A wood preservative and insect repellent and preparation method thereof

Abstract

The invention relates to the technical field of wood preservatives and insect repellents, and discloses a wood preservative and insect repellent and a preparation method thereof. The invention comprises the following steps: heating polyformaldehyde, acetone monomer and polyetheramine for reaction; acylation reaction of the reaction product to obtain an active agent; heating polyformaldehyde, acetone monomer and m-aminophenylacetylene for reaction to obtain an intermediate; adding benzyl azide to the intermediate under the action of tert-butyl alcohol and cuprous iodide to react to obtain a preservative; heating modified chitosan to react with activated diethyltriamine pentaacetic acid to obtain a modified chelating agent; adding the preservative to tetrahydrofuran for ultrasonic dispersion, adding the active agent and the modified chelating agent for ultrasonic dispersion, adding an insecticide and water for uniform stirring to obtain the wood preservative and insect repellent.

Description

Technical Field

[0001] The invention relates to the technical field of wood preservatives and insect repellents, in particular to a wood preservative and insect repellent and a preparation method thereof. Background Art

[0002] The biodegradation of wood is commonly known as decay, which is mainly caused by the invasion of microorganisms and insects. To improve the anti-biological degradation performance of wood, we must start from the two aspects of inhibiting microorganisms and insects. Common microorganisms include wood decaying fungi, discoloration fungi and molds; among them, wood decaying fungi include white rot fungi, brown rot fungi and soft rot fungi; common insects include termites; therefore, inhibiting the growth of bacteria and the damage of termites to achieve the anti-corrosion and anti-insect treatment of wood is of great significance for saving wood and improving its utilization efficiency.

[0003] Therefore, it is of great significance to invent a wood preservative and insect repellent Summary of the invention

[0004] The object of the present invention is to provide a wood preservative and insect repellent and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for preparing a wood preservative and insect repellent comprises the following steps:

[0007] S1: Add paraformaldehyde, acetone monomer and polyetheramine to dioxane, react at 80-85°C for 5-6h, and dry by rotary evaporation at 40-45°C for 5-6h. Add the reaction product to tetrahydrofuran, add acetyl chloride solution, stir and react for 5-6h, and rotary evaporate at 40-45°C for 3-4h to obtain an active agent.

[0008] S2: Add paraformaldehyde to deionized water and stir evenly, add acetone monomer and toluene and stir evenly, add m-aminophenylacetylene and react at 80-85°C for 6-8h to obtain an intermediate; add benzyl azide to N,N-dimethyltoluidine and stir evenly, add tert-butyl alcohol and cuprous iodide and stir for 5-10min, add the intermediate and stir at 30-35°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0009] S3: Add diethyltriamine pentaacetic acid to deionized water and stir evenly, add sodium hydroxide and heat to 40-45°C and stir evenly, add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide and stir for 3-3.5 hours, add modified chitosan and keep warm for 4-5 hours, wash, and dry to obtain a modified chelating agent;

[0010] S4: adding the preservative to tetrahydrofuran and ultrasonically dispersing the mixture for 45-60 minutes, adding the active agent and the modified chelating agent and ultrasonically dispersing the mixture for 45-60 minutes, adding the insecticide and water and stirring evenly to obtain a wood preservative and insect repellent.

[0011] Furthermore, the method for preparing acetone monomer comprises the following steps:

[0012] Add p-hydroxybenzaldehyde, desiccant and catalyst into methanol, heat to 50-55°C acetone methanol solution to react for 1-1.5h, add the reaction product into deionized water, filter, and dry at 80-85°C for 12-24h to obtain acetone monomer.

[0013] Furthermore, the mass ratio of p-hydroxybenzaldehyde: desiccant: catalyst: acetone is 1:(2-6):(0.1-0.2):(0.8-1); the desiccant is anhydrous calcium chloride; the catalyst is boron trifluoride etherate; and the concentration of the acetone methanol solution is 30-35wt%.

[0014] Furthermore, the modified chitosan preparation method comprises the following steps:

[0015] Add chitosan to acetic acid aqueous solution, add formaldehyde solution and stir evenly, add 4-hydroxybenzenesulfonic acid aqueous solution and stir for 10-15 minutes, add deionized water and reflux reaction for 8-10 hours, stand and cool, dialyze, and freeze-dry to obtain modified chitosan.

[0016] Furthermore, the mass ratio of chitosan: formaldehyde solution: 4-hydroxybenzenesulfonic acid aqueous solution is (1-1.5):1:(2-3); the concentration of the formaldehyde solution is 37-40wt%; and the concentration of the 4-hydroxybenzenesulfonic acid aqueous solution is 33-35wt%.

[0017] Furthermore, the mass ratio of the paraformaldehyde: acetone monomer: polyetheramine: acetyl chloride is (0.14-0.2): (2.5-3): 2: (0.05-0.06); and the concentration of the acetyl chloride solution is 1-1.05wt%.

[0018] Furthermore, the mass ratio of the paraformaldehyde: acetone monomer: m-aminophenylacetylene is 1: (1.9-2.1): (1.95-2); the mass ratio of the benzyl azide: cuprous iodide: intermediate is (2.2-2.5): 0.01: (5-6).

[0019] Furthermore, the mass ratio of diethyltriaminepentaacetic acid:1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride:N-hydroxysuccinimide:modified chitosan is 1:1:0.6:(1-3).

[0020] Furthermore, the proportions of the raw materials of each component in the wood preservative and insect repellent are, by mass, 45-50 parts of preservative, 500-600 parts of tetrahydrofuran, 15-30 parts of active agent, 10-20 parts of modified chelating agent, 5-10 parts of insecticide, and 200-300 parts of water.

[0021] Furthermore, the insecticide is cyhalothrin.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0023] The invention uses p-hydroxybenzaldehyde as a main raw material and uses boron trifluoride ethyl ether as a catalyst to prepare an acetone monomer containing a phenolic hydroxyl structure; in order to maintain the catalytic activity of boron trifluoride ethyl ether, promote the forward progress of the reaction, and improve the yield, anhydrous calcium chloride is introduced into the reaction process as a desiccant to reduce the reaction time, protect the catalytic activity of boron trifluoride ethyl ether, and achieve the purpose of improving the yield;

[0024] The invention uses self-made acetone monomer as a main raw material, and prepares a benzoxazine intermediate with ultraviolet light-heat dual curing performance under the action of m-aminophenylacetylene and polyformaldehyde; then reacts with benzyl azide to prepare a benzoxazine containing triazole and benzyl structure as a preservative; the traditional heat-curing benzoxazine resin has the problems of high curing temperature and long curing time, and long-term high temperature will cause the color of wood to change, and easy thermal decomposition will cause the quality and strength of wood to decrease; by introducing acetone monomer with light curing performance, the preservative A is given light curing performance, and under the action of light, the double bonds in the molecular structure of the acetone monomer can form two cyclobutane structures, so that the benzoxazine resin molecular chains are connected together, and the viscous state is changed into a solid state, so that the resin can play a synergistic curing role under lower temperature and light than high temperature. At the same time, the phenolic and benzyl functional groups carried by the oxazine structure in the preservative after ring opening have positive antibacterial effects, and the 1,2,3-triazole structure can also improve the antibacterial activity of the preservative itself, which can inactivate the sulfhydryl groups in the bacterial plasma membrane and destroy the integrity of the bacterial cell membrane, thereby achieving the effect of antibacterial preservation.

[0025] In the process of wood decay, brown rot fungi far exceed white rot fungi in terms of quantity and degradation rate of wood; brown rot fungi can absorb iron ions from the soil and reduce iron ions to ferrous ions under the action of a reducing agent, and then react with hydrogen peroxide secreted by itself to produce free radicals to achieve damage to the cell wall of wood. Therefore, how to inhibit the reduction of iron ions by brown rot fungi has also become a key factor in wood preservation. The present invention selects diethyltriamine pentaacetic acid as a chelating agent to be introduced into the preservative and insect repellent, and its addition has the effect of inhibiting the reduction of iron ions to ferrous ions. In order for the chelating agent to be evenly dispersed in the preservative and insect repellent, the present invention introduces a benzoxazine structure into chitosan by reacting the amino group of chitosan with formaldehyde and 4-hydroxybenzenesulfonic acid to obtain modified chitosan, and then grafts diethyltriamine pentaacetic acid on the surface of the modified chitosan to improve the dispersion performance in the matrix, so that the preservative and the chelating agent can work synergistically, greatly improving the performance of antibacterial and antiseptic.

[0026] In order to further improve the dispersibility of each component in the antiseptic and insect repellent, the present invention reacts a homemade acetone monomer with polyetheramine and polyformaldehyde to prepare a multi-block benzoxazine structure active agent, and then removes excess phenolic hydroxyl groups through an acylation reaction to avoid the inhibition of photopolymerization by the excess phenolic hydroxyl groups; the active agent with a similar structure has the following effects: first, it can enhance the dispersibility of each component in a matrix, so that the insecticide, preservative and chelating agent can be evenly dispersed in the matrix; secondly, it also has an acetone monomer molecular structure that can enhance the light curing performance of the antiseptic and insect repellent; finally, the addition of the active agent can enhance the permeability of the antiseptic and insect repellent, preventing the damage of the wood from the outside to the inside while preventing the damage from the inside to the outside, thereby greatly improving the antiseptic and insect repellent performance of the wood. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the following examples, paraformaldehyde, specification 97%, was purchased from Alfa Aesar (China) Chemical Co., Ltd., polyetheramine, model ED2003, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, was purchased from Shanghai MacLean Biochemical Co., Ltd., N-hydroxysuccinimide, was purchased from Shanghai MacLean Biochemical Co., Ltd., chitosan, deacetylation degree 85%, average molecular weight 1 million, was purchased from Zhejiang Jinke Biochemical Priority Co., Ltd., and the remaining raw materials were commercially available;

[0029] The method for preparing acetone monomer comprises the following steps:

[0030] 1 g of p-hydroxybenzaldehyde, 4 g of anhydrous calcium chloride and 0.1 g of boron trifluoride etherate were added to 10 mL of methanol, heated to 50°C and reacted with 2.85 g of 35 wt% acetone methanol solution for 1 h. The reaction product was added to 500 mL of deionized water, filtered, and dried at 80°C for 12 h to obtain acetone monomer;

[0031] The modified chitosan preparation method comprises the following steps:

[0032] Add 2 g of chitosan to 100 mL of 2 wt % acetic acid aqueous solution, add 2 mL of 37 wt % formaldehyde solution and stir evenly, add 4 mL of 33 wt % 4-hydroxybenzenesulfonic acid aqueous solution and stir for 10 min, add 100 mL of deionized water and reflux for 8-10 h, let stand to cool, dialyze, and freeze-dry to obtain modified chitosan.

[0033] Example 1: A method for preparing a wood preservative and insect repellent: S1: 0.14 g of paraformaldehyde, 2.5 g of acetone monomer and 2 g of polyetheramine were added to 5 mL of dioxane, reacted at 80°C for 5 h, and dried by rotary evaporation at 40°C for 5 h. The reaction product was added to 5 mL of tetrahydrofuran, and 5 g of 1 wt% acetyl chloride tetrahydrofuran solution was added, stirred and reacted for 5 h, and rotary evaporation was performed at 40°C for 3 h to obtain an active agent.

[0034] S2: Add 10g of paraformaldehyde to 25mL of deionized water and stir evenly, add 19g of acetone monomer and 20mL of toluene and stir evenly, add 19.5g of m-aminophenylacetylene and react at 80°C for 6h to obtain an intermediate; add 2.2g of benzyl azide to 10mL of N,N-dimethyltoluidine and stir evenly, add 2mL of tert-butyl alcohol and 0.01g of cuprous iodide and stir for 5min, add 5g of the intermediate and stir at 30°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0035] S3: Add 1 g of diethyltriamine pentaacetic acid to 240 mL of deionized water and stir evenly, add 1 M sodium hydroxide to dissolve the diethyltriamine pentaacetic acid, heat to 40 ° C and stir evenly, add 1 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 0.6 g of N-hydroxysuccinimide and stir for 3 h, add 1 g of modified chitosan and keep warm for 4 h, wash, and dry to obtain a modified chelating agent;

[0036] S4: Add 45g of preservative to 500g of tetrahydrofuran and disperse by ultrasonic for 45min, add 15g of active agent and 10g of modified chelating agent and disperse by ultrasonic for 45min, add 5g of insecticide and 200g of water and stir evenly to obtain a wood preservative and insect repellent.

[0037] Example 2: A method for preparing a wood preservative and insect repellent: S1: 0.16 g of paraformaldehyde, 2.5 g of acetone monomer and 2 g of polyetheramine were added to 5 mL of dioxane, reacted at 80°C for 5 h, and dried by rotary evaporation at 40°C for 5 h. The reaction product was added to 5 mL of tetrahydrofuran, and 5 g of 1 wt% acetyl chloride tetrahydrofuran solution was added, stirred and reacted for 5 h, and rotary evaporation was performed at 40°C for 3 h to obtain an active agent.

[0038] S2: Add 10g of paraformaldehyde to 25mL of deionized water and stir evenly, add 20g of acetone monomer and 20mL of toluene and stir evenly, add 20g of m-aminophenylacetylene and react at 80°C for 6h to obtain an intermediate; add 2.4g of benzyl azide to 10mL of N,N-dimethyltoluidine and stir evenly, add 2mL of tert-butyl alcohol and 0.01g of cuprous iodide and stir for 5min, add 5g of the intermediate and stir at 30°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0039] S3: Add 1 g of diethyltriamine pentaacetic acid to 240 mL of deionized water and stir evenly, add 1 M sodium hydroxide to dissolve the diethyltriamine pentaacetic acid, heat to 40 ° C and stir evenly, add 1 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 0.6 g of N-hydroxysuccinimide and stir for 3 h, add 2 g of modified chitosan and keep warm for 4 h, wash, and dry to obtain a modified chelating agent;

[0040] S4: Add 45g of preservative to 600g of tetrahydrofuran and disperse by ultrasonic for 45min, add 25g of active agent and 15g of modified chelating agent and disperse by ultrasonic for 45min, add 10g of insecticide and 250g of water and stir evenly to obtain a wood preservative and insect repellent.

[0041] Example 3: A method for preparing a wood preservative and insect repellent: S1: 0.2 g of paraformaldehyde, 3 g of acetone monomer and 2 g of polyetheramine were added to 5 mL of dioxane, reacted at 80°C for 5 h, and dried by rotary evaporation at 40°C for 5 h. The reaction product was added to 5 mL of tetrahydrofuran, and 5 g of 1 wt% acetyl chloride tetrahydrofuran solution was added, stirred and reacted for 5 h, and rotary evaporation was performed at 40°C for 3 h to obtain an active agent.

[0042] S2: Add 10g of paraformaldehyde to 25mL of deionized water and stir evenly, add 21g of acetone monomer and 20mL of toluene and stir evenly, add 20g of m-aminophenylacetylene and react at 80°C for 6h to obtain an intermediate; add 2.5g of benzyl azide to 10mL of N,N-dimethyltoluidine and stir evenly, add 2mL of tert-butyl alcohol and 0.01g of cuprous iodide and stir for 5min, add 6g of the intermediate and stir at 30°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0043] S3: Add 1 g of diethyltriamine pentaacetic acid to 240 mL of deionized water and stir evenly, add 1 M sodium hydroxide to dissolve the diethyltriamine pentaacetic acid, heat to 40 ° C and stir evenly, add 1 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 0.6 g of N-hydroxysuccinimide and stir for 3 h, add 3 g of modified chitosan and keep warm for 4 h, wash, and dry to obtain a modified chelating agent;

[0044] S4: Add 50g of preservative to 600g of tetrahydrofuran and ultrasonically disperse for 45min, add 30g of active agent and 20g of modified chelating agent and ultrasonically disperse for 45min, add 10g of insecticide and 300g of water and stir evenly to obtain a wood preservative and insect repellent.

[0045] Comparative Example 1: A method for preparing a wood preservative and insect repellent: S1: 0.14 g of polyformaldehyde, 2.5 g of acetone monomer and 2 g of polyetheramine were added to 5 mL of dioxane, reacted at 80°C for 5 h, and dried by rotary evaporation at 40°C for 5 h. The reaction product was added to 5 mL of tetrahydrofuran, and 5 g of 1 wt% acetyl chloride tetrahydrofuran solution was added, stirred and reacted for 5 h, and rotary evaporation was performed at 40°C for 3 h to obtain an active agent.

[0046] S2: Add 10g of paraformaldehyde to 25mL of deionized water and stir evenly, add 19g of acetone monomer and 20mL of toluene and stir evenly, add 19.5g of m-aminophenylacetylene and react at 80°C for 6h to obtain an intermediate; add 2.2g of benzyl azide to 10mL of N,N-dimethyltoluidine and stir evenly, add 2mL of tert-butyl alcohol and 0.01g of cuprous iodide and stir for 5min, add 5g of the intermediate and stir at 30°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0047] S3: Add 45 g of preservative to 500 g of tetrahydrofuran and disperse by ultrasonic for 45 min, add 15 g of active agent and disperse by ultrasonic for 45 min, add 5 g of insecticide and 200 g of water and stir evenly to obtain a wood preservative and insect repellent.

[0048] Comparative Example 2: A method for preparing a wood preservative and insect repellent: S1: Add 10g of polyformaldehyde to 25mL of deionized water and stir evenly, add 19g of acetone monomer and 20mL of toluene and stir evenly, add 19.5g of m-aminophenylacetylene and react at 80°C for 6h to obtain an intermediate; add 2.2g of benzyl azide to 10mL of N,N-dimethyltoluidine and stir evenly, add 2mL of tert-butyl alcohol and 0.01g of cuprous iodide and stir for 5min, add 5g of the intermediate and stir at 30°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0049] S2: Add 1 g of diethyltriamine pentaacetic acid to 240 mL of deionized water and stir evenly, add 1 M sodium hydroxide to dissolve the diethyltriamine pentaacetic acid, heat to 40 ° C and stir evenly, add 1 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 0.6 g of N-hydroxysuccinimide and stir for 3 h, add 1 g of modified chitosan and keep warm for 4 h, wash, and dry to obtain a modified chelating agent;

[0050] S3: Add 45 g of preservative to 500 g of tetrahydrofuran and disperse it ultrasonically for 45 min, add 10 g of modified chelating agent and disperse it ultrasonically for 45 min, add 5 g of insecticide and 200 g of water and stir evenly to obtain a wood preservative and insect repellent.

[0051] Comparative Example 3: A method for preparing a wood preservative and insect repellent: S1: 0.14 g of polyformaldehyde, 2.5 g of acetone monomer and 2 g of polyetheramine were added to 5 mL of dioxane, reacted at 80°C for 5 h, and dried by rotary evaporation at 40°C for 5 h. The reaction product was added to 5 mL of tetrahydrofuran, and 5 g of 1 wt% acetyl chloride tetrahydrofuran solution was added, stirred and reacted for 5 h, and rotary evaporation was performed at 40°C for 3 h to obtain an active agent.

[0052] S2: Add 10g of paraformaldehyde to 25mL of deionized water and stir evenly, add 19g of acetone monomer and 20mL of toluene and stir evenly, add 19.5g of m-aminophenylacetylene and react at 80°C for 6h to obtain an intermediate; add 2.2g of benzyl azide to 10mL of N,N-dimethyltoluidine and stir evenly, add 2mL of tert-butyl alcohol and 0.01g of cuprous iodide and stir for 5min, add 5g of the intermediate and stir at 30°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative;

[0053] S3: Add 45g of preservative to 500g of tetrahydrofuran and ultrasonically disperse for 45min, add 15g of active agent and 10g of diethyltriaminepentaacetic acid and ultrasonically disperse for 45min, add 5g of insecticide and 200g of water and stir evenly to obtain a wood preservative and insect repellent.

[0054] Test: Anticorrosion performance test: Process the Scots pine wood into 10mm×20mm×20mm test pieces; spray the anticorrosion and insect repellent on the wood surface with a thickness of 20μm, light cure for 1h, and obtain the test sample; refer to the forestry industry standard LY / T1283-1998 "Laboratory test method for toxicity of wood preservatives to decay fungi" and the national standard GB / T 13942.1-92 "Laboratory test method for natural corrosion resistance of wood". Mass loss rate = (original mass of wood - mass of wood after decay) / original mass of wood.

[0055] Insect-proof performance test: Process the larch wood into 10mm×20mm×20mm test pieces; spray the antiseptic and insect-proof agent on the wood surface with a thickness of 20μm, light-cured for 1h, and obtain the test sample; bury it in the field for half a year for testing. The termite-infestation integrity value ranges from 1-10, with 10 being intact.

[0056] Table 1 Anticorrosion performance test data

[0057]

[0058] Conclusion: The preservatives and insect repellents prepared in Examples 1-3 have excellent preservative and insect repellent performance. In Comparative Example 1, no modified chelating agent was added, resulting in decreased preservative performance; in Comparative Example 2, no active agent was added, resulting in decreased dispersibility of each component and decreased preservative and insect repellent performance; in Comparative Example 3, diethyltriamine pentaacetic acid was directly added, resulting in decreased preservative performance;

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a wood preservative and insect repellent, characterized in that: The following steps are involved: S1: Add paraformaldehyde, acetone monomer and polyetheramine to dioxane, react at 80-85°C for 5-6h, and dry by rotary evaporation at 40-45°C for 5-6h. Add the reaction product to tetrahydrofuran, add acetyl chloride solution, stir and react for 5-6h, and rotary evaporate at 40-45°C for 3-4h to obtain an active agent. S2: Add paraformaldehyde to deionized water and stir evenly, add acetone monomer and toluene and stir evenly, add m-aminophenylacetylene and react at 80-85°C for 6-8h to obtain an intermediate; add benzyl azide to N,N-dimethyltoluidine and stir evenly, add tert-butyl alcohol and cuprous iodide and stir for 5-10min, add the intermediate and stir at 30-35°C for 24h, add the organic layer to deionized water, filter, wash, and dry to obtain a preservative; S3: Add diethyltriamine pentaacetic acid to deionized water and stir evenly, add sodium hydroxide and heat to 40-45°C and stir evenly, add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide and stir for 3-3.5 hours, add modified chitosan and keep warm for 4-5 hours, wash, and dry to obtain a modified chelating agent; S4: adding the preservative to tetrahydrofuran and ultrasonically dispersing for 45-60 minutes, adding the active agent and the modified chelating agent and ultrasonically dispersing for 45-60 minutes, adding the insecticide and water and stirring evenly to obtain a wood preservative and insect repellent; The method for preparing acetone monomer comprises the following steps: Add p-hydroxybenzaldehyde, desiccant and catalyst into methanol, heat to 50-55°C acetone methanol solution to react for 1-1.5h, add the reaction product into deionized water, filter, and dry at 80-85°C for 12-24h to obtain acetone monomer; The modified chitosan preparation method comprises the following steps: Add chitosan to acetic acid aqueous solution, add formaldehyde solution and stir evenly, add 4-hydroxybenzenesulfonic acid aqueous solution and stir for 10-15 minutes, add deionized water and reflux for 8-10 hours, cool and dialyze, and freeze-dry to obtain modified chitosan; In the preparation process of the modified chelating agent, the mass ratio of diethyltriaminepentaacetic acid:1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride:N-hydroxysuccinimide:modified chitosan is 1:1:0.6:(1-3).

2. The method for preparing a wood preservative and insect repellent according to claim 1, characterized in that: The mass ratio of p-hydroxybenzaldehyde: desiccant: catalyst: acetone is 1:(2-6):(0.1-0.2):(0.8-1); the desiccant is anhydrous calcium chloride; the catalyst is boron trifluoride etherate; and the concentration of the acetone methanol solution is 30-35wt%.

3. The method for preparing a wood preservative and insect repellent according to claim 1, characterized in that: The mass ratio of chitosan: formaldehyde solution: 4-hydroxybenzenesulfonic acid aqueous solution is (1-1.5):1:(2-3); the concentration of the formaldehyde solution is 37-40wt%; the concentration of the 4-hydroxybenzenesulfonic acid aqueous solution is 33-35wt%.

4. The method for preparing a wood preservative and insect repellent according to claim 1, characterized in that: The mass ratio of the polyformaldehyde:acetone monomer:polyetheramine:acetyl chloride is (0.14-0.2):(2.5-3):2:(0.05-0.06); the concentration of the acetyl chloride solution is 1-1.05wt%.

5. The method for preparing a wood preservative and insect repellent according to claim 1, characterized in that: The mass ratio of the paraformaldehyde: acetone monomer: m-aminophenylacetylene is 1: (1.9-2.1): (1.95-2); the mass ratio of the benzyl azide: cuprous iodide: intermediate is (2.2-2.5): 0.01: (5-6).

6. The method for preparing a wood preservative and insect repellent according to claim 1, characterized in that: The raw materials of each component in the wood preservative and insect repellent are, by mass, 45-50 parts of preservative, 500-600 parts of tetrahydrofuran, 15-30 parts of active agent, 10-20 parts of modified chelating agent, 5-10 parts of insecticide and 200-300 parts of water.

7. A wood preservative and insect repellent prepared according to the method for preparing a wood preservative and insect repellent according to any one of claims 1 to 6.

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