Cool-feeling mosquito-repelling microcapsule as well as preparation method and application thereof

Abstract

The invention relates to the technical field of functional finishing agents, and particularly discloses a cool-feeling mosquito-repelling microcapsule and a preparation method and application thereof.Regenerated silk fibroin / Arabic gum serves as a wall material, combined plant essential oil serves as a core material, the cool-feeling mosquito-repelling microcapsule is prepared through a spray drying method, and fabric is subjected to after-finishing application in a padding mode. The finished fabric has the effects of cool feeling and mosquito repelling at the same time, and compared with a traditional method of independently carrying out cool feeling and mosquito repelling finishing in two steps, the process steps are greatly shortened, and the process time is greatly shortened. The fabric finished by the cool-feeling mosquito-repelling microcapsules is good in cool feeling and mosquito-repelling effect and lasting in effect, the mosquito repelling rate can still reach 80% or above after the fabric is washed with water five times, and the fabric has the contact cool feeling performance and can meet the use requirements of people for clothes in summer.

Description

Technical Field

[0001] The invention relates to the technical field of functional finishing agents, and in particular to a cool mosquito repellent microcapsule and a preparation method and application thereof. Background Art

[0002] As people's living standards improve, the functional requirements for textiles are becoming increasingly diversified and refined. In the hot summer, people expect the clothes they wear to not only have good breathability and comfort, but also bring a cool touch to relieve the discomfort caused by the high temperature. At the same time, mosquito bites often cause trouble to people's outdoor activities and rest, so fabrics with mosquito repellent functions have also attracted much attention.

[0003] Summer clothing is mostly made of cotton or synthetic fibers. Cotton fibers have good moisture absorption, soft texture and skin-friendly texture, but it is often difficult to evaporate quickly after absorbing sweat, which makes people feel stuffy. Fabrics made of synthetic fibers often have poor air permeability, and they feel stuffy when worn, which is not conducive to the dissipation of heat and the evaporation of sweat, and it is difficult to bring a comfortable cool experience to the user. In terms of mosquito repellent function, existing mosquito repellent products are mostly in the form of smear-type mosquito repellents or mosquito coils. These products have problems such as inconvenience in use, short duration, and possible irritation to the skin. Directly giving the mosquito repellent function to the fabric can achieve a continuous mosquito repellent effect without affecting people's normal activities.

[0004] In addition, the existing cooling fabrics and mosquito repellent fabrics are often prepared independently during the preparation process, lacking an effective method to organically combine cooling technology with mosquito repellent technology, making it difficult to simultaneously meet consumers' dual needs for cool and comfortable summer fabrics and effective mosquito repellent. Therefore, developing a fabric that can have both good cooling performance and efficient mosquito repellent function with stable and long-lasting performance has important practical significance and market prospects. Summary of the invention

[0005] In view of the above problems and shortcomings, the purpose of the present invention is to provide a method for preparing functional microcapsules with both cooling and mosquito repellent effects, which can be used for finishing of textile fabrics, so that the fabrics can have both cooling and mosquito repellent effects after one finishing.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A cool mosquito repellent microcapsule, which uses regenerated silk fibroin and gum arabic as wall materials and plant essential oil as core material.

[0008] Furthermore, the mass ratio of the regenerated silk fibroin to gum arabic is 1:0.4-0.6.

[0009] Furthermore, the plant essential oil is a composition of peppermint essential oil and one of citronella essential oil, eucalyptus leaf essential oil, schizonepeta essential oil, wormwood essential oil, patchouli essential oil and lavender essential oil.

[0010] Peppermint essential oil contains menthol, menthone and other main ingredients, among which menthol is the key substance that produces a cool feeling, which can stimulate the skin and respiratory tract and produce a cool feeling. At the same time, peppermint essential oil is volatile, and the essential oil needs to absorb heat to transform from liquid to gas. The heat of the surrounding environment is absorbed for its state transformation, thereby producing a local cool feeling on the skin surface. In addition, peppermint essential oil also has the effect of repelling mosquitoes, and can achieve a synergistic effect when combined with other mosquito repellent plant essential oils.

[0011] Furthermore, the mass ratio of peppermint essential oil to another essential oil in the core material is 2:1.

[0012] Furthermore, the mass ratio of the wall material to the core material is 2:1.

[0013] Furthermore, the preparation steps of the cool feeling mosquito repellent capsule include:

[0014] The wall material aqueous solution is prepared, and an emulsifier and a core material are added, and the mixture is homogenized by an emulsifying homogenizer to form a stable O / W type emulsion, and the emulsion is spray-dried to obtain a cool mosquito repellent microcapsule.

[0015] Furthermore, the concentration of the wall material aqueous solution is 8wt% to 10wt%.

[0016] Furthermore, the emulsifier is Tween-60.

[0017] Furthermore, the amount of the emulsifier is 4-6% of the core material weight.

[0018] Furthermore, the regenerated silk fibroin is prepared from discarded silk, and the preparation method thereof is as follows:

[0019] S1.1 Degumming: Clean the waste silk and cut it into small pieces, boil it in a 0.5wt% Na2CO3 solution with a bath ratio of 1:50 for 30 minutes, filter it, wash it with distilled water, repeat the above operation once, and dry it in a fume hood overnight to obtain the degummed pure silk fibroin;

[0020] S1.2 Dissolution of silk fibroin: prepare a mixed solution of CaCl2:H2O:C2H5OH=1:8:2 (molar ratio), place the pure silk fibroin obtained after degumming into the mixed solution, heat and stir in a water bath to dissolve, and obtain a silk fibroin-CaCl2 solution;

[0021] S1.3 Dialysis: Pour the silk fibroin-CaCl2 solution into a dialysis bag and dialyze with distilled water at room temperature. Replace the dialysate at 1, 2, 4, 6, 8, 12, 24, 36 and 48 hours. Perform the dialysis for two days to obtain the silk fibroin solution.

[0022] S1.4 Freeze drying: Freeze the silk fibroin solution at -80°C for 24 hours, and then freeze dry it at -55°C or below for 48 hours to obtain regenerated silk fibroin.

[0023] Silk fibroin has good thermal conductivity. The β-pleated sheet structure in its molecular structure is relatively regular, and this orderly structure is conducive to the rapid transfer of heat. When the skin comes into contact with materials containing silk fibroin, the heat of the human body can be quickly transferred out through the silk fibroin, thus producing a cool feeling. Secondly, silk fibroin has good hygroscopicity. As a microcapsule wall material, the microcapsules can absorb sweat from the skin surface after being arranged on the surface of the fabric, and evaporate on the surface of the fabric, taking away a lot of heat.

[0024] Furthermore, during the dissolution of silk fibroin, the water bath temperature is 60°C to 80°C, the bath ratio is 1:10, and the heating time is 4 to 5 hours.

[0025] Furthermore, during the dialysis process, the molecular weight cutoff of the dialysis bag is 5kD to 8kD.

[0026] The cool mosquito repellent microcapsules prepared above are used to prepare cool mosquito repellent fabrics, and the steps are as follows: preparing a cool mosquito repellent microcapsule finishing liquid, impregnating the fabric, and drying to obtain a cool mosquito repellent fabric.

[0027] Furthermore, the cool feeling mosquito repellent microcapsule finishing liquid is composed of 3wt% to 5wt% of cool feeling mosquito repellent microcapsules, 4wt% to 6wt% of waterborne polyurethane, 0.5wt% to 0.8wt% of dispersant, 0.2wt% to 0.3wt% of softener, and the balance is water.

[0028] Furthermore, the rolling rate is 70% to 80%; and the rolled fabric is dried at 70 to 80°C.

[0029] The beneficial effects of the present invention are:

[0030] (1) The present invention provides a method for preparing functional microcapsules having both cooling and mosquito repellent effects, which can be used for the post-finishing of textile fabrics. The fabrics can have both cooling and mosquito repellent effects after one finishing step. Compared with the traditional method of performing cooling and mosquito repellent finishing in two independent steps, the process steps and time are greatly shortened.

[0031] (2) The fabrics treated with the cool mosquito repellent microcapsules provided by the present invention have good cool feeling and mosquito repellent effect, and the effect is long-lasting. After being washed 5 times, the mosquito repellent effect can still reach the A-level repellent effect in the national standard, and they also have a cool contact performance, which can meet people's demand for the use of such clothing in summer.

[0032] (3) The raw materials used in the present invention are all natural raw materials. The finished fabrics are safe and non-irritating to the skin and are soft, skin-friendly and smooth. DETAILED DESCRIPTION

[0033] 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.

[0034] Example 1

[0035] S1. Preparation of regenerated silk fibroin

[0036] (1) Degumming: The waste silk was cleaned and cut into small pieces, placed in a 0.5 wt% Na2CO3 solution with a bath ratio of 1:50 and boiled for 30 min, filtered, washed with distilled water, and the above operation was repeated once, and dried in a fume hood overnight to obtain degummed pure silk fibroin;

[0037] (2) Dissolving silk fibroin: prepare a mixed solution of CaCl2:H2O:C2H5OH=1:8:2 (molar ratio), place the pure silk fibroin obtained after degumming in the mixed solution with a bath ratio of 1:10, heat and stir in a water bath at 70°C for 4 h to dissolve, and obtain a silk fibroin-CaCl2 solution;

[0038] (3) Dialysis: Pour the silk fibroin-CaCl2 solution into a dialysis bag with a molecular weight cutoff of 5 kD and dialyze with distilled water at room temperature. Replace the dialysate at 1, 2, 4, 6, 8, 12, 24, 36 and 48 h. Perform the dialysis for a total of two days to obtain a silk fibroin solution.

[0039] (4) Freeze drying: Freeze the silk fibroin solution at -80°C for 24 hours, and then freeze dry it at -55°C or below for 48 hours to obtain regenerated silk fibroin.

[0040] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0041] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.5 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0042] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0043] (3) adding 5 parts of combined plant essential oil and 0.2 parts of Tween-60 to 100 parts of 8% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0044] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0045] S3. Application of Cooling Mosquito Repellent Microcapsules

[0046] (1) Take 3 parts of the cool mosquito repellent microcapsules prepared in S2, 4 parts of waterborne polyurethane (F0425, Shenzhen Yoshida Chemical Co., Ltd.), 0.5 parts of dispersant (polyethylene glycol 1000, Nantong Yixun Chemical Co., Ltd.), 0.2 parts of softener (softener LS, Changzhou Meisheng Biomaterial Co., Ltd.), add 92.3 parts of distilled water and mix well to prepare a finishing liquid;

[0047] (2) The polyester fabric is subjected to double dipping and double rolling with a finishing liquid, with a rolling residue rate of 75%, and dried at 70° C. to obtain a cool mosquito repellent fabric.

[0048] Example 2

[0049] S1. Preparation of regenerated silk fibroin

[0050] (1) Degumming: The waste silk was cleaned and cut into small pieces, placed in a 0.5 wt% Na2CO3 solution with a bath ratio of 1:50 and boiled for 30 min, filtered, washed with distilled water, and the above operation was repeated once, and dried in a fume hood overnight to obtain degummed pure silk fibroin;

[0051] (2) Dissolving silk fibroin: prepare a mixed solution of CaCl2:H2O:C2H5OH=1:8:2 (molar ratio), place the pure silk fibroin obtained after degumming in the mixed solution with a bath ratio of 1:10, heat and stir in a water bath at 80°C for 4 h to dissolve, and obtain a silk fibroin-CaCl2 solution;

[0052] (3) Dialysis: Pour the silk fibroin-CaCl2 solution into a dialysis bag with a molecular weight cutoff of 6 kD and dialyze with distilled water at room temperature. Replace the dialysate at 1, 2, 4, 6, 8, 12, 24, 36 and 48 h. Perform the dialysis for a total of two days to obtain a silk fibroin solution.

[0053] (4) Freeze drying: Freeze the silk fibroin solution at -80°C for 24 hours, and then freeze dry it at -55°C or below for 48 hours to obtain regenerated silk fibroin.

[0054] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0055] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.6, respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 10%;

[0056] (2) Weighing peppermint essential oil and schizonepeta essential oil in a mass ratio of 2:1 respectively and mixing them to obtain a combined plant essential oil;

[0057] (3) adding 5 parts of combined plant essential oil and 0.3 parts of Tween-60 to 100 parts of 10% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0058] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0059] S3. Application of Cooling Mosquito Repellent Microcapsules

[0060] (1) Take 5 parts of the cool mosquito repellent microcapsules prepared in S2, 6 parts of waterborne polyurethane (F0425, Shenzhen Yoshida Chemical Co., Ltd.), 0.8 parts of dispersant (polyethylene glycol 1000, Nantong Yixun Chemical Co., Ltd.), 0.3 parts of softener (softener LS, Changzhou Meisheng Biomaterial Co., Ltd.), add 87.9 parts of distilled water and mix well to prepare a finishing liquid;

[0061] (2) The nylon fabric is subjected to double dipping and double rolling with a finishing liquid, the rolling residue rate is 70%, and the fabric is dried at 75° C. to obtain a cool mosquito repellent fabric.

[0062] Example 3

[0063] S1. Preparation of regenerated silk fibroin

[0064] (1) Degumming: The waste silk was cleaned and cut into small pieces, placed in a 0.5 wt% Na2CO3 solution with a bath ratio of 1:50 and boiled for 30 min, filtered, washed with distilled water, and the above operation was repeated once, and dried in a fume hood overnight to obtain degummed pure silk fibroin;

[0065] (2) Dissolving silk fibroin: prepare a mixed solution of CaCl2:H2O:C2H5OH=1:8:2 (molar ratio), place the pure silk fibroin obtained after degumming in the mixed solution with a bath ratio of 1:10, heat and stir in a water bath at 60°C for 5 h to dissolve, and obtain a silk fibroin-CaCl2 solution;

[0066] (3) Dialysis: Pour the silk fibroin-CaCl2 solution into a dialysis bag with a molecular weight cutoff of 8 kD and dialyze with distilled water at room temperature. Replace the dialysate at 1, 2, 4, 6, 8, 12, 24, 36 and 48 h. Perform the dialysis for a total of two days to obtain a silk fibroin solution.

[0067] (4) Freeze drying: Freeze the silk fibroin solution at -80°C for 24 hours, and then freeze dry it at -55°C or below for 48 hours to obtain regenerated silk fibroin.

[0068] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0069] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.4 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 9%;

[0070] (2) Weighing peppermint essential oil and lavender essential oil in a mass ratio of 2:1 respectively and mixing them to obtain a combined plant essential oil;

[0071] (3) adding 5 parts of combined plant essential oil and 0.3 parts of Tween-60 to 100 parts of 9% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0072] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0073] S3. Application of Cooling Mosquito Repellent Microcapsules

[0074] (1) Take 5 parts of the cool mosquito repellent microcapsules prepared in S2, 5 parts of waterborne polyurethane (F0425, Shenzhen Yoshida Chemical Co., Ltd.), 0.7 parts of dispersant (polyethylene glycol 1000, Nantong Yixun Chemical Co., Ltd.), 0.3 parts of softener (softener LS, Changzhou Meisheng Biomaterial Co., Ltd.), add 89 parts of distilled water and mix well to prepare a finishing liquid;

[0075] (2) The cotton fabric is subjected to double dipping and double rolling with the finishing liquid, the rolling residue rate is 80%, and the fabric is dried at 70° C. to obtain a cool mosquito repellent fabric.

[0076] Example 4

[0077] S1. Preparation of regenerated silk fibroin

[0078] (1) Degumming: The discarded silk was cleaned and cut into small pieces, and placed in a bath with a ratio of 1:50, 0.5 wt % Na2CO3 solution for 30 min, filter, wash with distilled water, repeat the above operation once, dry in a fume hood overnight, and obtain degummed pure silk;

[0079] (2) Dissolving silk fibroin: prepare a mixed solution of CaCl2:H2O:C2H5OH=1:8:2 (molar ratio), place the pure silk fibroin obtained after degumming in the mixed solution with a bath ratio of 1:10, heat and stir in a water bath at 65°C for 4.5 h to dissolve, and obtain a silk fibroin-CaCl2 solution;

[0080] (3) Dialysis: Pour the silk fibroin-CaCl2 solution into a dialysis bag with a molecular weight cutoff of 7 kD and dialyze with distilled water at room temperature. Replace the dialysate at 1, 2, 4, 6, 8, 12, 24, 36 and 48 h. Perform the dialysis for a total of two days to obtain a silk fibroin solution.

[0081] (4) Freeze drying: Freeze the silk fibroin solution at -80°C for 24 hours, and then freeze dry it at -55°C or below for 48 hours to obtain regenerated silk fibroin.

[0082] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0083] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.5 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 10%;

[0084] (2) respectively weighing peppermint essential oil and citronella essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0085] (3) adding 5 parts of combined plant essential oil and 0.3 parts of Tween-60 to 100 parts of 10% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0086] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0087] S3. Application of Cooling Mosquito Repellent Microcapsules

[0088] (1) Take 4 parts of the cool mosquito repellent microcapsules prepared in S2, 6 parts of waterborne polyurethane (F0425, Shenzhen Yoshida Chemical Co., Ltd.), 0.7 parts of dispersant (polyethylene glycol 1000, Nantong Yixun Chemical Co., Ltd.), 0.2 parts of softener (softener LS, Changzhou Meisheng Biomaterial Co., Ltd.), add 89.1 parts of distilled water and mix well to prepare a finishing liquid;

[0089] (2) The cotton and linen fabric is subjected to double dipping and double rolling with a finishing liquid, with a rolling residue rate of 70%, and dried at 70° C. to obtain a cool mosquito repellent fabric.

[0090] Comparative Example 1

[0091] S1. Preparation of Cooling Mosquito Repellent Microcapsules

[0092] (1) Weighing sodium alginate and gum arabic at a mass ratio of 1:0.8 respectively, mixing them, and adding water to prepare a sodium alginate / gum arabic aqueous solution with a mass concentration of 8%;

[0093] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0094] (3) adding 5 parts of combined plant essential oil and 0.2 parts of Tween-60 to 100 parts of 8% sodium alginate / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0095] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0096] S2. Application of Cooling Mosquito Repellent Microcapsules

[0097] Same as Example 1.

[0098] Comparative Example 2

[0099] S1. Preparation of regenerated silk fibroin

[0100] Same as Example 1.

[0101] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0102] (1) adding water to the weighed regenerated silk fibroin to prepare a regenerated silk fibroin aqueous solution with a mass concentration of 8%;

[0103] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0104] (3) adding 5 parts of combined plant essential oil and 0.2 parts of Tween-60 to 100 parts of 8% regenerated silk fibroin aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0105] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0106] S3. Application of Cooling Mosquito Repellent Microcapsules

[0107] Same as Example 1.

[0108] Comparative Example 3

[0109] S1. Preparation of regenerated silk fibroin

[0110] Same as Example 1.

[0111] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0112] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.5 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0113] (2) adding 5 parts of peppermint essential oil and 0.2 parts of Tween-60 to 100 parts of 8% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0114] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0115] S3. Application of Cooling Mosquito Repellent Microcapsules

[0116] Same as Example 1.

[0117] Comparative Example 4

[0118] S1. Preparation of regenerated silk fibroin

[0119] Same as Example 1

[0120] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0121] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.5 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0122] (3) adding 5 parts of eucalyptus essential oil and 0.2 parts of Tween-60 to 100 parts of 8% regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0123] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0124] S3. Application of Cooling Mosquito Repellent Microcapsules

[0125] Same as Example 1

[0126] Comparative Example 5

[0127] S1. Preparation of regenerated silk fibroin

[0128] Same as Example 1.

[0129] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0130] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.2 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0131] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0132] (3) adding 5 parts of combined plant essential oil and 0.2 parts of Tween-60 to 100 parts of 8% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0133] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0134] S3. Application of Cooling Mosquito Repellent Microcapsules

[0135] Same as Example 1.

[0136] Comparative Example 6

[0137] S1. Preparation of regenerated silk fibroin

[0138] Same as Example 1

[0139] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0140] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.8 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0141] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0142] (3) adding 5 parts of combined plant essential oil and 0.2 parts of Tween-60 to 100 parts of 8% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, homogenizing with an emulsifier homogenizer at 8000 r / min for 5 min to emulsify and form a stable O / W emulsion;

[0143] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0144] S3. Application of Cooling Mosquito Repellent Microcapsules

[0145] Same as Example 1.

[0146] Comparative Example 7

[0147] S1. Preparation of regenerated silk fibroin

[0148] Same as Example 1

[0149] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0150] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.5 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0151] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0152] (3) Add 5 parts of combined plant essential oil and 0.2 parts of Span-20 to 100 parts of 8% mass concentration of regenerated silk fibroin / gum arabic aqueous solution, and homogenize with an emulsifier homogenizer at 8000 r / min for 5 min;

[0153] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0154] S3. Application of Cooling Mosquito Repellent Microcapsules

[0155] Same as Example 1.

[0156] Comparative Example 8

[0157] S1. Preparation of regenerated silk fibroin

[0158] Same as Example 1

[0159] S2. Preparation of Cooling Mosquito Repellent Microcapsules

[0160] (1) Weighing regenerated silk fibroin and gum arabic at a mass ratio of 1:0.5 respectively, mixing them, and adding water to prepare a regenerated silk fibroin / gum arabic aqueous solution with a mass concentration of 8%;

[0161] (2) respectively weighing peppermint essential oil and eucalyptus essential oil in a mass ratio of 2:1 and mixing them to obtain a combined plant essential oil;

[0162] (3) Add 5 parts of combined plant essential oil and 0.2 parts of Span-60 to 100 parts of 8% regenerated silk fibroin / gum arabic aqueous solution, and homogenize at 8000 r / min for 5 min using an emulsifier homogenizer;

[0163] (4) spray drying the emulsion to obtain cool mosquito repellent microcapsules.

[0164] S3. Application of Cooling Mosquito Repellent Microcapsules

[0165] Same as Example 1.

[0166] Performance Testing

[0167] Washing method: Wash according to GB / T 12490-2007 "Textiles - Tests for colour fastness - Colour fastness to domestic and commercial washing".

[0168] Mosquito repellent effect: According to the repellent method in GB / T 30126—2013 "Testing and Evaluation of Mosquito Repellent Properties of Textiles", the mosquito repellent performance of fabrics is evaluated by the repellent rate: when P>70%, it is rated as Class A (with extremely strong repellent effect); when 50%<P<70%, it is rated as Class B (with good repellent effect); when 30%<P<50%, it is rated as Class C (with repellent effect).

[0169] Contact cool feeling: According to the standard GB / T 35263—2017 "Testing and Evaluation of Instant Contact Cool Feeling Performance of Textiles", the contact cool feeling coefficient q of the fabric during the contact process with the detection board is tested by using a contact cold and warm feeling tester max 。

[0170] Table 1 Test results

[0171] Example Repellency% Repellency after 5 washes % <![CDATA[q max / J / (cm 2 ·s)]]> Wash 5 times max / J / (cm 2 ·s)]]> Example 1 88.25％ 83.45％ 0.307 0.256 Example 2 92.45％ 87.15％ 0.315 0.259 Example 3 91.32％ 86.63％ 0.279 0.232 Example 4 90.56％ 84.52％ 0.285 0.235 Comparative Example 1 87.62％ 81.46％ 0.201 0.164 Comparative Example 2 89.44％ 80.26％ 0.312 0.213 Comparative Example 3 83.21％ 77.25％ 0.316 0.261 Comparative Example 4 84.72％ 79.45％ 0.258 0.206 Comparative Example 5 89.36％ 82.75％ 0.308 0.235 Comparative Example 6 88.63％ 81.94％ 0.295 0.236 Comparative Example 7 75.32％ 63.15％ 0.269 0.201 Comparative Example 8 63.24％ 51.65％ 0.263 0.192

[0172] As can be seen from Table 1, the prepared cool feeling mosquito repellent microcapsules endow the fabrics with both mosquito repellent and cool feeling functions after being finished on different fabrics. Among them, the contact cool feeling coefficients of the fabrics finished with polyester and nylon are larger, which is due to the influence of the characteristics of the fibers and the fabrics themselves. Generally speaking, after the fabrics finished with cool feeling mosquito repellent microcapsules are washed 5 times, the mosquito repellent effect can still reach Class A repellent effect in the national standard, and they all have contact cool feeling performance.

[0173] For the fabric finished with the cool feeling mosquito repellent microcapsules prepared with sodium alginate / arabic gum as the wall material in Comparative Example 1, its contact cool feeling coefficient is significantly lower than that of the fabric finished with the cool feeling mosquito repellent microcapsules prepared with regenerated silk fibroin / arabic gum as the wall material. In Comparative Example 2, when using pure regenerated silk fibroin as the wall material, the wash resistance of the finished fabric decreases. In Comparative Example 3, the contact cool feeling effect of the fabric is excellent but the mosquito repellent effect is slightly lower than that of Example 1. In Comparative Example 4, both the mosquito repellent effect and the contact cool feeling effect are lower than those of Example 1. In Comparative Examples 5 and 6, the ratio of regenerated silk fibroin and arabic gum in the wall material is adjusted. When the ratio of arabic gum is too low, the wash resistance decreases. When the ratio of arabic gum is too high, both the cool feeling performance and the wash resistance decrease. In Comparative Examples 7 and 8, the mosquito repellent and cool feeling effects of the microcapsules prepared with Span 20 and Span 60 as emulsifiers are both worse than those of Example 1, and the wash resistance is also poor, because their HLB value is relatively low, it is difficult to form a stable O / W emulsion, and the embedding rate of the microcapsules formed after spray drying is relatively low, and the morphology is irregular and easy to break.

[0174] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cool feeling mosquito repellent microcapsule, characterized in that: Regenerated silk fibroin and gum arabic are used as wall materials, and plant essential oil is used as core material.

2. The cool feeling mosquito repellent microcapsule according to claim 1, characterized in that: The mass ratio of the regenerated silk fibroin to gum arabic is 1:0.4-0.

6.

3. The cool feeling mosquito repellent microcapsule according to claim 1, characterized in that: The plant essential oil is a composition of peppermint essential oil and one of citronella essential oil, eucalyptus leaf essential oil, schizonepeta essential oil, wormwood essential oil, patchouli essential oil and lavender essential oil; the mass ratio of the peppermint essential oil to the other essential oil is 2:

1.

4. The cool feeling mosquito repellent microcapsule according to claim 1, characterized in that: The mass ratio of the wall material to the core material is 2:

1.

5. A method for preparing the cool feeling mosquito repellent microcapsule according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: preparing a wall material aqueous solution, adding an emulsifier and a core material, homogenizing with an emulsifying homogenizer, emulsifying to form a stable O / W type emulsion, spray-drying the emulsion, and preparing a cool mosquito repellent microcapsule.

6. The method for preparing the cool feeling mosquito repellent microcapsule according to claim 5, characterized in that: The concentration of the wall material aqueous solution is 8wt% to 10wt%; The emulsifier is Tween-60; The amount of the emulsifier used is 4-6% of the core material.

7. An application of the cool mosquito repellent microcapsule according to any one of claims 1 to 4, characterized in that: It is used to prepare cool mosquito repellent fabrics.

8. The use of the cool feeling mosquito repellent microcapsule as claimed in claim 7, characterized in that: The preparation of the cool mosquito repellent fabric comprises the following steps: preparing a cool mosquito repellent microcapsule finishing liquid, impregnating the fabric, and drying to obtain the cool mosquito repellent fabric.

9. The use of the cool feeling mosquito repellent microcapsule as claimed in claim 8, characterized in that: The cool feeling mosquito repellent microcapsule finishing liquid is composed of 3wt%-5wt% of cool feeling mosquito repellent microcapsules, 4wt%-6wt% of waterborne polyurethane, 0.5wt%-0.8wt% of dispersant, 0.2wt%-0.3wt% of softener, and the balance is water.