Fragrant PVC (polyvinyl chloride) and preparation method thereof

Abstract

The invention discloses PVC with fragrance and a preparation method thereof, the PVC with fragrance comprises the following components in parts by weight: 100 parts of PVC resin and 1-5 parts of an essence carrier, the essence carrier has light absorption performance and a porous structure, essence is loaded on the essence carrier, the essence carrier and the PVC resin are melted and mixed, and ultrasonic cavitation treatment is performed to obtain the PVC with fragrance; the preparation method of the PVC with fragrance comprises the steps of carrier preparation, mixing and injection molding. The PVC with fragrance provided by the invention has the effect of prolonging the fragrance lasting time of the PVC.

Description

Technical Field

[0001] The invention belongs to the technical field of organic materials, and in particular relates to PVC with fragrance and a preparation method thereof. Background Art

[0002] PVC with aromatic smell is welcomed by people and widely used in many fields because of its unique sensory experience, psychological and physiological health care effects on people, and its function of adjusting the human nervous system.

[0003] For example, harmless scents such as fruits and flowers are often added to children's toys to attract children and enhance the fun of playing, while also covering up the unpleasant odor of plastic raw materials; scents are sometimes added to the packaging of food, cosmetics, detergents and other products to strengthen the brand image or to be consistent with the product content and enhance consumers' sensory enjoyment; fresh or luxurious scents are added to automotive interior decorative parts, such as dashboard covers, door panel trims, etc., to enhance the comfort of the vehicle interior environment.

[0004] PVC with aromatic smell is usually obtained by adding essence or essence microcapsules into the PVC system. The essence volatilizes slowly to make the PVC have fragrance. However, due to the volatility of the essence, the light stability of the essence is poor. In an environment with sufficient light conditions, the essence in the PVC system will dissipate too quickly, making the fragrance of the PVC with aromatic smell last for a short time. Summary of the invention

[0005] In view of the deficiencies of the prior art, the object of the present invention is to provide a PVC with fragrance and a preparation method thereof.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: On the one hand, a PVC with fragrance comprises the following components in parts by weight: 100 parts of PVC resin, 1 to 5 parts of flavor carrier, The flavor carrier has light absorption performance and a porous structure, and the flavor carrier carries flavor. The flavor carrier is melt-mixed with the PVC resin and then subjected to ultrasonic cavitation treatment to obtain the PVC with flavor.

[0007] Preferably, the flavor carrier is selected from one or more of POP, carbonized rice husk-based porous light absorber, and nanoporous material.

[0008] Preferably, the flavor carrier is selected from one or more of carbon black, mesoporous titanium dioxide, black silicon, porous graphene, graphene-based aerogel, activated carbon, carbon nanotubes, and carbon aerogel.

[0009] In the present invention, the flavor carrier is specifically selected from carbon black.

[0010] Preferably, the particle size of the flavor carrier is 10 to 100 nm.

[0011] Preferably, the flavor includes oil-soluble flavor.

[0012] In the present invention, the essence is specifically selected from lavender oil.

[0013] Preferably, it also includes auxiliary materials, which are selected from one or more of toughening agents, antioxidants, anti-ultraviolet agents, and lubricants.

[0014] Common toughening agents include polyurethanes, styrenes, polyolefins, polyesters, syndiotactic 1,2-polybutadiene, polyamides, etc. Specifically, the toughening agents available include POE, SEBS, TPU, SBS, EPDM, TPE-E, TPV, etc.

[0015] Common antioxidants include phenolic antioxidants, hindered phenolic antioxidants, phosphate antioxidants, phosphite antioxidants, etc. Specifically, the optional antioxidants include BHT, BHA, antioxidant 1010, antioxidant 1076, tris (nonylphenyl) phosphate, antioxidant 626, etc.

[0016] Common anti-ultraviolet agents include benzotriazoles, triazines, cyanoacrylates, etc. Specifically, the anti-ultraviolet agents that can be selected include nano zinc oxide, nano cerium oxide, and nano titanium dioxide.

[0017] In the present application, the auxiliary material is specifically selected from anti-ultraviolet agents, and the anti-ultraviolet agent is specifically selected from nano zinc oxide.

[0018] In the present application, nano zinc oxide is added to the PVC system. Nano zinc oxide has the characteristics of high transparency, high dispersibility, etc., and has anti-infrared and ultraviolet radiation and sterilization functions, which is beneficial to reduce the light intensity of the fragrance, thereby helping to increase the fragrance retention time of PVC.

[0019] On the other hand, a method for preparing PVC with fragrance comprises the following steps: Preparing the carrier: dissolving the flavor in an organic solvent to obtain a flavor solution; after the flavor solution is fully soaked in the flavor carrier, drying the flavor carrier to obtain a carrier loaded with the flavor; Mixing: Evenly mix the carrier containing the flavor with the PVC resin to obtain a mixture; Injection molding: The mixture is injection molded. During the injection molding process, the mixture is ultrasonically cavitated by an ultrasonic generator.

[0020] Preferably, in the injection molding step, the frequency of ultrasonic cavitation is 20kHz to 40kHz.

[0021] The main raw materials of the present invention are introduced as follows: Carbon black: In the present invention, carbon black can improve the mechanical strength of PVC. At the same time, as a carrier of flavor, carbon black has light absorption ability.

[0022] Oil-soluble flavors: Oil-soluble flavors have higher fragrance concentration, good heat resistance and longer fragrance retention time, and are suitable for thermal processing and oily systems. Water-soluble flavors have poor heat resistance and may lose some of their fragrance during high-temperature processing. Compared with water-soluble flavors, oil-soluble flavors can better withstand the injection molding process and lose less fragrance during the injection molding process.

[0023] In addition, in the step of preparing the carrier, the oil-soluble flavor can better withstand the drying process and has less aroma loss.

[0024] Compared with the prior art, the advantages of the present invention include: (1) The present invention provides a PVC with fragrance, wherein the fragrance carrier has a porous structure and can carry fragrance; at the same time, the fragrance carrier has light absorption performance, which can reduce the influence of light on the fragrance and slow down the volatilization rate of the fragrance, thereby facilitating the increase of the fragrance retention time of the PVC; (2) The present invention provides a scented PVC, in which the ultrasonic condition can improve the dispersibility of the flavor carrier during the injection molding process, so that the flavor carrier can be evenly dispersed in the PVC system, which is beneficial to improving the uniformity of the PVC system; (3) The present invention provides a scented PVC. During the injection molding process, due to acoustic cavitation, ultrasound will induce tiny bubbles in the resin. These bubbles will undergo a series of dynamic processes, including vibration, growth and final rapid collapse, which can locally increase the melt temperature. The higher local temperature can make the resin in this part more fluid and more fully blend with the flavor carrier under the action of ultrasound, so that the resin can better wrap the flavor carrier, which is beneficial to slow down the volatilization rate of the flavor and ultimately increase the fragrance retention time of the PVC. (4) The present invention provides a scented PVC, wherein the scent carrier has a porous structure, and the scent in the porous structure is not easily exposed to direct light, thereby reducing the light exposure to the scent and slowing down the volatilization rate of the scent, which is beneficial to increasing the scent retention time of the PVC.

[0025] (5) The present invention provides a scented PVC, wherein the scent carrier has a porous structure and has a good fixing effect on the scent, thereby helping to slow down the volatilization rate of the scent and increase the scent retention time of the PVC. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to understand the characteristics and effects of the present application, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used herein have the common meanings understood by those skilled in the art for the present application. In case of conflict, the definitions in this specification shall prevail.

[0027] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present application in any way, that is, the content of the present application can be implemented without being limited by any specific theory or mechanism.

[0028] As used herein, "this application" means "the present invention" or "the present disclosure".

[0029] The use of "one", "an", "a kind" or similar expressions to describe the components and technical features described in this application is merely for the convenience of expression and to provide a general meaning to the scope of this application. Therefore, such description should be understood to include one or at least one, and the singular also includes the plural, unless it is obvious that it refers to another meaning.

[0030] In this document, "or its combination" means "or any combination thereof", and "any one", "any one" means "any one", "any one" or "any one".

[0031] In this article, the terms "comprise", "include", "have", "contain" or any other similar terms are open-ended transitional phrases, which are intended to cover non-exclusive inclusions. For example, a composition or product containing multiple elements is not limited to the elements listed in this article, but may also include other elements that are not explicitly listed but are generally inherent to the composition or product. In addition, unless otherwise explicitly stated, the term "or" refers to an inclusive "or" rather than an exclusive "or". For example, any of the following situations satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist), A is false (or does not exist) and B is true (or exists), A and B are both true (or exist). In addition, in this article, the interpretation of the terms "comprise", "include", "have", and "contain" should be considered to have been specifically disclosed and simultaneously cover closed transitional phrases such as "consisting of", "consisting of", "the balance is", and "substantially consisting of", "mainly consisting of", "mainly consisting of", "basically containing", "basically consisting of", "basically consisting of", "essentially containing" and other transitional phrases.

[0032] In this article, all features or conditions such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for simplicity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be deemed to have covered and specifically disclosed all possible sub-ranges and individual values ​​within the range (including integers and fractions), especially integer values. For example, the range description of "1.0 to 8.0" or "between 1.0 and 8.0" or "between 1.0 and 8.0" should be deemed to have specifically disclosed all sub-ranges such as 1.0 to 8.0, 1.0 to 7.0, 2.0 to 8.0, 2.0 to 6.0, 3.0 to 6.0, 4.0 to 8.0, 3.0 to 8.0, etc., and should be deemed to cover endpoint values, especially sub-ranges defined by integer values, and should be deemed to have specifically disclosed individual values ​​such as 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, etc. Unless otherwise indicated, the foregoing method of interpretation applies to all contents of the entire application, regardless of whether the scope is broad or not.

[0033] If the quantity, concentration or other numerical value or parameter is expressed as a range, a preferred range (or a better range) or a series of upper and lower limits, it should be understood that all ranges consisting of any pair of the upper limit or preferred value (or a better value) of the range and the lower limit or preferred value (or a better value) of the range have been specifically disclosed herein, regardless of whether these ranges are disclosed separately. In addition, if a numerical range is mentioned herein, unless otherwise specified, the range should include its endpoints and all integers and fractions within the range.

[0034] In this document, numerical values ​​should be understood to have the accuracy of the number of significant digits of the numerical value, provided that the purpose of the invention can be achieved. For example, the number 40.0 should be understood to cover the range of 39.50 to 40.49.

[0035] In this article, for the use of Markush groups or optional terms to describe the features or examples of the present application, those skilled in the art should understand that all subgroups or any individual elements in the Markush group or option list can also be used to describe the present application. For example, if X is described as "selected from the group consisting of X1, X2 and X3", it also means that the claim that X is X1 and the claim that X is X1 and / or X2 and / or X3 have been fully described. Furthermore, for the use of Markush groups or optional terms to describe the features or examples of the present application, those skilled in the art should understand that any combination of subgroups or individual members of all elements in the Markush group or option list can also be used to describe the present application. Accordingly, for example, if X is described as "selected from the group consisting of X1, X2 and X3", and Y is described as "selected from the group consisting of Y1, Y2 and Y3", it means that the claim that X is X1 and / or X2 and / or X3 and Y is Y1 and / or Y2 and / or Y3 has been fully described.

[0036] Unless otherwise specified, in this application, a compound refers to a chemical substance formed by two or more elements connected by chemical bonds, including small molecule compounds and polymer compounds, but not limited thereto. The interpretation of a compound in this article is not limited to a single chemical substance, but can also be interpreted as the same type of chemical substances with the same composition or the same properties.

[0037] If not otherwise specified, in this application, polymer refers to the product formed by monomer polymerization, often including many polymer aggregates, each polymer is composed of many simple structural units repeatedly connected by covalent bonds, and the monomer is a compound of synthetic polymer. Polymers can include homopolymers, copolymers, prepolymers, etc., and are not limited to this. Homopolymers refer to polymers polymerized from a monomer. Copolymers include random copolymers (structures such as -AABABBBAAABBA-), alternating copolymers (structures such as -ABABABAB-), graft copolymers (structures such as -AA (A-BBBB) AA (A-BBBB) AAA-) and block copolymers (structures such as -AAAAA-BBBBBB-AAAAA-), etc. Prepolymers refer to a polymer with a lower molecular weight between the monomer and the final polymer, and the prepolymer contains reactive functional groups that can be further polymerized to obtain a fully cross-linked or hardened higher molecular weight product. Polymers certainly include oligomers, and are not limited to this. Oligomers, also known as low polymers, are polymers composed of 2 to 20 repeating units, usually 2 to 5 repeating units.

[0038] Unless otherwise specified, the "resin" in this application is a customary name for a synthetic polymer, which may include monomers, polymers thereof, combinations of monomers, combinations of polymers thereof, or combinations of monomers and polymers thereof, etc., and is not limited thereto.

[0039] If not otherwise specified, in the present application, modified products include products after modification of reactive functional groups of each resin, products after prepolymerization of each resin with other resins, products after crosslinking of each resin with other resins, products after copolymerization of each resin with other resins, and the like.

[0040] If not otherwise specified, the unsaturated bonds described in the present application refer to reactive unsaturated bonds, such as but not limited to unsaturated double bonds that can undergo cross-linking reactions with other functional groups, such as but not limited to unsaturated carbon-carbon double bonds that can undergo cross-linking reactions with other functional groups.

[0041] The unsaturated carbon-carbon double bonds described in the present application preferably include, but are not limited to, vinyl, vinylbenzyl, (meth)acryloyl, allyl or a combination thereof. Vinyl should include vinyl and vinylidene when interpreted. (Meth)acryloyl should include acryloyl and methacryloyl when interpreted.

[0042] Unless otherwise specified, the hydrocarbon groups described in this application include, but are not limited to, alkyl, alkenyl or alkynyl, and include their various isomers when interpreted. For example, a C1-C6 divalent hydrocarbon group is interpreted to include a C1-C6 divalent straight-chain hydrocarbon group, a C2-C6 divalent branched hydrocarbon group or a C3-C6 divalent cyclic hydrocarbon group. For another example, a propyl group should be interpreted to include n-propyl and isopropyl.

[0043] Unless otherwise specified, in this application, parts by weight represent relative parts by weight in a composition, which may be any weight unit, such as but not limited to kilograms, kilograms, grams, pounds, etc. For example, 100 parts by weight of polyphenylene ether resin may represent 100 kilograms of polyphenylene ether resin or 100 pounds of polyphenylene ether resin.

[0044] It should be understood that the features disclosed in the various embodiments herein may be arbitrarily combined to form the technical solution of the present application, as long as there is no contradiction in the combination of these features.

[0045] The present application will be described below with specific implementations and examples. It should be understood that these specific implementations and examples are merely illustrative and are not intended to limit the scope of the present application and its use.

[0046] Unless otherwise stated, the methods, reagents and conditions used in the following preparation examples, comparative examples and examples are conventional methods, reagents and conditions in the art.

[0047] In the following descriptions: PVC resin: density 1.35g / cm³, melting temperature 160℃.

[0048] Lavender oil: purity ≥99%, density 0.882g / mL, boiling point 204℃.

[0049] Carbon black: purity ≥99.8%, ignition temperature >600℃, available in three particle sizes: 10nm, 35nm, and 100nm; Nano zinc oxide: purity ≥99.7%, density 5.606g / cm³, particle size 30nm; Ethyl acetate: purity ≥99.5%.

[0050] Example Example 1 The raw materials used in this embodiment include: 100 g of PVC resin, 1 g of 10 nm carbon black, 10 g of lavender oil, and 10 g of ethyl acetate.

[0051] The preparation method of this embodiment includes: S1. Prepare a carrier: dissolve lavender oil in ethyl acetate to obtain a flavor solution, immerse carbon black in the flavor solution for 0.3 h, dry at 40° C. for 40 min, and weigh to obtain a carrier loaded with flavor; S2, mixing: the carrier containing the essence obtained in step S1 is mixed evenly with the PVC resin to obtain a mixture; S3. Injection molding: The mixture was injection molded to obtain a 1 mm thick PVC sheet at an injection molding temperature of 170° C. During the injection molding process, the mixture was ultrasonically cavitated by an ultrasonic generator at a frequency of 20 kHz and a duration of 30 min.

[0052] In this embodiment, the mass difference between carbon black before and after being loaded with flavor is 0.7g.

[0053] Example 2 The difference between this embodiment and embodiment 1 is that the raw material used in this embodiment contains 3 g of carbon black.

[0054] Example 3 The difference between this embodiment and embodiment 1 is that the raw material used in this embodiment contains 5 g of carbon black.

[0055] Example 4 The difference between this embodiment and embodiment 1 is that the raw materials used in this embodiment include 3 g of carbon black with a carbon black particle size of 35 nm, 20 g of ethyl acetate, and the frequency of ultrasonic cavitation in step S3 is 40 kHz.

[0056] Example 5 The difference between this embodiment and embodiment 1 is that the raw materials used in this embodiment include 3 g of carbon black with a particle size of 100 nm, 5 g of ethyl acetate, and the frequency of ultrasonic cavitation in step S3 is 30 kHz.

[0057] Example 6 The raw materials used in this embodiment include: 100 g of PVC resin, 3 g of 10 nm carbon black, 10 g of lavender oil, 10 g of ethyl acetate, and 3 g of 30 nm nano zinc oxide.

[0058] The preparation method of this embodiment includes: S1. Prepare a carrier: dissolve lavender oil in ethyl acetate to obtain a flavor solution, immerse carbon black in the flavor solution for 0.3 h, dry at 40° C. for 40 min, and weigh to obtain a carrier loaded with flavor; S2, mixing: the carrier containing essence obtained in step S1, nano zinc oxide, and PVC resin are uniformly stirred to obtain a mixture; S3. Injection molding: The mixture was injection molded to obtain a 1 mm thick PVC sheet at an injection molding temperature of 170° C. During the injection molding process, the mixture was ultrasonically cavitated by an ultrasonic generator at a frequency of 20 kHz and a duration of 30 min.

[0059] Comparative Example Comparative Example 1 The raw materials used in this comparative example include: 100 g of PVC resin and 0.7 g of lavender oil.

[0060] The preparation method of this comparative example comprises: D1. Mixing: Stir lavender oil and PVC resin evenly to obtain a mixture; D2. Injection molding: The mixture was injection molded to obtain a PVC sheet with a thickness of 1 mm. The injection molding temperature was 170° C. During the injection molding process, the mixture was ultrasonically cavitated by an ultrasonic generator. The frequency of ultrasonic cavitation was 20 kHz and the duration of ultrasonic cavitation was 30 min.

[0061] Comparative Example 2 The raw materials used in this comparative example include: 100 g of PVC resin, 1 g of 10 nm carbon black, and 0.7 g of lavender oil.

[0062] The preparation method of this comparative example comprises: D1. Mixing: Stir lavender oil, carbon black and PVC resin evenly to obtain a mixture; D2. Injection molding: The mixture was injection molded to obtain a PVC sheet with a thickness of 1 mm. The injection molding temperature was 170° C. During the injection molding process, the mixture was ultrasonically cavitated by an ultrasonic generator. The frequency of ultrasonic cavitation was 20 kHz and the duration of ultrasonic cavitation was 30 min.

[0063] Comparative Example 3 The raw materials used in this comparative example include: 100 g of PVC resin, 1 g of 10 nm carbon black, 10 g of lavender oil, and 10 g of ethyl acetate.

[0064] The preparation method of this comparative example comprises: D1. Preparation of carrier: Dissolve lavender oil in ethyl acetate to obtain a flavor solution, immerse carbon black in the flavor solution for 0.3 h, dry at 40° C. for 40 min, and weigh to obtain a carrier loaded with flavor; D2, mixing: the carrier containing the essence obtained in step S1 is mixed evenly with the PVC resin to obtain a mixture; D3. Injection molding: The mixture was injection molded to obtain a 1 mm thick PVC sheet at an injection molding temperature of 170°C.

[0065] Table 1 Raw materials and partial processes used in Examples 1 to 6 and Comparative Examples 1 to 3 Test example PVC resin / g Carbon black / g Particle size / nm Lavender oil / g Ethyl acetate / g Frequency / kHz Zinc oxide / g Example 1 100 1 10 10 10 20 \ Example 2 100 3 10 10 10 20 \ Example 3 100 5 10 10 10 20 \ Example 4 100 3 35 10 20 40 \ Example 5 100 3 100 10 5 30 \ Example 6 100 3 10 10 10 20 3 Comparative Example 1 100 \ 10 0.7 \ 20 \ Comparative Example 2 100 1 10 0.7 \ 20 \ Comparative Example 3 100 1 10 10 10 \ \ Performance Testing Existing technologies for odor detection mainly include gas chromatography, high performance liquid chromatography, gas chromatography-mass spectrometry (GC-MS) and other testing methods, all of which require complex odor collection and sampling of gas, liquid and solid samples. Due to the particularity of this experiment, it is impossible to use the above methods to give a specific quantitative comparison. The duration of fragrance requires manual comparison by professional fragrance appraisers.

[0066] The PVC sheets prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were tested as follows: Take 10cm×10cm samples of the PVC sheets prepared in Examples 1 to 6 and Comparative Examples 1 to 3, respectively, irradiate the samples in Examples 1 to 6 and Comparative Examples 1 to 3 with a 100W ultraviolet lamp in a ventilated environment, and the aroma appraiser conducts odor detection every 24 hours.

[0067] Test Results Table 2 The fragrance retention time of the PVC sheets prepared in Examples 1 to 6 and Comparative Examples 1 to 3 Test Case Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Fragrance duration / day 7 10 12 8 13 14 3 4 6 According to Table 2 above, by comparing Example 1 with Comparative Example 1, it can be seen that the fragrance retention time of the PVC sheet obtained in Example 1 is better than that in Comparative Example 1. The possible reason is that carbon black has a porous structure and has a good fixing effect on the essence, which is beneficial to slow down the volatilization rate of the essence and increase the fragrance retention time of the PVC.

[0068] By comparing Example 1 and Comparative Example 2, it can be obviously found that the fragrance retention time of the PVC sheet obtained in Example 1 is better than that of Comparative Example 2. This may be because carbon black has a porous structure, and the fragrance in the porous structure is not easily exposed to direct light, thereby reducing the light exposure to the fragrance and slowing down the volatilization rate of the fragrance, which is beneficial to increasing the fragrance retention time of the PVC.

[0069] By comparing Example 1 and Comparative Example 3, it can be obviously found that the fragrance retention time of the PVC sheet obtained in Example 1 is better than that of Comparative Example 3. The possible reason is that due to the acoustic cavitation, the ultrasound will induce the resin to produce tiny bubbles therein. These bubbles will undergo a series of dynamic processes, including vibration, growth and final rapid collapse, which can locally increase the melt temperature. The local higher temperature can make this part of the resin more fluid and more fully merge with the carbon black under the action of ultrasound, so that the resin can better wrap the carbon black, which is beneficial to slow down the volatilization rate of the flavor and ultimately improve the fragrance retention time of the PVC.

[0070] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A scented PVC, characterized in that: The composition comprises the following components in parts by weight: 100 parts of PVC resin, 1 to 5 parts of flavor carrier, The flavor carrier has light absorption performance and a porous structure, and the flavor carrier carries flavor. The flavor carrier is melt-mixed with the PVC resin and then subjected to ultrasonic cavitation treatment to obtain the PVC with flavor.

2. The scented PVC according to claim 1, characterized in that: The flavor carrier is selected from one or more of POP, carbonized rice husk-based porous light absorber, and nanoporous material.

3. The scented PVC according to claim 2, characterized in that: The flavor carrier is selected from one or more of carbon black, mesoporous titanium dioxide, black silicon, porous graphene, graphene-based aerogel, activated carbon, carbon nanotubes, and carbon aerogel.

4. The scented PVC according to claim 1, characterized in that: The particle size of the flavor carrier is 10 to 100 nm.

5. The scented PVC according to claim 1, characterized in that: The flavors include oil-soluble flavors.

6. The scented PVC according to claim 1, characterized in that: It also includes auxiliary materials, which are selected from one or more of toughening agents, antioxidants, anti-ultraviolet agents, and lubricants.

7. A method for preparing scented PVC as claimed in claim 1, characterized in that: The steps include: Preparing the carrier: dissolving the flavor in an organic solvent to obtain a flavor solution; after the flavor solution is fully soaked in the flavor carrier, drying the flavor carrier to obtain a carrier loaded with the flavor; Mixing: Evenly mix the carrier containing the flavor with the PVC resin to obtain a mixture; Injection molding: The mixture is injection molded. During the injection molding process, the mixture is ultrasonically cavitated by an ultrasonic generator.

8. The preparation method according to claim 7, characterized in that: In the injection molding step, the frequency of ultrasonic cavitation is 20kHz to 40kHz.