrogen chloride gas with a balloon at the end of the round-bottom flask. After reacting for 1h, increase the water bath temperature to 60℃ and add a certain amount of docosyl alcohol. After reacting for 2h, add 5mL of anhydrous ethanol, continue to react for 1h, turn off the water bath heating, and cool to room temperature. Use saturated sodium bicarbonate solution to neutralize the hydrogen chloride in the system and wash with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the filtrate, and dry it for use.

[0054] The fragrance microcapsules were prepared by inclusion complexation method. 0.25g of cyclodextrin dendrimer was dissolved in 30g of deionized water and sheared at high speed by homogenizer. 0.25g of sodium dodecyl sulfate was dissolved in 30g of deionized water to obtain a surfactant solution. Then 0.1g of blue bell essence was added. The essence was evenly dispersed in the surfactant solution using an ultrasonic device. The mixture was evenly mixed and stirred continuously. The microcapsule solution was vacuum dried to obtain fragrance microcapsule powder.

[0055] Example 4

[0056] Add 10g of oxalyl chloride to a 100mL round-bottom flask, add 5g of γ-CD three times at intervals of 5min, stir continuously in a 30℃ water bath, and remove hydrogen chloride gas with a balloon at the end of the round-bottom flask. After reacting for 1.5h, increase the water bath temperature to 60℃ and add a certain amount of eicosanol. After reacting for 1h, add 20mL of anhydrous ethanol, continue to react for 1.5h, turn off the water bath heating, and cool to room temperature. Use saturated sodium bicarbonate solution to neutralize the hydrogen chloride in the system and wash with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the filtrate, and dry it for use. Prepare flavor microcapsules by inclusion complexation method, take 0.8g of cyclodextrin dendrimers and dissolve them in 60g of deionized water, and shear them at high speed through a homogenizer. Then dissolve 1g of sodium dodecyl sulfate in 30g of deionized water to obtain a surfactant solution, then add 0.3g of eugenol flavor, use an ultrasonic cleaner to evenly disperse the flavor in the surfactant solution, mix evenly and stir continuously. The microcapsule solution is vacuum dried to obtain the essence microcapsule powder.

[0057] Figure 1 The SEM image of lavender essence microcapsules is shown. The lavender essence microcapsules have a full spherical structure in appearance.

[0058] like Figure 2 The infrared spectra of γ-cyclodextrin, octadecyl alcohol, and γ-cyclodextrin dendrimer are shown in Figure 1. The absorption peak of octadecyl alcohol is at 1026 cm -1 The absorption peak of γ-cyclodextrin is at 1063 cm -1 , 1466cm -1 , 2920cm -1 The absorption peak of γ-cyclodextrin dendrimer is at 1055 cm -1 , 1398cm -1 , 1735cm -1 , 2980cm -1 , 1735cm does not appear in the Fourier infrared spectrum of γ-cyclodextrin -1 Absorption peak. The γ-cyclodextrin dendrimer synthesized from γ-cyclodextrin, oxalyl chloride and octadecanol contains an ester structure. This absorption peak representing the ester structure appears in the γ-cyclodextrin dendrimer, proving that the cyclodextrin modification is successful.

[0059] Figure 3The TG and DTG graphs of lavender essence and lavender essence microcapsules are shown. The mass of lavender essence decreases with increasing temperature, which is because lavender essence contains volatile raw materials such as rose ether. The rate of mass reduction of lavender essence is slow in the early stage, and then gradually accelerates. When the temperature is 143.79℃, the mass of lavender essence drops to 50%. The rate of mass reduction of essence in the later stage is accelerated due to the high temperature. When the temperature is 150.79℃, the volatilization rate of essence is the fastest. When the temperature reaches 214.72℃, the essence is almost completely volatilized. The thermogravimetric loss of lavender essence microcapsules occurs twice. The first time occurs between 142.4℃ and 331.74℃. The loss rate first gradually accelerates and then gradually slows down. This weight loss is due to water evaporation and essence decomposition. The second time occurs between 718.8℃ and 800℃. The reason for this thermogravimetric loss may be due to the decomposition of the wall material of lavender essence microcapsules. Therefore, the encapsulation of lavender essence by γ-cyclodextrin dendrimer microcapsules increases the loss temperature range of lavender essence and has a certain protective effect on lavender essence.

[0060] like Figure 4 The figure shows the fragrance retention test of lavender essence and lavender essence on fabric. The fragrance retention time of lavender essence is better than that of lavender essence. The fragrance of lavender essence is not strong after 24 hours, while the fragrance microcapsule is still strong after 72 hours.

[0061] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A method for preparing a core-shell structured γ-cyclodextrin-based dendrimer, characterized in that: include: (1) After adding oxalyl chloride into a reaction vessel, γ-cyclodextrin is added in multiple portions, the solution in the reaction vessel is continuously stirred in a water bath at 25° C. to 40° C., and hydrogen chloride gas is removed at the end of the reaction vessel, and the reaction is continued for 20 to 90 minutes; (2) raising the water bath temperature to 50°C-70°C, adding a certain amount of long-chain alcohol, reacting for 90-180 minutes, then adding a certain amount of anhydrous ethanol, continuing the reaction for 40-90 minutes, turning off the water bath heating, and cooling to room temperature; (3) neutralizing the hydrogen chloride generated after the reaction in the reaction container with a saturated sodium bicarbonate solution and washing with a large amount of water until there is no obvious white turbidity when silver nitrate is dropped into the washed filtrate, and drying to obtain a core-shell structured γ-cyclodextrin-based dendrimer.

2. The preparation method according to claim 1, characterized in that: The weight ratio of each component is: 5 parts of gamma-cyclodextrin, 20-40 parts of oxalyl chloride, 2-50 parts of long-chain alcohol, and 0-10 parts of ethanol.

3. The preparation method according to claim 1, characterized in that: The long-chain alcohol is at least one of hexadecanol, octadecyl alcohol, eicosanol and behenyl alcohol.

4. The preparation method according to claim 1, characterized in that: After oxalyl chloride was added to the reaction vessel, γ-cyclodextrin was added three times at intervals of 1 to 10 minutes.

5. A method for preparing fragrance-retaining microcapsules, characterized in that: include: S1, dissolving a certain amount of core-shell structure γ-cyclodextrin-based dendrimer in deionized water, and performing high-speed shearing using a homogenizer; the core-shell structure γ-cyclodextrin-based dendrimer is prepared by the preparation method of any one of claims 1 to 4; S2, dissolving the surfactant in deionized water to obtain a surfactant solution, then adding a certain amount of flavor, and using an ultrasonic device to evenly disperse the flavor in the surfactant solution; S3, mixing the solutions obtained in S1 and S2 in a preset ratio and stirring them continuously to obtain a stable microcapsule solution, and then vacuum drying the solution to obtain fragrance-retaining microcapsules.

6. The preparation method according to claim 5, characterized in that: The weight portion of the core-shell structured γ-cyclodextrin-based dendrimer added is 5 parts, the weight portion of deionized water is 20-500 parts, the homogenization efficiency is 5000-20000 rpm, and the homogenization time is 1-10 minutes.

7. The preparation method according to claim 5, characterized in that: The weight proportion of the surfactant is 5-30 parts, the weight proportion of deionized water is 5-30 parts, and the weight proportion of the essence is 1-15 parts.

8. The preparation method according to claim 5, characterized in that: In S3, the stirring conditions are 200-1000 rpm, the stirring temperature is 40°C-90°C, the stirring time is 3-20h, and the ratio of the solution of S1 to the solution of S2 is 1:

1.

9. The preparation method according to claim 5, characterized in that: The surfactant is at least one of sodium lauryl sulfate, Tween 80 and Tween 20; the flavor is an oil-soluble flavor.

10. The preparation method according to claim 9, characterized in that: The essence is at least one of lavender essence, gardenia essence, rosemary essence, bluebell essence and eugenol essence.

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