Temperature-sensitive slow-release perfume capsule as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of functional polymer materials, and particularly discloses a temperature-sensitive slow-release perfume capsule as well as a preparation method and application thereof. In the thermo-sensitive slow-release perfume capsule, the thermo-sensitive polymer material matrix contains the water-absorbing nano filler and the amine compound, so that the service life of the thermo-sensitive slow-release perfume capsule in a high-temperature environment can be remarkably prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a temperature-sensitive sustained-release fragrance capsule and a preparation method and application thereof. Background Art

[0002] Spices are everywhere in people's daily life, such as common aromatherapy, cigarettes and other products. Scented products are often needed in car interiors to neutralize some odors in the car, especially in hot weather, when the temperature inside the car is high, and the small molecule volatile substances in the car interior materials are more likely to evaporate, producing a more unpleasant and irritating odor. Therefore, in the high temperature environment of summer, this phenomenon becomes more and more obvious, and the car needs the fragrance of spices more. Due to the volatility of spices, the fragrance ingredients are generally placed in a carrier, and the most common method is to prepare it into a sustained-release gel. However, considering the special use environment in the above-mentioned car, a temperature-controlled sustained-release fragrance product is particularly needed, and its fragrance release rate can change with temperature. When the temperature is high, it can have a faster release rate; when the temperature is low, the release rate slows down.

[0003] At present, there are temperature-controlled slow-release fragrance products, which load fragrance into a porous carrier, and then wrap a layer of temperature-sensitive gel shell on the surface of the porous carrier. The temperature-sensitive gel material of the shell expands and contracts with the temperature, thereby controlling the release rate of the fragrance. However, at present, such temperature-controlled slow-release fragrances will become sticky on the surface due to the high temperature environment, especially in summer when the temperature in the car can be as high as 40-50°C. This is because the material decomposes in this environment to produce small molecules that migrate to the gel surface, or the molecular fluidity of the temperature-sensitive gel material is enhanced. This phenomenon will affect the temperature sensitivity of the fragrance slow release and significantly reduce the service life of such fragrance products.

[0004] Therefore, there is still a need to continue to develop a sustained-release automotive fragrance product that can still have stable temperature sensitivity in a high-temperature environment. Summary of the invention

[0005] In view of the problems in the prior art related to the poor life of temperature-sensitive sustained-release automotive fragrance products, the present invention provides a temperature-sensitive sustained-release fragrance capsule and a preparation method and application thereof.

[0006] To achieve the above purpose, the following technical solutions are specifically included:

[0007] A temperature-sensitive sustained-release flavor capsule comprises a capsule shell and a core material coated in the capsule shell, wherein the core material is porous silica loaded with flavors, and the capsule shell comprises the following components in parts by weight: 99-102 parts of a temperature-sensitive polymer material, 9-22 parts of a nano water-absorbing filler, and 0.4-16 parts of an amine compound.

[0008] In the core material of the thermosensitive sustained-release flavor capsule of the invention, the porous structure of silica is used to adsorb volatile flavor molecules, so that the flavor can be slowly released from the porous silica matrix; the core material is coated with a capsule shell containing a thermosensitive polymer. At a higher temperature, the thermosensitive polymer chain moves and shrinks to form pores, which promotes the release of the flavor molecules; at a lower temperature, the mobility of the thermosensitive polymer chain decreases, the molecular chain gradually stretches, the pores shrink, and the release rate of the flavor molecules is inhibited, thereby achieving a thermosensitive sustained-release effect; the capsule shell of the invention also includes a nano water-absorbing filler and an amine compound. The nano water-absorbing filler is at high temperature. In an environment, moisture in the air can be adsorbed into the capsule shell through the pores of the thermosensitive polymer material in the capsule shell. The amine compounds in the capsule shell have polar amine groups with certain activity, which can react with polar water molecules to be protonated and carry a certain charge, forming small molecular charged colloid particles in the matrix of the thermosensitive polymer material. The charged colloid particles can adsorb some small molecules in the capsule shell to prevent them from diffusing to the capsule surface. At the same time, they can also play a certain flocculation role, reducing the fluidity of the capsule shell material at high temperature, so that it can maintain a good aroma sustained-release effect, as well as achieve good temperature control sensitivity and extend service life.

[0009] Preferably, the capsule shell comprises the following components in parts by weight: 100 parts of temperature-sensitive polymer material, 10-20 parts of nano water-absorbing filler, and 0.5-15 parts of amine compound.

[0010] Preferably, in the capsule shell, the mass percentage of the temperature-sensitive polymer material in the capsule shell is not less than 60%, and more preferably not less than 70%.

[0011] Preferably, the temperature-sensitive polymer material includes at least one of poly (N,N-dimethylacrylamide), poly (N,N-diethylacrylamide) and poly (N-isopropylacrylamide-polyacrylamide).

[0012] Preferably, the molecular weight of the temperature-sensitive polymer material is 7000-20000 g / mol.

[0013] The thermosensitive polymer material within the above molecular weight range is used as the matrix of the capsule shell and has high temperature sensitivity. The present invention uses a dialysis bag to intercept the thermosensitive polymer material within the above molecular weight range, and the dispersion effect is relatively stable and not easy to agglomerate.

[0014] Preferably, the nano water-absorbing filler includes at least one of nano calcium carbonate, nano silicon dioxide, nano activated carbon, nano calcium sulfate, nano calcium chloride, and molecular sieve.

[0015] Nano calcium carbonate is further preferred because it has a certain porosity and has a higher resistance to its fluidity in the thermosensitive polymer matrix.

[0016] Preferably, the amine compound includes at least one of N-benzylaniline, ethylenediamine, 3-(N-ethylamino)heptane, 3-methyl-2-(N-methylamino)pentane, 4-imino-2-pentanone, and ethyl p-aminobenzoate.

[0017] Preferably, the mass ratio of the nano water-absorbing filler to the amine compound is (0.1-0.155): (0.005-0.06).

[0018] Under the above mass ratio, the sustained-release effect of the temperature-sensitive sustained-release flavor capsule is better.

[0019] Preferably, in the core material, the mass ratio of porous silica to fragrance is 1:(2-5).

[0020] The carrier for loading fragrances in the present invention is porous silica, and this type of carrier can load more fragrances.

[0021] Preferably, the mass ratio of the capsule shell to the core material is 1:(0.5-5), further preferably the mass ratio of the capsule shell to the core material is 1:(1-2.5), and further preferably the mass ratio of the capsule shell to the core material is 1:(1-2). At the above mass ratio of the capsule shell to the core material, the capsule has better effects of sustained release and maintaining structural stability.

[0022] Preferably, the fragrance includes at least one of mint essence, sweet orange oil, citral, rose oil, geranium oil, lavender oil and sandalwood oil.

[0023] Preferably, the porous silica is homemade or commercially available.

[0024] The present invention provides a method for preparing the temperature-sensitive sustained-release flavor capsule, comprising the following steps:

[0025] (1) grinding and mixing spices and porous silica under vacuum conditions to obtain a core material;

[0026] (2) The core material, a polymerizable monomer for preparing a thermosensitive polymer material, an initiator, a catalyst, a nano water-absorbing filler, an amine compound and water are mixed to carry out a polymerization reaction, and the mixture is dialyzed, filtered, washed and dried to obtain the thermosensitive sustained-release flavor capsule.

[0027] Preferably, in step (1), the grinding time is 0.5-2h.

[0028] Preferably, in step (1), the weight ratio of the porous silica to the fragrance is 1:(3-5).

[0029] Preferably, in step (2), the polymerizable monomer for preparing the temperature-sensitive polymer material comprises at least one of acrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide and N-isopropylacrylamide.

[0030] Preferably, in step (2), the mass ratio of the core material to the polymer monomer for preparing the temperature-sensitive polymer material is 1:(1-5).

[0031] Preferably, in step (2), the mass ratio of the polymerizable monomer to the initiator for preparing the temperature-sensitive polymer material is 1:(0.002-0.05).

[0032] Preferably, in step (2), the initiator comprises a peroxide initiator, and more preferably, the initiator comprises hydrogen peroxide.

[0033] Preferably, in step (2), the catalyst comprises ferric chloride.

[0034] Preferably, in step (2), the mass ratio of the polymer monomer used to prepare the temperature-sensitive polymer material to the catalyst is 1:(0.001-0.01).

[0035] Preferably, in step (2), the mass ratio of the polymer monomer for preparing the temperature-sensitive polymer material to the nano water-absorbing filler is 1:(0.005-0.15).

[0036] Preferably, in step (2), the mass ratio of the polymer monomer for preparing the temperature-sensitive polymer material to the amine compound is 1:(0.1-0.2).

[0037] Preferably, in step (2), the mass ratio of the polymer monomer for preparing the temperature-sensitive polymer material to water is 1:(40-100).

[0038] Preferably, in step (2), the polymerization reaction temperature is 50-100° C., and the polymerization reaction time is 12-48 h.

[0039] In addition, the temperature-sensitive sustained-release flavor capsule of the present invention can also be prepared by the following method, comprising the following steps:

[0040] (1) dissolving silicate in alkane to obtain a silicate solution; dissolving a surfactant in water to obtain a surfactant solution, mixing the silicate solution and the surfactant solution, and then adding a base to perform a gelation reaction to obtain a silica gel;

[0041] (2) calcining the silica gel to obtain porous silicon dioxide;

[0042] (3) grinding and mixing the fragrance and the porous silica under vacuum conditions to obtain a core material;

[0043] (4) The core material, a polymerizable monomer for preparing a thermosensitive polymer material, an initiator, a catalyst, a nano water-absorbing filler, an amine compound and water are mixed to carry out a polymerization reaction, and the mixture is dialyzed, filtered, washed and dried to obtain the thermosensitive sustained-release flavor capsule.

[0044] In the method of the present invention, the fragrance is loaded into a porous silica carrier to prepare a core material, and a thermosensitive polymer material is further loaded on the surface of the core material by in-situ polymerization, and a water-absorbent nanofiller and an amino compound are added during the in-situ polymerization process, which can significantly improve the service life of the thermosensitive sustained-release fragrance capsule in a high temperature environment.

[0045] Preferably, in step (1), the concentration of silicate in the silicate solution is 0.1-0.5 g / mL.

[0046] Preferably, in step (1), the alkane comprises n-hexane.

[0047] Preferably, in step (1), the concentration of the surfactant solution is 0.001-0.01 g / mL.

[0048] Preferably, in step (1), the volume ratio of the silicate solution to the surfactant solution is 15-30:150-200.

[0049] Preferably, in step (1), the mass ratio of silicate to alkali is 3-5:1.9-2.5.

[0050] Preferably, in step (1), the silicate comprises tetraethyl silicate.

[0051] Preferably, in step (1), the surfactant includes at least one of cetyltrimethylammonium bromide, cetyltrimethylammonium chloride and polyethylene glycol.

[0052] Preferably, in step (1), the base comprises at least one of ammonia, sodium hydroxide and potassium hydroxide.

[0053] Preferably, in step (1), the temperature of the gelation reaction is 20-80° C., and the time of the gelation reaction is 12-48 h.

[0054] Preferably, in step (2), the calcination temperature is 300-600° C., and the calcination time is 2-8 hours.

[0055] Preferably, in step (3), the grinding time is 0.5-2h.

[0056] Preferably, in step (3), the weight ratio of the porous silica to the fragrance is 1:(3-5).

[0057] Preferably, in step (4), the polymerizable monomer for preparing the temperature-sensitive polymer material comprises at least one of acrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide and N-isopropylacrylamide.

[0058] Preferably, in step (4), the mass ratio of the core material to the polymer monomer for preparing the temperature-sensitive polymer material is 1:(1-5).

[0059] Preferably, in step (4), the mass ratio of the polymerizable monomer to the initiator for preparing the temperature-sensitive polymer material is 1:(0.002-0.05).

[0060] Preferably, in step (4), the initiator comprises a peroxide initiator, and more preferably, the initiator comprises hydrogen peroxide.

[0061] Preferably, in step (4), the catalyst comprises ferric chloride.

[0062] Preferably, in step (4), the mass ratio of the polymer monomer used to prepare the temperature-sensitive polymer material to the catalyst is 1:(0.001-0.01).

[0063] Preferably, in step (4), the mass ratio of the polymer monomer for preparing the temperature-sensitive polymer material to the nano water-absorbing filler is 1:(0.005-0.15).

[0064] Preferably, in step (4), the mass ratio of the polymer monomer for preparing the temperature-sensitive polymer material to the amine compound is 1:(0.1-0.2).

[0065] Preferably, in step (4), the mass ratio of the polymer monomer for preparing the temperature-sensitive polymer material to water is 1:(40-100).

[0066] Preferably, in step (4), the polymerization reaction temperature is 50-100° C., and the polymerization reaction time is 12-48 h.

[0067] The application of the above-mentioned temperature-sensitive sustained-release aromatherapy capsules in the preparation of automobile interior materials is also within the scope of protection of the present invention. More specifically, the temperature-sensitive sustained-release aromatherapy capsules can be added to the coating on the surface of the automobile interior, and the automobile interior can be surface treated to make the interior of the car have a fragrance, such as dispersing the temperature-sensitive sustained-release aromatherapy capsules in a color paste, and then coating the surface of the automobile interior to make the automobile interior have a specific fragrance and color coating. Common color pastes include aluminum paste, titanium dioxide white paste, carbon black paste, water-based aluminum paste and other coatings.

[0068] Compared with the prior art, the present invention has the following beneficial effects: in the temperature-sensitive sustained-release flavor capsule of the present invention, the temperature-sensitive polymer material matrix contains water-absorbing nanofillers and amine compounds, which can significantly improve the service life of the temperature-sensitive sustained-release flavor capsule in a high temperature environment. DETAILED DESCRIPTION

[0069] In order to better illustrate the purpose, technical scheme and advantages of the present invention, the present invention will be further described below through specific examples. The test methods used in the examples and / or comparative examples are conventional methods unless otherwise specified; the materials, reagents, etc. used can be obtained from commercial channels unless otherwise specified.

[0070] Water-absorbent nanofillers:

[0071] Nano calcium carbonate: brand name SPSL-1, Jiangxi Huaming;

[0072] Nano-silicon dioxide: CW-SiO2-003, Shanghai Chaowei Nanotechnology Co., Ltd.;

[0073] Porous silica: Anhui Yishitong Materials Technology Co., Ltd., with a specific surface area of ​​200-260m 2 / g;

[0074] Nano activated carbon: Egret Seisei, EnviroChemical Company;

[0075] N-Benzylaniline, 4-imino-2-pentanone, ethylenediamine, and ethyl p-aminobenzoate were commercially available and of analytical grade.

[0076] Example 1

[0077] A temperature-sensitive sustained-release flavor capsule comprises the following preparation steps:

[0078] (1) 3 mL of tetraethyl silicate was dissolved in 20 mL of n-hexane, 1.0 g of hexadecyltrimethylammonium bromide was dissolved in 160 mL of deionized water and then added to the tetraethyl silicate solution, and then 7 mL of 28% ammonia water was added, and ultrasonically dissolved at room temperature (about 25° C.) until silica gel was formed (about 24 h), and then placed in a muffle furnace (air) at 300° C. and calcined for 5 h, and then washed with 95% ethanol solution and deionized water in sequence to obtain porous silica;

[0079] (2) Grinding and mixing mint essence and porous silica under vacuum conditions, wherein the mass ratio of mint essence to porous silica is 3:1, and after grinding for 1 hour, a porous silica core material loaded with fragrance is prepared;

[0080] (3) 1 g of core material, 0.5 g of acrylamide, 0.5 g of N-isopropylacrylamide, 0.01 g of hydrogen peroxide, 0.005 g of ferrous chloride, 0.15 g of water-absorbing nanofiller nano calcium carbonate, and 0.01 g of amine compound N-benzylaniline are dispersed in 50 mL of water, heated to 85° C. and stirred for reaction for 12 h, and then dialyzed through a dialysis bag to obtain a capsule with a molecular weight cutoff of 10,000 g / mol. After filtration, washing with clean water, and drying, the temperature-sensitive sustained-release flavor capsule can be obtained.

[0081] Example 2-11

[0082] The difference between Example 2-11 and Example 1 is that in step (3), the amount of core material, the type and amount of nano water-absorbing filler or the type and amount of amine compound are different, see Table 1 for details.

[0083] Example 12

[0084] The difference between Example 12 and Example 1 is that this example does not use the homemade porous silica in step (1), but uses commercially available porous silica instead, and the rest is the same.

[0085] Embodiment 13

[0086] The difference between Example 13 and Example 1 is that in step (3), the capsules with a molecular weight cutoff of 7000 g / mol are dialyzed through a dialysis bag, and the rest are the same.

[0087] Embodiment 14

[0088] The difference between Example 14 and Example 1 is that in step (3), the capsules with a molecular weight cutoff of 20,000 g / mol are dialyzed through a dialysis bag, and the rest are the same.

[0089] Comparative Example 1

[0090] The difference between this comparative example and Example 1 is that in step (3), no nano calcium carbonate and N-benzylaniline are added, see Table 2 for details.

[0091] Comparative Example 2

[0092] The difference between this comparative example and Example 1 is that in step (3), no nano calcium carbonate is added, see Table 2 for details.

[0093] Comparative Example 3

[0094] The difference between this comparative example and Example 1 is that in step (3), no N-benzylaniline is added, see Table 2 for details.

[0095] Comparative Example 4

[0096] The difference between this comparative example and Example 1 is that in step (3), the amount of nano-calcium carbonate added is 0.20 g, and the amount of N-benzylaniline added is 0.25 g, see Table 2 for details.

[0097] Table 1 (in g)

[0098]

[0099] Table 2 (in g)

[0100] Raw materials / group Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Poly (N-isopropylacrylamide)-polyacrylamide-1000g / mol 1 1 1 1 Nano Calcium Carbonate - - 0.15 0.2 N-Benzylaniline - 0.01 - 0.25 core material 1 1 1 1

[0101] Performance Testing

[0102] The performance of the temperature-sensitive sustained-release flavor capsules obtained in the above examples and comparative examples was characterized, and the specific test items, test methods and results are as follows:

[0103] (1) Testing the fragrance release rate at 25°C for 48 h, 45°C for 48 h, and 60°C for 48 h, respectively, and after 48 h at 45°C, pressing the capsule with a finger to observe whether it becomes sticky;

[0104] (2) According to the test temperature of step (1), the capsules are respectively subjected to 48 h at 25° C., 48 h at 45° C., and 48 h at 60° C. as one cycle. After 30 cycles, the aroma release rate of the capsules is tested at 25° C. to evaluate the temperature sensitivity of the aroma release of the capsules;

[0105] The release rate of the fragrance is specifically tested by the “weight loss method” to test the fragrance release rate of the capsule at different temperatures. The 48h release rate at a certain temperature (%) = (m0-m t ) / m0*100%,m t is the mass of the capsule after standing for 48 hours, m0 is the mass of the initial capsule, and the test results are shown in Table 3 below.

[0106] Table 3

[0107]

[0108] It can be seen from the above embodiments that the aroma release rate of the temperature-sensitive sustained-release aroma capsule prepared by the present invention is low, has a good sustained-release effect, can release the aroma for a long time, that is, has a long service life, will not be sticky at high temperature, and after repeated use at different temperatures, the structure of the capsule is stable, the sustained-release rate of the aroma is still low, and can maintain good temperature sensitivity, which is a stable temperature-sensitive sustained-release aroma capsule. Among them, the temperature-sensitive sustained-release aroma capsule of the above embodiment of the present invention, after 30 cycles at different temperatures, as the concentration of the fragrance in the capsule decreases, the structure of the capsule is still relatively complete, therefore, after multiple cycles, the aroma release rate will be lower than the initial release rate, but the aroma release rate of the capsule is maintained at 1-2.5%, not only releasing enough actual required aroma concentration, but also releasing at a low rate, with obvious sustained-release effect, which can further prove that the temperature-sensitive sustained-release aroma capsule prepared by the present invention has a stable structure and good temperature sensitivity.

[0109] It can be seen from Example 1 and Comparative Examples 1-3 that the capsules in Comparative Examples 1-3 are sticky at high temperatures. After 30 cycles at different temperatures, although the concentration of the fragrance in the capsules is reduced, the fragrance release rate of the capsules after 30 cycles is significantly greater than the initial fragrance release rate, with an increase of more than 95%. It can be clearly seen that the sustained-release effect of the capsules in Comparative Examples 1-3 is obviously deteriorated, and the temperature sensitivity is poor; it can be explained that the addition of water-absorbing nanofillers and amine compounds to the temperature-sensitive sustained-release fragrance capsules of the present invention can significantly reduce the rate of fragrance release, improve the defect of being sticky at high temperatures, and improve the stability and service life of the temperature-sensitive sustained-release fragrance capsules in high temperature environments. In addition, it can be seen from Example 8 and Comparative Example 4 that the addition of amine compounds is too much, and it is easy to produce agglomeration in the temperature-sensitive polymer matrix, the uniformity of the capsules is poor, and the structural stability of the capsules is reduced, resulting in a significant decrease in the temperature sensitivity of the capsules.

[0110] It can be seen from Examples 1-5 that the water-absorbing filler can be selected from nano calcium carbonate, nano silicon dioxide, and nano activated carbon, and the amine compound can be selected from N-benzylaniline, 4-imino-2-pentanone, ethylenediamine, and ethyl p-aminobenzoate. When nano calcium carbonate and N-benzylaniline, nano activated carbon, and ethyl p-aminobenzoate are compounded, after 30 cycles, the sustained release rate of the capsule is lower, and the sustained release and structural stability maintaining effects of the capsule are better.

[0111] From Examples 1, 6-8, 9-11, it can be seen that the mass ratio of nano-calcium carbonate and N-benzylaniline can be selected as (0.1-0.2): (0.005-0.15), and the mass ratio of capsule shell to core material can be selected as 1: (0.5-2.5). More preferably, the mass ratio of capsule shell to core material is 1: (1-2). At this time, after 30 cycles, the sustained release rate of the capsule is lower, and the sustained release and structural stability of the capsule are better. From Examples 13-14, it can be seen that the molecular weight of the thermosensitive polymer material can be 7000-20000 g / mol. Within the above molecular weight range, the obtained capsule has a lower sustained release rate after 30 cycles, and the sustained release and structural stability of the capsule are excellent.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A temperature-sensitive sustained-release flavor capsule, characterized in that: The capsule shell comprises a capsule shell and a core material coated in the capsule shell. The core material is porous silica loaded with fragrance. The capsule shell comprises the following components in parts by weight: 99-102 parts of a temperature-sensitive polymer material, 9-22 parts of a nano water-absorbing filler, and 0.4-16 parts of an amine compound.

2. The temperature-sensitive sustained-release flavor capsule according to claim 1, characterized in that: The temperature-sensitive polymer material includes at least one of poly N,N-dimethylacrylamide, poly N,N-diethylacrylamide, and poly N-isopropylacrylamide-polyacrylamide.

3. The temperature-sensitive sustained-release flavor capsule according to claim 1, characterized in that: The nano water-absorbing filler includes at least one of nano calcium carbonate, nano silicon dioxide, nano activated carbon, nano calcium sulfate, nano calcium chloride and molecular sieve.

4. The temperature-sensitive sustained-release flavor capsule according to claim 1, characterized in that: The amine compound includes at least one of N-benzylaniline, ethylenediamine, 3-(N-ethylamino)heptane, 3-methyl-2-(N-methylamino)pentane, 4-imino-2-pentanone and ethyl p-aminobenzoate.

5. The temperature-sensitive sustained-release flavor capsule according to claim 1, characterized in that: The mass ratio of the nano water-absorbing filler to the amine compound is (0.1-0.155): (0.005-0.06).

6. The temperature-sensitive sustained-release flavor capsule according to claim 1, characterized in that: The mass ratio of the capsule shell to the core material is 1:(0.5-5).

7. The temperature-sensitive sustained-release flavor capsule according to claim 1, characterized in that: Include at least one of the following: In the core material, the mass ratio of porous silica to fragrance is 1:(2-5); The fragrance includes at least one of mint essence, sweet orange oil, citral, rose oil, geranium oil, lavender oil, and sandalwood oil; The molecular weight of the temperature-sensitive polymer material is 7000-20000 g / mol.

8. A method for preparing the temperature-sensitive sustained-release flavor capsule according to any one of claims 1 to 7, characterized in that: The steps include: (1) dissolving silicate in alkane to obtain a silicate solution; dissolving a surfactant in water to obtain a surfactant solution, mixing the silicate solution and the surfactant solution, and then adding a base to perform a gelation reaction to obtain a silica gel; (2) calcining the silica gel to obtain porous silicon dioxide; (3) grinding and mixing the fragrance and the porous silica under vacuum conditions to obtain a core material; (4) The core material, a polymerizable monomer for preparing a temperature-sensitive polymer material, an initiator, a catalyst, a nano water-absorbing filler, an amine compound and water are mixed to carry out a polymerization reaction, and then dialyzed, filtered, washed and dried.

9. Use of the temperature-sensitive sustained-release fragrance capsule according to any one of claims 1 to 7 in the preparation of automobile interior decoration materials.

10. An automotive interior coating, characterized in that: The invention comprises the temperature-sensitive sustained-release flavor capsule according to any one of claims 1 to 7.

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