Environment-friendly mosquito-repelling slippers and production process thereof

Abstract

The present application relates to the technical field of shoes, and provides an environment-friendly mosquito-repelling slipper and a production process thereof, which comprises the following steps: preparing the mosquito-repelling slipper by in-mold foaming of a composition, wherein the composition comprises the following components in parts by weight: 40-50 parts of type 3 polyvinyl chloride resin, 20-25 parts of tributyl citrate, 5-15 parts of dioctyl terephthalate, 1-3 parts of calcium carbonate, 1-1.5 parts of industrial soda foaming agent, 0.5-1 part of expanded microspheres, 0.3-0.5 part of internal lubricant, 0.3-0.5 part of external lubricant, 15-20 parts of mosquito-repelling traditional Chinese medicine powder and 2-3 parts of flame retardant. The present application solves the problems of the existing mosquito-repelling slippers, such as the non-ideal mosquito-repelling effect and the short mosquito-repelling duration.

Description

Technical Field

[0001] This invention relates to the field of footwear technology, specifically to an environmentally friendly mosquito-repellent slipper and its manufacturing process. Background Technology

[0002] Slippers are a type of footwear with an open heel and a toe box. They are usually flat and made of lightweight materials such as leather, plastic, or fabric. Slippers vary depending on the occasion and intended use; for example, beach slippers are made of plastic instead of fabric for waterproofing and easy cleaning. However, existing summer slippers have certain drawbacks. In summer, mosquitoes are abundant, and their bites can spread diseases and affect health. Furthermore, when wearing slippers, the feet are frequently exposed, leading to sweating and odor, which attracts more insects.

[0003] Therefore, mosquito-repellent slippers have emerged. For example, Chinese patent document CN201820737171.6 discloses a massage mosquito-repellent slipper, including a slipper sole, a ventilation hole fixedly installed on one outer surface of the sole, a sole surface fixedly installed on the upper outer surface of the sole, an upper fixedly installed on the upper outer side of the sole, a fluorescent marker strip fixedly installed on the upper outer surface of the upper, and a support body fixedly installed inside the sole. This utility model's massage mosquito-repellent slipper includes a large, medium, and small mosquito-repellent oil pouch and a fluorescent marker strip. During walking and stepping, camphor fragrance is released through micropores to repel mosquitoes. Simultaneously, the oil pouch itself acts as an air cushion, providing a good massage function. When wearing the slipper in the dark, the fluorescent marker strip on the upper allows for instant identification, making it more convenient to wear and suitable for different work situations, thus offering better application prospects. For example, CN201420029492.2 discloses a mosquito-repellent slipper. It includes an upper and a sole, with a composite layer and a mosquito-repellent fabric arranged sequentially from top to bottom on the sole. This invention has a simple structure and can prevent mosquito bites on the feet. Placing the mosquito-repellent fabric in the middle avoids high-temperature treatment, ensuring the stability of the mosquito-repellent material. This prevents the mosquito-repellent fabric from directly contacting the skin, making it suitable for people with sensitive skin, and it is also moisture-wicking and breathable. The addition of a second sponge layer, an EVA layer, and a heel counter makes the slipper more comfortable to wear and fits the shape of the foot better. Grooves increase the friction between the sole and the ground, preventing slippers from slipping while walking.

[0004] However, the aforementioned patents disclose several technologies. The former involves setting up large, medium, and small mosquito-repellent oil packets, which release camphor fragrance through micropores during walking and pressing to repel mosquitoes. This method cannot achieve all-around mosquito repellency, and the effect is almost nonexistent when people sit down to rest. Furthermore, its overall duration of use is short. The latter method involves sandwiching a layer of mosquito-repellent fabric in the middle of the sole. Slippers made with this method only have a mosquito-repellent effect along the edge of the sole, failing to effectively repel mosquitoes on the upper and instep, and the mosquito-repellent effect is also short-lived. Summary of the Invention

[0005] In response to the problems of poor mosquito repellency and short duration of existing slippers, this invention provides an environmentally friendly mosquito repellent slipper and its manufacturing process. The mosquito repellent slippers produced by this invention have both long-lasting and all-around mosquito repellency, as well as good flame retardant properties, lightweight, and comfortable wear.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly mosquito-repellent slipper, comprising a mosquito-repellent slipper made by in-mold foaming of a composition, wherein the composition comprises the following components in parts by weight: 40-50 parts of type 3 polyvinyl chloride resin, 20-25 parts of tributyl citrate, 5-15 parts of dioctyl terephthalate, 1-3 parts of calcium carbonate, 1-1.5 parts of industrial soda foaming agent, 0.5-1 part of expanded microspheres, 0.3-0.5 parts of internal lubricant, 0.3-0.5 parts of external lubricant, 15-20 parts of mosquito-repellent traditional Chinese medicine powder, and 2-3 parts of flame retardant.

[0007] Furthermore, the mosquito-repellent herbal powder includes a compound of one or more of the following traditional Chinese medicines: mugwort powder, lemongrass powder, peppermint powder, and camphor wood powder.

[0008] Furthermore, the mosquito-repellent herbal powder is ground and passed through a 200-mesh sieve after being compounded.

[0009] Furthermore, the mosquito-repellent herbal powder is a microencapsulated mosquito-repellent herbal powder.

[0010] Furthermore, the method for preparing microencapsulated mosquito-repellent traditional Chinese medicine powder includes the following steps:

[0011] S1. Core material preparation: The volatile oil extract of mosquito-repellent Chinese medicine is used as the core material, or the ultrafine powder of mosquito-repellent Chinese medicine is mixed with an emulsifier as the core material.

[0012] S2. Wall material dissolution: In the reaction vessel, gelatin and gum arabic are dissolved in deionized water to prepare a wall material solution. The ratio of gelatin to gum arabic is 1:1, and the total concentration of the wall material solution is 3%-5%. The solution is heated to 50°C.

[0013] S3. Emulsification and homogenization: The core material obtained in step S1 is slowly added to the wall material solution obtained in step S2 in a high-speed homogenizer, and emulsification is carried out in a high-speed homogenizer at a speed of 10,000 rpm for 5-8 minutes to form a uniform O / W type emulsion.

[0014] S4. Re-coagulation and curing reaction: Under stirring, the pH of the O / W type emulsion prepared by S3 is adjusted to 4.0-4.5 with dilute acetic acid. Due to the change of charge, gelatin and gum arabic undergo re-coagulation and form a coating around the core material. The reaction system is cooled to below 10°C and glutaraldehyde is added for curing to obtain a suspension emulsion.

[0015] S5. Spray drying: The suspension emulsion obtained in step S4 is sent to a spray drying tower for drying. The inlet air temperature is 180±5℃ and the outlet air temperature is 80±5℃. After drying, microencapsulated mosquito repellent powder is obtained.

[0016] Furthermore, the flame retardant is aluminum hydroxide or magnesium hydroxide.

[0017] The manufacturing process of the above-mentioned environmentally friendly mosquito-repellent slippers includes the following steps:

[0018] Step 1, Ingredients and Pretreatment: Weigh all raw materials according to the example, and bake the mosquito repellent Chinese medicine powder and type 3 polyvinyl chloride resin at 80°C for 2 hours to remove moisture;

[0019] Step 2: High-speed hot mixing. Add type 3 polyvinyl chloride resin to a high-speed mixer and raise the temperature to 80°C. Add tributyl citrate and dioctyl terephthalate and stir until absorbed. Then add calcium carbonate, internal lubricant, flame retardant, and half of the external lubricant in sequence and stir to mix. Next, add mosquito repellent Chinese herbal powder, industrial soda foaming agent, and expanding microspheres. Finally, add the remaining external lubricant and mix at high speed until the temperature reaches 105-110°C. Discharge the material.

[0020] Step 3, low-speed cold mixing: Immediately transfer the hot mixture discharged from Step 2 into a low-speed cold mixer and stir and cool it to below 40°C;

[0021] Step 4, Compression foaming: Accurately weigh the cooled dry mixture from Step 3 and pour it into the slipper mold cavity. Push the mold into a preheated flat vulcanizing machine at 165±5℃, close the mold, apply a pressure of 12-15 MPa, and hold the pressure for 90 seconds. At this time, the material is plasticized, the foaming agent decomposes, but the gas is suppressed. When depressurizing and foaming, the pressure needs to be quickly reduced to 2-3 MPa within 2-3 seconds. The mold opens slightly, and the material expands and foams rapidly, filling the cavity. Hold the pressure for 10-15 seconds to solidify, and then cool and solidify. Cool the mold to 50-60℃ with cooling water. After cooling and solidification, open the mold to obtain the initial finished product.

[0022] Step five: Trim, inspect, and package the initial product from step four to complete the production of mosquito-repellent slippers.

[0023] Furthermore, before removing moisture from the mosquito-repellent herbal powder in step one, the herbal powder is first microencapsulated. The method for microencapsulating the mosquito-repellent herbal powder includes the following steps:

[0024] S1. Core material preparation: The volatile oil extract of mosquito-repellent Chinese medicine is used as the core material, or the ultrafine powder of mosquito-repellent Chinese medicine is mixed with an emulsifier as the core material.

[0025] S2. Wall material dissolution: In the reaction vessel, gelatin and gum arabic are dissolved in deionized water to prepare a wall material solution. The ratio of gelatin to gum arabic is 1:1, and the total concentration of the wall material solution is 3%-5%. The solution is heated to 50°C.

[0026] S3. Emulsification and homogenization: The core material obtained in step S1 is slowly added to the wall material solution obtained in step S2 in a high-speed homogenizer, and emulsification is carried out in a high-speed homogenizer at a speed of 10,000 rpm for 5-8 minutes to form a uniform O / W type emulsion.

[0027] S4. Re-coagulation and curing reaction: Under stirring, the pH of the O / W type emulsion prepared by S3 is adjusted to 4.0-4.5 with dilute acetic acid. Due to the change of charge, gelatin and gum arabic undergo re-coagulation and form a coating around the core material. The reaction system is cooled to below 10°C and glutaraldehyde is added for curing to obtain a suspension emulsion.

[0028] S5. Spray drying: The suspension emulsion obtained in step S4 is sent to a spray drying tower for drying. The inlet air temperature is 180±5℃ and the outlet air temperature is 80±5℃. After drying, microencapsulated mosquito repellent powder is obtained.

[0029] Furthermore, mosquito-repellent herbal powder is a compound of traditional Chinese medicine made by combining any two or more of the following: mugwort powder, lemongrass powder, peppermint powder, and camphor wood powder.

[0030] By adopting the aforementioned technical solution, the beneficial effects of this invention are as follows: This invention uses type 3 polyvinyl chloride resin as the product skeleton, combined with a composite environmentally friendly plasticizing system of tributyl citrate and dioctyl terephthalate to jointly reduce the melt viscosity of type 3 polyvinyl chloride resin and provide basic flexibility; dioctyl terephthalate is resistant to migration and low temperatures, ensuring product durability, and the synergistic effect of tributyl citrate and dioctyl terephthalate ensures the product's softness and comfort throughout its entire life cycle; industrial soda foaming agent and expanded microspheres are used as the composite foaming system, with the industrial soda foaming agent having a low decomposition temperature (~100-120℃) providing initial foaming power and gas source; while expanded microspheres... Microspheres are physical foaming agents that expand when heated (starting at 80-90℃), forming a regular and uniform closed-cell structure, thus giving the product excellent resilience and cushioning. The industrial soda foaming agent and the expanded microspheres complement each other in terms of foaming temperature and mechanism, forming a synergistic effect of "low-temperature foaming and high-temperature pore expansion," resulting in finer and more uniform pores and a better product feel. They can evenly distribute the mosquito-repellent herbal powder throughout the foam structure of the mosquito-repellent slippers, providing excellent mosquito-repellent function for the entire pair of slippers, achieving both long-lasting and all-round mosquito repellency. Flame retardants enhance home fire safety and have good compatibility with the system, without affecting foaming. Calcium carbonate is an inexpensive filler, and a small amount is added to adjust cost and rigidity. Internal lubricants (such as stearic acid) reduce intermolecular friction and promote plasticization; external lubricants (such as polyethylene wax) reduce friction between materials and equipment, preventing sticking. The lubrication system composed of calcium carbonate, internal lubricant, and external lubricant, combined with the composite foaming system, allows the mosquito-repellent herbal powder to be mixed uniformly with type 3 polyvinyl chloride resin and foamed at high temperatures with high filler content. This makes the mosquito-repellent slippers of this invention both long-lasting and all-around mosquito repellency, and also have good flame retardant properties, are lightweight, and comfortable to wear. The flame retardant used is environmentally friendly aluminum hydroxide or magnesium hydroxide, which decomposes and absorbs heat when heated, releasing water vapor, which is flame-retardant and smoke-suppressing, making its flame-retardant effect even better. Microencapsulation of mosquito-repellent herbal powder creates microencapsulated mosquito-repellent powder. This solves the problems of easy decomposition, volatility, and low retention of effective ingredients during high-temperature processing with type 3 polyvinyl chloride resin. The microencapsulated powder effectively retains its mosquito-repellent components during foaming within the type 3 polyvinyl chloride resin mold, significantly enhancing the long-lasting mosquito-repellent performance of the resulting mosquito-repellent slippers. The mosquito-repellent herbal powder is a compound of artemisia powder, citronella powder, peppermint powder, and camphor wood powder, resulting in a better mosquito-repellent effect and a pleasant fragrance. Detailed Implementation

[0031] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The raw materials and their manufacturers used in the examples are shown in the table below:

[0033]

[0034] Test parameters and metrics:

[0035] Mosquito repellency effect: The test was conducted according to the standard GB / T 13917.9-2009 Indoor efficacy test method for pesticide registration sanitary insecticides, and the repellency rate against mosquitoes was determined in a closed space.

[0036] Flame retardancy: Tested according to the standard GB 20286-2006 Requirements and markings for the combustion performance of flame retardant products and components in public places;

[0037] Hardness: The hardness was tested according to the standard GB / T 531.1-2008 and determined by the Shore hardness tester method.

[0038] Density: Tested according to GB / T 6343 standard;

[0039] Compression set: Tested according to GB / T 6669 standard. Example 1

[0040] Environmentally friendly mosquito-repellent slippers, comprising slippers made by in-mold foaming of a composition, wherein the composition comprises the following components in parts by weight: 45 parts of type 3 polyvinyl chloride resin, 22 parts of tributyl citrate, 10 parts of dioctyl terephthalate, 2 parts of calcium carbonate, 1.2 parts of industrial soda foaming agent (sodium bicarbonate), 0.8 parts of expanded microspheres, 0.4 parts of internal lubricant (stearic acid), 0.4 parts of external lubricant (polyethylene wax), 18 parts of microencapsulated mosquito-repellent traditional Chinese medicine powder, and 2.5 parts of flame retardant (aluminum hydroxide).

[0041] The method for preparing microencapsulated mosquito-repellent traditional Chinese medicine powder includes the following steps:

[0042] S1. Core material preparation: The compound of four Chinese medicines, namely, Artemisia argyi powder, Citronella powder, Mentha powder and Camphor wood powder, is made into mosquito repellent Chinese medicine powder. After compounding, the mosquito repellent Chinese medicine powder is ground and passed through a 200-mesh sieve to obtain the ultrafine powder of mosquito repellent Chinese medicine powder. The ultrafine powder of mosquito repellent Chinese medicine powder is mixed with an emulsifier as the core material.

[0043] S2. Wall Material Dissolution: In a reaction vessel, gelatin and gum arabic are dissolved in deionized water to prepare a wall material solution with a ratio of 1:1 between gelatin and gum arabic and a total concentration of 4%. The solution is then heated to 50°C.

[0044] S3. Emulsification and homogenization: The core material obtained in step S1 is slowly added to the wall material solution obtained in step S2 in a high-speed homogenizer, and emulsification is carried out in a high-speed homogenizer at a speed of 10,000 rpm for 5 minutes to form a uniform O / W type emulsion.

[0045] S4. Re-coagulation and curing reaction: The O / W type emulsion prepared by S3 is stirred and the pH of the emulsion is adjusted to 4.0 with dilute acetic acid. Due to the change of charge, gelatin and gum arabic undergo re-coagulation and form a coating around the core material. The reaction system is then cooled to below 10°C and glutaraldehyde is added for curing to obtain a suspension emulsion.

[0046] S5. Spray drying: The suspension emulsion obtained in step S4 is sent to a spray drying tower for drying. The inlet air temperature is 180℃ and the outlet air temperature is 80℃. After drying, microencapsulated mosquito repellent Chinese medicine powder is obtained.

[0047] The manufacturing process of the above-mentioned environmentally friendly mosquito-repellent slippers includes the following steps:

[0048] Step 1, Ingredients and Pretreatment: Weigh all raw materials according to the example, and bake the microencapsulated mosquito repellent Chinese medicine powder and type 3 polyvinyl chloride resin at 80°C for 2 hours to remove moisture;

[0049] Step 2: High-speed hot mixing. Add type 3 polyvinyl chloride resin to a high-speed mixer and raise the temperature to 80°C. Add tributyl citrate and dioctyl terephthalate and stir until absorbed. Then add calcium carbonate, internal lubricant, flame retardant, and half of the external lubricant in sequence and stir to mix. Next, add mosquito repellent Chinese herbal powder, industrial soda foaming agent, and expanding microspheres. Finally, add the remaining external lubricant and mix at high speed until the temperature reaches 105°C. Discharge the material.

[0050] Step 3, low-speed cold mixing: Immediately transfer the hot mixture discharged from Step 2 into a low-speed cold mixer and stir and cool it to below 40°C;

[0051] Step 4, Compression foaming: Accurately weigh the cooled dry mixture from Step 3 and pour it into the slipper mold cavity. Push the mold into a preheated 165℃ flat vulcanizing machine, close the mold, apply a pressure of 13 MPa, and hold the pressure for 90 seconds. At this time, the material is plasticized, the foaming agent decomposes, but the gas is suppressed. When depressurizing and foaming, the pressure needs to be quickly reduced to 2.5 MPa within 2-3 seconds. The mold opens slightly, the material expands and foams rapidly, filling the cavity. Hold the pressure for 12 seconds to solidify, and then cool and solidify. Cool the mold to 55℃ with cooling water. After cooling and solidification, open the mold to obtain the initial finished product.

[0052] Step five: Trim, inspect, and package the initial product from step four to complete the production of mosquito-repellent slippers.

[0053] Product performance test results:

[0054] Initial mosquito repellency rate (%): 92;

[0055] Mosquito repellency rate (%) after 30-day accelerated aging: 75;

[0056] Flame retardant performance: Self-extinguishing after flameout <10s;

[0057] Hardness (Asker C): 40;

[0058] Apparent density (g / cm³): 0.38;

[0059] Compression set (%): 18;

[0060] Feel and appearance: Soft, with fine pores. Example 2

[0061] Environmentally friendly mosquito-repellent slippers, comprising slippers made by in-mold foaming of a composition, wherein the composition comprises the following components in parts by weight: 50 parts of type 3 polyvinyl chloride resin, 20 parts of tributyl citrate, 15 parts of dioctyl terephthalate, 1 part of calcium carbonate, 1.5 parts of industrial soda foaming agent (sodium bicarbonate), 0.5 parts of expanded microspheres, 0.3 parts of internal lubricant (stearic acid), 0.3 parts of external lubricant (polyethylene wax), 15 parts of microencapsulated mosquito-repellent traditional Chinese medicine powder, and 2.0 parts of flame retardant (aluminum hydroxide).

[0062] The preparation process is the same as in Example 1.

[0063] Product performance test results:

[0064] Initial mosquito repellency rate (%): 88;

[0065] Mosquito repellency rate (%) after 30-day accelerated aging: 70%;

[0066] Flame retardant performance: Self-extinguishing after flameout <15s;

[0067] Hardness (Asker C): 45;

[0068] Apparent density (g / cm³): 0.42;

[0069] Compression set (%): 22;

[0070] Feel and appearance: Moderate, with uniform foam holes. Example 3

[0071] Environmentally friendly mosquito-repellent slippers, comprising slippers made by in-mold foaming of a composition, wherein the composition comprises the following components in parts by weight: 40 parts of type 3 polyvinyl chloride resin, 25 parts of tributyl citrate, 5 parts of dioctyl terephthalate, 3 parts of calcium carbonate, 1 part of industrial soda foaming agent (sodium bicarbonate), 1 part of expanded microspheres, 0.5 parts of internal lubricant (stearic acid), 0.5 parts of external lubricant (polyethylene wax), 20 parts of microencapsulated mosquito-repellent traditional Chinese medicine powder, and 3.0 parts of flame retardant (aluminum hydroxide).

[0072] The preparation process is the same as in Example 1.

[0073] Product performance test results:

[0074] Initial mosquito repellency rate (%): 95;

[0075] Mosquito repellency rate (%) after 30-day accelerated aging: 78;

[0076] Flame retardant performance: Self-extinguishing after flameout <8s;

[0077] Hardness (Asker C): 36;

[0078] Apparent density (g / cm³): 0.35;

[0079] Compression set (%): 15;

[0080] Feel and appearance: Extremely soft with abundant pores.

[0081] Comparative Example 1

[0082] Slippers, including mosquito-repellent slippers made by in-mold foaming of a composition, said composition comprising the following components in parts by weight: 45 parts of type 3 polyvinyl chloride resin, 22 parts of tributyl citrate, 10 parts of dioctyl terephthalate, 2 parts of calcium carbonate, 1.2 parts of industrial soda foaming agent (sodium bicarbonate), 0.8 parts of expanded microspheres, 0.4 parts of internal lubricant (stearic acid), 0.4 parts of external lubricant (polyethylene wax), 18 parts of ordinary mosquito-repellent herbal powder (untreated), and 2.5 parts of flame retardant (aluminum hydroxide).

[0083] The preparation process is the same as in Example 1.

[0084] Product performance test results:

[0085] Initial mosquito repellency rate (%): 90;

[0086] Mosquito repellency rate (%) after 30-day accelerated aging: 30;

[0087] Flame retardant performance: Self-extinguishing after flameout <10s;

[0088] Hardness (Asker C): 48;

[0089] Apparent density (g / cm³): 0.41;

[0090] Compression set (%): 25;

[0091] Feel and appearance: Slightly hard, uneven foam cells.

[0092] Comparative Example 2

[0093] Slippers, including mosquito-repellent slippers made by in-mold foaming of a composition, said composition comprising the following components in parts by weight: 45 parts of type 3 polyvinyl chloride resin, 22 parts of tributyl citrate, 10 parts of dioctyl terephthalate, 2 parts of calcium carbonate, 1.2 parts of industrial soda foaming agent (sodium bicarbonate), 0.4 parts of internal lubricant (stearic acid), and 0.4 parts of external lubricant (polyethylene wax).

[0094] The preparation process is the same as in Example 1.

[0095] Product performance test results:

[0096] Initial mosquito repellency rate (%): 0;

[0097] Mosquito repellency rate (%) after 30-day accelerated aging: 0;

[0098] Flame retardant properties: sustained combustion;

[0099] Hardness (Asker C): 55;

[0100] Apparent density (g / cm³): 0.45;

[0101] Compression set (%): 35;

[0102] Feel and appearance: Hard, with no elasticity.

[0103] Comparative Example 3

[0104] Slippers, including mosquito-repellent slippers made by in-mold foaming of a composition, said composition comprising the following components in parts by weight: 45 parts of type 3 polyvinyl chloride resin, 22 parts of tributyl citrate, 10 parts of dioctyl terephthalate, 2 parts of calcium carbonate, 1.2 parts of industrial soda foaming agent (sodium bicarbonate), 0.8 parts of expanded microspheres, 0.4 parts of internal lubricant (stearic acid), and 0.4 parts of external lubricant (polyethylene wax).

[0105] Product performance test results:

[0106] Initial mosquito repellency rate (%): 0;

[0107] Mosquito repellency rate (%) after 30-day accelerated aging: 0;

[0108] Flame retardant performance: No requirement;

[0109] Hardness (Asker C): 60;

[0110] Apparent density (g / cm³): 0.51;

[0111] Compression set (%): 40;

[0112] Feel and appearance: Hard, insufficient foaming.

[0113] Based on the results of the above three embodiments and three comparative examples:

[0114] Examples 1-3 all exhibit excellent overall performance—low density, high softness, high resilience, long-lasting mosquito repellency, and effective flame retardancy.

[0115] Comparative Example 1: Using non-microencapsulated mosquito-repellent Chinese herbal powder, the initial effect was acceptable, but after a period of time, its mosquito-repellent durability decreased sharply.

[0116] Comparative Example 2: The mosquito repellent and flame retardant functions were completely removed, and the product reverted to ordinary slippers. The functions were missing, and the incomplete foaming system resulted in high density and a hard feel.

[0117] Comparative Example 3: Only the basic formula is retained, without any special functions, and the physical properties are ordinary, highlighting the dual advantages of the present invention in terms of functionality and comfort.

[0118] The weight ratio of each raw material in the composition of this invention is preferably as follows: 40-50 parts of type 3 polyvinyl chloride resin, 20-25 parts of tributyl citrate, 5-15 parts of dioctyl terephthalate, 1-3 parts of calcium carbonate, 1-1.5 parts of industrial soda foaming agent, 0.5-1 part of expanded microspheres, 0.3-0.5 parts of internal lubricant, 0.3-0.5 parts of external lubricant, 15-20 parts of mosquito repellent traditional Chinese medicine powder, and 2-3 parts of flame retardant.

[0119] In the method for preparing microencapsulated mosquito-repellent traditional Chinese medicine powder, the core material preparation can also use the volatile oil extract of the mosquito-repellent traditional Chinese medicine as the core material; wall material dissolution: gelatin and gum arabic are dissolved in deionized water to prepare a wall material solution with a ratio of 1:1, and the total concentration of the wall material solution is preferably 3%-5%; S3, emulsification and homogenization: the time is preferably 5-8 minutes; coagulation and solidification reaction: the pH of the O / W type emulsion prepared by S3 is adjusted to 4.0-4.5 with dilute acetic acid under stirring; when the suspension emulsion is sent into the spray drying tower for drying, the inlet air temperature is preferably 180±5℃ and the outlet air temperature is preferably 80±5℃. When preparing mosquito-repellent slippers, it is best to mix at high speed until the temperature reaches 105-110℃. For compression molding, it is advisable to push the mold into a flat vulcanizing machine preheated to 165±5℃, close the mold, and apply a pressure of 12-15 MPa. During depressurization and foaming, it is best to quickly reduce the pressure to 2-3 MPa within 2-3 seconds. The mold should be slightly open, and the material should expand and foam rapidly to fill the cavity. Hold the pressure for 10-15 seconds to set the shape, and then cool and set the shape. It is advisable to cool the mold to 50-60℃ by circulating cooling water.

[0120] The external lubricant can be any material other than polyethylene wax, and can be used in conjunction with the internal lubricant, or any material other than stearic acid, to achieve the same function, improving processing flow and facilitating demolding. The mosquito-repellent herbal powder can be a compound containing one or more of the following herbs: mugwort powder, lemongrass powder, peppermint powder, and camphor wood powder. The mosquito-repellent herbal powder can also be a compound containing other ingredients to achieve a mosquito-repellent effect. In the above embodiment, the inclusion of mugwort powder, lemongrass powder, peppermint powder, and camphor wood powder is to enhance the mosquito-repellent effect and give the slippers a pleasant fragrance.

[0121] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An eco-friendly mosquito repellent slipper, characterized in that: The application relates to a mosquito-repelling slippers made of a composition by in-mold foaming, the composition comprising the following components in parts by weight: 40-50 parts of polyvinyl chloride resin type 3, 20-25 parts of tributyl citrate, 5-15 parts of dioctyl terephthalate, 1-3 parts of calcium carbonate, 1.5-2.5 parts of a composite foaming agent, 0.3-0.5 parts of an internal lubricant, 0.3-0.5 parts of an external lubricant, 15-20 parts of microencapsulated mosquito-repelling Chinese medicine powder and 2-3 parts of a flame retardant, wherein the composite foaming agent is composed of 1-1.5 parts of industrial soda foaming agent and 0.5-1 part of expanded microspheres, and the capsule wall material of the microencapsulated mosquito-repelling Chinese medicine powder is a gelatin-arabic gum compound.

2. The eco-friendly mosquito repellent slipper according to claim 1, wherein: The core material of the microencapsulated mosquito-repelling Chinese medicine powder is volatile oil extract or superfine powder selected from one or more of the following: Artemisia argyi, citronella, mint and camphor wood.

3. The eco-friendly mosquito repellent slipper according to claim 1, wherein: The method for preparing the microencapsulated mosquito-repelling Chinese medicine powder comprises the following steps: S1, core material preparation: taking volatile oil extract of mosquito-repelling Chinese medicine as the core material, or mixing superfine powder of mosquito-repelling Chinese medicine with an emulsifier as the core material; S2, wall material dissolution: dissolving gelatin and arabic gum in deionized water in a reaction kettle to prepare a wall material solution, the ratio of gelatin to arabic gum is 1:1, the total concentration of the wall material solution is 3%-5%, and the wall material solution is heated to 50 DEG C; S3, emulsification homogenization: slowly adding the core material prepared in step S1 into the wall material solution prepared in step S2 in a high-speed homogenizer, and emulsifying the core material by using the high-speed homogenizer at a rotating speed of 10000 rpm for 5-8 minutes to form a uniform O / W emulsion; S4, complex coacervation and solidification reaction: adjusting the pH of the O / W emulsion prepared in step S3 to 4.0-4.5 by using dilute acetic acid under stirring, and performing complex coacervation of gelatin and arabic gum due to charge change to form a package around the core material, and then adding glutaraldehyde to perform solidification after the reaction system is cooled to below 10 DEG C to obtain a suspension emulsion; S5, spray drying: feeding the suspension emulsion prepared in step S4 into a spray drying tower for drying, the inlet air temperature is 180+ / -5 DEG C, and the outlet air temperature is 80+ / -5 DEG C, and the microencapsulated mosquito-repelling Chinese medicine powder is obtained after drying.

4. The eco-friendly mosquito repellent slipper according to claim 1, wherein: The flame retardant is aluminum hydroxide or magnesium hydroxide.

5. The process for preparing the eco-friendly mosquito repellent slippers according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step one, batching and pretreatment: weighing all raw materials according to the weight parts in claim 1, and baking the microencapsulated mosquito-repelling Chinese medicine powder and the polyvinyl chloride resin type 3 at 80 DEG C for 2 hours to remove water; Step two, high-speed hot mixing: adding the polyvinyl chloride resin type 3 into a high-speed mixer, increasing the temperature to 80 DEG C, adding the tributyl citrate and the dioctyl terephthalate, stirring until absorption, then adding the calcium carbonate, the internal lubricant, the flame retardant and half of the external lubricant in sequence, stirring and mixing, then adding the microencapsulated mosquito-repelling Chinese medicine powder, the industrial soda foaming agent and the expanded microspheres, and finally adding the remaining external lubricant, and high-speed mixing until the temperature reaches 105-110 DEG C, and then discharging; Step three, low-speed cold mixing: immediately transferring the hot mixed material discharged in step two into a low-speed cold mixer, and stirring and cooling to below 40 DEG C. Step four, the mold foaming forming, the dry mixture after cooling in step three is accurately weighed and poured into the cavity of the slipper mold, the mold is pushed into the flat vulcanizing machine which has been preheated to 165±5℃, the mold is closed, the pressure of 12-15 MPa is applied, and the pressure is kept for 90 seconds, at this time the material is plasticized, the foaming agent is decomposed but the gas is suppressed, and the pressure needs to be quickly reduced to 2-3 MPa within 2-3 seconds when the pressure is released and foamed, the mold is slightly opened, the material is rapidly expanded and foamed, the cavity is filled, and the pressure is kept for 10-15 seconds to shape, and then the cooling is performed to shape, the mold is cooled to 50-60℃ by cooling water, the mold is opened after the cooling and shaping are completed, and the preliminary product is obtained; Step five, the preliminary product in step four is trimmed, inspected and packaged to complete the mosquito-repelling slipper manufacturing.

6. The process for preparing the eco-friendly mosquito repellent slipper according to claim 5, characterized in that: The microencapsulated mosquito-repelling traditional Chinese medicine powder is prepared by complex coacervation method, including the following steps: S1, core material preparation: the volatile oil extract of mosquito-repelling traditional Chinese medicine is used as the core material, or the superfine powder of mosquito-repelling traditional Chinese medicine is mixed with an emulsifier as the core material; S2, wall material dissolution: in a reaction kettle, gelatin and gum arabic are dissolved in deionized water to prepare a wall material solution, the ratio of gelatin to gum arabic is 1:1, and the total concentration of the wall material solution is 3%-5%, and the solution is heated to 50℃; S3, emulsification and homogenization: the core material prepared in step S1 is slowly added to the wall material solution prepared in step S2 in a high-speed homogenizer, and emulsification is performed by using the high-speed homogenizer at a speed of 10000 rpm for 5-8 minutes to form a uniform O / W emulsion; S4, complex coacervation and curing reaction: the O / W emulsion prepared in S3 is adjusted to a pH of 4.0-4.5 by using dilute acetic acid under stirring, the gelatin and gum arabic are complex coacervated due to the change of electric charge to form a package around the core material, the reaction system is cooled to below 10℃, and glutaraldehyde is added for curing to obtain a suspension emulsion; S5, spray drying: the suspension emulsion prepared in step S4 is sent into a spray drying tower for drying, the inlet air temperature is 180±5℃, and the outlet air temperature is 80±5℃, and the microencapsulated mosquito-repelling traditional Chinese medicine powder is obtained after drying.

7. The process for preparing the eco-friendly mosquito repellent slipper according to claim 6, characterized in that: The superfine powder of mosquito-repelling traditional Chinese medicine is a traditional Chinese medicine compound prepared by compounding any two or more than two traditional Chinese medicines from folium artemisiae argyi powder, citronella powder, mint powder and camphor wood powder.

Images