Degradable insect trapping plate and preparation method thereof

Abstract

The invention relates to the technical field of polymer compositions, and particularly discloses a degradable insect trapping board and a preparation method thereof, the degradable insect trapping board comprises the following components by weight: 20-30 parts of modified polylactic acid, 30-40 parts of modified poly (butylene succinate), 5-8 parts of an ultraviolet light absorber, 3-5 parts of a pigment, and 5-6 parts of an auxiliary agent; the modified polylactic acid is obtained by blending and modifying polylactic acid, curcumin and polyvinyl alcohol; the modified poly (butylene succinate) is obtained by blending and modifying poly (butylene succinate), curcumin and polyvinyl alcohol. The modified polylactic acid and the modified poly (butylene succinate) have blocking performance on ultraviolet rays, the modified polylactic acid and the modified poly (butylene succinate) have high hydrophobicity and high hydrolysis resistance, the stability of the color of the insect trapping plate is enhanced from the two aspects of improving the ultraviolet resistance and the hydrolysis resistance, and the insect trapping plate has the advantages of being good in anti-ultraviolet and anti-hydrolysis performance, good in anti-ultraviolet and anti-hydrolysis performance, good in anti-ultraviolet and anti-hydrolysis performance, good in anti-ultraviolet and anti-hydrolysis performance and good in anti-ultraviolet and anti-hydrolysis performance. And the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of polymer compositions, and in particular to a degradable insect attractant plate and a preparation method thereof. Background Art

[0002] Soybean-corn strip-compound planting is a planting method that efficiently utilizes land and light and heat resources. At present, there are problems such as unreasonable field configuration, serious soybean lodging, mismatched fertilization technology, difficult prevention and control of pests and diseases, and low mechanization level. Compared with traditional corn and soybean planting, soybean-corn strip-compound planting has higher complexity in the occurrence and spread of pests and diseases due to differences in crop planting cycles and changes in field microclimate.

[0003] At present, the following two control methods are mainly used to deal with the pest problem in the strip-cropped planting of soybeans and corn: 1) Chemical control, that is, during the critical period of pest occurrence, broad-spectrum biocontrol agents and high-efficiency and low-toxic insecticides are used to uniformly control multiple pests for diseases and pests common to corn and soybeans, so as to achieve the goal of preventing multiple pests with one application of pesticides; 2) Physical and chemical control, using the tendency of pests to specific spectra / chromatograms, and developing related physical equipment such as LED insecticidal lamps, degradable color plates, sex attractant devices, etc., to achieve the purpose of attracting and killing pests.

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

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

[0006] The present invention is achieved through the following technical solutions: A degradable insect attractant board comprises 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, 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.

[0007] Polylactic acid (PLA) is a biodegradable polymer material made from renewable resources (such as corn starch) with good transparency, low toxicity and environmental protection properties; 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 in different climatic conditions.

[0008] Therefore, the present invention not only realizes the degradability of the insect attractant board by using the two polymer materials of polylactic acid and polybutylene succinate, but also makes it more suitable for outdoor environment.

[0009] However, if polylactic acid and polybutylene succinate are directly used as these two polymer materials, their ability to resist ultraviolet rays and hydrolysis is relatively poor. Therefore, the present invention adds a certain amount of ultraviolet absorber to the formula to reduce the damage of ultraviolet rays to polylactic acid, polybutylene succinate and pigments.

[0010] However, the applicant discovered through experiments that: Although adding ultraviolet absorbers to the formula can reduce damage to polymer materials to a certain extent through the absorption of ultraviolet rays by the ultraviolet absorbers, the prepared insect attractant boards still cannot maintain their color for a long time. The service life is basically within 3 months, and the color will gradually fade, resulting in the insect attractant boards being unable to attract pests well.

[0011] The invention modifies existing polylactic acid and polybutylene succinate respectively, and both of them are modified by blending with curcumin and polyvinyl alcohol to obtain modified polylactic acid and modified polybutylene succinate respectively; wherein curcumin is a common food additive and a natural pigment; the modified polylactic acid and modified polybutylene succinate modified by curcumin not only have a certain ultraviolet barrier performance, but also can improve the hydrophobicity of the modified polylactic acid and modified polybutylene succinate, that is, compared with the insect attracting board prepared by the combination of the modified polylactic acid and the modified polybutylene succinate, the insect attracting board prepared by the combination of the modified polylactic acid and the modified polybutylene succinate can improve the anti-ultraviolet and anti-hydrolysis capabilities of the insect attracting board, maintain the color stability, and thus improve the service life.

[0012] In a preferred embodiment, the ultraviolet absorber is fluorine-modified benzotriazole; the modification process of 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.

[0013] Benzotriazole is a common ultraviolet absorber. It can absorb ultraviolet rays when directly added to the formula, but its effect needs to be further improved. The fluorine-modified benzotriazole used in the present invention has improved ultraviolet absorption ability compared with benzotriazole. The reason may be that through the above-mentioned modification process, the hydrogen atom (H) on the benzene ring in benzotriazole is replaced by a fluorine atom (F). The fluorine atom can enhance the electron attraction effect in the benzotriazole structure, thereby improving the molecule's ability to absorb ultraviolet rays and helping to improve the stability of benzotriazole.

[0014] In a preferred embodiment, the modification process of the modified polylactic acid is: 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 hours, and then curcumin is added to the mixed solution, magnetically stirred for 30-60 minutes, and then homogenized, dried and crushed in sequence to obtain modified polylactic acid.

[0015] 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% W / V.

[0016] Wherein, the solvent includes chloroform or dichloromethane.

[0017] In a preferred embodiment, the modification process of modified polybutylene succinate is: Add polybutylene succinate and polyvinyl alcohol into an organic solvent to obtain a mixed solution, stir the mixed solution magnetically for 5-10 hours, then add curcumin into the mixed solution, stir the mixed solution magnetically for 30-60 minutes, and then perform homogenization, drying and pulverization treatments in sequence to obtain modified polybutylene succinate.

[0018] 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% W / V.

[0019] Wherein, the solvent includes chloroform or dichloromethane.

[0020] In a preferred embodiment, nano-silica modified by a silane coupling agent is added during the blending and modification process of modified polylactic acid; nano-silica modified by a silane coupling agent is added during the blending and modification process of modified polybutylene succinate; and nano-silica modified by a silane coupling agent and curcumin are added at the same time during the modification process.

[0021] The invention not only increases the mechanical properties of the polymer material but also improves the ability to resist ultraviolet rays by adding nano silicon dioxide into the plastic. The nano silicon dioxide modified by the silane coupling agent can form a chemical bond between the polymer material (modified polylactic acid or modified polybutylene succinate) and the nano silicon dioxide, thereby improving the interfacial bonding force between the two. Compared with nano silicon dioxide, the nano silicon dioxide modified by the silane coupling agent has better dispersion performance in the polymer material (modified polylactic acid or modified polybutylene succinate), avoids the aggregation of the nano silicon dioxide, and improves the overall performance of the insect attractant board.

[0022] In a preferred embodiment, the degradable insect attractant board also includes 10-20 parts of glass fiber.

[0023] 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 attractant board can be improved.

[0024] In a preferred embodiment, the degradable insect trap additives include a dispersant, a plasticizer and an antioxidant.

[0025] Specifically, the dispersant includes polyethylene wax; the plasticizer includes at least one of a citric acid ester plasticizer, glycerin and epoxy soybean oil; and the antioxidant includes a phenolic antioxidant.

[0026] A method for preparing a degradable insect attractant comprises the following steps: 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.

[0027] In a preferred embodiment, 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 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.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention adopts curcumin and polyvinyl alcohol to blend and modify polylactic acid and polybutylene succinate, so that the prepared modified polylactic acid and modified polybutylene succinate not only have a certain barrier performance against ultraviolet rays, but also can improve the hydrophobicity of the modified polylactic acid and modified polybutylene succinate; the modified polylactic acid and modified polybutylene succinate are matched with an ultraviolet absorber. On the one hand, the ultraviolet rays entering the insect attracting board are reduced by utilizing the blocking performance of the modified polylactic acid and modified polybutylene succinate against ultraviolet rays. On the other hand, the ultraviolet rays are further reduced by utilizing the absorption effect of the ultraviolet rays by the ultraviolet absorber in the formula to further reduce the damage of ultraviolet rays to the polymer material, thereby ensuring the color stability. 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 attracting board from the two aspects of improving the ultraviolet resistance and hydrolysis resistance, thereby improving its service life.

[0029] 2. The present invention uses fluorine-modified benzotriazole to replace benzotriazole as the ultraviolet absorber, which improves the absorption of ultraviolet rays, thereby improving the anti-ultraviolet ability of the prepared insect attractant board, and further improving the color stability and service life of the insect attractant board. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] 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 is apparent to those of ordinary skill in the art that these specific details do not have to be employed to practice the present invention. In other embodiments, in order to avoid confusing the present invention, known structures, materials or methods are not specifically described. The materials, instruments and reagents used in the following examples, unless otherwise specified, can be obtained from commercial sources. The technical means used in the examples, unless otherwise specified, are conventional means well known to those skilled in the art.

[0032] In order to improve the anti-ultraviolet and anti-hydrolysis capabilities of the existing degradable polymer insect attractant, this embodiment provides a degradable insect attractant, 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.

[0033] 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: 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 hours, and then curcumin is added to the mixed solution, magnetically stirred for 30-60 minutes, and then homogenized (homogenized by a homogenizer at a speed of 12000rpm for 2 minutes), dried and crushed 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% W / V; the solvent includes chloroform or dichloromethane.

[0034] Preferably, nano-silicon dioxide modified with a silane coupling agent is added during the blending modification process of the modified polylactic acid, and the modification process is as follows: 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 hours, and then curcumin and nano-silica modified with a silane coupling agent are added to the mixed solution, and magnetically stirred for 30-60 minutes. The mass ratio of nano-silica modified with a silane coupling agent to polylactic acid is (2-10):100.

[0035] 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: Add polybutylene succinate 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 it magnetically for 30-60 minutes, and then homogenize (homogenize with a homogenizer at a speed of 12000 rpm for 2 minutes), dry and crush 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% W / V; and the solvent includes chloroform or dichloromethane.

[0036] Among them, polylactic acid, polybutylene succinate, polyvinyl alcohol and curcumin were all purchased. The manufacturer of polylactic acid was Bashifu (Shanghai) Biotechnology Co., Ltd.; polybutylene succinate was purchased from Qiyuan (Guangdong) Pharmaceutical Chemical Co., Ltd.; polyvinyl alcohol was purchased from Chengdu Blue Whale Technology Co., Ltd.; and curcumin was purchased from Zhejiang Yicun Biotechnology Co., Ltd.

[0037] Preferably, nano-silica modified with a silane coupling agent is added during the blending modification process of the modified polybutylene succinate, and the modification process is as follows: Polybutylene succinate and polyvinyl alcohol are added to an organic solvent to obtain a mixed solution, and the mixed solution is magnetically stirred for 5-10 hours, and then curcumin and nano-silica modified with a silane coupling agent are added to the mixed solution, and magnetically stirred for 30-60 minutes. The mass ratio of nano-silica modified with a silane coupling agent to polylactic acid is (2-10):100.

[0038] Further preferably, the silane coupling agent is a liquid silane coupling agent, and the liquid silane coupling agent is composed of the following weight percentage components: 20% ethoxysilane, 72% anhydrous ethanol, and 8% purified water. The liquid silane coupling agent is conducive 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: The liquid silane coupling agent and nano-silica were uniformly mixed in a mass ratio of 1:2 and ball-milled for 30 minutes.

[0039] The pigment can induce the color of the pests and can be a yellow pigment. The yellow pigment is a general-purpose PY1 light-fast yellow G pigment purchased from Shanghai Mengdihu Industrial Co., Ltd.

[0040] Among them, additives include dispersants, plasticizers and antioxidants.

[0041] Specifically, the dispersant is polyethylene wax purchased from Wuhan Xindongyi Chemical Co., Ltd.; the plasticizer includes at least one of a citrate plasticizer, glycerol and epoxy soybean oil, and the citrate plasticizer is tributyl citrate or acetyl tri-n-butyl citrate; the antioxidant includes a phenolic antioxidant, specifically 1,1,3-tri(2-methyl-4-hydroxy-5-tert-butylphenyl) butane.

[0042] In a preferred case, in order to further improve the ability of the insect trap to absorb ultraviolet rays, the ultraviolet absorber is fluorine-modified benzotriazole; the modification process of 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. The brand of benzotriazole is RIASORB UV-P.

[0043] In a preferred embodiment, the degradable insect attractant panel further comprises 10-20 parts of glass fiber.

[0044] The modified polylactic acid and modified polybutylene succinate of the present embodiment have ultraviolet blocking properties, 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 the two aspects of improving ultraviolet resistance and hydrolysis resistance, thereby improving its service life; and, the present embodiment uses fluorine-modified benzotriazole to replace benzotriazole as an ultraviolet absorber, which improves the absorption of ultraviolet rays, so that the anti-ultraviolet ability of the prepared insect trap board is improved, and the color stability and service life of the insect trap board are further improved. Therefore, the degradable insect trap board prepared in the present embodiment can be applied to outdoor areas exposed to the sun and rain, and still has strong color stability even in areas with strong ultraviolet rays and rain.

[0045] The method for preparing the above-mentioned degradable insect attractant board comprises the following steps: S1, mixing modified polylactic acid, modified polybutylene succinate, ultraviolet absorber, pigment and additives to obtain a primary mixture; wherein the preparation process of modified polylactic acid and modified polybutylene succinate refers to the above-mentioned modification process; S2, putting the primary mixed material into an extruder for extrusion molding, cooling, and cutting to obtain a degradable insect attractant board substrate; the extruder is specifically 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 die is 300° C.; S3, spraying insect glue on the base material of the degradable insect attractant board to obtain the degradable insect attractant board.

[0046] In order to better illustrate the technical effect of this embodiment, the following specific cases are used for illustration.

[0047] Embodiment 1: A degradable insect trap, comprising the following components in parts by weight: 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.

[0048] Wherein, the ultraviolet absorber is benzotriazole.

[0049] The preparation process of modified polylactic acid is as follows: Polylactic acid and polyvinyl alcohol are added to dichloromethane to obtain a mixed solution, the mixed solution is magnetically stirred for 8 hours, and then curcumin is added to the mixed solution, magnetically stirred for 40 minutes, and then homogenized, dried and crushed in sequence to obtain modified polylactic acid; wherein the mass ratio of polylactic acid, polyvinyl alcohol and dichloromethane is 10:2:500; and the concentration of curcumin in the mixed solution is 0.030% W / V.

[0050] The preparation process of modified polybutylene succinate is as follows: Polybutylene succinate and polyvinyl alcohol are added to dichloromethane to obtain a mixed solution, the mixed solution is magnetically stirred for 8 hours, and then curcumin is added to the mixed solution, magnetically stirred for 30 minutes, and then homogenized, dried and crushed in sequence to obtain modified polybutylene succinate; wherein the mass ratio of polybutylene succinate, polyvinyl alcohol and dichloromethane is 10:3:500; and the concentration of curcumin in the mixed solution is 0.040% W / V.

[0051] Embodiment 2: This embodiment is based on embodiment 1, and the difference from embodiment 1 is that the dosage of each component is different, specifically: A degradable insect trap, comprising the following components in parts by weight: 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.

[0052] Embodiment 3: This embodiment is based on Embodiment 1, and differs from Embodiment 1 in that an equal amount of fluorine-modified benzotriazole is used to replace benzotriazole.

[0053] The modification process of fluorine-modified benzotriazole is as follows: After adding ferric chloride to benzotriazole and mixing well, fluorine gas is introduced and reacted at 180°C for 4 hours. The ferric chloride is used in an amount of 5% based on the weight of benzotriazole.

[0054] Embodiment 4: This embodiment is based on Example 1, and differs from Example 1 in that nano-silica modified with a liquid silane coupling agent is added during the modification process of modified polylactic acid and modified polybutylene succinate, the timing of adding nano-silica modified with a liquid silane coupling agent is the same as that of curcumin, and the mass ratio of nano-silica modified with a liquid silane coupling agent to polylactic acid or polybutylene succinate is 6:100.

[0055] Embodiment 5: This embodiment is based on Example 3, and differs from Example 3 in that nano-silica modified with a liquid silane coupling agent is added during the modification process of modified polylactic acid and modified polybutylene succinate, the timing of adding nano-silica modified with a liquid silane coupling agent is the same as that of curcumin, and the mass ratio of nano-silica modified with a liquid silane coupling agent to polylactic acid or polybutylene succinate is 6:100.

[0056] Embodiment 6: This embodiment is based on the embodiment 3, and the difference from the embodiment 3 is that the degradable insect attractant contains 20 parts of glass fiber. Specifically: A degradable insect trap, comprising the following components in parts by weight: 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.

[0057] Wherein, the ultraviolet absorber is fluorine-modified benzotriazole.

[0058] Comparative Example 1: This comparative example is based on Example 1, and the difference from Example 1 is that: An equal amount of polylactic acid is used to replace the modified polylactic acid, and an equal amount of polybutylene succinate is used to replace the modified polybutylene succinate.

[0059] Comparative Example 2: This comparative example is based on Example 1, and differs from Example 1 in that no ultraviolet absorber is used.

[0060] Comparative Example 3: This comparative example is based on Example 1, and differs from Example 1 in that no ultraviolet absorber is used, and an equal amount of polylactic acid is used to replace the modified polylactic acid, and an equal amount of polybutylene succinate is used to replace the modified polybutylene succinate.

[0061] Comparative Example 4: This comparative example is based on Example 1, and the difference from Example 1 is that the amount of curcumin used in the process of modifying polylactic acid and modifying polybutylene succinate is different. The concentration of curcumin in the mixed solution was 0.010% W / V.

[0062] Degradable insect traps were prepared according to the preparation method of Example 1 to Example 6 and Comparative Example 1 to Comparative Example 4, and the hydrophobicity and UV resistance of the insect traps were tested: 1) The contact angle (water) of the degradable insect traps prepared in each Example and Comparative Example was tested using a dynamic contact angle meter SDC-350; 2) The color difference values ​​of the samples before and after UV irradiation and the samples after irradiation were tested according to GB / T 3979-1997 and GB / T 7921-1997, and the light aging performance was tested by a fluorescent UV lamp exposure test according to GB / T 14522-1993, the light source was a UV-A lamp, and the UV wavelength was 351nm; the average color difference ΔE before and after UV irradiation (5d, 10d, 15d, 20d) was recorded, and the corresponding tensile strength was tested according to GB / T 1040-92. The test results are shown in Tables 1 to 3: Table 1 From the data in Table 1, we can see that: 1) In this embodiment, polylactic acid and polybutylene succinate are modified, and the initial contact angle of the degradable insect attractant board prepared directly using polylactic acid and polybutylene succinate is greatly improved compared with that of the degradable insect attractant board prepared in this embodiment. The contact angle of the degradable insect attractant board prepared in this embodiment is greater than 115°, indicating that the hydrophobicity of the degradable insect attractant board prepared using modified polylactic acid and modified polybutylene succinate is greatly improved, thereby improving the hydrolysis resistance of the degradable insect attractant board.

[0063] 2) In this embodiment, polylactic acid and polybutylene succinate are modified, and the aging resistance of the degradable insect attractant board prepared directly using polylactic acid and polybutylene succinate is improved. The contact angle difference of the degradable insect attractant board prepared in this embodiment after 20 days of UV-A lamp irradiation (the difference between the contact angle after 20 days of UV-A lamp irradiation and the initial contact angle) is significantly lower than that of the degradable insect attractant board prepared in the comparative example.

[0064] Table 2 From the data in Table 2, we can see that: The color difference value ΔE of the degradable insect attractant prepared in this embodiment changes little as the ultraviolet irradiation time increases, especially when fluorine-modified benzotriazole is used as an ultraviolet absorber, the color difference value ΔE changes even less. When fluorine-modified benzotriazole is used as an ultraviolet absorber and nano-silica modified with a liquid silane coupling agent is added during the modification process of modified polylactic acid and modified polybutylene succinate, the change in the color difference value ΔE reaches a minimum.

[0065] Table 3 From the data in Table 3, we can see that: The tensile strength of the degradable insect attractant prepared in this embodiment changes little with the extension of ultraviolet irradiation time, especially when fluorine-modified benzotriazole is used as an ultraviolet absorber, the tensile strength changes even less. When fluorine-modified benzotriazole is used as an ultraviolet absorber and nano-silica modified with a liquid silane coupling agent is added during the modification process of modified polylactic acid and modified polybutylene succinate, the change in tensile strength reaches a minimum.

[0066] In summary, from the data in Tables 1 to 3, we can see that: 1) In the present invention, polylactic acid, polybutylene succinate are blended and modified with curcumin and polyvinyl alcohol to obtain modified polylactic acid and modified polybutylene succinate. The degradable insect attractant board prepared with the modified polylactic acid and modified polybutylene succinate as the base material is not only degradable, but also has greatly improved hydrophobicity and UV resistance compared with the degradable insect attractant board prepared with polylactic acid and polybutylene succinate as the base material.

[0067] 2) Fluorine-modified benzotriazole has better ability to absorb ultraviolet rays than benzotriazole.

[0068] 3) During the modification process of modified polylactic acid and modified polybutylene succinate, nano-silica modified by silane coupling agent is added, and the anti-ultraviolet ability of the degradable insect attractant board is further improved.

[0069] 4) The amount of curcumin used in the process of modified polylactic acid and modified polybutylene succinate has an impact on the UV resistance of the prepared degradable insect attractant. When the amount of curcumin used is small, the UV resistance of the prepared degradable insect attractant decreases.

[0070] 5) When glass fiber is added in the preparation of the degradable insect attractant, the tensile strength of the prepared degradable insect attractant can be improved.

[0071] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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.

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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