Silicon-based polyurethane essence microcapsule and preparation method thereof

Abstract

The invention relates to a silicon-based polyurethane essence microcapsule and a preparation method thereof, and belongs to the technical field of microcapsules. The preparation method comprises the following steps: S1, uniformly stirring oil-soluble essence, a silicon-based mesoporous material and a diisocyanate compound to obtain an oil phase; s2, adding a polyol compound into the emulsifier solution, and uniformly stirring to obtain a water phase; s3, adding the oil phase into the water phase, homogenizing, heating and stirring to obtain the silicon-based polyurethane essence microcapsule. By introducing a silicon-based mesoporous material, a synergistic wrapping system of the essence microcapsule is constructed. According to the method, physical dispersion and chemical cross-linking embedding are combined, double-layer protection on volatile oil-soluble essence is achieved, the fragrance retention time of the oil-soluble essence is prolonged, meanwhile, the cost is controlled, in addition, the embedding particle size of the silicon-based polyurethane essence microcapsule can be rapidly and conveniently adjusted, and the embedding effect of the silicon-based polyurethane essence microcapsule is improved. And the application of the silicon-based polyurethane essence microcapsule in actual production is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of microcapsule technology, and particularly relates to a silicon-based polyurethane fragrance microcapsule and a preparation method thereof. Background Art

[0002] Microcapsule technology is a micro-packaging technology that uses various natural or synthetic polymer compounds to form continuous thin films (wall materials) to encapsulate a target substance (core material) into tiny particles, which can play the functions of transforming the morphology of the core material, protecting the core material, and controlling the release of the core material through certain external stimuli or sustained-release effects. Fragrances contain a variety of volatile and chemically unstable substances. By preparing fragrance microcapsules through microcapsule technology, the rapid volatilization of aroma components can be effectively prevented, and the fragrance retention time can be extended, so it is widely used in health products, textiles, food and other fields.

[0003] At present, the methods and systems for preparing microcapsules have been gradually improved, and microcapsule products synthesized by in-situ polymerization and interfacial polymerization have been commercialized. Such microcapsules mostly use polyurea and polyurethane materials as wall materials. However, a single microcapsule preparation method often has limitations. For example, polyurethane is prone to react with surfactants in the system, which has limitations in practical applications. Mesoporous materials refer to nanomaterials with pore diameters between 2 nm and 50 nm. Because of their large surface area, uniform pore size, clear pores, and easy functionalization, they have been widely studied. Compared with organic materials, the high loading capacity, high specific surface area, and easy surface modification of inorganic silicon-based mesoporous materials make them more capable of stimulating the modification of responsive groups, polymers, or proteins to achieve the controlled release and targeted delivery of the target substance.

[0004] Chinese Patent CN 116019962A discloses a preparation method of antibacterial microcapsules. In the preparation process of the microcapsules, part of the core material is composed of a mixture of Artemisia argyi essential oil and mesoporous silica, and then the microcapsules are prepared with chitosan as the wall material. Introducing mesoporous silica can form a multiple sustained-release structure, which helps the long-term sustained release of Artemisia argyi essential oil. However, glutaraldehyde needs to be used for cross-linking and curing in the preparation process of the microcapsules, and glutaraldehyde has certain irritation to the human body. Chinese Patent CN118512992A discloses a microcapsule with mesoporous silica as the wall material. The microcapsule can slowly release fragrance, and the wall material has high mechanical strength and solvent resistance, which can effectively protect the fragrance. However, the cost of preparing microcapsules with mesoporous silica as the wall material is high, and the process of optimizing the molecular structure and pore structure of silica to achieve the controlled release of microcapsules is complex.

[0005] Therefore, on the basis of silicon-based mesoporous materials, it is of great significance to develop a fragrance-type polyurethane microcapsule, but there are great challenges. Summary of the Invention

[0006] To this end, the technical problem to be solved by the present invention is to overcome the problems in the prior art that the polyurethane used as the wall material of the microcapsule has insufficient strength, low application stability, and limited application systems; using only the silicon-based mesoporous material as the wall material of the microcapsule has a relatively high cost and cannot adjust the embedding particle size of the microcapsule according to application requirements.

[0007] To solve the above technical problems, the present invention provides a silicon-based polyurethane fragrance microcapsule and a preparation method thereof. The silicon-based mesoporous material and polyurethane are compounded as the wall material of the silicon-based polyurethane fragrance microcapsule, which can protect the oil-soluble fragrance from the external environment to a certain extent and extend the release time of the oil-soluble fragrance; in addition, by adjusting the type or structure of the wall material, the timed release or stimulus-responsive release of the oil-soluble fragrance can also be achieved; moreover, not only the cost is reduced, but also the embedding particle size of the silicon-based polyurethane fragrance microcapsule can be adjusted according to requirements.

[0008] The first object of the present invention is to provide a preparation method of a silicon-based polyurethane fragrance microcapsule, comprising the following steps:

[0009] S1. Stir the oil-soluble fragrance, the silicon-based mesoporous material, and the diisocyanate compound evenly to obtain an oil phase;

[0010] S2. Add the polyol compound to the emulsifier solution and stir evenly to obtain an aqueous phase;

[0011] S3. Add the oil phase described in S1 to the aqueous phase described in S2, and after homogenization and heating and stirring, obtain the silicon-based polyurethane fragrance microcapsule.

[0012] In an embodiment of the present invention, in S1, the oil-soluble fragrance is orange oil fragrance;

[0013] The silicon-based mesoporous material is mesoporous silica;

[0014] The diisocyanate compound is selected from one or more of isophthaloyl diisocyanate, phenylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

[0015] In an embodiment of the present invention, in S1, the mass ratio of the oil-soluble fragrance to the silicon-based mesoporous material is (10 - 40):1, for example, it can be 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, 21:1, 22:1, 23:1, 24:1, 25:1, 26:1, 27:1, 28:1, 29:1, 30:1, 30:1, 31:1, 32:1, 33:1, 34:1, 35:1, 36:1, 37:1, 38:1, 39:1, 40:1, etc.;

[0016] The mass ratio of the oil-soluble essence to the diisocyanate compound is 4:(1-2), and for example, it can be 4:1, 4:1.1, 4:1.2, 4:1.3, 4:1.4, 4:1.5, 4:1.6, 4:1.7, 4:1.8, 4:1.9, 4:2, etc.

[0017] In an embodiment of the present invention, in S1, the rotation speed of the stirring is 300 rpm - 500 rpm, and for example, it can be 300 rpm, 310 rpm, 320 rpm, 330 rpm, 340 rpm, 350 rpm, 360 rpm, 370 rpm, 380 rpm, 390 rpm, 400 rpm, 410 rpm, 420 rpm, 430 rpm, 440 rpm, 450 rpm, 460 rpm, 470 rpm, 480 rpm, 490 rpm, 500 rpm, etc.; the time is 20 min - 30 min, and for example, it can be 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, 26 min, 27 min, 28 min, 29 min, 30 min, etc.

[0018] In an embodiment of the present invention, in S2, the emulsifier is selected from one or more of gum arabic, sodium dodecyl sulfate, sodium alginate, and polyvinyl alcohol;

[0019] The concentration of the emulsifier solution is 5 wt% - 10 wt%, and for example, it can be 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, etc.

[0020] In an embodiment of the present invention, in S2, the polyol compound is selected from one or more of glycerol, xylitol, sorbitol, and polyethylene glycol.

[0021] In an embodiment of the present invention, in S2, the rotation speed of the stirring is 300 rpm - 500 rpm, and for example, it can be 300 rpm, 310 rpm, 320 rpm, 330 rpm, 340 rpm, 350 rpm, 360 rpm, 370 rpm, 380 rpm, 390 rpm, 400 rpm, 410 rpm, 420 rpm, 430 rpm, 440 rpm, 450 rpm, 460 rpm, 470 rpm, 480 rpm, 490 rpm, 500 rpm, etc.; the time is 20 min - 30 min, and for example, it can be 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, 26 min, 27 min, 28 min, 29 min, 30 min, etc.

[0022] In one embodiment of the present invention, in S3, the mass ratio of the emulsifier solution to the oil-soluble flavor is (1 - 2):1, and for example, it can be 1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, etc.;

[0023] The mass ratio of the polyol compound to the diisocyanate compound is 1:(2 - 4), and for example, it can be 1:2, 1:2.1, 1:2.2, 1:2.3, 1:2.4, 1:2.5, 1:2.6, 1:2.7, 1:2.8, 1:2.9, 1:3, 1:3.1, 1:3.2, 1:3.3, 1:3.4, 1:3.5, 1:3.6, 1:3.7, 1:3.8, 1:3.9, 1:4, etc.

[0024] In one embodiment of the present invention, in S3, the rotation speed of the homogenization is 4000 rpm - 10000 rpm, and for example, it can be 4000 rpm, 4500 rpm, 5000 rpm, 5500 rpm, 6000 rpm, 6500 rpm, 7000 rpm, 7500 rpm, 8000 rpm, 8500 rpm, 9000 rpm, 9500 rpm, 10000 rpm, etc.; the time is 3 min - 10 min, and for example, it can be 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, etc.; through the shearing action during the homogenization process, the liquid (aqueous phase or oil phase) is broken into small droplets, so that the oil phase is uniformly dispersed in the aqueous phase, forming a tiny water-oil interface, and then the multifunctional monomers dispersed in the two phases undergo chemical reactions on the interface to generate microcapsules; by adjusting the homogenization rotation speed, the magnitude of the shearing action can be changed, and the liquid can be broken into droplets of different sizes, and finally microcapsules of different particle sizes are generated;

[0025] The temperature of the heating and stirring is 50°C - 80°C, for example, it can be 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C, 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, 80°C, etc.; the rotation speed is 300 rpm - 500 rpm, for example, it can be 300 rpm, 310 rpm, 320 rpm, 330 rpm, 340 rpm, 350 rpm, 360 rpm, 370 rpm, 380 rpm, 390 rpm, 400 rpm, 410 rpm, 420 rpm, 430 rpm, 440 rpm, 450 rpm, 460 rpm, 470 rpm, 480 rpm, 490 rpm, 500 rpm, etc.; the time is 3 h - 4 h, for example, it can be 3 h, 3.1 h, 3.2 h, 3.3 h, 3.4 h, 3.5 h, 3.6 h, 3.7 h, 3.8 h, 3.9 h, 4 h, etc.

[0026] In one embodiment of the present invention, a silicon-based polyurethane flavor microcapsule is prepared by an interfacial polymerization method. The main principle is to dissolve two polyfunctional monomers with different activities into two immiscible solvents respectively. When the two different solvents containing monomers come into contact with each other, these two monomers will undergo a chemical reaction at the interface of the two immiscible phases, forming a polymer film (wall material) to embed the oil-soluble flavor (core material), thereby forming a silicon-based polyurethane flavor microcapsule.

[0027] The second object of the present invention is to provide a silicon-based polyurethane flavor microcapsule prepared by the described preparation method.

[0028] The technical solution of the present invention has the following advantages compared with the prior art:

[0029] (1) In the process of preparing the flavor microcapsule with polyurethane as the wall material in the present invention, a silicon-based mesoporous material is introduced to construct a synergistic encapsulation system for the flavor microcapsule. By combining physical dispersion and chemical cross-linking embedding, double protection is achieved for the volatile oil-soluble flavor, while controlling the cost while extending the fragrance retention time of the oil-soluble flavor. In addition, this method can quickly and conveniently adjust the embedding particle size of the silicon-based polyurethane flavor microcapsule, which is beneficial to the application of the silicon-based polyurethane flavor microcapsule in actual production.

[0030] (2) In the preparation method of the present invention, an appropriate amount of silicon-based mesoporous material is introduced during the preparation of polyurethane microcapsules by interfacial polymerization. A multiple sustained-release structure is constructed through the combination of physical dispersion and chemical cross-linking, which can extend the fragrance retention time of oil-soluble fragrances while ensuring the strength and cost of the microcapsules. In addition, by changing the reaction conditions during the synthesis of polyurethane, the embedding particle size of the silicon-based polyurethane fragrance microcapsules can be quickly adjusted, effectively making up for the deficiency that it is difficult to adjust the particle size of the silicon-based mesoporous material. Description of the Drawings

[0031] In order to make the content of the present invention easier to be clearly understood, the following further describes the present invention in detail according to specific embodiments of the present invention and in conjunction with the drawings, where:

[0032] Figure 1 It is the scanning electron microscope image of the silicon-based polyurethane fragrance microcapsule of Example 1 of the present invention;

[0033] Figure 2 It is the scanning electron microscope image of the silicon-based polyurethane fragrance microcapsule of Example 4 of the present invention;

[0034] Figure 3 It is the scanning electron microscope image of the polyurethane fragrance microcapsule of Comparative Example 1 of the present invention;

[0035] Figure 4 It is the diameter distribution diagram of the silicon-based polyurethane fragrance microcapsule of Example 1 of the present invention;

[0036] Figure 5 It is the diameter distribution diagram of the silicon-based polyurethane fragrance microcapsule of Example 4 of the present invention. Detailed Embodiments

[0037] The following further describes the present invention in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. It should be understood that the specific embodiments are only used to explain the present invention, but the exemplified embodiments do not limit the present invention.

[0038] In the present invention, unless otherwise specified, the technical and scientific terms used in the present invention have the same meanings as those generally understood by those skilled in the technical field to which the present invention belongs.

[0039] In the present invention, unless otherwise specified, the term "and / or" includes any and all combinations of one or more of the related listed items.

[0040] In the present invention, unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods without special instructions. The materials, reagents, etc. used can be obtained from commercial channels without special instructions.

[0041] In the present invention, unless otherwise specified, the oil-soluble essence used in the embodiments of the present invention is purchased from Zhejiang Haida Biotechnology Co., Ltd., and the model is orange oil essence.

[0042] In the present invention, unless otherwise specified, the silicon-based mesoporous material used in the embodiments of the present invention is mesoporous silica, purchased from Jiangsu Xianfeng Nano Materials Technology Co., Ltd., with the model XFF11, an average particle size of about 80 nm, a pore volume of about 1.4 mL / g, and a pore diameter of about 2.9 nm.

[0043] In the present invention, unless otherwise specified, the particle size of the silicon-based polyurethane essence microcapsules in the embodiments of the present invention is detected by a particle size analyzer.

[0044] Example 1

[0045] The silicon-based polyurethane essence microcapsules of this example and their preparation method specifically include the following steps:

[0046] S1. Preparation of the oil phase: Weigh the oil-soluble essence and the silicon-based mesoporous material according to a mass ratio of 40:1, and stir at 500 rpm for 30 min at room temperature until fully mixed; then add the diisocyanate compound isophorone diisocyanate (the mass ratio of the oil-soluble essence to the diisocyanate compound is 4:1), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the oil phase.

[0047] S2. Preparation of the water phase: Add deionized water to the emulsifier polyvinyl alcohol powder, and then dissolve it in a 90 °C water bath until fully dissolved to prepare an emulsifier solution with a concentration of 10 wt% (the mass ratio of the emulsifier solution to the oil-soluble essence is 1:1); then add the polyol compound polyethylene glycol (the mass ratio of the polyol compound to the diisocyanate compound is 1:2), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the water phase.

[0048] S3. Preparation of the emulsion: Add the oil phase to the water phase, and homogenize at a high speed of 10000 rpm for 10 min to obtain the emulsion.

[0049] S4. Preparation of the silicon-based polyurethane essence microcapsules: Place the emulsion on a water bath magnetic stirring device and stir at 500 rpm for 3 h at 50 °C to obtain the silicon-based polyurethane essence microcapsules.

[0050] Example 2

[0051] The silicon-based polyurethane fragrance microcapsules of this embodiment and its preparation method specifically include the following steps:

[0052] S1. Preparation of the oil phase: Weigh the oil-soluble fragrance and the silicon-based mesoporous material according to a mass ratio of 20:1, and stir at 500 rpm for 30 min at room temperature until fully mixed; then add the diisocyanate compound hexamethylene diisocyanate (the mass ratio of the oil-soluble fragrance to the diisocyanate compound is 4:1), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the oil phase.

[0053] S2. Preparation of the water phase: Add deionized water to the emulsifier sodium alginate powder, and then heat in a water bath until fully dissolved to prepare an emulsifier solution with a concentration of 10 wt% (the mass ratio of the emulsifier solution to the oil-soluble fragrance is 1:1); then add the polyol compound xylitol (the mass ratio of the polyol compound to the diisocyanate compound is 1:2), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the water phase.

[0054] S3. Preparation of the emulsion: Add the oil phase to the water phase and homogenize at a high speed of 10000 rpm for 10 min to obtain the emulsion.

[0055] S4. Preparation of the silicon-based polyurethane fragrance microcapsules: Place the emulsion on a water bath magnetic stirring device and stir at 500 rpm for 3 h at 50 °C to obtain the silicon-based polyurethane fragrance microcapsules.

[0056] Example 3

[0057] The silicon-based polyurethane fragrance microcapsules of this embodiment and its preparation method specifically include the following steps:

[0058] S1. Preparation of the oil phase: Weigh the oil-soluble fragrance and the silicon-based mesoporous material according to a mass ratio of 40:1, and stir at 500 rpm for 30 min at room temperature until fully mixed; then add the diisocyanate compound phenyl diisocyanate (the mass ratio of the oil-soluble fragrance to the diisocyanate compound is 4:1), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the oil phase.

[0059] S2. Preparation of the water phase: Add deionized water to the emulsifier gum arabic powder, and then heat in a water bath until fully dissolved to prepare an emulsifier solution with a concentration of 10 wt% (the mass ratio of the emulsifier solution to the oil-soluble fragrance is 1:1); then add the polyol compound glycerol (the mass ratio of the polyol compound to the diisocyanate compound is 1:2), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the water phase.

[0060] S3. Preparation of the emulsion: Add the oil phase to the water phase and homogenize at a high speed of 10000 rpm for 10 min to obtain the emulsion.

[0061] S4. Preparation of silicon-based polyurethane flavor microcapsules: Place the emulsion on a water bath magnetic stirring device and stir at 500 rpm for 3 h at 50 °C to obtain silicon-based polyurethane flavor microcapsules.

[0062] Example 4

[0063] The silicon-based polyurethane flavor microcapsules of this example and its preparation method specifically include the following steps:

[0064] S1. Preparation of the oil phase: Weigh the oil-soluble flavor and the silicon-based mesoporous material according to a mass ratio of 40:1, and stir at 500 rpm for 30 min at room temperature until fully mixed; then add the diisocyanate compound isophorone diisocyanate (the mass ratio of the oil-soluble flavor to the diisocyanate compound is 4:1), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the oil phase.

[0065] S2. Preparation of the water phase: Add deionized water to the emulsifier polyvinyl alcohol powder, and then dissolve it in a 90 °C water bath until fully dissolved to prepare an emulsifier solution with a concentration of 10 wt% (the mass ratio of the emulsifier solution to the oil-soluble flavor is 1:1); then add the polyol compound polyethylene glycol (the mass ratio of the polyol compound to the diisocyanate compound is 1:2), and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the water phase.

[0066] S3. Preparation of the emulsion: Add the oil phase to the water phase and homogenize at 4000 rpm for 10 min to obtain the emulsion.

[0067] S4. Preparation of silicon-based polyurethane flavor microcapsules: Place the emulsion on a water bath magnetic stirring device and stir at 500 rpm for 3 h at 50 °C to obtain silicon-based polyurethane flavor microcapsules.

[0068] Comparative Example 1

[0069] Basically the same as Example 1, the difference is that the silicon-based mesoporous material is not added, and it specifically includes the following steps:

[0070] S1. Preparation of the oil phase: Weigh the oil-soluble flavor and the diisocyanate compound isophorone diisocyanate according to a mass ratio of 4:1, and stir at 500 rpm for 20 min at room temperature until fully mixed to obtain the oil phase.

[0071] S2. Preparation of the aqueous phase: Deionized water was added to the emulsifier polyvinyl alcohol powder, and then it was placed in a water bath at 90 °C until it was completely dissolved to prepare an emulsifier solution with a concentration of 10 wt% (the mass ratio of the emulsifier solution to the oil-soluble essence was 1:1); then the polyol compound polyethylene glycol was added (the mass ratio of the polyol compound to the diisocyanate compound was 1:2), and it was stirred at 500 rpm for 20 min at room temperature until it was fully mixed to obtain the aqueous phase.

[0072] S3. Preparation of the emulsion: The oil phase was added to the aqueous phase and homogenized at a high speed of 10000 rpm for 10 min to obtain the emulsion.

[0073] S4. Preparation of the silicon-based polyurethane essence microcapsules: The emulsion was placed on a magnetic stirring device in a water bath and stirred at 500 rpm for 3 h at 50 °C to obtain the polyurethane essence microcapsules.

[0074] Test Example 1

[0075] The polyurethane essence microcapsules of Example 1, Example 4 and Comparative Example 1 were characterized by SEM, and the results are as Figures 1-3 shown.

[0076] From Figure 1 , Figure 2 it can be seen that after reducing the homogenization speed, silicon-based polyurethane essence microcapsules with a larger embedding particle size can be prepared.

[0077] From Figure 1 , Figure 3 it can be seen that the morphology of the polyurethane essence microcapsules prepared without adding the silicon-based mesoporous material is not smooth, and some of the polyurethane essence microcapsules are broken, indicating that the strength of the microcapsules prepared with polyurethane as the single wall material is poor, far inferior to that of the polyurethane essence microcapsules prepared with the silicon-based mesoporous material.

[0078] Test Example 2

[0079] The diameters of the silicon-based polyurethane essence microcapsules of Example 1 and Example 4 were measured, and the results are as Figures 4-5 shown. From Figures 4-5 it can be seen that after reducing the homogenization speed, silicon-based polyurethane essence microcapsules with a larger embedding particle size can be prepared, and the particle size of the silicon-based polyurethane essence microcapsules is increased from 2 μm - 3 μm to 7.5 μm - 12.5 μm. It shows that the scheme of this application can adjust the embedding particle size of the silicon-based polyurethane essence microcapsules according to needs, which is beneficial to the practical application of the silicon-based polyurethane essence microcapsules.

[0080] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A method for preparing silicon-based polyurethane flavor microcapsules, characterized in that: The following steps are involved: S1. Evenly stir the oil-soluble flavor, the silicon-based mesoporous material and the diisocyanate compound to obtain an oil phase; S2, adding a polyol compound to the emulsifier solution and stirring evenly to obtain an aqueous phase; S3, adding the oil phase described in S1 to the water phase described in S2, homogenizing, heating and stirring, to obtain the silicon-based polyurethane flavor microcapsules.

2. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S1, the oil-soluble flavor is orange oil flavor; The silicon-based mesoporous material is mesoporous silica; The diisocyanate compound is selected from one or more of benzyl diisocyanate, phenylene diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

3. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S1, the mass ratio of the oil-soluble flavor to the silicon-based mesoporous material is (10-40):1; The mass ratio of the oil-soluble flavor to the diisocyanate compound is 4:(1-2).

4. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S1, the stirring speed is 300 rpm-500 rpm, and the time is 20 min-30 min.

5. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S2, the emulsifier is selected from one or more of gum arabic, sodium lauryl sulfate, sodium alginate and polyvinyl alcohol; The concentration of the emulsifier solution is 5wt%-10wt%.

6. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S2, the polyol compound is selected from one or more of glycerol, xylitol, sorbitol and polyethylene glycol.

7. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S2, the stirring speed is 300 rpm-500 rpm, and the time is 20 min-30 min.

8. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S3, the mass ratio of the emulsifier solution to the oil-soluble flavor is (1-2):1; The mass ratio of the polyol compound to the diisocyanate compound is 1:(2-4).

9. The method for preparing silicon-based polyurethane flavor microcapsules according to claim 1, characterized in that: In S3, the homogenization speed is 4000 rpm-10000 rpm, and the time is 3 min-10 min; The heating and stirring is performed at a temperature of 50° C.-80° C., a rotation speed of 300 rpm-500 rpm, and a time of 3 h-4 h.

10. Silicon-based polyurethane flavor microcapsules prepared by the preparation method according to any one of claims 1 to 9.

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