Long-acting insect repelling net as well as preparation method and application thereof

Abstract

The invention discloses a long-acting insect repelling net as well as a preparation method and application thereof. The preparation method of the long-acting insect repelling net is characterized by comprising the steps of spinning and forming a mixed solution, and weaving into a net, the mixed solution comprises: (a) an insect-expelling or insect-killing active component; and (b) is selected from one or more of polyurethane, polycaprolactone, nylon, polyethylene, polyvinyl alcohol and polyacrylonitrile. The long-acting insect-repelling net provided by the invention has excellent slow-release characteristic, so that insect-repelling or insect-killing active ingredients can be slowly released for a long time, and an excellent prevention and treatment effect is further maintained.

Description

Technical Field

[0001] The invention relates to the field of plant pest control, and more specifically, to a long-acting insect repellent net and a preparation method and application thereof. Background Art

[0002] For vine-extending and climbing crops, due to the pests’ harmful habits and the growth characteristics of the crops, the traditional pesticide spraying methods are often not ideal in actual pest control. For example, cowpeas have the characteristics of spreading new shoots and blooming in the morning and evening, and closing during the day, while bean thrips usually have hidden living habits. They are active in the early morning and evening to feed or reproduce, and bore into the tender leaves, flower buds and pods of crops at other times. This makes bean thrips avoid direct contact with pesticides, greatly reducing the effect of spraying. In order to effectively prevent and control pests such as thrips, farmers have to increase the number of pesticide spraying. Since the flowering period and harvest period of cowpeas overlap, this method of pesticide application also increases the risk of excessive pesticide residues in cowpeas, and it is difficult to meet the needs of long-term effective pest control.

[0003] In the process of planting vine-growing crops, it is common to use supports and nets to guide the growth of crops. A solution is to use the nets that need to be hung in the first place, soak or reserve insecticidal active ingredients in them, provide them with the opportunity to grow and continuously release the active ingredients.

[0004] Patent publication number CN106212108A discloses the use of nylon rope nets, in which water extracts of plantain and honeysuckle are loaded onto the nylon rope nets by an infiltration method for controlling pests on some crops. However, the honeysuckle and plantain extracts cannot effectively repel or kill insects such as thrips and needle bees; in addition, the infiltration method cannot effectively release the active ingredients in a controlled manner, and cannot achieve the purpose of long-term control of the insect population. Summary of the invention

[0005] In view of the above-mentioned existing technical problems, the primary purpose of the present invention is to provide a method for preparing a long-lasting insect repellent net. The long-lasting insect repellent net prepared by the preparation method can achieve long-term control of the insect population base and avoid large-scale outbreaks of pests.

[0006] The second object of the present invention is to provide a long-lasting insect repellent net prepared by the above preparation method.

[0007] The third object of the present invention is to provide a long-acting insect repellent net for use in repelling insects of creeping or climbing crops.

[0008] A fourth object of the present invention is to provide a method for repelling or killing insects.

[0009] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0010] The present invention claims a method for preparing a long-acting insect repellent net, comprising the steps of spinning a mixed liquid into a yarn and weaving the mixed liquid into a net;

[0011] The mixed solution comprises:

[0012] (a) anthelmintic or insecticidal active ingredients;

[0013] (b) one or more selected from polyurethane, polycaprolactone, nylon, polyethylene, polyvinyl alcohol, and polyacrylonitrile.

[0014] The inventors screened out suitable polymer materials based on the intermolecular pore size, melting temperature, and drug adsorption and sustained-release effects of different polymer materials. During the preparation process of the insect repellent net, the insect repellent or insecticidal active ingredients were directly added. The prepared insect repellent net has excellent long-term prevention and control effects.

[0015] The inventor speculates that, on the one hand, when adding insect repellent or insecticidal active ingredients during the preparation of the insect repellent net, suitable polymer materials can more effectively embed and fix the insect repellent or insecticidal active ingredients; on the other hand, during the melting and spinning process, the active ingredients can be better wrapped, reducing the volatilization loss of the active ingredients, thereby improving its load capacity. Based on this, the prepared long-lasting insect repellent net has excellent sustained-release properties, allowing the active ingredients to be slowly released over a long period of time, thereby maintaining excellent control effects. However, the infiltration method cannot effectively release the active ingredients slowly and control the insect population, and cannot achieve the goal of long-term control of the insect population.

[0016] The present invention selects suitable polymer materials according to the characteristics of traction and pulling of rope nets required for planting vines and climbing crops. Different active ingredient formulas can be matched to cope with different pests on different crops. While providing crops with vines, precise pesticide application is achieved, reducing spray application, labor costs and drug costs, controlling the insect population base within a low range for a long time, and greatly reducing pesticide residues.

[0017] The long-acting insect repellent net provided by the present invention is easy to operate, and its arrangement is consistent with that of the existing vine net. At the same time, the insect repellent net itself is low in cost, and can reduce the frequency of use of chemical pesticides, reduce pesticide residues, and reduce the labor cost of purchasing and applying pesticides. Therefore, the long-acting insect repellent net can not only meet the field management needs of creeping or climbing crops, but also show significant advantages in environmental protection and long-lasting effect, and has a wide range of application prospects.

[0018] Further preferably, the (b) is selected from one or more of polyurethane and polycaprolactone. The inventors have found through research that, compared with other materials, polyurethane and polycaprolactone have lower melting points and better thermoplasticity, so that they can more effectively embed and fix active ingredients during the preparation process, and can better wrap active ingredients, thereby achieving more excellent sustained release and prevention and treatment effects.

[0019] Specifically, the polyurethane is a thermoplastic polyurethane, such as polyether thermoplastic polyurethane and the like.

[0020] Specifically, the mixed liquid also contains a dye, which may be blue, yellow, etc., to attract pests.

[0021] Preferably, the mass ratio of (b) to (a) is 1-50: 1. Further preferably, the mass ratio of (b) to (a) is 20-40: 1. More preferably, the mass ratio of (b) to (a) is 25-35: 1.

[0022] Specifically, the insect repellent or insecticidal active ingredient is selected from one or more of insect pheromone-based insect repellent or insecticidal active ingredients, contact pesticides, and plant essential oil-based insect repellent or insecticidal active ingredients.

[0023] Specifically, the contact pesticide is selected from one or more of pyrethroid pesticides, volatile organophosphorus pesticides, horseradish, spinetoram, emamectin benzoate, and cyantraniliprole.

[0024] Specifically, the insect pheromone-based insect repellent or insecticidal active ingredients can be insect pheromone-based insect repellent or insecticidal active ingredients conventionally used in the art, including but not limited to lavender acetate, thrips aggregation pheromone, (10E, 12Z)-16:OH, (7Z, 11Z)-16:OAc(b), etc.

[0025] Specifically, the pyrethroid pesticides may be pyrethroid pesticides conventionally used in the art, including but not limited to ethomethrin, permethrin, deltamethrin, cypermethrin, beta-cypermethrin, cis-cypermethrin, and the like.

[0026] Specifically, the volatile organophosphorus pesticides may be volatile organophosphorus pesticides conventionally used in the art, including but not limited to dichlorvos, quinalphos, and fenthion.

[0027] Preferably, the anthelmintic or insecticidal active ingredient is one or more of horseradish and deltamethrin. Preferably, the anthelmintic or insecticidal active ingredient is a combination of horseradish and deltamethrin, and the mass ratio of horseradish to deltamethrin is 1:1-10; more preferably, the mass ratio of horseradish to deltamethrin is 1:2-5.

[0028] Preferably, the spinning process can be dry spinning or wet spinning.

[0029] Specifically, in some embodiments, when (b) is selected from polyurethane, polycaprolactone or polyvinyl alcohol, the long-lasting insect repellent net is prepared by a wet spinning process, comprising the following preparation steps:

[0030] (1) preparing a mixture of polyurethane, polycaprolactone or polyvinyl alcohol and an insect repellent or insecticidal active ingredient;

[0031] (2) The mixed dispersion in step (1) is spun into a fiber through a wet spinning process, woven, and dried to obtain the long-lasting insect repellent net.

[0032] Specifically, in step (1), the mixed solution contains a ketone solvent, such as N-methylpyrrolidone, acetone, etc.

[0033] Specifically, in step (2), the wet spinning process includes the steps of: coagulation in a coagulation bath, a first stretching, coagulation in a coagulation bath, and a second stretching.

[0034] Specifically, the coagulation temperature of the coagulation bath is 35-50°C.

[0035] Specifically, when (b) is selected from polyurethane or polycaprolactone, the temperature of the first stretching is 75-85°C, and the stretching ratio is 3-5:1; the temperature of the second stretching is 65-75°C, and the stretching ratio is 3-5:1.

[0036] Specifically, when (b) is selected from polyvinyl alcohol, the temperature of the first stretching is 40-50°C, and the stretching ratio is 2-4:1; the temperature of the second stretching is 45-55°C, and the stretching ratio is 2-4:1.

[0037] Specifically, in some embodiments, when (b) is selected from nylon or polyethylene, the long-lasting insect repellent net is prepared by a dry spinning process, comprising the following preparation steps:

[0038] (1) preparing a mixture of nylon or polyethylene and an insect repellent or insecticidal active ingredient;

[0039] (2) The mixed solution of step (1) is spun into a fiber through a dry spinning process, and then woven to obtain the long-lasting insect repellent net.

[0040] Specifically, in step (1), the mixed solution contains a ketone solvent, such as N-methylpyrrolidone, acetone, etc.

[0041] Specifically, in step (2), the dry spinning process includes the steps of heating to a molten state, stretching, and shaping.

[0042] Specifically, the temperature for heating to the molten state is 240-260°C. Specifically, the stretching is performed at 130-160°C. Specifically, the shaping is performed at 160-200°C.

[0043] Preferably, the insect repellent or insecticidal active ingredient is loaded with a slow-release material.

[0044] Further preferably, the sustained-release material is selected from one or more of nano-SiO2, metal organic framework materials, graphene, and SiO2 aerogel microcapsules.

[0045] Specifically, in some embodiments, when SiO2 aerogel microcapsules are used to load the anthelmintic or insecticidal active ingredients, the preparation method is as follows: under vacuum conditions, SiO2 aerogel particles and the anthelmintic or insecticidal active ingredients are mixed, and the mixture is mixed at 50-80°C so that the anthelmintic or insecticidal active ingredients can fully penetrate into the aerogel particles, centrifuged, washed, and the precipitate is collected to obtain the anthelmintic or insecticidal active ingredients loaded on the SiO2 aerogel microcapsules.

[0046] Specifically, in some embodiments, when graphene or nano-SiO2 is used to load insect repellent or insecticidal active ingredients, the physical adsorption method conventionally used in the art can be used for preparation.

[0047] Specifically, in some embodiments, when a metal-organic framework material is used to load an insect repellent or insecticidal active ingredient, the preparation method is as follows: prepare a precursor solution of the metal-organic framework material, and then mix the precursor solution and the insect repellent or insecticidal active ingredient to prepare the insect repellent or insecticidal active ingredient loaded by the metal-organic framework material.

[0048] More specifically, the precursor solution of the metal organic framework material includes the following preparation steps: mixing zinc nitrate, a solvent and 2-methylimidazole for reaction, centrifuging and washing to obtain the precursor solution of the metal organic framework material.

[0049] Furthermore, the present invention seeks to protect the long-acting insect repellent net prepared by the above preparation method.

[0050] Furthermore, the present invention seeks to protect the use of the above-mentioned long-acting insect repellent net in repelling insects of vine or creeper crops.

[0051] Furthermore, the present invention claims protection for an insect repellent or insecticidal method, using the above-mentioned long-acting insect repellent net or a pipe long-acting insect repellent net with a pipe inside to hang vines or creepers;

[0052] The pipeline of the pipeline long-acting insect repellent net is connected with a drug delivery device for delivering insect repellent or insecticidal active ingredients to the pipeline long-acting insect repellent net.

[0053] Specifically, the vine-growing or climbing crops include but are not limited to cowpea, grape, cucumber, bitter gourd, etc.

[0054] Specifically, the material of the pipeline long-lasting insect repellent net is SiO 2、 Long-term insect repellent nets for pipelines made of polymer materials such as tetrafluoroethylene (PTFE), polyvinyl chloride (PVC), thermoplastic polyurethane (TPU), and polyacrylonitrile fiber (PAN). The long-term insect repellent nets for pipelines provided by the present invention are connected to a suitable drug delivery device, so that the insect repellent or insecticide active ingredients can be intelligently applied, and at the same time, they are slowly released outward through the molecular pores of the polymer material in the pipeline, so as to achieve the goal of long-term and lasting control of pests and diseases.

[0055] Specifically, the diameter of the pipe is 1-10 mm. Further preferably, the diameter of the pipe is 2-4 mm.

[0056] Specifically, the drug delivery device may be an infusion bottle or a field drip irrigation device.

[0057] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The present invention provides a long-acting insect repellent net with excellent long-term prevention and control effect, which can be matched with different active ingredient formulas to cope with different pests on different crops. While providing crops with vine extension, it achieves the effect of precise pesticide application, reduces spray application, labor costs and drug costs, controls the insect population base within a low range for a long time, and greatly reduces pesticide residues. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a test on the control of cowpea thrips by the insect repellent nets prepared in the examples and comparative examples.

[0061] Figure 2 Experiment on the control of bitter melon fruit flies using pipeline insect repellent nets.

[0062] Figure 3 This is a test on the control of tomato leaf miner by using the PVA long-acting insect repellent net prepared in Example 5.

[0063] Figure 4 This is a sustained release performance test of different sustained release carriers prepared in Example 6. DETAILED DESCRIPTION

[0064] The present invention is further described below in conjunction with the specification and specific examples, but the examples do not limit the present invention in any form. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0065] Example 1 Thermoplastic polyurethane long-lasting insect repellent net

[0066] In this embodiment, a method for preparing a long-lasting insect repellent net using thermoplastic polyurethane as a base material is provided, comprising the following steps:

[0067] (1) Material preparation: polyether thermoplastic polyurethane is selected, and the insect repellent active ingredient is horseradish root combined with deltamethrin, with a mass ratio of 1:3, and the insect repellent active ingredient accounting for 30% by mass of the polyether thermoplastic polyurethane is added to every 100 grams of polyether thermoplastic polyurethane.

[0068] (2) Dissolving polyurethane: dissolving 100 g of polyether thermoplastic polyurethane in solvent N-methylpyrrolidone (NMP) at a dissolving temperature of 90° C., a stirring rate of 300 rpm, and a stirring time of 4 h until the thermoplastic polyurethane is completely dissolved to form a uniform solution.

[0069] (3) Adding an insect repellent active ingredient: Add a predetermined amount of the insect repellent active ingredient to the solution of step (2), stir the mixed solution, maintain the temperature at 90° C., and stir at a rate of 500 rpm for 2 h to ensure that the insect repellent active ingredient is evenly dispersed to obtain a mixed solution.

[0070] (4) Spinning: The mixed solution of step (3) is fed into a wet spinning device through a spinneret. After the solution is ejected, it immediately enters a coagulation bath. The coagulation bath temperature is controlled at 45°C. The fiber is stretched in a saturated sodium sulfate solution. The first drafting roller is wet-heat stretched (80°C), then immersed in a coagulation bath, and the second drafting roller is dry-heat stretched (70°C) to an appropriate length. The stretching ratio is 4:1. After two stretchings, the fiber reaches the expected mechanical strength.

[0071] (5) Weaving and drying: The spun fibers are woven into a mesh structure, and the mesh size can be adjusted as needed. The mesh is dried at 50° C. for 8 hours until the residual solvent and moisture are completely removed, thereby preparing a thermoplastic polyurethane long-lasting insect repellent net (labeled as thermoplastic polyurethane 1).

[0072] Example 2 Polycaprolactone long-acting insect repellent net

[0073] In this embodiment, a long-lasting insect repellent net is provided using polycaprolactone as a base material, which is prepared by referring to Example 1 (labeled as polycaprolactone 1).

[0074] Example 3 Nylon long-lasting insect repellent net

[0075] In this embodiment, a method for preparing a long-lasting insect repellent net using nylon as a base material is provided, comprising the following steps:

[0076] 200 catties of nylon slices, 30% horseradish combined with deltamethrin (mass ratio of 1:3) and acetone solution were mixed, and the mixed sample was added to the spinning machine, heated to about 250°C to melt it to form a spinning solution, and the impurities and gel in it were filtered out, and the spinning solution was quantitatively delivered to the spinneret. After the spinning solution was extruded from the capillary pores of the spinneret to form a thin stream, the thin stream was stretched at 150°C with the help of a stretching device to orient the molecular chains, thereby improving the strength and elasticity of the fiber. After the stretching is completed, the fiber is passed through a heat setting device and heat set at a temperature of 180°C. Finally, after twisting and weaving, a nylon long-lasting insect repellent net (marked as nylon 1) is prepared.

[0077] Example 4 Polyethylene long-acting insect repellent net

[0078] In this embodiment, a long-lasting insect repellent net is prepared using polyethylene as a base material. The preparation method is referred to Example 3, except that: the polyethylene long-lasting insect repellent net is heated to 130°C to melt it, and the stretching temperature is 150°C to prepare the polyethylene long-lasting insect repellent net (marked as polyethylene 1).

[0079] Example 5 Polyvinyl alcohol long-acting insect repellent net containing horseradish

[0080] The production process of polyvinyl alcohol long-lasting insect repellent net is as follows: 200 catties of polyvinyl alcohol is dissolved in 95°C deionized water to prepare a polyvinyl alcohol solution with a mass fraction of 16%, and then 30% of horseradish per mass relative to the polyvinyl alcohol solution is added. The blended solution is stirred and dispersed at 1000 rpm for 5 hours, and then allowed to stand at room temperature for 12 hours to obtain a blended spinning solution. The above blended spinning solution is sent to a wet spinning device, and polyvinyl alcohol fiber is prepared through the following steps:

[0081] (1) Coagulation bath: The blended spinning solution is sent into a coagulation bath (saturated sodium sulfate solution) at a temperature of 45°C. At this temperature, the fibers are gradually solidified to form a preliminary structure.

[0082] (2) First stretching: stretching temperature 45°C, consistent with the coagulation bath temperature; stretching ratio 3:1 (i.e., the original fiber length is stretched to 3 times); stretching speed 10 m / min.

[0083] (3) Re-immersion in coagulation bath: The stretched fiber enters the coagulation bath (saturated sodium sulfate solution) at 45°C again to further solidify and stabilize the fiber structure. The immersion time is 5 min.

[0084] (4) Second stretching: stretching temperature 50°C; stretching ratio 2:1 (i.e., the fiber length after the first stretching is stretched to twice the original length); stretching speed 8 m / min.

[0085] (5) Drying: The stretched polyvinyl alcohol fibers were dried in a hot air dryer at 50° C. for 8 hours and woven into a mesh structure to prepare a polyvinyl alcohol long-lasting insect repellent net.

[0086] Example 6: Sustained-release material loaded with insect repellent or insecticidal active ingredients

[0087] This example selects horseradish from a variety of active ingredients as an example to prepare a sustained-release active ingredient.

[0088] (1) Preparation of SiO2 aerogel microcapsule active ingredients: 100g SiO2 aerogel particles were placed in a two-necked flask with a cork stopper, and the vacuum was evacuated until the vacuum degree in the bottle reached -0.1MPa. Then 600ml of horseradish was injected into the bottle from the other bottle mouth until it completely covered the aerogel particles. Then, the flask was placed in a vacuum oven (vacuum degree -0.1MPa) at 70°C for 6h to allow the horseradish to fully penetrate into the aerogel particles. After that, the flask was taken out, and deionized water was added to the bottle under normal pressure. The flask was stirred magnetically for 10min, and then the excess horseradish was removed by centrifugation. The washing / centrifugation procedure was repeated several times until the supernatant was transparent, and the precipitate was collected and dried naturally to obtain SiO2 insect repellent and insecticidal aerosol microcapsules.

[0089] (2) Graphene loaded with active ingredients: 100 g of graphene was dispersed in methanol to form a uniform graphene dispersion. Then 600 ml of horseradish was dissolved in methanol, and the horseradish solution was slowly added to the graphene dispersion. Stirring was performed for 12 hours to allow the horseradish to fully contact the graphene. Finally, the graphene loaded with horseradish was collected by centrifugation and filtration. After drying, the finished horseradish loaded graphene was obtained.

[0090] (3) Nano-SiO2 loading of active ingredients: The physical adsorption method is also used, and the method refers to the method of loading active ingredients on graphene.

[0091] (4) MOF (ZIF-8) loaded with active ingredients:

[0092] 1) Preparation of ZIF-8 precursor solution: Dissolve 0.4 g Zn(NO3)2·6H2O in 10 mL methanol-water (methanol: water = 1:1) solution. Weigh 4 g 2-methylimidazole and dissolve it in 20 mL methanol-water (methanol: water = 1:1) solution. Add 20 mL of 2-methylimidazole solution to the Zn(NO3)2·6H2O solution at a drop rate of 1 ml per minute and stir for 15 minutes. Centrifuge and wash: Collect the product by centrifugation and wash with methanol at least 3 times to remove unreacted substances.

[0093] 2) Drug loading process:

[0094] Dissolving drug-carrying ingredients: Prepare drug-carrying solution according to the required active ingredient. The following are the dissolution processes of two different active ingredients:

[0095] Horseradish: Weigh 0.2 g of horseradish, dissolve it in 10 mL of methanol (containing 4 g of 2-methylimidazole), add 10 mL of water, and shake to mix.

[0096] Drug loading and loading: 20 mL of 2-methylimidazole methanol aqueous solution was added to the prepared Zn(NO3)2·6H2O solution at a drop rate of 1 ml per minute and stirred for 15 minutes. The product was collected by centrifugation and washed with methanol to remove excess solvent or unreacted substances.

[0097] Comparative Example 1 Preparation of Thermoplastic Polyurethane Insect Repellent Net by Immersion Method

[0098] In this comparative example, a thermoplastic polyurethane insect repellent net is prepared by an immersion method, comprising the following steps:

[0099] (1) Preparation of thermoplastic polyurethane net: The preparation method of the thermoplastic polyurethane net body in Example 1 is referred to, but no insect repellent active ingredient is added during the preparation process.

[0100] (2) Active ingredient loading by immersion method: horseradish root combined with deltamethrin is selected as the insect repellent active ingredient (the mass fraction of the insect repellent active ingredient in the thermoplastic polyurethane mesh body in step (1) is 30%), the mass ratio of horseradish root to deltamethrin is 1:3, and they are dissolved in acetone solvent. The thermoplastic polyurethane mesh body prepared in step (1) is immersed in the above acetone solution containing the insect repellent active ingredient to ensure that the surface is completely soaked. The immersion time is 12 hours to ensure that the active ingredient fully penetrates into the fibers of the mesh. The mesh material after immersion is taken out and placed in a cool place to dry in the shade to prepare a thermoplastic polyurethane insect repellent mesh (labeled as thermoplastic polyurethane 2).

[0101] Comparative Example 2 Preparation of polycaprolactone insect repellent net by immersion method

[0102] In this comparative example, a polycaprolactone insect repellent net prepared by immersion method is provided. The polycaprolactone net main body is prepared by referring to the preparation method in Example 2, and then the polycaprolactone insect repellent net (labeled as polycaprolactone 2) is prepared according to the preparation method in Comparative Example 1.

[0103] Comparative Example 3 Hemp Rope Insect Repellent Net

[0104] In this comparative example, a method for preparing an insect repellent net using hemp rope as a base material is provided. The hemp rope is immersed in a solution of horseradish combined with cypermethrin (mass ratio is 1:3) accounting for 30% of the mass fraction of the hemp rope, the mass ratio of the hemp rope to the solution is 10:3, and the net is sealed with tin foil for at least 12 hours to prepare a hemp rope insect repellent net.

[0105] Comparative Example 4: Cotton Rope Insect Repellent Net

[0106] The difference between this comparative example and comparative example 3 is that the hemp rope is replaced by a cotton rope.

[0107] Comparative Example 5 Preparation of Nylon Insect Repellent Net by Immersion Method

[0108] This comparative example provides a method for preparing a nylon insect repellent net by an immersion method, which comprises the following steps:

[0109] (1) The preparation method of Example 3 was used, but horseradish and deltamethrin were not added during the preparation process to prepare a nylon net body without insect repellent active ingredients;

[0110] (2) Horseradish extract and deltamethrin are selected as the anthelmintic active ingredients in a mass ratio of 1:3, and dissolved in an acetone solvent. The nylon mesh body prepared in step (1) is immersed in the above acetone solution containing the anthelmintic active ingredients (the mass fraction of the anthelmintic active ingredients in the nylon mesh body in step (1) is 30%) to ensure that the surface is completely soaked. The soaking time is 12 hours to ensure that the active ingredients fully penetrate into the fibers of the mesh. The mesh material after soaking is taken out and placed in a cool place to dry in the shade to prepare a nylon anthelmintic net (labeled as nylon 2).

[0111] Comparative Example 6 Preparation of Polyethylene Insect Repellent Net by Immersion Method

[0112] This comparative example provides a method for preparing a polyethylene insect repellent net by an immersion method. The method comprises the following steps:

[0113] (1) The preparation method of Example 4 was used, but horseradish and deltamethrin were not added during the preparation process to prepare a polyethylene net body without insect repellent active ingredients;

[0114] (2) A polyethylene insect repellent net (labeled as polyethylene 2) was prepared by referring to the preparation method of Comparative Example 5.

[0115] Test Example 1

[0116] In the cowpea field of Leizhou City, Guangdong Province, the insect repellent nets prepared by Examples 1-2, Examples 3-4, and Comparative Examples 1-6 were tested for the control of cowpea thrips. The insect repellent net was hung at the beginning of the cowpea vine extension period, and the insect repellent net was hung in an area of ​​12m long in each ridge. Each treatment was repeated three times, and each repetition was selected on a different ridge. The occurrence of thrips was investigated at 1d, 3d, 5d, 7d, 9d, 11d, 13d, 15d, 17d, 19d, 21d, 23d, 25d, 27d, 29d, and 31d after the net was hung, and the control effect was calculated by the following formula:

[0117]

[0118] Figure 1The insect repellent nets prepared in the examples and comparative examples were tested for controlling cowpea thrips. Figure 1 As shown, the long-acting insect repellent net prepared by the embodiment can control the insect population of cowpea thrips for a long time, and can ensure 100% control effect from the time the insect repellent net is hung until the 13th day.

[0119] Among them, the control effect of the nylon insect repellent net and the polyethylene insect repellent net prepared in Examples 3 and 4 decreased rapidly after 15 days, while the polycaprolactone insect repellent net and the thermoplastic polyurethane insect repellent net prepared in Examples 1 and 2 had a better control effect. In particular, the control effect of the polycaprolactone insect repellent net was still close to 50% on the 31st day. Test Example 2 Balsam pear fruit fly control test of pipeline insect repellent net

[0120] (1) Preparation of pipeline insect repellent net

[0121] 500 kilograms of 2mm-diameter tetrafluoroethylene (PTEF) pipes were selected and sent into a weaving machine to weave a tetrafluoroethylene pipe insect repellent net.

[0122] (2) The tetrafluoroethylene pipeline insect repellent net prepared above was tested in Pengjiang District, Jiangmen City, Guangdong Province to control bitter melon fruit flies. A disposable infusion device was connected to the opening of the pipeline net. When in use, dichlorvos was put into the infusion bottle, and the drug was filled into the pipeline of the pipeline insect repellent net by opening the infusion valve. The insect repellent net was hung at the beginning of the bitter melon extension period, and an area of ​​10m long was selected in each ridge to hang the insect repellent net. Each treatment was repeated three times, and each repetition was selected on a different ridge. The occurrence of melon fruit flies was investigated 1d, 3d, 5d, 7d, 9d, 11d, 13d, 15d, 17d, 19d, 21d, 23d, 25d, 27d, 29d, and 31d after the net was hung. The calculation method of the control effect was the same as that of Test Example 1, wherein the agent was supplemented in time after it was found that the control effect was less than 70%.

[0123] Figure 2 This is a test on the control of bitter melon fruit flies using pipeline insect repellent nets. Figure 2 As shown, through timely prevention effectiveness investigation and pesticide supplementation, the control effect of the tetrafluoroethylene pipe insect repellent net on bitter melon fruit flies has been maintained at more than 60%, achieving the purpose of long-term control.

[0124] Test Example 3: Test on the control of tomato leafminers using long-lasting insect repellent nets

[0125] The polyvinyl alcohol long-acting insect repellent net containing horseradish prepared in Example 5 was tested in Huadu District, Guangzhou City, Guangdong Province, for the control of tomato leafminers. The insect repellent net was selected to be hung at the beginning of the tomato vine extension period, and the insect repellent net was selected in a 20m long area on each ridge. Each treatment was repeated three times, and each repetition was selected on a different ridge. The occurrence of melon and tomato leafminers was investigated 1d, 3d, 5d, 7d, 9d, 11d, 13d, 15d, 17d, 19d, 21d, 23d, 25d, 27d, 29d, and 31d after the net was hung. The calculation method of the control effect was the same as that of Test Example 1.

[0126] Figure 3 This is a test on the control of tomato leafminer by the polyvinyl alcohol long-lasting insect repellent net prepared in Example 5. Figure 3 As shown, the use of polyvinyl alcohol long-lasting insect repellent net can control the insect population of tomato leaf miner for a longer period of time. From the beginning of hanging the insect repellent net, 100% control effect can be guaranteed in the first 15 days. On the 27th day, more than 50% control effect can be guaranteed. By the 31st day, more than 20% control effect is still achieved.

[0127] Test Example 4 Sustained Release Performance Test of Different Sustained Release Carriers

[0128] The four sustained-release components of horseradish extract prepared in Example 6 were weighed according to the horseradish extract effective ingredient content of 5 g, and the corresponding mass of sustained-release active ingredients was placed in a 9 cm culture dish. The culture dish was then placed in a fume hood and naturally evaporated at room temperature. The changes in mass of each treatment were measured on the 7th, 15th and 31st days, and the drug release amount was calculated. Each treatment was repeated three times.

[0129] Figure 4 The sustained release performance test of different sustained release carriers prepared in Example 6. Figure 4 As shown, MOF, graphene, nano-silica and aerogel microcapsules all have the effect of sustained-release of horseradish, among which MOF and aerogel microcapsules have the most significant effect on improving its sustained-release properties.

[0130] The foregoing examples are merely illustrative and are used to explain some features of the method of the present invention. The appended claims are intended to require the widest possible range that can be imagined, and the embodiments presented herein are demonstrated by the applicant's actual test results. Therefore, the applicant's intention is that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Some numerical ranges used in the claims also include sub-ranges therein, and changes in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A method for preparing a long-lasting insect repellent net, characterized in that: The method comprises the steps of spinning the mixed solution into a fiber and weaving the mixed solution into a mesh; The mixed solution comprises: (a) anthelmintic or insecticidal active ingredients; (b) one or more selected from polyurethane, polycaprolactone, nylon, polyethylene, polyvinyl alcohol, and polyacrylonitrile.

2. The preparation method according to claim 1, characterized in that: The mass ratio of (b) to (a) is 1-50:

1.

3. The preparation method according to claim 1, characterized in that: The insect repellent or insecticidal active ingredient is selected from one or more of insect pheromone insect repellent or insecticidal active ingredients, contact pesticides, and plant essential oil insect repellent or insecticidal active ingredients.

4. The preparation method according to claim 3, characterized in that: The contact pesticide is selected from one or more of pyrethroid pesticides, volatile organophosphorus pesticides, horseradish, spinetoram, emamectin benzoate, and cyantraniliprole.

5. The preparation method according to claim 4, characterized in that: The anthelmintic or insecticidal active ingredients are one or more of horseradish and deltamethrin.

6. The preparation method according to claim 1, characterized in that: The spinning process is wet spinning or dry spinning.

7. The preparation method according to claim 1, characterized in that: The insect repellent or insecticide active ingredient is loaded with a slow-release material; the slow-release material is selected from one or more of nano-SiO2, metal organic framework materials, graphene, and SiO2 aerogel microcapsules.

8. The long-acting insect repellent net prepared by the preparation method according to any one of claims 1 to 7.

9. Use of the long-acting insect repellent net according to claim 8 in repelling insects of creeping or climbing crops.

10. A method for repelling or killing insects, characterized in that: Using the long-acting insect repellent net as claimed in claim 8 or using a long-acting insect repellent net with a pipe inside to hang creeping or climbing crops; The pipeline of the pipeline long-acting insect repellent net is connected with a drug delivery device for delivering insect repellent or insecticidal active ingredients to the pipeline long-acting insect repellent net.

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