A self-volatilizing mosquito-repellent incense and its preparation method

Abstract

The present invention relates to a self-volatile mosquito-repellent incense and a preparation method thereof, belonging to the technical field of daily chemicals. The self-volatile mosquito-repellent incense includes a film-type mosquito-repellent incense base material and a plurality of grid plates, and the film-type mosquito-repellent incense base material is fixed between the grid plates in a folded or bent form; the film-type mosquito-repellent incense base material includes a film base material and a coating, the coating adheres to the film base material, and the film base material is provided with micropores; the film base material includes at least one of the following raw materials: polyethylene terephthalate, polypropylene, polysulfone, polyhexamethylene adipamide, or cellulose acetate; the coating includes a mosquito repellent, and the weight ratio of the film base material to the mosquito repellent is (1-4):1. Through a large surface area, the self-volatile mosquito-repellent incense enables the mosquito repellent with a boiling point level of up to 300 °C to be easily volatilized, has a good mosquito-repellent effect, and can also reduce the usage amount of the oil-phase solvent. At the same time, the film-type mosquito-repellent incense base material adjusts the air permeability in the self-volatile mosquito-repellent incense by adjusting the pore diameter and quantity of the micropores, and makes the mosquito repellent better disperse by means of an appropriate ventilation effect.

Description

Technical Field

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

[0002] In recent years, mosquito-repellent fans have been deeply welcomed by consumers due to their advantages such as convenient use, good safety, delicate appearance, and wide range of usage scenarios. However, compared with traditional black mosquito-repellent incense and electric mosquito-repellent incense, their effects are relatively poor, so their market prospects are severely restricted.

[0003] Another emerging mosquito-repellent product - mosquito-repellent hanging ornaments - impregnates insecticidal components into plastics or fibers and then repels mosquitoes through natural volatilization. Although it is convenient to use, its promotion is also limited due to its mosquito-repellent effect. Summary of the Invention

[0004] In view of the above problems, the present invention provides a self-volatile mosquito-repellent incense. Through a large surface area, the mosquito-repellent agent with a boiling point level of up to 300 °C is easy to volatilize. Moreover, the film-type mosquito-repellent incense substrate has a better mosquito-repellent effect by coating a layer containing a mosquito-repellent agent on a polymer material, and can also reduce the usage amount of the oil-phase solvent. At the same time, the film-type mosquito-repellent incense substrate is provided with countless fine micropores. By folding or bending the film-type mosquito-repellent incense substrate, the pore diameter and quantity of the micropores are adjusted, thereby adjusting the air permeability in the self-volatile mosquito-repellent incense, and making the mosquito-repellent agent better disperse by means of an appropriate ventilation effect.

[0005] To achieve the above object, the present invention provides a self-volatile mosquito-repellent incense, including a film-type mosquito-repellent incense substrate and a plurality of grid plates, and the film-type mosquito-repellent incense substrate is fixed between the grid plates in a folded or bent form;

[0006] The film-type mosquito-repellent incense substrate includes a film substrate and a coating, the coating is attached to the film substrate, and the film substrate is provided with micropores;

[0007] The film substrate includes at least one of the following raw materials: polyethylene terephthalate, polypropylene, polysulfone, polyhexamethylene adipamide, or cellulose acetate;

[0008] The coating includes a mosquito-repellent agent, and the weight ratio of the film substrate to the mosquito-repellent agent is (1 - 4):1.

[0009] In one embodiment, the pore diameter of the micropores is 0.1 - 10 μm, the micropores are through holes, and the porosity of the micropores is 15% to 40%; the thickness of the film substrate is 8 - 120 μm.

[0010] In one embodiment, the pore diameter of the micropores is 0.5 - 10 μm, and the porosity of the micropores is 20% - 40%; the thickness of the film substrate is 100 ± 10 μm; the film substrate comprises at least one of the following raw materials: polyethylene terephthalate, polypropylene, polysulfone, or cellulose acetate.

[0011] In one embodiment, the thickness of the film substrate is 100 μm.

[0012] Using micropores with the above pore diameters can enable the coating to better adhere to the film substrate, and the coating liquid is not easily lost during the preparation process. If the prepared film-type mosquito-repellent incense substrate is used by heating, the above micropores can more facilitate the volatilization of the insecticidal components and are not easily left with residues; using the above thickness can make the film-type mosquito-repellent incense substrate light and does not occupy too much volume; the film-type mosquito-repellent incense substrate prepared from the above raw materials can withstand high temperatures, has strong solvent resistance, and good processing performance, and has a low residue of insecticidal components during use.

[0013] In one embodiment, the coating comprises raw materials in the following weight ratios:

[0014]

[0015] In one embodiment, the film-forming agent comprises at least one of the following raw materials: polyethylene glycol, sodium carboxymethyl cellulose, sodium hydroxymethyl cellulose, or hydroxypropyl methyl cellulose;

[0016] The oil-phase solvent comprises an ester solvent.

[0017] In one embodiment, the mosquito repellent comprises at least one of the following raw materials: transfluthrin, metofluthrin, IR3535, DEET, or hydropiperonyl butoxide;

[0018] The oil-phase solvent comprises at least one of the following raw materials: isopropyl myristate, or ethyl acetate;

[0019] The synergist comprises at least one of the following raw materials: citronella oil, menthol, limonene, α-pinene, vanillin, geraniol, or piperonyl butoxide.

[0020] In one embodiment, the coating further comprises 0.05 - 0.2 parts of nipagin ester and / or 0.05 - 0.2 parts of 4-chloro-3,5-dimethylphenol.

[0021] In one embodiment, the boiling point of the essence is 80 - 200 °C.

[0022] In one embodiment, the fragrance type of the essence is: sweet orange, jasmine, wild chrysanthemum, wormwood, or mint.

[0023] The present invention also provides a method for preparing the self-volatile mosquito-repellent incense, comprising the following steps:

[0024] Preparing a coating solution: Dissolve a film-forming agent in water to obtain a film-forming agent solution, mix a mosquito repellent, a synergist and an oil-phase solvent to obtain a mosquito repellent solution, mix the film-forming agent solution and the mosquito repellent solution, and add essence to obtain a coating solution;

[0025] Preparing a 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 tunnel, wind up, and cure to obtain a film substrate;

[0026] Preparing a film-type mosquito-repellent incense substrate: Heat the coating solution, apply it to the surface of the film substrate, dry it, and cool it to form a coating attached to the film substrate to obtain a film-type mosquito-repellent incense substrate;

[0027] Preparing the self-volatile mosquito-repellent incense: Fold the film-type mosquito-repellent incense substrate and fix it between grid plates to obtain the self-volatile mosquito-repellent incense.

[0028] In one embodiment, in the step of preparing the film substrate, an immersion after the curing step is further included, and the immersion comprises the following steps: Immerse the cured biaxially stretched film with a forming solution, and bake it in an oven to obtain a film substrate.

[0029] In one embodiment, the forming solution comprises at least one of the following raw materials: toluene, xylene, ethyl acetate, N,N-dimethylformamide, or methyl acetate; the solvent comprises at least one of the following raw materials: ethyl acetate, n-heptane, dimethyl sulfoxide, or ethylene glycol diacetate; the temperature of the immersion is 30-40 °C, the time of the immersion is 24-48 h; the temperature of the oven baking is 80-100 °C, the time of the oven baking is 18-48 h;

[0030] 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 the drying tunnel baking is: 80-120 °C, 50-80 °C, 30-50 °C; the temperature of the curing is 55±5 °C, and the curing time is 6-18 h.

[0031] In one embodiment, in the step of preparing the film-type mosquito-repellent incense substrate, the coating solution is heated to 90 °C, the thickness of the coating is 100 μm±10 μm, and the drying temperature is 20-25 °C.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] A self-volatile mosquito-repellent incense and its preparation method according to the present invention. Through a large surface area, the mosquito repellent with a boiling point level as high as 300 °C is easy to volatilize. And the film-type mosquito-repellent incense base material has a better mosquito-repellent effect by coating a coating containing a mosquito repellent on a polymer material, and can also reduce the usage amount of the oil-phase solvent. At the same time, the film-type mosquito-repellent incense base material is provided with countless fine micropores. By folding or bending the film-type mosquito-repellent incense base material, the pore diameter and quantity of the micropores are adjusted, thereby adjusting the air permeability in the self-volatile mosquito-repellent incense, and making the mosquito repellent better disperse by using an appropriate ventilation effect. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of the self-volatile mosquito-repellent incense in Example 5. Among them, 1 is the film-type mosquito-repellent incense base material, and 2 is the grid plate;

[0035] Figure 2 It is a schematic structural diagram of the film-type mosquito-repellent incense base material for preparing the self-volatile mosquito-repellent incense in Example 5. Among them, 3 is the coating, and 4 is the film base material. Detailed Embodiments

[0036] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The 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, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "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 an intermediate element at the same time.

[0038] 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 specification of the present invention herein 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.

[0039] Definition:

[0040] Polyethylene terephthalate: The English name abbreviation is PET, and the CAS number is 25038-59-9.

[0041] Polysulfone: It is a thermoplastic resin containing a sulfone group (-SO2-) and an arylene group in the molecular main chain, and the English name abbreviation is PSU.

[0042] Source:

[0043] Unless otherwise specified, the reagents, materials, and equipment used in this example are all commercially available; unless otherwise specified, the experimental methods are all conventional experimental methods in this field.

[0044] The raw materials and weight portions of each example and comparative example of the present invention are shown in the following table.

[0045] Table 1 Raw materials and weight portions of each example and comparative example

[0046]

[0047]

[0048] Note: Film substrate specification A: thickness 100 ± 10 μm, pore diameter 0.5 - 10 μm, porosity 20 - 30%;

[0049] Film substrate specification B: thickness 100 ± 10 μm, pore diameter 0.5 - 10 μm, porosity 30 - 40%;

[0050] Film substrate specification C: thickness 100 ± 10 μm, pore diameter 0.5 - 10 μm, porosity 40 - 50%;

[0051] Film substrate specification D: thickness 100 ± 10 μm, pore diameter 0.5 - 10 μm, porosity 0 - 1%.

[0052] Example 1

[0053] A film substrate.

[0054] Prepare a polyethylene terephthalate (PET) film substrate.

[0055] 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 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 a 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.

[0056] II. Mix the substrate raw materials, solvent, and titanium dioxide, and heat to 260 to 280°C to form a coating solution.

[0057] The above-mentioned base material raw material is 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;

[0058] For 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 weight ratio of the above-mentioned ethyl acetate to the titanium dioxide is (20 - 50) : (30 - 60) : (5 - 20) : (5 - 20) : (0.001 - 0.1).

[0059] In this embodiment, 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 ethyl acetate to the titanium dioxide is 50 : 50 : 10 : 12 : 0.05.

[0060] 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.

[0061] In this embodiment, the aspect ratio is 6 : 4.

[0062] 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.

[0063] Fifth, wind up the film, cure it in an oven at 55 ± 5 °C for 6 - 18 hours to obtain a film base material without micropores.

[0064] Sixth, immerse the film in the forming solution and immerse it 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.

[0065] Seventh, after immersion, the film enters an oven at 80 - 100 °C and is baked for 18 - 48 hours. A film base material with micropores is obtained, having a certain porosity, a pore diameter of 0.5 - 10 μm, and a thickness of 100 ± 10 μm. The surface of the above-mentioned film base material facing the steel belt is a smooth surface, and the surface facing the air is a rough surface.

[0066] Example 2

[0067] A thin film substrate.

[0068] Prepare a polypropylene (PP) thin film substrate.

[0069] In this example, the substrate raw material is polypropylene (PP), the solvent is n-heptane, and the forming liquid is toluene.

[0070] In this example, the weight ratio of polypropylene, n-heptane, and titanium dioxide is 40:60:20:0.05.

[0071] The remaining raw materials, preparation method are the same as those in Example 1.

[0072] Example 3

[0073] A thin film substrate.

[0074] Prepare a polysulfone (PSU) thin film substrate.

[0075] In this example, the substrate raw material is polysulfone, the solvent is dimethyl sulfoxide, and the forming liquid is N,N-dimethylformamide.

[0076] The above polysulfone includes polysulfone with a molecular weight of 10,000 - 30,000 and polysulfone with a molecular weight of 30,000 - 80,000.

[0077] In this example, the weight ratio of polysulfone with a molecular weight of 10,000 - 30,000, polysulfone with a molecular weight of 30,000 - 80,000, dimethyl sulfoxide, and titanium dioxide is 40:60:20:0.05.

[0078] Example 4

[0079] A thin film substrate.

[0080] Prepare a cellulose acetate thin film substrate.

[0081] In this example, the substrate raw material is cellulose acetate, the solvent is ethylene glycol diacetate, and the forming liquid is methyl acetate.

[0082] In this example, the weight ratio of cellulose acetate, ethylene glycol diacetate, and titanium dioxide is 100:20:0.05.

[0083] The cellulose acetate includes cellulose acetate with a molecular weight of 5,000 - 12,000 and cellulose acetate with a molecular weight of 20,000 - 30,000. The porosity is adjusted by adjusting the ratio of cellulose acetate with different molecular weights.

[0084] In this embodiment, the weight ratio of cellulose acetate with a molecular weight of 5000 - 12000 to cellulose acetate with a molecular weight of 20000 - 30000 is 1:1, and a cellulose acetate film substrate of film substrate specification C is prepared, with a porosity of 40 - 50%;

[0085] The weight ratio of cellulose acetate with a molecular weight of 5000 - 12000 to cellulose acetate with a molecular weight of 20000 - 30000 is 1:2, and a cellulose acetate film substrate of film substrate specification B is prepared, with a porosity of 30 - 40%;

[0086] The weight ratio of cellulose acetate with a molecular weight of 5000 - 12000 to cellulose acetate with a molecular weight of 20000 - 30000 is 1:3, and a cellulose acetate film substrate of film substrate specification A is prepared, with a porosity of 20 - 30%;

[0087] The weight ratio of cellulose acetate with a molecular weight of 5000 - 12000 to cellulose acetate with a molecular weight of 20000 - 30000 is 1:10, and a cellulose acetate film substrate of film substrate specification D is prepared, with a porosity of 0 - 1%.

[0088] Example 5

[0089] A self - volatilizing mosquito coil.

[0090] The preparation method of the self - volatilizing mosquito coil is as follows:

[0091] I. Prepare the coating solution.

[0092] 1. Weigh the film - forming agent, water, mosquito repellent, oil - phase solvent, synergist, essence, and preservative of this embodiment according to Table 1. 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.

[0093] 2. Mix the mosquito repellent, synergist, and oil - phase solvent to obtain a mosquito - repellent solution.

[0094] 3. Slowly add the mosquito - repellent solution to the film - forming agent solution under stirring, keep the water - bath temperature at 85 °C, and stir for 1 h.

[0095] 4. Finally, add the essence and preservative, seal and store for later use.

[0096] II. Prepare the film substrate.

[0097] Prepare the film substrate according to Example 1. The film substrate specification information obtained is shown in Table 1.

[0098] III. Prepare the film - type mosquito - coil substrate.

[0099] In this embodiment, the thin film substrate is a thin film substrate with pores having a pore size of 0.5 - 10 μm, and the porosity is as shown in Table 1. The thickness of the thin film substrate is 100 ± 10 μm, and it has a smooth surface and a rough surface.

[0100] The thin film substrate is cut into a coil with a width of 50 cm and a length of 100 m and hung in the coating equipment. The coating equipment includes an unwinding device, a doctor roll, a drying oven, a winding device, and a liquid medicine tank, where the temperature of the liquid medicine tank can be adjusted in the range from room temperature to 100 °C.

[0101] The coating liquid is heated to 90 °C in the liquid medicine tank and then introduced into the doctor roll. At the same time, the thin film substrate is introduced into the unwinding device. The rough surface of the thin film substrate is selected for coating the coating liquid. The coating liquid is evenly and continuously scraped onto the rough surface of the thin film substrate by the doctor roll, so that the thickness of the coating is 100 μm ± 10 μm, and the weight ratio of the thin film substrate to the insecticide in the coating is (1 - 4):1. In this embodiment, the weight ratio of the thin film substrate to the insecticide in the coating is 1.51:1. Then, it is dried and cooled in a drying oven at a temperature of 20 - 25 °C. The coating liquid adheres to the thin film substrate to form a coating, and it is wound up to obtain a thin film type mosquito coil substrate, as Figure 2 shown.

[0102] IV. Preparation of self-volatile mosquito coils.

[0103] The thin film type mosquito coil substrate is cut into sheets with a size of 10 cm × 50 cm. A 10 cm × 1 cm fold is made on the sheet with a paper folding machine, and the sheet is stretched to be in a Z shape or an S shape. Then, the folded sheet is fixed in a U-shaped frame, which is a U-shaped frame composed of grid plates with a size of 10 cm × 15 cm, to obtain a self-volatile mosquito coil, as Figure 1 shown.

[0104] Example 6

[0105] A self-volatile mosquito coil.

[0106] The thin film substrate obtained in Example 2 is prepared into a self-volatile mosquito coil.

[0107] The preparation method of the self-volatile mosquito coil is as follows: Weigh the raw materials of this embodiment according to Table 1, and other operations are the same as those in Example 5.

[0108] Example 7

[0109] A self-volatile mosquito coil.

[0110] The thin film substrate obtained in Example 3 is prepared into a self-volatile mosquito coil.

[0111] The preparation method of the self-volatile mosquito coil is as follows: Weigh the raw materials of this embodiment according to Table 1, and other operations are the same as those in Example 5.

[0112] Example 8

[0113] A self-volatilizing mosquito-repellent incense

[0114] The thin-film substrate obtained in Example 4 was made into a self-volatilizing mosquito-repellent incense

[0115] The preparation method of this self-volatilizing mosquito-repellent incense is as follows: Weigh the raw materials of this example according to Table 1, and other operations are the same as those in Example 5

[0116] Example 9 A self-volatilizing mosquito-repellent incense

[0117] The thin-film substrate obtained in Example 4 was made into a self-volatilizing mosquito-repellent incense

[0118] The preparation method of this self-volatilizing mosquito-repellent incense is as follows: Weigh the raw materials of this example according to Table 1, and other operations are the same as those in Example 5

[0119] Comparative Example 1

[0120] A self-volatilizing mosquito-repellent incense

[0121] The thin-film substrate obtained in Example 4 was made into a self-volatilizing mosquito-repellent incense

[0122] The preparation method of this self-volatilizing mosquito-repellent incense is as follows: Weigh the raw materials of this example according to Table 1, and other operations are the same as those in Example 5

[0123] Comparative Example 2

[0124] A self-volatilizing mosquito-repellent incense

[0125] The thin-film substrate obtained in Example 4 was made into a self-volatilizing mosquito-repellent incense

[0126] The preparation method of this self-volatilizing mosquito-repellent incense is as follows: Weigh the raw materials of this example according to Table 1, and other operations are the same as those in Example 5

[0127] Comparative Example 3

[0128] A self-volatilizing mosquito-repellent incense

[0129] The thin-film substrate obtained in Example 4 was made into a self-volatilizing mosquito-repellent incense

[0130] The preparation method of this self-volatilizing mosquito-repellent incense is as follows: Weigh the raw materials of this example according to Table 1, and other operations are the same as those in Example 5

[0131] Experimental Example

[0132] I. Testing the porosity of the thin-film substrate

[0133] The porosity of the film-type mosquito-repellent incense substrates corresponding to the above Examples 5-9 and Comparative Examples 1-3 was tested.

[0134] 1. Test purpose: The porosity of the film has a decisive influence on the loading capacity. The higher the porosity, the greater the loading capacity. However, at the same time, if the porosity is too high, it will affect the mechanical properties of the film, such as tensile strength. If the porosity is too high, it will also have a negative impact on the film coating, such as too strong film penetrability, etc. Therefore, the porosity range is evaluated from three aspects: loading capacity, tensile strength, and penetrability.

[0135] 2. Test method: The porosity test method is based on the Determination Method for the Porosity of Microporous Functional Films in GB / T 33052-2016

[0136] The density of cetane was measured according to GB / T611-2006 and denoted as p.

[0137] Cutting specimens: First, cut the specimens to be tested into 3 specimens with a length of not less than 10 cm and a width of not less than 5 cm each.

[0138] Use a thickness gauge to measure the thickness of the specimens. Select the cross in the middle of the specimens and measure no less than 5 points horizontally and vertically; then take the average value as the average thickness of the specimens, denoted as d; use a caliper to accurately measure the length (denoted as X) and width (denoted as Y) of the specimens, accurate to 0.02 mm.

[0139] Accurately measure the mass of the specimens with an electronic balance, accurate to 0.0001 g, and denoted as W1.

[0140] Place the cut specimens in a covered weighing bottle filled with cetane, so that the specimens are completely immersed in cetane. After soaking for 60 min ± 5 min, make the pores in the specimens completely filled with cetane, then take out the specimens and place them between two pieces of absorbent paper, and repeatedly squeeze them 10 times with a roller, and replace the absorbent paper 10 times. Finally, weigh the specimens filled with cetane and denote it as W2.

[0141] Result calculation: Calculate the volume V of the specimens, and the volume V of the specimens; calculate according to Equation (1):

[0142] V1 = X × Y × d... (1) In the formula:

[0143] V1 - The volume of the specimens, in cubic centimeters (cm³); X - The length of the specimens, in centimeters (cm); Y - The width of the specimens, in centimeters (cm); d - The thickness of the specimens, in centimeters (cm).

[0144] Calculate the volume V2 of the absorbed cetane. The volume V2 of the absorbed cetane is calculated according to Equation (2): V2 = (W2 - W1) / p... (2) In the formula:

[0145] V2—the volume of absorbed hexadecane, in cubic centimeters (cm3); W1—the mass of the sample before absorbing hexadecane, in grams (g); W2—the mass of the sample after fully absorbing hexadecane, in grams (g); p—the density of hexadecane, in grams per cubic centimeter (g / cm3).

[0146] Calculate the porosity P of the sample. The porosity P of the sample is calculated according to Equation (3):

[0147] P = (V2 / V1) × 100%... (3) where:

[0148] P—the porosity of the sample; V1—the volume of the sample, in cubic centimeters (cm3); V2—the volume of absorbed hexadecane, in cubic centimeters (cm3).

[0149] 3. The test results are shown in the following table.

[0150] Table 2 Porosity Test Results

[0151]

[0152]

[0153] Note: The thicknesses 1, 2, 3, 4, 5 in the above table are the results of parallel tests; W1-1, W1-2, W1-3 are the results of parallel tests, and W1 is the average value of W1-1, W1-2, W1-3; W2-1, W2-2, W2-3 are the results of parallel tests, and W2 is the average value of W2-1, W2-2, W2-3.

[0154] II. Test on the loading amount of the thin film coating.

[0155] 1. Test method: For the thin film mosquito-repellent incense substrates corresponding to Examples 5-9 and Comparative Examples 1-3, heat the coating liquid to 90°C in the liquid medicine tank, then introduce it into the doctor blade roller. At the same time, introduce the thin film substrate into the unwind device. Select the rough surface of the thin film substrate to coat the coating liquid. Uniformly and continuously scrape the coating liquid onto the rough surface of the thin film substrate through the doctor blade roller to make the thickness of the coating 110 μm, the coating width 19 cm, and the coating length 34 cm. Then dry it in an oven at 55°C for 15 min and cool it down.

[0156] 2. The test results are shown in the following table. Table 3 Test Results of the Loading Amount of the Thin Film Coating

[0157]

[0158] Note: The weights of the film substrates 1, 2, and 3 in the above table are the results of parallel tests, and the weight of the film substrate is the average of the weights of the film substrates 1, 2, and 3; the weights after coating 1, 2, and 3 are the results of parallel tests, and the weight after coating is the average of the weights after coating 1, the weight after coating 2, and the weight after coating 3.

[0159] III. Tensile strength test.

[0160] 1. Test method: Using the film-type mosquito-repellent incense substrates corresponding to Examples 5-9 and Comparative Examples 1-3, test according to the test method for tensile properties of plastic films in GB / T 13022-1991.

[0161] 2. The test results are shown in the following table.

[0162] Table 4 Tensile strength test results

[0163]

[0164] Note: The tensile strengths 1, 2, 3, 4, and 5 in the above table are the results of parallel tests, and the tensile strength is the average of the tensile strengths 1, 2, 3, 4, and 5.

[0165] As can be seen from the above table, the tensile strength of Comparative Example 1 is significantly worse than that of other examples and comparative examples.

[0166] IV. Residual rate test.

[0167] 1. Test method: Using the film-type mosquito-repellent incense substrates corresponding to Examples 5-9 and Comparative Examples 1-3, use a gas chromatograph to test the initial content (tetramethrin content) of the insecticidal component in the film, record it as V1, and after use, test the content of the insecticidal component in the film after use, record it as V2, and the residual rate = V2 / V1 * 100%, retaining 1 decimal place.

[0168] 2. The test results are shown in the following table.

[0169] Table 5 Residual rate test results

[0170]

[0171] Note: The residual rates 1, 2, and 3 in the above table are the results of parallel tests, and the residual rate is the average of the residual rates 1, 2, and 3.

[0172] As can be seen from the above table, the residual rate of Comparative Example 3 is significantly higher than that of other examples and comparative examples.

[0173] V. Test on the degree of peeling between the film substrate and the coating.

[0174] 1. Test method: For the film-based mosquito-repellent incense substrates corresponding to Examples 5-9 and Comparative Examples 1-3, cut the film into strips that are 1 cm wide and 5 cm long. Wind the strips around a reel with a diameter of 0.8 cm with the coating facing outwards, take them down and flatten them, and repeat 3 times. If the central part of the film substrate detaches or falls off, it is easily peelable; if there is a small amount of detachment at the edge of the film substrate, it is slightly easily peelable; if the film substrate does not detach, it is not easily peelable.

[0175] 2. The test results are shown in the following table.

[0176] Table 6 Test on the degree of peeling between the thin-layer substrate and the coating

[0177]

[0178] As can be seen from the above table, the bonding strength between the film substrate of Comparative Example 2 and the coating is significantly lower than that of other examples and comparative examples. VI. Biological effect detection.

[0179] Cut the film-based mosquito-repellent incense substrates prepared in Examples 5-9 into sheets that are 0.8 mm wide and 40 mm long for testing biological effects.

[0180] 1. Detection method.

[0181] Adopt GB / T13917.10 Indoor efficacy test and evaluation of hygienic insecticides for pesticide registration - Part 10: Simulated field; Test insects: Susceptible strain of Culex pipiens, Device: 28 m 3 Simulated room, 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 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%.

[0182] 2. Detection results.

[0183] Table 2 Detection results of biological effects

[0184]

[0185] Note: The knockdown rate experiments 1, 2, and 3 in the above table are the results of parallel tests.

[0186] The results show that the mosquito knockdown rates of the self-volatile mosquito-repellent incense in each example are better than those of commercially available mosquito-repellent fans and mosquito-repellent pendants.

[0187] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of 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.

[0188] The embodiments described above 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 self-volatilizing mosquito-repellent incense, characterized in that, It includes a thin-film mosquito-repellent incense base material and several grid plates, and the thin-film mosquito-repellent incense base material is fixed between the grid plates in a folded or bent form; The thin-film mosquito-repellent incense base material includes a thin-film base material and a coating. The coating adheres to the thin-film base material. The thin-film base material is provided with micropores. The pore diameter of the micropores is 0.5 - 10 μm, and the porosity of the micropores is 20% - 40%. The micropores are through holes; The thin-film base material includes at least one of the following raw materials: polyethylene terephthalate, polypropylene, polysulfone, or cellulose acetate; The coating includes a mosquito repellent, and the weight ratio of the thin-film base material to the mosquito repellent is (1 - 4):1; The coating includes the following raw materials in parts by weight: The mosquito repellent includes at least one of the following raw materials: transfluthrin, metofluthrin, IR3535, DEET, or hydropiperonyl butoxide; The oil-phase solvent includes at least one of the following raw materials: isopropyl myristate, or ethyl acetate; The film-forming agent includes at least one of the following raw materials: polyethylene glycol, sodium carboxymethyl cellulose, sodium hydroxymethyl cellulose, or hydroxypropyl methyl cellulose; The synergist includes at least one of the following raw materials: citronella oil, menthol, limonene, α-pinene, vanillin, geraniol, or piperonyl butoxide.

2. The self-volatilizing mosquito-repellent incense according to claim 1, wherein The thickness of the thin-film base material is 8 - 120 μm.

3. The self-volatilizing mosquito-repellent incense according to claim 2, wherein, The thickness of the thin-film base material is 100 μm.

4. The self-volatilizing mosquito-repellent incense according to claim 1, wherein The coating also includes 0.05 - 0.2 parts of parabens and / or 0.05 - 0.2 parts of 4-chloro-3,5-dimethylphenol.

5. The preparation method of the self-volatilizing mosquito-repellent incense according to any one of claims 1-4, 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 mosquito repellent, synergist, and oil-phase solvent to obtain a mosquito repellent solution. Mix the film-forming agent solution and the mosquito repellent solution, and add essence to obtain the coating solution; Prepare the thin-film base material: Mix the raw materials of the thin-film base material, solvent, and titanium dioxide, and heat to obtain a coating solution. Apply a release agent to the surface of the 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, and cure 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; Prepare the self-volatile mosquito-repellent incense: Fold the thin-film mosquito-repellent incense base material and fix it between the grid plates to obtain it.

6. The preparation method according to claim 5, characterized in that, In the step of preparing the thin-film base material, it also includes an immersion after the curing step. The immersion includes the following steps: Immerse the cured biaxially stretched film with a forming solution and bake it in an oven to obtain the thin-film base material.

7. The preparation method according to claim 6, characterized in that, The forming solution includes at least one of the following raw materials: toluene, xylene, ethyl acetate, N,N-dimethylformamide, or methyl acetate. The solvent includes at least one of the following raw materials: ethyl acetate, n-heptane, dimethyl sulfoxide, or ethylene glycol diacetate. The temperature of the immersion is 30 - 40 °C, and the time of the immersion 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; The release agent is dimethyl silicone oil, the temperature increase is to increase the temperature to 80 - 120 °C, the aspect ratio of the biaxially oriented film is 6:(9 - 3); the temperature for 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.

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