Wooden building anti-termite composite film as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of wooden building protection, and particularly relates to a wooden building anti-termite composite film and a preparation method and application thereof.The wooden building anti-termite composite film prepared through the preparation method of the wooden building anti-termite composite film has the good heat stability, tensile strength and flexibility, and the anti-termite effect is good. The adhesive is suitable for being attached to the surface of a wooden building to prevent insects such as termites. Meanwhile, the prepared wood building anti-termite composite film is of a stacked brick slurry structure composed of high-temperature-resistant imidacloprid / novolac epoxy resin powder and aramid nanofibers, has a long-acting protection effect, and can also avoid potential damage of chemical insecticides to wood components such as lignin and cellulose; the technical problem that an efficient wooden building anti-termite means is lacked in the prior art is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of wooden building protection, and in particular relates to a wooden building anti-ant composite film and a preparation method and application thereof. Background Art

[0002] Termites are important pests worldwide, known as "toothless tigers". Termites are insects of the order Isoptera. The scope of damage caused by termites is extremely wide, and they have deeply penetrated into all levels of the national economy. In the fields of modern civil engineering, wooden structure construction, and protection of cultural relics and historical sites, protection against termite damage has always been a key issue that needs to be solved urgently. The direct economic losses and indirect losses caused by termite infestation each year are difficult to estimate, posing a serious threat to the stability of infrastructure, the integrity of ancient buildings, and the service life of wooden furniture.

[0003] Physical barriers constructed with gravel and stainless steel mesh outside wooden buildings such as modern civil engineering, wooden structures, and cultural relics have the disadvantages of complex construction, specific requirements for building structures, and difficulty in flexibly adapting to different working conditions. In addition, they are easily damaged by mechanical forces, geological subsidence and other factors during long-term use, thereby losing their termite protection effectiveness. Although the use of chemical pesticides such as organochlorine and organophosphorus can quickly disinfect termite populations, some chemical pesticides have a corrosive effect on wood components such as lignin and cellulose in wooden buildings. Directly applying chemical pesticides on the surface of wooden buildings such as modern civil engineering, wooden structures, and cultural relics can easily damage the wooden buildings. In addition, direct application of chemical pesticides releases the chemical pesticides at a fast rate, making it difficult to achieve long-term protection and easily polluting the environment. Therefore, it is necessary to study ways to improve the prevention of termites in wooden buildings and provide efficient methods for preventing termites in wooden buildings. Summary of the invention

[0004] In view of this, the present application provides a wooden building anti-ant composite film and a preparation method and application thereof, which are used to solve the technical problem of the lack of efficient wooden building anti-ant means in the prior art.

[0005] The first aspect of the present application provides a method for preparing an anti-termite composite film for a wooden building, the preparation method comprising the following steps:

[0006] The epoxy resin and the chemical pesticide are first stirred to obtain an imidacloprid / phenolic epoxy resin mixture;

[0007] Adding an organosilicon modifier and a curing agent to the imidacloprid / phenolic epoxy resin mixture and performing a second stirring to obtain a high temperature resistant imidacloprid / phenolic epoxy resin precursor;

[0008] Curing the high temperature resistant imidacloprid / phenolic epoxy resin precursor to obtain a high temperature resistant imidacloprid / phenolic epoxy resin block;

[0009] The high temperature resistant imidacloprid / phenolic epoxy resin block is crushed to obtain the high temperature resistant imidacloprid / phenolic epoxy resin powder;

[0010] The Kevlar fiber is deprotonated in a mixed system of an alkali reagent, an organic solvent and deionized water, and then soaked and washed in deionized water, and filtered to obtain an aramid nanofiber filter cake;

[0011] adding the aramid nanofiber filter cake into deionized water to obtain an aramid nanofiber dispersion;

[0012] The high temperature resistant imidacloprid / phenolic epoxy resin powder and the aramid nanofiber dispersion are uniformly mixed and then vacuum filtered to obtain a wooden building anti-termite composite membrane.

[0013] Preferably, the epoxy resin used in the process of preparing the high temperature resistant imidacloprid / phenolic epoxy resin powder is selected from at least one of phenolic epoxy resin, glycerol epoxy resin, acrylic epoxy resin and silicone epoxy resin;

[0014] The chemical insecticide used is selected from at least one of imidacloprid, bifenthrin, avermectin, thiamethoxam and thiacloprid;

[0015] The organic silicon modifier used is at least one selected from polymethylsiloxane, polydimethylsiloxane, vinyl polydimethylsiloxane, and polymethylvinylsiloxane;

[0016] The curing agent used is at least one selected from p-phenylenediamine, ethylenediamine, and diethylenetriamine.

[0017] Preferably, the mass ratio of the epoxy resin, the chemical pesticide, the organosilicon modifier and the curing agent is: 100-150: 20-80: 0.5-2: 10-50.

[0018] Preferably, the first stirring temperature is 60-90°C and the time is 10-50 min;

[0019] The second stirring temperature is 40-60°C and the time is 1-5 minutes;

[0020] The curing temperature is room temperature and the curing time is 12 to 36 hours;

[0021] The pulverizer used for the pulverization has a rotation speed of 15000 rpm and a pulverization time of 1 to 2 hours.

[0022] Preferably, the alkaline reagent used in the deprotonation process is selected from sodium hydroxide, potassium hydroxide,

[0023] At least one of calcium chloride;

[0024] The organic solvent used is at least one selected from dimethyl sulfoxide, N,N-dimethylformamide, hexafluoroisopropanol and chloroform.

[0025] Preferably, the mass volume ratio of the Kevlar fiber, the alkaline reagent, the organic solvent and the deionized water is: 1-2 g: 1-2 g: 100-200 mL: 5-10 mL.

[0026] Preferably, the deprotonation reaction is carried out at room temperature and for 48 to 96 hours.

[0027] Preferably, the mass ratio of the high temperature resistant imidacloprid / phenolic epoxy resin powder to the aramid nanofiber in the aramid nanofiber dispersion is 30-70:70-30.

[0028] The second aspect of the present application provides a wooden building anti-termite composite film, which is prepared by the preparation method described in the first aspect; comprising high temperature resistant imidacloprid / phenolic epoxy resin powder and aramid nanofibers;

[0029] The high temperature resistant imidacloprid / phenolic epoxy resin powder and the aramid nanofiber form a stacked brick mortar structure.

[0030] The third aspect of the present application provides the application of the wooden building anti-termite composite film described in the first aspect in the fields of modern civil engineering, wooden structure buildings or cultural relics protection.

[0031] A fourth aspect of the present application provides a wooden building anti-ant structure, comprising a wooden building and the wooden building anti-ant composite film according to the first aspect;

[0032] The wooden building anti-termite composite film described in the first aspect is attached to the surface of the wooden building.

[0033] Compared with the prior art, the wooden building anti-ant composite film provided by the present application has at least the following beneficial effects:

[0034] 1. The wooden building anti-ant composite film provided in the present application has good tensile strength and flexibility, can be folded and bent at will, can be tightly attached to the surface of the wooden building, and has good thermal stability. It is not easy to be thermally decomposed when attached to the roof of the wooden building under direct sunlight, and has good stability.

[0035] 2. The stacked brick mortar structure composed of high-temperature resistant imidacloprid / phenolic epoxy resin powder and aramid nanofibers in the anti-ant composite film for wooden buildings provided in the present application, as well as the imidacloprid loaded phenolic epoxy resin, can exert a long-term protective effect; at the same time, it also avoids the potential damage caused by direct coating of imidacloprid to wood components such as lignin and cellulose in wooden buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 The surface scanning electron microscope image of the wooden building anti-ant composite film provided in Examples 1-3 of the present application;

[0038] Figure 2 This is a cross-sectional scanning electron microscope image of the wooden building anti-ant composite film provided in Examples 1-3 of the present application;

[0039] Figure 3 This is a tensile performance test diagram of the wooden building anti-ant composite film provided in Example 2 of the present application;

[0040] Figure 4 This is a flexibility test diagram of the wooden building anti-ant composite film provided in Example 2 of the present application;

[0041] Figure 5 This is a test chart of the thermal stability performance of the high-temperature resistant imidacloprid / phenolic epoxy resin powder and the wooden building anti-ant composite film provided in Example 2 of the present application. DETAILED DESCRIPTION

[0042] The present application provides a wooden building anti-ant composite film and a preparation method and application thereof, which are used to solve the technical problem of the lack of efficient wooden building anti-ant means in the prior art.

[0043] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0044] Example 1

[0045] Example 1 of the present application provides a method for preparing an anti-termite composite film for wooden buildings. The prepared anti-termite composite film for wooden buildings includes 30wt% of high-temperature resistant imidacloprid / phenolic epoxy resin powder and 70wt% of aramid nanofibers. The preparation method includes the steps of preparing the high-temperature resistant imidacloprid / phenolic epoxy resin powder, preparing the aramid nanofibers, and preparing the composite film.

[0046] The steps of preparing high temperature resistant imidacloprid / phenolic epoxy resin powder include: first weighing 120g of phenolic epoxy resin and 50g of imidacloprid, adding them into a metal container, and continuously stirring on a heating table at 80°C for 15min to uniformly disperse the imidacloprid in the phenolic epoxy resin to obtain an imidacloprid / phenolic epoxy resin mixture; then sequentially adding 1g of polymethylsiloxane and 30g of p-phenylenediamine into the imidacloprid / phenolic epoxy resin mixture and continuously stirring at 50°C for 3min to obtain a high temperature resistant imidacloprid / phenolic epoxy resin precursor; then pouring the high temperature resistant imidacloprid / phenolic epoxy resin precursor into a silicone rubber mold and curing it at room temperature for 24h to obtain a high temperature resistant imidacloprid / phenolic epoxy resin block; next, crushing the high temperature resistant imidacloprid / phenolic epoxy resin block by a mechanical crusher at room temperature at a rotation speed of 15000rpm for 1.5h to obtain a high temperature resistant imidacloprid / phenolic epoxy resin powder.

[0047] The steps of preparing aramid nanofibers include: firstly, 1.2g of Kevlar fiber, 1.8g of potassium hydroxide, 160mL of dimethyl sulfoxide, and 6.4mL of deionized water are sequentially added into a silk-mouth bottle and stirred for 72h for deprotonation to obtain an aramid nanofiber / dimethyl sulfoxide dispersion; then, the aramid nanofiber / dimethyl sulfoxide dispersion is poured into 1000mL of deionized water for immersion and cleaning for 10min; vacuum filtration is performed and the solvent is removed by washing with deionized water to obtain an aramid nanofiber filter cake; then, deionized water is added to the filter cake to prepare a 2mg / mL aramid nanofiber dispersion.

[0048] The steps of preparing the composite film include: weighing 18 mg of high-temperature resistant imidacloprid / phenolic epoxy resin powder, and mixing it with 21 mL of aramid nanofiber dispersion by a vortex mixer to obtain imidacloprid / phenolic epoxy resin anti-ant powder / aramid nanofiber dispersion, and vacuum filtering the dispersion for 3 hours to obtain a wooden building anti-ant composite film.

[0049] Example 2

[0050] Example 2 of the present application provides a method for preparing an anti-termite composite film for wooden buildings. The prepared anti-termite composite film for wooden buildings includes 50wt% of high-temperature resistant imidacloprid / phenolic epoxy resin powder and 50wt% of aramid nanofibers. The preparation method includes the steps of preparing the high-temperature resistant imidacloprid / phenolic epoxy resin powder, preparing the aramid nanofibers, and preparing the composite film.

[0051] The steps of preparing high temperature resistant imidacloprid / phenolic epoxy resin powder include: first weighing 120g of phenolic epoxy resin and 50g of imidacloprid, adding them into a metal container, and continuously stirring on a heating table at 80°C for 15min to uniformly disperse the imidacloprid in the phenolic epoxy resin to obtain an imidacloprid / phenolic epoxy resin mixture; then sequentially adding 1g of polymethylsiloxane and 30g of p-phenylenediamine into the imidacloprid / phenolic epoxy resin mixture and continuously stirring at 50°C for 3min to obtain a high temperature resistant imidacloprid / phenolic epoxy resin precursor; then pouring the high temperature resistant imidacloprid / phenolic epoxy resin precursor into a silicone rubber mold and curing it at room temperature for 24h to obtain a high temperature resistant imidacloprid / phenolic epoxy resin block; next, crushing the high temperature resistant imidacloprid / phenolic epoxy resin block by a mechanical crusher at room temperature at a rotation speed of 15000rpm for 1.5h to obtain a high temperature resistant imidacloprid / phenolic epoxy resin powder.

[0052] The steps of preparing aramid nanofibers include: firstly, 1.2g of Kevlar fiber, 1.8g of potassium hydroxide, 160mL of dimethyl sulfoxide, and 6.4mL of deionized water are sequentially added into a silk-mouth bottle and stirred for 72h for deprotonation to obtain an aramid nanofiber / dimethyl sulfoxide dispersion; then, the aramid nanofiber / dimethyl sulfoxide dispersion is poured into 1000mL of deionized water and soaked for 10min; vacuum filtration is performed and the solvent is washed with deionized water to remove the solvent, and an aramid nanofiber filter cake is obtained; then, deionized water is added to the filter cake to prepare a 2mg / mL aramid nanofiber dispersion.

[0053] The steps of preparing the composite film include: weighing 18 mg of high-temperature resistant imidacloprid / phenolic epoxy resin powder, and mixing it with 9 mL of aramid nanofiber dispersion by a vortex mixer to obtain imidacloprid / phenolic epoxy resin anti-ant powder / aramid nanofiber dispersion, and vacuum filtering the dispersion for 3 hours to obtain a wooden building anti-ant composite film.

[0054] Example 3

[0055] Example 3 of the present application provides a method for preparing an anti-termite composite film for wooden buildings. The prepared anti-termite composite film for wooden buildings includes 70wt% of high-temperature resistant imidacloprid / phenolic epoxy resin powder and 30wt% of aramid nanofibers. The preparation method includes the steps of preparing the high-temperature resistant imidacloprid / phenolic epoxy resin powder, preparing the aramid nanofibers, and preparing the composite film.

[0056] The steps of preparing high temperature resistant imidacloprid / phenolic epoxy resin powder include: first weighing 120g of phenolic epoxy resin and 50g of imidacloprid, adding them into a metal container, and continuously stirring on a heating table at 80°C for 15min to uniformly disperse the imidacloprid in the phenolic epoxy resin to obtain an imidacloprid / phenolic epoxy resin mixture; then sequentially adding 1g of polymethylsiloxane and 30g of p-phenylenediamine into the imidacloprid / phenolic epoxy resin mixture and continuously stirring at 50°C for 3min to obtain a high temperature resistant imidacloprid / phenolic epoxy resin precursor; then pouring the high temperature resistant imidacloprid / phenolic epoxy resin precursor into a silicone rubber mold and curing it at room temperature for 24h to obtain a high temperature resistant imidacloprid / phenolic epoxy resin block; next, crushing the high temperature resistant imidacloprid / phenolic epoxy resin block by a mechanical crusher at room temperature at a rotation speed of 15000rpm for 1.5h to obtain a high temperature resistant imidacloprid / phenolic epoxy resin powder.

[0057] The steps of preparing aramid nanofibers include: firstly, 1.2g Kevlar fiber, 1.8g potassium hydroxide, 160mL dimethyl sulfoxide, and 6.4mL deionized water are sequentially added into a silk-mouth bottle and stirred for 72h for deprotonation to obtain an aramid nanofiber / dimethyl sulfoxide dispersion; then, the aramid nanofiber / dimethyl sulfoxide dispersion is poured into 1000mL deionized water for immersion and cleaning for 10min; vacuum filtration is performed and the solvent is washed with deionized water to remove the solvent, and an aramid nanofiber filter cake is obtained; then, deionized water is added to the filter cake to prepare a 2mg / mL aramid nanofiber dispersion.

[0058] The steps of preparing the composite film include: weighing 18 mg of high-temperature resistant imidacloprid / phenolic epoxy resin powder, and mixing it with 4 mL of aramid nanofiber dispersion by a vortex mixer to obtain imidacloprid / phenolic epoxy resin anti-ant powder / aramid nanofiber dispersion, and vacuum filtering the dispersion for 3 hours to obtain a wooden building anti-ant composite film.

[0059] Experimental Example 1

[0060] Experimental Example 1 of the present application performs performance tests on the wooden building anti-ant composite films provided in Examples 1-3, including microstructure tests, mechanical property tests, and thermal property tests.

[0061] The microstructure test was carried out by scanning electron microscopy. The surface and cross-section scanning electron microscopy images of the wooden building anti-termite composite film provided in Example 1 are as follows: Figure 1 a and Figure 2 The surface and cross-section scanning electron microscope images of the wooden building anti-termite composite film provided in Example 2 are as shown in FIG. Figure 1 b and Figure 2 The surface and cross-section scanning electron microscope images of the wooden building anti-termite composite film provided in Example 3 are shown in FIG. Figure 1 c and Figure 2 c; from Figure 1 and Figure 2 It can be seen that the wooden building anti-ant composite films provided in Examples 1-3 are all stacked brick mortar structures, in which the high temperature resistant imidacloprid / phenolic epoxy resin powder with a particle size of 50-100μm is a brick structure, and the aramid nanofiber acts as a slurry, and as the doping amount of the high temperature resistant imidacloprid / phenolic epoxy resin powder increases, the surface roughness of the wooden building anti-ant composite film increases, and the wooden building anti-ant composite film provided in Example 3 has the largest roughness; however, no matter whether the doping amount of the high temperature resistant imidacloprid / phenolic epoxy resin powder is 30wt% or 70wt%, the high temperature resistant imidacloprid / phenolic epoxy resin powder does not scatter, indicating that the present application improves the interface bonding force between the aramid nanofibers and the high temperature resistant imidacloprid / phenolic epoxy resin powder through deprotonation treatment, so that the wooden building anti-ant composite film is an overall paper film shape, and the paper film shape is conducive to attachment and wrapping.

[0062] The tensile test in the mechanical properties test was carried out using a universal testing machine, with a specimen gauge length of 10 mm and a tensile rate of 1 mm / min. The results are as follows: Figure 3 As shown, the flexibility test is Figure 4 shown; from Figure 3 It can be seen that the tensile strength of the wooden building anti-termite composite film provided in Example 2 is about 13.9 MPa, which is a good tensile strength; Figure 4 In Figure 4 a fold in half, Figure 4 c folds in half and then recovers. Figure 4 b bending, Figure 4 As shown in the figure, the recovery after bending d shows that the flexibility of the wooden building anti-termite composite film of Example 2 is good, and it can be folded and bent at will, so it is suitable for wooden buildings of various shapes. The wooden building anti-termite composite film can be tightly attached to the surface of the wooden building to play the effect of preventing termites and other insects; at the same time, the stacked brick mortar structure composed of the high temperature resistant imidacloprid / phenolic epoxy resin powder and aramid nanofibers avoids the direct exposure of imidacloprid to natural environments such as air and sunlight, slows down the release rate, and is conducive to the extension of the protective effectiveness of imidacloprid. The chemical insecticide imidacloprid in the high temperature resistant imidacloprid / phenolic epoxy resin powder is dispersed and loaded in the high temperature resistant resin, which can avoid the potential damage of directly coating imidacloprid to wooden buildings and provide better long-term protection effect.

[0063] In the thermal performance test, thermal stability was tested using a thermogravimetric analyzer. The test temperature range was 40-800°C, and the heating rate was set to 10°C / min in a nitrogen atmosphere. The test results are as follows: Figure 5 As shown in Table 1; Figure 5As can be seen from Table 1, the high temperature resistant imidacloprid / phenolic epoxy resin powder retains more than 50% of its mass at 400°C and has good thermal stability, indicating that the use of phenolic epoxy resin and the introduction of silicone modifiers such as polymethylsiloxane can provide imidacloprid / phenolic epoxy resin powder with good thermal stability; on this basis, the wooden building anti-ant composite film prepared by adding aramid nanofibers still retains more than 76% of its mass at 400°C, and the initial decomposition temperature is above 200°C, which shows that the wooden building anti-ant composite film has good thermal stability and is not easy to thermally decompose. It is not easy to thermally decompose when exposed to the sun for a long time, which is conducive to providing long-term protection; and when the wooden building anti-ant composite film is tightly attached to the roof of the wooden building, it does not thermally decompose when exposed to high temperature in the daytime, has good stability, and is suitable for roof protection of wooden buildings.

[0064] Table 1: Thermal performance test results

[0065]

[0066] It can be seen from the above experimental tests that the wooden building anti-ant composite film provided by the present application uses phenolic epoxy resin powder to disperse and load the chemical insecticide imidacloprid, introduces silicone modifiers such as polymethylsiloxane, and adds deprotonated aramid nanofibers to form a brick mortar structure. The wooden building anti-ant composite film has good interface bonding force, and the wooden building anti-ant composite film has excellent flexibility, tensile strength and thermal stability, and can be adhered to the surfaces of wooden buildings of various shapes. At the same time, the chemical insecticide imidacloprid can also release insecticidal components for a long time and is difficult to corrode lignin and cellulose. Therefore, the wooden building anti-ant composite film provided by the present application can provide long-term and effective protection for wooden buildings, overcoming the current lack of efficient wooden building anti-ant means.

[0067] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preparing an anti-termite composite film for wooden buildings, characterized in that: The following steps are involved: The epoxy resin and the chemical pesticide are first stirred to obtain an imidacloprid / phenolic epoxy resin mixture; Adding an organosilicon modifier and a curing agent to the imidacloprid / phenolic epoxy resin mixture and performing a second stirring to obtain a high temperature resistant imidacloprid / phenolic epoxy resin precursor; Curing the high temperature resistant imidacloprid / phenolic epoxy resin precursor to obtain a high temperature resistant imidacloprid / phenolic epoxy resin block; The high temperature resistant imidacloprid / phenolic epoxy resin block is crushed to obtain the high temperature resistant imidacloprid / phenolic epoxy resin powder; The Kevlar fiber is deprotonated in a mixed system of an alkali reagent, an organic solvent and deionized water, and then soaked and washed in deionized water, and filtered to obtain an aramid nanofiber filter cake; adding the aramid nanofiber filter cake into deionized water to obtain an aramid nanofiber dispersion; The high temperature resistant imidacloprid / phenolic epoxy resin powder and the aramid nanofiber dispersion are uniformly mixed and then vacuum filtered to obtain a wooden building anti-termite composite membrane.

2. The method for preparing a wooden building anti-termite composite film according to claim 1, characterized in that: The epoxy resin is selected from at least one of phenolic epoxy resin, glycerol epoxy resin, acrylic epoxy resin, and silicone epoxy resin; The chemical insecticide is selected from at least one of imidacloprid, bifenthrin, avermectin, thiamethoxam and thiacloprid; The organosilicon modifier is selected from at least one of polymethylsiloxane, polydimethylsiloxane, vinyl polydimethylsiloxane and polymethylvinylsiloxane; The curing agent is selected from at least one of p-phenylenediamine, ethylenediamine and diethylenetriamine.

3. The method for preparing a wooden building anti-termite composite film according to claim 1, characterized in that: The mass ratio of the epoxy resin, the chemical pesticide, the organosilicon modifier and the curing agent is: 100-150: 20-80: 0.5-2: 10-50.

4. The method for preparing a wooden building anti-termite composite film according to claim 1, characterized in that: The first stirring temperature is 60-90°C and the time is 10-50min; The second stirring temperature is 40-60°C and the time is 1-5 minutes; The curing temperature is room temperature and the curing time is 12 to 36 hours; The pulverizer used for the pulverization has a rotation speed of 15000 rpm and a pulverization time of 1 to 2 hours.

5. The method for preparing a wooden building anti-termite composite film according to claim 1, characterized in that: The alkaline reagent is selected from at least one of sodium hydroxide, potassium hydroxide and calcium hydroxide; The organic solvent is selected from at least one of dimethyl sulfoxide, N,N-dimethylformamide, hexafluoroisopropanol and chloroform.

6. The method for preparing a wooden building anti-termite composite film according to claim 1, characterized in that: The mass volume ratio of the Kevlar fiber, the alkaline reagent, the organic solvent and the deionized water is: 1-2 g: 1-2 g: 100-200 mL: 5-10 mL.

7. The method for preparing a wooden building anti-termite composite film according to claim 1, characterized in that: The mass ratio of the high temperature resistant imidacloprid / phenolic epoxy resin powder to the aramid nanofiber in the aramid nanofiber dispersion is 30-70:70-30.

8. A wooden building anti-termite composite film, characterized in that: Includes high temperature resistant imidacloprid / phenolic epoxy resin powder and aramid nanofiber; The high temperature resistant imidacloprid / phenolic epoxy resin powder and the aramid nanofiber form a stacked brick mortar structure.

9. Application of a wooden building anti-termite composite film prepared by the preparation method according to any one of claims 1 to 7 in the fields of modern civil engineering, wooden structure buildings or cultural relics protection.

10. A wooden building anti-ant structure, characterized in that: A wooden building and a wooden building anti-termite composite film prepared by the preparation method according to any one of claims 1 to 7; The wooden building anti-termite composite film prepared by the preparation method according to any one of claims 1 to 7 is attached to the surface of the wooden building.

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