Ultra-low volume liquid for preventing and treating sugarcane borer
By combining polyacrylamide with hydroxypropylated cassava starch as anti-drift agents, the problem of limited anti-drift effect of existing ultra-low capacity liquids is solved, and more efficient target coverage and pollution are achieved.
Patent Information
- Application Number
- CN202510306754.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-15
- Publication Date
- 2025-06-13
AI Technical Summary
The existing ultra-low capacity liquids have limited anti-drift agent effects, resulting in the droplets being susceptible to wind, contaminating non-target areas or sliding off the target.
Polyacrylamide and hydroxypropylated cassava starch are used as anti-drift agents to increase the viscosity of the liquid agent by forming a network structure, thereby reducing drift.
It significantly improves the anti-drift performance of ultra-low capacity liquids, reduces the drift of droplets, and enhances the coverage effect of targets.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of ultra-low volume liquid agents, and particularly relates to an ultra-low volume liquid agent for controlling sugarcane borers. Background Art
[0002] Sugarcane is the main sugar-making cash crop in China and also an important raw material for light industry, chemical industry and energy. Developing the sugarcane industry is of great significance for promoting the development of agriculture and even the entire national economy. In recent years, due to the diversification of crop structures in sugarcane-growing areas, the unreasonable use of chemical pesticides and the reform of farming systems, the types of borers have increased and the damage caused by borers has become more serious, seriously threatening the safety of sugarcane production.
[0003] At present, chemical control is mainly used to control sugarcane borers. However, due to the long-term use of a single pesticide variety, sugarcane borers in some areas have developed varying degrees of drug resistance. Compounding or rotating different pesticide varieties is one of the commonly used and convenient means for controlling the drug resistance of farmland pests. It has been disclosed in the prior art that the compounding of chlorantraniliprole and lufenuron within a certain mass ratio range has an effect on controlling various agricultural pests, which helps to improve the control effect on agricultural pests and can provide ideas for developing agents for controlling sugarcane borers.
[0004] Ultra-low volume liquid agents are a type of high-efficiency pesticide formulation that emerged with the appearance of ultra-low volume spraying equipment. The core lies in extremely low application rates and high concentrations of active ingredients. They can be directly sprayed without dilution, effectively reducing water resource consumption and transportation costs. In addition, the droplets are tiny (usually with a droplet diameter of 50 - 100 μm) and uniform, forming a fine mist cloud through special spraying equipment, covering the crops more evenly, quickly responding to pest infestations, and reducing liquid loss. Thus, it is of great significance to develop a compound combination of chlorantraniliprole and lufenuron into an ultra-low volume liquid agent.
[0005] However, the droplets of ultra-low volume liquid agents are easily affected by wind and drift, polluting non-target areas or slipping off the targets. Therefore, anti-drift agents such as high molecular polymers like polyacrylamide are usually added during the development of ultra-low volume liquid agents. It can increase the viscosity of the spray liquid of ultra-low volume liquid agents, thereby affecting the droplet size, increasing the droplet size, and reducing drift. However, in actual application, using polyacrylamide alone as an anti-drift agent has limited effects. Based on this, it is necessary to improve and optimize the anti-drift agents of ultra-low volume liquid agents. Summary of the Invention
[0006] The purpose of the present invention is to provide an ultra-low volume liquid agent for controlling sugarcane borers, the anti-drift agent of which is compounded by polyacrylamide and hydroxypropylated cassava starch, and can improve the anti-drift performance of the ultra-low volume liquid agent compared with using polyacrylamide alone.
[0007] To achieve the above purpose, the present invention provides the following technical solutions:
[0008] An ultra-low volume liquid agent for controlling sugarcane borers is prepared from the following components by mass percentage: chlorantraniliprole 5-9%, lufenuron 3-7%, surfactant 1-5%, stabilizer 0.3-0.7%, anti-drift agent 0.9-1.8%, and the solvent is supplemented to 100%; wherein, the anti-drift agent is compounded from polyacrylamide and hydroxypropylated cassava starch according to a mass ratio of 1-3:1.
[0009] Further, it is prepared from the following components by mass percentage: chlorantraniliprole 8%, lufenuron 4%, surfactant 3%, stabilizer 0.5%, anti-drift agent 1.3%, and the solvent is supplemented to 100%.
[0010] Further, the surfactant is APG-0814 alkyl glycoside with a carbon chain of C8-C14; the stabilizer is D-α-tocopherol; the solvent is methyl oleate with an acid value of 0.42 mg KOH / g.
[0011] Further, the polyacrylamide is non-ionic polyacrylamide with a molecular weight of 800±500,000.
[0012] Further, the preparation method of the hydroxypropylated cassava starch includes the following steps:
[0013] S1. Place the cassava starch in an oven at 60°C and dry it to a constant weight. Weigh 100 g of the dried cassava starch and add it to a reaction kettle.
[0014] S2. Weigh 15 g of sodium hydroxide and dissolve it in 85 mL of deionized water to prepare a sodium hydroxide solution, and add it to the reaction kettle. Stir at 25°C and 500 rpm for 30 min to form a starch alkali colloid.
[0015] S3. Add 35 g of propylene oxide to the reaction kettle, close the reaction kettle, heat up to 50°C, stir and react at 300 rpm for 12 h, and then add glacial acetic acid to adjust the pH to 7.0.
[0016] S4. Add 3 times the volume of absolute ethanol to the reaction solution, let it stand for 1 h, and precipitate the hydroxypropyl starch.
[0017] S5. Vacuum filter, wash the filter cake 3 times with 80% ethanol, dry it in an oven at 60°C until the moisture content is 8%, crush it and pass it through a 100-mesh sieve to obtain white powdery hydroxypropylated cassava starch.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] The ultra-low volume liquid agent of the present invention uses a compound drift suppressant of polyacrylamide and hydroxypropyl tapioca starch, and its drift suppression rate is better than that of using a single drift suppressant. This may be because the introduction of hydroxypropylated tapioca starch forms a network structure with polyacrylamide, increasing the viscosity of the liquid agent and reducing drift, which is beneficial to solving the problem of limited effect of using polyacrylamide alone, improving the performance of the ultra-low volume liquid agent, and providing support for developing a compound combination of chlorantraniliprole and lufenuron into an ultra-low volume liquid agent. Detailed implementation manners
[0020] The technical solutions of the present invention patent are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.
[0021] 1. Materials and methods
[0022] 1.1 Preparation of hydroxypropylated tapioca starch
[0023] S1. Place tapioca starch in an oven at 60 °C and dry it to a constant weight. After passing through a 100-mesh sieve, weigh 100 g of the dried tapioca starch and add it to the reaction kettle.
[0024] S2. Weigh 15 g of sodium hydroxide, dissolve it in 85 mL of deionized water to prepare a sodium hydroxide solution, add it to the reaction kettle, stir at 25 °C and 500 rpm for 30 min to form a starch alkali colloid.
[0025] S3. Add 35 g of propylene oxide to the reaction kettle, close the reaction kettle, heat up to 50 °C, stir and react at 300 rpm for 12 h, and then add glacial acetic acid to adjust the pH to 7.0.
[0026] S4. Add 3 times the volume of absolute ethanol to the reaction solution, let it stand for 1 h, and precipitate hydroxypropyl starch.
[0027] S5. Vacuum filter, wash the filter cake 3 times with 80% ethanol, dry it in an oven at 60 °C until the moisture content is 8%, crush it and pass it through a 100-mesh sieve to obtain white powdery hydroxypropylated tapioca starch.
[0028] 2. Influence of different components on the performance of the ultra-low volume liquid agent.
[0029] 2.1 Formulation of the ultra-low volume liquid agent
[0030] See Table 1 and Table 2.
[0031] Table 1 Component description
[0032]
[0033] Table 2 Different Ultra-Low-Volume Liquid Formulations (Mass Percentage)
[0034]
[0035] 2.2 Preparation of Ultra-Low-Volume Liquid
[0036] Take the anti-drift agent, mix it evenly and add it to the solvent. Homogenize it by ultrasonic wave at 500W and 40kHz for 30min; then add the technical material to the solvent containing the anti-drift agent, ball mill it until the particle size D90 < 5μm, and filter it through a 5μm filter membrane to obtain the ultra-low-volume liquid.
[0037] 2.3 Determination of the Drift Rate of Ultra-Low-Volume Liquid (Using Wind Tunnel Test)
[0038] Tracer addition: Add sodium fluorescein to the liquid medicine at a ratio of 0.1% and mix it evenly;
[0039] Spraying parameters: Height 1.5m (typical height of sugarcane field), spraying pressure 0.3MPa, nozzle flow rate 0.5L / min (XR11003 nozzle);
[0040] Sampling layout: Lay absorbent paper in the target area (1m×1m), and set collection belts (1m×1m) at 5m, 10m, and 15m downwind of the target area. Lay corresponding absorbent paper in the collection belts;
[0041] Spraying and sampling: Spray for 10m to ensure coverage of the target area. Immediately collect the absorbent paper at all sampling points after spraying, measure the tracer content at each sampling point with a fluorescence spectrophotometer, and calculate the drift rate.
[0042]
[0043] The results are shown in Table 3.
[0044] Table 3 Influence of Different Components on the Drift Rate of Ultra-Low-Volume Liquid
[0045]
[0046] It can be seen from Table 3 that the inverse relationship between the deposition amount in the target area (26.2μg / cm 2 ) and the drift rate (9.2%) verifies that the anti-drift performance of Formulation 6 is the best.
[0047] In summary, the ultra-low-volume liquid using the compound anti-drift agent of polyacrylamide and hydroxypropyl tapioca starch has a better anti-drift rate than that using a single anti-drift agent. This may be because the introduction of hydroxypropylated tapioca starch forms a network structure with polyacrylamide, increases the viscosity of the liquid and reduces the drift, which is beneficial to solving the problem of limited effect of using polyacrylamide alone and improving the performance of the ultra-low-volume liquid.
[0048] 3. Ultra-low volume liquid agent field test (refer to GB / T 17980.61-2004)
[0049] 3.1 Test object: Sugarcane borers
[0050] 3.2 Test agents and spraying methods
[0051] Formula 6 ultra-low volume liquid agent: Ultra-low volume spraying
[0052] 3.3 Test methods
[0053] Each agent is applied to 4 plots, and the plot area is 40m 2 , and a treatment with clear water sprayed is set as the blank control. The total number of plants and the number of dead heart seedlings in each plot are investigated 7 days and 14 days after the agent treatment, and the control effect is calculated (the calculation method adopts the calculation method disclosed in GB / T17980.61-2004), and the results are shown in Table 2.
[0054] Table 2 Field efficacy of the ultra-low volume liquid agent of the present invention
[0055]
[0056] As can be seen from Table 2, the ultra-low volume liquid agent of the present invention has strong quick-acting property, good control effect and long-lasting effect.
[0057] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.
Claims
1. An ultra-low volume liquid for controlling sugarcane borers, characterized in that: The invention is prepared from the following components in percentage by mass: 5-9% of chlorantraniliprole, 3-7% of lufenuron, 1-5% of a surfactant, 0.3-0.7% of a stabilizer, 0.9-1.8% of an anti-drift agent, and the solvent is supplemented to 100%; wherein the anti-drift agent is compounded from polyacrylamide and hydroxypropylated cassava starch in a mass ratio of 1-3:
1.
2. The ultra-low volume liquid for controlling sugarcane borers according to claim 1, characterized in that: The invention is prepared from the following components by mass percentage: 8% of chlorantraniliprole, 4% of lufenuron, 3% of surfactant, 0.5% of stabilizer, 1.3% of anti-drift agent, and the solvent is supplemented to 100%.
3. The ultra-low volume liquid for controlling sugarcane borers according to claim 1, characterized in that: The surfactant is APG-0814 alkyl glycoside with a carbon chain of C8-C14; the stabilizer is D-α-tocopherol; and the solvent is methyl oleate with an acid value of 0.42 mg KOH / g.
4. The ultra-low volume liquid for controlling sugarcane borers according to claim 1, characterized in that: The polyacrylamide is non-ionic polyacrylamide with a molecular weight of 800±500,000.
5. The ultra-low volume liquid according to claim 1, characterized in that: The preparation method of the hydroxypropylated tapioca starch comprises the following steps: S1. Dry the cassava starch in an oven at 60°C to constant weight, weigh 100 g of the dried cassava starch and add it to the reactor; S2. Weigh 15 g of sodium hydroxide and dissolve it in 85 mL of deionized water to prepare a sodium hydroxide solution, add it to the reactor, stir at 25 ° C and 500 rpm for 30 min to form a starch alkali colloid; S3. After adding 35g of propylene oxide to the reactor, the temperature was raised to 50 ° C, the reaction was stirred at 300rpm for 12h, and then glacial acetic acid was added to adjust the pH to 7.0; S4. Add 3 times the volume of anhydrous ethanol to the reaction solution and let it stand for 1 hour to precipitate hydroxypropyl starch; S5. Vacuum filtration, wash the filter cake with 80% ethanol three times, dry it in an oven at 60°C to a moisture content of 8%, and grind it through a 100-mesh sieve to obtain white powdery hydroxypropylated tapioca starch.