Secondary-explosion water-based fragrance capable of prolonging fragrance retention period and preparation process of secondary-explosion water-based fragrance

Abstract

The invention relates to a secondary explosion perfume capable of prolonging a perfume retention period and a preparation process of the secondary explosion perfume, and belongs to the technical field of air freshening aromatics. The invention relates to secondary-explosion water-based fragrance capable of prolonging fragrance retention period. The secondary-explosion water-based fragrance comprises an upper-layer material and a lower-layer material, wherein the lower-layer material comprises the following components in parts by weight: polar essence, a stabilizer, a dispersing agent, a preservative, a deodorant, a water-based pigment, a polar alcohol solvent and purified water; the upper-layer material comprises the following components in parts by weight: a non-polar solvent, a non-polar essence and an oily pigment. According to the technology, the water-based fragrance is layered up and down through polarity matching and density regulation and control, secondary fragrance explosion is achieved through inverted volatilization, the problem that traditional fragrance is uneven in concentration is solved, the fragrance holding period is prolonged, and the use experience is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of air fresheners and fragrances, and relates to a secondary burst fragrance that extends the fragrance duration and its preparation process. Background Technology

[0002] With the improvement of residents' living standards, water-based liquid fragrance products have shown a rapid development trend due to their advantages such as environmental protection, safety, and ease of use. Their core system is mostly composed of fragrance, solubilizer, alcohol, and water, and uses a passive evaporation mode of "cotton block and cotton wick" to release fragrance. However, the existing system lacks precise control over the release rate of fragrance and has not formed a layered fragrance design. As a result, the product has a strong fragrance in the early stage due to the rapid release of volatile components, but the fragrance becomes significantly weaker in the later stage as the effective ingredients are consumed. Consumers generally report that "the fragrance is strong for the first 15 days, and then the fragrance continues to weaken." At the same time, the single fragrance release mode is also difficult to meet users' needs for fragrance layering, which has become a core pain point that the industry urgently needs to solve.

[0003] Chitosan, as a natural polar polysaccharide, possesses both antibacterial properties and potential fragrance-stabilizing capabilities. Its addition to fragrance formulations improves fragrance retention. However, using chitosan alone has significant drawbacks: First, chitosan has poor water solubility, easily agglomerating and clumping in aqueous fragrance systems, making it difficult to disperse evenly and form a stable interaction with fragrances. Second, its molecular structure lacks hydrophobic functional segments, only weakly delaying fragrance evaporation through a small number of hydrogen bonds. Furthermore, chitosan alone cannot be adapted to layered fragrance designs; it cannot form a stable boundary with non-polar systems, nor can it support the independent release of multiple fragrances, making it difficult to meet users' needs for a layered fragrance experience. Summary of the Invention

[0004] The purpose of this invention is to provide a secondary burst fragrance and its preparation process for extending the fragrance lifespan. This technology uses polarity matching and density control to make the water-based fragrance form upper and lower layers, and the inverted evaporation achieves secondary burst fragrance, solving the problem of uneven concentration in traditional fragrances, extending the fragrance lifespan and improving the user experience.

[0005] The objective of this invention can be achieved through the following technical solutions: A secondary burst fragrance with extended scent duration comprises an upper layer and a lower layer, wherein the volume ratio of the upper layer to the lower layer is 5-7:3-5. The lower layer comprises, by weight, the following components: 4.8-5.4 parts polar fragrance, 0.9-1.2 parts stabilizer, 1.1-1.3 parts dispersant, 0.2-0.3 parts preservative, 0.4-0.5 parts deodorizer, 0.2-0.3 parts water-based pigment, 34-38 parts polar alcohol solvent, and 50-60 parts purified water. The upper layer comprises, by weight, the following components: 90-95 parts non-polar solvent, 4-4.5 parts non-polar fragrance, and 1.0-1.5 parts oil-based pigment.

[0006] As a preferred technical solution of the present invention, the present invention achieves immiscibility between the lower layer material and the upper layer material through the difference in solvent polarity and density, and then the density difference is precisely controlled by the solvent ratio to form a stable layered structure. When used upside down, it achieves a secondary aroma burst by releasing the polar fragrance in the lower layer first and the non-polar fragrance in the upper layer later.

[0007] As a preferred embodiment of the present invention, the amino and Schiff base structures of the chitosan derivative in the stabilizer have both antibacterial activity and work synergistically with the preservative phenoxyethanol to inhibit microbial growth.

[0008] As a preferred embodiment of the present invention, the polar fragrance is one or more of geraniol, phenylethyl alcohol, vanillin, benzaldehyde, hexanal, and rose fragrance. Preferably, the polar fragrance is a mixture of rose fragrance and vanillin in a mass ratio of 3:2.

[0009] As a preferred embodiment of the present invention, the polar alcohol solvent is one or more of anhydrous ethanol, isohexanediol, 1,2-propanediol, butanediol, ethylene glycol, and glycerol; preferably, the alcohol solvent is a mixture of anhydrous ethanol and isohexanediol in a mass ratio of 3:4.

[0010] As a preferred embodiment of the present invention, the dispersant is composed of PEG-7 and MPEG-200 mixed in a mass ratio of 1:1, and the dispersant ensures uniform dispersion of the stabilizer by adjusting the interfacial tension.

[0011] As a preferred embodiment of the present invention, the preservative is one or both of phenoxyethanol and ethylparaben.

[0012] As a preferred embodiment of the present invention, the non-polar solvent is one or more of liquid paraffin, white oil, hydrocarbon solvents and vegetable oils.

[0013] As a preferred embodiment of the present invention, the nonpolar fragrance is one or more of d-limonene, L-limonene, pinene, myrcene, caryophyllene, peach aldehyde, coumarin, and cedrol.

[0014] As a preferred embodiment of the present invention, the aqueous pigment is hibiscus red; the oily pigment is corn yellow or marigold pigment; and the deodorizer is eucalyptus oil, which decomposes environmental odors through chemical adsorption.

[0015] As a preferred embodiment of the present invention, the method for preparing the stabilizer is as follows: 1) Mix 3-mercapto-1,2-propanediol and pure ethanol, add an initiator and sonicate. Under an inert gas atmosphere, slowly add n-hexylphenyl acrolein and stir continuously at a constant temperature. Centrifuge to remove the supernatant to obtain the intermediate. 2) Under an inert gas atmosphere, the intermediate and pure ethanol are mixed to form a mixture. The mixture is slowly added to the chitosan solution and stirred and sonicated. After cooling, the solvent is removed by rotary evaporation, washed, and vacuum dried to obtain the stabilizer.

[0016] As a preferred embodiment of the present invention, the inert gas atmosphere in step 1) is a nitrogen gas atmosphere, the stirring speed of the continuous constant temperature stirring is 400-600 r / min, the temperature is 58-65℃, and the stirring time is 5-6 h, the ratio of the amount of n-hexylphenyl acrolein, 3-mercapto-1,2-propanediol, pure ethanol and initiator is 8.2-9.0 g : 5.0-5.5 g : 60-70 mL : 0.20-0.22 g, and the initiator is AIBN.

[0017] As a preferred embodiment of the present invention, the inert gas atmosphere in step 2) is a nitrogen gas atmosphere; the stirring and ultrasonic treatment temperature is 60-65℃, the ultrasonic power is 300W, and the time is 3.0-3.5h; the cooling is cooling to room temperature; the washing is washing with anhydrous ethanol 3-4 times; the vacuum drying is vacuum drying at 60℃ to constant weight; the ratio of the intermediate, pure ethanol, and chitosan solution is 6.0-6.5g:45-50mL:50-55mL; the chitosan solution is prepared by mixing chitosan and 2wt% acetic acid aqueous solution at a ratio of 2.8-3.0g:50-55mL; the degree of deacetylation of the chitosan is ≥90%, and the weight-average molecular weight is 50,000-100,000.

[0018] A method for preparing a secondary burst fragrance with extended fragrance duration, the method comprising the following steps: Weigh the raw materials of the upper layer according to the weight proportions and mix them evenly. Weigh the raw materials of the lower layer according to the weight proportions and mix them evenly. Pour the lower layer material and the upper layer material into the bottle at a volume ratio of and let it stand for 2.0-2.5 hours to obtain the final product.

[0019] The beneficial effects of this invention are: This technology achieves secondary fragrance release through a dual-stage evaporation system: the water-based liquid fragrance is divided into upper and lower layers, using an inverted evaporation method. The lower layer releases a high-concentration fragrance first; once this is depleted and the scent fades, the upper layer replenishes the fragrance, creating a second fragrance peak. Stable stratification is achieved through "polarity matching and density control": the lower layer uses a polar solvent matched with a polar fragrance, while the upper layer uses a non-polar solvent matched with a non-polar fragrance. Simultaneously, the solvent ratio is precisely controlled to manage the density difference between the upper and lower layers, ensuring that the two layers are immiscible and their fragrances are independent. The product can quickly reformat itself after standing, transportation, or shaking without affecting its use. By combining the differences in fragrance evaporation rates (faster evaporation in the lower layer, slower evaporation in the upper layer), the fragrance layers and longevity are optimized, effectively solving the pain points of traditional water-based fragrances being too strong initially and too weak later, significantly extending the fragrance duration, and offering simple operation and significantly improved user satisfaction. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below. Example 1

[0021] A second-layer fragrance with extended scent retention includes an upper layer and a lower layer, wherein the volume ratio of the upper layer to the lower layer is 6:4. The lower layer comprises, by weight, the following components: 4.8 parts polar fragrance, 0.9 parts stabilizer, 1.1 parts dispersant, 0.2 parts preservative, 0.4 parts deodorizer, 0.2 parts water-based pigment, 34 parts polar alcohol solvent, and 50 parts purified water. The upper layer comprises, by weight, the following components: 90 parts non-polar solvent, 4 parts non-polar fragrance, and 1.0 part oil-based pigment.

[0022] The polar fragrance is composed of rose essence and vanillin in a mass ratio of 3:2; The alcohol solvent is a mixture of anhydrous ethanol and isohexanediol in a mass ratio of 3:4; The dispersant is composed of PEG-7 and MPEG-200 mixed in a mass ratio of 1:1; The preservative is phenoxyethanol; The nonpolar solvent is white oil; The nonpolar flavoring is composed of d-limonene and myrcene in a mass ratio of 4:1; The aqueous pigment is hibiscus red; The oily pigment is corn yellow; The deodorizing agent is eucalyptus oil.

[0023] The stabilizer is prepared as follows: 1) Mix 3-mercapto-1,2-propanediol and pure ethanol, add AIBN and sonicate. Under a nitrogen atmosphere, slowly add n-hexylphenyl acrolein and stir at 400 r / min and 58 °C for 6 h. Centrifuge to remove the supernatant to obtain the intermediate. The ratio of n-hexylphenyl acrolein, 3-mercapto-1,2-propanediol, pure ethanol and AIBN is 8.2 g: 5.0 g: 60 mL: 0.20 g. 2) Under a nitrogen atmosphere, the intermediate and pure ethanol were mixed to form a mixture. The mixture was slowly added to the chitosan solution and treated at 60°C and 300W ultrasonic power for 3.5 hours. After cooling to room temperature, the solvent was removed by rotary evaporation. The mixture was washed three times with anhydrous ethanol and dried under vacuum at 60°C to constant weight to obtain the stabilizer. The ratio of the intermediate, pure ethanol and chitosan solution was 6.0g:45mL:50mL. The chitosan solution was prepared by mixing chitosan and 2wt% acetic acid aqueous solution at a ratio of 2.8g:50mL.

[0024] A method for preparing a secondary burst perfume fragrance with extended fragrance duration includes the following steps: Weigh the raw materials of the upper layer according to the weight proportions and mix them evenly. Weigh the raw materials of the lower layer according to the weight proportions and mix them evenly. Pour the lower layer material and the upper layer material into the bottle at a volume ratio of and let it stand for 2.0 hours to obtain the final product. Example 2

[0025] A second-layer fragrance with extended scent retention includes an upper layer and a lower layer, wherein the volume ratio of the upper layer to the lower layer is 6:4. The lower layer comprises, by weight, the following components: 5.1 parts polar fragrance, 1 part stabilizer, 1.2 parts dispersant, 0.25 parts preservative, 0.45 parts deodorizer, 0.25 parts water-based pigment, 36 parts polar alcohol solvent, and 55 parts purified water. The upper layer comprises, by weight, the following components: 92 parts non-polar solvent, 4.2 parts non-polar fragrance, and 1.2 parts oil-based pigment.

[0026] The polar fragrance is composed of rose essence and vanillin in a mass ratio of 3:2; The alcohol solvent is a mixture of anhydrous ethanol and isohexanediol in a mass ratio of 3:4; The dispersant is composed of PEG-7 and MPEG-200 mixed in a mass ratio of 1:1; The preservative is phenoxyethanol; The nonpolar solvent is white oil; The nonpolar flavoring is composed of d-limonene and myrcene in a mass ratio of 4:1; The aqueous pigment is hibiscus red; The oily pigment is corn yellow; The deodorizing agent is eucalyptus oil.

[0027] The stabilizer is prepared as follows: 1) Mix 3-mercapto-1,2-propanediol and pure ethanol, add AIBN and sonicate. Under a nitrogen atmosphere, slowly add n-hexylphenyl acrolein and stir at 500 r / min and 62℃ for 5.5 h. Centrifuge to remove the supernatant to obtain the intermediate. The ratio of n-hexylphenyl acrolein, 3-mercapto-1,2-propanediol, pure ethanol and AIBN is 8.6 g: 5.2 g: 65 mL: 0.21 g. 2) Under a nitrogen atmosphere, the intermediate and pure ethanol were mixed to form a mixture. The mixture was slowly added to the chitosan solution and treated at 62°C with 300W ultrasonic power for 3.2 hours. After cooling to room temperature, the solvent was removed by rotary evaporation. The mixture was washed four times with anhydrous ethanol and dried under vacuum at 60°C to constant weight to obtain the stabilizer. The ratio of the intermediate, pure ethanol and chitosan solution was 6.2g:48mL:52mL. The chitosan solution was prepared by mixing chitosan and 2wt% acetic acid aqueous solution at a ratio of 2.9g:52mL.

[0028] A method for preparing a secondary burst perfume fragrance with extended fragrance duration includes the following steps: Weigh the raw materials of the upper layer according to the specified weight parts and mix them evenly. Weigh the raw materials of the lower layer according to the specified weight parts and mix them evenly. Pour the lower layer material and the upper layer material into the bottle at a volume ratio of and let it stand for 2.2 hours to obtain the final product. Example 3

[0029] A second-layer fragrance with extended scent retention includes an upper layer and a lower layer, wherein the volume ratio of the upper layer to the lower layer is 6:4. The lower layer comprises, by weight, the following components: 5.4 parts polar fragrance, 1.2 parts stabilizer, 1.3 parts dispersant, 0.3 parts preservative, 0.5 parts deodorizer, 0.3 parts water-based pigment, 38 parts polar alcohol solvent, and 60 parts purified water. The upper layer comprises, by weight, the following components: 95 parts non-polar solvent, 4.5 parts non-polar fragrance, and 1.5 parts oil-based pigment.

[0030] The polar fragrance is composed of rose essence and vanillin in a mass ratio of 3:2; The alcohol solvent is a mixture of anhydrous ethanol and isohexanediol in a mass ratio of 3:4; The dispersant is composed of PEG-7 and MPEG-200 mixed in a mass ratio of 1:1; The preservative is phenoxyethanol; The nonpolar solvent is white oil; The nonpolar flavoring is composed of d-limonene and myrcene in a mass ratio of 4:1; The aqueous pigment is hibiscus red; The oily pigment is corn yellow; The deodorizing agent is eucalyptus oil.

[0031] The stabilizer is prepared as follows: 1) Mix 3-mercapto-1,2-propanediol and pure ethanol, add AIBN and sonicate. Under a nitrogen atmosphere, slowly add n-hexylphenyl acrolein and stir at 600 r / min and 65℃ for 5 h. Centrifuge to remove the supernatant to obtain the intermediate. The ratio of n-hexylphenyl acrolein, 3-mercapto-1,2-propanediol, pure ethanol and AIBN is 9.0 g: 5.5 g: 70 mL: 0.22 g. 2) Under a nitrogen atmosphere, the intermediate and pure ethanol were mixed to form a mixture. The mixture was slowly added to the chitosan solution and treated at 65°C with 300W ultrasonic power for 3.0h. After cooling to room temperature, the solvent was removed by rotary evaporation. The mixture was washed four times with anhydrous ethanol and dried under vacuum at 60°C to constant weight to obtain the stabilizer. The ratio of the intermediate, pure ethanol and chitosan solution was 6.5g:50mL:55mL. The chitosan solution was prepared by mixing chitosan and 2wt% acetic acid aqueous solution at a ratio of 3.0g:55mL.

[0032] A method for preparing a secondary burst perfume fragrance with extended fragrance duration includes the following steps: Weigh out the raw materials of the upper layer according to the weight proportions and mix them evenly. Weigh out the raw materials of the lower layer according to the weight proportions and mix them evenly. Pour the lower layer material and the upper layer material into the bottle at a volume ratio of and let it stand for 2.5 hours to obtain the final product.

[0033] Comparative Example 1 Compared with Example 3, Comparative Example 1 differs in that step 1 is omitted, and n-hexylphenyl acrolein is used instead of the intermediate; otherwise, they are identical.

[0034] Comparative Example 2 Compared with Example 3, Comparative Example 2 differs in that step 1 is omitted, and 3-mercapto-1,2-propanediol is used instead of the intermediate; otherwise, they are identical.

[0035] Comparative Example 3 Compared with Example 3, Comparative Example 3 differs in that step 2 is not performed, while the rest are the same.

[0036] Comparative Example 4 Compared with Example 3, Comparative Example 4 differs in that anhydrous ethanol is used instead of a stabilizer, otherwise they are the same.

[0037] The fragrances prepared in Examples 1-3 and Comparative Examples 1-4 were tested as follows; Aroma-related properties: According to GB / T22366-2008 Fragrances, the test results are shown in Table 1.

[0038]

[0039] As can be seen from the test results in Table 1, compared with Comparative Examples 1-4, the fragrance prepared by the present invention has a long-lasting fragrance release effect.

[0040] This invention utilizes the chemical bonding between the carbon-carbon double bond of hexylphenyl acrolein and the thiol group of 3-mercapto-1,2-propanediol to generate an intermediate containing multiple hydroxyl and thiol groups. Then, through the condensation reaction of its aldehyde group with chitosan amino groups, a Schiff base stabilizer containing imine groups is formed. The intermediate's molecular structure has an amphiphilic structure composed of hydroxyl, thiol, and imine polar groups and a hydrophobic segment of hexyl. This structure is compatible with the underlying polar system through the principle of polarity like dissolves, and also stabilizes with polar fragrances through the dual action of hydrogen bonding and hydrophobicity, thus delaying the volatilization of the fragrance.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A secondary burst fragrance with extended lasting scent, characterized in that, The product comprises an upper layer and a lower layer, wherein the volume ratio of the upper layer to the lower layer is 5-7:3-5. The lower layer comprises, by weight, the following components: 4.8-5.4 parts of polar fragrance, 0.9-1.2 parts of stabilizer, 1.1-1.3 parts of dispersant, 0.2-0.3 parts of preservative, 0.4-0.5 parts of deodorizer, 0.2-0.3 parts of water-based pigment, 34-38 parts of polar alcohol solvent, and 50-60 parts of purified water. The upper layer comprises, by weight, the following components: 90-95 parts of non-polar solvent, 4-4.5 parts of non-polar fragrance, and 1.0-1.5 parts of oil-based pigment.

2. The secondary burst fragrance with extended fragrance lifespan according to claim 1, characterized in that: The polar fragrance is one or more of geraniol, phenylethyl alcohol, vanillin, benzaldehyde, hexanal, and rose fragrance.

3. The secondary burst fragrance with extended fragrance lifespan according to claim 1, characterized in that: The polar alcohol solvent is one or more of anhydrous ethanol, isohexanediol, 1,2-propanediol, butanediol, ethylene glycol, and glycerol.

4. The secondary burst fragrance with extended fragrance duration according to claim 1, characterized in that: The dispersant is a mixture of PEG-7 and MPEG-200 in a mass ratio of 1:1, and the preservative is one or both of phenoxyethanol and ethylparaben.

5. A secondary burst fragrance with extended scent duration according to claim 1, characterized in that: The nonpolar solvent is one or more of liquid paraffin, white oil, hydrocarbon solvents, and vegetable oils.

6. A secondary burst fragrance with extended fragrance duration according to claim 1, characterized in that: The nonpolar fragrance is one or more of d-limonene, L-limonene, pinene, myrcene, caryophyllene, walnut aldehyde, coumarin, and cedrol.

7. A secondary burst perfume fragrance with extended fragrance duration according to claim 1, characterized in that, The stabilizer is prepared as follows: 1) Mix 3-mercapto-1,2-propanediol and pure ethanol, add an initiator and sonicate. Under an inert gas atmosphere, slowly add n-hexylphenyl acrolein and stir continuously at a constant temperature. Centrifuge to remove the supernatant to obtain the intermediate. 2) Under an inert gas atmosphere, the intermediate and pure ethanol are mixed to form a mixture. The mixture is slowly added to the chitosan solution and stirred and sonicated. After cooling, the solvent is removed by rotary evaporation, washed, and vacuum dried to obtain the stabilizer.

8. A secondary burst perfume fragrance with extended fragrance duration according to claim 7, characterized in that: In step 1), the stirring speed is 400-600 r / min, the temperature is 58-65℃, and the stirring time is 5-6 h. The ratio of n-hexylphenyl acrolein, 3-mercapto-1,2-propanediol, pure ethanol and initiator is 8.2-9.0 g: 5.0-5.5 g: 60-70 mL: 0.20-0.22 g.

9. A secondary burst fragrance with extended fragrance duration according to claim 7, characterized in that: In step 2), the stirring and ultrasonic treatment is carried out at a temperature of 60-65℃, an ultrasonic power of 300W, and a time of 3.0-3.5h. The ratio of the intermediate, pure ethanol, and chitosan solution is 6.0-6.5g:45-50mL:50-55mL. The chitosan solution is prepared by mixing chitosan and a 2wt% acetic acid aqueous solution at a ratio of 2.8-3.0g:50-55mL.

10. A method for preparing a secondary burst perfume fragrance with extended fragrance duration as described in any one of claims 1 to 9, characterized in that, The preparation method includes the following steps: Weigh the raw materials of the upper layer according to the weight proportions and mix them evenly. Weigh the raw materials of the lower layer according to the weight proportions and mix them evenly. Pour the lower layer material and the upper layer material into the bottle at a volume ratio of and let it stand for 2.0-2.5 hours to obtain the final product.

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