Double-layer coated microcapsule perfume as well as preparation method and application thereof

Abstract

The invention relates to the field of microcapsule spices, and discloses a double-layer coated microcapsule spice as well as a preparation method and application thereof. The double-layer coated microcapsule perfume is composed of an oil-soluble capsule core perfume, an inner coating layer and an outer coating layer, wherein the inner coating layer is prepared from the following raw materials in percentage by weight: 6-10% of hydroxypropyl-beta-cyclodextrin, 3-5% of glycerol / inulin lauryl carbamate, 1.2-1.8% of hydroxyethyl chitosan, 2-4% of a dispersing agent and the balance of water; the outer coating layer is prepared from the following raw materials in percentage by weight: 20 to 30 percent of organic silicon modified polyurethane emulsion, 4.5 to 6.5 percent of polymethyl vinyl ether copolymerized maleic acid, 0.5 to 1.5 percent of PH (Potential of Hydrogen) regulator and the balance of water. The microcapsule perfume prepared by the invention is applied to the textile fabric and has better adhesion performance and washing resistance, and the textile fabric is good in softness and obvious and lasting in fragrance.

Description

Technical Field

[0001] This application relates to the field of microencapsulated flavorings, and more specifically, to a double-layered microencapsulated flavoring, its preparation method, and its application. Background Technology

[0002] As consumers increasingly demand both functionality and comfort in textiles, microencapsulated fragrance technology has gradually become a research hotspot in the textile industry due to its ability to achieve slow-release and long-lasting fragrance. By encapsulating fragrances in microcapsules, the evaporation rate of the fragrance can be effectively slowed down, and the fragrance can be released in a controlled manner under external stimuli such as friction, heating, or washing, thus giving the fabric a long-lasting fragrance. Fragrances with skin-care or calming and sleep-aiding functions can also be selected, such as sandalwood, lavender, and rose. These functional microencapsulated fragrances are widely used in high-end apparel, home textiles, and functional textiles.

[0003] Currently in the textile industry, microcapsule fragrances generally employ an encapsulation structure, with shell materials such as acrylates, polyurethanes, polyureas, or natural polymers encapsulating the fragrance. The fabric yarns carry a negative charge, while the microcapsule fragrances carry a positive charge. Through electrostatic adsorption, the microcapsule fragrances adhere to the fabric surface, giving the fabric a fragrance.

[0004] However, when this microcapsule fragrance is applied to fabrics, it can easily make the fabric stiff and has low adhesion to the fabric, resulting in a low fragrance concentration. Furthermore, after long-term washing and wearing, the fragrance will continue to decrease, leaving very little fragrance on the fabric, making it difficult to meet the requirement of long-lasting fragrance. Summary of the Invention

[0005] To address the problems that existing microcapsule fragrances applied to fabrics tend to cause the fabric to stiffen, have a low fragrance concentration on the fabric surface, and exhibit poor fragrance retention after long-term washing and wearing, this application provides a double-layer encapsulated microcapsule fragrance, its preparation method, and its application.

[0006] In a first aspect, this application provides a double-layer-coated microcapsule fragrance, employing the following technical solution: A double-layered microcapsule fragrance comprises an oil-soluble core fragrance, an inner coating layer, and an outer coating layer, wherein the inner coating layer is prepared from the following raw materials in weight percentages: Hydroxypropyl-β-cyclodextrin 6-10% Glycerin / Inulin Lauryl Carbamate 3-5% Hydroxyethyl chitosan 1.2-1.8% Dispersant 2-4% Water balance; The outer coating layer is made from the following raw materials by weight percentage: 20-30% silicone-modified polyurethane emulsion Polymethyl vinyl ether copolymer of maleic acid 4.5-6.5% pH adjuster 1-3% Water balance.

[0007] By adopting the above technical solution, the double-layer encapsulated fragrance consists of an oil-soluble core fragrance, an inner encapsulation layer, and an outer encapsulation layer. In the inner encapsulation layer, hydroxypropyl-β-cyclodextrin exhibits excellent inclusion properties, stably encapsulating the oil-soluble core fragrance and reducing leakage and volatilization. Glycerin / inulin lauryl carbamate helps improve the softness and stability of the inner encapsulation layer. Hydroxyethyl chitosan enhances the affinity between the inner encapsulation layer and the oil-soluble core fragrance, improving the encapsulation effect. The dispersant ensures uniform dispersion of the raw materials. Hydroxypropyl-β-cyclodextrin, glycerin / inulin lauryl carbamate, hydroxyethyl chitosan, and the dispersant synergistically work in water to stably encapsulate the oil-soluble core fragrance. The silicone-modified polyurethane emulsion possesses good film-forming properties and water resistance. Polymethyl vinyl ether copolymer maleic acid can adjust the performance of the outer encapsulation layer. The pH adjuster can regulate the acidity and alkalinity of the system, ensuring the stability of the outer encapsulation layer. Organosilicon-modified polyurethane emulsion, polymethyl vinyl ether copolymer maleic acid, and pH adjuster work together in water to form an outer coating layer that stably bonds with the inner coating layer, further enhancing the encapsulation stability of oil-soluble core fragrances. This coating softens upon contact with water, making it less prone to breakage and allowing for better adhesion to textile fabrics. As a result, when microcapsule fragrances are applied to textile fabrics, they not only exhibit good adhesion but also excellent wash resistance and softness, ensuring a noticeable and long-lasting fragrance.

[0008] Preferably, the dispersant is composed of diethylene glycol and 4-hydroxybutyl vinyl ether in a weight ratio of 1:(0.2-0.5).

[0009] By adopting the above technical solution, using diethylene glycol and 4-hydroxybutylvinyl ether as dispersants in the inner coating layer, raw materials such as hydroxypropyl-β-cyclodextrin, glycerol / inulin lauryl carbamate, and hydroxyethyl chitosan can be better and more uniformly dispersed in water, which helps to form a stable inner coating layer. This ensures the structural stability and performance of the double-layer encapsulated microcapsule fragrance, while also improving the bonding stability between the inner and outer coating layers, thereby enhancing the fragrance persistence and softness of textile fabrics.

[0010] Preferably, the oil-soluble core fragrance is any one of sandalwood, lavender, rose, artemisia, and jasmine.

[0011] By adopting the above technical solution and using specific oil-soluble core fragrances such as sandalwood, lavender, rose, artemisia, and jasmine, textile fabrics can be effectively given a lasting fragrance. These fragrances also have functions such as skin care or calming and sleep aiding, with good functional effects.

[0012] Preferably, the pH adjuster is any one of triethanolamine, diethanolamine, and isopropanolamine.

[0013] By adopting the above technical solution and selecting any one of triethanolamine, diethanolamine, or isopropanolamine as a pH adjuster, the pH value of the outer coating layer preparation system can be adjusted to maintain a stable acid-base environment. This is beneficial for the full synergy between the organosilicon-modified polyurethane emulsion and the polymethyl vinyl ether copolymer maleic acid, thereby improving the overall performance of the double-layer coated microcapsule fragrance. This results in better adhesion and washability when applied to textile fabrics, making the fragrance of the textile fabric more pronounced and longer-lasting.

[0014] Preferably, the diameter of the capsule wall of the double-layered encapsulated fragrance is 15-25 μm.

[0015] By adopting the above technical solution, the double-layered microcapsules with a better capsule wall diameter can increase the encapsulation amount of oil-soluble core fragrance, can stably adhere to the surface of textile fabrics, are not easy to fall off, can slowly release fragrance, improve the fragrance persistence of textile fabrics, and can maintain a good fragrance concentration for a long time.

[0016] Secondly, this application provides a method for preparing a double-layer-coated microcapsule fragrance, using the following technical solution: A method for preparing a double-layer-coated microcapsule fragrance includes the following steps: S1. Hydroxypropyl-β-cyclodextrin and hydroxyethyl chitosan were added to a portion of water to prepare mixture I; S2. Add glycerol / inulin lauryl carbamate and dispersant to the remaining water, stir and disperse, then add oil-soluble capsule flavoring, continue stirring and dispersing to obtain mixture II; S3. Add mixture II to mixture I, heat and stir to form an inner coating layer, and obtain a single-layer coated emulsion; S4. Add the silicone-modified polyurethane emulsion, polymethyl vinyl ether copolymer maleic acid pH adjuster and water to the reaction equipment, heat and stir to obtain mixture III; S5. Add mixture III to the single-layer coated emulsion, heat and stir to form an outer coating layer, and obtain a double-layer coated microcapsule fragrance.

[0017] By adopting the above technical solution, in step S1, hydroxypropyl-β-cyclodextrin and hydroxyethyl chitosan are added to a portion of water to obtain mixture I, which allows hydroxypropyl-β-cyclodextrin and hydroxyethyl chitosan to be uniformly dispersed; in step S2, glycerol / inulin lauryl carbamate and dispersant are added to the remaining water, and then oil-soluble core fragrance is added and stirred to obtain mixture II. Glycerol / inulin lauryl carbamate and dispersant work synergistically to improve the dispersion uniformity of oil-soluble core fragrance, prevent the oil-soluble core fragrance from agglomerating, and improve the subsequent coating efficiency; in step S3, mixture II is added to mixture I and heated and stirred, and the system undergoes an inclusion reaction to form an inner coating layer, which stably coats the oil-soluble core fragrance to obtain a single-layer coated emulsion; in step S4, organosilicon-modified polyurethane emulsion and polymethyl vinyl are added... Mixture III is prepared by adding ether-copolymerized maleic acid, pH adjuster, and water to a reaction apparatus and heating and stirring. Under the action of pH adjuster, the organosilicon-modified polyurethane emulsion and polymethyl vinyl ether-copolymerized maleic acid are dispersed and interwoven to form a stable coating structure, which helps to enhance the film-forming properties and coating stability of the outer coating layer. In step S5, mixture III is added to a single-layer coating emulsion and heated and stirred to form an outer coating layer, thus obtaining a double-layer coated microcapsule fragrance. The double-layer coating structure further improves the stability of the microcapsule fragrance and the protection of the oil-soluble core fragrance. This allows the microcapsule fragrance to absorb water and adhere stably to the surface of the textile fabric when applied, releasing fragrance stably and persistently, without easily breaking or falling off. It has good adhesion, washability, and softness, and maintains a distinct fragrance for a long time.

[0018] Preferably, the weight of the oil-soluble core fragrance is 3.5-5.5% of the weight of the monolayer encapsulated emulsion.

[0019] By adopting the above technical solution and optimizing the amount of oil-soluble core fragrance and single-layer coating emulsion, the coating stability of oil-soluble coated fragrance can be improved while the coating rate of oil-soluble fragrance can be increased to a large extent.

[0020] Preferably, the heating temperature in step S3 is 60-80℃, the stirring rate is 800-1200 r / min, and the stirring time is 1.5-2.5 h.

[0021] By adopting the above technical solution, in step S3, the heating temperature is controlled at 60-80℃, the stirring rate is 800-1200r / min, and the stirring time is 1.5-2.5h. Such heating and stirring conditions can fully integrate and react mixture I and mixture II, which is conducive to the uniform coating of the inner coating layer on the oil-soluble core fragrance, forming a stable single-layer coating emulsion, ensuring the quality and performance of the inner coating layer, and thus improving the overall quality of the double-layer coated microcapsule fragrance.

[0022] Preferably, the heating temperature in step S5 is 50-60℃, the stirring rate is 400-800 r / min, and the stirring time is 1-2 h.

[0023] By adopting the above technical solution, in step S5, the heating temperature is controlled at 50-60℃. This temperature range ensures that the outer coating material, such as the silicone-modified polyurethane emulsion and polymethyl vinyl ether copolymer maleic acid, reacts fully to form a stable structure, while avoiding the loss of oil-soluble core fragrance due to high temperature. The stirring rate is controlled at 400-800 r / min, which enables the raw materials to be mixed evenly, which is beneficial for the outer coating layer to be evenly coated on the single-layer coating emulsion. The stirring time is 1-2 hours to ensure that the outer coating layer is formed completely and has good performance. When the double-layer coated microcapsule fragrance is applied to textile fabrics, it has better adhesion and washability, making the fragrance of the textile fabric obvious and long-lasting.

[0024] Thirdly, this application provides a method for preparing a double-layer coated microcapsule fragrance, and the application of the double-layer coated microcapsule fragrance obtained by the method is as follows: A method for preparing double-layered microcapsule fragrances reveals the application of these fragrances in textile fabrics.

[0025] By adopting the above technical solution, the double-layer encapsulated microcapsule fragrance is applied to textile fabrics. Because the oil-soluble core fragrance is double-layered, the fragrance volatilization rate can be effectively slowed down, the fragrance can be released in a controlled manner, and the fabric can be given a long-lasting fragrance. At the same time, the outer coating layer softens when it comes into contact with water, and the microcapsule fragrance can better adhere to the fabric, giving the fabric better adhesion, water resistance and softness, and a distinct and long-lasting fragrance.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The double-layer encapsulated fragrance of this application consists of an inner encapsulation layer and an outer encapsulation layer with a specific ratio of raw materials, encapsulating an oil-soluble core fragrance. The hydroxypropyl-β-cyclodextrin, glycerol / inulin lauryl carbamate, hydroxyethyl chitosan, dispersant and water in the inner encapsulation layer work synergistically, while the organosilicon-modified polyurethane emulsion, polymethyl vinyl ether copolymaleic acid, pH adjuster and water in the outer encapsulation layer also work synergistically. This makes the double-layer encapsulated fragrance have good adhesion and softness when applied to textile fabrics, and can improve the fragrance concentration and persistence of the fabric.

[0027] 2. The dispersants used are diethylene glycol and 4-hydroxybutylvinyl ether, which facilitates better dispersion of oil-soluble core fragrance in the inner coating layer, while improving the bonding stability of the inner and outer coating layers, making the structure of the double-layer coated microcapsule fragrance more uniform and stable, thereby improving its performance in textile fabrics.

[0028] 3. Through a specific preparation method, an inner coating layer is first formed to obtain a single-layer coated emulsion, and then an outer coating layer is formed to obtain a double-layer coated microcapsule fragrance. This method can precisely control the formation of the double-layer coating structure and ensure the performance of the microcapsule fragrance.

[0029] 4. The temperature and stirring conditions in step S3 (stirring at 60-80℃ and 800-1200r / min for 1.5-2.5h) and step S5 (stirring at 50-60℃ and 400-800r / min for 1-2h) are conducive to the full formation of the inner and outer coating layers, ensuring the quality and performance of the double-layer coated microcapsule fragrance. When applied to textile fabrics, it has good adhesion and washability, making the fabric fragrance obvious and long-lasting. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the embodiments.

[0031] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used: 1. Hydroxypropyl-β-cyclodextrin: CAS No. 128446-35-5, purity 98%; 2. Glycerin / Inulin Lauryl Carbamate: INUTEC SL1 (France); 3. Hydroxyethyl chitosan: CAS No. 123938-86-3, degree of substitution 85%; 4. Organosilicon-modified polyurethane emulsion: Evonik SILIKOPUR 8081; 5. Polymethyl vinyl ether copolymer maleic acid: CAS No. 25153-40-6, content 99%. Example

[0032] Example 1 Example 1 discloses a method for preparing a double-layer coated microcapsule fragrance, comprising the following steps: S1. Add 0.6 kg of hydroxypropyl-β-cyclodextrin and 0.18 kg of hydroxyethyl chitosan to 5 kg of water, stir to dissolve, and prepare mixture I; S2. Add 0.3 kg of glycerol / inulin lauryl carbamate and 0.4 kg of dispersant to 3.52 kg of water, stir and disperse, then add 0.35 kg of oil-soluble capsule flavoring, continue stirring and dispersing to obtain mixture II; S3. Add mixture II to mixture I, heat to 60°C, and stir for 2.5 hours at a stirring rate of 1200 r / min to form an inner coating layer on the surface of the oil-soluble core fragrance, thus obtaining a single-layer coated emulsion.

[0033] S4. Add 2 kg of silicone-modified polyurethane emulsion, 0.65 kg of polymethyl vinyl ether copolymer maleic acid, 0.3 kg of triethanolamine as a pH adjuster and 7.05 kg of water to the reactor, heat to 60°C, stir for 2 h to obtain mixture III. S5. Add mixture III to the monolayer coated emulsion and heat to 50°C. Stir for 2 hours at a stirring rate of 800 r / min to form an outer coating layer on the surface of the inner coating layer, thus obtaining a double-layer coated microcapsule fragrance. The capsule wall diameter of the double-layer coated microcapsule fragrance is distributed in the range of 15-25 μm.

[0034] Example 2-3 The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0035] Table 1 Parameter table for Examples 1-3 Example 4 The difference between Example 4 and Example 1 is that the dispersant consists of diethylene glycol and 4-hydroxybutyl vinyl ether in a weight ratio of 1:0.2, while the rest is the same as in Example 1.

[0036] Example 5 The difference between Example 5 and Example 1 is that the dispersant consists of diethylene glycol and 4-hydroxybutyl vinyl ether in a weight ratio of 1:0.5, while the rest is the same as in Example 1.

[0037] Example 6 The difference between Example 6 and Example 1 is that the temperature in step S5 is 80°C, while the rest is the same as in Example 1.

[0038] Example 7 The difference between Example 7 and Example 1 lies in the preparation steps. The preparation method for Example 7 is as follows: S1. Add 0.6 kg of hydroxypropyl-β-cyclodextrin, 0.18 kg of hydroxyethyl chitosan, 0.3 kg of glycerol / inulin lauryl carbamate and 0.4 kg of dispersant to 8.52 kg of water, stir to dissolve, and prepare mixture I; S2. Add 0.35 kg of oil-soluble core fragrance to mixture I, heat to 60°C, and stir for 2.5 h at a stirring rate of 1200 r / min to form an inner coating layer on the surface of the oil-soluble core fragrance, thus obtaining a single-layer coated emulsion.

[0039] S3. Add 2 kg of silicone-modified polyurethane emulsion, 0.65 kg of polymethyl vinyl ether copolymer maleic acid, 0.3 kg of triethanolamine as a pH adjuster and 7.05 kg of water to the reactor, heat to 60°C, stir for 2 h to obtain mixture II; S4. Add mixture II to the single-layer coated emulsion and heat to 50°C. Stir for 2 hours at a stirring rate of 800 r / min to form an outer coating layer on the surface of the inner coating layer, thus obtaining a double-layer coated microcapsule fragrance.

[0040] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the glycerol / inulin lauryl carbamate in step S2 is replaced with an equal amount of dispersant, while the rest is the same as in Example 1.

[0041] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that hydroxyethyl chitosan was replaced with an equal amount of carboxymethyl cellulose, while the rest is the same as Example 1.

[0042] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that an equal amount of polymethyl vinyl ether copolymer maleic acid was replaced with an organosilicon-modified polyurethane emulsion, while the rest was the same as in Example 1.

[0043] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the silicone-modified polyurethane emulsion was replaced with an equal amount of water-based polyurethane emulsion, while the rest was the same as in Example 1.

[0044] Application examples Application Example 1 The weight is 180g / m 2 The 40-count plain knitted pure cotton fabric was treated by soaking it in a 3wt% microcapsule fragrance solution prepared with the double-layer encapsulated fragrance obtained in Example 1. The soaking temperature was 40℃ and the soaking time was 30min. After draining, it was dried at 80℃ for 10min and then high-temperature set at 150℃ for 1min to obtain a fragrant textile fabric.

[0045] Application Example 2-11 The difference between Application Example 2-11 and Application Example 1 is that the source of the fragrance in the double-layered microcapsule is different, as detailed in Table 2 below.

[0046] Table 2. Source of flavoring in double-layered microcapsule application example 2-11 Performance testing The following tests were conducted on the textile fabrics prepared in accordance with test cases 1-11: 1. Softness test The bending stiffness (unit: mN·cm) of the textile fabric was tested according to the test method in GB / T 18318.1-2009 "Determination of bending properties of textiles". The smaller the bending stiffness, the better the softness of the textile fabric. The test results were tested and recorded.

[0047] 2. Fragrance scoring: Five testers (3 women and 2 men, aged 22-45) will conduct olfactory tests on the fabric and score its fragrance. The average value will be taken and rounded to one decimal place. The scoring criteria are as follows: obvious fragrance 9-10 points; moderate fragrance 8-9 points; faint fragrance 7-8 points; almost no fragrance 6-7 points. The test results will be recorded.

[0048] 3. Water washing test: The textile fabric was washed according to the test method in GB / T 8629—2017, using a type A washing machine and standard detergent. The fabric was washed 30 times per cycle and then air-dried. Five testers (3 women and 2 men, aged 22-45) conducted an olfactory test on the fabric, scoring its fragrance and taking the average value, rounded to one decimal place. The scoring criteria were as follows: noticeable fragrance 9-10 points; moderate fragrance 8-9 points; faint fragrance 7-8 points; virtually no fragrance 6-7 points. The test results were recorded.

[0049] The following are the performance test data of the textile fabrics used in Application Examples 1-11, as detailed in Table 3 below.

[0050] Table 3 Performance data for Application Example 1-11 Based on Application Examples 1-3, 4-5, and 8-9, and in conjunction with Table 3, it is concluded that using the hydroxypropyl-β-cyclodextrin, glycerol / inulin lauryl carbamate, and dispersant of this application to prepare the inner coating layer, the resulting double-layered microcapsule fragrance, when applied to textile fabrics, significantly improves the fragrance concentration and fragrance persistence, while slightly reducing the bending strength. In Application Example 8, glycerol / inulin lauryl carbamate was replaced with an equal amount of dispersant; in Application Example 9, hydroxyethyl chitosan was replaced with an equal amount of carboxymethyl cellulose. The resulting textile fabrics showed a decrease in initial fragrance concentration and fragrance persistence, and a significant increase in bending strength. This may be because the synergistic effect of the components in the inner coating layer was reduced, thereby decreasing the bonding stability between the inner and outer coating layers, resulting in reduced softness and adhesion of the double-layered microcapsule fragrance.

[0051] Based on Application Examples 1 and 6-7 and Table 3, it can be concluded that by optimizing the preparation method steps and parameters of this application, the adhesion and softness of the prepared double-layer coated microcapsule fragrance on the fabric surface can be improved. In Application Example 6, the coating temperature of the outer coating layer was increased, and in Application Example 7, the coating steps of the inner coating layer were changed. The fragrance concentration and persistence of the prepared textile fabric were reduced, and the softness of the fabric was also reduced.

[0052] Combining Application Examples 1 and 10-11 with Table 3, it is concluded that using the silicone-modified polyurethane emulsion and polymethyl vinyl ether copolymerized maleic acid to prepare the outer coating layer, the resulting double-layered encapsulated fragrance, when applied to textile fabrics, exhibits good fragrance concentration and longevity, while also significantly improving the softness of the fabric. In Application Example 10, only the silicone-modified polyurethane emulsion was used; in Application Example 11, the silicone-modified polyurethane emulsion was replaced with an aqueous polyurethane emulsion, resulting in a decrease in the softness, fragrance concentration, and fragrance longevity of the prepared textile fabric.

[0053] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A double-layered microcapsule fragrance, characterized in that, It consists of an oil-soluble core fragrance, an inner coating layer, and an outer coating layer, wherein the inner coating layer is made from the following raw materials in weight percentages: Hydroxypropyl-β-cyclodextrin 6-10% Glycerin / Inulin Lauryl Carbamate 3-5% Hydroxyethyl chitosan 1.2-1.8% Dispersant 2-4% Water balance; The outer coating layer is made from the following raw materials by weight percentage: Organosilicon-modified polyurethane emulsion 20-30% Polymethyl vinyl ether copolymer of maleic acid 4.5-6.5% pH adjuster 1-3% Water balance.

2. The double-layer coated microcapsule fragrance according to claim 1, characterized in that, The dispersant is composed of diethylene glycol and 4-hydroxybutyl vinyl ether in a weight ratio of 1:(0.2-0.5).

3. The double-layer coated microcapsule fragrance according to claim 1, characterized in that, The oil-soluble core fragrance is any one of sandalwood, lavender, rose, artemisia, or jasmine.

4. The double-layer coated microcapsule fragrance according to claim 1, characterized in that, The pH adjuster is any one of triethanolamine, diethanolamine, and isopropanolamine.

5. The double-layer coated microcapsule fragrance according to claim 1, characterized in that, The diameter of the capsule wall of the double-layered microcapsule fragrance is 15-25µm.

6. A method for preparing a double-layer-coated microcapsule fragrance as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Hydroxypropyl-β-cyclodextrin and hydroxyethyl chitosan were added to a portion of water to prepare mixture I; S2. Add glycerol / inulin lauryl carbamate and dispersant to the remaining water, stir and disperse, then add oil-soluble capsule flavoring, continue stirring and dispersing to obtain mixture II; S3. Add mixture II to mixture I, heat and stir to form an inner coating layer, and obtain a single-layer coated emulsion; S4. Add the silicone-modified polyurethane emulsion, polymethyl vinyl ether copolymer maleic acid pH adjuster and water to the reaction equipment, heat and stir to obtain mixture III; S5. Add mixture III to the single-layer coated emulsion, heat and stir to form an outer coating layer, and obtain a double-layer coated microcapsule fragrance.

7. The method for preparing a double-layer coated microcapsule fragrance according to claim 6, characterized in that, The weight of the oil-soluble core fragrance is 3.5-5.5% of the weight of the monolayer encapsulated emulsion.

8. The method for preparing a double-layer coated microcapsule fragrance according to claim 6, characterized in that, The heating temperature in step S3 is 60-80℃, the stirring rate is 800-1200 r / min, and the stirring time is 1.5-2.5 h.

9. The method for preparing a double-layer coated microcapsule fragrance according to claim 6, characterized in that, The heating temperature in step S5 is 50-60℃, the stirring rate is 400-800 r / min, and the stirring time is 1-2 h.

10. The application of a double-layered microcapsule fragrance prepared by the method for preparing a double-layered microcapsule fragrance as described in any one of claims 6-9, characterized in that, It is used in textile fabrics.

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