Bird repellent based on thiocyanuric acid and preparation method thereof

Abstract

The invention relates to the technical field of bird repelling agents, in particular to a bird repelling agent based on thiocyanuric acid and a preparation method thereof, and the bird repelling agent is prepared from the following raw materials: thiocyanuric acid, modified beta-cyclodextrin, a magnetic powder synergist, a gel matrix, a synergistic aid, a solvent and a surfactant. The invention discloses a bird repellent based on thiocyanuric acid and a preparation method thereof, thiocyanuric acid is included through monoisocyanate modified beta-cyclodextrin, a magnetic powder synergist and a gel matrix are combined to form a'molecular inclusion-magnetic response-gel fixation 'triple-action system, and the problems that an existing bird repellent is short in time efficiency and poor in weather resistance are solved. The release time of the bird repellent is prolonged, the high bird repelling rate is still kept under the conditions of high temperature and rainwater, and the bird repellent is suitable for scenes such as farmlands and electric power facilities and has remarkable technical progress and practical value.

Description

Technical Field

[0001] The present invention relates to the technical field of bird repellents, and in particular to a bird repellent based on thiocyanuric acid and a preparation method thereof. Background Art

[0002] With the strengthening of ecological and environmental protection efforts and the improvement of bird protection awareness, the harm caused by bird activities in farmland, orchards, power facilities, airports and other places is becoming increasingly serious. The existing bird repellent technology has the following technical bottlenecks that need to be solved in practical applications. These problems are reflected in the application of various types of bird repellents: 1. Short-term bird repellency and frequent application required: Traditional chemical bird repellents are difficult to achieve long-term bird repellency due to the rapid volatilization of their active ingredients. For example, bird repellents with methyl anthranilate as the main ingredient are usually only effective for 2-3 months. Even products with sustained-release technology can extend the release time to 4-6 months, but they still need to be reapplied regularly in complex environments. In addition, the repellency retention rate of single-ingredient bird repellents generally drops significantly after 30 days, while the effective period of existing commercially available powdered bird repellents is only 7-15 days, which cannot meet long-term protection needs; 2. Poor weather resistance and insufficient environmental adaptability: Existing bird repellents are easily ineffective under rain, high temperature, or low temperature conditions. For example, gel-type bird repellents in the existing technology lose their active ingredients severely when exposed to water, and the repellency rate drops from 95% to below 81% after 30 days. Some bird repellents also evaporate more slowly at low temperatures, resulting in insufficient odor concentration, while at high temperatures, they evaporate too quickly, increasing costs. Although some biological long-acting slow-release bird repellents in the existing technology have improved weather resistance through gel encapsulation technology, their slow-release performance will still degrade after long-term exposure to ultraviolet rays or extreme temperatures. 3. Significant toxicity and ecological risks: Some bird repellent ingredients pose safety risks. For example, some contain irritants such as allyl isothiocyanate and methrin, which can pose potential risks to birds and the surrounding ecosystem. Most bird repellents also contain toxic substances such as toluene and naphthalene, with an oral LD50 of less than 2000mg / kg in rats. Long-term use can easily lead to soil contamination. Even powdered bird repellents claimed to be "natural" may have irreversible effects on birds' olfactory systems due to their active ingredient, camphor oil. 4. The mechanism of action is single, and birds are easily adapted: Existing bird repellents mostly rely on a single olfactory stimulation, and birds are easily adapted after long-term exposure.

[0003] Therefore, according to the above-mentioned related technologies, it is urgent to develop a bird repellent based on thiocyanuric acid and a preparation method thereof. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to propose a bird repellent based on thiocyanuric acid and a preparation method thereof. For the first time, thiocyanuric acid is used as the core bird repellent ingredient, combined with a sustained-release carrier and a synergistic system to achieve long-term release while improving the bird repellent effect and weather resistance.

[0005] Based on the above objectives, the present invention provides a bird repellent based on thiocyanuric acid and a preparation method thereof.

[0006] A bird repellent based on thiocyanuric acid is prepared from the following raw materials: thiocyanuric acid, modified β-cyclodextrin, magnetic powder synergist, gel matrix, synergist, solvent and surfactant; The modified β-cyclodextrin is obtained by modifying β-cyclodextrin with dodecyl monoisocyanate; The active ingredient of the magnetic powder synergist is neodymium iron boron magnetic powder.

[0007] Preferably, the preparation process of the modified β-cyclodextrin is as follows: Step A1. β-cyclodextrin and N,N-dimethylformamide were mixed, heated in a 50°C water bath in a three-necked flask, and stirred at 500 rpm until completely dissolved to form a β-cyclodextrin solution; Step A2. Dissolve dodecyl monoisocyanate in N,N-dimethylformamide, and add the obtained dodecyl monoisocyanate solution dropwise to the β-cyclodextrin solution within 30 minutes. Maintain the reaction temperature at 40-60°C and stir the reaction for 4-6 hours. A modified carrier is formed by cross-linking the dodecyl monoisocyanate with the hydroxyl group of β-cyclodextrin. After the reaction is completed, filter out the insoluble matter, wash the product with 80°C hot water to remove unreacted β-cyclodextrin, and then wash with acetone to remove residual dodecyl monoisocyanate. Finally, dry at 60°C to obtain modified β-cyclodextrin.

[0008] Preferably, the mass ratio of β-cyclodextrin to N,N-dimethylformamide in step A1 is 4:30-40.

[0009] Preferably, the mass ratio of dodecyl monoisocyanate to β-cyclodextrin in step A2 is 2-5:4; The mass ratio of N,N-dimethylformamide to dodecyl monoisocyanate in step A2 is 4-10:2-5.

[0010] Preferably, the preparation process of the magnetic powder synergist is as follows: NdFeB magnetic powder and ferroferric oxide are weighed in a weight ratio of 1:0.25, placed in a mortar and ground thoroughly to mix evenly, the mixed powder is transferred to an oven, and baked at 150-250°C for 2-3 hours to enhance the magnetic responsiveness and stability of the magnetic powder particles through high-temperature sintering. After baking, the mixture is naturally cooled to room temperature, passed through an 80-100 mesh sieve to remove agglomerated particles, and sealed for storage to prevent moisture absorption to obtain a magnetic powder synergist.

[0011] Preferably, the neodymium iron boron magnetic powder comprises 15%-30% neodymium, 60%-80% iron, and 1%-5% boron.

[0012] Preferably, the preparation process of the NdFeB magnetic powder is as follows: Step B1. Mixing ingredients: Mix neodymium, iron, boron and other metal powders in proportion and vacuum melt them into alloy ingots; Step B2. Crushing and pulverizing: crushing the alloy ingot into micron-sized powder using a jet mill; Step B3. Pressing: Pressing in a magnetic field to orient the magnetic powder particles; Step B4. Sintering and annealing: Sintering at 1000-1100° C. in vacuum, followed by annealing to obtain NdFeB magnetic powder.

[0013] Preferably, the gel matrix is ​​prepared from sodium carboxymethyl cellulose and SAP water-absorbing resin.

[0014] Preferably, the preparation process of the gel matrix is ​​as follows: Sodium carboxymethyl cellulose and SAP water-absorbing resin are weighed in a weight ratio of 1:1, and 3-5 times the weight of ethylene glycol is added and mixed to fully wet the matrix particles. Deionized water is added to the above mixture, wherein the amount of deionized water is 10-15 times the total weight of the gel matrix. The mixture is stirred at a speed of 300-500 r / min at room temperature for 1-2 hours, and then allowed to stand for 12-24 hours to allow the matrix to fully absorb water and swell to form a colloid. After swelling is completed, a homogenizer is used at a speed of 10000-15000 r / min for 5-10 minutes to eliminate lumps in the matrix to obtain a uniform and fine gel matrix, which is set aside to obtain a gel matrix.

[0015] Preferably, the synergist is prepared from urea and ammonium chloride.

[0016] Preferably, the mass ratio of urea to ammonium chloride in the synergist is 1:1.

[0017] Preferably, the solvent is a mixture of ethanol and acetone.

[0018] Preferably, the mass ratio of ethanol to acetone in the solvent is 3:1.

[0019] A method for preparing a bird repellent based on thiocyanuric acid comprises the following steps: Step S1. mixing thiocyanuric acid and modified β-cyclodextrin, and ultrasonically dispersing them at 60°C for 30 minutes to form an inclusion complex; Step S2. baking the magnetic powder synergist at 150° C. for 2 h and then mixing it with the inclusion compound to obtain a mixture; Step S3. dissolving the gel matrix in a solvent, adding a surfactant, kneading the mixture at 80° C. for 2 h, extruding and then magnetizing to obtain a bird repellent based on thiocyanuric acid.

[0020] Preferably, the mass ratio of the thiocyanuric acid, modified β-cyclodextrin, magnetic powder synergist, gel matrix, synergist, solvent and surfactant is 15-25:10-20:5-10:3-8:3-7:20-40:2-5.

[0021] Preferably, the surfactant is Tween-80.

[0022] Beneficial effects of the present invention: The present invention provides a bird repellent based on thiocyanuric acid and a preparation method thereof. The present invention uses thiocyanuric acid as a core bird repellent component for the first time. Its sulfur-containing structure produces a unique odor that stimulates the trigeminal nervous system of birds, and its bird repellent activity is superior to that of traditional methyl anthranilate. In addition, monoisocyanate-modified β-cyclodextrin and a magnetic powder synergist are combined to form a "molecular inclusion-magnetic response sustained release" dual system, which prolongs the release time. Combined with the synergistic effect of the gel matrix and the magnetic powder, the bird repellent maintains a good bird repellent effect even after high temperature or rain erosion, and therefore has broad application prospects. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0024] The sources and properties of some of the raw materials used in the present invention are as follows: Example 1: A method for preparing a bird repellent based on thiocyanuric acid, comprising the following steps: S1. Mix 4 g of β-cyclodextrin with 30 g of N,N-dimethylformamide, heat in a 50°C water bath in a three-necked flask, and stir at 500 rpm until completely dissolved to form a β-cyclodextrin solution; S2. 2 g of dodecyl monoisocyanate was dissolved in 4 g of N,N-dimethylformamide, and the resulting dodecyl monoisocyanate solution was added dropwise to the β-cyclodextrin solution over 30 min. The reaction temperature was maintained at 40°C and stirred for 4 h. A modified carrier was formed by cross-linking the dodecyl monoisocyanate with the hydroxyl group of β-cyclodextrin. After the reaction, the insoluble matter was removed by filtration, and the product was washed with hot water at 80°C to remove unreacted β-cyclodextrin, and then washed with acetone to remove residual dodecyl monoisocyanate. Finally, the product was dried at 60°C to obtain the modified β-cyclodextrin. S3. Weigh NdFeB magnetic powder and ferroferric oxide in a weight ratio of 1:0.25, place in a mortar and grind thoroughly to mix, transfer the mixed powder to an oven, bake at 150 ° C for 2h, enhance the magnetic responsiveness and stability of the magnetic particles by high temperature sintering, and cool naturally to room temperature after baking. Remove agglomerated particles through an 80-100 mesh sieve and seal to prevent moisture absorption to obtain a magnetic powder synergist; S4. Sodium carboxymethyl cellulose and SAP absorbent resin were weighed in a weight ratio of 1:1, and 3 times the weight of ethylene glycol was added to mix to fully wet the matrix particles. Deionized water was added to the mixture, wherein the amount of deionized water was 10 times the total weight of the gel matrix, and stirred at a speed of 300 r / min at room temperature for 1 hour, followed by standing for 12 hours to allow the matrix to fully absorb water and swell to form a colloid. After swelling is complete, a homogenizer was used at a speed of 10,000 r / min for 5 minutes to eliminate lumps in the matrix to obtain a uniform and fine gel matrix, which was set aside to obtain a gel matrix; S5. Urea and ammonium chloride were mixed in a mass ratio of 1:1 to obtain a synergist; S6. ethanol and acetone were mixed in a mass ratio of 3:1 to obtain a solvent; S7. 15 g of thiocyanuric acid was mixed with 10 g of modified β-cyclodextrin and ultrasonically dispersed at 60 ° C for 30 min to form an inclusion complex; S8. 5 g of magnetic powder synergist was baked at 150 ° C for 2 h and mixed with the inclusion compound to obtain a mixture; S9. 3 g of the gel matrix was dissolved in 20 g of a solvent, 2 g of Tween-80 was added, and the mixture was kneaded at 80° C. for 2 h. The mixture was extruded and then magnetized to obtain a bird repellent based on thiocyanuric acid.

[0025] Example 2: A method for preparing a bird repellent based on thiocyanuric acid, comprising the following steps: S1. Mix 4 g of β-cyclodextrin with 34 g of N,N-dimethylformamide, heat in a 50°C water bath in a three-necked flask, and stir at 500 rpm until completely dissolved to form a β-cyclodextrin solution; S2. 3 g of dodecyl monoisocyanate was dissolved in 6 g of N, N-dimethylformamide, and the resulting dodecyl monoisocyanate solution was added dropwise to the β-cyclodextrin solution over 30 min. The reaction temperature was maintained at 45°C and stirred for 4.5 h. A modified carrier was formed by cross-linking the dodecyl monoisocyanate with the hydroxyl group of β-cyclodextrin. After the reaction, the insoluble matter was removed by filtration, and the product was washed with hot water at 80°C to remove unreacted β-cyclodextrin, and then washed with acetone to remove residual dodecyl monoisocyanate. Finally, the modified β-cyclodextrin was dried at 60°C. S3 weighed NdFeB magnetic powder and ferroferric oxide in a weight ratio of 1:0.25, placed in a mortar and thoroughly ground and mixed, the mixed powder was transferred to an oven and baked at 180 ° C for 2.5h, the magnetic responsiveness and stability of the magnetic particles were enhanced by high temperature sintering, and after baking, it was naturally cooled to room temperature, sieved through an 80-100 mesh to remove agglomerated particles, sealed and stored to prevent moisture absorption, to obtain a magnetic powder synergist; S4. Sodium carboxymethyl cellulose and SAP absorbent resin were weighed in a weight ratio of 1:1, and 3-4-4-5 times the weight of ethylene glycol was added to mix and the matrix particles were fully moistened. Deionized water was added to the mixture, wherein the amount of deionized water was 12 times the total weight of the gel matrix, and stirred at a speed of 350 r / min at room temperature for 1.5 h, followed by standing for 16 h to allow the matrix to fully absorb water and swell to form a colloid. After swelling was completed, a homogenizer was used at a speed of 12000 r / min for 7 min to eliminate lumps in the matrix to obtain a uniform and fine gel matrix for standby to obtain a gel matrix; S5. Urea and ammonium chloride were mixed in a mass ratio of 1:1 to obtain a synergist; S6. ethanol and acetone were mixed in a mass ratio of 3:1 to obtain a solvent; S7. 17 g of thiocyanuric acid was mixed with 13 g of modified β-cyclodextrin and ultrasonically dispersed at 60 ° C for 30 min to form an inclusion complex; S8. 7 g of magnetic powder synergist was baked at 150 ° C for 2 h and mixed with the inclusion compound to obtain a mixture; S9. Dissolve 5 g of the gel matrix in 25 g of solvent, add 3 g of Tween-80, and knead the mixture at 80°C for 2 h. Extrusion molding and magnetization are performed to obtain a bird repellent based on thiocyanuric acid.

[0026] Example 3: A method for preparing a bird repellent based on thiocyanuric acid, comprising the following steps: S1. Mix 4 g of β-cyclodextrin with 36 g of N,N-dimethylformamide, heat in a 50°C water bath in a three-necked flask, and stir at 500 rpm until completely dissolved to form a β-cyclodextrin solution; S2. 4 g of dodecyl monoisocyanate was dissolved in 8 g of N, N-dimethylformamide, and the resulting dodecyl monoisocyanate solution was added dropwise to the β-cyclodextrin solution over 30 min. The reaction temperature was maintained at 50 ° C and stirred for 5 h. A modified carrier was formed by cross-linking the dodecyl monoisocyanate with the hydroxyl group of β-cyclodextrin. After the reaction, the insoluble matter was removed by filtration, and the product was washed with hot water at 80 ° C to remove unreacted β-cyclodextrin, and then washed with acetone to remove residual dodecyl monoisocyanate. Finally, the modified β-cyclodextrin was dried at 60 ° C. S3. Weigh NdFeB magnetic powder and ferroferric oxide in a weight ratio of 1:0.25, grind and mix thoroughly in a mortar, transfer the mixed powder to an oven, bake at 220 ° C for 3h, enhance the magnetic responsiveness and stability of the magnetic particles by high temperature sintering, and cool naturally to room temperature after baking. Remove agglomerated particles through an 80-100 mesh sieve and seal to prevent moisture absorption to obtain a magnetic powder synergist. S4. Sodium carboxymethyl cellulose and SAP absorbent resin were weighed in a weight ratio of 1:1, and 4 times the weight of ethylene glycol was added to mix to fully wet the matrix particles. Deionized water was added to the mixture, wherein the amount of deionized water was 14 times the total weight of the gel matrix, and stirred at a speed of 400 r / min at room temperature for 2 h. Then, the mixture was allowed to stand for 20 h to allow the matrix to fully absorb water and swell to form a colloid. After swelling, a homogenizer was used at a speed of 14000 r / min for 9 min to eliminate lumps in the matrix to obtain a uniform and fine gel matrix for standby use to obtain a gel matrix; S5. Urea and ammonium chloride were mixed in a mass ratio of 1:1 to obtain a synergist; S6. ethanol and acetone were mixed in a mass ratio of 3:1 to obtain a solvent; S7. 20 g of thiocyanuric acid was mixed with 16 g of modified β-cyclodextrin and ultrasonically dispersed at 60 ° C for 30 min to form an inclusion complex; S8. 9 g of magnetic powder synergist was baked at 150 ° C for 2 h and mixed with the inclusion compound to obtain a mixture; S9. Dissolve 7 g of the gel matrix in 35 g of solvent, add 4 g of Tween-80, and knead the mixture at 80°C for 2 h. Extrusion molding and magnetization are performed to obtain a bird repellent based on thiocyanuric acid.

[0027] Example 4: A method for preparing a bird repellent based on thiocyanuric acid, comprising the following steps: S1. Mix 4 g of β-cyclodextrin with 40 g of N,N-dimethylformamide, heat in a 50°C water bath in a three-necked flask, and stir at 500 rpm until completely dissolved to form a β-cyclodextrin solution; S2. 5 g of dodecyl monoisocyanate was dissolved in 10 g of N, N-dimethylformamide, and the resulting dodecyl monoisocyanate solution was added dropwise to the β-cyclodextrin solution over 30 min. The reaction temperature was maintained at 60 ° C and stirred for 6 h. A modified carrier was formed by cross-linking the dodecyl monoisocyanate with the hydroxyl group of β-cyclodextrin. After the reaction, the insoluble matter was filtered out and the product was washed with hot water at 80 ° C to remove unreacted β-cyclodextrin, and then washed with acetone to remove residual dodecyl monoisocyanate. Finally, the modified β-cyclodextrin was dried at 60 ° C. S3. Weigh NdFeB magnetic powder and ferroferric oxide in a weight ratio of 1:0.25, grind and mix thoroughly in a mortar, transfer the mixed powder to an oven, bake at 250 ° C for 3h, enhance the magnetic responsiveness and stability of the magnetic particles by high temperature sintering, and cool naturally to room temperature after baking. Remove agglomerated particles through an 80-100 mesh sieve and seal to prevent moisture absorption to obtain a magnetic powder synergist. S4. Sodium carboxymethyl cellulose and SAP absorbent resin were weighed in a weight ratio of 1:1, and 5 times the weight of ethylene glycol was added to mix to fully wet the matrix particles. Deionized water was added to the mixture, wherein the amount of deionized water was 15 times the total weight of the gel matrix, and stirred at a speed of 500 r / min at room temperature for 2 h, followed by standing for 24 h to allow the matrix to fully absorb water and swell to form a colloid. After swelling is complete, a homogenizer was used at a speed of 15000 r / min for 10 min to eliminate lumps in the matrix to obtain a uniform and fine gel matrix, which was set aside to obtain a gel matrix; S5. Urea and ammonium chloride were mixed in a mass ratio of 1:1 to obtain a synergist; S6. ethanol and acetone were mixed in a mass ratio of 3:1 to obtain a solvent; S7. 25 g of thiocyanuric acid was mixed with 20 g of modified β-cyclodextrin and ultrasonically dispersed at 60 ° C for 30 min to form an inclusion complex; S8. 10 g of magnetic powder synergist was baked at 150 ° C for 2 h and mixed with the inclusion compound to obtain a mixture; S9. 8 g of the gel matrix was dissolved in 40 g of a solvent, 5 g of Tween-80 was added, and the mixture was kneaded at 80° C. for 2 h. The mixture was extruded and then magnetized to obtain a bird repellent based on thiocyanuric acid.

[0028] Example 5: The preparation process of a thiocyanuric acid-based bird repellent used as a farmland slow-release bird repellent is as follows: 1. Ratio of core raw materials (parts by weight): Thiocyanuric acid: 15 parts, modified β-cyclodextrin: 10 parts (modified with dodecyl monoisocyanate), magnetic powder synergist: 5 parts (NdFeB magnetic powder: Fe3O4 = 1:0.25), gel matrix: 3 parts (sodium carboxymethyl cellulose: SAP absorbent resin = 1:1), synergist: 3 parts (urea: ammonium chloride = 1:1), solvent: 20 parts (ethanol: acetone = 3:1), surfactant: 2 parts (Tween-80) 2. Key preparation steps: 1. Preparation of modified β-cyclodextrin: Step A1: Mix β-cyclodextrin and N,N-dimethylformamide in a mass ratio of 4:30, heat in a 50°C water bath, and stir at 500 rpm until dissolved; Step A2: dodecyl monoisocyanate and β-cyclodextrin were mixed in a mass ratio of 2:4, dissolved in N,N-dimethylformamide, and then added dropwise to the β-cyclodextrin solution. The mixture was reacted at 40° C. for 4 h, filtered, washed, and dried to obtain a modified carrier.

[0029] 2. Magnetic powder synergist treatment: Mix NdFeB magnetic powder and Fe3O4 in a weight ratio of 1:0.25, bake at 150℃ for 2h, and sieve for later use.

[0030] 3. Preparation of gel matrix: Sodium carboxymethyl cellulose and SAP water-absorbing resin were mixed in a ratio of 1:1, 3 times of ethylene glycol was added for wetting, and then 10 times of deionized water was added for stirring and swelling, and the colloid was obtained after homogenizer treatment.

[0031] 4. Bird repellent molding: S1. Thiocyanuric acid and modified β-cyclodextrin were mixed and ultrasonically dispersed at 60°C for 30 minutes to form an inclusion complex; S2. Mixing the magnetic powder synergist with the inclusion compound; S3. The gel matrix is ​​dissolved in a solvent, Tween-80 is added, and the mixture is kneaded at 80°C for 2 hours. The mixture is extruded and then magnetized.

[0032] Example 6: The preparation process of a thiocyanuric acid-based bird repellent used as a weather-resistant bird repellent for power facilities is as follows: 1. Adjustment of the core raw material ratio (parts by weight): Thiocyanuric acid: 20 parts, modified β-cyclodextrin: 15 parts, magnetic powder synergist: 8 parts (the proportion of NdFeB magnetic powder increased to 30%), gel matrix: 6 parts (the proportion of SAP water-absorbing resin increased by 20%), solvent: 30 parts (toluene replaces part of ethanol to improve weather resistance), surfactant: 4 parts (combination of Span-80 and Tween-80) 2. Targeted process optimization: 1. Magnetic powder treatment enhancement: The baking temperature of the magnetic powder mixture is increased to 180°C and the time is extended to 2.5 hours to enhance the magnetic response stability.

[0033] 2. Weather resistance improvement steps: high temperature kneading: the kneading temperature is 100 ° C, the rotation speed is 100 r / min, and the kneading time is 3 hours to promote the cross-linking of the gel and the magnetic powder; surface magnetization: after extrusion molding, a secondary magnetization treatment is performed, and the magnetic field strength is increased to 3000 gauss to enhance the resistance to ultraviolet aging.

[0034] 3. Molding process adjustment: calendering is used instead of ordinary extrusion to form a porous block structure with a density of 1.2-1.5g / cm³ and a porosity controlled at 30-40%, taking into account both slow-release and rainwater erosion resistance.

[0035] Comparative Example 1: Bird repellents without magnetic powder enhancer: Differences in preparation methods: 1. Step S2 omitted: The magnetic powder synergist was not baked at 150°C and then mixed with the inclusion compound, and the magnetic powder compounding step was directly skipped; 2. Adjustment of the raw material ratio: 15 g thiocyanuric acid, 10 g modified β-cyclodextrin, 3 g gel matrix, 3 g synergist, 20 g solvent, 2 g surfactant (the remaining steps are the same as in Example 1); The results are shown in Table 1 below: Table 1 Performance test results of Example 1 and Comparative Example 1: Data Analysis: The lack of magnetic powder enhancer leads to: The sustained-release system loses its magnetic responsiveness, and the release rate of the active ingredient accelerates by 40%. When the molecular motion intensifies at high temperature, there is a lack of magnetic constraint, and the volatilization of the active ingredient increases by 35%. When washed by rainwater, there is a lack of synergistic fixation between the magnetic powder and the gel matrix, and the ingredient loss rate increases by 50%.

[0036] Comparative Example 2: Ordinary β-cyclodextrin instead of modified β-cyclodextrin: Differences in preparation methods: 1. Carrier replacement: Use unmodified β-cyclodextrin instead of dodecyl monoisocyanate-modified β-cyclodextrin; 2. Modification step omitted: the cross-linking reaction process was omitted and commercially available β-cyclodextrin was directly used; 3. Ratio adjustment: the mass ratio of β-cyclodextrin to thiocyanuric acid is 1:1.5 (the remaining steps are the same as in Example 1); The results are shown in Table 2 below: Table 2 Performance test results of Example 1 and Comparative Example 2: Data Analysis: Disadvantages of unmodified β-cyclodextrin: 1. The lack of a hydrophobic modification layer increases the water solubility of the inclusion compound and makes it easy to dissociate in a humid environment; 2. The hydroxyl groups on the outer surface of the molecular cavity are not protected, and hydrogen bonds with thiocyanuric acid break at high temperatures, resulting in a 47% decrease in stability; 3. The sustained-release rate is uncontrollable, the initial release exceeds the standard by 30%, and the effective concentration in the later stage is insufficient.

[0037] Comparative Example 3: Bird repellent lacking a gel matrix: Differences in preparation methods: 1. Matrix omitted: no sodium carboxymethyl cellulose and SAP absorbent resin added; 2. Process adjustment: Directly dissolve the surfactant in the solvent and then mix it with the mixture, omitting the kneading step; 3. Morphological changes: The final product is a powder rather than a gel-encapsulated structure; The results are shown in Table 3 below: Table 3 Performance test results of Example 1 and Comparative Example 3: Data Analysis: Loss of gel matrix results in: 1. The lack of a fixed three-dimensional network structure increases the loss rate of active ingredients by 67% when washed by rainwater. 2. Under high temperature environment, the colloid protection is lost and the volatilization rate of thiocyanuric acid is accelerated by 50%. 3. The adhesion to the substrate decreases, and in actual use, it needs to be reapplied weekly, and the maintenance cost increases by 3 times.

[0038] Comparative Example 4: Methyl anthranilate replaces thiocyanuric acid: Differences in preparation methods: 1. Core ingredient replacement: using methyl anthranilate instead of thiocyanuric acid; 2. Ratio adjustment: 15g of methyl anthranilate, 10g of modified β-cyclodextrin (the remaining raw materials are the same as those in Example 1); 3. The process remains unchanged: maintain ultrasonic inclusion, magnetic powder compounding and other steps; The results are shown in Table 4 below: Table 4 Performance test results of Example 1 and Comparative Example 4: Data Analysis: Limitations of traditional ingredients: 1. The mechanism of action is single, and birds’ sense of smell adapts 40% faster 2. Toxicity increased by 40%, and ecological risks are higher 3. The inclusion stability with modified β-cyclodextrin is poor, and the sustained release effect is reduced by 62.5% Comparative Example 5: Single sustained-release bird repellent: Differences in preparation methods 1. System simplification: Only the modified β-cyclodextrin inclusion system is used, and the magnetic powder enhancer and gel matrix are removed; 2. Ratio adjustment: 15g thiocyanuric acid, 15g modified β-cyclodextrin, 20g solvent (the rest of the excipients are halved); 3. Process simplification: Omit the steps of magnetic powder baking and gel kneading; The results are shown in Table 5 below: Table 5 Performance test results of Example 1 and Comparative Example 5: Data Analysis: Disadvantages of a single system: 1. Lack of response adjustment of magnetic powder, release rate fluctuates up to 300% under different environments; 2. Without gel protection, the half-life of the active ingredient is shortened by 50% in an environment with humidity >70%; 3. Poor adaptability in multiple scenarios, barely reaching the level of traditional sustained-release agents in dry environments; The results are shown in Table 6 below: Table 6 Performance test results of Example 2-Example 6: The specific process of the above performance test is as follows: 1. Continuous aging test: (1) Standard: According to T / ZNX 020-2021 "Guidelines for Field Efficacy Tests of Pesticides - Test Guidelines for the Efficacy of Bird Repellents against Bird Pests in Directly Seeded Rice Fields", bird repellents should be able to maintain a stable bird repellent effect for a period of time that meets the specified indicators in actual application scenarios.

[0039] (2) Method: A 10-mu farmland was selected as the test field. The bird repellent of Example 1 was evenly applied to 50 wooden stakes inserted in the field, with the stakes spaced 5 meters apart. Simultaneously, the same number of stakes were set up in the control area and coated with the comparative example bird repellent. The number and duration of bird visits were observed and recorded daily. The failure criterion was when the bird repellent effect dropped below 80% of the initial effect. The time from application to failure was calculated.

[0040] 2. High temperature stability test (90℃ / 24h): (1) Standard: Refer to GB / T 19136-2003 "Determination of thermal storage stability of pesticides". After being placed in a high temperature environment of 90℃ for 24 hours, the composition, content and bird repellent activity of the bird repellent should remain relatively stable.

[0041] (2) Method: 10 g of the bird repellent sample of Example 1 was placed in a high-temperature resistant container, placed in a thermostat set at 90°C, and removed after 24 hours. The composition changes were analyzed using gas chromatography-mass spectrometry (GC-MS), and the content of major components such as thiocyanuric acid was determined using high-performance liquid chromatography (HPLC). The bird repellent activity was then tested by simulating bird behavior. The data before and after treatment were compared, and the degradation rate of the active ingredient and the attenuation ratio of the bird repellent activity were calculated.

[0042] 3. Rain resistance test: (1) Standard: Simulate actual rainfall conditions to test the ability of bird repellents to maintain their bird repellent effect after being washed away by rainwater, and require that the degree of attenuation of the bird repellent effect be within an acceptable range.

[0043] (2) Methods: A 5-square-meter rain shelter was built in the experimental field. An automatic sprinkler was installed inside the shelter to simulate moderate rain with a rainfall of 50 mm / h for 1 hour. Before and after spraying, the proximity of birds to the treated area and the control area was compared. Video recording combined with manual statistics was used to calculate the change in the bird repellent effect. At the same time, samples of the bird repellent after treatment were collected and analyzed for changes in their composition and content to evaluate the impact of rainwater on the erosion of the bird repellent.

[0044] 4. Repellent retention rate test: (1) Standard: Refer to T / ZNX 019-2021 "Guidelines for Test of Bird Repellent Activity - Cage Feeding Method". Bird repellents should be able to maintain a high repellent effect on target birds, and the repellent retention rate must meet a certain value within the specified time.

[0045] (2) Method: 50 common sparrows were placed in a semi-open birdcage with an area of ​​20 square meters as test subjects. The bird repellent of Example 1 was evenly applied to the edges of 10 feeding troughs in the birdcage, and the bird repellent of the control example was applied to the feeding troughs in the control area. Equal amounts of palatable food were placed in the feeding troughs. The birds' feeding behavior at different feeding troughs was observed and recorded within 1 hour. The repellent retention rate was calculated as (1-number of birds feeding at the feeding troughs in the treatment area / number of birds feeding at the feeding troughs in the control area) × 100%. The test was repeated every 7 days for 8 weeks, and the changes in the repellent retention rate at different time periods were recorded.

[0046] The present invention adopts innovative ingredients: the sulfur-containing heterocyclic structure of thiocyanuric acid provides unique biological irritation, and its bird repellent activity is increased by 29.3% compared with methyl anthranilate, and its toxicity is reduced by 40%.

[0047] The present invention achieves a system breakthrough: through the triple mechanism of "modified cyclodextrin inclusion-magnetic powder response-gel fixation", it solves the contradiction of "single sustained release-environmental sensitivity" in the existing technology and achieves a dual improvement in weather resistance and long-term effectiveness.

[0048] The technical solution provided by the present invention can be expanded in application areas: the differentiated process design of farmland type (8-month aging) and power weathering type (3-year stability) can meet the needs of different scenarios, and the adaptability is improved by 35% compared with existing general-purpose products.

[0049] The bird repellent provided by the present invention has long-lasting effect and can achieve continuous bird repelling for 9-9.5 months, which is more than three times that of traditional products (2-3 months), greatly reducing the frequency of spraying.

[0050] The bird repellent provided by the present invention has weather resistance: it can still maintain an effect of more than 85% under conditions of high temperature of 90°C and rain of 50 mm / h, and is suitable for extreme climate areas.

[0051] The bird repellent provided by the present invention is safe: the acute toxicity LD50 is greater than 2000 mg / kg, which is a low toxicity level, and the ecological risk is reduced by 40% compared with the bird repellent containing allyl isothiocyanate.

[0052] The bird repellent provided by the present invention is economical: the electric weather-resistant type is maintenance-free for three years through secondary magnetization and anti-ultraviolet coating, and the overall cost is reduced by 50% compared with existing products.

[0053] In summary, the present invention successfully constructs a long-acting, weather-resistant, low-toxic bird repellent system through multi-component synergy and process optimization, and the technical solution has significant creativity and practical value.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0055] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bird repellent based on thiocyanuric acid, characterized in that: The invention is prepared from the following raw materials: thiocyanuric acid, modified beta-cyclodextrin, magnetic powder synergist, gel matrix, synergist, solvent and surfactant; The modified β-cyclodextrin is obtained by modifying β-cyclodextrin with dodecyl monoisocyanate; The active ingredient of the magnetic powder synergist is neodymium iron boron magnetic powder.

2. The bird repellent based on thiocyanuric acid according to claim 1, characterized in that The preparation process of the modified β-cyclodextrin is as follows: Step A1. β-cyclodextrin and N,N-dimethylformamide were mixed, heated in a 50°C water bath in a three-necked flask, and stirred at 500 rpm until completely dissolved to form a β-cyclodextrin solution; Step A2. Dissolve dodecyl monoisocyanate in N,N-dimethylformamide, and add the resulting dodecyl monoisocyanate solution dropwise to the β-cyclodextrin solution within 30 minutes. Maintain the reaction temperature at 40-60°C and stir for 4-6 hours. After the reaction is completed, filter and wash the product with 80°C hot water to remove unreacted β-cyclodextrin, then wash with acetone to remove residual dodecyl monoisocyanate, and finally dry at 60°C to obtain modified β-cyclodextrin.

3. The bird repellent based on thiocyanuric acid according to claim 2, characterized in that The mass ratio of β-cyclodextrin to N,N-dimethylformamide in step A1 is 4:30-40.

4. The bird repellent based on thiocyanuric acid according to claim 2, characterized in that The mass ratio of dodecyl monoisocyanate to β-cyclodextrin in step A2 is 2-5:4; The mass ratio of N,N-dimethylformamide to dodecyl monoisocyanate in step A2 is 4-10:2-5.

5. The bird repellent based on thiocyanuric acid according to claim 1, characterized in that The gel matrix is ​​prepared from sodium carboxymethyl cellulose and SAP water-absorbing resin.

6. The bird repellent based on thiocyanuric acid according to claim 1, characterized in that The synergistic agent is prepared from urea and ammonium chloride.

7. The bird repellent based on thiocyanuric acid according to claim 1, characterized in that The solvent is a mixture of ethanol and acetone.

8. A method for preparing a bird repellent based on thiocyanuric acid, characterized in that: The following steps are involved: Step S1. mixing thiocyanuric acid and modified β-cyclodextrin, and ultrasonically dispersing them at 60°C for 30 minutes to form an inclusion complex; Step S2. baking the magnetic powder synergist at 150° C. for 2 h and then mixing it with the inclusion compound to obtain a mixture; Step S3. dissolving the gel matrix in a solvent, adding a surfactant, kneading the mixture at 80° C. for 2 h, extruding and then magnetizing to obtain a bird repellent based on thiocyanuric acid.

9. The method for preparing a bird repellent based on thiocyanuric acid according to claim 8, characterized in that: The mass ratio of the thiocyanuric acid, modified beta-cyclodextrin, magnetic powder synergist, gel matrix, synergist, solvent and surfactant is 15-25:10-20:5-10:3-8:3-7:20-40:2-5.

10. The method for preparing a bird repellent based on thiocyanuric acid according to claim 8, characterized in that: The surfactant is Tween-80.

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