Mosquito-repelling fabric and preparation method thereof

Abstract

The invention discloses a mosquito-repellent fabric and a preparation method thereof, and belongs to the technical field of functional textiles. The mosquito-repelling fabric provided by the invention is a cloth sample treated by a mosquito-repelling microcapsule finishing agent, a mosquito-repelling microcapsule mainly comprises a core material and a shell material, and the core material is prepared by mixing permethrin, eucalyptus and schizonepeta essential oil; and the shell material is a bio-based material polylactic acid. Compared with mosquito-repelling microcapsules made of micro-plastic shell materials such as melamine resin, polyurea and polyurethane, the mosquito-repelling microcapsule provided by the invention is safer and more environment-friendly, low in toxicity and better in mosquito-repelling effect, and can be widely applied to the fields of textiles, daily chemicals, coatings, leather and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of functional textiles, and in particular to a mosquito repellent fabric and a preparation method thereof. Background Art

[0002] With the rapid development of science and technology, people's basic life needs have been greatly met, and more and more people are beginning to pursue spiritual satisfaction. Outdoor sports, as a way to relax the body and mind and please the soul, have gradually been favored by contemporary people.

[0003] However, during outdoor activities, people will inevitably come into contact with places where mosquitoes gather, such as forests and lakes, and suffer from mosquito bites. This not only causes skin discomfort and itching, but more importantly, mosquitoes carry a large number of pathogenic pathogens such as dengue fever, malaria, yellow fever, filariasis, Japanese encephalitis, etc., which seriously threaten people's health and life. Therefore, for people who love outdoor activities, a set of safe and comfortable anti-mosquito bite clothing is particularly important. Therefore, it is urgent to develop efficient and durable anti-mosquito technology.

[0004] Most traditional fabrics do not have mosquito repellent function and cannot effectively prevent and control mosquitoes. At present, there are some mosquito repellent technologies used in fabrics on the market, such as microcapsule technology, nano-resin bonding technology and melt spinning technology. However, these technologies all have certain defects.

[0005] Although nano-resin bonding technology can prevent mosquito bites to a certain extent, the effect is short-lived and it is easy to cause skin allergies; melt spinning technology not only has high technical requirements, but also has poor mosquito repellent effect; and microcapsule technology is easy to cause environmental pollution and has high cost. Therefore, there is an urgent need for a mosquito repellent technology with low toxicity, safety and environmental protection, high efficiency, good durability, low cost and better mosquito repellent effect. The patent application with application number 201911232132.6 discloses a multifunctional fabric containing mosquito repellent microcapsules and a preparation method thereof, which includes the following steps: 1) Preparation of essential oil emulsion, taking mosquito repellent aromatic essential oil, adding it to an aqueous solution of polyethylene glycol, and adding a surfactant, stirring and emulsifying at high speed to obtain a mosquito repellent aromatic essential oil emulsion. 2) Preparation of microcapsules, respectively weighing gelatin and gum arabic, adding them to distilled water, stirring until completely dissolved, preparing gelatin-gum arabic solution, adding essential oil emulsion, and then using a homogenizer to stir, emulsify, recondense, and solidify; 3) Fabric finishing, taking the prepared microcapsule emulsion, adding adhesive, water, and penetrant, stirring and dispersing evenly, using a padding method to pad the emulsion onto the fabric, baking, and drying to obtain aromatic mosquito repellent fabric. The mosquito repellent microcapsules made of gelatin and gum arabic as shell materials have poor stability and low encapsulation efficiency, and the active substances are easily lost. The mosquito repellent effect of the fabric made of the mosquito repellent microcapsules is poor and the mosquito repellent time is not long-lasting. Summary of the invention

[0006] In order to overcome the shortcomings and deficiencies of the above-mentioned technologies, the purpose of the present invention is to provide a mosquito repellent fabric and a preparation method thereof, so as to solve the problems that the traditional fabrics have short-term effects, high costs, strong toxicity, and environmental pollution.

[0007] The preparation method of the mosquito repellent fabric comprises the following steps: S1. dissolving an emulsifier in deionized water to obtain a uniform water phase; dissolving a shell material and a mosquito repellent core material in an organic solvent to obtain a uniform oil phase; S2, adding the oil phase obtained in step S1 to the water phase obtained in step S1, emulsifying under high-speed shearing to obtain a stable O / W emulsion; S3, continuously stirring the O / W emulsion obtained in step S2 at a constant temperature to obtain a mosquito repellent microcapsule emulsion; S4, dispersing the mosquito repellent microcapsule emulsion, binder and penetrant prepared in step S3 in deionized water to prepare a finishing liquid; S5. The mosquito repellent microcapsule emulsion is impregnated onto the fabric by an impregnation method, and the mosquito repellent fabric is obtained after drying.

[0008] Preferably, in step S1, the emulsifier includes styrene-maleic anhydride copolymer sodium salt, sodium dodecylbenzene sulfonate, ethylene-maleic anhydride copolymer, acyl glycinate, gum arabic powder or Tween-80.

[0009] Preferably, in step S1, the mass fraction of the emulsifier in the water phase is 3%-5%.

[0010] Preferably, in step S1, the shell material includes poly-ε-caprolactone, polylactic acid, polylactide-co-glycolic acid or polyglycolic acid.

[0011] More preferably, the polylactic acid is poly-L-lactic acid.

[0012] Preferably, in step S1, the mosquito repellent core material comprises at least one of pyrethroid, eucalyptus and plant essential oil.

[0013] Further preferably, the pyrethroid includes deltamethrin, cyfluthrin, tricyhalothrin, cis-cypermethrin, permethrin or ethomethrin.

[0014] More preferably, the plant essential oil includes citronella essential oil, thyme essential oil, peppermint essential oil, rue essential oil or schizonepeta essential oil.

[0015] Further preferably, the mass ratio of the pyrethroid, eucalyptus and plant essential oil is 0-1:0-1:0-1.

[0016] Preferably, in step S1, the organic solvent includes dichloromethane, ether or petroleum ether.

[0017] Preferably, in step S1, the mass ratio of the shell material, the mosquito repellent core material and the solvent in the oil phase is 1:1-3:4-7.

[0018] Preferably, in step S2, the mass ratio of the water phase to the oil phase is 3-5:1.

[0019] Preferably, in step S2, the emulsification conditions are: using a high shear dispersing emulsifier at 40-60°C and a rotation speed of 3000-7000 rpm for emulsification for 5-20 min.

[0020] Preferably, in step S3, the constant temperature is 30-40°C; the stirring speed is 300-500 r / min, and the stirring time is 6-10 h.

[0021] Preferably, in step S4, the mass ratio of the mosquito repellent microcapsule emulsion, the binder, the penetrant and the deionized water is 0.5-5:8-12:8-12:70-90.

[0022] Preferably, in step S4, the adhesive comprises an acrylic adhesive, a styrene-type ion exchange resin adhesive, an epoxy resin adhesive, a poly(diallyl phthalate) adhesive or a polyurethane adhesive.

[0023] Preferably, in step S4, the penetrant includes penetrant JFC, penetrant OEP-70, penetrant JFC-1 or penetrant JFC-2.

[0024] Preferably, in step S5, the fabric is immersed in the finishing liquid for 3 to 10 minutes.

[0025] Preferably, in step S5, the liquid carrying rate of the padding is 100%.

[0026] Preferably, in step S5, the drying temperature is 120-140° C. and the drying time is 60-120 s.

[0027] Compared with the prior art, the beneficial effects of the present invention are: 1. The mosquito repellent fabric provided by the present invention uses microcapsule technology to encapsulate the mosquito repellent ingredients, reducing direct contact with the skin, thereby reducing potential skin irritation or allergic reactions, and making the release of the ingredients on the fabric more lasting, thereby increasing the duration of the mosquito repellent effect.

[0028] 2. The shell material of the microcapsule of the present invention is a bio-based material. Compared with the mosquito repellent microcapsules with microplastic shell materials such as melamine resin, polyurea, and polyurethane, the mosquito repellent microcapsules provided by the present invention are safer and more environmentally friendly. In addition, the present invention uses natural mosquito repellent ingredients with low toxicity and good mosquito repellent effect, and can be widely used in textiles, daily chemicals, coatings, leather and other fields.

[0029] 3. The preparation method of the mosquito repellent fabric provided by the present invention has a relatively simple preparation process, does not require complicated equipment or technology, has low cost, and is suitable for large-scale production. DETAILED DESCRIPTION

[0030] The technical scheme of the present invention is further described below through examples. The raw materials used in the examples can be purchased from the market or prepared by conventional methods. Eucalyptus and nepeta essential oils were purchased from Jiangxi Fanglin Spice Co., Ltd.; Arabic gum, polylactic acid, dichloromethane and permethrin were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.); the binder was purchased from Shenzhen Yoshida Chemical Co., Ltd., brand 1926; the penetrant was purchased from Chuanhua Group Co., Ltd., brand JFC. In theory, other pyrethroids can also play a relative role, but permethrin has low cost and the best effect, so permethrin is selected in the examples.

[0031] Example 1 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0032] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0033] S2. Slowly add 60 g of the oil phase into 180 g of the water phase, and emulsify in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0034] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0035] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0036] S5. Select a 200*200 mm fabric (pure cotton fabric), immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0037] Example 2 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0038] Weigh 6 g of polylactic acid, 12 g of mosquito repellent core material, and 42 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0039] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0040] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0041] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0042] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0043] Example 3 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0044] Weigh 6 g of polylactic acid, 18 g of mosquito repellent core material, and 36 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0045] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0046] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0047] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0048] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0049] Example 4 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0050] Weigh 6 g of polylactic acid, 24 g of mosquito repellent core material, and 30 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0051] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0052] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0053] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0054] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0055] Example 5 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0056] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:0:0.

[0057] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0058] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0059] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0060] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0061] Example 6 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0062] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 0:1:0.

[0063] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0064] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0065] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0066] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0067] Example 7 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0068] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 0:0:1.

[0069] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0070] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0071] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0072] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0073] Example 8 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0074] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0075] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0076] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0077] S4. Weigh 3 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0078] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0079] Example 9 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0080] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0081] S2. Slowly add the oil phase into the water phase and emulsify it in a homogenizer at 50°C under high-speed shearing of 5000 r / min for 5 min to obtain a stable O / W emulsion.

[0082] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0083] S4. Weigh 5 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0084] S5. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid carrying rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0085] Example 10 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0086] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0087] S2. Slowly add 60 g of the oil phase into 180 g of the water phase, and emulsify in a homogenizer at 50 °C under high-speed shearing at 3000 r / min for 5 min to obtain a stable O / W emulsion.

[0088] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0089] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0090] S5. Select a 200*200 mm fabric (pure cotton fabric), immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0091] Embodiment 11 A mosquito repellent fabric is prepared by the following preparation method: S1. Weigh 9 g of gum arabic powder and dissolve it in deionized water. Stir magnetically at 300 r / min to prepare 180 g of an aqueous phase with an emulsifier solid content of 5%.

[0092] Weigh 10 g of polylactic acid, 10 g of mosquito repellent core material, and 40 g of dichloromethane, and stir magnetically at 300 r / min to form a uniform oil phase; the mass ratio of permethrin, eucalyptus and schizonepeta essential oil in the mosquito repellent core material is 1:1:1.

[0093] S2. Slowly add 60 g of the oil phase into 180 g of the water phase, and emulsify in a homogenizer at 50 °C under high-speed shearing at 7000 r / min for 5 min to obtain a stable O / W emulsion.

[0094] S3. After emulsification, the stable O / W emulsion is transferred to a three-necked flask, placed in a constant temperature 35 ℃ water bath and stirred at 500 r / min, and kept warm for 8 h to obtain mosquito repellent microcapsule emulsion.

[0095] S4. Weigh 1 g of mosquito repellent microcapsule emulsion, 10 g of polyurethane binder, and 10 g of penetrant JFC and disperse them in deionized water to prepare 100 g of finishing liquid.

[0096] S5. Select a 200*200 mm fabric (pure cotton fabric), immerse it in the finishing agent prepared in step S4 for 5 min, immerse and press once, with a liquid rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0097] Comparative Example 1 A mosquito repellent fabric is prepared by the following preparation method: S1. Purchase melamine resin mosquito repellent microcapsules available on the market as raw materials, weigh 5 g of melamine resin mosquito repellent microcapsules, 10 g of polyurethane binder, and 10 g of penetrant JFC, and disperse them in deionized water to prepare 100 g of finishing liquid.

[0098] S2. Select a 200*200 mm fabric, immerse it in the finishing agent prepared in step S1 for 5 min, immerse and press once, with a liquid rate of 100%, and bake it at 130°C for 90 s to obtain a mosquito repellent fabric.

[0099] Comparative Example 2 A mosquito repellent fabric is prepared by the following preparation method: purchasing mosquito repellent floral water available on the market and spraying the mosquito repellent floral water on the fabric.

[0100] Analysis and summary Since there is no testing standard for mosquito repellent in China, the test was carried out with reference to GB 13917.3-1992 "Indoor efficacy test method for registered pesticides for sanitary use - Indoor efficacy test method for small aerosols and aerosol tablets", GB 13917.1-1992 "Indoor efficacy test method for registered rural sanitary insecticides - Determination method for indoor efficacy of sprays" and GB / T 17322.10-1998 "Indoor efficacy evaluation of registered pesticides for sanitary use - repellents" drafted by the Ministry of Agriculture and Rural Affairs. The mosquitoes used in the test were all female Anopheles sinensis mosquitoes captured in the wild, and were temporarily raised in a dark room insect cage at 25℃ and relative humidity RH=70% after being captured. 100 female Anopheles sinensis mosquitoes were placed in a 60 cm×60 cm×60 cm plexiglass box. The upper surface of the plexiglass box was open and covered with a nylon mesh. The nylon mesh was provided with an opening for taking mosquitoes and 6 hand openings. The testers (all women aged 20-40 and blood type B) wore disposable latex gloves on their right hands, with a 6 cm×6 cm opening on the back of the hand. One tester (the test group to which the tester belongs was recorded as a blank test) directly put his hand into the plexiglass box from the hand opening without any treatment. The remaining 5 testers put on gloves and covered the openings of the gloves with only pretreated fabrics and mosquito repellent finishing fabrics prepared by Examples 1-9 and Comparative Examples 1-2, respectively. Each tester placed his hand in the plexiglass box for 10 min, counted the number of mosquitoes landing at the back of the hand opening, and repeated 5 times to take the average value, with at least 1 h between each test. The mosquito repellent rate was calculated by comparing the blank test (mosquito repellent rate = (number of mosquitoes dropped in the blank test - specific number of mosquitoes dropped) / number of mosquitoes dropped in the blank test).

[0101] The comparison results of the mosquito repellent fabric product indicators prepared in the above embodiments and comparative examples are shown in Table 1.

[0102] Table 1 Comparison of mosquito repellent fabric product indicators

[0103] It can be seen from Table 1 that when the amount of mosquito repellent core material is low, the mosquito repellent effect will be enhanced as the amount of mosquito repellent core material increases; however, it can be seen from Examples 3 and 4 that when the amount of mosquito repellent core material reaches a certain value, the mosquito repellent effect will not change as the amount of mosquito repellent core material increases; it can be seen from Example 1, Example 5 and Example 6 that the composite mosquito repellent core material has a better mosquito repellent effect than a single-component mosquito repellent core material; it can be seen from Examples 10-11 that the rotation speed in step S2 will also affect the mosquito repellent effect of the present invention. The mosquito repellent microcapsules prepared at a rotation speed of 3000 rpm have a large particle size, are easy to crust and stratify, and are not resistant to storage, and have a slightly poor effect. The mosquito repellent microcapsules prepared at a rotation speed of 7000 rpm are easy to cause microcapsule demulsification due to excessive shear force, resulting in a low coverage rate and poor effect, but the mosquito repellent time is still better than the comparative example.

[0104] In summary, the outdoor mosquito repellent fabric prepared by the present invention has good mosquito repellent effect, lasting mosquito repellent time, and is safe and environmentally friendly, and can meet the mosquito repellent requirements of the existing outdoor market.

[0105] It should be understood that the above embodiments are only used to illustrate the present invention and are not used to limit the scope of protection of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. A method for preparing a mosquito repellent fabric, characterized in that: The following steps are involved: S1, dissolving an emulsifier in deionized water to obtain a uniform water phase; dissolving a shell material and a mosquito repellent core material in an organic solvent to obtain a uniform oil phase; S2, adding the oil phase obtained in step S1 to the water phase obtained in step S1, emulsifying under high-speed shearing to obtain a stable O / W emulsion; S3, continuously stirring the O / W emulsion obtained in step S2 at a constant temperature to obtain a mosquito repellent microcapsule emulsion; S4, dispersing the mosquito repellent microcapsule emulsion, binder and penetrant prepared in step S3 in deionized water to prepare a finishing liquid; S5. The mosquito repellent microcapsule emulsion is impregnated onto the fabric by an impregnation method, and the mosquito repellent fabric is obtained after drying.

2. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: In step S1, the emulsifier includes sodium salt of styrene-maleic anhydride copolymer, sodium dodecylbenzene sulfonate, ethylene-maleic anhydride copolymer, acyl glycinate, gum arabic powder or Tween-80; the shell material includes poly-ε-caprolactone, polylactic acid, polylactide-co-glycolic acid or polyglycolic acid; the mosquito repellent core material includes at least one of pyrethroid, eucalyptus and plant essential oil.

3. The method for preparing the mosquito repellent fabric according to claim 2, characterized in that: The pyrethroids include deltamethrin, cyfluthrin, tricyhalothrin, cis-cypermethrin, permethrin or ethoxyfen; the plant essential oils include citronella essential oil, thyme essential oil, peppermint essential oil, rue essential oil or schizonepeta essential oil; the mass ratio of the pyrethroids, eucalyptus and plant essential oils is 0-1:0-1:0-1.

4. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: The mass ratio of the shell material, the mosquito repellent core material and the solvent in the oil phase is 1:1-3:4-7; the mass fraction of the emulsifier in the water phase is 3%-5%.

5. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: In step S2, the mass ratio of the water phase to the oil phase is 3-5:1; the emulsification conditions are: using a high shear dispersing emulsifier at 40-60°C and a rotation speed of 3000-7000 rpm for emulsification for 5-20 min.

6. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: In step S3, the constant temperature is 30-40°C; the stirring speed is 300-500 r / min, and the stirring time is 6-10 h.

7. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: In step S4, the mass ratio of the mosquito repellent microcapsule emulsion, the binder, the penetrant and the deionized water is 0.5-5:8-12:8-12:70-90.

8. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: In step S4, the adhesive includes an acrylic adhesive, a styrene-type ion exchange resin adhesive, an epoxy resin adhesive, a poly(diallyl phthalate) adhesive or a polyurethane adhesive; The penetrant includes penetrant JFC, penetrant OEP-70, penetrant JFC-1 or penetrant JFC-2.

9. The method for preparing the mosquito repellent fabric according to claim 1, characterized in that: In step S5, the fabric is immersed in the finishing liquid for 3 to 10 minutes; the liquid carrying rate of padding is 100%; the drying temperature is 120-140°C, and the drying time is 60 to 120 seconds.

10. A mosquito repellent fabric, characterized in that: The mosquito repellent fabric is prepared by the method for preparing the mosquito repellent fabric according to any one of claims 1 to 9.

Images