Solenopsis invicta repellent aerogel as well as preparation method and application thereof

Abstract

The invention discloses solenopsis invicta repellent aerogel as well as a preparation method and application thereof, and belongs to the technical field of comprehensive utilization of natural polymer materials and agriculture and forestry biomass resources. The preparation method specifically comprises the following steps: (1) mixing tannic acid powder with water, and stirring; (2) mixing with a solenopsis invicta repellent emulsion, and dispersing; and (3) freezing and freeze-drying. The solenopsis invicta repellent aerogel based on the wood nanocellulose and the tannic acid is prepared by adding novel biological materials and introducing a vacuum freeze-drying technology through a large amount of process exploration, and the aerogel is relatively high in fixing capacity for effective components, low in extraction rate of the effective components and less in leakage phenomenon after long-term storage. A laboratory test shows that the red imported fire ant nesting behavior can be completely inhibited within 30 days when the red imported fire ant nesting agent is placed in a nesting container.

Description

Technical Field

[0001] This invention relates to the field of natural polymer materials and comprehensive utilization of agricultural and forestry biomass resources, and more specifically to a red imported fire ant repellent aerogel, its preparation method and application. Background Technology

[0002] Red imported fire ants (Solenopsis invicta) are important invasive pests that pose a serious threat to agriculture, forestry, public safety, and the ecological environment. In areas infested by red imported fire ants, they often damage various electrical facilities and power cables, and such facilities in forestry land are at high risk of damage (Du Chengju, Wang Lei, Lu Yongyue, et al. Research progress on the occurrence characteristics and monitoring and control of red imported fire ants in forest and grassland wetlands and urban green spaces [J]. Acta Entomologica Sinica, 2023, 66(08):1128-1138.DOI:10.16380 / j.kcxb.2023.08.013.). Gutrich et al. (2007) reported that power and communications companies in Hawaii, USA, spend more than $10 million annually on equipment replacement or maintenance to cope with the damage caused by red imported fire ants (Gutrich JJ, Van Gelder E, Loope L, 2007. Potential economic impact of introduction and spread of the red imported fire ant, Solenopsis invicta, in Hawaii. Environ. Sci. Policy, 10(7-8):685-696.).

[0003] To reduce such losses, the main approach is to spray insecticides on equipment surfaces or conduct large-scale red imported fire ant control in the equipment area. However, existing spray formulations have low persistence, and large-scale control is too costly. Therefore, using long-acting, slow-release repellents is considered a more environmentally friendly and durable method. Similar to the application of mothballs, placing items that can release repellent gases over a long period in advance in containers of facilities where red imported fire ants are prone to infestation can effectively prevent red imported fire ants from invading and nesting.

[0004] However, there are currently no such products available globally for red imported fire ants.

[0005] Therefore, how to develop a long-term slow-release repellent for red imported fire ants is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a red imported fire ant repellent aerogel, its preparation method and application, which is an aerogel based on the synergistic construction of lignocellulosic nanocellulose and plant tannins to carry volatile repellent active ingredients, and can be applied to the long-term repellency and protection against the major invasive pest red imported fire ants.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for preparing a red imported fire ant repellent aerogel includes the following steps:

[0009] (1) Mix tannic acid powder with water and stir to obtain tannic acid suspension;

[0010] (2) Mix the tannic acid suspension with the red imported fire ant repellent emulsion and disperse to obtain an emulsion-tannic acid suspension mixture;

[0011] (3) The emulsion-tannic acid suspension mixture was frozen and freeze-dried in sequence to obtain red fire ant repellent aerogel.

[0012] Furthermore, in step (1) above, the concentration of the tannic acid suspension is 10wt% to 30wt%, preferably 10wt%, 20wt% or 30wt%.

[0013] The further beneficial effect of the above-mentioned method is that tannic acid is a hydrolyzable tannin with good water solubility, containing abundant phenolic hydroxyl groups, which can form stable interactions with water molecules through hydrogen bonds. Simultaneously, its molecule also contains multiple aromatic ring structures, enabling hydrophobic interactions with nonpolar isoeugenol methyl ether.

[0014] Furthermore, in step (1) above, the stirring device is a magnetic stirrer with a speed of 1000 rpm and a time of 72 hours.

[0015] Furthermore, in step (2) above, the preparation method of the red imported fire ant repellent emulsion specifically includes the following steps:

[0016] 1) Preparation and pretreatment of organic complex acids:

[0017] 11) Prepare a mixed acid solution by mixing citric acid and maleic acid, and heat and stir until completely dissolved;

[0018] 12) Continue heating the mixed acid solution to a certain temperature, add poplar wood powder, and stir to react;

[0019] 13) After the reaction is complete, filter the solid residue, wash it off, dry it under vacuum, collect it, and place it in a desiccator.

[0020] 2) Mechanical nanofibrillation treatment:

[0021] 21) The dried solid residue was added to deionized water to prepare a suspension, stirred, and homogenized multiple times by step pressure increase to obtain lignocellulose nanoparticles.

[0022] 22) Mix isoeugenol methyl ether with lignocellulose nanofiber at a mass ratio of 1:9 to 9:1 and stir to prepare red imported fire ant repellent emulsion (isoeugenol methyl ether lignocellulose nanofiber emulsion).

[0023] The further beneficial effect of the above-mentioned method is that the present invention combines isoeugenol methyl ether with lignocellulose through nanotechnology, which effectively improves the sustained release, antioxidant, photodegradation resistance and heat resistance of isoeugenol methyl ether.

[0024] Furthermore, in step 11) above, the mass ratio of citric acid to maleic acid is 3:7 to 7:3; the concentration of the mixed acid solution is 80 wt%.

[0025] Step 12) The solid-liquid mass ratio of poplar powder to mixed acid solution is 1:10; the poplar powder is 60-80 mesh and is dried poplar powder dried at 105℃ for 24 hours; continue to heat to 120℃ and stir the reaction for 180 minutes.

[0026] In steps 11) and 12), the stirring speed is 1000 rpm.

[0027] Step 13) Vacuum drying conditions: 60℃, drying for 24 hours;

[0028] Step 21) Stepwise pressure increase and multiple homogenization: Homogenize twice at 3.5 MPa, then three times at 30 MPa, and finally 12 times at 100 MPa; the content of solid residue in the suspension is 0.1 wt% to 0.5 wt%; the stirring speed is 500 rpm and the time is 12 h.

[0029] Step 22) Stir at 7000 rpm for 1 hour.

[0030] The further beneficial effects of the above-mentioned methods are that organic composite acid pretreatment can effectively hydrolyze poplar powder, weaken the interlayer bonding force between fibers, and reduce the degree of fiber polymerization and diameter; introducing carboxyl groups into the fiber surface increases the electrostatic repulsion between fibers, which can improve the dispersion stability of fibers in water. Stepped pressurization and multiple homogenization can prevent large-diameter fibers from clogging the machine.

[0031] Furthermore, in step (2) above, the mass ratio of tannic acid suspension to red imported fire ant repellent emulsion is 1:9 to 3:7, preferably 1:9, 2:8 or 3:7.

[0032] A further beneficial effect of the above-mentioned method is that the ratio of tannic acid suspension to red imported fire ant repellent emulsion is one of the core optimization parameters of this invention. By controlling the amount of tannic acid suspension added, the fixation effect of isoeugenol methyl ether and the performance of the final aerogel can be optimized.

[0033] Furthermore, in step (2) above, the dispersing equipment is a high-speed disperser with a rotation speed of 10,000 rpm and a time of 15 min.

[0034] Furthermore, in step (3) above, the freezing equipment is a refrigerator, the temperature is -80℃, and the time is 24h; the freeze-drying equipment is a vacuum freeze dryer, and the time is 16h.

[0035] The present invention also claims protection for a red imported fire ant repellent aerogel prepared by the above preparation method.

[0036] The present invention also claims protection for the application of a red imported fire ant repellent aerogel prepared by the above preparation method in repelling red imported fire ants.

[0037] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. Highly efficient sustained release: Stable drug loading and slow release rate, enabling long-term repellency for ≥30 days;

[0039] 2. Green and safe: All raw materials are derived from renewable biomass, and the process contains no organic solvents or heavy metal residues;

[0040] 3. Simple and scalable process: Mass production can be achieved through "magnetic stirring + high-speed dispersion + conventional freeze drying", and the equipment is highly versatile.

[0041] In summary, this invention, through the addition of novel biomaterials and the introduction of vacuum freeze-drying technology, and after extensive process exploration, has prepared a red imported fire ant repellent aerogel based on lignocellulose nanofibers and tannic acid. This aerogel exhibits strong fixation ability for the active ingredients, low loss rate of active ingredients, and minimal leakage during long-term storage. Laboratory tests have shown that placing it in a nesting container can completely inhibit nesting behavior of red imported fire ants within 30 days. Attached Figure Description

[0042] Figure 1 The process flow diagrams are shown for the preparation methods of red imported fire ant repellent aerogels in Examples 1-9;

[0043] Figure 2 The percentage of aerogel leakage to the initial weight of the aerogel for different test days;

[0044] Figure 3 The weight of red imported fire ant colonies in the apparatus with different aerogel formulations and the control treatment at 30 days of the experiment. Detailed Implementation

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the following embodiments, the preparation method of the red imported fire ant repellent emulsion specifically includes the following steps:

[0047] 1) Organic complex acid pretreatment:

[0048] 11) Weigh citric acid (CA) and maleic acid (MA) in a mass ratio of 3:7, add deionized water to prepare a mixed acid solution with a concentration of 80wt%, heat and stir at a stirring speed of 1000rpm.

[0049] 12) Dissolve the mixed acid solution completely into a transparent solution, continue to heat to 120℃, quickly add poplar wood powder, stir at 1000 rpm, and react for 180 min;

[0050] The solid-liquid mass ratio of poplar wood powder to the mixed acid solution is 1:10;

[0051] Poplar wood powder is 60-80 mesh; poplar wood powder is dried poplar wood powder dried at 105℃ for 24 hours.

[0052] 13) After the reaction is complete, filter immediately and continuously add anhydrous ethanol to wash the solid residue until the dripping filtrate becomes a transparent solution; add deionized water to the obtained solid residue and stir well, centrifuge at 1000 rpm / min for 5 min, discard the supernatant, add deionized water again and stir well, and repeat centrifugation and washing 5 times; dry the solid residue in vacuum at 60℃ for 24 h; finally collect it in a sealed bag and place it in a desiccator.

[0053] 2) Mechanical nanofibrillation treatment:

[0054] 21) Add the dried solid residue to deionized water to prepare a 0.5 wt% suspension, stir for 12 h, homogenize twice at 3.5 MPa pressure using a high-pressure homogenizer, then homogenize three times at 30 MPa pressure, and finally homogenize 12 times at 100 MPa pressure to obtain lignocellulose nanofibers.

[0055] 22) Mix 20g of isoeugenol methyl ether with 180g of 0.5wt% wood nanocellulose at a mass ratio of 1:9 and stir for 1 hour to obtain a red imported fire ant repellent emulsion.

[0056] The emulsion can be directly freeze-dried under vacuum to form a stable solid structure with dense internal pores, and the repellency effect can be initially tested up to 10 days. However, the aerogel has a weak ability to fix the active ingredients, specifically with a high loss rate: the active ingredients are prone to volatilization / sublimation during the freeze-drying process, with a loss rate of 50%-70%; and a high leakage rate: a large amount of leakage was observed after 3 days of storage at room temperature, which greatly reduces the actual effective time, possibly far less than 10 days.

[0057] Example 1

[0058] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0059] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 10 wt%.

[0060] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 1:9 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0061] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0062] Example 2

[0063] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0064] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 10 wt%.

[0065] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 2:8 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0066] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0067] Example 3

[0068] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0069] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 10 wt%.

[0070] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 3:7 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0071] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0072] Example 4

[0073] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0074] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 20 wt%.

[0075] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 1:9 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0076] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0077] Example 5

[0078] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0079] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 20 wt%.

[0080] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 2:8 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0081] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0082] Example 6

[0083] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0084] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 20 wt%.

[0085] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 3:7 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0086] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0087] Example 7

[0088] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0089] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 30 wt%.

[0090] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 1:9 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0091] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0092] Example 8

[0093] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0094] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 30 wt%.

[0095] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 2:8 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0096] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0097] Example 9

[0098] The preparation method of red imported fire ant repellent aerogel specifically includes the following steps:

[0099] (1) Mix tannic acid powder with water and stir with a magnetic stirrer at 1000 rpm for 72 h to obtain a tannic acid suspension with a concentration of 30 wt%.

[0100] (2) The tannic acid suspension and the red imported fire ant repellent emulsion were mixed at a mass ratio of 3:7 and dispersed at a speed of 10,000 rpm for 15 minutes using a high-speed disperser to obtain the emulsion-tannic acid suspension mixture.

[0101] (3) Pour the emulsion-tannic acid suspension mixture into a 3cm cube mold, freeze at -80℃ for 24h, and then freeze dry in a vacuum freeze dryer for 16h to obtain red fire ant repellent aerogel.

[0102] Performance testing

[0103] The red imported fire ant repellent aerogel samples prepared in Examples 1-9 were subjected to storage leakage observation tests and repellency effectiveness tests. The formulations of each sample are shown in Table 1.

[0104] Table 1 Formulations of Red Fire Ant Repellent Aerogels in Examples 1-9

[0105]

[0106] 1. Observation test on leakage phenomenon during storage

[0107] (1) Test methods

[0108] The red imported fire ant repellent aerogel samples prepared in Examples 1-9 were placed flat in flat-bottomed flasks, sealed with rubber stoppers, and stored at room temperature for 30 days. During this period, the samples were weighed and the bottom of the flasks was checked for leakage every 3 days. This process was repeated 3 times.

[0109] (2) Data Analysis

[0110] 1) Analysis of the significance of differences in leakage rates of different formulations at different time points (ANOVA)

[0111] Table 1. ANOVA results of leakage rates for different formulations at different time points.

[0112] Days of test F value P value 3 1.7467 0.1551 6 1.3206 0.295 9 1.6055 0.1921 12 0.427 0.8896 15 0.8784 0.5524 18 1.053 0.4355 21 1.1956 0.3548 24 0.3339 0.9414 27 1.9988 0.106 30 0.4628 0.8663

[0113] As shown in Table 1, the p-values ​​were all much greater than 0.05 at all 10 time points, meaning that there was no significant difference in leakage rate among all samples at the same time point.

[0114] 2) Changes in leakage rate over time

[0115] According to the results of "1) Analysis of Significant Differences in Leakage Rates of Different Formulas at Different Time Points (ANOVA)," there was no significant difference in leakage rates among all samples at the same time point. Therefore, when observing the influence of time, the sample formulas were not differentiated, and the mean leakage rate of all samples was plotted to observe the trend.

[0116] like Figure 2 As shown, the leakage rate exhibits a stable and linear increasing trend over time, and the average leakage rate is less than 3% after 30 days.

[0117] (3) Test Results

[0118] During testing, observation of the bottle bottoms revealed no significant leakage in any of the nine types of aerogel, and the bottle bottoms remained relatively dry. Weight remained largely stable, with variations of less than 3%.

[0119] In summary, the observation test results of storage leakage phenomenon show that the aerogels of all formulations have low storage leakage rates and stable drug loading.

[0120] 2. Repellency Effectiveness Test

[0121] (1) Test methods

[0122] A colony of red imported fire ants (>5g) was placed in a sealed, light-transmitting box (approximately 20L), and then placed inside an 8cm-sided, completely black, opaque square box. The aerogel treatment group's box contained a piece of aerogel that had been stored at room temperature and under ventilation for 30 days (Examples 1-9). A 1cm opening was left on one side of the bottom of the box for the ant colony to enter and exit. Control groups (blank control group and aerogel groups 1-3) were also included. The experiment lasted for 3 days. At the end of the experiment, the boxes were removed, placed in sealed bags, and weighed. This was repeated 3 times.

[0123] The blank control group did not contain aerogel; that is, the box was empty during the test, with no additional objects placed inside.

[0124] Air gels 1-3 were formed by placing aerogels without repellent components in a square box, which were formed by directly mixing tannic acid suspension with 0.5wt% lignocellulose nanofibers, homogenizing at high speed, and then freeze-drying.

[0125] Specifically, the formulation of air gel group 1 is: 10% tannin suspension : 0.5wt% lignocellulose nanoparticle suspension = 1 : 8.1;

[0126] The formulation of air gel group 2 is: 20% tannin suspension : 0.5wt% lignocellulose nanoparticle suspension = 2 : 7.2;

[0127] The formulation of the air gel group 3 is: 30% tannin suspension : 0.5wt% lignocellulose nanoparticle suspension = 3 : 6.3.

[0128] (2) Data Analysis

[0129] Analysis results as follows Figure 3 As shown, at 30 days of the experiment, the weight of red imported fire ant colonies in all control groups was greater than 3.5g, while the weight of red imported fire ant colonies in all aerogel-treated groups was less than 0.5g. Difference analysis showed no significant differences between the control groups and between the aerogel-treated groups; however, all aerogel-treated groups had significantly smaller colonies than the control groups.

[0130] (3) Test Results

[0131] The weight of ant colonies in all treatment groups was less than 0.1g, while the weight of ant colonies in the control group boxes was more than 4g. This indicates that after 30 days of storage at room temperature with ventilation, all aerogel treatment groups had the ability to release repellents, and the repellent effect lasted for ≥30 days.

[0132] In summary, the repellency effectiveness test results show that, after 30 days, all aerogel treatment groups significantly inhibited nest-building behavior of red imported fire ants.

[0133] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a red imported fire ant repellent aerogel, characterized in that, Specifically, the following steps are included: (1) Mix tannic acid powder with water and stir to obtain tannic acid suspension; (2) Mix the tannic acid suspension with the red imported fire ant repellent emulsion and disperse to obtain an emulsion-tannic acid suspension mixture; (3) The emulsion-tannic acid suspension mixture is frozen and freeze-dried in sequence to obtain the red fire ant repellent aerogel.

2. The method for preparing a red imported fire ant repellent aerogel according to claim 1, characterized in that, In step (1), the concentration of the tannic acid suspension is 10wt% to 30wt%.

3. The method for preparing a red imported fire ant repellent aerogel according to claim 1, characterized in that, In step (1), the stirring device is a magnetic stirrer with a speed of 1000 rpm and a time of 72 h.

4. The method for preparing a red imported fire ant repellent aerogel according to claim 1, characterized in that, In step (2), the preparation method of the red imported fire ant repellent emulsion specifically includes the following steps: 1) Preparation and pretreatment of organic complex acids: 11) Prepare a mixed acid solution by mixing citric acid and maleic acid, and heat and stir until completely dissolved; 12) Continue heating the mixed acid solution to a certain temperature, add poplar wood powder, and stir to react; 13) After the reaction is complete, filter the solid residue, wash it off, dry it under vacuum, collect it, and place it in a desiccator. 2) Mechanical nanofibrillation treatment: 21) The dried solid residue was added to deionized water to prepare a suspension, stirred, and homogenized multiple times by step pressure increase to obtain lignocellulose nanoparticles. 22) Mix isoeugenol methyl ether with lignocellulose nanocellulose at a mass ratio of 1:9 to 9:1 and stir to prepare a red imported fire ant repellent emulsion.

5. The method for preparing a red imported fire ant repellent aerogel according to claim 4, characterized in that, In step 11), the mass ratio of citric acid to maleic acid is 3:7 to 7:3; the concentration of the mixed acid solution is 80 wt%. Step 12) The solid-liquid mass ratio of the poplar wood powder to the mixed acid solution is 1:10; the poplar wood powder is 60-80 mesh and is dried poplar wood powder dried at 105℃ for 24 hours; the temperature is further increased to 120℃ and the reaction is stirred for 180 minutes. The stirring speed in steps 11) and 12) is 1000 rpm; The vacuum drying conditions described in step 13) are 60°C for 24 hours. Step 21) The specific operation of the step-pressure multiple homogenization is as follows: homogenize twice at 3.5 MPa pressure, then homogenize three times at 30 MPa pressure, and finally homogenize 12 times at 100 MPa pressure; the content of solid residue in the suspension is 0.1 wt% to 0.5 wt%; the stirring speed is 500 rpm and the time is 12 h. Step 22) The stirring speed is 7000 rpm and the time is 1 hour.

6. The method for preparing a red imported fire ant repellent aerogel according to claim 1, characterized in that, In step (2), the mass ratio of the tannic acid suspension to the red imported fire ant repellent emulsion is 1:9 to 3:

7.

7. The method for preparing a red imported fire ant repellent aerogel according to claim 1, characterized in that, In step (2), the dispersing device is a high-speed disperser with a rotation speed of 10,000 rpm and a time of 15 min.

8. The method for preparing a red imported fire ant repellent aerogel according to claim 1, characterized in that, In step (3), the freezing equipment is a refrigerator with a temperature of -80°C and a time of 24 hours; the freeze-drying equipment is a vacuum freeze dryer with a time of 16 hours.

9. A red imported fire ant repellent aerogel prepared by the preparation method according to any one of claims 1-8.

10. The application of a red imported fire ant repellent aerogel prepared by any one of claims 1-8 in repelling red imported fire ants.

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