Fabric fragrance-retaining material containing plant extract and preparation method of fabric fragrance-retaining material

Abstract

The invention relates to a fabric fragrance-retaining material containing plant extracts and a preparation method of the fabric fragrance-retaining material, and aims to solve the problems of quick washing loss of fragrance and poor long-term effect in a traditional fabric fragrance-retaining technology. According to the material, a plant extract is used as a core material to prepare hydrophilic and hydrophobic biphase microspheres, a water-temperature dual-response polyvinyl pyrrolidone-N-isopropylacrylamide copolymer is used as a shell, and washing fragrance locking and dry-state temperature-sensitive fragrance release are realized by regulating and controlling swelling and shrinkage of a hydrophilic / hydrophobic segment. The microspheres are stably combined with fibers through the modified guar gum targeted adsorption layer and do not interfere with response, the fragrance retention rate after 40 times of water washing is 80%-90%, the fragrance retention time at the normal temperature is 60-90 days, and the fabric keeps the original hand feeling and air permeability.

Description

Technical Field

[0001] This invention belongs to the field of textile functional materials technology, specifically relating to a fabric fragrance-retaining material containing plant extracts and its preparation method. Background Technology

[0002] This invention relates to the field of textile functional materials technology, specifically to a fabric fragrance-retaining material containing plant extracts, its preparation method, and its application. With the upgrading of consumption, consumers' demands for the functionality of fabrics are increasing. Fragrance-retaining fabrics, due to their ability to provide a continuous fragrance experience, are widely used in categories such as underwear, children's wear, and home textiles. However, existing fabric fragrance-retaining technologies have significant drawbacks: traditional fragrance-retaining materials mostly use a single coating structure, which can only achieve simple fragrance carrying capacity, lacking environmental responsiveness. The fragrance is easily lost during washing, and the fragrance retention rate is generally less than 70% after 40 washes, resulting in poor long-lasting effects. Some temperature-sensitive fragrance-retaining materials can achieve temperature-responsive fragrance release, but they do not solve the problem of fragrance loss during washing, and the response temperature does not match the human wearing scenario, leading to unstable fragrance release effects. At the same time, some materials, in pursuit of fragrance retention, excessively increase the coating layer thickness or add chemical binders, resulting in a stiff fabric feel, reduced breathability, and negatively impacting the wearing experience. Furthermore, the preparation processes of existing materials often suffer from unreasonable raw material ratios and weak bonding between microspheres and fabrics, further limiting their industrial application. Therefore, developing a fabric fragrance material that combines the characteristics of water-washable fragrance locking, temperature-sensitive fragrance release, and long-lasting fragrance retention without affecting the original feel and breathability of the fabric has become an urgent need in the field of textile functional materials. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a fabric fragrance-retaining material containing plant extracts, its preparation method, and its application. This material constructs a composite system of water-temperature dual-response hydrophilic and hydrophobic biphase microspheres and a modified guar gum targeted adsorption layer, achieving fragrance retention after washing and temperature-sensitive fragrance release in the dry state. It combines the characteristics of long-lasting fragrance retention after high-frequency washing and temperature-adaptive fragrance release, without altering the original feel and breathability of the fabric. The preparation process is compatible with existing textile production lines and can meet the application needs of high-frequency washed fabrics such as underwear, children's wear, and home textiles.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A fabric fragrance-retaining material containing plant extracts, the fragrance-retaining material comprising hydrophilic and hydrophobic biphasic microspheres and a fabric substrate, prepared from the following raw materials in parts by weight: Hydrophilic-hydrophobic biphase microspheres: 30-50 parts plant extract, 14-28 parts polyvinylpyrrolidone, 6-12 parts N-isopropylacrylamide, 0.5-2 parts initiator, 1-3 parts emulsifier, 50-80 parts hydrophobic dispersion medium, and 100-200 parts deionized water; the hydrophilic-hydrophobic biphase microspheres use plant extract as the core material and the shell is a water-temperature dual-responsive polyvinylpyrrolidone-N-isopropylacrylamide copolymer; The fabric substrate has a modified guar gum targeted adsorption layer on its fiber surface, and the hydrophilic and hydrophobic biphase microspheres are stably bonded to the fabric fibers through the targeted adsorption layer; the dual-response copolymer achieves water-wash fragrance locking and dry-state temperature-sensitive fragrance release through the swelling and shrinkage of the hydrophilic / hydrophobic segments.

[0005] Optionally, in the polyvinylpyrrolidone-N-isopropylacrylamide copolymer, the mass ratio of polyvinylpyrrolidone to N-isopropylacrylamide is 7:3-6:4, and the volume phase transition temperature of the copolymer is 28℃-30℃.

[0006] Optionally, the hydrophilic-hydrophobic biphase microspheres have a particle size of 3-8 μm, a core-to-wall mass ratio of 3:1-5:1, and a plant extract content of 60%-80% in the core material.

[0007] Optionally, the plant extract is selected from one or more of rose essential oil, lavender essential oil, tea tree essential oil, citrus essential oil, and jasmine essential oil; the initiator is one or more of ammonium persulfate, potassium persulfate, and azobisisobutyronitrile; the emulsifier is Tween-80, Span-60, or a combination of these emulsifiers; and the hydrophobic dispersion medium is polysiloxane or liquid paraffin.

[0008] Optionally, the thickness of the modified guar gum targeted adsorption layer is 50-100 nm, it is prepared using cationic modified guar gum, and its loading on the surface of the fabric fiber is 0.5% owf-2.0% owf.

[0009] Optionally, the fragrance retention rate of the fragrance material is 80%-90% after 40 standard water washes, and the fragrance retention time is 60-90 days at room temperature. The fragrance release rate at dry temperatures above 30°C is 30%-50% higher than that at temperatures below 25°C.

[0010] Optionally, the preparation method of the fabric fragrance material containing plant extracts is as follows: S1. Weigh the plant extract, polyvinylpyrrolidone, N-isopropylacrylamide, initiator, emulsifier, hydrophobic dispersion medium, and deionized water according to the following weight parts: Add the polyvinylpyrrolidone and N-isopropylacrylamide monomers to the deionized water, stir to dissolve, adjust the pH of the system to 5.5-6.5, heat to 50-55℃ and keep warm for 10-15 min to obtain the shell material prepolymer solution; Add the initiator to the shell material prepolymer solution, stir and disperse for 5-10 min, and slowly add the mixture of plant extract and hydrophobic dispersion medium at a rate of 0.5-1.0 mL / min, while adjusting the stirring speed to 300-500 rpm to form a stable emulsion; Heat to 60-65℃ and keep warm for 3-4 h for polymerization, cool to room temperature after the reaction is completed, centrifuge, wash, and vacuum dry at 50-60℃ for 2-3 h to obtain hydrophilic and hydrophobic biphase microspheres with a particle size of 3-8 μm; S2. Dissolve the modified guar gum in deionized water, stir to dissolve, and then add 0.1%-0.3% preservative to prepare an adsorption layer treatment solution with a mass concentration of 1%-3% and a pH value of 6.0-7.0. After the fabric substrate has been pretreated by degreasing and bleaching, it is immersed in the treatment solution at 40℃-50℃ with a bath ratio of 1:20-1:30 for 20-30 minutes. After two dips and two nips, it is dried at 80℃-90℃ for 15-20 minutes to obtain a fabric with a modified guar gum targeted adsorption layer on the surface. S3. Add deionized water to the biphasic microspheres and ultrasonically disperse them at 300-500W for 10-15 minutes to prepare a microsphere finishing solution with a mass concentration of 5%-10%. Add 0.2%-0.5% dispersant to adjust the stability. Immerse the fabric treated in step S2 into the finishing solution and soak it at 45-55℃ for 30-40 minutes with a liquor ratio of 1:20-1:30. After two dips and two nips, use a gradient drying process to dry the fabric sequentially at 60℃ for 10-15 minutes, 80℃ for 10-15 minutes, and 100℃ for 5-10 minutes. After natural cooling, the fabric fragrance material is obtained.

[0011] Optionally, in step S1, when the initiator is ammonium persulfate or potassium persulfate, the reaction system needs to be protected by nitrogen gas, and the nitrogen flow rate is 0.5-1.0 L / min; when the emulsifier is a mixture of Tween-80 and Span-60, the mass ratio of the two is 1:1-2:1.

[0012] Optionally, the material is suitable for cotton, linen, chemical fiber and blended fabrics, and can be applied to high-frequency washed fabrics such as underwear, children's clothing, home textiles and towels.

[0013] The beneficial effects of this invention are: The fabric fragrance material prepared by this invention exhibits excellent long-lasting fragrance retention, maintaining 80%-90% fragrance retention even after 40 standard washes, and lasting for 60-90 days at room temperature, thus solving the problem of rapid fragrance loss after washing with traditional materials. The material features a water-temperature dual-response structure, increasing the release rate of plant extracts at temperatures above 30℃ (dry state) by 30%-50% compared to below 25℃, achieving temperature-sensitive fragrance release suitable for human wearing environments. A modified guar gum targeted adsorption layer allows for stable bonding between the microspheres and fabric fibers without the addition of additional binders, fully preserving the original feel and breathability of the fabric and enhancing the wearing experience. Furthermore, the hydrophilic-hydrophobic biphase microsphere preparation process is controllable, the overall finishing process is compatible with existing textile production lines without requiring additional equipment, and the microsphere particle size and loading are precisely adjustable, indicating broad prospects for industrial application. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0015] Figure 1 This is a bar chart comparing the fragrance retention rates of different samples after 40 water washes according to the present invention. Figure 2 This is a bar chart comparing the room temperature fragrance retention time and the increase rate of temperature-sensitive fragrance release for different samples of the present invention. Detailed Implementation

[0016] 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 will be clearly and completely described below in conjunction with the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Example 1: This Example 1 describes a fabric fragrance-retaining material containing plant extracts. The fragrance-retaining material is prepared from the following raw materials in parts by weight: Hydrophilic-hydrophobic biphasic microspheres: Plant extracts: 30 parts rose essential oil, 14 parts polyvinylpyrrolidone (PVP), 6 parts N-isopropylacrylamide (NIPAM), initiator: 0.5 parts ammonium persulfate (APS), emulsifier: 1 part Tween-80, hydrophobic dispersion medium: 50 parts polysiloxane, 100 parts deionized water; This embodiment describes a method for preparing a fabric fragrance-retaining material containing plant extracts. The specific preparation steps are as follows: S1. PVP and NIPAM were added to deionized water and stirred at 220 rpm to dissolve. The pH of the system was adjusted to 5.5, and the temperature was raised to 50℃ and kept at 10 min to obtain the shell material prepolymer solution. APS was added to the shell material prepolymer solution and stirred at 220 rpm to disperse for 5 min. Then, a mixture of plant extract and hydrophobic dispersion medium was slowly added dropwise at a rate of 0.5 mL / min, while the stirring rate was adjusted to 300 rpm to form a stable emulsion. The temperature was raised to 60℃ and kept at 3 h for polymerization. After the reaction was completed, the mixture was cooled to room temperature, centrifuged, washed, and vacuum dried at 50℃ for 2 h to obtain hydrophilic and hydrophobic biphase microspheres with a particle size of 3 μm. S2. Dissolve 1 part of cationic modified guar gum in deionized water, stir at 220 rpm to dissolve, and then add 0.1% preservative to prepare an adsorption layer treatment solution with a mass concentration of 1% and pH 6.0. After degreasing and bleaching pretreatment, cotton fabric is immersed in the treatment solution (bath ratio 1:20) at 40°C for 20 min, followed by two dips and two nips (70% nips), and then dried at 80°C for 15 min to obtain a modified fabric with surface-loaded modified guar gum (loading amount 0.5% owf). S3. Take the hydrophilic-hydrophobic biphase microspheres prepared in step S1, add deionized water, and disperse them using an ultrasonic device with a power of 300W for 10 minutes. Then, stir at a speed of 220 rpm until the system is uniform to prepare a microsphere finishing solution with a mass concentration of 5%. Add 0.2% of sodium polycarboxylate dispersant to the finishing solution and stir to mix well. Immerse the fabric modified in step S2 into the above microsphere finishing solution, control the temperature of the finishing solution at 45℃ and the bath ratio at 1:20, and immerse for 30 minutes. Then, perform a two-dip and two-ply treatment on the fabric, control the ply rate at 75%, and then use a gradient drying process to dry the fabric, drying at 60℃ for 10 minutes, 80℃ for 10 minutes, and 100℃ for 5 minutes in sequence. After the fabric cools naturally, the target fabric fragrance material is obtained.

[0018] Example 2: This Example 2 describes a fabric fragrance-retaining material containing plant extracts. The fragrance-retaining material is prepared from the following raw materials in parts by weight: Hydrophilic-hydrophobic biphasic microspheres: Plant extracts: 40 parts rose essential oil, 14 parts PVP, 6 parts NIPAM, initiator: 0.5 parts APS, emulsifier: 1 part Tween-80, hydrophobic dispersion medium: 50 parts polysiloxane, 100 parts deionized water; In this embodiment, the preparation method of a fabric fragrance material containing plant extracts is the same as in Example 1, except that the amount of plant extracts is increased to 40 parts.

[0019] Example 3: This Example 3 describes a fabric fragrance-retaining material containing plant extracts. The fragrance-retaining material is prepared from the following raw materials in parts by weight: Hydrophilic-hydrophobic biphasic microspheres: Plant extracts: 50 parts rose essential oil, 14 parts PVP, 6 parts NIPAM, initiator: 0.5 parts APS, emulsifier: 1 part Tween-80, hydrophobic dispersion medium: 50 parts polysiloxane, 100 parts deionized water; In this embodiment, the preparation method of a fabric fragrance material containing plant extracts is the same as in Example 1, except that the amount of plant extracts is increased to 50 parts.

[0020] Comparative Example 1: The fragrance material of Comparative Example 1 was prepared from the following parts by weight of raw materials: Hydrophilic-hydrophobic biphasic microspheres: Plant extracts: 30 parts rose essential oil, 20 parts PVP, initiator: 0.5 parts APS, emulsifier: 1 part Tween-80, hydrophobic dispersion medium: 50 parts polysiloxane, 100 parts deionized water; The preparation method of the fragrance material in this comparative example is the same as that in Example 1, except that NIPAM is not added. PVP is added to deionized water, stirred at 220 rpm to dissolve, and the pH is adjusted to 5.5. The temperature is raised to 50°C and kept at 10 min to obtain the shell material liquid. APS is added and stirred at 220 rpm for 5 min. A mixture of plant extract and polysiloxane is added dropwise at 0.5 mL / min and stirred at 300 rpm to form an emulsion. The temperature is raised to 60°C to polymerize for 3 h. After cooling, the mixture is centrifuged, washed, and vacuum dried at 50°C for 2 h to obtain pure PVP-coated microspheres.

[0021] Comparative Example 2: The fragrance-retaining material of Comparative Example 2 was prepared from the following parts by weight of raw materials: Hydrophilic-hydrophobic biphasic microspheres: Plant extracts: 30 parts rose essential oil, 14 parts PVP, 6 parts NIPAM, initiator: 0.5 parts APS, emulsifier: 1 part Tween-80, hydrophobic dispersion medium: 50 parts polysiloxane, 100 parts deionized water; The preparation method of the fragrance-retaining material in this comparative example is the same as that in Example 1, except that cationic modified guar gum is not added, i.e., step S2 is omitted.

[0022] Performance testing 1. Fragrance retention rate after 40 washes Referring to washing procedure 5A in GB / T 8629-2017 "Home Washing and Drying Procedures for Textile Testing", and using static headspace-gas chromatography (GC) for quantitative determination, the fabric fragrance materials prepared in Examples 1-3 and Comparative Examples 1-2, as well as blank original cotton fabrics, were all cut into 10cm×10cm samples, with 3 parallel samples for each sample. The samples were placed in a fully automatic washing test machine, and 0.2% by mass of neutral detergent was added at a liquor ratio of 1:50. The washing temperature was set to 40℃, the washing time to 15min, and the dehydration time to 5min. One standard wash-dehydration cycle was performed, and this operation was repeated up to 40 times. The samples after 40 washes and the initial unwashed samples were dried to constant weight, cut into 2cm×2cm pieces, and placed in headspace vials. The samples were equilibrated at 60℃ for 30 minutes. The peak areas of the characteristic components (citronellol and geraniol) of rose essential oil in the headspace were detected by gas chromatography. The fragrance retention rate after 40 washes was calculated according to the formula "Fragrance retention rate after 40 washes = (Peak area of ​​characteristic components after 40 washes / Peak area of ​​initial unwashed characteristic components) × 100%". The average value of 3 parallel samples was taken as the final test result.

[0023] Table 1. Fragrance retention test data of different samples after 40 water washes

[0024] The fragrance retention rate of Examples 1-3 after 40 washes reached 80%-86%, and showed a clear gradient improvement trend with process optimization. Comparative Examples 1-2, lacking core fixation or thermosensitive encapsulation processes, had a fragrance retention rate of only 58%-65%, far lower than the Example groups. This result indicates that the present technical solution, through the synergistic effect of microsphere fixation and thermosensitive encapsulation, can effectively improve the binding strength between fragrance and fabric, significantly enhance the fabric's resistance to washing and fragrance retention, and solve the technical problems of easy fragrance loss and poor fragrance retention after washing in traditional fragrance-retaining fabrics.

[0025] 2. Fragrance lasting time at room temperature The fabric fragrance materials prepared in Examples 1-3 and Comparative Examples 1-2, as well as blank original cotton fabrics, were all cut into 2cm×2cm samples, with 3 parallel samples set for each sample. The samples were placed in sealed headspace vials and allowed to stand in a constant environment of 25℃±1℃ and 60%±5% relative humidity. Every 24 hours, the samples were taken out and kept at 60℃ for equilibration for 30 minutes. The peak areas of the characteristic components (citronellol and geraniol) of rose essential oil in the headspace were detected by gas chromatography. The peak areas of the characteristic components in the initial state before standing were used as the benchmark. When the peak areas of the detected characteristic components dropped to 10% of the initial peak areas, the corresponding standing time was recorded as the room temperature fragrance retention time of the sample. The final result was the average of the detection data of the 3 parallel samples.

[0026] Table 2. Test data on the fragrance retention time of different samples at room temperature

[0027] Examples 1-3 exhibited a room-temperature fragrance retention time of 60-80 days, achieving long-lasting fragrance retention on the fabric. Comparative Examples 1-2, due to process defects, only retained fragrance for 35-40 days, less than 60% of the examples, and the blank original cotton fabric showed no fragrance retention. These results demonstrate that this technology, through the combination of a fragrance slow-release structure design and efficient microsphere fixation, effectively slows down the natural release rate of the fragrance, significantly extending the fragrance retention period of the fabric during room-temperature storage and use, and enhancing the product's fragrance experience.

[0028] 3. Increase in temperature-sensitive aroma release rate The temperature-sensitive fragrance release rate enhancement rate was determined using static headspace-gas chromatography to verify the temperature-sensitive responsiveness by simulating the temperature gradient between ambient temperature and human body temperature. Fabric fragrance materials prepared in Examples 1-3 and Comparative Examples 1-2, as well as blank raw cotton fabrics, were all cut into 2cm × 2cm samples. Three parallel samples were prepared for each sample and placed in sealed headspace vials. One sample was kept at a constant temperature of 30℃ ± 1℃ (simulating ambient temperature), and the other at 37℃ ± 1℃ (simulating human body temperature) for 30 minutes to equilibrate. The peak areas of the characteristic components of rose essential oil (citronellol and geraniol) in the headspace of the two samples were detected using gas chromatography. The temperature-sensitive fragrance release rate enhancement rate was calculated using the formula: "Temperature-sensitive fragrance release rate enhancement rate = [(peak area of ​​characteristic component at 37℃ - peak area of ​​characteristic component at 30℃) / peak area of ​​characteristic component at 30℃] × 100%". The final result was the average of the three parallel sample detection data.

[0029] Table 3. Test data on the improvement rate of temperature-sensitive aroma release rate of different samples.

[0030] Examples 1-3 showed a 30%-40% increase in fragrance release rate at a human body temperature of 37°C, with a gradient increase following optimization of fragrance loading, achieving precise temperature-sensitive fragrance release triggered by human body temperature. Comparative Example 1, lacking a temperature-sensitive shell material, exhibited no temperature-responsive fragrance release rate, with an increase of approximately 0%. Comparative Example 2, while showing a temperature-sensitive effect, lacked a fixation process, resulting in a slightly higher increase rate but insufficient fragrance retention stability. These results demonstrate that the temperature-sensitive microcapsule structure design of this technology enables temperature-responsive fragrance release, balancing targeted fragrance release with practicality, meeting the application requirements of intelligent fragrance release in fabrics.

[0031] 4. Microsphere adhesion rate The microsphere fixation rate was determined using the ash gravimetric method. Referring to the ashing pretreatment procedure in GB / T 17593.4-2006 "Determination of Heavy Metals in Textiles Part 4: Arsenic and Mercury Atomic Fluorescence Spectrophotometry" and the constant weight / parallel sample control requirements in GB / T 2910.1-2009 "Quantitative Chemical Analysis of Textiles Part 1: General Test Rules," and considering the polysiloxane (high-temperature stable, with residual ash) characteristics of the microspheres in this invention, the fabric fragrance materials prepared in Examples 1-3 and Comparative Examples 1-2, as well as blank original cotton fabrics, were all cut into 5cm × 5cm samples. Three parallel samples were set up for each sample. They were first dried to constant weight in an oven at 105℃±2℃. The initial total mass (m0) of the sample and the initial mass (m1) of the blank cotton fabric were weighed and recorded using an analytical balance with an accuracy of 0.0001g. The sample and blank fabric were then placed in pre-weighed porcelain containers. Place a muffle furnace in the crucible and heat it to 600℃±10℃ at a rate of 5℃ / min. After ashing at a constant temperature for 2 hours, allow it to cool naturally to room temperature (place it in a desiccator to avoid moisture absorption). Weigh and record the total mass (m2) of the sample after ashing and the mass (m3) of the blank cotton fabric after ashing. Calculate the microsphere adhesion rate using the formula "microsphere adhesion rate = [(m2-m3) / (m0-m1)]×100%", where (m0-m1) is the initial mass of the microspheres attached and (m2-m3) is the mass of the microspheres remaining after ashing. The final result is the average of the test data from 3 parallel samples. At the same time, record the relative humidity of the test environment as 60%±5% to ensure data repeatability.

[0032] Table 4. Test data on the adhesion rate of microspheres in different samples.

[0033] The microsphere fixation rate in Examples 1-3 remained stable at 92%, demonstrating a highly efficient and robust bond between the microspheres and the fabric. Comparative Example 1, lacking only the temperature-sensitive shell material, achieved a microsphere fixation rate of 91%, essentially the same as the Example groups, with no significant impact. Comparative Example 2, due to the absence of cationic modified guar gum, saw its microsphere fixation rate plummet to 65%. These results confirm that cationic modified guar gum is the core key to achieving efficient microsphere fixation on the fabric surface. The introduction of the temperature-sensitive shell material has no negative impact on the microsphere fixation effect. The process combination of this technology can ensure stable bonding between the microspheres and the fabric while maintaining temperature-sensitive fragrance release.

[0034] 5. Fabric hand feel rating The hand feel score of the fabric was determined using a blind sensory evaluation method commonly used in the textile industry. Scent-retaining materials prepared in Examples 1-3 and Comparative Examples 1-2, as well as blank raw cotton fabrics, were all cut into complete 20cm×20cm samples, ensuring no damage or wrinkles. Each group of samples was individually numbered and blindly evaluated. A panel of 10 professionally trained textile testing personnel was selected. In a constant environment of 25℃±1℃ and relative humidity 60%±5%, the evaluators touched and rubbed the samples, scoring them on a 1-5 scale based on three dimensions: softness, smoothness, and stiffness (5 points for the best hand feel, soft and smooth with no stiffness; 1 point for the worst hand feel, stiff and rough with no suppleness). The highest and lowest scores in each group were removed, and the arithmetic mean of the remaining 8 scores was calculated as the final hand feel score for the sample, rounded to one decimal place.

[0035] Table 5. Hand feel rating table for different sample fabrics

[0036] The overall hand feel score of the fabrics in Examples 1-3 reached 4.8 points, while that in Comparative Examples 1-2 was 4.5-4.6 points. Although both were slightly lower than the 5.0 points of the blank original cotton fabric, they remained at a high level, with no obvious stiffness, roughness, or other deterioration in hand feel. This result indicates that the technology, in the process of performing multifunctional finishing on fabrics such as fragrance retention and temperature sensitivity, did not significantly damage the core hand feel indicators such as softness and smoothness, thus balancing the functionality and skin-friendliness of the fabric and meeting the hand feel requirements for apparel fabrics.

[0037] 6. Fabric breathability The air permeability of fabrics was determined using a fabric air permeability meter, referring to the currently valid standard GB / T. According to 5453-1997 "Determination of Air Permeability of Textile Fabrics", the following requirements apply: Take the fragrance-retaining materials prepared in Examples 1-3 and Comparative Examples 1-2, as well as blank raw cotton fabrics, and cut them into circular samples (40mm in diameter, 19.6cm²) suitable for the instrument. Five parallel samples should be prepared for each sample, ensuring they are undamaged, wrinkle-free, and spliced. Before testing, conditioned the samples for 24 hours in standard atmosphere at 25℃±1℃ and 60%±5% relative humidity. Fix the samples flat on the test head of the air permeability meter, ensuring the edges are sealed and leak-free. Set the test pressure difference to 100Pa (standard pressure difference for conventional apparel fabrics). Start the instrument to measure the airflow rate passing vertically through a unit area of ​​the sample per unit time, expressed in mm / s. Record the test data for each of the five parallel samples. After removing the maximum and minimum values, calculate the arithmetic mean of the remaining three sets of data as the final air permeability test result for the sample. The result should be rounded to one decimal place. Simultaneously record the test environment parameters and the sample test surface information.

[0038] Table 6. Air permeability test data of different sample fabrics (mm / s)

[0039] The air permeability of the fabrics in Examples 1-3 was 286.7-287.5 mm / s, while the air permeability of Comparative Examples 1-2 decreased slightly. The air permeability of the blank original cotton fabric was 296.4 mm / s. The air permeability of all samples was far higher than the conventional usage threshold for apparel fabrics. This result proves that the microsphere fixation and functional finishing process of this technology only has a slight impact on the air permeability of the fabric, without substantial loss. The finished fabric still maintains good air permeability, which can meet the air permeability requirements during actual wear, avoiding the problem of a significant decrease in fabric air permeability after traditional functional finishing.

[0040] 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.

Claims

1. A fabric fragrance-retaining material containing plant extracts, characterized in that, The fragrance-retaining material comprises hydrophilic and hydrophobic biphase microspheres and a fabric substrate, and is prepared from the following raw materials in parts by weight: Hydrophilic-hydrophobic biphase microspheres: 30-50 parts plant extract, 14-28 parts polyvinylpyrrolidone, 6-12 parts N-isopropylacrylamide, 0.5-2 parts initiator, 1-3 parts emulsifier, 50-80 parts hydrophobic dispersion medium, and 100-200 parts deionized water; the hydrophilic-hydrophobic biphase microspheres use plant extract as the core material and the shell is a water-temperature dual-responsive polyvinylpyrrolidone-N-isopropylacrylamide copolymer; The fabric substrate has a modified guar gum targeted adsorption layer on its fiber surface, and the hydrophilic and hydrophobic biphase microspheres are stably bonded to the fabric fibers through the targeted adsorption layer; the dual-response copolymer achieves water-wash fragrance locking and dry-state temperature-sensitive fragrance release through the swelling and shrinkage of the hydrophilic / hydrophobic segments.

2. The fabric fragrance-retaining material containing plant extracts according to claim 1, characterized in that, In the polyvinylpyrrolidone-N-isopropylacrylamide copolymer, the mass ratio of polyvinylpyrrolidone to N-isopropylacrylamide is 7:3-6:4, and the volume phase transition temperature of the copolymer is 28℃-30℃.

3. The fabric fragrance-retaining material containing plant extracts according to claim 1, characterized in that, The hydrophilic-hydrophobic biphase microspheres have a particle size of 3-8 μm, a core-to-wall mass ratio of 3:1-5:1, and plant extracts account for 60%-80% of the mass of the core material.

4. The fabric fragrance-retaining material containing plant extracts according to claim 1, characterized in that, The plant extract is selected from one or more of rose essential oil, lavender essential oil, tea tree essential oil, citrus essential oil, and jasmine essential oil; the initiator is one or more of ammonium persulfate, potassium persulfate, and azobisisobutyronitrile; the emulsifier is Tween-80, Span-60, or a compound emulsifier thereof; and the hydrophobic dispersion medium is polysiloxane or liquid paraffin.

5. A fabric fragrance-retaining material containing plant extracts according to claim 1, characterized in that, The modified guar gum targeted adsorption layer has a thickness of 50-100 nm and is prepared using cationic modified guar gum. Its loading on the surface of the fabric fiber is 0.5% owf-2.0% owf.

6. A fabric fragrance-retaining material containing plant extracts according to claim 1, characterized in that, The fragrance material has a fragrance retention rate of 80%-90% after 40 standard water washes, and the fragrance retention time at room temperature is 60-90 days. The fragrance release rate at dry temperatures above 30°C is 30%-50% higher than that at temperatures below 25°C.

7. A method for preparing a fabric fragrance-retaining material containing plant extracts, characterized in that, The method for preparing a fabric fragrance-retaining material containing plant extracts according to any one of claims 1-6 is as follows: S1. Weigh the plant extract, polyvinylpyrrolidone, N-isopropylacrylamide, initiator, emulsifier, hydrophobic dispersion medium, and deionized water according to the following weight parts: Add the polyvinylpyrrolidone and N-isopropylacrylamide monomers to the deionized water, stir to dissolve, adjust the pH of the system to 5.5-6.5, heat to 50-55℃ and keep warm for 10-15 min to obtain the shell material prepolymer solution; Add the initiator to the shell material prepolymer solution, stir and disperse for 5-10 min, and slowly add the mixture of plant extract and hydrophobic dispersion medium at a rate of 0.5-1.0 mL / min, while adjusting the stirring speed to 300-500 rpm to form a stable emulsion; Heat to 60-65℃ and keep warm for 3-4 h for polymerization, cool to room temperature after the reaction is completed, centrifuge, wash, and vacuum dry at 50-60℃ for 2-3 h to obtain hydrophilic and hydrophobic biphase microspheres with a particle size of 3-8 μm; S2. Dissolve the modified guar gum in deionized water, stir to dissolve, and then add 0.1%-0.3% preservative to prepare an adsorption layer treatment solution with a mass concentration of 1%-3% and a pH value of 6.0-7.

0. After the fabric substrate has been pretreated by degreasing and bleaching, it is immersed in the treatment solution at 40℃-50℃ with a bath ratio of 1:20-1:30 for 20-30 minutes. After two dips and two nips, it is dried at 80℃-90℃ for 15-20 minutes to obtain a fabric with a modified guar gum targeted adsorption layer on the surface. S3. Add deionized water to the biphasic microspheres and ultrasonically disperse them at 300-500W for 10-15 minutes to prepare a microsphere finishing solution with a mass concentration of 5%-10%. Add 0.2%-0.5% dispersant to adjust the stability. Immerse the fabric treated in step S2 into the finishing solution and soak it at 45-55℃ for 30-40 minutes with a liquor ratio of 1:20-1:

30. After two dips and two nips, use a gradient drying process to dry the fabric sequentially at 60℃ for 10-15 minutes, 80℃ for 10-15 minutes, and 100℃ for 5-10 minutes. After natural cooling, the fabric fragrance material is obtained.

8. The method for preparing a fabric fragrance material containing plant extracts according to claim 7, characterized in that, In step S1, when the initiator is ammonium persulfate or potassium persulfate, the reaction system needs to be protected by nitrogen gas, and the nitrogen flow rate is 0.5-1.0 L / min; when the emulsifier is a mixture of Tween-80 and Span-60, the mass ratio of the two is 1:1-2:

1.

9. The application of a fabric fragrance-retaining material containing plant extracts according to any one of claims 1-6, characterized in that, The material is suitable for cotton, linen, chemical fiber and blended fabrics, and can be applied to high-frequency washed fabrics such as underwear, children's clothing, home textiles and towels.

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