A degradable insect-trapping board and its preparation method

Abstract

The present invention relates to the technical field of polymer compositions, and specifically discloses a degradable insect attracting board and a preparation method thereof, comprising the following components in parts by weight: 20-30 parts of modified polylactic acid, 30-40 parts of modified polybutylene succinate, 5-8 parts of ultraviolet absorber, 3-5 parts of pigment, and 5-6 parts of auxiliary agent; the modified polylactic acid is obtained by blending polylactic acid, curcumin and polyvinyl alcohol; the modified polybutylene succinate is obtained by blending polybutylene succinate, curcumin and polyvinyl alcohol. The modified polylactic acid and modified polybutylene succinate of the present invention have a blocking property against ultraviolet rays, and the modified polylactic acid and modified polybutylene succinate have high hydrophobicity and strong hydrolysis resistance. The present invention enhances the color stability of the insect attracting board from two aspects of improving the ultraviolet resistance and hydrolysis resistance, thereby improving its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer compositions, and particularly relates to a degradable insect-trapping board and a preparation method thereof. Background Art

[0002] The strip intercropping of soybean and corn is a planting method for efficiently utilizing land and light and heat resources. At present, there are problems such as unreasonable field configuration, serious lodging of soybeans, mismatched fertilization techniques, difficult prevention and control of diseases, insects and weeds, and low mechanization level. Compared with the traditional pure cropping of corn and soybeans, due to the differences in the planting cycles of crops and the changes in the field microclimate in the strip intercropping of soybean and corn, the occurrence and spread of pests and diseases are more complex.

[0003] At present, for the pest problems in the strip intercropping of soybean and corn, the following two control methods are mainly adopted: 1) Chemical control, that is, during the critical period of pest occurrence, for the common pests and diseases of corn and soybeans, broad-spectrum biocontrol agents and highly efficient and low-toxic insecticides are used to uniformly control various pests, so as to achieve the goal of controlling multiple pests with one application; 2) Physical and chemical trapping and control, using the tropism of pests to specific spectra / chromatograms, and developing related physical devices such as LED insecticidal lamps, degradable color plates, sex pheromone devices, etc., to achieve the purpose of trapping and killing pests.

[0004] In the physical and chemical trapping and control method, the degradable color plate is mainly made of degradable polymers. For example, a cellulose-based biodegradable insect-trapping board and its preparation method disclosed in CN111825958 use PBAT (thermoplastic biodegradable plastic), PLA (polylactic acid) and cellulose as the basic raw materials, and add additives to prepare the insect-trapping board. Although this technology can achieve the degradation of the insect-trapping board, since the insect-trapping board is exposed to sunlight and rain in the outdoor environment for a long time, in order to maintain its long-term insect-trapping effect, it is necessary to reduce the risk of fading caused by sunlight and rain. In addition, CN107099075A discloses an environmentally friendly degradable adhesive board bottom material and its preparation method, which plays a photo-stabilizing role by adding an ultraviolet absorber to protect and weaken the damage of sunlight to the color. However, this technology still needs to be improved in terms of reducing the fading effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a degradable insect-trapping board and a preparation method thereof, so as to improve the ultraviolet resistance and hydrolysis resistance of the insect-trapping board, maintain the color stability, and thus improve its service life.

[0006] The present invention is achieved by the following technical solutions:

[0007] A degradable insect-trapping board comprises the following components in parts by weight:

[0008] 20 - 30 parts of modified polylactic acid, 30 - 40 parts of modified polybutylene succinate, 5 - 8 parts of ultraviolet absorber, 3 - 5 parts of pigment, 5 - 6 parts of auxiliary agent;

[0009] The modified polylactic acid is obtained by blending and modifying polylactic acid, curcumin and polyvinyl alcohol;

[0010] The modified polybutylene succinate is obtained by blending and modifying polybutylene succinate, curcumin and polyvinyl alcohol.

[0011] Polylactic acid (PLA) is a biodegradable polymer material made from renewable resources (such as corn starch), with good transparency, low toxicity and environmental protection characteristics; polybutylene succinate (PBS) is also a common biodegradable polymer material, with strong environmental resistance, especially excellent heat resistance, and can maintain its properties outdoors and under different climatic conditions.

[0012] Therefore, in the present invention, by using these two polymer materials, polylactic acid and polybutylene succinate, not only the degradability of the insect trap board can be achieved, but also it is more suitable for outdoor environments.

[0013] However, if these two polymer materials, polylactic acid and polybutylene succinate, are directly used, the ability to resist ultraviolet rays and hydrolysis is poor. Therefore, in the present invention, a certain amount of ultraviolet absorber is added to the formula to reduce the damage of ultraviolet rays to polylactic acid, polybutylene succinate and pigments.

[0014] However, the applicant found through experiments that:

[0015] By adding an ultraviolet absorber to the formula, although the damage to the polymer material can be reduced to a certain extent through the absorption of ultraviolet rays by the ultraviolet absorber, the prepared insect trap board still cannot maintain its color for a long time, and its service life is basically within 3 months, and the color will gradually fade, resulting in the insect trap board not being able to induce pests well.

[0016] In the present invention, the existing polylactic acid and polybutylene succinate are respectively modified, and the modified polylactic acid and modified polybutylene succinate are respectively obtained by blending and modifying them with curcumin and polyvinyl alcohol; among them, curcumin is a common food additive and a natural pigment. After being modified with curcumin, the modified polylactic acid and modified polybutylene succinate not only have a certain barrier property to ultraviolet rays, but also can improve the hydrophobicity of the modified polylactic acid and modified polybutylene succinate. That is, compared with the insect trap board prepared by using the combination of polylactic acid and polybutylene succinate, the insect trap board prepared by using the combination of modified polylactic acid and modified polybutylene succinate can improve the ultraviolet resistance and hydrolysis resistance of the insect trap board, maintain the stability of its color, and thus improve its service life.

[0017] In a preferred embodiment, the ultraviolet absorber is a fluorine-modified benzotriazole; the modification process of the fluorine-modified benzotriazole is as follows:

[0018] After adding ferric chloride to benzotriazole and mixing evenly, a gaseous fluorination reagent is introduced, and the reaction is carried out at 150 - 180 °C for 3 - 5 h; the gaseous fluorination reagent includes hydrogen fluoride or fluorine gas.

[0019] Benzotriazole is a common ultraviolet absorber. When directly added to the formulation, it can absorb ultraviolet light, but its effect needs to be further improved. The fluorine-modified benzotriazole used in the present invention has an improved ability to absorb ultraviolet light compared to benzotriazole. The reason may be that through the above modification process, the hydrogen atoms (H) on the benzene ring of benzotriazole are replaced by fluorine atoms (F). Fluorine atoms can enhance the electron-withdrawing effect in the benzotriazole structure, thereby improving the molecule's ability to absorb ultraviolet light and contributing to improving the stability of benzotriazole.

[0020] In a preferred embodiment, the modification process of the modified polylactic acid is as follows:

[0021] Polylactic acid and polyvinyl alcohol are added to an organic solvent to obtain a mixed solution. The mixed solution is magnetically stirred for 5 - 10 h, and then curcumin is added to the mixed solution and magnetically stirred for 30 - 60 min. Then, homogenization, drying, and pulverization treatments are carried out in sequence to obtain the modified polylactic acid.

[0022] Among them, the mass ratio of polylactic acid, polyvinyl alcohol, and the organic solvent is 10:(1.5 - 3):(450 - 550); the concentration of curcumin in the mixed solution is 0.025 - 0.060% W / V.

[0023] Among them, the solvent includes chloroform or dichloromethane.

[0024] In a preferred embodiment, the modification process of the modified poly(butylene succinate) is as follows:

[0025] Poly(butylene succinate) and polyvinyl alcohol are added to an organic solvent to obtain a mixed solution. The mixed solution is magnetically stirred for 5 - 10 h, and then curcumin is added to the mixed solution and magnetically stirred for 30 - 60 min. Then, homogenization, drying, and pulverization treatments are carried out in sequence to obtain the modified poly(butylene succinate).

[0026] Among them, the mass ratio of poly(butylene succinate), polyvinyl alcohol, and the organic solvent is 10:(2 - 4):(450 - 550); the concentration of curcumin in the mixed solution is 0.025 - 0.060% W / V.

[0027] Among them, the solvent includes chloroform or dichloromethane.

[0028] In a preferred embodiment, nano-silica modified with a silane coupling agent is added during the blending modification of modified polylactic acid; nano-silica modified with a silane coupling agent is added during the blending modification of modified polybutylene succinate; the timing of adding the nano-silica modified with a silane coupling agent and curcumin is the same during the modification process.

[0029] By adding nano-silica to the plastic, the present invention can not only improve the mechanical properties of the polymer material but also enhance the ability to resist ultraviolet rays; for the nano-silica modified with a silane coupling agent, the silane coupling agent can form a chemical bond between the polymer material (modified polylactic acid or modified polybutylene succinate) and the nano-silica, thereby improving the interfacial adhesion between the two. Moreover, compared with nano-silica, the nano-silica modified with a silane coupling agent has better dispersion performance in the polymer material (modified polylactic acid or modified polybutylene succinate), avoiding the aggregation of nano-silica and improving the overall performance of the insect trap board.

[0030] In a preferred embodiment, the degradable insect trap board further comprises 10 - 20 parts of glass fiber.

[0031] By adding a certain amount of glass fiber to the polymer material (modified polylactic acid and modified polybutylene succinate), the mechanical properties of the degradable insect trap board can be improved.

[0032] In a preferred embodiment, the additives of the degradable insect trap board include a dispersant, a plasticizer, and an antioxidant.

[0033] Specifically, the dispersant includes polyethylene wax; the plasticizer includes at least one of citrate plasticizers, glycerol, and epoxidized soybean oil; the antioxidant includes phenolic antioxidants.

[0034] A preparation method of a degradable insect trap board comprises the following steps:

[0035] S1. Mix modified polylactic acid, modified polybutylene succinate, an ultraviolet absorber, a pigment, and additives to obtain a preliminary mixture.

[0036] S2. Feed the preliminary mixture into an extruder for extrusion molding, cooling, and slitting to obtain a degradable insect trap board substrate.

[0037] S3. Spray an insect sticky glue on the degradable insect trap board substrate to obtain a degradable insect trap board.

[0038] In a preferred embodiment, the modification process of modified polylactic acid is as follows:

[0039] Add polylactic acid and polyvinyl alcohol to an organic solvent to obtain a mixed solution. Magnetically stir the mixed solution for 5 - 10 h, then add curcumin to the mixed solution and magnetically stir for 30 - 60 min. Then, perform homogenization, drying, and pulverization treatments in sequence to obtain modified polylactic acid;

[0040] The modification process of modified polybutylene succinate is as follows:

[0041] Add polybutylene succinate and polyvinyl alcohol to an organic solvent to obtain a mixed solution. Magnetically stir the mixed solution for 5 - 10 h, then add curcumin to the mixed solution and magnetically stir for 30 - 60 min. Then, perform homogenization, drying, and pulverization treatments in sequence to obtain modified polybutylene succinate;

[0042] The ultraviolet absorber is fluorine - modified benzotriazole.

[0043] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0044] 1. By using curcumin and polyvinyl alcohol to blend - modify polylactic acid and polybutylene succinate, the prepared modified polylactic acid and modified polybutylene succinate not only have a certain barrier property to ultraviolet rays, but also can improve the hydrophobicity of modified polylactic acid and modified polybutylene succinate. In cooperation with the ultraviolet absorber, on the one hand, utilize the ultraviolet - blocking property of modified polylactic acid and modified polybutylene succinate to reduce the ultraviolet rays entering the insect - attracting board. On the other hand, utilize the ultraviolet - absorbing effect of the ultraviolet absorber in the formula to further reduce the damage of ultraviolet rays to the polymer material, ensure the color stability, and modified polylactic acid and modified polybutylene succinate have high hydrophobicity and strong hydrolysis resistance. The present invention maintains the color stability of the insect - attracting board from two aspects of improving anti - ultraviolet and anti - hydrolysis abilities, thereby improving its service life.

[0045] 2. The present invention uses fluorine - modified benzotriazole to replace benzotriazole as the ultraviolet absorber, improving the ultraviolet - absorbing ability, making the anti - ultraviolet ability of the prepared insect - attracting board improved, and further improving the color stability and service life of the insect - attracting board. Specific Embodiments

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention. The following described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0047] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those of ordinary skill in the art that the present invention may be practiced without these specific details. In other embodiments, well-known structures, materials, or methods have not been specifically described in order to avoid obscuring the present invention. Materials, instruments, reagents, etc. used in the following examples are commercially available without special instructions. The technical means used in the examples are conventional means well-known to those skilled in the art without special instructions.

[0048] In order to improve the ultraviolet resistance and hydrolysis resistance of the existing degradable polymer insect attracting board, the present embodiment provides a degradable insect attracting board, which comprises the following components in parts by weight:

[0049] 20 - 30 parts of modified polylactic acid, 30 - 40 parts of modified polybutylene succinate, 5 - 8 parts of ultraviolet absorber, 3 - 5 parts of pigment, and 5 - 6 parts of auxiliary agent.

[0050] Among them, the modified polylactic acid is obtained by blending and modifying polylactic acid, curcumin, and polyvinyl alcohol; specifically, the modification process of the modified polylactic acid is as follows:

[0051] Add polylactic acid and polyvinyl alcohol into an organic solvent to obtain a mixed solution. Magnetically stir the mixed solution for 5 - 10 h, then add curcumin into the mixed solution and magnetically stir for 30 - 60 min. Then, perform homogenization (homogenize with a homogenizer at a speed of 12,000 rpm for 2 minutes), drying, and pulverization treatments to obtain the modified polylactic acid; wherein, the mass ratio of polylactic acid, polyvinyl alcohol, and the organic solvent is 10:(1.5 - 3):(450 - 550); the concentration of curcumin in the mixed solution is 0.025 - 0.060% W / V; the solvent includes chloroform or dichloromethane.

[0052] Preferably, nano - silica modified with a silane coupling agent is added during the blending and modification process of the modified polylactic acid, and the modification process is as follows:

[0053] Add polylactic acid and polyvinyl alcohol into an organic solvent to obtain a mixed solution. Magnetically stir the mixed solution for 5 - 10 h, then add curcumin and nano - silica modified with a silane coupling agent into the mixed solution and magnetically stir for 30 - 60 min. The mass ratio of nano - silica modified with a silane coupling agent to polylactic acid is (2 - 10):100.

[0054] Among them, the modified polybutylene succinate is obtained by blending and modifying polybutylene succinate, curcumin, and polyvinyl alcohol. Specifically, the modification process of the modified polybutylene succinate is as follows:

[0055] Add polybutylene succinate and polyvinyl alcohol to an organic solvent to obtain a mixed solution. Magnetically stir the mixed solution for 5 - 10 h, then add curcumin to the mixed solution and magnetically stir for 30 - 60 min. Then, perform homogenization (homogenize with a homogenizer at a speed of 12,000 rpm for 2 minutes), drying, and pulverization treatments to obtain modified polybutylene succinate; wherein, the mass ratio of polybutylene succinate, polyvinyl alcohol, and the organic solvent is 10:(2 - 4):(450 - 550); the concentration of curcumin in the mixed solution is 0.025 - 0.060% W / V;; the solvent includes chloroform or dichloromethane.

[0056] Among them, polylactic acid, polybutylene succinate, polyvinyl alcohol, and curcumin are all obtained by purchase. The manufacturer of polylactic acid is Ba Shifu (Shanghai) Biomedical Technology Co., Ltd.; polybutylene succinate is purchased from Qiyuan (Guangdong) Pharmaceutical and Chemical Co., Ltd.; polyvinyl alcohol is purchased from Chengdu Blue Whale Technology Co., Ltd.; curcumin is purchased from Zhejiang Yicun Biotechnology Co., Ltd.

[0057] Preferably, nano-silica modified with a silane coupling agent is added during the blending modification of the modified polybutylene succinate. The modification process is as follows:

[0058] Add polybutylene succinate and polyvinyl alcohol to an organic solvent to obtain a mixed solution. Magnetically stir the mixed solution for 5 - 10 h, then add curcumin and nano-silica modified with a silane coupling agent to the mixed solution and magnetically stir for 30 - 60 min. The mass ratio of nano-silica modified with a silane coupling agent to polylactic acid is (2 - 10):100.

[0059] Further preferably, the silane coupling agent is a liquid silane coupling agent, and the liquid silane coupling agent is composed of the following components in weight percentage: 20% ethoxysilane, 72% absolute ethanol, and 8% purified water. The liquid silane coupling agent is beneficial to the dispersion of the silane coupling agent in the material nano-silica. The modification process of the nano-silica modified with the silane coupling agent is as follows:

[0060] Mix the liquid silane coupling agent and nano-silica evenly according to a mass ratio of 1:2 and perform ball milling for 30 min to obtain.

[0061] Among them, the pigment can induce the color of pests and can be a yellow pigment. The yellow pigment is a general-purpose PY1 lightfast yellow G pigment purchased from Shanghai Mengdihu Industry Co., Ltd.

[0062] Among them, the additives include a dispersant, a plasticizer, and an antioxidant.

[0063] Specifically, the dispersant is polyethylene wax, purchased from Wuhan Xindongyi Chemical Co., Ltd.; the plasticizer includes at least one of citrate plasticizers, glycerol, and epoxidized soybean oil, and the citrate plasticizer is tributyl citrate or acetyl tributyl citrate; the antioxidant includes phenolic antioxidants, specifically 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0064] In a preferred case, in order to further improve the ability of the insect trap board to absorb ultraviolet rays, the ultraviolet absorber is fluorine-modified benzotriazole; the modification process of fluorine-modified benzotriazole is as follows:

[0065] After adding ferric chloride to benzotriazole and mixing evenly, gaseous fluorination reagent is introduced, and the reaction is carried out at 150-180°C for 3-5 h; the gaseous fluorination reagent includes hydrogen fluoride or fluorine gas. The brand of benzotriazole is RIASORB UV-P.

[0066] In a preferred case, the degradable insect trap board further includes 10-20 parts of glass fiber.

[0067] The modified polylactic acid and modified polybutylene succinate of this embodiment have a blocking property against ultraviolet rays, and the modified polylactic acid and modified polybutylene succinate have high hydrophobicity and strong hydrolysis resistance. The present invention maintains the color stability of the insect trap board from two aspects of improving anti-ultraviolet and anti-hydrolysis abilities, thereby improving its service life; and, this embodiment uses fluorine-modified benzotriazole to replace benzotriazole as the ultraviolet absorber, improving the absorption ability of ultraviolet rays, making the anti-ultraviolet ability of the prepared insect trap board improved, and further improving the color stability and service life of the insect trap board. Therefore, the degradable insect trap board prepared in this embodiment can be applied to the outdoor where it is exposed to sunlight and rain, and still has strong color stability even in areas with strong ultraviolet rays and rain.

[0068] The preparation method of the above-mentioned degradable insect trap board includes the following steps:

[0069] S1. Mix the modified polylactic acid, modified polybutylene succinate, ultraviolet absorber, pigment, and auxiliary agent evenly to obtain a preliminary mixture; among them, the preparation processes of the modified polylactic acid and modified polybutylene succinate refer to the above-mentioned modification processes;

[0070] S2. Feed the preliminary mixture into an extruder for extrusion molding, cooling, and slitting to obtain a degradable insect trap board substrate; the extruder specifically uses a twin-screw extruder, the processing temperature of the twin-screw extruder is 290°C, the main engine speed is 450 rpm, and the vacuum degree is 0.08 MPa; the temperature of the infiltration head is 300°C;

[0071] S3. Spray sticky insect glue on the degradable insect trap board substrate to obtain a degradable insect trap board.

[0072] To better illustrate the technical effects of this embodiment, the following specific cases are used for illustration.

[0073] Example 1:

[0074] A degradable insect trap board is composed of the following components in parts by weight:

[0075] 30 parts of modified polylactic acid, 30 parts of modified polybutylene succinate, 8 parts of ultraviolet absorber, 5 parts of yellow pigment, 2 parts of tributyl citrate, 2 parts of polyethylene wax, and 2 parts of 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0076] Among them, the ultraviolet absorber is benzotriazole.

[0077] The preparation process of the modified polylactic acid is as follows:

[0078] Add polylactic acid and polyvinyl alcohol into dichloromethane to obtain a mixed solution. Stir the mixed solution magnetically for 8 h, then add curcumin into the mixed solution and stir magnetically for 40 min. Then, perform homogenization, drying, and pulverization treatments in sequence to obtain the modified polylactic acid; among them, the mass ratio of polylactic acid, polyvinyl alcohol, and dichloromethane is 10:2:500; the concentration of curcumin in the mixed solution is 0.030% W / V.

[0079] The preparation process of the modified polybutylene succinate is as follows:

[0080] Add polybutylene succinate and polyvinyl alcohol into dichloromethane to obtain a mixed solution. Stir the mixed solution magnetically for 8 h, then add curcumin into the mixed solution and stir magnetically for 30 min. Then, perform homogenization, drying, and pulverization treatments in sequence to obtain the modified polybutylene succinate; among them, the mass ratio of polybutylene succinate, polyvinyl alcohol, and dichloromethane is 10:3:500; the concentration of curcumin in the mixed solution is 0.040% W / V.

[0081] Example 2:

[0082] This example is based on Example 1. The difference from Example 1 is that the dosages of each component are different. Specifically:

[0083] A degradable insect trap board is composed of the following components in parts by weight:

[0084] 20 parts of modified polylactic acid, 40 parts of modified polybutylene succinate, 5 parts of ultraviolet absorber, 5 parts of yellow pigment, 2 parts of tributyl citrate, 2 parts of polyethylene wax, and 2 parts of 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0085] Example 3:

[0086] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that an equal amount of fluorine-modified benzotriazole is used to replace benzotriazole.

[0087] The modification process of the fluorine-modified benzotriazole is as follows:

[0088] After adding ferric chloride to benzotriazole and mixing evenly, fluorine gas is introduced, and the reaction is carried out at 180 °C for 4 h. Based on the weight of benzotriazole, the dosage of ferric chloride is 5%.

[0089] Embodiment 4:

[0090] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that nano-silica modified by a liquid silane coupling agent is added during the modification process of the modified polylactic acid and the modified polybutylene succinate. The addition time of the nano-silica modified by the liquid silane coupling agent is the same as that of curcumin. The mass ratio of the nano-silica modified by the liquid silane coupling agent to the polylactic acid or the polybutylene succinate is 6:100.

[0091] Embodiment 5:

[0092] This embodiment is based on Embodiment 3. The difference from Embodiment 3 is that nano-silica modified by a liquid silane coupling agent is added during the modification process of the modified polylactic acid and the modified polybutylene succinate. The addition time of the nano-silica modified by the liquid silane coupling agent is the same as that of curcumin. The mass ratio of the nano-silica modified by the liquid silane coupling agent to the polylactic acid or the polybutylene succinate is 6:100.

[0093] Embodiment 6:

[0094] This embodiment is based on Embodiment 3. The difference from Embodiment 3 is that the degradable insect trap board contains 20 parts of glass fiber. Specifically:

[0095] A degradable insect trap board is composed of the following components by weight:

[0096] 30 parts of modified polylactic acid, 30 parts of modified polybutylene succinate, 8 parts of ultraviolet absorber, 5 parts of yellow pigment, 20 parts of glass fiber, 2 parts of tributyl citrate, 2 parts of polyethylene wax, and 2 parts of 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0097] Among them, the ultraviolet absorber is fluorine-modified benzotriazole.

[0098] Comparative Example 1:

[0099] This comparative example is based on Embodiment 1. The difference from Embodiment 1 is that:

[0100] Replace the modified polylactic acid with an equal amount of polylactic acid, and replace the modified polybutylene succinate with an equal amount of polybutylene succinate.

[0101] Comparative Example 2:

[0102] This comparative example is based on Example 1, and the difference from Example 1 is that no ultraviolet absorber is used.

[0103] Comparative Example 3:

[0104] This comparative example is based on Example 1, and the difference from Example 1 is that no ultraviolet absorber is used, the modified polylactic acid is replaced with an equal amount of polylactic acid, and the modified polybutylene succinate is replaced with an equal amount of polybutylene succinate.

[0105] Comparative Example 4:

[0106] This comparative example is based on Example 1, and the difference from Example 1 is that the dosage of curcumin is different in the process of modifying polylactic acid and polybutylene succinate.

[0107] The concentration of curcumin in the mixed solution is 0.010% W / V.

[0108] Prepare the biodegradable insecticidal boards from Examples 1 - 6 and Comparative Examples 1 - 4 with reference to the preparation method of the examples, and test the hydrophobicity and anti-ultraviolet properties of the insecticidal boards: 1) Use a dynamic contact angle measuring instrument SDC-350 to measure the contact angle (water) of the biodegradable insecticidal boards prepared in each example and comparative example; 2) According to GB / T 3979-1997 and GB / T 7921-1997, measure the color difference values of the specimens before and after ultraviolet irradiation, and conduct a fluorescent ultraviolet lamp exposure test according to GB / T 14522-1993 to test the light aging performance. The light source is a UV-A lamp, and the ultraviolet wavelength is 351 nm; Record the average color difference ΔE before and after ultraviolet irradiation (5d, 10d, 15d, 20d) and measure the corresponding tensile strength according to GB / T 1040-92. The test results are shown in Tables 1 - 3:

[0109] Table 1

[0110]

[0111] It can be seen from the data in Table 1 that:

[0112] 1) In this embodiment, by modifying polylactic acid and polybutylene succinate, the initial contact angle of the degradable insect trap board prepared directly from polylactic acid and polybutylene succinate is significantly increased. The contact angles of the degradable insect trap boards prepared in this embodiment are all greater than 115°, indicating that the hydrophobicity of the degradable insect trap boards prepared from modified polylactic acid and modified polybutylene succinate is significantly improved, thereby improving the hydrolysis resistance of the degradable insect trap boards.

[0113] 2) In this embodiment, by modifying polylactic acid and polybutylene succinate, the aging resistance of the degradable insect trap board is improved compared to that prepared directly from polylactic acid and polybutylene succinate. The contact angle difference (the difference between the contact angle after 20 days of UV-A lamp irradiation and the initial contact angle) of the degradable insect trap board prepared in this embodiment is significantly lower than that of the degradable insect trap board prepared in the comparative example.

[0114] Table 2

[0115]

[0116] As can be seen from the data in Table 2:

[0117] For the degradable insect trap board prepared in this embodiment, as the ultraviolet irradiation time prolongs, the color difference ΔE changes less. Especially when fluorine-modified benzotriazole is used as the ultraviolet absorber, the change in the color difference ΔE is even smaller. When fluorine-modified benzotriazole is used as the ultraviolet absorber and nano-silica modified with liquid silane coupling agent is added during the modification process of modified polylactic acid and modified polybutylene succinate, the change in the color difference ΔE reaches the minimum value.

[0118] Table 3

[0119]

[0120] As can be seen from the data in Table 3:

[0121] For the degradable insect trap board prepared in this embodiment, as the ultraviolet irradiation time prolongs, the tensile strength changes less. Especially when fluorine-modified benzotriazole is used as the ultraviolet absorber, the change in the tensile strength is even smaller. When fluorine-modified benzotriazole is used as the ultraviolet absorber and nano-silica modified with liquid silane coupling agent is added during the modification process of modified polylactic acid and modified polybutylene succinate, the change in the tensile strength reaches the minimum value.

[0122] In summary, as can be seen from the data in Table 1 - Table 3:

[0123] 1) The present invention blends and modifies polylactic acid, polybutylene succinate, curcumin and polyvinyl alcohol to obtain modified polylactic acid and modified polybutylene succinate. The degradable insect trap board prepared with the modified polylactic acid and modified polybutylene succinate as the base material not only has degradability, but also has greatly improved hydrophobicity and ultraviolet resistance compared with the degradable insect trap board prepared with polylactic acid and polybutylene succinate as the base material.

[0124] 2) Fluorine-modified benzotriazole has better ultraviolet absorption ability than benzotriazole.

[0125] 3) Nanometer silicon dioxide modified by silane coupling agent is added during the modification of modified polylactic acid and modified polybutylene succinate, and the ultraviolet resistance of the degradable insect trap board is further improved.

[0126] 4) The dosage of curcumin in the process of modifying polylactic acid and polybutylene succinate has an impact on the ultraviolet resistance of the degradable insect trap board prepared. When the dosage of curcumin is small, the ultraviolet resistance of the degradable insect trap board prepared decreases.

[0127] 5) When glass fiber is added to the degradable insect trap board prepared, the tensile strength of the degradable insect trap board prepared can be improved.

[0128] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A degradable insect trap, characterized in that: It includes the following components by weight: 20-30 parts of modified polylactic acid, 30-40 parts of modified polybutylene succinate, 5-8 parts of ultraviolet absorber, 3-5 parts of pigment, 5-6 parts of additive; The modified polylactic acid is obtained by blending and modifying polylactic acid, curcumin and polyvinyl alcohol; The modified polybutylene succinate is obtained by blending and modifying polybutylene succinate, curcumin and polyvinyl alcohol; The concentration of the curcumin in the blended and modified mixed solution is 0.025-0.060%.

2. A degradable insect attractant according to claim 1, characterized in that: The ultraviolet absorber is fluorine-modified benzotriazole; the modification process of the fluorine-modified benzotriazole is: After adding ferric chloride to benzotriazole and mixing well, a gaseous fluorination agent is introduced and reacted at 150-180° C. for 3-5 hours; the gaseous fluorination agent includes hydrogen fluoride or fluorine gas.

3. The degradable insect attractant according to claim 1, characterized in that: The modification process of the modified polylactic acid is: Add polylactic acid and polyvinyl alcohol to an organic solvent to obtain a mixed solution, stir the mixed solution magnetically for 5-10 hours, then add curcumin to the mixed solution, stir the mixed solution magnetically for 30-60 minutes, and then homogenize, dry and crush in sequence to obtain modified polylactic acid; wherein the mass ratio of polylactic acid, polyvinyl alcohol and organic solvent is 10: (1.5-3): (450-550); the concentration of curcumin in the mixed solution is 0.025-0.060%; the solvent includes chloroform or dichloromethane.

4. The degradable insect attractant according to claim 1, characterized in that: The modification process of the modified polybutylene succinate is: Add polybutylene succinate and polyvinyl alcohol to an organic solvent to obtain a mixed solution, magnetically stir the mixed solution for 5-10 hours, then add curcumin to the mixed solution, magnetically stir for 30-60 minutes, and then perform homogenization, drying and pulverization in sequence to obtain modified polybutylene succinate; wherein the mass ratio of polybutylene succinate, polyvinyl alcohol and organic solvent is 10:(2-4):(450-550); the concentration of curcumin in the mixed solution is 0.025-0.060%; and the solvent includes chloroform or dichloromethane.

5. The degradable insect attractant according to claim 1, characterized in that: The modified polylactic acid is added with nano-silicon dioxide modified by a silane coupling agent during the blending and modification process; the modified polybutylene succinate is added with nano-silicon dioxide modified by a silane coupling agent during the blending and modification process; the nano-silicon dioxide modified by a silane coupling agent and curcumin are added at the same time during the modification process.

6. The degradable insect attractant according to claim 1, characterized in that: Also includes 10-20 parts of glass fiber.

7. The degradable insect attractant according to claim 1, characterized in that: The auxiliary agents include dispersants, plasticizers and antioxidants.

8. The degradable insect attractant according to claim 7, characterized in that: The dispersant includes polyethylene wax; the plasticizer includes at least one of citric acid ester plasticizer, glycerin and epoxy soybean oil; and the antioxidant includes a phenolic antioxidant.

9. The method for preparing the degradable insect attractant panel according to any one of claims 1 to 8, characterized in that: The steps include: S1, mixing modified polylactic acid, modified polybutylene succinate, ultraviolet absorber, pigment and additives to obtain a primary mixture; S2, putting the primary mixed material into an extruder for extrusion molding, cooling, and cutting to obtain a degradable insect attractant board substrate; S3, spraying insect glue on the base material of the degradable insect attractant board to obtain the degradable insect attractant board.

10. The preparation method according to claim 9, characterized in that: The modification process of the modified polylactic acid is: Adding polylactic acid and polyvinyl alcohol to an organic solvent to obtain a mixed solution, magnetically stirring the mixed solution for 5-10 hours, then adding curcumin to the mixed solution, magnetically stirring for 30-60 minutes, and then sequentially homogenizing, drying and pulverizing to obtain modified polylactic acid; The modification process of the modified polybutylene succinate is: Adding polybutylene succinate and polyvinyl alcohol to an organic solvent to obtain a mixed solution, magnetically stirring the mixed solution for 5-10 hours, then adding curcumin to the mixed solution, magnetically stirring for 30-60 minutes, and then sequentially homogenizing, drying and pulverizing to obtain modified polybutylene succinate; The ultraviolet absorber is fluorine-modified benzotriazole.

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