A fragrance formulation comprising a mixture of various essential oils

Abstract

This invention relates to the field of fragrance material preparation technology, and discloses a fragrance formulation of a mixture of multiple essential oils, comprising the following raw materials in parts by weight: 90-100 parts of mixed base essential oil, 8-12 parts of epoxy modifier, 3-5 parts of cationic surfactant, 6-10 parts of cyclodextrin inclusion agent, 0.5-1.0 parts of thickening and associating agent, 0.3-0.5 parts of organic acid catalyst, and 30-40 parts of deionized water; wherein the mixed base essential oil is obtained by activating a compound plant essential oil with a weakly acidic catalyst. By chemically modifying the essential oils to introduce binding groups suitable for cotton fibers, and combining them with fixative modification components to form a synergistic system, the problems of poor adhesion, easy volatility, and short-lasting fragrance of conventional essential oil fragrances to cotton fibers are solved. At the same time, no additional fixing agents and crosslinking agents are needed, preserving the skin-friendly properties of cotton fabrics.

Description

Technical Field

[0001] This invention relates to the field of fragrance material preparation technology, specifically to a fragrance formulation that mixes multiple essential oils. Background Technology

[0002] Essential oil fragrances are widely used in the field of cotton fabric fragrance due to their natural aroma properties. Cotton fiber, as a natural cellulose fiber, is skin-friendly but has a smooth surface and limited polar site binding capacity. Conventional essential oil fragrances are prepared by simple physical compounding, and their binding with cotton fiber is only weak physical adsorption, resulting in problems such as short fragrance retention time, easy volatility, and rapid loss of fragrance after slight friction or placement.

[0003] Currently, the preparation of essential oil fragrances for cotton fabrics is mostly based on simple physical compounding, which simply mixes different fragrance essential oils in proportion without modifying the structure of the essential oil molecules or designing molecular binding sites that are compatible with cotton fibers, resulting in poor adhesion between the fragrance and cotton fibers. Some solutions improve adhesion by adding external fixatives, crosslinking agents or using finishing processes such as padding and baking, but these methods require additional production steps, and fixatives may affect the skin-friendliness of cotton fabrics, while the use of crosslinking agents may cause the fabric to become stiff and have a poor hand feel.

[0004] Meanwhile, the terpenoid components in natural essential oils are highly volatile, and simple compounding cannot reduce their evaporation rate. The top notes of the fragrance dissipate quickly, and the release of the middle and base notes lacks sustained-release properties, making it difficult to achieve a long-lasting and stable release of fragrance on cotton fabrics. Based on this, this application provides a fragrance formulation that blends multiple essential oils. This formulation achieves a high-adhesion, long-lasting fragrance composition for cotton fibers solely through molecular modification of the fragrances themselves and composition optimization, without relying on external finishing processes and without affecting the original properties of the cotton fabric. Summary of the Invention

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a fragrance formulation that blends multiple essential oils. This invention provides a high-adhesion, long-lasting essential oil fragrance composition for cotton fibers. By chemically modifying the essential oils to introduce binding groups suitable for cotton fibers, and combining them with fragrance-fixing and modifying components to form a synergistic system, this invention solves the problems of poor adhesion, easy volatility, and short fragrance retention of conventional essential oil fragrances to cotton fibers. At the same time, it eliminates the need for additional fixatives and crosslinking agents, thus preserving the skin-friendly properties of cotton fabrics.

[0006] Technical solution To achieve the above objectives, the present invention provides the following technical solution: A fragrance formula that blends multiple essential oils, comprising the following ingredients in parts by weight: The mixture consists of 90-100 parts of base essential oil, 8-12 parts of epoxy modifier, 3-5 parts of cationic surfactant, 6-10 parts of cyclodextrin inclusion agent, 0.5-1.0 parts of thickening and associating agent, 0.3-0.5 parts of organic acid catalyst, and 30-40 parts of deionized water. The mixed base essential oil is obtained by activating compound plant essential oils with a weakly acidic catalyst.

[0007] Furthermore, the blended base essential oil is specifically prepared by the following steps: Mix the compound plant essential oils at 25-30℃ and 100-150 rpm for 20-30 minutes. Heat the mixture to 35-40℃ and add 0.1%-0.2% (by weight of the compound plant essential oils) of a weakly acidic catalyst. Stir at a constant temperature of 60-80 rpm for 15-20 minutes. After stirring, add anhydrous sodium carbonate to neutralize the pH of the system to 6.8-7.2. Filter the mixture through a 0.45μm filter membrane to obtain the mixed base essential oil.

[0008] Furthermore, the compound plant essential oil is composed of the following raw materials in parts by weight: 30-40 parts sweet orange oil, 15-20 parts mandarin orange oil, 15-20 parts lavender oil, 15-20 parts cypress oil, and 15-20 parts geranium oil.

[0009] Furthermore, the weakly acidic catalyst is obtained by mixing citric acid, malic acid and lactic acid in a mass ratio of (3-5):(2-4):(2-4).

[0010] Furthermore, the method for preparing the weakly acidic catalyst is as follows: Use a 70%-80% food-grade stock solution of lactic acid, and food-grade powders of citric acid and malic acid. First, dissolve the citric acid and malic acid in the lactic acid stock solution according to the ratio, and stir until completely dissolved. Then, add it directly to the essential oil that has been preheated to 35-40℃.

[0011] In the above technical solutions, citric acid, as a tribasic weak acid, has a mild acidity and a moderate concentration of hydrogen ions released from its dissociation. It has a good activation effect on both hydroxyl and olefin groups, and its catalytic activity is the strongest among the three organic acids. In particular, it has the highest activation efficiency for limonene in sweet orange oil and mandarin orange oil, and linalool in lavender oil. It can rapidly increase the addition reaction rate of these groups with subsequent epoxy modifiers without over-activating them and causing decomposition of essential oil components. Malic acid is milder than citric acid and contains bifunctional groups of hydroxyl and carboxyl groups. It has excellent structural compatibility with terpenoid alcohols and aromatic alcohols in essential oils. During catalysis, it can form weak hydrogen bonds with essential oil molecules, acting only on the active groups without affecting the aroma components. Cedarene in cypress oil and geraniol in geranium oil are sensitive to stronger catalytic environments. The mild acidity of malic acid can prevent their over-activation, and its bifunctional structure can improve the binding stability of these two essential oils with epoxy modifiers. Lactic acid has slightly weaker catalytic activity, but its lipophilic structure makes it highly compatible with natural essential oils. This can improve the dispersibility of the mixed catalyst in the essential oil system and prevent local overactivation caused by excessively high local concentrations of citric acid and malic acid powders in the essential oil. At the same time, the lipophilicity of lactic acid can slightly encapsulate the volatile light components of citrus essential oils, forming a synergy with the subsequent slow-release pretreatment of light components, thus balancing activation and top note protection.

[0012] Furthermore, the epoxy modifier is epoxidized soybean oil.

[0013] In the above technical solution, epoxidized soybean oil, as an epoxy modifier, can undergo a mild addition reaction with terpenes in the mixed base essential oils, introducing epoxy and hydroxyl polar groups.

[0014] Further, the cationic surfactant is at least one of bis(hydroxyethyl)dimethylammonium chloride, hexamethylenediamine bis(hydroxyethyl)dimethylammonium chloride, hydroxyethyltrimethylammonium chloride, dihydroxyethylmethylammonium chloride, methyltrihydroxyethylammonium chloride, and alkyl glycoside hydroxyethyldimethylammonium chloride.

[0015] Furthermore, the cyclodextrin inclusion agent is β-cyclodextrin.

[0016] In the above technical solution, β-cyclodextrin is selected as a cyclodextrin inclusion agent. It has good water solubility and can form inclusion complexes with essential oil molecules in the system, thereby reducing the evaporation rate of essential oils and achieving sustained release of aroma.

[0017] Furthermore, the thickening and associating agent is cationic hydroxyethyl cellulose.

[0018] Among them, cellulose materials with a viscosity of 10,000-20,000 mPa·s are selected, which can form a weak self-associative network structure with the cationic essential oil system, thereby improving the stability of the fragrance system and its binding force with cotton fibers.

[0019] Furthermore, the organic acid catalyst is citric acid and / or lactic acid.

[0020] In the above technical solution, the selected organic acid catalyst is a food-grade weak acid that catalyzes the addition reaction between the epoxy modifier and the mixed base essential oils without affecting the aroma of the fragrance.

[0021] Furthermore, the fragrance blend of multiple essential oils is specifically prepared by the following steps: S1. Heat the mixed base essential oil to 45-50℃, add the epoxy modifier and organic acid catalyst in the formula weight parts, keep warm and stir at 80-120rpm for 60-90min to obtain the epoxy modified essential oil system. S2. Cool the epoxy-modified essential oil system to 35-40℃, add the cationic surfactant in the formula mass fraction, keep warm and stir at 80-100 rpm for 40-60 min to allow the cationic end groups to combine with the modified essential oil molecules to obtain the cationic essential oil system. S3. Dissolve the cyclodextrin inclusion agent of the formula weight in 30-40 parts of deionized water, stir at 30-35℃ until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the cationic essential oil system dropwise into it, and simultaneously shear at high speed of 2000-3000 rpm for 15-20 min, then keep warm at 30-35℃ for 2 h to obtain the essential oil-cyclodextrin inclusion system; S4. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir at 100-150 rpm until completely dissolved, the system is in a low viscosity weak gel state, cool to room temperature, and then seal and mature at 25°C for 12 hours to obtain a fragrance mixed with multiple essential oils.

[0022] Beneficial technical effects This cotton fiber blended essential oil fragrance formula and its preparation method are specially customized based on the molecular characteristics of cotton fiber and the properties of natural essential oils. This formula allows the fragrance to adhere firmly to the cotton fiber, preventing it from easily falling off, and not only providing excellent abrasion resistance but also ensuring a long-lasting scent. This formula uses a compounded weakly acidic catalyst to gently activate the complex plant essential oils. This helps the effective groups in the essential oils to function better while preserving the original pure fragrance of the essential oils, allowing them to retain their natural and complex aroma.

[0023] This invention employs two combined modification methods: epoxy modification and cationic anchoring. These methods introduce binding sites to the essential oil molecules that are compatible with cotton fibers. This results in not only hydrogen bonding adsorption but also electrostatic adsorption, unlike traditional fragrances which rely solely on physical adhesion, fundamentally enhancing the adhesion effect. Furthermore, a sizing method combining cyclodextrin inclusion and cationic hydroxyethyl cellulose thickening is used. On the one hand, this allows for slow fragrance release; on the other hand, it stabilizes the overall fragrance structure, preventing layering and crystallization problems, making it more stable for both storage and use. The entire preparation process uses mild reaction conditions, and the selected raw materials have good compatibility with cotton fibers. It effectively modifies the fragrance to improve its performance without compromising the original softness and skin-friendly properties of cotton fabrics, and has no side effects. Moreover, the formulation and process parameters allow for reasonable adjustment, so there is no need to worry even if errors occur. This formulation is suitable for large-scale industrial production, with smooth transitions between steps and simple operation, making it highly valuable for mass production. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 A fragrance formula that blends multiple essential oils, specifically comprising the following ingredients by weight: The mixture consists of 90 parts of base essential oil, 8 parts of epoxy modifier, 3 parts of cationic surfactant, 6 parts of cyclodextrin inclusion agent, 0.5 parts of thickening and associating agent, 0.3 parts of organic acid catalyst, and 30-40 parts of deionized water. Among them, the epoxy modifier is epoxidized soybean oil with an epoxy value of 0.50 mol / 100g; the cationic surfactant is bis(hydroxyethyl)dimethylammonium chloride; the cyclodextrin inclusion agent is β-cyclodextrin; the thickening and associating agent is cationic hydroxyethyl cellulose with a viscosity of 15000 mPa·s; and the organic acid catalyst is citric acid. The blended base essential oil is prepared by the following steps: The compound plant essential oils were stirred at 100 rpm for 20 minutes at 25°C, then heated to 35°C. 0.1% (by weight) of a weakly acidic catalyst was added, and the mixture was stirred at 60 rpm for 15 minutes. After stirring, anhydrous sodium carbonate was added to neutralize the pH to 7. The mixture was then filtered through a 0.45 μm membrane to obtain the mixed base essential oil. The compound plant essential oils consisted of the following components by weight: 30 parts sweet orange oil, 15 parts mandarin orange oil, 15 parts lavender oil, 15 parts cypress oil, and 15 parts geranium oil. The weakly acidic catalyst was prepared by mixing citric acid, malic acid, and lactic acid in a 3:2:2 mass ratio. The specific preparation method is as follows: The lactic acid used is a 70% food-grade stock solution, while the citric acid and malic acid are food-grade powders. First, dissolve the citric acid and malic acid in the lactic acid stock solution according to the ratio, and stir until completely dissolved. Then, add it directly to the essential oil that has been preheated to 35°C.

[0026] A fragrance blend of multiple essential oils is prepared by the following steps: S1. Heat the mixed base essential oil to 45°C, add the epoxy modifier and organic acid catalyst in the formula weight parts, keep warm and stir at 80 rpm for 60 min to obtain the epoxy modified essential oil system. S2. Cool the epoxy-modified essential oil system to 35°C, add the cationic surfactant in the formula mass fraction, keep warm and stir at 80 rpm for 40 min to obtain the cationic essential oil system. S3. Dissolve the cyclodextrin inclusion agent of the formula weight in 30 parts of deionized water, stir at 30°C until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the cationic essential oil system dropwise into it, and simultaneously shear at 2000 rpm for 15 min, then keep at 30°C and stir at 50 rpm for 2 h to obtain the essential oil-cyclodextrin inclusion system. S4. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir at 100 rpm until completely dissolved, cool to room temperature, and then seal and mature at 25°C for 12 hours to obtain a fragrance mixed with multiple essential oils.

[0027] Example 2 A fragrance formula that blends multiple essential oils, specifically comprising the following ingredients by weight: The mixture consists of 95 parts of base essential oil, 10 parts of epoxy modifier, 4 parts of cationic surfactant, 8 parts of cyclodextrin inclusion agent, 0.8 parts of thickening and associating agent, 0.4 parts of organic acid catalyst, and 35 parts of deionized water. Among them, the epoxy modifier is epoxidized soybean oil with an epoxy value of 0.50 mol / 100g; the cationic surfactant is bis(hydroxyethyl)dimethylammonium chloride; the cyclodextrin inclusion agent is β-cyclodextrin; the thickening and associating agent is cationic hydroxyethyl cellulose with a viscosity of 15000 mPa·s; and the organic acid catalyst is citric acid. The blended base essential oil is prepared by the following steps: The compound plant essential oils were stirred at 100 rpm for 20 minutes at 25°C, then heated to 35°C. 0.1% (by weight) of a weakly acidic catalyst was added, and the mixture was stirred at a constant temperature of 60 rpm for 15 minutes. After stirring, anhydrous sodium carbonate was added to neutralize the pH to 7. The mixture was then filtered through a 0.45 μm filter membrane to obtain the mixed base essential oil. The compound plant essential oils consisted of the following components by weight: 35 parts sweet orange oil, 18 parts mandarin orange oil, 17 parts lavender oil, 18 parts cypress oil, and 17 parts geranium oil. The weakly acidic catalyst was prepared by mixing citric acid, malic acid, and lactic acid in a 5:3:3 mass ratio. The specific preparation method is as follows: The lactic acid used is a food-grade stock solution with a concentration of 80%, while the citric acid and malic acid are food-grade powders. First, dissolve the citric acid and malic acid in the lactic acid stock solution according to the ratio, and stir until completely dissolved. Then, add it directly to the essential oil that has been preheated to 40°C.

[0028] A fragrance blend of multiple essential oils is prepared by the following steps: S1. Heat the mixed base essential oil to 50°C, add the epoxy modifier and organic acid catalyst in the formula mass fraction, keep warm and stir at 120 rpm for 90 min to obtain the epoxy modified essential oil system. S2. Cool the epoxy-modified essential oil system to 40°C, add the cationic surfactant in the formula mass fraction, keep warm and stir at 100 rpm for 50 min to obtain the cationic essential oil system. S3. Dissolve the cyclodextrin inclusion agent of the formula weight in 35 parts of deionized water, stir at 35℃ until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the cationic essential oil system dropwise into it, and simultaneously shear at 2000 rpm for 20 min, then keep at 35℃ and stir at 50 rpm for 2 h to obtain the essential oil-cyclodextrin inclusion system. S4. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir at 150 rpm until completely dissolved, cool to room temperature, and then seal and mature at 25°C for 12 hours to obtain a fragrance mixed with multiple essential oils.

[0029] Example 3 A fragrance formula that blends multiple essential oils, specifically comprising the following ingredients by weight: The mixture consists of 100 parts of base essential oil, 12 parts of epoxy modifier, 5 parts of cationic surfactant, 10 parts of cyclodextrin inclusion agent, 1.0 part of thickening and associating agent, 0.5 parts of organic acid catalyst, and 40 parts of deionized water. Among them, the epoxy modifier is epoxidized soybean oil with an epoxy value of 0.50 mol / 100g; the cationic surfactant is bis(hydroxyethyl)dimethylammonium chloride; the cyclodextrin inclusion agent is β-cyclodextrin; the thickening and associating agent is cationic hydroxyethyl cellulose with a viscosity of 15000 mPa·s; and the organic acid catalyst is citric acid. The blended base essential oil is prepared by the following steps: The compound plant essential oils were stirred at 150 rpm for 30 minutes at 30°C, then heated to 40°C. A weakly acidic catalyst (0.2% by weight of the compound plant essential oils) was added, and the mixture was stirred at a constant temperature of 80 rpm for 20 minutes. After stirring, anhydrous sodium carbonate was added to neutralize the pH of the system to 7. The mixture was then filtered through a 0.45 μm filter membrane to obtain the mixed base essential oil. The compound plant essential oil consisted of the following components by weight: 40 parts sweet orange oil, 20 parts mandarin orange oil, 20 parts lavender oil, 20 parts cypress oil, and 20 parts geranium oil. The weakly acidic catalyst was prepared by mixing citric acid, malic acid, and lactic acid in a 5:4:4 mass ratio. The specific preparation method is as follows: The lactic acid used is a food-grade stock solution with a concentration of 80%, while the citric acid and malic acid are food-grade powders. First, dissolve the citric acid and malic acid in the lactic acid stock solution according to the ratio, and stir until completely dissolved. Then, add it directly to the essential oil that has been preheated to 40°C.

[0030] A fragrance blend of multiple essential oils is prepared by the following steps: S1. Heat the mixed base essential oil to 50°C, add the epoxy modifier and organic acid catalyst in the formula mass fraction, keep warm and stir at 120 rpm for 90 min to obtain the epoxy modified essential oil system. S2. Cool the epoxy-modified essential oil system to 40°C, add the cationic surfactant in the formula mass fraction, keep warm and stir at 100 rpm for 60 min to obtain the cationic essential oil system. S3. Dissolve the cyclodextrin inclusion agent of the formula weight in 40 parts of deionized water, stir at 35°C until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the cationic essential oil system dropwise into it, and simultaneously shear at 3000 rpm for 20 min, then keep at 35°C and stir at 50 rpm for 2 h to obtain the essential oil-cyclodextrin inclusion system. S4. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir at 150 rpm until completely dissolved, cool to room temperature, and then seal and mature at 25°C for 12 hours to obtain a fragrance mixed with multiple essential oils.

[0031] Comparative Example 1 The difference between this comparative example and Example 2 is that in the step of mixing the base essential oils in this comparative example, citric acid is used instead of a weak acid catalyst. The method of use is to add it directly to the compound plant essential oil system, and the amount added remains unchanged, that is, 0.1% of the mass of the compound plant essential oil.

[0032] Comparative Example 2 The difference between this comparative example and Example 2 is that the S1 epoxy modification step in Example 2 is omitted. Instead, the prepared mixed base essential oil is directly heated to 40°C for subsequent cationic anchoring treatment, while the proportions of the remaining raw materials remain unchanged. Specifically, in this comparative example, a fragrance blend of multiple essential oils is prepared through the following steps: S1. Heat the mixed base essential oils to 40°C, add the cationic surfactant in the formula mass fraction, keep warm and stir at 100 rpm for 60 min to obtain the cationic essential oil system. S2. Dissolve the cyclodextrin inclusion agent of the formula weight in 40 parts of deionized water, stir at 35°C until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the cationic essential oil system dropwise into it, and simultaneously shear at 3000 rpm for 20 min, then keep at 35°C and stir at 50 rpm for 2 h to obtain the essential oil-cyclodextrin inclusion system. S3. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir at 150 rpm until completely dissolved, cool to room temperature, and then seal and mature at 25°C for 12 hours to obtain a fragrance mixed with multiple essential oils.

[0033] Comparative Example 3 The difference between this comparative example and Example 2 is that the S4 thickening and associative step in Example 2 is omitted, and only the cyclodextrin inclusion treatment is performed. That is, after the essential oil-cyclodextrin inclusion system obtained in Example 2 S3 is naturally cooled to room temperature, it is directly sealed and matured at 25°C for 12 hours to obtain the fragrance product; the remaining S1-S3 steps, raw material ratios, and process parameters are completely consistent with those in Example 2. Specifically, in this comparative example, a fragrance mixed with multiple essential oils is prepared by the following steps: S1. Heat the mixed base essential oil to 50°C, add the epoxy modifier and organic acid catalyst in the formula mass fraction, keep warm and stir at 120 rpm for 90 min to obtain the epoxy modified essential oil system. S2. Cool the epoxy-modified essential oil system to 40°C, keep it warm and stir at 100 rpm for 50 minutes; S3. Dissolve the cyclodextrin inclusion agent of the formula weight in 35 parts of deionized water, stir at 35°C until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the essential oil system obtained in step S2 dropwise into it, and simultaneously shear at 2000 rpm for 20 min, then keep at 35°C and stir at 50 rpm for 2 h to obtain the essential oil-cyclodextrin inclusion system; S4. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir at 150 rpm until completely dissolved, cool to room temperature, and then seal and mature at 25°C for 12 hours to obtain a fragrance mixed with multiple essential oils.

[0034] Comparative Example 4 The difference between this comparative example and Example 2 is that the mass ratio of each component in the compound plant essential oil in this comparative example is: 15 parts sweet orange oil, 15 parts mandarin orange oil, 30 parts lavender oil, 20 parts cypress oil, and 10 parts geranium oil, with a total mass of 90 parts. The activation of the remaining weakly acidic catalyst and subsequent processes remain completely unchanged.

[0035] The fragrance retention performance of the fragrances prepared in the examples and comparative examples was then tested. Pure cotton knitted fabric was used as the uniform test substrate (200 g / m², pretreated for degreasing and deodorizing, without added fragrance). All examples and comparative examples used the same spraying fragrance application method: the amount of fragrance was 2% of the fabric mass, the spray gun nozzle diameter was 0.8 mm, the spraying distance was 20 cm, and the fragrance was sprayed evenly in two coats. After spraying, the fragrance was allowed to air dry for 5 minutes and then placed in a standard constant temperature and humidity environment of 25°C and 50%RH for 2 hours before testing.

[0036] The specific testing method is as follows: 1. Fiber Adhesion Effect Test: The total content of limonene, linalool, cedrol, and geraniol on the fabric surface was determined by gas chromatography. An HP-5 capillary column (30m×0.32mm×0.25μm) was used, with the column temperature maintained at 60℃ for 5 min, then increased to 200℃ at a rate of 5℃ / min. The injection port temperature was set to 250℃, the flame ionization detector temperature was 280℃, and high-purity nitrogen was used as the carrier gas at a flow rate of 1.0 mL / min. The injection volume was 1 μL. The initial total content (C0) before friction was measured first. Then, a friction resistance tester was used to dry rub the fabric for 3 h under constant pressure of 5N and 50 times / min. The total residual content of characteristic components (C1) after friction was measured. The fiber adhesion effect of the samples was judged by testing the friction residue rate of fragrance on the fibers in different groups. Friction residue rate (%) = (C1 / C0)×100%.

[0037] 2. Aroma retention test: Gas chromatography (chromatographic parameters are the same as those for fiber adhesion test) was used to detect the total content of limonene, linalool, cedrene, and geraniol in the fragrance product and compared with the total content of the core components of the unprocessed compound plant essential oil; Aroma retention (%) = (total content of core components after processing / total content of core components after unprocessing) × 100%.

[0038] The specific test results are shown in Table 1 below: Table 1

[0039] In Table 1, the friction residue rates of the four control groups were all lower than those of the example groups, and different variables had different degrees of influence on these two indicators, proving that each design point had different importance for adhesion and aroma retention. Comparison among the comparative examples shows that changing the catalyst type had the greatest impact on aroma retention, eliminating the epoxy modification step had the greatest impact on friction residue rate, and eliminating thickening and association or changing the essential oil ratio had a negligible impact on both indicators.

[0040] 3. Scent Duration Test: Sensory evaluation method, with a unified standard for scoring aroma intensity (0 points = no fragrance, 1-3 points = light fragrance, 4-6 points = medium fragrance, 7-10 points = strong fragrance). Ten perfumers independently evaluated the fragrances at 10:00 AM and 4:00 PM each day. A fragrance intensity average of ≥1 was considered to be present, and a fragrance intensity average of <1 for two consecutive days was considered to have ended. The duration of the top notes (sweet orange oil + mandarin orange oil), middle notes (lavender oil + geranium oil), and base notes (cypress oil) was recorded separately. The top notes were fresh citrus, the middle notes were floral, and the base notes were woody. Each fragrance type was scored and recorded independently.

[0041] The test results are shown in Table 2 below: Table 2

[0042] In the examples, the retention times of the top, middle, and base notes of the samples showed a progressively increasing trend, and the three scents exhibited extremely uniform retention layers with a reasonable progression in duration. This indicates that the process design of this scheme can precisely control the slow release of different fragrance components. The volatilization rates of citrus top notes, floral middle notes, and woody base notes were all well controlled, and with gradient optimization, the sustained-release effect was even more significant. This demonstrates the compatibility of the formulation and process with different fragrance components.

[0043] The retention time of each fragrance in the control group was significantly shorter than that in the example group, and changes in different design points had varying effects on the retention of each fragrance, indicating that each design point indeed has a different effect on the sustained release of different fragrance components. Most notably, without the epoxy modification step, the retention of all fragrances was most significantly affected; changing the catalyst type had a more significant impact on the retention of top notes; and without the thickening and associating step, or by changing the essential oil ratio, the retention of middle and base notes was more significantly affected. This also confirms that each design point is consistent with the volatility and structural characteristics of different fragrances.

[0044] In both groups, the base fragrance lasted longer than the middle and top notes, and the middle fragrance lasted longer than the top notes, which aligns with the normal evaporation patterns of natural essential oils. Furthermore, the example group not only extended the lasting power of each fragrance but also maintained a reasonable fragrance profile. This indicates that the process design did not arbitrarily add substances to fix the aroma, but rather adjusted and optimized based on the original evaporation characteristics of the essential oils, thus improving both lasting power and preserving the fragrance's complexity, achieving a balance between the two.

[0045] 4. Cotton fabric hand feel change test: The manual touch comparison scoring method was used. Five testing engineers compared the scented fabric with the unscented pure cotton knitted fabric and scored them independently. The specific scoring criteria were as follows: 5 points = consistent with the original fabric, soft and skin-friendly, no stickiness / stiffness; 4 points = slightly sticky, no change in softness; 3 points = obviously sticky, slight decrease in softness; 2 points = stiff, severely sticky; 1 point = severely stiff, loss of skin-friendly properties.

[0046] 5. Fragrance stability test: The fragrance products obtained from different groups were placed in sealed transparent glass bottles and placed in a light-proof environment at 25°C. The appearance was observed on the 7th, 15th and 30th days. If the system was homogeneous throughout the process and there was no layering, crystallization, precipitation or demulsification, it was qualified.

[0047] The specific test results are shown in Table 3 below.

[0048] Table 3

[0049] As shown in Table 3, in all four sets of examples, the hand feel evaluation of the cotton fabrics was perfect, and the fragrance systems were all qualified. No set showed a deterioration in hand feel or instability in the fragrance system. This indicates that the selected excipients and determined process parameters are highly compatible with the skin-friendly characteristics of cotton fabrics and the stable properties of the fragrance system. Not only was the essential oil modified to ensure the fragrance is firmly retained, but the hand feel of the cotton fabric was not compromised, and the fragrance system structure was highly stable. Even with gradient optimization, the homogeneity of the system was not disrupted.

[0050] Observing the four control groups, only two groups showed a deterioration in the hand feel of the cotton fabric, and only one group had a substandard fragrance system. Specifically, changing the catalyst type and omitting the thickening and associating step both led to a deterioration in the fabric hand feel; only the absence of the thickening and associating step caused instability in the fragrance system; the absence of the epoxy modification step and changes in the essential oil ratio had no significant impact on the hand feel and system stability. This proves that the auxiliary materials and determined process operations at each design point were carefully selected, and only a few specific design points are directly related to the fabric's feel and the stability of its system structure.

[0051] Furthermore, the hand feel of cotton fabrics is not significantly correlated with the stability of the fragrance system. A worse hand feel does not necessarily indicate an unstable fragrance system; conversely, while an unstable fragrance system may also result in a worse hand feel, the influencing factors for these two issues are not entirely the same. This suggests that in this approach, the core factor affecting fabric hand feel is the auxiliary components that directly contact the fabric and their dispersion; the core factor affecting system stability is the fragrance setting process. Although the design concepts for these two aspects are independent, they are unified within the overall formulation system and ultimately matched with the core process.

[0052] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0054] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments.

Claims

1. A fragrance formula blending multiple essential oils, characterized in that, Includes the following quantities of raw materials: The mixture consists of 90-100 parts of base essential oil, 8-12 parts of epoxy modifier, 3-5 parts of cationic surfactant, 6-10 parts of cyclodextrin inclusion agent, 0.5-1.0 parts of thickening and associating agent, 0.3-0.5 parts of organic acid catalyst, and 30-40 parts of deionized water. The mixed base essential oil is obtained by activating compound plant essential oils with a weakly acidic catalyst.

2. The fragrance formula of mixing multiple essential oils according to claim 1, characterized in that, The blended base essential oil is prepared by the following steps: Mix the compound plant essential oils for 20-30 minutes, heat to 35-40℃, add a weak acid catalyst, and stir for 15-20 minutes. After stirring, neutralize the pH of the system to 6.8-7.2, filter, and obtain the mixed base essential oil.

3. The fragrance formula of mixing multiple essential oils according to claim 2, characterized in that, The compound plant essential oil is composed of the following raw materials in parts by weight: 30-40 parts sweet orange oil, 15-20 parts mandarin orange oil, 15-20 parts lavender oil, 15-20 parts cypress oil, and 15-20 parts geranium oil.

4. A fragrance formula containing multiple essential oils according to claim 2, characterized in that, The weakly acidic catalyst is obtained by mixing citric acid, malic acid and lactic acid in a mass ratio of (3-5):(2-4):(2-4).

5. A fragrance formulation of multiple essential oils according to claim 4, characterized in that, The preparation method of the weakly acidic catalyst is as follows: Use a 70%-80% food-grade stock solution of lactic acid, and food-grade powders of citric acid and malic acid. First, dissolve the citric acid and malic acid in the lactic acid stock solution according to the ratio, and stir until completely dissolved. Then, add it directly to the essential oil that has been preheated to 35-40℃.

6. A fragrance formula containing multiple essential oils according to claim 1, characterized in that, The cationic surfactant is at least one of bis(hydroxyethyl)dimethylammonium chloride, hexamethylenediamine bis(hydroxyethyl)dimethylammonium chloride, hydroxyethyltrimethylammonium chloride, dihydroxyethylmethylammonium chloride, methyltrihydroxyethylammonium chloride, and alkyl glycoside hydroxyethyldimethylammonium chloride.

7. A fragrance formula containing multiple essential oils as described in claim 1, characterized in that, The epoxy modifier is epoxidized soybean oil.

8. A fragrance formulation of multiple essential oils according to claim 1, characterized in that, The cyclodextrin inclusion agent is β-cyclodextrin.

9. A fragrance formula containing multiple essential oils according to claim 1, characterized in that, The thickening and associating agent is cationic hydroxyethyl cellulose.

10. A fragrance formulation of multiple essential oils according to claim 1, characterized in that, The fragrance, a mixture of multiple essential oils, is prepared by the following steps: S1. Heat the mixed base essential oils to 45-50℃, add the epoxy modifier and organic acid catalyst in the formula weight parts, keep warm and stir for 60-90 minutes to obtain the epoxy modified essential oil system. S2. Cool the epoxy-modified essential oil system to 35-40℃, add the cationic surfactant in the formula mass fraction, keep warm and stir for 40-60 minutes to obtain the cationic essential oil system. S3. Dissolve the cyclodextrin inclusion agent of the formula weight in 30-40 parts of deionized water, stir at 30-35℃ until completely dissolved to obtain a saturated aqueous solution of cyclodextrin, add the cationic essential oil system dropwise into it, and shear for 15-20 min at the same time, then keep warm at 30-35℃ to include it, and obtain the essential oil-cyclodextrin inclusion system. S4. Add the formula weight of thickening and associating agent to the essential oil-cyclodextrin inclusion system, stir until completely dissolved, the system is in a low viscosity weak gel state, cool to room temperature, and then seal and mature at 25°C to obtain a fragrance mixed with multiple essential oils.

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