Deodorizing microcapsules, deodorizing fabrics and methods for making the same

Abstract

This invention belongs to the field of textile technology and provides deodorizing microcapsules, deodorizing fabrics, and their preparation methods. The method includes mixing plant extracts, a first wall material, and an emulsifier, homogenizing and emulsifying them, and spray drying to obtain single-layer microcapsules; mixing the single-layer microcapsules, grain fermentation products, a second wall material, and an emulsifier, homogenizing and emulsifying them, and spray drying to obtain deodorizing microcapsules, wherein the second wall material is a porous wall material. The deodorizing microcapsules of this invention are porous double-layer microcapsules, which, through the multiple effects of plant extracts, grain fermentation products, and the first wall material, possess long-lasting deodorizing properties.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to deodorizing microcapsules, deodorizing fabrics, and methods for their preparation. Background Technology

[0002] In recent years, consumer demand for home furnishings has gradually shifted towards comfort, health, and functionality. Consequently, various deodorizers, odor removers, and fragrances have been developed. Among these, textiles with deodorizing properties show promising application prospects in the clothing and home textile industries.

[0003] Currently, commercially available deodorizing finishing agents for textiles are generally only effective at removing odor components such as acetic acid, isovaleric acid, and ammonia. However, GB / T33610 clearly identifies another substance that contributes to body odor, namely 2-nonenal, and stipulates in this standard that the concentration reduction rate of 2-nonenal must not be less than 75%.

[0004] Currently, odor elimination mainly relies on adsorption, such as using activated carbon as an adsorbent. However, its adsorption efficiency for 2-nonenal is low and lacks specificity, making it unsuitable for developing deodorizing textiles targeting body odor. Existing technologies also utilize other odors to mask or neutralize them, but these methods do not eliminate the odor at its source, and the fragrances and other ingredients used lose their effectiveness after a period of use, making it difficult to further eliminate the odor. For example, patent CN116803312A discloses an antibacterial and deodorizing pillow that abandons the existing solution of physically adsorbing odors with activated carbon and other ingredients. Instead, it uses antibacterial agents and biological deodorizers to decompose odors at their source, achieving a long-lasting deodorizing effect. However, its deodorizing effect relies solely on sensory judgment of sweat composition and does not provide a specific quantitative analysis of the effects on various complex body odor components.

[0005] For example, patent CN113862822A discloses a method for preparing deodorizing spandex. Utilizing the principle of ammonia adsorption by carboxyl groups, it introduces phenylcarboxylic acid ammonium groups onto the spandex molecular chain and prepares deodorizing spandex through in-situ polymerization. This method can quickly adsorb ammonia and has good wash resistance. However, the deodorizing spandex prepared by this method is only effective against ammonia, and cannot achieve a good deodorizing effect in complex real-world environments with body odor.

[0006] Therefore, there is a need to develop an odor-eliminating fabric. If it can eliminate the odors of human body gases such as acetic acid, isovaleric acid, ammonia, and 2-nonenal, it will have greater value for widespread application. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the present invention provides deodorizing microcapsules, deodorizing fabrics and their preparation methods to solve the problems of existing deodorizing agents lacking deodorizing efficacy against the odor component 2-nonenal, and having substandard and unsustainable deodorizing effects.

[0008] To achieve the above and related objectives, the present invention adopts the following technical solution:

[0009] The first aspect of this invention provides a method for preparing deodorizing microcapsules, comprising the following steps:

[0010] (1) Mix plant extracts, first wall material and emulsifier, homogenize and emulsify, spray dry to obtain single-layer microcapsules;

[0011] (2) Mix single-layer microcapsules, grain fermentation product, second wall material and emulsifier, homogenize and emulsify, spray dry to obtain deodorizing microcapsules, wherein the second wall material is a porous wall material.

[0012] In one embodiment of this application, the plant extract is one or more of the following: green tea, oolong tea, sweet tea, astringent persimmon, lotus leaf, apple, mulberry, almond, apricot, peach, redwood, orange blossom, lavender, bergamot, sage, coriander, rose, jasmine, ylang-ylang, gardenia, fennel, persimmon fruit, scutellaria, evening primrose, and sugarcane extract.

[0013] In one embodiment of this application, the grain fermentation product is one or more of rice, corn, highland barley, glutinous rice, sorghum, oats, wheat, and buckwheat fermentation products that have been fermented by microorganisms, wherein the microorganisms are lactobacilli, lactic acid bacteria, yeast, or Aspergillus.

[0014] In one embodiment of this application, step (2) further includes fruit peel essential oil, which is one or more of orange peel, grapefruit peel, tangerine peel, and lemon peel essential oil.

[0015] In one embodiment of this application, the first wall material is one or more of maltodextrin, cyclodextrin, chitosan, gum arabic, alginate, sodium alginate, casein, amino acids, gelatin, methylcellulose, ethylcellulose, and sodium carboxymethylcellulose;

[0016] And / or, the second wall material is porous starch, porous polyurea resin or porous epoxy resin;

[0017] And / or, the emulsifier is one or a mixture of polyether-modified silicone, polyether-modified fluorine, alkyl polyether, Tween 40, Tween 60, Tween 80, Span 80, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfate.

[0018] In one embodiment of this application, the mass ratio of plant extract to first wall material in step (1) is 1:(0.1~10);

[0019] And / or, in step (2), the mass ratio of monolayer microcapsules, grain ferment, fruit peel essential oil, and second wall material is 1:(0.1-0.5):(0.01-0.03):(1-10).

[0020] In one embodiment of this application, the method for preparing grain fermentation product includes:

[0021] A fermentation culture medium is prepared using grains and water as raw materials. The grains are one or more of the following: rice, corn, highland barley, glutinous rice, sorghum, oats, wheat, and buckwheat.

[0022] The activated microorganisms were inoculated into the fermentation medium for fermentation.

[0023] After fermentation, the product is sterilized, freeze-dried into powder, and the fermented grain product is obtained.

[0024] A second aspect of the present invention provides deodorizing microcapsules prepared according to the above-described preparation method.

[0025] A third aspect of this invention provides a method for preparing an odor-degrading fabric, comprising the following steps:

[0026] The above-mentioned deodorizing microcapsules are formulated into a finishing solution, and the finishing solution is applied to the fabric through a post-finishing process to obtain a deodorizing fabric. The post-finishing process includes coating, padding, spraying, or printing.

[0027] In one embodiment of this application, the concentration of the finishing solution is 1 to 100 g / L.

[0028] A fourth aspect of the present invention provides an odor-degrading fabric prepared according to the above-described preparation method.

[0029] The beneficial technical effects of this invention are as follows:

[0030] This invention first utilizes plant extracts to prepare single-layer microcapsules. The plant extracts selected in this invention contain various polyhydroxyphenolic compounds, including catechins, flavonoids, and anthocyanins, which possess strong antioxidant activity and potential health benefits, with existing applications in anti-inflammatory and antibacterial properties, enhancing immunity, preventing cardiovascular diseases, and delaying aging. Furthermore, existing research has found that polyphenolic compounds in plant extracts also have a significant deodorizing effect on 2-nonenal; however, plant extracts are easily oxidized and unstable under natural conditions. Therefore, this invention employs microencapsulation technology to first encapsulate the plant extracts, allowing them to maintain their original chemical properties and biological activity in a micro-sized state, improving the release performance and bioavailability of active ingredients, and to some extent compensating for the instability of extracts under natural conditions. In addition, the present invention selects cyclodextrin, chitosan, sodium carboxymethyl cellulose, gelatin, sodium alginate and other substances as the first wall material. In addition to having important functions such as shaping, acting as a carrier, improving stability, solubilizing, aiding solubility and controlled release, their molecules themselves have great application potential in the field of adsorption due to the large number of hydroxyl groups, hydrophobic cavities and interactions with organic and inorganic compounds.

[0031] Based on the preparation of single-layer microcapsules, this invention prepares a grain fermentation product, which is then used as a second core material and mixed with the single-layer microcapsules. Both are then encapsulated together by a second wall material to create deodorizing microcapsules with a double-layer structure. The grain fermentation product contains proteins, carbohydrates, organic acids, lipids, alcohols, various microorganisms, and substances such as calcium, phosphorus, and iron. The perceptible odors contain functional groups such as -NH2, =NH, -OH, -SH, =S, and -CHO, which are usually negatively charged. By combining with positive charges, these functional groups can alter the composition of the odor, thus eliminating it. The grain fermentation product of this invention contains a large number of positively charged calcium and iron ions, which can combine with a large number of negative charges in the odor, thereby achieving the purpose of deodorization. Furthermore, 2-nonenal is soluble in alcohols such as ethanol in the grain fermentation product of this invention, thereby reducing the 2-nonenal content and achieving the purpose of deodorization. Moreover, the grain fermentation product is safe and healthy, has antibacterial properties, and will not cause discoloration or deterioration of fabrics.

[0032] The mechanism of action of the deodorizing fabric of this invention is as follows: Because the second wall material is porous, it can promote the slow release of grain fermentation products and plant extracts. This invention, on the one hand, alters the chemical structure of odorous substances by utilizing positively charged components in the grain fermentation products, thereby destroying the odorous substances and eliminating some of the odor; on the other hand, it dissolves 2-nonenal by alcohols in the grain fermentation products, reducing the content of 2-nonenal to deodorize; and on the other hand, it deodorizes through the physical adsorption of plant extracts. The plant extracts adsorb odor molecules such as acetic acid, isovaleric acid, ammonia, and 2-nonenal on the fabric surface and in the fiber gaps through van der Waals forces, electrostatic attraction, and hydrogen bonding. Furthermore, the abundant O and N elements in the first wall material form hydrogen bonds with the hydroxyl groups on odor molecules such as 2-nonenal. In addition, the C element in the aldehyde group of the 2-nonenal molecule is slightly positively charged due to electron pair shift, which can generate electrostatic attraction or induction with the strongly electronegative O- and N- groups in the first wall material. At the same time, the active ingredients in plant extracts can also form intermolecular forces with odor molecules.

[0033] The deodorizing microcapsules of this invention are porous, double-layered microcapsules. Through the combined effects of plant extracts, grain fermentation products, and a first wall material, they exhibit long-lasting deodorizing performance. Furthermore, thanks to the porous second wall material, the surface of the deodorizing microcapsules has a wrinkled, uneven morphology, resulting in a large specific surface area and numerous adsorption active sites. This fully leverages the synergistic adsorption effect of the core and wall materials, leading to stronger and more stable deodorizing performance.

[0034] The deodorizing microcapsules of this invention also contain fruit peel essential oil, and the deodorizing fabric prepared has a fresh scent.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Detailed Implementation

[0036] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of the invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. Conversely, multiple features of the invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of the invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of the invention are merely illustrative and should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be covered within the scope of protection of the invention.

[0037] This invention provides a method for preparing deodorizing microcapsules, comprising the following steps:

[0038] (1) Mix the plant extract, the first wall material and the emulsifier, stir with a magnetic stirrer, homogenize and emulsify for 1 to 6 hours, the emulsification temperature is 20 to 80°C, and after emulsification, spray dry to obtain single-layer microcapsules.

[0039] (2) Mix the single-layer microcapsules, grain fermentation product, second wall material and emulsifier, stir with a magnetic stirrer, homogenize and emulsify for 1 to 6 hours at an emulsification temperature of 25 to 45°C, and spray dry to obtain deodorizing microcapsules, wherein the second wall material is a porous wall material.

[0040] Furthermore, the plant extracts are one or more of the following: green tea, oolong tea, sweet tea, astringent persimmon, lotus leaf, apple, mulberry, almond, apricot, peach, redwood, orange blossom, lavender, bergamot, sage, coriander, rose, jasmine, ylang-ylang, gardenia, anise, persimmon fruit, scutellaria, evening primrose, and sugarcane extract.

[0041] Furthermore, the first wall material is one or more of the following: maltodextrin, cyclodextrin, chitosan, gum arabic, alginate, sodium alginate, casein, amino acids, gelatin, methylcellulose, ethylcellulose, and sodium carboxymethylcellulose.

[0042] Furthermore, the emulsifier is one or a mixture of polyether-modified silicone, polyether-modified fluorine, alkyl polyether, Tween 40, Tween 60, Tween 80, Span 80, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfate.

[0043] Furthermore, the grain fermentation product is one or more of the following: rice, corn, highland barley, glutinous rice, sorghum, oats, wheat, and buckwheat fermentation products, wherein the microorganisms are lactobacilli, lactic acid bacteria, yeast, or Aspergillus.

[0044] Furthermore, the preparation method of grain fermentation products is as follows:

[0045] A fermentation medium is prepared by mixing one or more of the following ingredients: rice, corn, highland barley, glutinous rice, sorghum, oats, wheat, and buckwheat with water at a mass ratio of (60-100):(500-1000).

[0046] Inoculate the activated microorganisms into the fermentation medium at an inoculation rate of 5-10% and culture for 5-10 days. The fermentation culture pH is 5.0-7.0 and the temperature is 30-40℃.

[0047] After fermentation, the product is sterilized at a temperature of 65℃~120℃ for 15~60 minutes, and then freeze-dried into powder to obtain the fermented grain product.

[0048] Furthermore, the second wall material is porous starch, porous polyurea resin, or porous epoxy resin.

[0049] Furthermore, in step (1), the mass ratio of plant extract to first wall material is 1:(0.1-10).

[0050] Furthermore, step (2) also includes fruit peel essential oil, which is one or more of the following: orange peel, grapefruit peel, tangerine peel, and lemon peel essential oil.

[0051] Furthermore, in step (2), the mass ratio of the monolayer microcapsule, grain ferment, fruit peel essential oil, and second wall material is 1:(0.1-0.5):(0.01-0.03):(1-10).

[0052] The present invention also provides deodorizing microcapsules prepared according to the above preparation method.

[0053] This invention also provides a method for preparing an odor-degrading fabric, comprising the following steps:

[0054] The above-mentioned deodorizing microcapsules are formulated into a finishing solution with a concentration of 1-100 g / L. The finishing solution is then applied to the fabric through a post-finishing process to obtain the deodorizing fabric. The post-finishing process includes coating, padding, spraying, or printing.

[0055] Furthermore, the fabrics of the present invention include, but are not limited to, cotton, cotton-polyester blends, and polyester.

[0056] The present invention also provides an odor-degrading fabric prepared according to the above preparation method.

[0057] The present invention will be described in detail below through specific examples and embodiments. It should also be understood that the following embodiments are only for specific illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0058] Example 1

[0059] (1) A mixture of oolong tea and sweet tea extracts was used as the first core material, and chitosan was used as the first wall material. 2g of chitosan was weighed and dissolved in 50mL of 3% (v / v) acetic acid solution, and sonicated for 30min to obtain a chitosan solution, which was then allowed to stand for later use. 0.5g of oolong tea extract and 0.5g of sweet tea extract were weighed and dissolved together in 25mL of anhydrous ethanol, along with 0.5g of Span 80. The mixture was heated to 60℃ with stirring, and the chitosan solution was slowly added. After the addition was complete, the mixture was stirred for 6h. After the reaction was complete, the mixture was centrifuged, and the resulting gel solid was washed with ethanol and spray-dried to obtain monolayer microcapsules.

[0060] (2) Rice, corn, barley and water were mixed in a mass ratio of 40:15:10:600 to prepare a fermentation medium; activated lactobacillus was inoculated into the fermentation medium at an inoculation amount of 5% and cultured for 7 days. The fermentation culture pH was 5.0 and the temperature was 30℃. After fermentation, the mixture was sterilized at a temperature of 80℃ for 15 minutes and then freeze-dried into powder to obtain the grain fermentation product.

[0061] Single-layer microcapsules, grain fermentation products, orange peel essential oil, porous polyurea resin, and Tween 80 were mixed in a mass ratio of 1:0.3:0.01:3:1, homogenized and emulsified for 6 hours at an emulsification temperature of 45°C, and then spray-dried to obtain deodorizing microcapsules.

[0062] (3) Take 1g of deodorizing microcapsules and disperse them in 100mL of deionized water to obtain a finishing solution with a concentration of 10g / L. Take 10g of pure cotton fabric and soak it in the finishing solution. After one soaking and one rolling, the liquid retention rate is 80%. Place the finished pure cotton fabric in a 170℃ oven and bake for 4min to obtain the deodorizing fabric.

[0063] Example 2

[0064] The difference between this embodiment and Embodiment 1 is that:

[0065] Lotus leaf extract was used as the first core material, and β-cyclodextrin as the first wall material. 2g of β-cyclodextrin was dissolved in 50mL of a mixed solution of deionized water and anhydrous ethanol (volume ratio 2:1), and sonicated for 30min to obtain a cyclodextrin solution, which was then allowed to stand. 1g of lotus leaf extract was dissolved in 25mL of anhydrous ethanol, and 0.5g of Span 80 was added simultaneously. The mixture was heated to 60℃ with stirring, and the cyclodextrin solution was slowly added. After the addition was complete, the reaction was continued with stirring for 6h. After the reaction was complete, the mixture was centrifuged, and the resulting gel solid was washed with ethanol and spray-dried to obtain monolayer microcapsules.

[0066] Example 3

[0067] The difference between this embodiment and Embodiment 1 is that:

[0068] Rice, sorghum, wheat, corn, and water were mixed in a mass ratio of 25:15:15:10:700 to prepare a fermentation medium. Activated Aspergillus was inoculated into the fermentation medium at an inoculum size of 8%, and cultured for 10 days at a pH of 5.5 and a temperature of 40℃. After fermentation, the mixture was sterilized at a temperature of 90℃ for 20 minutes and then freeze-dried into powder to obtain the grain fermentation product.

[0069] Single-layer microcapsules, grain fermentation products, grapefruit peel essential oil, porous polyurea resin, and Tween 60 were mixed in a mass ratio of 1:0.5:0.02:2:1, homogenized and emulsified for 6 hours at an emulsification temperature of 45°C, and then spray-dried to obtain deodorizing microcapsules.

[0070] Example 4

[0071] The difference between this embodiment and Embodiment 1 is that:

[0072] 2g of deodorizing microcapsules were dispersed in 100mL of deionized water to obtain a finishing solution with a concentration of 20g / L. 10g of polyester-cotton fabric was soaked in the finishing solution. After one soaking and one rolling, the liquid retention rate was 80%. The finished polyester-cotton fabric was placed in an oven at 170℃ and baked for 4min to obtain the deodorizing fabric.

[0073] Comparative Example 1

[0074] Take 1g of chitosan and disperse it in 100mL of deionized water to obtain a finishing solution with a concentration of 10g / L. Take 10g of pure cotton fabric and soak it in the finishing solution. After one dip and one roll, the liquid retention rate is 80%. Place the finished polyester-cotton fabric in an oven at 170℃ and bake for 4 minutes to obtain the fabric.

[0075] Comparative Example 2

[0076] (1) A mixture of oolong tea and sweet tea extracts was used as the first core material, and chitosan was used as the first wall material. 2g of chitosan was weighed and dissolved in 50mL of 3% acetic acid solution, and sonicated for 30min to obtain a chitosan solution, which was then allowed to stand for later use. 0.5g of oolong tea extract and 0.5g of sweet tea extract were weighed and dissolved together in 25mL of anhydrous ethanol, along with 0.5g of Span 80. The mixture was heated to 60℃ with stirring, and the chitosan solution was slowly added. After the addition was complete, the mixture was stirred for 6h. After the reaction was complete, the mixture was centrifuged, and the resulting gel solid was washed with ethanol and spray-dried to obtain microcapsules.

[0077] (2) Take 1g of microcapsules and disperse them in 100mL of deionized water to obtain a finishing solution with a concentration of 10g / L. Take 10g of pure cotton fabric and soak it in the finishing solution. After one soaking and one rolling, the liquid retention rate is 80%. Place the finished pure cotton fabric in a 170℃ oven and bake for 4min to obtain deodorized fabric.

[0078] Comparative Example 3

[0079] (1) Rice, corn, barley and water were mixed in a mass ratio of 40:15:10:600 to prepare a fermentation medium; activated lactobacillus was inoculated into the fermentation medium at an inoculation amount of 5% and cultured for 7 days. The fermentation culture pH was 5.0 and the temperature was 30℃. After fermentation, the mixture was sterilized at a temperature of 80℃ for 15 minutes and then freeze-dried into powder to obtain the grain fermentation product.

[0080] Grain fermentation product, orange peel essential oil, porous polyurea resin, and Tween 80 were mixed in a mass ratio of 1:0.3:0.01:3:1, homogenized and emulsified for 6 hours at an emulsification temperature of 45°C, and then spray-dried to obtain microcapsules.

[0081] (2) Take 1g of microcapsules and disperse them in 100mL of deionized water to obtain a finishing solution with a concentration of 10g / L. Take 10g of pure cotton fabric and soak it in the finishing solution. After one soaking and one rolling, the liquid retention rate is 80%. Place the finished pure cotton fabric in a 170℃ oven and bake for 4min to obtain deodorized fabric.

[0082] Comparative Example 4

[0083] The difference between this comparative example and Example 1 is as follows:

[0084] Single-layer microcapsules, grain fermentation products, porous polyurea resin, and Tween 80 were mixed in a mass ratio of 1:0.3:3:1, homogenized and emulsified for 6 hours at an emulsification temperature of 45°C, and then spray-dried to obtain deodorizing microcapsules.

[0085] Performance testing

[0086] Antibacterial properties: The antibacterial properties of the deodorized fabric before and after treatment against Staphylococcus aureus ATCC6538, Escherichia coli ATCC25922 and Candida albicans ATCC10231 were determined by shaking flask method according to GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method".

[0087] Antimicrobial properties were tested on the deodorizing fabrics of Examples 1-4 and Comparative Examples 1-4, and the results were recorded as the initial antimicrobial rate. Then, the deodorizing fabrics prepared in the examples and the deodorizing fabrics prepared in the comparative examples were washed as follows: At 25°C, the deodorizing fabrics prepared in the examples and the deodorizing fabrics prepared in the comparative examples were immersed in a 20% sodium stearate solution for 5 minutes, respectively, then rinsed 5 times with clean water, and dried to complete one washing cycle. The deodorizing fabrics prepared in the examples and the deodorizing fabrics prepared in the comparative examples were washed 10 times and 20 times, respectively. The antimicrobial test results are shown in Tables 1 and 2.

[0088] Dissolution of antibacterial substances: The dissolution of antibacterial substances was tested according to Appendix A of GB / T 31713-2015, specifically as follows:

[0089] In Examples 1-4, deodorizing fabrics were prepared using fabrics with specifications of 40s*40s / 144*85. Three 1.5cm*1.5cm fabric samples were cut from different parts of the fabrics in each example as test samples.

[0090] For comparative examples 1 to 4, deodorizing fabrics were prepared using fabrics with specifications of 40s*40s / 144*85. Three 1.5cm*1.5cm fabric samples were cut from different parts of each comparative example fabric as test samples.

[0091] Three pieces of two-layer 100% polyester knitted fabric sewn together were used as wash diapers. The mass per unit area of ​​each piece of fabric was 125% of the mass per unit area of ​​the sample to be tested. Each piece of wash diapers was 30cm*30cm in size.

[0092] Each of the above-mentioned test samples, test specimens, and accompanying fabrics should be washed once according to the requirements of Appendix B and Appendix C of FZ / T 73023-2006, and then set aside for use.

[0093] Prepare several standard blank samples according to Appendix A of FZ / T 73023-2006, cut them to 1.5cm*1.5cm, wash them once according to Appendix B of FZ / T 73023-2006, and set them aside for use;

[0094] After washing, sterilize the standard blank samples, each test sample, and each test sample at 103 kPa and 121 °C for 15 min for later use.

[0095] Staphylococcus aureus (ATCC 6538), Escherichia coli (ATCC 25922), and Candida albicans (ATCC 10231) were selected as test strains. Multiple sets of antimicrobial dissolution tests were conducted on the sterilized standard blank, each test sample, and each sample to be tested. The dissolution of antimicrobial substances in each test sample and sample was determined based on the maximum inhibition zone width (D) against Staphylococcus aureus, Escherichia coli, and Candida albicans. The test results are shown in Table 3.

[0096] Odor deodorization performance of textiles: The odor deodorization performance of the deodorizing fabrics prepared in Examples 1-4 and the fabrics prepared in Comparative Examples 1-4 were tested according to GB / T 33610.3-2019 "Determination of odor deodorization performance of textiles", as follows:

[0097] The reagents include: ammonia, acetic acid sample gas, isovaleric acid (purity 98.0%), 2-nonenal (purity 95.0%), dilution gas (nitrogen with purity of 99.99% or higher), and ethanol (analytical grade).

[0098] Take the dimension as (50±2.5)cm 2 Four pieces each of the deodorizing fabrics in Examples 1-4 and Comparative Examples 1-4 were used as test samples.

[0099] Gas chromatography: Prepare several 500mL glass conical flasks, half of which are used for sample testing and the other half for blank detection. The fabrics of each example and comparative example are tested separately for isovaleric acid and 2-nonenal.

[0100] Before testing, purge the conical flask with nitrogen gas at a volume greater than 5 times that of the flask, and adjust the humidity and test environment.

[0101] Accurately weigh 20g of isovaleric acid into a volumetric flask and dilute to the mark with ethanol; accurately weigh 10g of 2-nonenal into a volumetric flask and dilute to the mark with ethanol.

[0102] Each of the above-mentioned test samples was used for isovaleric acid and 2-nonenal testing, respectively. Each test sample was laid flat at the bottom of an Erlenmeyer flask, and 1000 mL of nitrogen gas was blown into the flask to expel the air inside. The flask opening was then sealed with a sealing film. Using a syringe, 5 μL of the prepared isovaleric acid and 2-nonenal solution was injected through the sealing film along the inner wall of the Erlenmeyer flask, ensuring that the solution did not come into contact with the test samples. The needle hole was then sealed again with a sealing film.

[0103] Let it stand for 2 hours under the standard atmospheric conditions specified in GB / T 6529.

[0104] For blank testing, repeat the above steps without placing the test sample.

[0105] After 2 hours of contact, hold the conical flask by the mouth and shake it vigorously about 20 times within 20 seconds, with or without the test sample. Insert the gas-tight injection needle vertically about 4 cm into the center of the sealing membrane at the mouth of the conical flask. Use the gas-tight injection needle to draw the test gas from the flask; the sample volume depends on the type of gas chromatograph used.

[0106] Detection tube method: Place each sample to be tested in a sampling bag, evacuate the gas in the sampling bag using a vacuum pump or vacuum pump, inject 3L of ammonia and acetic acid sample gas into the sampling bag respectively using an air pump, let stand for 2 hours, and use a 100mL syringe to extract 100mL of the gas to be tested from each sampling bag containing the sample, and read the color change position scale through the detection tube.

[0107] The ORR% (Organic Rate of Reduction) of odor chemical components was calculated, and the results are shown in Table 4.

[0108] Table 1. Antimicrobial test results of fabrics in each embodiment and comparative example.

[0109]

[0110] Table 2. Antimicrobial test results of fabrics in each embodiment and comparative example.

[0111]

[0112]

[0113] (Note: The sample has antibacterial effect if the inhibition rate against Staphylococcus aureus and Escherichia coli is ≥70% and the inhibition rate against Candida albicans is ≥60%.)

[0114] As shown in Tables 1 and 2, after 20 washes, the deodorizing fabrics of Examples 1-4 of the present invention all exhibited an inhibition rate of >86% against Staphylococcus aureus, Escherichia coli, and Candida albicans, and the inhibition rate was greater than that of the fabrics in Comparative Examples 1-4. This indicates that the deodorizing fabric of the present invention has long-lasting antibacterial properties and good washability.

[0115] Comparative Example 1 fabric had the lowest antibacterial rate. This is because the fabric treated with chitosan alone had relatively poor water resistance. As the number of washes increased, a large amount of chitosan adsorbed on the fabric surface was lost, and the antibacterial effect gradually deteriorated. Furthermore, the fabric treated with chitosan finishing solution had relatively fewer effective antibacterial components compared to the embodiments of the present invention.

[0116] Comparative Example 2 is a single-layer plant microcapsule finished fabric, and Comparative Example 3 is a single-layer grain fermented microcapsule finished fabric. Compared with the embodiments of the present invention, both have fewer effective antibacterial components, and therefore have poorer antibacterial performance.

[0117] Comparative Example 4 does not contain pericarp essential oil, and the pericarp essential oil has certain antibacterial and anti-inflammatory effects, so its antibacterial performance is inferior to the deodorant fabric of the examples of the present invention.

[0118] Table 3 Antibacterial substance dissolution test of fabrics of each example and each comparative example

[0119] Test object Maximum inhibition zone width D / mm Example 1 1.9 Example 2 1.6 Example 3 1.6 Example 4 1.3 Comparative Example 1 7.8 Comparative Example 2 4.2 Comparative Example 3 4.0 Comparative Example 4 2.5

[0120] (Note: Inhibition zone width D: D≤1mm is non-dissolution property, 1mm<D≤5mm is slight dissolution property, 5mm<D≤10mm is moderate dissolution property, D>10mm is dissolution property)

[0121] It can be seen from Table 3 that the maximum inhibition zone widths of the deodorant fabrics prepared by the present invention are all less than 2mm, and the dissolution properties of the antibacterial substances are non-dissolution and good slight dissolution properties, which indicates that the deodorant fabric of the present invention will not cause damage to human health and is safer and more reliable. While the fabrics of Comparative Examples 1 to 4 all show slight dissolution properties of antibacterial substances, their maximum inhibition zone widths are significantly higher than that of the deodorant fabric of the present invention, and their safety is lower than that of the deodorant fabric of the present invention. Moreover, the test results of each example and each comparative example show that the double-layer microcapsules prepared by compounding the plant extract, cereal fermentate and pericarp essential oil of the present invention can bind to fibers more firmly and have better safety.

[0122] Table 4 Deodorant performance of fabrics of each example and each comparative example

[0123] Test object Ammonia ORR / % Acetic acid ORR / % Isovalerate ORR / % 2-Nonenal ORR / % Example 1 90.7 98.9 95.1 75.2 Example 2 90.2 97.2 93.0 76.8 Example 3 91.1 98.3 94.7 79.6 Example 4 91.5 98.6 95.7 80.1 Comparative Example 1 43.0 75.6 45.5 34.3 Comparative Example 2 75.8 80.4 83.3 65.0 Comparative Example 3 78.5 78.6 79.8 66.2 Comparative Example 4 80.7 88.9 90.6 70.5

[0124] It can be seen from Table 4 that the deodorant fabrics prepared in the examples of the present invention have a concentration reduction rate of more than 90% for the malodorous chemical components of ammonia, acetic acid and isovaleric acid, and a concentration reduction rate of more than 75% for 2-nonenal, which meets the deodorant standard, shows good deodorant performance, and has a high removal rate of malodorous substances.

[0125] However, the fabric finished with chitosan in Comparative Example 1 has poor deodorant performance and shows a low concentration reduction rate of malodorous chemical components, which indicates that the deodorization effect cannot be effectively improved only by the binding of part of the positive charges carried by chitosan to the negative charges of malodorous chemical components.

[0126] The fabrics of Comparative Examples 2 to 4 show a medium concentration reduction rate of malodorous chemical components, with ordinary deodorant performance inferior to that of the deodorant fabric of the present invention, and their concentration reduction rate for 2-nonenal is lower than 75%, which does not meet the deodorant standard.

[0127] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing deodorizing microcapsules, characterized in that, Includes the following steps: (1) Mix plant extracts, first wall material and emulsifier, homogenize and emulsify, spray dry to obtain single-layer microcapsules; (2) The single-layer microcapsule, grain fermentation product, second wall material and emulsifier are mixed, homogenized and emulsified, and spray dried to obtain deodorizing microcapsule, wherein the second wall material is a porous wall material; The plant extracts are one or more selected from green tea, oolong tea, sweet tea, astringent persimmon, lotus leaf, apple, mulberry, almond, apricot, peach, redwood, orange blossom, lavender, bergamot, sage, coriander, rose, jasmine, ylang-ylang, gardenia, anise, persimmon fruit, scutellaria, evening primrose, and sugarcane extract; the plant extracts contain a variety of polyhydroxyphenolic compounds, including catechins, flavonoids, and anthocyanins; The grain fermentation product is one or more of rice, corn, highland barley, glutinous rice, sorghum, oats, wheat, and buckwheat fermentation products that have been fermented by microorganisms, wherein the microorganisms are lactobacilli, lactic acid bacteria, yeast, or Aspergillus; the positive charge of calcium and iron ions in the grain fermentation product can combine with the negative charge in the odor, and the alcohols in the grain fermentation product can dissolve 2-nonenal; The first wall material is one or more of the following: maltodextrin, cyclodextrin, chitosan, gum arabic, alginate, sodium alginate, casein, amino acids, gelatin, methylcellulose, ethylcellulose, and sodium carboxymethylcellulose. The second wall material is porous starch, porous polyurea resin or porous epoxy resin.

2. The preparation method according to claim 1, characterized in that, Step (2) also includes fruit peel essential oil, which is one or more of the following: orange peel, grapefruit peel, tangerine peel, and lemon peel essential oil.

3. The preparation method according to claim 1, characterized in that, The emulsifier is one or a mixture of polyether-modified silicone, polyether-modified fluorine, alkyl polyether, Tween 40, Tween 60, Tween 80, Span 80, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfate.

4. The preparation method according to claim 2, characterized in that, In step (1), the mass ratio of plant extract to first wall material is 1:(0.1~10). And / or, in step (2), the mass ratio of monolayer microcapsules, grain ferment, fruit peel essential oil, and second wall material is 1:(0.1~0.5):(0.01~0.03):(1~10).

5. The preparation method according to claim 1, characterized in that, The method for preparing the grain fermentation product includes: A fermentation culture medium is prepared using grains and water as raw materials, wherein the grains are one or more of rice, corn, highland barley, glutinous rice, sorghum, oats, wheat, and buckwheat; The activated microorganisms were inoculated into the fermentation medium for fermentation. After fermentation, the product is sterilized and freeze-dried into powder to obtain the fermented grain product.

6. The deodorizing microcapsules prepared by the preparation method according to any one of claims 1 to 5.

7. A method for preparing an odor-deodorizing fabric, characterized in that, Includes the following steps: The deodorizing microcapsules of claim 6 are formulated into a finishing liquid, and the finishing liquid is applied to the fabric by a post-finishing process to obtain a deodorizing fabric, wherein the post-finishing process is coating, padding, spraying or printing.

8. The deodorizing fabric prepared by the preparation method according to claim 7.

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