Application of binary system of dodecyl-β-D-maltoside and glycerol as pesticide adjuvant

Abstract

The present invention belongs to the technical field of pesticides, and specifically relates to the application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant. The present invention uses a binary system of dodecyl-β-D-maltoside and glycerol to increase the amount of pesticide deposited on the surface of plant leaves. The dodecyl-β-D-maltoside / glycerol binary system suppresses the bouncing and splashing of pesticide droplets on the leaves of hydrophobic crops through the rapid diffusion of surfactants, and improves the effective deposition of pesticide droplets on low-concentration super-hydrophobic / hydrophobic leaves; and dodecyl-β-D-maltoside and glycerol both have good biocompatibility and biodegradability, and the mixed system of the two does not change the viscosity of water. In summary, the binary system of dodecyl-β-D-maltoside and glycerol provided by the present invention effectively increases the amount of pesticide droplets deposited on the surface of target plant leaves.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides, and specifically relates to the application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant. Background Art

[0002] In recent years, as people pay more and more attention to the environmental and ecological problems caused by the loss of chemical pesticides, the problem of pesticide droplet deposition on the leaf surface of target plants has been widely studied. Chemical pesticides are indispensable in the prevention and control of plant diseases and insect pests, but only when the pesticide droplets are effectively deposited on the leaf surface of the target plant can they play a role in preventing and controlling diseases, insect pests and weeds. The amount of pesticide deposition refers to the amount of medicine deposited per unit area on the target (crops, harmful organisms, ground, etc., where the pesticide needs to land) after application, expressed in micrograms per square centimeter. When the pesticide formulation is sprayed on the target leaf surface, whether the pesticide droplets can be deposited on the target leaf surface depends on many factors such as the target leaf surface and the properties of the sprayed pesticide liquid. In particular, for target leaf surfaces with hydrophobic properties, it is difficult for pesticide droplets to deposit on the leaf surface of the target plant. Therefore, people adjust the properties of the pesticide liquid to achieve effective deposition of pesticide droplets on the surface of the target leaves.

[0003] The properties of the sprayed pesticide liquid include surface tension, viscosity, and droplet size. Generally speaking, there are two common methods to adjust the properties of pesticide liquid to achieve droplet deposition: one is to add surfactants, and the other is to add polymers. The purpose of adding surfactants to the pesticide liquid is to reduce the surface tension or dynamic surface tension and increase the wetting of the leaf surface by water droplets; adding a small amount of polymers can increase the tensile viscosity of the liquid. However, these two methods still have defects in achieving the deposition of pesticide droplets on the target leaf surface: 1) The addition of surfactants leads to a decrease in surface tension, which usually changes the pesticide particle size distribution, causing droplet drift and evaporation; 2) Polymer adjuvants have poor wettability and large molecular weight, which may change the viscosity of the pesticide liquid and affect the spray effect; 3) The hidden problem of adding surfactants and polymers at the same time is that the amount of chemicals input into the environment has not been reduced. Summary of the invention

[0004] The object of the present invention is to provide an application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant. The binary system of dodecyl-β-D-maltoside and glycerol provided by the present invention inhibits the bouncing and splashing of pesticide droplets through the rapid diffusion of a surfactant, thereby improving the retention and deposition of pesticide droplets on the leaf surface of a target plant, and effectively increasing the deposition amount of pesticide droplets on the leaf surface of the target plant.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The invention provides application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant. The binary system of dodecyl-β-D-maltoside and glycerol is a mixture of dodecyl-β-D-maltoside and glycerol.

[0007] Preferably, the mass ratio of dodecyl-β-D-maltoside to glycerol is (2553-2600):(0.01-0.03).

[0008] Preferably, the application comprises the following steps:

[0009] Dodecyl-β-D-maltoside, glycerol, a pesticide preparation and water are mixed to obtain a diluted mixed solution.

[0010] Preferably, in the diluted mixed liquid, the molar concentration of dodecyl-β-D-maltoside is 5 mmol / L; and the mass percentage content of glycerol is 0.001%.

[0011] Preferably, the pesticide preparation includes thiamethoxam·high-efficiency chlorfenapyr suspension, chlorfenapyr microemulsion, glyphosate soluble solution or chlorfenapyr suspension.

[0012] Preferably, when the pesticide preparation is a 5%wt cyhalothrin microemulsion, the dilution multiple of the diluted mixed solution is 1500 times.

[0013] Preferably, when the pesticide preparation is a 41 wt % glyphosate soluble solution, the dilution multiple of the diluted mixed solution is 150 times.

[0014] Preferably, when the pesticide preparation is a 200 g / L chlorfenapyr suspension, the dilution multiple of the diluted mixed solution is 1000 times.

[0015] Preferably, the spraying speed is ≤3.55 m / s.

[0016] The invention provides an independently packaged pesticide composition, comprising independently packaged pesticide preparations and pesticide adjuvants, wherein the pesticide adjuvants comprise a binary system of dodecyl-β-D-maltoside and glycerol.

[0017] The invention provides a pesticide composition, which comprises a pesticide active component, dodecyl-β-D-maltoside, glycerol and a solvent.

[0018] The present invention provides an application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant, wherein the binary system of dodecyl-β-D-maltoside and glycerol is a mixture of dodecyl-β-D-maltoside and glycerol. In the present invention, both the dodecyl maltoside molecule and the glycerol molecule contain hydroxyl groups, the surfactant dodecyl maltoside itself has hydrogen bonding association between molecules, and the dodecyl maltoside and glycerol are mixed, and the self-association of the dodecyl maltoside is destroyed due to the hydrogen bonding between the dodecyl maltoside and the glycerol molecules, thereby forming a dodecyl maltoside / glycerol complex, and the hydrodynamic radius of the dodecyl maltoside / glycerol complex is smaller than that of the dodecyl maltoside self-association complex, and the diffusion coefficient shows a faster diffusion rate, so the hydration radius of the dodecyl maltoside solution can be reduced and its diffusion rate can be increased. Therefore, the present invention uses a binary system of dodecyl-β-D-maltoside and glycerol to increase the amount of pesticide deposited on the surface of plant leaves. The dodecyl maltoside / glycerol binary system suppresses the bouncing and splashing of pesticide droplets on the leaves of hydrophobic crops through the rapid diffusion of surfactants, and improves the effective deposition of pesticide droplets on low-concentration super-hydrophobic / hydrophobic leaves; and both dodecyl-β-D-maltoside and glycerol have good biocompatibility and biodegradability, and the mixed system of the two does not change the viscosity of water, and the addition of glycerol does not affect the surface tension and dynamic surface tension of dodecyl-β-D-maltoside. In summary, the binary system of dodecyl-β-D-maltoside and glycerol provided by the present invention suppresses the bouncing and splashing of pesticide droplets through the rapid diffusion of surfactants, thereby improving the retention and deposition of pesticide droplets on the leaf surface of target plants, and effectively increasing the deposition of pesticide droplets on the surface of target plant leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The collision and deposition behavior of droplets on the hydrophobic cabbage leaf surface;

[0020] Figure 2 The dynamic surface tension and dynamic collision and deposition behavior of dodecyl maltoside, glycerol and dodecyl maltoside / glycerol binary system;

[0021] Figure 3 The dynamic collision and deposition process of droplets on the surface of green onion;

[0022] Figure 4 The dynamic collision and deposition process of droplets on the surface of citrus leaves;

[0023] Figure 5 The dynamic collision and deposition process of droplets on the surface of weed quinoa leaves;

[0024] Figure 6is the viscosity of an aqueous solution of water, 5 mM dodecyl maltoside, 0.001% glycerol, and a dodecyl maltoside / glycerol binary system;

[0025] Figure 7 The contact angles of droplets of water, 5 mM dodecyl maltoside, 0.001% glycerol, and dodecyl maltoside / glycerol binary systems on cabbage leaves;

[0026] Figure 8 is the diffusion coefficient D of dodecyl maltoside in the dodecyl maltoside / glycerol binary system affected by the concentration of glycerol s and the hydrodynamic radius r H The impact of

[0027] Fig. 9 To enhance the deposition of different pesticide formulation dilutions on different target leaf surfaces by adding a mixed system of dodecyl-β-D-maltoside and glycerol;

[0028] Fig.10 The deposition and distribution of pesticide droplets on the upper, middle and lower leaves of wheat. DETAILED DESCRIPTION

[0029] The invention provides application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant. The binary system of dodecyl-β-D-maltoside and glycerol is a mixture of dodecyl-β-D-maltoside and glycerol.

[0030] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0031] In the present invention, the mass ratio of dodecyl-β-D-maltoside to glycerol is preferably (2553-2600):(0.01-0.03), and more preferably 2553.1:0.01.

[0032] In the present invention, the dodecyl-β-D-maltoside has non-toxicity, extensive foaming activity, biodegradability, bioavailability, biocompatibility, ecological acceptability, high selectivity, and environmental friendliness.

[0033] In the present invention, the application preferably comprises the following steps:

[0034] Dodecyl-β-D-maltoside, glycerol, a pesticide preparation and water are mixed to obtain a diluted mixed solution.

[0035] The invention mixes dodecyl-β-D-maltoside, glycerol, pesticide preparation and water to obtain a diluted mixed liquid.

[0036] In the present invention, in the diluted mixed liquid, the molar concentration of the dodecyl-β-D-maltoside is preferably 5 mmol / L; and the mass percentage content of the glycerol is preferably 0.001%.

[0037] In the present invention, the pesticide preparation preferably includes thiamethoxam·high-efficiency chlorfenapyr suspension concentrate, chlorfenapyr microemulsion, glyphosate soluble solution or chlorfenapyr suspension concentrate.

[0038] In the present invention, when the pesticide preparation is preferably a 5%wt cyhalothrin microemulsion, the dilution multiple of the diluted mixed solution is preferably 1500 times.

[0039] In the present invention, when the pesticide preparation is preferably a 41 wt % glyphosate soluble solution, the dilution multiple of the diluted mixed solution is preferably 150 times.

[0040] In the present invention, the pesticide preparation is preferably a 200 g / L chlorfenapyr suspension; the dilution multiple of the diluted mixed liquid is preferably 1000 times.

[0041] After obtaining the diluted mixed liquid medicine, the present invention preferably sprays the diluted mixed liquid medicine on the surface of plant leaves.

[0042] In the present invention, the spraying speed is ≤3.55 m / s, more preferably 2.62-3.55 m / s.

[0043] The invention provides an independently packaged pesticide composition, comprising independently packaged pesticide preparations and pesticide adjuvants, wherein the pesticide adjuvants comprise a binary system of dodecyl-β-D-maltoside and glycerol.

[0044] The present invention provides a pesticide composition, comprising a pesticide active component, dodecyl-β-D-maltoside, glycerol and a solvent. The present invention has no special requirements on the type of the solvent.

[0045] In order to further illustrate the present invention, the technical solution provided by the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0046] The materials used in the present embodiment include: cabbage (Brassica oleracea L.), quinoa (Chenopodium album L.) and citrus (citrus L.) plants were provided by the Institute of Plant Protection, Chinese Academy of Agricultural Sciences. Welsh onion (Allium fistulosum L.) was purchased from a supermarket. Dodecyl-β-D-maltoside and glycerol with a purity of 99% were purchased from Shanghai MacLean Biochemical Co., Ltd.

[0047] Example 1

[0048] Prepare 0.001% glycerol aqueous solution;

[0049] Prepare a 5 mM aqueous solution of dodecyl maltoside;

[0050] Prepare 0.001% glycerol aqueous solution and 5mM dodecyl maltoside binary system aqueous solution;

[0051] (1) Characterization of plant leaf surfaces. The microstructure of plant leaf surfaces was obtained using a SU8010 scanning electron microscope at 10.0 kV. The contact angle of aqueous solutions on plant leaf surfaces was calculated using a high-speed optical measurement device OCA 20 (DataPhysics Instruments GmbH, Germany).

[0052] (2) Characterization of solution properties. The viscosity values ​​of all aqueous solutions were studied at 25°C using a viscometer DV-III ULTRA programmable rheometer. The dynamic surface tension was measured at a temperature of 25±1°C using an automatic maximum bubble pressure tensiometer (Krüss BP100, Germany). The time window measurement range was 10ms to 100s and the capillary diameter was 0.210mm. The diffusion coefficient was obtained using FT-PGSE nuclear magnetic resonance technology.

[0053] (3) Collision and deposition experiments. A high-speed camera (FASTCAM Mini UX100 Photron) was used to record the dynamic process of droplets impacting the palm leaf surface at a frame rate of 8000fps and a shutter speed of 1 / 20000s. The impact velocity can be changed by modifying the release height of the droplets.

[0054] (4) Results and discussion

[0055] Figure 1 Collision and deposition behavior of droplets on the hydrophobic cabbage leaf surface. Figure 1 Figure a is a photograph of the surface of a cabbage leaf. Figure 1 (b) is a scanning electron microscope (SEM), which reveals the microstructure of the cabbage leaf surface. Figure 1 The c in the figure is the water contact angle, indicating the superhydrophobic property of the cabbage leaf surface. Figure 1 In the figure, d to e show splashing and rebound of water and 0.001% glycerol droplets hitting the surface of cabbage leaves. Figure 1 The droplets f in the figure contain the adjuvant dodecyl maltoside, which partially inhibits the bouncing of the droplets on the cabbage leaf surface, but still splashes or breaks. Figure 1 The g in the mixture is dodecyl maltoside / glycerol, and the droplets can significantly inhibit the bouncing and splashing on the cabbage leaves.

[0056] The collision and deposition of biomass additives on the leaves of super-hydrophobic crops. The present invention uses a binary system consisting of 0.001% glycerol and 5mM dodecyl maltoside, both of which are non-toxic, biocompatible and biodegradable. The collision and deposition behavior of droplets on the surface of cabbage leaves was recorded using a high-speed camera. The surface of cabbage leaves has a micro / nanostructure morphology ( Figure 1 b), the water contact angle is 151.03°( Figure 1 c), indicating that the surface of cabbage leaves is superhydrophobic. Figure 1 Figures d to g show the collision and deposition behavior of droplets of water, 0.001% glycerol, 5 mmol dodecyl maltoside and dodecyl maltoside / glycerol binary system on the surface of cabbage leaves at a speed of 2.62 m / s, with an experimental uncertainty of less than 10%. The diameter of the droplet (D0) is about 2.25 mm ± 0.02 mm. Figure 1 When the water droplet hits the surface of the cabbage leaf, it first reaches the maximum diffusion, then retracts and breaks into many small droplets, and then rebounds. For 0.001% glycerol alone, its dynamic collision and deposition behavior is basically the same as that of water, with the droplet splashing violently and rebounding completely. Figure 1 As shown in Fig. 5, if only dodecyl maltoside is used as an adjuvant, splashing and rebounding are suppressed to a certain extent, but droplet breakup still occurs, leaving several tiny droplets on the surface. In contrast, the water droplets containing dodecyl maltoside / glycerol ( Figure 1 g) completely diffuses onto the surface of the superhydrophobic cabbage leaf after impact and spreads to the maximum area, ultimately achieving and maintaining a large wetting area, even when the impact velocity is as high as 3.55 m / s and at different tilt angles ( Figure 2 ).

[0057] Figure 2 Dynamic surface tension, dynamic collision and deposition behavior of dodecyl maltoside, glycerol and dodecyl maltoside / glycerol binary system. Figure 2 a in FIG is the normalized maximum contact diameter variation with time for dodecyl maltoside, glycerol, and the dodecyl maltoside / glycerol binary system. The droplets containing the dodecyl maltoside / glycerol binary system achieved a large diffusion area on the surface of the cabbage leaf. The droplets of dodecyl maltoside or glycerol spread to the maximum area, then bounced and splashed and bounced off the surface of the cabbage leaf. Figure 2 b is the dynamic surface tension of dodecyl maltoside, glycerol and dodecyl maltoside / glycerol binary system. With the addition of glycerol, the initial and equilibrium surface tensions decreased slightly. Figure 2c is a phase diagram of the dynamic behavior of dodecyl maltoside / glycerol droplets impacting the cabbage leaf surface at different tilt angles. When the concentration of glycerol is higher than 0.001%, the dodecyl maltoside / glycerol mixed system can inhibit the bouncing of droplets on the superhydrophobic surface.

[0058] In order to further characterize and understand the dynamic process of the dodecyl maltoside / glycerol droplet collision with the cabbage leaf surface, the maximum contact diameter D t / D0 normalization processing, where D0 represents the initial radius of the droplet, D t is the contact diffusion diameter. In the falling stage, the present invention ignores the influence of resistance and regards the movement of the droplet as free fall. The moment when the water droplet contacts the cabbage leaf surface is considered as the initial time, 0 milliseconds. Figure 2 It can be seen that all D t / D0 value reaches the maximum value at about 2.0ms, and only the D t / D0 value remains at the maximum value, showing effective deposition ( Figure 2 a). Generally speaking, the addition of surfactants is mainly to reduce the surface tension of aqueous solutions or change the dynamic surface tension to increase the wetting, spreading and deposition of droplets on superhydrophobic surfaces. Here, the addition of glycerol did not change the dynamic surface tension of the surfactant solution ( Figure 2 b). According to the Kelvin-Helmholtz instability, under the condition of constant surface tension, the key to improving stability is the speed of retraction, which requires the droplet to achieve a greater degree of wetting and spreading on the hydrophobic surface and float to the surface in a short time. In the research of the present invention, dodecyl maltoside obtained local pinning ( Figure 1 f), and complete pinning with maximum diffusion was observed for dodecylmaltoside / glycerol ( Figure 1 g in ). Figure 2 As shown in (b), the addition of glycerol did not significantly affect the dynamic surface tension of the dodecyl maltoside solution even at a glycerol concentration of up to 0.01%. Figure 2 Figure c shows that dodecyl maltoside / glycerol aqueous solution can effectively inhibit the bouncing behavior of droplets on super-hydrophobic surfaces at different tilt angles. In addition to inhibiting the bouncing on the surface of cabbage leaves, dodecyl maltoside / glycerol can also effectively inhibit the bouncing and splashing of droplets on other super-hydrophobic / hydrophobic leaf surfaces ( Figure 3-Figure 5 ).

[0059] The impact and deposition of a droplet on a solid surface is a fast dynamic process. It starts with the droplet contacting the solid surface, undergoes diffusion and contraction, and finally deposits or rebounds. The entire dynamic impact process takes less than 5 milliseconds ( Figure 1). Therefore, the dynamic properties of dodecyl maltoside / glycerol play an important role in its high-speed collision and deposition process.

[0060] Figure 3 The dynamic collision and deposition process of droplets on the surface of green onion. Figure 3 Figure a is a photo of the surface of a green onion leaf. Figure 3 (b) Scanning electron microscopy (SEM) reveals the microstructure of the surface of green onion leaves. Figure 3 The c in the figure is the contact angle of the water droplet on the surface of the green onion, which proves the hydrophobic nature of the surface of the green onion leaf. Figure 3 The d in the figure shows the water droplet hitting the surface of the onion leaf and rebounding. Figure 3 The e in it is the dodecyl maltoside / glycerol binary system which can effectively inhibit the bouncing behavior of droplets on the surface of green onions.

[0061] Figure 4 Dynamic collision and deposition process of droplets on the surface of citrus leaves. Figure 4 Figure a is a photograph of the surface of a citrus leaf. Figure 4 (b) Scanning electron microscopy (SEM) reveals the microstructure of the surface of citrus leaves. Figure 4 The c in the figure is the contact angle of the water drop on the surface of the citrus leaf, which proves the hydrophobic nature of the surface of the citrus leaf. Figure 4 The d in the figure shows the water droplet hitting the surface of the citrus leaf and rebounding. Figure 4 The e in it is the dodecyl maltoside / glycerol binary system, which can effectively inhibit the bouncing behavior of droplets on the surface of citrus leaves.

[0062] Figure 5 The dynamic collision and deposition process of droplets on the surface of weed quinoa leaves. Figure 5 Figure a is a photograph of the surface of the weed quinoa leaf. Figure 5 (b) Scanning electron microscopy (SEM) reveals the microscopic structure of the surface of the weed quinoa leaf. Figure 5 The contact angle of the water droplet on the surface of the weed quinoa leaf in c proves the superhydrophobic property of the surface of the weed quinoa leaf. Figure 5 In d, a water droplet hits the surface of a weed quinoa leaf and shows a rebound. Figure 5 The e in it is the dodecyl maltoside / glycerol binary system, which can effectively inhibit the bouncing behavior of droplets on the surface of weed quinoa leaves.

[0063] Study on the mechanism of effective deposition of droplets on cabbage leaves.

[0064] The higher the viscosity of the liquid, the more conducive it is to the effective deposition of droplets on the solid surface. However, for the pesticide spraying process, if the viscosity of the liquid is too high, the spraying equipment cannot be atomized, causing problems such as nozzle clogging. Therefore, during the addition of pesticide tank mix adjuvants, the viscosity of the liquid cannot be increased. In this study, whether it is a single system of dodecyl maltoside and glycerol or a mixed system of the two, its viscosity is similar to that of water, see Figure 6 .

[0065] Figure 6 The viscosity is the viscosity of aqueous solutions of water, 5 mM dodecyl maltoside, 0.001% glycerol, and dodecyl maltoside / glycerol binary system.

[0066] Figure 7 The contact angles of droplets of water, 5 mM dodecyl maltoside, 0.001% glycerol and dodecyl maltoside / glycerol binary system on cabbage leaves.

[0067] Contact angle is an important indicator for evaluating the wetting of liquid on solid surface. Figure 7 The contact angles of 5 mM dodecyl maltoside, 0.001% glycerol, and the dodecyl maltoside / glycerol binary system droplets on the cabbage leaf surface are shown. Figure 7 It can be seen that the contact angle of the water droplet on the cabbage leaf surface is greater than 150°, indicating the superhydrophobic properties of the cabbage leaf surface. When the concentration of glycerol is 0.001% and 0.005%, the contact angle of the mixed system is basically close to the contact angle of 5mM dodecyl maltoside solution on the cabbage leaf surface. Only when the concentration of glycerol is as high as 0.01%, the contact angle drops significantly. The results show that when the concentration of glycerol is 0.001%, glycerol does not change the wetting ability of 5mM dodecyl maltoside on the cabbage leaf surface. The collision and bouncing of droplets on the solid surface is a dynamic deposition process, which is basically completed within 6ms, and there is no significant difference in the viscosity of the dodecyl maltoside / glycerol binary system and the contact angle of the mixed system on the cabbage leaf surface.

[0068] Subsequently, the inventors investigated diffusion-ordered NMR spectroscopy (DOSY), a type of pulsed field gradient NMR spectroscopy that is able to measure the translational diffusion of dissolved molecules. DOSY is a powerful diffusion coefficient tool that can provide direct information on molecular dynamics, including intermolecular interactions. According to the Stokes equation D = k B T / (6πηr H ), where D is the diffusion coefficient, T is the absolute temperature, k B is the Boltzmann constant, η is the viscosity, r H is the hydrodynamic radius. Figure 8is the diffusion coefficient D of dodecyl maltoside in the dodecyl maltoside / glycerol binary system s and the hydrodynamic radius r H The addition of glycerol makes D s Increase, r H reduce. Figure 8 The results show that adding glycerol to the dodecyl maltoside solution can reduce its hydration radius and increase its diffusion rate. Both dodecyl maltoside molecules and glycerol molecules contain hydroxyl groups, and there are strong hydrogen bonds between them. In fact, the surfactant dodecyl maltoside itself also has hydrogen bonding between molecules. Due to the existence of hydrogen bonds between dodecyl maltoside and glycerol molecules, the self-association of dodecyl maltoside will be destroyed to form a dodecyl maltoside / glycerol complex. In this way, the hydrodynamic radius of the dodecyl maltoside / glycerol complex is smaller than that of the dodecyl maltoside self-association complex, and the diffusion coefficient shows a faster diffusion rate (Table 1).

[0069] Figure 8 is the diffusion coefficient D of dodecyl maltoside in the dodecyl maltoside / glycerol binary system affected by the concentration of glycerol s and the hydrodynamic radius r H Impact

[0070] Table 1 Diffusion coefficients of dodecyl maltoside and glycerol mixed systems

[0071]

[0072] Example 2

[0073] 5% high-efficiency cyhalothrin microemulsion, dodecyl-β-D-maltoside, glycerol and water are mixed and diluted 1500 times to obtain a high-efficiency cyhalothrin mixed system containing dodecyl-β-D-maltoside and glycerol;

[0074] 41% glyphosate soluble concentrate, dodecyl-β-D-maltoside, glycerol and water were mixed and diluted 1500 times to obtain a glyphosate miscible system containing dodecyl-β-D-maltoside and glycerol;

[0075] 200 g / L chlorfenapyr suspension, dodecyl-β-D-maltoside, glycerol and water were mixed and diluted 1500 times to obtain a chlorfenapyr mixed system containing dodecyl-β-D-maltoside and glycerol;

[0076] As a control group:

[0077] Mixing 5% high-efficiency cyhalothrin microemulsion with water and diluting it 1500 times to obtain a high-efficiency cyhalothrin mixed system free of dodecyl-β-D-maltoside and glycerol;

[0078] Mixing 41% glyphosate soluble concentrate with water and diluting it 1500 times to obtain a glyphosate miscible system free of dodecyl-β-D-maltoside and glycerol;

[0079] 200 g / L chlorfenapyr suspension was mixed with water and diluted 1500 times to obtain a chlorfenapyr mixed system free of dodecyl-β-D-maltoside and glycerol;

[0080] Fig. 9 The mixed system of dodecyl-β-D-maltoside and glycerol was added to enhance the deposition of different pesticide formulation dilutions on different target leaf surfaces. Fig. 9 A in the figure is the deposition process of spraying 5% highly effective cyhalothrin microemulsion diluted 1500 times (containing / not containing a mixed system of dodecyl-β-D-maltoside and glycerol) on the cabbage leaf surface. Fig. 9 B in the figure is the deposition process of spraying 41% glyphosate soluble solution diluted 150 times (containing / not containing a mixed system of dodecyl-β-D-maltoside and glycerol) on the surface of quinoa leaves. Fig. 9 C in the figure is the deposition process of spraying 200 g / L chlorfenapyr suspension diluted 1000 times (containing / not containing a mixed system of dodecyl-β-D-maltoside and glycerol) on the surface of corn leaves.

[0081] Example 3

[0082] Treatment 1: 22% thiamethoxam·lambda-cyhalothrin (Thi·LC) suspension was mixed with water and diluted to obtain a thiamethoxam·lambda-cyhalothrin (Thi·LC) suspension dilution system, recorded as Thi·LC;

[0083] Treatment 2: 22% thiamethoxam·high-efficiency chlorflucythrin (Thi·LC) suspension, glycerol and water were mixed and diluted to obtain a thiamethoxam·high-efficiency chlorflucythrin (Thi·LC) suspension dilution system containing 0.001% glycerol, recorded as Thi·LC+0.001% glycerol;

[0084] Treatment 3: 22% thiamethoxam·high-efficiency chlorflucythrin (Thi·LC) suspension, dodecyl maltoside and water were mixed and diluted to obtain a thiamethoxam·high-efficiency chlorflucythrin (Thi·LC) suspension dilution system containing 5 mM dodecyl maltoside, recorded as Thi·LC+5 mM dodecyl maltoside;

[0085] Treatment 4: 22% thiamethoxam·high-efficiency chlorflucythrin (Thi·LC) suspension, glycerol, dodecyl maltoside and water were mixed and diluted to obtain a thiamethoxam·high-efficiency chlorflucythrin (Thi·LC) suspension dilution system containing 0.001% glycerol and 5mM dodecyl maltoside, recorded as Thi·LC+5mM dodecyl maltoside+0.001% glycerol;

[0086] In the above treatments, the Thi·LC concentration was 150 g ai / ha;

[0087] The results of spraying wheat plants in treatments 1 to 4 are shown in Table 2 and Fig.10 As shown, the mixed system of dodecyl maltoside and glycerol significantly increased the deposition and distribution of the pesticide solution on the wheat plants.

[0088] Table 2 Deposition of pesticide droplets on the upper, middle and lower leaves of wheat (mL / cm 2 )

[0089]

[0090] In summary, the present invention proposes a green and efficient system to improve the deposition of droplets on low-concentration superhydrophobic / hydrophobic leaves. The dodecyl maltoside / glycerol binary system suppresses the bouncing and splashing of droplets through the rapid diffusion of surfactants, thereby improving retention and deposition. The diffusion and deposition mechanism of surfactant / glycerol droplets was studied, providing a theoretical basis for the hydrogen bonding effect of droplet impact and deposition on superhydrophobic / hydrophobic leaf surfaces. The low retention rate of pesticides on the surface of superhydrophobic plant leaves is a major problem in the pesticide spraying process. This work not only provides a constructive method to overcome the bouncing behavior of droplet interactions in the screening process of agricultural surfactants.

[0091] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. Application of a binary system of dodecyl-β-D-maltoside and glycerol as a pesticide adjuvant in foliar spraying of hydrophobic crops, wherein the binary system of dodecyl-β-D-maltoside and glycerol is an aqueous solution of glycerol with a mass percentage of 0.01% and dodecyl maltoside with a mass percentage of 5 mmol / L; and the pesticide preparation is a thiamethoxam-cyhalothrin suspension, a cyhalothrin microemulsion, a glyphosate soluble solution or a chlorfenapyr suspension.

2. The use according to claim 1, characterized in that: The application comprises the following steps: Dodecyl-β-D-maltoside, glycerol, a pesticide preparation and water are mixed to obtain a diluted mixed solution.

3. The use according to claim 1, characterized in that: When the pesticide preparation is a 5%wt cyhalothrin microemulsion, the dilution multiple of the diluted mixed liquid is 1500 times.

4. The use according to claim 1, characterized in that: When the pesticide preparation is a 41 wt % glyphosate soluble solution, the dilution multiple of the diluted mixed solution is 150 times.

5. The use according to claim 1, characterized in that: When the pesticide preparation is a 200 g / L chlorfenapyr suspension, the dilution multiple of the diluted mixed solution is 1000 times.

6. An independently packaged pesticide composition, characterized in that: The invention comprises independently packaged pesticide preparations and pesticide adjuvants, wherein the pesticide adjuvants are a binary system aqueous solution of glycerol with a mass percentage of 0.01% and dodecyl maltoside with a mass percentage of 5 mmol / L; and the pesticide preparations are thiamethoxam-high-efficiency chlorflucythrinate suspension, chlorflucythrinate microemulsion, glyphosate soluble solution or chlorfenapyr suspension.

7. A pesticide composition, characterized in that: The invention comprises pesticide active components, dodecyl-β-D-maltoside, glycerol and solvent; the pesticide active components are thiamethoxam·high-efficiency chlorflucythrinate suspension, chlorflucythrinate microemulsion, glyphosate soluble solution or chlorfenapyr suspension; dodecyl-β-D-maltoside, glycerol and solvent are binary system aqueous solution with mass percentage of 0.01% glycerol and 5mmol / L dodecyl maltoside.

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