A thin-film electric mosquito-repellent incense and its preparation method

Abstract

The present invention relates to a thin-film electric mosquito-repellent incense and a preparation method thereof, belonging to the technical field of daily chemicals. The thin-film electric mosquito-repellent incense comprises a thin-film mosquito-repellent incense base material and an electric heater. The electric heater includes a film-releasing reel, a heating element, and a film-winding reel. The heating element is arranged between the film-releasing reel and the film-winding reel. One end of the thin-film mosquito-repellent incense base material is wound around the film-releasing reel, and the other end is wound around the film-winding reel. The film-winding reel drives the thin-film mosquito-repellent incense base material to move against the heating element. The thin-film mosquito-repellent incense base material comprises a thin-film base material and a coating. The coating includes an insecticide and is attached to the thin-film base material. The fitting surface between the thin-film mosquito-repellent incense base material and the heating element is the thin-film base material. The thin-film electric mosquito-repellent incense is composed of a thin-film mosquito-repellent incense base material and an electric heater, without the need for a large amount of solvent oil. During use, there is no need to change the sheet every day. It is heated by a specially designed electric heater, enabling the insecticidal components to stably volatilize into the room. There is no open flame, no soot is generated, and the drug residue amount after use is low, making it safer and more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of daily chemical technology, and particularly to a thin-film electric mosquito-repellent incense and a preparation method thereof. Background Art

[0002] At present, there are three common mosquito-repellent products on the market. The first is the black mosquito-repellent incense used by burning. It uses carbon powder as the base material and sprays pyrethroid insecticidal components. It is inexpensive, does not consume electricity, and has a good insecticidal effect. However, it will produce soot during use, and there are also certain safety hazards with open flames. The second is the electric mosquito-repellent incense tablet, which generally uses paper or bamboo slices as the base material and drops polyester insecticidal components. When in use, the mosquito-repellent incense tablet is heated by electric heating, and then the insecticidal components are volatilized. There is no open flame and no soot produced during its use, and the price is moderate. However, it needs to be replaced daily, consumes electricity, and has a high drug residue in the mosquito-repellent incense tablet. The third is the electric mosquito-repellent liquid. This product generally uses hydrocarbon petroleum solvents or other solvent oils to dissolve the insecticidal components in it, and then transmits the liquid medicine in the bottle through the capillary action of the core rod and volatilizes it by electric heating. It does not need to be replaced daily during use, has no open flame, and does not produce soot. However, it consumes electricity, the volatilization amount of the solvent oil is relatively large, it is easy to leak liquid during use, and there are safety hazards if it accidentally comes into contact with an open flame. Summary of the Invention

[0003] In view of the above problems, the present invention provides a thin-film electric mosquito-repellent incense, which is composed of a thin-film mosquito-repellent incense base material and an electric heater. It does not require a large amount of solvent oil, does not need to be replaced daily during use, and is heated by a specially designed electric heater, so that the insecticidal components can be stably volatilized into the room. There is no open flame, no soot is produced, and the drug residue is low after use, which is safer and more environmentally friendly.

[0004] To achieve the above object, the present invention provides a thin-film electric mosquito-repellent incense, including a thin-film mosquito-repellent incense base material and an electric heater. The electric heater includes a feed reel, a heating body, and a take-up reel. The heating body is arranged between the feed reel and the take-up reel;

[0005] One end of the thin-film mosquito-repellent incense base material is wound around the feed reel, and the other end is wound around the take-up reel. The take-up reel drives the thin-film mosquito-repellent incense base material to move against the heating body;

[0006] The thin-film mosquito-repellent incense base material includes a thin-film base material and a coating. The coating includes an insecticide. The coating adheres to the thin-film base material. The fitting surface of the thin-film mosquito-repellent incense base material and the heating body is the thin-film base material.

[0007] In one embodiment, the feed reel and the take-up reel rotate in the same direction, and the linear velocity of the take-up reel is 0.5 - 5 cm / h.

[0008] In one embodiment, the temperature of the heating element is 90 - 110°C, the width of the heating element is the same as the width of the thin-film mosquito-repellent incense base material, and the width of the thin-film mosquito-repellent incense base material is 0.5 - 1 cm.

[0009] In one embodiment, the heating element is a PTC heating element, a carbon fiber heating element, an infrared heater, or a heating resistor.

[0010] In one embodiment, the thin-film base material comprises at least one of the following raw materials: polyethylene terephthalate, high-temperature resistant polypropylene, or polysulfone; the high-temperature resistant polypropylene is polypropylene with a maximum temperature resistance of 110 - 142°C, and the weight ratio of the thin-film base material to the insecticide is (1 - 4):1;

[0011] The coating comprises raw materials in the following weight ratio:

[0012]

[0013] Among the raw materials of the above thin-film base material, polyethylene terephthalate (PET) has a maximum temperature resistance of 110 - 150°C, high-temperature resistant polypropylene (high-temperature resistant PP) has a maximum temperature resistance of 110 - 142°C, and polysulfone (PSU) has a maximum temperature resistance of 100 - 150°C. They are all high-molecular thin-film materials that can withstand high temperatures and can be heated for a long time. The thin-film mosquito-repellent incense base material prepared from the above raw materials can withstand high temperatures and release the insecticide in the coating through heating.

[0014] The above thin-film base material may or may not be provided with micropores. When no micropores are provided, the coating adheres to the surface of the thin-film base material through a film-forming agent. When micropores are provided, the coating forms a stronger bonding force with the thin-film base material through the film-forming agent and the micropores.

[0015] In one embodiment, the molecular weight of the polyethylene terephthalate is 5000 - 18000 and 20000 - 30000, such as DuPont FR530 or DuPont 415HP in the United States; the high-temperature resistant polypropylene is high-temperature resistant thin-film grade polypropylene, such as LyondellBasell HP548R; the polysulfone is thin-film grade polysulfone, such as Solvay P-3500 in the United States.

[0016] In one embodiment, the thin-film base material is provided with micropores, the pore diameter of the micropores is 0.1 - 10 μm, the micropores are through-holes, and the porosity is 15% to 40%; the thickness of the thin-film base material is 0.05 - 50 μm.

[0017] Using the micropores with the above aperture can enable the coating to better adhere to the thin film substrate, and the coating liquid is not easily lost during the preparation process. If the prepared thin film mosquito-repellent incense substrate is used by heating, the above micropores can more facilitate the volatilization of the insecticidal components and are not likely to form residues; using the above thickness can make the thin film mosquito-repellent incense substrate light and not occupy too much volume; the thin film mosquito-repellent incense substrate prepared with the above raw materials can withstand high temperatures, has strong solvent resistance, and has good processing performance, and the residue of the insecticidal components during use is relatively low.

[0018] In one embodiment, the thickness of the thin film substrate is 25 - 50 μm; the thin film substrate is polysulfone.

[0019] In one embodiment, the film-forming agent includes at least one of the following raw materials: glyceryl stearate, polyethylene glycol, sodium carboxymethyl cellulose, sodium hydroxymethyl cellulose, or hydroxypropyl methylcellulose; the oil-phase solvent includes at least one of the following raw materials: alkane solvents with C8 - C20, or ester solvents.

[0020] The above raw materials have the ability to mix oil and water. When selected as the film-forming agent, it has the following advantageous effects: 1. It can improve the adhesion on the thin film through micropores and certain lipophilicity; 2. It can gradually adsorb some oily components in the film-forming agent into the thin film; 3. The film-forming agent has a high molecular weight and poor volatility, and has a moderate molecular binding ability with the insecticidal components, does not volatilize with the insecticidal components, and at the same time maintains the characteristic of low residue, which plays a crucial role in the effective volatilization of the insecticidal components. If a thermoplastic polymer coating is selected, the residue amount of the insecticidal components will be relatively high, resulting in some insecticidal components being unable to volatilize effectively, reducing the effect of repelling and killing insects, and causing problems such as drug waste.

[0021] In one embodiment, the insecticide includes at least one of the following raw materials: transfluthrin, chlorofludion, allethrin, prallethrin, tetramethrin, heptafluthrin, or metofluthrin;

[0022] The oil-phase solvent includes at least one of the following raw materials: kerosene, isopropyl myristate, diisopropyl adipate, or dimethyl phthalate.

[0023] In one embodiment, the fragrance type of the essence is: wild chrysanthemum fragrance type, jasmine fragrance type, wormwood fragrance type, agarwood fragrance type, or sandalwood fragrance type.

[0024] In one embodiment, the boiling point of the essence is 100 - 350 °C.

[0025] In one embodiment, the coating further includes a bactericide and a synergist;

[0026] The bactericide includes at least one of 0.1 - 10 parts of essential oil for sterilization or bacteriostasis, 0.001 - 0.1 part of 2-methyl-4-isothiazolin-3-one, 0.001 - 0.1 part of 2-methyl-5-chloro-4-isothiazolin-3-one, or 0.05 - 0.1 part of 4-chloro-3,5-dimethylphenol;

[0027] The synergist includes 10 - 20 parts of piperonyl butoxide and / or piperonyl amine.

[0028] The present invention also provides a preparation method of the thin-film electric mosquito-repellent incense, including the following steps:

[0029] Preparing a coating solution: Dissolve a film-forming agent in water to obtain a film-forming agent solution, mix an insecticide with an oil-phase solvent to obtain an insecticide solution, mix the film-forming agent solution with the insecticide solution, and add essence to obtain a coating solution;

[0030] Preparing a thin-film substrate: Mix a substrate raw material, a solvent, and titanium dioxide, and heat to obtain a coating solution; the substrate raw material is polyethylene terephthalate, high-temperature resistant polypropylene, or polysulfone; apply a release agent on the surface of a drum, raise the temperature, extrude the coating solution onto the surface of the drum, perform biaxial stretching to form a biaxially stretched film, bake in a drying oven, wind up, cure, soak the cured biaxially stretched film with a forming solution, and bake in an oven to obtain a thin-film substrate;

[0031] Preparing a thin-film mosquito-repellent incense substrate: Heat the coating solution, apply it to the surface of the thin-film substrate, dry, and cool to form a coating attached to the thin-film substrate to obtain a thin-film mosquito-repellent incense substrate;

[0032] Preparing a thin-film electric mosquito-repellent incense: Wind one end of the thin-film mosquito-repellent incense substrate around a feeding reel, wind the other end around a take-up reel, and attach the thin-film mosquito-repellent incense substrate to a heating body, where the bonding surface between the thin-film mosquito-repellent incense substrate and the heating body is the thin-film substrate, to obtain a thin-film electric mosquito-repellent incense.

[0033] Using titanium dioxide as one of the raw materials of the coating solution is for matting, increasing friction, improving the surface roughness of the prepared thin-film substrate, and further enhancing the bonding force between the thin-film substrate and the coating.

[0034] In one embodiment, in the step of preparing the thin-film substrate, the solvent includes at least one of the following raw materials: ethyl acetate, n-heptane, or dimethyl sulfoxide; the release agent is dimethyl silicone oil, the temperature increase is to 80 - 120 °C, the aspect ratio of the biaxially stretched film is 6:(9 - 3); the temperature of baking in the drying oven is: 80 - 120 °C, 50 - 80 °C, 30 - 50 °C; the temperature of curing is 55 ± 5 °C, and the curing time is 6 - 18 h;

[0035] The forming liquid includes at least one of the following raw materials: toluene, xylene, ethyl acetate, or N,N-dimethylformamide; the temperature of the soaking is 30-40°C, and the time of the soaking is 24-48 h; the temperature of the oven baking is 80-100°C, and the time of the oven baking is 18-48 h.

[0036] In one embodiment, in the step of preparing the thin-film electric mosquito-repellent incense, it further includes a cutting step before winding one end of the thin-film mosquito-repellent incense substrate around the unwinding reel. The cutting step includes: cutting the thin-film mosquito-repellent incense substrate into strips, the width of the strips is 3-6 mm, and the length is 0.5-5 m.

[0037] In one embodiment, in the step of preparing the thin-film mosquito-repellent incense substrate, the coating liquid is heated to 90°C, the thickness of the coating is 25±3 μm, and the drying temperature is 20-25°C.

[0038] In one embodiment, the using method of the thin-film electric mosquito-repellent incense includes the following steps: making the temperature of the heating body be 90-110°C, starting the unwinding reel and the winding reel, the winding reel rotates driven by the power source, driving the thin-film mosquito-repellent incense substrate to move against the heating body, and making the insecticide in the coating volatilize by heating.

[0039] In one embodiment, the release agent is dimethyl silicone oil, the kinematic viscosity of the dimethyl silicone oil is 800-3000 (25°C) mm4 / s, the flash point is 288 to 300°C, and the freezing point is -50 to -55°C.

[0040] In one embodiment, in the step of preparing the thin-film substrate, the substrate raw material, the solvent, and titanium dioxide are mixed and heated to 260-280°C to form a coating liquid.

[0041] In one embodiment, the substrate raw material is polyethylene terephthalate, the solvent is ethyl acetate, and the polyethylene terephthalate includes polyethylene terephthalate with a molecular weight of 5000-8000, polyethylene terephthalate with a molecular weight of 8000-18000, and polyethylene terephthalate with a molecular weight of 20000-30000;

[0042] For the polyethylene terephthalate with a molecular weight of 5000-8000, the polyethylene terephthalate with a molecular weight of 8000-18000, the polyethylene terephthalate with a molecular weight of 20000-30000, the weight ratio of the ethyl acetate to the titanium dioxide is (20-50):(30-60):(5-20):(5-20):(0.001-0.1).

[0043] In one embodiment, the polyethylene terephthalate with a molecular weight of 5000 - 8000, the polyethylene terephthalate with a molecular weight of 8000 - 18000, the polyethylene terephthalate with a molecular weight of 20000 - 30000, and the weight ratio of ethyl acetate to titanium dioxide is 50:50:10:12:0.05.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] A film - type electric mosquito repellent and its preparation method of the present invention. The film - type electric mosquito repellent is composed of a film - type mosquito repellent substrate and an electric heater. It does not require a large amount of solvent oil, and there is no need to change the sheet daily during use. It is heated by a specially designed electric heater, enabling the insecticidal components to stably volatilize into the room. There is no open flame, no soot generated, and the drug residue is low after use, which is safer and more environmentally friendly. Description of the Drawings

[0046] Figure 1 It is the film - type electric mosquito repellent in Example 2, where 1 is the pay - off reel, 2 is the heating body, 3 is the take - up reel, 4 is the film - type mosquito repellent substrate, 5 is the first fixed shaft, and 6 is the second fixed shaft. Detailed Embodiments

[0047] To facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0048] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements at the same time.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0050] Definition:

[0051] Polyethylene terephthalate: The English name abbreviation is PET, and the CAS number is 25038 - 59 - 9.

[0052] High-temperature resistant polypropylene: In the present invention, it refers to polypropylene with a maximum tolerance temperature of 110 - 142 °C and a melting point of 145 - 165 °C.

[0053] Polysulfone: It is a thermoplastic resin containing a sulfone group (-SO2-) and an arylene group in the molecular main chain, and its English name abbreviation is PSU.

[0054] Unless otherwise specified, the reagents, materials, and equipment used in this example are all commercially available sources; unless otherwise specified, the experimental methods are all conventional experimental methods in this field.

[0055] Example 1

[0056] A film substrate.

[0057] Prepare a polyethylene terephthalate (PET) film substrate.

[0058] I. Apply a silicone-based release agent on a mirror stainless steel drum with a thickness of 6 - 8 μm. The release agent is a high-temperature type dimethyl silicone oil with a kinematic viscosity of 800 - 3000 (25 °C) MM4 / S, a flash point of 288 to 300 °C, and a freezing point of -50 to -55 °C. In this example, the release agent is dimethyl silicone oil with a kinematic viscosity of 3000 (25 °C) MM4 / S, a flash point of 300 °C, and a freezing point of -55 °C.

[0059] II. Mix the substrate raw materials, solvent, and titanium dioxide, and heat to 260 to 280 °C to form a coating solution.

[0060] The above-mentioned substrate raw materials are polyethylene terephthalate, the above-mentioned solvent is ethyl acetate, and the above-mentioned polyethylene terephthalate includes polyethylene terephthalate with a molecular weight of 5000 - 8000, polyethylene terephthalate with a molecular weight of 8000 - 18000, and polyethylene terephthalate with a molecular weight of 20000 - 30000;

[0061] The weight ratio of the above-mentioned polyethylene terephthalate with a molecular weight of 5000 - 8000, the above-mentioned polyethylene terephthalate with a molecular weight of 8000 - 18000, the above-mentioned polyethylene terephthalate with a molecular weight of 20000 - 30000, the above-mentioned ethyl acetate to the titanium dioxide is (20 - 50) : (30 - 60) : (5 - 20) : (5 - 20) : (0.001 - 0.1).

[0062] In this embodiment, polyethylene terephthalate with a molecular weight of 5000 - 8000, polyethylene terephthalate with a molecular weight of 8000 - 18000, polyethylene terephthalate with a molecular weight of 20000 - 30000, and the weight ratio of ethyl acetate to the titanium dioxide is 50:50:10:12:0.05. Third, raise the temperature of the stainless-steel drum to 100 to 110 °C, extrude the coating solution through a T-shaped nozzle onto the stainless-steel drum to form an amorphous thick sheet, and longitudinally and transversely stretch the amorphous thick sheet through a biaxial stretching machine to form a biaxially stretched film, with an aspect ratio of 6:9 to 6:3.

[0063] In this embodiment, the aspect ratio is 6:4.

[0064] Fourth, the biaxially stretched film enters the drying oven, the drying oven temperature is 80 - 120 °C, 50 - 80 °C, 30 - 50 °C, and the length of the drying oven is 3 - 8 meters.

[0065] Fifth, wind up the film, cure it in an oven at 55 ± 5 °C for 6 - 18 hours to obtain a film substrate without micropores.

[0066] Sixth, immerse the film in the forming solution at 30 - 40 °C for 24 - 48 hours. The forming solution includes at least one of the following raw materials: toluene, xylene, ethyl acetate, or N,N-dimethylformamide (DMF). In this embodiment, the forming solution is xylene.

[0067] Seventh, after immersion, the film enters an oven at 80 - 100 °C and is baked for 18 - 48 hours. A film substrate with micropores is obtained, with a porosity of 24% to 40%, a pore diameter of 0.5 - 10 μm, and a thickness of 25 μm. The surface of the above film substrate facing the steel belt is a smooth surface, and the surface facing the air is a rough surface.

[0068] Example 2

[0069] A thin-film type electric mosquito repellent incense.

[0070] Prepare the thin-film type electric mosquito repellent incense from the film substrate obtained in Example 1.

[0071] The preparation method of the thin-film type electric mosquito repellent incense is as follows:

[0072] First, prepare the coating solution.

[0073] 1. Weigh the film-forming agent, water, insecticide, oil-phase solvent, and essence of this embodiment according to Table 1, and slowly dissolve or disperse the film-forming agent and water under the water bath condition of 80 - 99 °C to obtain a film-forming agent solution.

[0074] 2. Mix the insecticide and the oil-phase solvent to obtain an insecticide solution.

[0075] 3. Slowly add the pesticide solution to the film-forming agent solution under stirring, keep the water bath temperature at 85°C, and stir for 1 h.

[0076] 4. Finally, add the essence, seal it for storage, and keep it for use.

[0077] Table 1 Raw materials and weight parts of each example of the coating solution

[0078]

[0079] Note: The film specifications of the examples are all: pore size 0.5 - 10 μm, thickness 25 μm, which are indicated by "√" in Table 1.

[0080] II. Prepare the film substrate.

[0081] III. Prepare the film-type mosquito-repellent incense substrate.

[0082] In this example, the film substrate is a PET film with micropores having a pore size of 0.5 - 10 μm. The thickness of the film substrate is 25 μm, the porosity is 24% to 40%, and it has a smooth surface and a rough surface.

[0083] Cut the film substrate into a coil with a width of 50 cm and a length of 100 m, and hang it in the coating equipment. The coating equipment includes a unwind reel, a doctor blade roller, a drying oven, a wind-up reel, and a liquid medicine tank, where the temperature adjustable range of the liquid medicine tank is from room temperature to 100°C.

[0084] Heat the coating solution to 90°C through the liquid medicine tank, then introduce it into the doctor blade roller. At the same time, introduce the film substrate into the unwind device. Select the rough surface of the film substrate to coat the coating solution. Uniformly and continuously scrape the coating solution onto the rough surface of the film substrate through the doctor blade roller. Set the coating thickness to 25 μm ± 3 μm. The weight part ratio of the film substrate to the pesticide in the coating is (1 - 4):1. In this example, the weight part ratio of the film substrate to the pesticide in the coating is 1.51:1. Then dry it through a drying oven at a temperature of 20 - 25°C, cool it, and the coating solution adheres to the film substrate to form a coating, and wind it up to obtain the film-type mosquito-repellent incense substrate.

[0085] IV. Prepare the film-type electric mosquito-repellent incense.

[0086] The film-type electric mosquito-repellent incense includes a film-type mosquito-repellent incense substrate and an electric heater. The electric heater is composed of an unwind reel, a heating element, and a wind-up reel. The heating element is located between the unwind reel and the wind-up reel. In this example, the heating element is a PTC heating element. In this example, the wind-up reel is driven by a power source to rotate. The power source includes: electric power, human power, mechanical power, that is, the wind-up reel can be driven by a micro motor, or rotated manually, or driven by a metal elastic body. The wind-up reel can rotate continuously or intermittently.

[0087] Cut the thin-film mosquito-repellent incense base material into strips with a width of 5 mm and a length of 50 mm. Then wind one end of the strip-shaped thin-film mosquito-repellent incense base material around the feeding reel, pass the other end through the first fixed shaft, then pass above the heating element, and finally pass through the second fixed shaft and wind it around the take-up reel, so that the surface of the thin-film mosquito-repellent incense base material where the thin-film base material is located is closely attached to the heating element, and the surface where the thin-film base material is located is heated to obtain the thin-film electric mosquito-repellent incense, as Figure 1 shown.

[0088] V. Use the thin-film electric mosquito-repellent incense.

[0089] 1. Working principle of the thin-film electric mosquito-repellent incense:

[0090] One end of the thin-film mosquito-repellent incense base material is wound around the feeding reel, and the other end is wound around the take-up reel. After the user turns on the power source, the take-up reel rotates under the drive of the power source, continuously and slowly winds the thin-film mosquito-repellent incense base material, and at the same time drives the thin-film mosquito-repellent incense base material to make the feeding reel rotate together, continuously and slowly releasing the thin-film mosquito-repellent incense base material. The thin-film mosquito-repellent incense base material located between the feeding reel and the take-up reel moves past the heating element at a certain speed, and the surface in contact with the heating element is the surface where the thin-film base material is located. The temperature of the heating element causes the insecticide and other volatile components (including auxiliaries such as fragrance, solvent, synergist, etc.) in the coating to be heated and move from the thin-film and thin-film coating, volatilize into the air, achieving the purpose of repelling and killing mosquitoes; at the same time, due to the drive of the take-up reel, new thin-film mosquito-repellent incense base material is continuously heated, enabling the thin-film electric mosquito-repellent incense to stably and continuously heat and volatilize the mosquito-repellent components.

[0091] 2. Operating method of the thin-film electric mosquito-repellent incense:

[0092] Turn on the power source to make the take-up reel rotate, and drive the feeding reel to rotate in the same direction through the thin-film mosquito-repellent incense base material connected between the feeding reel and the take-up reel. By adjusting the rotation speed, control the moving speed of the thin-film mosquito-repellent incense base material so that the linear speed of the thin-film mosquito-repellent incense base material located between the feeding reel and the take-up reel reaches 0.8 cm / h, and the linear speed of the take-up reel is also 0.8 cm / h.

[0093] After turning on the power source, the usage data of the thin-film electric mosquito-repellent incense is shown in the following table.

[0094] Table 2 Usage data of the thin-film electric mosquito-repellent incense

[0095] <![CDATA[8h heating area cm 2 > 3.2 Film width cm 0.5 Walking length in 8h cm 6.4 Speed in 8h cm / h 0.8

[0096] VI. Comparison between the thin-film electric mosquito-repellent incense and the conventional electric mosquito-repellent tablets and electric mosquito-repellent liquids.

[0097] Since the amount of oil-phase solvent used in the film-type mosquito-repellent incense base material is relatively small, far lower than that in the electric mosquito-repellent liquid, the film-type mosquito-repellent incense base material can reduce the waste of non-renewable resources and carbon emissions while achieving a good mosquito-repellent effect.

[0098] At the same time, compared with traditional electric mosquito-repellent products, the film-type electric mosquito-repellent prepared with the film-type mosquito-repellent incense base material also has advantages in terms of raw material consumption. Specific examples are as follows:

[0099] The weight of a single electric mosquito-repellent tablet is about 0.9 g, of which the weight of the liquid medicine is about 0.12 g, and the amount of insecticide used is about 0.012 g. The usage duration of a single tablet is 12 h, and due to material limitations, it cannot be used continuously.

[0100] The net weight of a bottle of electric mosquito-repellent liquid is about 30 g, and the usage duration is about 40 nights. One night is 8 h, that is, the usage amount per night is about 0.75 g. The conventional electric mosquito-repellent liquid is composed of pyrethroid, essence, and oil-phase solvent. According to the proportion of each component, the amount of pyrethroid used for insecticidal purpose per night is about 0.0075 g. The plastic bottle, core rod, and plunger of the electric mosquito-repellent liquid are not included in the calculation.

[0101] For the film-type electric mosquito-repellent, the film area used every 8 h is about 3.2 cm 2 , after calculation and weighing, the weight of the film base material of the 3.2 cm 2 film-type mosquito-repellent incense base material is about 0.0091 g, and the weight of the film-type mosquito-repellent incense base material is about 0.04 g (i.e., the total weight including the film base material and the coating). After calculation, the amount of insecticide used is about 0.006 g.

[0102] It can be seen that the raw material consumption of the film-type electric mosquito-repellent is much lower than that of the electric mosquito-repellent tablet and the electric mosquito-repellent liquid, which is more energy-saving and is a green and environment-friendly product that saves non-renewable resources.

[0103] Example 3

[0104] The differences between Example 3 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the film-type mosquito-repellent incense base material, the heating element structure, the usage method are the same as those in Example 2.

[0105] Example 4

[0106] The differences between Example 4 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the film-type mosquito-repellent incense base material, the heating element structure, the usage method are the same as those in Example 2.

[0107] Example 5

[0108] The differences between Example 5 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the film-type mosquito-repellent incense base material, the heating element structure, the usage method are the same as those in Example 2.

[0109] Comparative Example 1

[0110] The differences between Comparative Example 1 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the thin-film mosquito-repellent incense base material, the heating element structure, the usage method are the same as those of Example 2.

[0111] Comparative Example 2

[0112] The differences between Comparative Example 2 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the thin-film mosquito-repellent incense base material, the heating element structure, the usage method are the same as those of Example 2.

[0113] Comparative Example 3

[0114] The differences between Comparative Example 3 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the thin-film mosquito-repellent incense base material, the heating element structure, the usage method are the same as those of Example 2.

[0115] Comparative Example 4

[0116] The differences between Comparative Example 4 and Example 2 are shown in Table 3. The other raw materials, the preparation method of the thin-film mosquito-repellent incense base material, the heating element structure, the usage method are the same as those of Example 2.

[0117] Table 3 Specific data of each example and comparative example

[0118]

[0119] Experimental Example

[0120] The residual rate of the thin-film electric mosquito-repellent incense of each example and comparative example was detected.

[0121] I. Detection method.

[0122] 1. Residual rate test method: Use a gas chromatograph to test the initial content (tetramethrin content) of the insecticide in the thin film, record it as V1. After use, test the content of the insecticidal component in the thin film after use, record it as V2. The residual rate = V2 / V1 * 100%, and retain 1 decimal place.

[0123] 2. Knockdown rate test method: Adopt GB / T13917.10 Indoor efficacy test and evaluation of hygienic insecticides for pesticide registration - Part 10: Simulated field; Test insects: Culex pipiens pallens sensitive strain, Device: 28m 3 Simulated chamber, Method: Release 100 test insects into the simulated field. After the test insects return to normal activities, place the test agent in the center of the ground, turn on the power supply or light the test agent, and fumigate for 60 min. Record the number of knocked-down test insects and the total number of test insects once, and calculate the knockdown rate. Knockdown rate = Number of knocked-down test insects / Total number of test insects × 100%.

[0124] II. Test results.

[0125] The test results of each embodiment and comparative example are shown in the following table.

[0126] Table 4 Test Results of Each Embodiment and Comparative Example

[0127]

[0128]

[0129] Note: For the products of each of the above embodiments and comparative examples, parallel tests of the knockdown rate for 1 hour and parallel tests of the residual rate were carried out 3 times respectively. Among them, the results of the parallel tests of the knockdown rate were: knockdown rate 1 for 1 hour, knockdown rate 2 for 1 hour, knockdown rate 3 for 1 hour, and the knockdown rate for 1 hour was the average value of the 3 parallel tests. The results of the parallel tests of the residual rate were: residual rate 1, residual rate 2, residual rate 3, and the residual rate was the average value of the 3 parallel tests..

[0130] The results show that in Comparative Example 1, although the knockdown rate for 1 hour was relatively high and the residual rate was relatively low, due to the excessive use of the insecticidal ingredient (film width of 2 cm, heating element size of 2 * 0.5), it would have an adverse impact on humans and the ecological environment, so it was not adopted.

[0131] Compared with Example 2, Comparative Example 2 adopted the same linear velocity and heating element temperature. The difference was that the film width was narrower than that of Example 2, and in order to correspond to the film, the width of the heating element was also adjusted accordingly, so its heating area became smaller accordingly. The knockdown rate of Comparative Example 2 was worse than that of Example 2, and the residual rate was the same as that of Example 2.

[0132] Compared with Example 2, Comparative Example 3 adopted the same linear velocity and film width. The difference was that the heating element temperature was lower than that of Example 2. The knockdown rate of Comparative Example 3 was significantly worse than that of Example 2, and the residual rate was significantly higher than that of Example 2.

[0133] Compared with Example 2, Comparative Example 4 adopted the same linear velocity and film width. The difference was that the heating element temperature was higher than that of Example 2. The knockdown rate of Comparative Example 4 was the same as that of Example 2, and there was no significant difference in the residual rate compared with Example 2.

[0134] The technical features of each of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0135] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A thin-film electric mosquito-repellent incense, characterized in that, It includes a thin-film mosquito-repellent incense base material and an electric heater. The electric heater includes a unwind reel, a heating element, and a windup reel. The heating element is disposed between the unwind reel and the windup reel. One end of the thin-film mosquito-repellent incense base material is wound around the unwind reel, and the other end is wound around the windup reel. The windup reel drives the thin-film mosquito-repellent incense base material to move against the heating element. The rotation directions of the unwind reel and the windup reel are the same, and the linear velocity of the windup reel is 0.5 - 5 cm / h. The temperature of the heating element is 90 - 110 °C. The thin-film mosquito-repellent incense base material includes a thin-film base material and a coating. The coating includes an insecticide. The coating adheres to the thin-film base material. The surface of the thin-film mosquito-repellent incense base material that fits with the heating element is the thin-film base material. The thin-film base material is provided with micropores. The aperture of the micropores is 0.1 - 10 μm. The micropores are through holes, and the porosity is 15% to 40%. The thickness of the thin-film base material is 0.05 - 50 μm. The thin-film base material includes at least one of the following raw materials: polyethylene terephthalate, heat-resistant polypropylene, or polysulfone. The heat-resistant polypropylene is polypropylene with a maximum heat resistance temperature of 110 - 142 °C. The weight ratio of the thin-film base material to the insecticide is (1 - 4):

1. The coating includes the following raw materials in the following weight ratios: 25 parts of insecticide 33.5 parts of oil-phase solvent 25 parts of film-forming agent 5 - 20 parts of water 0.1 - 5 parts of essence; The insecticide includes at least one of the following raw materials: metofluthrin, chlorofludion, allethrin, propargite, transfluthrin, heptaflumetofluthrin, or metofluthrin. The oil-phase solvent includes at least one of the following raw materials: kerosene, isopropyl myristate, diisopropyl adipate, or dimethyl phthalate. The film-forming agent includes at least one of the following raw materials: glyceryl stearate, polyethylene glycol, sodium carboxymethyl cellulose, sodium hydroxymethyl cellulose, or hydroxypropyl methyl cellulose.

2. The thin-film electric mosquito-repellent incense according to claim 1, wherein The width of the heating element is the same as the width of the thin-film mosquito-repellent incense base material. The width of the thin-film mosquito-repellent incense base material is 0.5 - 1 cm.

3. The thin-film electric mosquito-repellent incense according to claim 1, wherein The heating element is a PTC heating element, a carbon fiber heating element, an infrared heater, or a heating resistor.

4. The preparation method of the thin-film electric heating mosquito-repellent incense according to any one of claims 1-3, characterized in that, It includes the following steps: Prepare the coating solution: Dissolve the film-forming agent in water to obtain a film-forming agent solution. Mix the insecticide with the oil-phase solvent to obtain an insecticide solution. Mix the film-forming agent solution and the insecticide solution, and add essence to obtain the coating solution. Prepare the thin-film base material: Mix the base material raw materials, solvent, and titanium dioxide, and heat to obtain a coating solution. The base material raw materials are polyethylene terephthalate, heat-resistant polypropylene, or polysulfone. Apply a release agent to the surface of the drum, heat up, extrude the coating solution onto the surface of the drum, perform biaxial stretching to form a biaxially stretched film, bake in a drying oven, wind up, cure, soak the cured biaxially stretched film with a forming solution, and bake in an oven to obtain the thin-film base material. Prepare the thin-film mosquito-repellent incense base material: Heat the coating solution, apply it to the surface of the thin-film base material, dry, and cool to form a coating adhering to the thin-film base material to obtain the thin-film mosquito-repellent incense base material. Preparation of a thin-film electric mosquito repellent incense: One end of the thin-film mosquito repellent incense substrate is wound around the pay-off reel, and the other end is wound around the take-up reel. The thin-film mosquito repellent incense substrate is attached to the heating body, and the bonding surface between the thin-film mosquito repellent incense substrate and the heating body is the thin-film substrate, thus obtaining the thin-film electric mosquito repellent incense.

5. The preparation method according to claim 4, wherein In the step of preparing the thin-film substrate, the solvent includes at least one of the following raw materials: ethyl acetate, n-heptane, or dimethyl sulfoxide; the release agent is dimethyl silicone oil, the temperature rise is to 80 - 120 °C, the aspect ratio of the biaxially oriented film is 6:(9 - 3); the temperature of baking in the baking tunnel is: 80 - 120 °C, 50 - 80 °C, 30 - 50 °C; the curing temperature is 55 ± 5 °C, and the curing time is 6 - 18 h; The forming liquid includes at least one of the following raw materials: toluene, xylene, ethyl acetate, or N,N-dimethylformamide; the soaking temperature is 30 - 40 °C, the soaking time is 24 - 48 h; the temperature of baking in the oven is 80 - 100 °C, and the baking time in the oven is 18 - 48 h.

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