Slow-release bird repelling sachet as well as preparation method and application thereof

Abstract

The invention provides a slow-release bird-repelling sachet which comprises a breathable sachet body and slow-release bird-repelling particles filled in the breathable sachet body, and the breathable sachet body has the functions of allowing odor molecules of bird-repelling active ingredients to slowly diffuse and escape, physically blocking leakage of the internal particles, reducing direct flushing of rainwater and improving the bird-repelling effect. The material can be a non-woven fabric, a woven fabric or a microporous membrane with specific air permeability. The slow-release bird-repelling particle is a particle with a core-shell structure, an inner core is formed by loading bird-repelling active ingredients on a porous mineral carrier, a shell is a water-soluble polymer film layer capable of being decomposed by a wet method, hydrophobic particles are embedded in the film layer, and the structural design ensures that the particle is good in mechanical strength in a dry environment, and the active ingredients are released gently; in a humid environment, the shell polymer can swell or gradually disintegrate, and the release behavior is further adjusted.

Description

Technical Field

[0001] This invention belongs to the field of pesticide formulation and plant protection equipment technology, specifically relating to a bird repellent sachet that combines a specific slow-release granule formulation with a suspended application device to achieve enhanced release through mechanical disturbance, as well as its preparation method and uses. Background Technology

[0002] Bird activity is causing increasingly serious damage to orchards, farmland, storage areas, and industrial facilities. Existing bird control technologies mainly include: active application of pesticides (such as spraying and spreading), which suffers from problems such as repetitive labor, terrain limitations, and environmental pollution; physical barriers (such as bird nets), which are costly and affect ventilation and the landscape; sound and light deterrent devices, whose working modes are fixed and birds can easily adapt; and traditional hanging devices (such as medicated cotton balls and naphthalene pellets), which suffer from problems such as unstable release, short duration of effect, and lack of environmental responsiveness.

[0003] Around large industrial facilities such as wind farms and airports, bird control devices require maintenance-free operation, long-lasting effectiveness, and high environmental adaptability. Existing technologies have limitations in these scenarios: active application is too costly; power supply for acoustic and visual equipment is difficult in remote areas; and traditional suspended devices experience rapid performance degradation in variable environments. Therefore, developing a suspended, slow-release bird-repelling device with controllable release, long-lasting effectiveness, maintenance-free operation, and intelligent response to environmental changes is of significant value for bird control in agriculture, forestry, and many other scenarios. Summary of the Invention

[0004] This invention aims to overcome the shortcomings of existing suspended bird-repelling devices, such as uncontrollable release, short duration of effect, poor environmental adaptability, and insufficient applicability to industrial scenarios. It provides a slow-release bird-repelling sachet based on a "disturbance-enhanced release" mechanism. This sachet innovatively combines core-shell structured particles with wet-method disintegration characteristics with a suspended sachet body, achieving intelligent response to environmental wind forces and significantly improving release efficiency and duration of effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a slow-release bird repellent sachet, comprising a breathable sachet and slow-release bird repellent particles filled therein.

[0006] The breathable bladder functions to allow the odor molecules of the bird-repelling active ingredient to slowly diffuse out, while physically preventing the leakage of internal particles and reducing direct erosion by rainwater. Its material can be non-woven fabric, woven fabric, or microporous membrane with specific breathability.

[0007] The slow-release bird-repellent granules are the core of the efficacy of this invention. They are granules with a core-shell structure: the core consists of a porous mineral carrier carrying the bird-repellent active ingredient; the outer shell is a water-soluble polymer film that can be wet-disintegrated, and this film contains hydrophobic microparticles. This structural design ensures that the granules have good mechanical strength in a dry environment and that the release of the active ingredient is gradual; in a humid environment, the outer polymer shell can swell or gradually disintegrate, further regulating the release behavior.

[0008] The key innovative concept of this invention lies in filling the aforementioned particles with slow-release properties into a freely swinging, breathable sac. When the sac is suspended, the particles inside the sac move relative to each other, colliding and rubbing against each other due to environmental disturbances such as natural wind. This continuous mechanical action effectively disturbs and disrupts the static air boundary layer surrounding the particle surface, breaking the equilibrium state of volatile component diffusion, thereby dynamically and significantly enhancing its release rate; when the disturbance stops, the release returns to the basic slow-release state. This active regulation mechanism of "disturbance-enhanced release" allows the sac to achieve efficient spatial diffusion of odor even under light wind conditions, fundamentally overcoming the core defect of insufficient release power in traditional static suspension agents.

[0009] Compared with the prior art, the present invention has the following advantages: 1. High release efficiency and intelligent response: The unique "disturbance-enhanced release" mechanism enables the release intensity of the sachet to be positively correlated with the ambient wind force, achieving intelligent response and improving effectiveness in changing environments.

[0010] 2. Significantly extended duration of effectiveness: The core particles have high drug loading capacity and controllable sustained release characteristics. Combined with the physical protection of the capsule, the effective protection period of a single filling is significantly extended.

[0011] 3. Environmentally friendly and safe to use: It selects natural or highly safe bird-repellent active ingredients, combined with biodegradable capsules and granule coating materials, which are friendly to non-target organisms and the environment.

[0012] 4. Easy to use and highly adaptable: It can be deployed in various complex or hard-to-reach scenarios simply by hanging it, without the need for energy or complicated operation.

[0013] 5. Wide range of applications: This invention is not only applicable to traditional agricultural and forestry fields, but its maintenance-free and long-lasting effects also enable it to effectively meet the special requirements of large industrial facilities such as wind farms, towers, and airports for bird control technology. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The following embodiments are for illustrative purposes only and are not intended to limit the invention.

[0015] Example 1: Preparation of a slow-release bird-repelling sachet 1. Preparation of sustained-release bird repellent granules: 100g of activated attapulgite clay of 100 mesh was used as a porous mineral carrier. Prepare 120 mL of ethanol solution containing 40 g of methyl anthranilate and 20 g of cinnamaldehyde; The solution was loaded onto the carrier for 3 hours at 40°C and -0.08 MPa using a vacuum impregnation method, and then dried at 60°C to constant weight to obtain the drug-loaded core. Preparation of coating solution: Dissolve 10g of polyvinyl alcohol (PVA1788) in 90g of deionized water, add 1.5g of polylactic acid hydrophobic microspheres (particle size 5-10μm), and disperse evenly; A fluidized bed bottom spray coating method was adopted, with the inlet air temperature controlled at 50°C and the spray rate at 5 mL / min. The coating weight was increased to 10%, and core-shell particles with wet-process decomposition characteristics were obtained. Particles with a diameter of 1.5-2.0 mm were screened for later use.

[0016] 2. Sachet Assembly: Capsule: Cut polypropylene nonwoven fabric with a weight of 30g / m², size 15cm×10cm; Filling and sealing: Weigh 30.0g of granules, fold the non-woven fabric in half and heat-press to seal both sides (130°C, 3 seconds), leave an opening at the top for filling and then seal completely; Install the suspension rope: Secure a 40cm nylon rope at the top; The finished product is obtained.

[0017] Example 2: Performance Verification of "Disturbance Enhancement Release" 1. Experimental setup: The sachet from Example 1 was suspended in the center of an environmental wind tunnel, and an electronic nose sensor was placed 50 cm downwind to monitor the concentration of methyl anthranilate (expressed as relative signal intensity).

[0018] 2. Testing process: Record baseline signal strength (set to 100) for 60 minutes in calm wind (0 m / s). The wind speeds were maintained at 0.5 m / s, 1.0 m / s, and 1.5 m / s for 30 minutes each, in turn. Restore calm airflow for 30 minutes.

[0019] 3. Results Data: Wind speed (m / s) Average relative signal strength Enhancement factor compared to baseline 0 100 1.00 0.5 182 1.82 1.0 251 2.51 1.5 315 3.15 Within 15 minutes of calm weather returning, the signal strength returned to baseline levels.

[0020] 4. Conclusion: The release intensity is significantly positively correlated with wind speed, verifying the effectiveness of the "disturbance-enhanced release" mechanism.

[0021] Example 3: Verification of bird deterrence effect in orchards and fields 1. Experimental design: A 2-hectare cherry orchard was divided into two areas, A (experimental group) and B (control group), each with similar conditions, with 1 hectare in each area.

[0022] 2. Handling method: Area A: Hang one sachet on each fruit tree (density ≈ 1 sachet / 12m²), at a height of 2.0-2.5m; Section B: Blank control.

[0023] 3. Observation results: The experiment lasted for 30 days. The average number of birds observed per day in area A was (12.3±3.4) and in area B it was (26.8±5.1). The number of birds observed in area A was 54.1% less than that in area B (P<0.001).

[0024] Fruit damage rate: 8.4% in area A and 30.8% in area B (P<0.001).

[0025] Observation on duration of effectiveness: The protective effect was stable for the first 22 days, indicating that the effective protection period of a single application is about 3 weeks.

[0026] Example 4: Comparative Experiment on the Necessity of the "Disturbance Enhancement" Mechanism Experimental group: The hanging sachet prepared in Example 1.

[0027] Static control group: The same mass of the same slow-release bird repellent granules were filled into capsules of the same material and size, and laid flat and firmly fixed on a rigid support at the bottom of the wind tunnel (so that they could not be moved).

[0028] Test conditions: Two groups of samples were monitored simultaneously for 2 hours under a constant wind speed of 0.5 m / s.

[0029] Results: The average odor signal intensity in the experimental group was 1.82 times that of the calm wind baseline level, while it was only 1.05 times that of the static control group.

[0030] Conclusion: The particle motion caused by the suspension swing is the key to achieving the "disturbance-enhanced release" effect, rather than simply airflow.

[0031] Example 5: Observation on the adaptability of wind farm application scenarios 1. Deployment method: Deploy the sachet of this invention on the vertical axis wind turbine tower.

[0032] 2. Environmental adaptability observation: After a period of operation and observation, the sachet maintained its structural integrity in the variable environment of the wind farm, and the release function did not show significant attenuation, demonstrating good environmental adaptability.

[0033] The slow-release bird-repelling sachet provided by this invention utilizes mature industrial technologies for both core particle preparation and sachet encapsulation, providing a foundation for large-scale production. Field trials and application observations have verified its bird-repelling effect, unique mechanism of action, and environmental adaptability. Therefore, this invention offers a complete technical solution, is easy to implement and promote, and possesses excellent industrial applicability.

Claims

1. A slow-release bird-repelling sachet, characterized in that, include: a) A breathable capsule having an internal containing space; b) Slow-release bird repellent granules filled in the breathable capsule; The slow-release bird-repelling particles are particles with a core-shell structure. The core is composed of a porous mineral carrier and bird-repelling active ingredients loaded thereon, and the shell is a water-soluble polymer film layer containing hydrophobic microparticles that can be wet-disintegrated. The sachet is configured such that by suspending or fixing it in a position of use, the particles within the sachet can be displaced and rub against each other in response to environmental disturbances, thereby continuously disrupting the static boundary layer of the gas phase on the particle surface, resulting in a significantly enhanced release of volatile active ingredients compared to the static state of the particles.

2. The slow-release bird-repelling sachet according to claim 1, characterized in that, The breathable capsule is made of non-woven fabric, woven fabric or microporous membrane material, and its air permeability rate is in the range of 100-500 mL / (cm²•min).

3. The slow-release bird-repelling sachet according to claim 1 or 2, characterized in that, The sustained-release bird repellent granules contain at least two of the following bird repellent active ingredients: methyl anthranilate, cinnamaldehyde, and menthone oxime.

4. The slow-release bird-repelling sachet according to claim 1, characterized in that, The overall particle size of the slow-release bird-repellent granules is 1.0-3.0 mm.

5. The slow-release bird-repelling sachet according to claim 1, characterized in that, The sachet also includes connecting parts for securing it to a support.

6. A method for preparing the slow-release bird-repellent sachet according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Provide sustained-release bird repellent particles, wherein the particles are particles with a core-shell structure, the core of which is composed of a porous mineral carrier and a bird repellent active ingredient loaded thereon, and the outer shell is a water-soluble polymer film layer containing hydrophobic microparticles that can be wet-disintegrated. S2. Provides a breathable bladder; S3. A predetermined amount of the slow-release bird-repellent granules is filled into the breathable sac and sealed to obtain the slow-release bird-repellent sac.

7. Use of the slow-release bird-repelling sachet according to any one of claims 1-5 in repelling birds.

8. The use according to claim 7, characterized in that, The sachet is hung or fixed to the perimeter of fruit trees, garden plants, building eaves, storage areas, wind farm towers, or airport perimeters.