Natural antibacterial anti-mosquito fabric and preparation method thereof

Abstract

The invention discloses a natural antibacterial anti-mosquito fabric and a preparation method thereof. Firstly, a natural antibacterial mosquito-repellent microcapsule is prepared, citronella essential oil, eucalyptus leaf essential oil and mint essential oil are compounded to serve as a core material, Arabic gum / gelatin serves as a first-layer wall material, and beta-cyclodextrin serves as a second-layer wall material. The structure is a double-wall structure, so that the slow release time of effective components can be prolonged, and the action time of a functional fabric finished by the finishing agent is longer. And modifying the natural antibacterial fiber fabric with chitosan quaternary ammonium salt to obtain the modified natural antibacterial fiber fabric with improved antibacterial performance. Finally, the natural antibacterial mosquito-repellent microcapsules are arranged on the modified natural antibacterial fabric, the natural antibacterial mosquito-repellent fabric is prepared, and the natural antibacterial mosquito-repellent fabric has a good antibacterial effect and a good mosquito-repellent effect at the same time, and is long in acting time, green, environmentally friendly, safe and efficient.

Description

Technical Field

[0001] The invention relates to the field of functional textile fabrics, and in particular to a natural antibacterial and mosquito-proof fabric and a preparation method thereof. Background Art

[0002] In the hot summer, the number of mosquitoes increases, bringing many inconveniences to people's lives. Mosquito bites not only bring health risks, but also cause discomfort symptoms such as skin itching, redness, swelling, and pain, affecting people's quality of life. Especially for sensitive groups such as infants, pregnant women, and the elderly, mosquito bites may cause more serious skin reactions. Mosquitoes are the vectors of many diseases, such as malaria, dengue fever, encephalitis, yellow fever, etc. These diseases pose a serious threat to human health worldwide. Especially in tropical and subtropical areas, mosquitoes breed and reproduce rapidly, and the risk of disease transmission is higher.

[0003] Traditional mosquito repellent methods, such as mosquito coils, electric mosquito coil liquid, mosquito repellent spray, etc., have certain mosquito repellent effects, but they also have some shortcomings. For example, mosquito coils produce smoke and odor when burning, which may irritate the human respiratory tract; electric mosquito coil liquid needs to be plugged in, which has certain safety hazards and cannot be used outdoors; mosquito repellent spray has a short effective time and needs to be sprayed frequently. In contrast, mosquito repellent textiles have the advantages of easy use, long duration, and high safety, which better meet consumers' demand for healthy and safe mosquito repellent methods.

[0004] An ideal mosquito repellent product should have a good and long-lasting repellent effect on a variety of mosquitoes, be highly safe for the human body, be non-irritating, and be environmentally friendly. At present, many chemical synthetic substances can achieve the effect of repelling or killing mosquitoes, but due to the long-term and large-scale use of synthetic repellents, mosquitoes have become increasingly resistant to drugs, not only has the repellent effect declined year by year, but it can also cause neurological symptoms and skin damage. With the improvement of people's environmental awareness, more and more consumers tend to choose natural and environmentally friendly products. The mosquito repellent active ingredients of this type of product are derived from plant extracts, which are almost harmless to the human body and the environment, and meet consumers' preference for natural and environmentally friendly products.

[0005] In addition, increased sweating in summer increases the humidity of the skin surface, increases oil secretion and remains on the skin surface, causing bacteria and fungi to multiply, posing a threat to human health. It is of great significance to develop an antibacterial mosquito repellent fabric that can both repel mosquitoes and prevent bacterial growth. Summary of the invention

[0006] In view of the above problems and shortcomings, the purpose of the present invention is to provide a natural antibacterial and mosquito-proof fabric and a preparation method thereof. The fabric can repel mosquitoes and has a good antibacterial effect, which can provide more effective protection for people who are often outdoors in summer.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for preparing a natural antibacterial and mosquito-proof fabric comprises the following preparation steps: S1: preparing natural antibacterial and anti-mosquito microcapsules; the core material of the natural antibacterial and anti-mosquito microcapsules is composed of citronella essential oil, eucalyptus essential oil and peppermint essential oil in a mass ratio of 2-3:1-2:1-2; S2: modifying the natural antibacterial fiber fabric with chitosan quaternary ammonium salt to obtain a modified natural antibacterial fabric; S3: The natural antibacterial and mosquito-proof microcapsules prepared in S1 are arranged on the modified natural antibacterial fabric of S2 to obtain the natural antibacterial and mosquito-proof fabric.

[0008] Preferably, the natural antibacterial and mosquito-proof microcapsules in step S1 are single-walled or double-walled microcapsules. The wall material of the single-walled natural antibacterial and mosquito-proof microcapsules is gum arabic / gelatin; the first layer of the wall material of the double-walled natural antibacterial and mosquito-proof microcapsules is gum arabic / gelatin, and the second layer of the wall material is β-cyclodextrin.

[0009] The method for preparing the above-mentioned natural antibacterial and mosquito-repellent microcapsules comprises the following steps: (1) Preparation of single-walled antibacterial and mosquito repellent microcapsules Firstly, citronella essential oil, eucalyptus leaf essential oil and peppermint essential oil are compounded to obtain compound essential oil; Secondly, 2% mass concentration of gum arabic aqueous solution and gelatin aqueous solution were prepared respectively, placed in a 50°C constant temperature water bath and stirred evenly; Next, a certain amount of compound essential oil and emulsifier Tween-80 were weighed, added into the gum arabic aqueous solution, and an emulsifying homogenizer was used for high-speed shearing to obtain an emulsion; Next, the gelatin aqueous solution was slowly added dropwise to the emulsified system, and magnetic stirring was performed for 10 min. The pH value of the system was adjusted to 4-5 with 0.1 mol / L acetic acid, and the magnetic stirring reaction was continued for 30 min. After the reaction, the system temperature was lowered to 10°C, and gelation was performed for 20 min. The temperature was raised to 30°C, and the pH value of the system was adjusted to 9-10 with 10% NaOH solution. A 25% glutaraldehyde solution was added dropwise under magnetic stirring for curing for 2 h. The cured microcapsule solution was filtered, washed, and dried with a spray dryer to obtain a single-walled antibacterial and mosquito repellent microcapsule powder. (2) Preparation of double-walled antibacterial and mosquito repellent microcapsules Prepare a 2% β-cyclodextrin aqueous solution, place it in a constant temperature water bath at 60℃ and stir evenly, weigh a certain amount of the prepared single-walled antibacterial and mosquito repellent microcapsule powder, gradually add it to the β-cyclodextrin aqueous solution, disperse it evenly, and stir it magnetically for 1.5~2.5 h; after that, place the mixed solution in a refrigerator at 4℃, cool it for 24 h, filter and wash it, and then dry it with a spray dryer to obtain double-walled antibacterial and mosquito repellent microcapsule powder.

[0010] Furthermore, in the preparation method of the above-mentioned natural antibacterial and mosquito-proof microcapsules, the mass ratio of gum arabic to gelatin is: 1:1.1~1:1.2, the core-wall ratio (core material to double-layer wall material ratio) is 1:2~1:3, the mass ratio of gelatin+sodium alginate:β-cyclodextrin is 1:1~2, the amount of emulsifier is: 1%~2%, the shear speed of the emulsifying homogenizer is 8000 r / min, and the emulsification time is 3~5 min.

[0011] The double-walled microcapsules prepared by the present invention can slow down the sustained release speed of effective substances compared with single-walled microcapsules, so that they can be long-lasting and effective on textiles. The three essential oils of the prize-winning citronella essential oil, eucalyptus leaf essential oil and peppermint essential oil are compounded in a certain proportion to have both mosquito repellent effect and antibacterial effect. The microcapsules prepared by the present invention can be arranged on textiles to give clothes a dual effect.

[0012] Preferably, the modified natural antibacterial fabric described in step S2 is prepared by: preparing a chitosan quaternary ammonium salt solution with a concentration of 20 g / L, soaking the natural antibacterial fiber fabric therein, and maintaining a certain temperature for modification; taking out the soaked natural antibacterial fiber fabric, first drying it, and then baking it at a high temperature to obtain the modified natural antibacterial fabric.

[0013] Further preferably, the modified natural antibacterial fiber fabric has a modification temperature of 50-60°C, a modification time of 1-2h, a drying temperature of 100-120°C, a drying time of 3-5 min, a baking temperature of 130-140°C, and a baking time of 70-90s.

[0014] Further preferably, the natural antibacterial fiber fabrics include hemp fiber fabrics, apocynum fiber fabrics, ramie fiber fabrics, bamboo fiber fabrics and fabrics combined with any two or more of these fibers.

[0015] The natural antibacterial fiber fabric itself has a certain antibacterial effect. After being modified with chitosan quaternary ammonium salt, the antibacterial effect is improved. After being finished with mosquito repellent microcapsules, the antibacterial effect is further improved, thus preparing a natural antibacterial mosquito-proof fabric with excellent antibacterial effect. In addition, the surface of this type of fiber is relatively rough and has natural holes, which makes it easier for the modifier and microcapsules to enter the fiber and firmly adhere to the inside of the fiber, thereby improving the washability of the natural antibacterial mosquito-proof fabric.

[0016] Preferably, the finishing method of the modified natural antibacterial fabric described in step S3 is: mixing the prepared natural antibacterial mosquito repellent microcapsules with an adhesive to prepare a finishing liquid, double-dipping and double-rolling the modified natural antibacterial fabric, and drying to obtain a natural antibacterial mosquito repellent fabric.

[0017] Further preferably, the finishing liquid is composed of 20-40% natural antibacterial mosquito repellent microcapsules, 30-50% adhesive, and the balance is distilled water in weight percentage.

[0018] More preferably, the adhesive is a polyurethane adhesive.

[0019] More preferably, the drying temperature is 80-90° C., the drying time is 3-5 min, the baking temperature is 110-130° C., and the baking time is 70-90 s.

[0020] The beneficial effects of the present invention are: (1) The active ingredients of the antibacterial mosquito repellent microcapsules prepared by the present invention are derived from natural plants and are almost harmless to the human body and the environment. Compared with synthetic mosquito repellents, they are more in line with consumers' preference for natural and environmentally friendly products. The selected plant essential oils have both mosquito repellent effects and antibacterial effects. The three essential oils are compounded to have a synergistic effect and a certain aromatic smell that can relieve people's anxiety in summer and cheer up their mood.

[0021] (2) The prepared antibacterial and mosquito repellent microcapsules are double-walled microcapsules, which can prevent the effective ingredients from being lost too quickly and reduce their sustained release rate. The finished fabrics can have long-lasting antibacterial and mosquito repellent effects and have a wide range of application scenarios.

[0022] (3) Using natural antibacterial fiber fabric as the base fabric, it is modified with chitosan quaternary ammonium salt solution to enhance its antibacterial effect, and then finished with double-walled antibacterial mosquito repellent microcapsules. The triple effect makes the prepared natural antibacterial mosquito repellent fabric have excellent antibacterial effect. Based on the structural characteristics of the rough surface and natural holes of natural antibacterial fiber, the prepared natural antibacterial mosquito repellent fabric has a long-lasting antibacterial and mosquito repellent effect, is washable, and is resistant to friction. DETAILED DESCRIPTION

[0023] The present invention is further described below. The following examples are only used to more clearly illustrate the technical solution of the present invention, and are not intended to limit the protection scope of the present invention. Example 1

[0024] S1. Preparation of natural antibacterial and mosquito repellent microcapsules (1) Compounding citronella essential oil, eucalyptus leaf essential oil, and peppermint essential oil in a mass ratio of 2:1:1 to obtain a composite essential oil; (2) Prepare 1% mass concentration of gum arabic aqueous solution and gelatin aqueous solution respectively, place in a 50°C constant temperature water bath and stir evenly; (3) Weigh 5 parts of compound essential oil and 7.5 parts of Tween-80, add them to 240 parts of gum arabic aqueous solution, and use an emulsifying homogenizer to shear for 3 minutes at 8000r / min to obtain an emulsion; slowly add 265 parts of gelatin aqueous solution to the emulsified system, stir magnetically for 10 minutes, adjust the pH value of the system to 4-5 with 0.1 mol / L acetic acid, and continue to react with magnetic stirring for 30-50 minutes; after the reaction, lower the system temperature to 10°C, adjust the pH value of the system to 9-10 with 10% NaOH solution, and add 0.5 parts of 25% glutaraldehyde solution under magnetic stirring for solidification; filter and wash the solidified microcapsule solution, and then dry it with a spray dryer to obtain a single-walled antibacterial and mosquito repellent microcapsule powder; (4) Prepare 260 parts of 2% β-cyclodextrin aqueous solution, place it in a constant temperature water bath at 60°C and stir evenly, weigh 10 parts of the prepared single-walled antibacterial and mosquito repellent microcapsule powder, gradually add it to the β-cyclodextrin aqueous solution, disperse it evenly, and stir it magnetically for 1.5 to 2.5 hours. After the mixture is placed in a refrigerator at 4°C, cool it for 24 hours, filter it, wash it, and then dry it with a spray dryer to obtain double-walled antibacterial and mosquito repellent microcapsule powder.

[0025] S2. Preparation of modified natural antibacterial fabric A chitosan quaternary ammonium salt solution with a concentration of 20 g / L was prepared, and the natural flax fiber fabric was immersed in it and kept at 50°C for 2 hours for modification; after the modification, it was first baked at 100°C for 5 minutes and then baked at 140°C for 70 seconds to obtain the modified flax fiber fabric.

[0026] S3. Preparation of natural antibacterial and mosquito-proof fabric (1) 3 parts of the double-walled antibacterial and mosquito repellent microcapsules prepared in step S1 and 3 parts of an aqueous polyurethane adhesive are added with 94 parts of distilled water to prepare a finishing liquid; (2) The modified flax fiber fabric obtained in step S2 is double dipped and double rolled with a finishing liquid, the rolling roller pressure is 0.2 MPa, and the fabric is baked at 80°C for 5 min and at 120°C for 90 s to obtain a natural antibacterial and mosquito-proof fabric. Example 2

[0027] S1. Preparation of natural antibacterial mosquito repellent microcapsules: same as Example 1.

[0028] S2. Preparation of modified natural antibacterial fabric A quaternary ammonium salt solution of chitosan with a concentration of 20 g / L was prepared, and the natural hemp fiber fabric was immersed in it and kept at 50°C for 1 hour for modification; after the modification, it was baked at 100°C for 5 min and then at 140°C for 70 seconds to obtain the modified hemp fiber fabric.

[0029] S3. Preparation of natural antibacterial and mosquito-proof fabrics:

[0030] (1) 3 parts of the double-walled antibacterial and mosquito repellent microcapsules prepared in step S1 and 3 parts of an aqueous polyurethane adhesive are added with 94 parts of distilled water to prepare a finishing liquid; (2) The hemp fiber fabric obtained in step S2 is twice dipped and twice rolled with the finishing liquid, the rolling roller pressure is 0.2 MPa, and the fabric is baked at 80° C. for 5 min and at 120° C. for 90 s to obtain a natural antibacterial and mosquito-proof fabric. Example 3

[0031] S1. Preparation of natural antibacterial mosquito repellent microcapsules: same as Example 1.

[0032] S2. Preparation of modified natural antibacterial fabric A quaternary ammonium salt solution of chitosan with a concentration of 20 g / L was prepared, and the natural ramie fiber fabric was immersed in it and kept at 60°C for 1 hour for modification; after the modification, it was first baked at 110°C for 3 min and then baked at 130°C for 70 seconds to obtain the modified ramie fiber fabric.

[0033] S3. Preparation of natural antibacterial and mosquito-proof fabric (1) 4 parts of the double-walled antibacterial and mosquito repellent microcapsules prepared in step S1 and 5 parts of an aqueous polyurethane adhesive are added with 91 parts of distilled water to prepare a finishing liquid; (2) The modified ramie fiber fabric obtained in step S2 is subjected to double dipping and double rolling with a finishing liquid, the rolling roller pressure is 0.2 MPa, and the fabric is baked at 90° C. for 4 min and then at 110° C. for 90 s to obtain a natural antibacterial and mosquito-repellent fabric. Example 4

[0034] S1. Preparation of natural antibacterial mosquito repellent microcapsules: same as Example 1.

[0035] S2. Preparation of modified natural antibacterial fabric: The fabric is natural apocynum venetum fiber fabric, and the operation is the same as that in Example 1 to obtain modified apocynum venetum fiber.

[0036] S3. Preparation of natural antibacterial and mosquito-proof fabric (1) 2 parts of the double-walled antibacterial and mosquito repellent microcapsules prepared in step S1, 4 parts of an aqueous polyurethane adhesive, and 94 parts of distilled water were added to prepare a finishing liquid; (2) The modified apocynum fiber fabric obtained in step S2 is subjected to double dipping and double rolling with a finishing liquid, the rolling roller pressure is 0.2 MPa, the fabric is baked at 80° C. for 5 min, and then baked at 130° C. for 70 s to obtain a natural antibacterial and mosquito-proof fabric. Example 5

[0037] S1. Preparation of natural antibacterial mosquito repellent microcapsules: same as Example 1.

[0038] S2. Preparation of modified natural antibacterial fabric A chitosan quaternary ammonium salt solution with a concentration of 20 g / L was prepared, and the natural bamboo fiber fabric was immersed in it and kept at 60°C for 1 hour for modification; after the modification, it was baked at 120°C for 3 min and then at 130°C for 90 seconds to obtain the modified bamboo fiber fabric.

[0039] S3. Preparation of natural antibacterial and mosquito-proof fabric (1) 4 parts of the double-walled antibacterial and mosquito repellent microcapsules prepared in step S1 and 4 parts of an aqueous polyurethane adhesive are added with 92 parts of distilled water to prepare a finishing liquid; (2) The modified bamboo fiber fabric obtained in step S2 is twice dipped and twice rolled with a finishing liquid, the rolling roller pressure is 0.2 MPa, and the fabric is baked at 90° C. for 35 min and then at 120° C. for 90 s to obtain a natural antibacterial and mosquito-repellent fabric. Example 6

[0040] S1. Preparation of natural antibacterial and mosquito repellent microcapsules The three essential oils, citronella essential oil, eucalyptus essential oil and peppermint essential oil, are compounded in a mass ratio of 1:2:1 to obtain a composite essential oil; the other steps are the same as step S1 of the embodiment; S2. Preparation of modified natural antibacterial fabric: same as in Example 2; S3. Preparation of natural antibacterial and mosquito-proof fabric: same as in Example 2. Example 7

[0041] S1. Preparation of natural antibacterial and mosquito repellent microcapsules The three essential oils, citronella essential oil, eucalyptus essential oil and peppermint essential oil, are compounded in a mass ratio of 1:1:2 to obtain a composite essential oil; the other steps are the same as step S1 of the embodiment; S2. Preparation of modified natural antibacterial fabric: same as in Example 2; S3. Preparation of natural antibacterial and mosquito-proof fabric: same as in Example 2. Example 8

[0042] S1. Preparation of natural antibacterial and mosquito repellent microcapsules The three essential oils, citronella essential oil, eucalyptus essential oil and peppermint essential oil, are compounded in a mass ratio of 4:1:1 to obtain a composite essential oil; the other steps are the same as step S1 of the embodiment; S2. Preparation of modified natural antibacterial fabric: same as in Example 2; S3. Preparation of natural antibacterial and mosquito-proof fabric: same as in Example 2. Comparative Example 1

[0043] S1. Preparation of natural antibacterial and mosquito repellent microcapsules The preparation method of single-walled antibacterial mosquito repellent microcapsule powder is the same as that of Example 1; S2. Preparation of modified natural antibacterial fabric: same as in Example 2; S3. Preparation of natural antibacterial and mosquito-proof fabric: same as in Example 2.

[0044] (1) 3 parts of the single-walled antibacterial and mosquito repellent microcapsules prepared in step S1 and 3 parts of an aqueous polyurethane adhesive are added with 94 parts of distilled water to prepare a finishing liquid; (2) Same as Example 2. Comparative Example 2

[0045] The essential oil used in this comparative example is 5 parts of citronella essential oil, and the other steps are the same as those in Example 2. Comparative Example 3

[0046] The essential oil used in this comparative example is 5 parts of eucalyptus leaf essential oil, and the other steps are the same as in Example 2. Comparative Example 4

[0047] The essential oil used in this comparative example is 5 parts of peppermint essential oil, and the other steps are the same as in Example 2. Comparative Example 5

[0048] S1. Preparation of natural antibacterial mosquito repellent microcapsules: same as Example 1.

[0049] S2. Preparation of natural antibacterial and mosquito-proof fabric (1) The preparation of the finishing liquid is the same as in Example 1; (2) The cotton fabric was double dipped and double rolled with the finishing liquid, the rolling roller pressure was 0.2 MPa, and the fabric was baked at 80°C for 5 min and at 120°C for 90 s to obtain a natural antibacterial and mosquito repellent fabric. Comparative Example 6

[0050] S1. Preparation of natural antibacterial mosquito repellent microcapsules: same as Example 1.

[0051] S2. Preparation of natural antibacterial and mosquito-proof fabric (1) The preparation of the finishing liquid is the same as in Example 1; (2) The natural hemp fiber fabric was double-dipped and double-rolled with a finishing liquid, the roller pressure was 0.2 MPa, the fabric was baked at 80°C for 5 min, and then baked at 120°C for 90 s to obtain a natural antibacterial and mosquito-repellent fabric.

[0052] Performance Testing Washing method: Wash according to GB / T 12490-2007 "Textiles - Tests for colour fastness - Colour fastness to domestic and commercial washing".

[0053] Antibacterial performance: According to GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Oscillation method", the antibacterial properties of the fabric were quantitatively tested. Its antibacterial properties against Staphylococcus aureus (ATCC 6538), a Gram-positive bacterium, Escherichia coli (ATCC 11229), a Gram-negative bacterium, and Candida albicans (ATCC 10231) were tested.

[0054] Mosquito repellent effect: According to the repellent method in GB / T 30126—2013 "Detection and evaluation of mosquito repellent properties of textiles", the mosquito repellent properties of the fabric were evaluated by the repellent rate: P>70% was rated as Grade A (with extremely strong repellent effect); 50%<P<70 was rated as Grade B (with good repellent effect), and 30%<P<50% was rated as Grade C (with repellent effect).

[0055] Table 1 Antibacterial test results

[0056] As can be seen from Table 1, after finishing with double-walled antibacterial and mosquito repellent microcapsules, the antibacterial performance was further improved. The inhibition rates against the three kinds of bacteria could all reach over 90%, and the inhibition rates against the two kinds of bacteria even reached over 95%. The antibacterial effect of the unmodified natural antibacterial fiber fabric directly finished with double-walled antibacterial and mosquito repellent microcapsules was not as good as that after modification and then finishing. The antibacterial effect of finishing cotton fiber, which does not have antibacterial effect itself, with double-walled antibacterial and mosquito repellent microcapsules was not as good as that of the natural antibacterial fiber fabric after finishing. The effect of finishing the modified natural antibacterial fiber fabric with double-walled antibacterial and mosquito repellent microcapsules prepared with a single essential oil as the core material was not as good as that of the double-walled antibacterial and mosquito repellent microcapsules prepared with a compound essential oil as the core material, indicating that there was a synergistic effect among the three essential oils. Reducing the proportion of citronella essential oil in the compound essential oil would slightly decrease the antibacterial effect, and further increasing its proportion would not significantly enhance the antibacterial effect.

[0057] Table 2 Comparison of washing antibacterial rates of fiber fabrics before and after modification and after finishing

[0058] As can be seen from Table 2, the natural antibacterial fiber fabric itself has a certain antibacterial effect on Escherichia coli, Staphylococcus aureus and Candida albicans, but the antibacterial performance is weak. After the chitosan quaternary ammonium salt modification, its antibacterial performance is significantly improved, and the inhibition rate of the three bacteria can reach more than 85%. Because the natural antibacterial fiber surface is relatively rough, there are certain natural cavities and grooves and other structures, so that the chitosan quaternary ammonium salt finishing agent can go deep into the fiber interior, combined with the fiber group, so that the modified natural antibacterial fiber fabric after washing, the antibacterial effect does not decline rapidly, and has strong water washing resistance. And the double-walled antibacterial microcapsules can also be firmly assembled with the fiber due to the rough structure of the fiber surface, and the modified natural antibacterial fiber fabric after its arrangement is washed, and the antibacterial effect declines slowly. But as can be seen from Comparative Example 5, because the microcapsules it arranges are single-walled microcapsules, after washing, the capsule wall is more easily broken than the double-walled structure, and the antibacterial performance declines slightly faster.

[0059] The natural antibacterial mosquito repellent fiber fabrics prepared in the above embodiments and comparative examples and unmodified and unfinished natural antibacterial fiber fabrics (flax, hemp, ramie, apocynum and bamboo fiber) were tested for mosquito repellent effect. The repellency rate of the unmodified and unfinished natural antibacterial fiber fabrics was less than 30%, and they did not have a mosquito repellent effect. The specific results are shown in Table 3.

[0060] Table 3 Mosquito repellent test results

[0061] It can be seen from the repellent test results in Table 3 that the prepared natural antibacterial mosquito repellent fabric has a good repellent effect on mosquitoes. After 10 and 20 times of washing, the repellent effect decreases slowly. In Comparative Examples 2-4, due to the use of a single essential oil as the core material, the mosquito repellent effect of the finished fabric is poorer than that of the fabric finished with the compound essential oil as the core material. The single-walled antibacterial mosquito repellent microcapsules have poor water washing resistance. Reducing the proportion of citronella essential oil in the compound essential oil will reduce the mosquito repellent effect of the fabric, and further increasing its proportion will not significantly enhance the mosquito repellent effect.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a natural antibacterial and mosquito-proof fabric, characterized in that: The method comprises the following preparation steps: S1. Prepare natural antibacterial and mosquito-proof microcapsules; the core material of the natural antibacterial and mosquito-proof microcapsules is composed of citronella essential oil, eucalyptus essential oil and peppermint essential oil in a mass ratio of 2-3:1-2:1-2; S2, performing chitosan quaternary ammonium salt modification treatment on the natural antibacterial fiber fabric to obtain a modified natural antibacterial fabric; S3, the natural antibacterial and mosquito-proof microcapsules prepared in S1 are arranged on the modified natural antibacterial fabric of S2 to obtain the natural antibacterial and mosquito-proof fabric.

2. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 1, characterized in that: The natural antibacterial and mosquito-proof microcapsules described in step S1 are single-walled natural antibacterial and mosquito-proof microcapsules or double-walled natural antibacterial and mosquito-proof microcapsules; the wall material of the single-walled natural antibacterial and mosquito-proof microcapsules is gum arabic / gelatin; the first layer wall material of the double-walled natural antibacterial and mosquito-proof microcapsules is gum arabic / gelatin, and the second layer wall material is β-cyclodextrin.

3. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 1 or 2, characterized in that: The method for preparing the natural antibacterial and mosquito-proof microcapsules comprises the following steps: (1) Preparation of single-walled antibacterial and mosquito repellent microcapsules Compounding citronella essential oil, eucalyptus leaf essential oil and peppermint essential oil to obtain composite essential oil; Prepare 1% mass concentration of gum arabic aqueous solution and gelatin aqueous solution respectively, place in a 50℃ constant temperature water bath and stir evenly; Weigh a certain amount of compound essential oil and emulsifier Tween-80, add them into the gum arabic aqueous solution, and use an emulsifying homogenizer to shear at high speed to obtain an emulsion; The gelatin aqueous solution was slowly added dropwise to the emulsified system, and magnetic stirring was performed for 10 min. The pH value of the system was adjusted to 4-5 with 0.1 mol / L acetic acid, and the magnetic stirring reaction was continued for 30 min. After the reaction, the system temperature was lowered to 10°C, and gelation was performed for 20 min. The temperature was raised to 30°C, and the pH value of the system was adjusted to 9-10 with 10% NaOH solution. Under magnetic stirring, 25% glutaraldehyde solution was added dropwise to solidify for 2 h. The solidified microcapsule solution was filtered and washed, and then dried with a spray dryer to obtain a single-walled antibacterial and mosquito repellent microcapsule powder. (2) Preparation of double-walled antibacterial and mosquito repellent microcapsules Prepare a 2% β-cyclodextrin aqueous solution, place it in a constant temperature water bath at 60℃ and stir evenly, weigh a certain amount of the prepared single-walled antibacterial and mosquito repellent microcapsule powder, gradually add it to the β-cyclodextrin aqueous solution, disperse it evenly, and stir it magnetically for 1.5~2.5 h; after that, place the mixed solution in a refrigerator at 4℃, cool it for 24 h, filter and wash it, and then dry it with a spray dryer to obtain double-walled antibacterial and mosquito repellent microcapsule powder.

4. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 3, characterized in that: The mass ratio of gum arabic to gelatin in step (1) is 1:1.1-1.2; the core-wall ratio is 1:2-1:3, the mass ratio of the total mass of gelatin and sodium alginate to β-cyclodextrin is 1:1-2, the amount of emulsifier is 1%-2%, the shear speed of the emulsifying homogenizer is 8000 r / min, and the emulsification time is 3-5 min; and / or, in step (2), the mass ratio of the single-walled antibacterial and mosquito repellent microcapsules to the β-cyclodextrin aqueous solution is 1:

25.

5. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 1, characterized in that: The modified natural antibacterial fabric described in step S2 is prepared by the following method: prepare a chitosan quaternary ammonium salt solution with a concentration of 20 g / L, soak the natural antibacterial fiber fabric in it, and keep it at 50-60°C for 1-2 hours for modification; take out the soaked natural antibacterial fiber fabric, first dry it at a temperature of 100-120°C for 3-5 min, and then bake it at a temperature of 130-140°C for 70-90s to obtain the modified natural antibacterial fabric.

6. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 1, characterized in that: Natural antibacterial fiber fabrics include hemp fiber fabrics, apocynum fiber fabrics, ramie fiber fabrics, bamboo fiber fabrics and combination fabrics of any two or more fibers.

7. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 1, characterized in that: The finishing method of the modified natural antibacterial fabric described in step S3 is: mixing the prepared natural antibacterial mosquito repellent microcapsules with an adhesive to prepare a finishing liquid, double-dipping and double-rolling the modified natural antibacterial fabric, and drying to obtain a natural antibacterial mosquito repellent fabric.

8. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 7, characterized in that: The finishing liquid is composed of 20-40% natural antibacterial mosquito repellent microcapsules, 30-50% adhesive, and the remainder is distilled water in terms of weight percentage.

9. The method for preparing the natural antibacterial and mosquito-proof fabric according to claim 7, characterized in that: The roller pressure of the rolling mill is 0.15-0.25Mpa, the drying temperature is 80-90°C, the drying time is 3-5 minutes, the baking temperature is 110-130°C, and the baking time is 70-90 seconds.

10. The natural antibacterial and mosquito-proof fabric obtained by the preparation method of the natural antibacterial and mosquito-proof fabric according to any one of claims 1 to 9.

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