AU2020102528A4

AU2020102528A4 - Tank Mix Adjuvant and Preparation Method Thereof

Info

Publication number: AU2020102528A4
Application number: AU2020102528A
Authority: AU
Inventors: Weibao Kong; Congying XU; Guipeng Xue
Original assignee: Jiangsu Bangsheng Biological Technology Co Ltd
Current assignee: Jiangsu Bangsheng Biological Technology Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-11-19
Anticipated expiration: 2028-09-30

Abstract

The disclosure provides a tank mix adjuvant and a preparation method thereof. The tank mix adjuvant includes 0.1-70% of penetrant, 0.1-70% of lecithin, 0.1-50% of vitamin, 1-20% of emulsifier, 0.2-10% of spreading agent and solvent as balance by mass percentage. A method for preparing the tank mix adjuvant includes steps as follows: taking components in determined proportions, adding the lecithin to the solvent at a constant temperature of 40°C under magnetic stirring, dissolving fully, adding the vitamin, then adding the penetrant and the emulsifier, finally adding the spreading agent, and stirring well until a solution is uniformly mixed. The adjuvant of the disclosure has a strong solubilizing and permeating effect. It can improve solubility of a waxy layer on a surface of a target to help destroy a waxy layer structure, and increase a permeation rate of a pesticide liquid. Moreover, the adjuvant of the disclosure can improve effective utilization rate of pesticides and crop resistance to diseases and pests, effectively reduce labor costs and improve economic benefits. 13

Description

TANK MIX ADJUVANT AND PREPARATION METHOD THEREOF TECHNICAL FIELD

The disclosure belongs to the field of pesticide adjuvants, and specifically relates to a tank mix adjuvant and a preparation method thereof.

BACKGROUND

Low effective utilization of pesticides has long been a major problem in pesticide application. This is mainly due to the following two reasons: first, the pesticide droplets tend to bounce and roll off a target surface; second, it is extremely difficult for a pesticide liquid to permeate into a target to obtain an effective lethal concentration. Studies have found that, there is a dense waxy layer on surfaces of pests and plant leaves, which is a key factor responsible for the above two main reasons.

At present, tank mixing pesticide adjuvants on the market are mainly silicone adjuvant, methylated plant or mineral oil, and non-ionic surfactant polyoxyethylene ether. These adjuvants can only show an adjuvant effect in a certain aspect, for example, organic silicon mainly reduces surface tension and promotes spread of the pesticide liquid on the leaves, while methylated vegetable oil moisturizes and promotes permeation.

Therefore, a new tank mix adjuvant which can enhance wetting, spreading and permeating abilities of a pesticide liquid and improve crop resistance to diseases and pests, has great value and meets market demands.

SUMMARY

Objective of the disclosure: an objective of the disclosure is to solve the above technical problems and provide a tank mix adjuvant and a preparation method thereof. The adjuvant of the disclosure can significantly enhance wetting, spreading and permeating abilities of a pesticide liquid to improve an effective utilization rate of a pesticide, promote plant growth, activate an active immune system of a plant, and inhibit formation of pathogenic bacteria. Thereby, the disclosure can effectively reduce labor costs and improve economic benefits.

Technical solution: the tank mix adjuvant of the disclosure includes 0.1-70% of penetrant, 0.1-70% of lecithin, 0.1-50% of vitamin, 1-20% of emulsifier, 0.2-10% of spreading agent and solvent as balance by mass percentage.

Preferably, the tank mix adjuvant includes 0.3-10% of penetrant, 1-30% of lecithin, 1-20% of vitamin, 5-15% of emulsifier, 0.2-10% of spreading agent and solvent as balance by mass percentage.

Preferably, the penetrant is one of or a combination of two of thioketone and azone in any ratio, more preferably thioketone.

Preferably, the vitamin is one of or a combination of two or more of vitamin A, vitamin B, vitamin K, vitamin E, vitamin D, and vitamin C in any ratio, more preferably vitamin E.

Preferably, the emulsifier is one of or a combination of two or more of Nongru 500#, Nongru 600#, Ning-emulsifier 33#, Nongru 700#, cashew oil polyoxyethylene ether, castor oil polyoxyethylene ether, fatty alcohol polyoxyethylene ether, Tween and Span in any ratio.

Preferably, the spreading agent is a silicone surfactant, preferably Silwet 408.

Preferably, the solvent is one of or a combination of two or more of 150# solvent oil, vegetable oil, methyl esterified vegetable oil and mineral oil in any ratio, preferably a combination of 150# solvent oil and methyl esterified vegetable oil.

Preferably, the methyl esterified vegetable oil is one of methyl esterified peanut oil, methyl esterified sunflower seed oil and methyl esterified soybean oil, preferably methyl esterified soybean oil; and the mineral oil is a paraffin oil having a carbon chain distribution of C21-C25.

Preferably, the tank mix adjuvant of the disclosure includes 5% of penetrant, 20% of lecithin, 10% of vitamin, 10% of emulsifier, 5% of spreading agent and solvent as balance by mass percentage.

The disclosure also provides a method for preparing the tank mix adjuvant, including steps as follows: taking components in determined proportions, adding the lecithin to the solvent at a constant temperature of 40°C under magnetic stirring, dissolving fully, adding the vitamin, adding the penetrant and the emulsifier, adding the spreading agent, and stirring well until a solution is uniformly mixed.

Beneficial effects: 1. The adjuvant of the disclosure has a strong solubilizing and permeating effect. It can improve solubility of a waxy layer on surfaces of a target to help destroy a waxy layer structure, and increase a permeation rate of a pesticide liquid, so that the pesticide liquid can permeated into the target to form an effective lethal concentration before harmful organisms develop pesticide resistance.

2. The tank mix adjuvant of the disclosure has a better effect compared with a surfactant alone. It can significantly reduce surface tension of the pesticide liquid, so that particle size distribution of pesticide droplets during atomization is more uniform, reducing drift and prolonging drying time of atomized pesticide droplets. Moreover, the adjuvant can promote adhesion and spread of the pesticide liquid on a hard-to-wet target.

3. The adjuvant of the disclosure has an excellent effect in improving efficacy of herbicides, pesticides and sterilants. A relatively wide application range of the adjuvant meets Chinese national policy requirements for zero growth of pesticides.

DETAILED DESCRIPTION

Examples of the disclosure disclose a tank mix adjuvant and a preparation method thereof. Those skilled in the art can learn from contents of this disclosure and appropriately improve process parameters. It should be particularly pointed out that, all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the disclosure. Products and methods of the disclosure have been described through preferred examples, and relevant personnel can obviously modify or appropriately change and combine the products described herein without departing from the content, spirit and scope of the disclosure to implement and apply the technology of the disclosure.

In order to facilitate better understanding of the disclosure by those skilled in the art, technical solutions of the disclosure are further described below with reference to specific examples. Raw materials in the disclosure are all commercially available products.

Example 1: Preparation of an oil based pesticide adjuvant 1 of the disclosure

Percentages of raw materials: 5% of thiophenone, 20% of lecithin, 10% of vitamin E, 10% of emulsifier (5% of Nongru 500#, 3% of Nongru 600#, 2% of cashew nut oil polyoxyethylene ether), 5% of spreading agent Silwet 408, 30% of 150# solvent oil, and 20% of methyl esterified soybean oil.

Preparation method: 5 kg of the thioketone, 20 kg of the lecithin, 10 kg of the vitamin E, 5 kg of the Nongru 500#, 3 kg of the Nongru 600#, 2 kg of the cashew nut oil polyoxyethylene ether, 5 kg of the spreading agent, 30 kg of the 150# solvent oil and 20 kg of the methyl esterified soybean oil were taken with a total weight of 100 kg. The lecithin was added to a solvent at a constant temperature of 40°C under magnetic stirring and fully dissolved. The vitamin E, then the thioketone and the emulsifier, and finally the spreading agent were added and stirred well until a solution was uniform to obtain the adjuvant 1.

Example 2: Preparation of an oil based pesticide adjuvant 2 of the disclosure

Percentages of raw materials: 10% of thiophenone, 10% of lecithin, 5% of vitamin E, 10% of emulsifier (5% of Nongru 500#, 3% of Ning-emulsifier 33#, 2% of castor oil polyoxyethylene ether), 5% of spreading agent Silwet 408, 30% of 150# solvent oil, and 30% of methyl esterified soybean oil.

Preparation method: 10 kg of the thioketone, 10 kg of the lecithin, 5 kg of the vitamin E, 5 kg of the Nongru 500#, 3 kg of the Ning-emulsifier 33#, 2 kg of the castor oil polyoxyethylene ether, 5 kg of the spreading agent Silwet 408, 30 kg of the 150# solvent oil and 30 kg of the methyl esterified soybean oil were taken with a total weight of 100 kg. The lecithin was added to a solvent at a constant temperature of 40°C under magnetic stirring and fully dissolved. The vitamin, then the thioketone and the emulsifier, and finally the spreading agent were added and stirred well until a solution was uniform to obtain the adjuvant 2.

Example 3: Preparation of an oil based pesticide adjuvant 3 of the disclosure

Percentages of raw materials: 20% of azone, 5% of lecithin, 5% of vitamin E, 10% of emulsifier (4% of Nongru 500#, 3% of Nongru 600#, 3% of fatty alcohol polyoxyethylene ether), 5% of spreading agent Silwet 408, 35% of 150# solvent oil, and 15% of methyl esterified soybean oil.

Preparation method: 10 kg of the azone, 5 kg of the lecithin, 5 kg of the vitamin E, 4 kg of the Nongru 500#, 3 kg of the Nongru 600#, 3 kg of the fatty acid alcohol polyoxyethylene ether, kg of the spreading agent, 35 kg of the 150# solvent oil and 30 kg of the methyl esterified soybean oil were taken with a total weight of 100 kg. The lecithin was added to a solvent at a constant temperature of 40°C under magnetic stirring and fully dissolved. The vitamin, then the azone and the emulsifier, and finally the spreading agent were added and stirred well until a solution was uniform to obtain the adjuvant 3.

Example 4: Preparation of an oil based pesticide adjuvant 4 of the disclosure

Percentages of raw materials: 10% of azone, 20% of lecithin, 10% of vitamin E, 10% of emulsifier (2% of Nongru 500#, 5% of Nongru 600#, 3% of castor oil polyoxyethylene ether), % of spreading agent Silwet 408, 30% of 150# solvent oil, and 15% of methyl esterified soybean oil.

Preparation method: 10 kg of the azone, 20 kg of the lecithin, 10 kg of the vitamin E, 2 kg of the Nongru 500#, 5 kg of the Nongru 600#, 3 kg of the castor oil polyoxyethylene ether, 5 kg of the spreading agent, 30 kg of the 150# solvent oil and 15 kg of the methyl esterified soybean oil were taken with a total weight of 100 kg. The lecithin was added to a solvent at a constant temperature of 40°C under magnetic stirring and fully dissolved. The vitamin, then the azone and the emulsifier, and finally the spreading agent were added and stirred well until a solution was uniform to obtain the adjuvant 4.

Example 5: Preparation of an oil based pesticide adjuvant 5 of the disclosure

Percentages of raw materials: 20% of azone, 10% of lecithin, 5% of vitamin E, 10% of emulsifier (2% of Nongru 500#, 3% of Nongru 6004, 5% of Tween 80), 5% of spreading agent Silwet 408, and 50% of methyl esterified soybean oil.

Preparation method: 20 kg of the azone, 10 kg of the lecithin, 5 kg of the vitamin E, 5 kg of the Nongru 500#, 3 kg of the Nongru 600#, 5 kg of the Tween 80, 5 kg of the spreading agent, 30 kg of the 150# solvent oil and 20 kg of the methyl esterified soybean oil were taken with a total weight of 100 kg. The lecithin was added to a solvent at a constant temperature of °C under magnetic stirring and fully dissolved. The vitamin, then the azone and the emulsifier, and finally the spreading agent were added and stirred well until a solution was uniform to obtain the adjuvant 5.

Example 6: Preparation of an oil based pesticide adjuvant 6 of the disclosure

Percentages of raw materials: 40% of azone, 5% of lecithin, 5% of vitamin E, 10% of emulsifier (3% of Nongru 500#, 5% of Ning-emulsifier 33#, 2% of cashew nut oil polyoxyethylene ether), 5% of spreading agent Silwet 408 and 35% of 150# solvent oil.

Preparation method: 40 kg of the azone, 5 kg of the lecithin, 5 kg of the vitamin E, 3 kg of the Nongru 5004, 3 kg of the Ning-emulsifier 33#, 2 kg of the cashew nut oil polyoxyethylene ether, 5 kg of the spreading agent, 25 kg of the 150# solvent oil and 10 kg of the methyl esterified soybean oil were taken with a total weight of 100 kg. The lecithin was added to a solvent at a constant temperature of 40°C under magnetic stirring and fully dissolved. The vitamin, then the azone and the emulsifier, and finally the spreading agent were added and stirred well until a solution was uniform to obtain the adjuvant 6.

Example 7

Detection of surface and interface properties of a tank mix adjuvant

Surface and interface properties of a tank mix adjuvant to be detected included: liquid surface tension, contact angle and deposition amount of a droplet on a surface of a paraffin board. Selected adjuvants were the adjuvant 1, the adjuvant 2, the adjuvant 3, the adjuvant 4, the adjuvant 5, and the adjuvant 6, which were respectively diluted 4,000 times for detection and compared with water.

Table 1 Surface and interface properties of oil based pesticide adjuvants

Sample Surface tension Contact angle Deposition amount (mN/m) Initial contact Balanced angle (0) contact angle (mg/cm 2

) Water 72.105 109.83 101.96 2.189

Adjuvant 1 28.216 51.50 46.39 2.526

Adjuvant 2 27.743 50.67 45.29 2.634

Adjuvant 3 27.538 50.31 45.15 2.752

27.538 50.31 45.15 2.752 Adjuvant 4

27.538 50.31 45.15 2.752 Adjuvant 5

27.538 50.31 45.15 2.752 Adjuvant 6

It can be seen from Table 1 that, after addition of the adjuvants, the surface tension of water was significantly reduced, resulting in an initial contact angle of a droplet on the surface of the paraffin board reduced by as much as 500. This indicated that the oil based pesticide adjuvants had excellent wetting and spreading abilities, and at the same time dissolved the surface of the paraffin board to a certain extent, thereby significantly reducing the contact angle. Compared with the deposition amount of water on the surface of the paraffin board, the deposition amount was increased slightly after addition of the adjuvants. This indicated that, the oil based pesticide adjuvants increased an interaction force between the droplet and the target surface, so that it was easier for the droplet to adhere to the target surface. Detection of the surface and interface properties of the adjuvants diluted 1,000 times showed that, addition of the adjuvants can improve wetting, spreading and adhesion properties of droplets on the target surface.

Example 8

Detection of surface and interface properties of a pesticide liquid added with a tank mix adjuvant

Laboratory self-made pesticide preparations (30% indoxacarb WDG) were selected and added with an oil based pesticide adjuvant where a pesticide preparation was diluted 2,000 times, and a pesticide preparation was diluted 5,000 times and added with the adjuvant diluted 4,000 times. Surface and interface properties to be detected included: liquid surface tension, contact angle of a droplet on a target surface, and deposition amount of a droplet on the target surface (selected target surfaces were a paraffin board, an apple leaf, and an apple peel). No. 1 represented a pesticide preparation solution diluted 2,000 times, and No. 2 represented a pesticide preparation diluted 5,000 times and added with the adjuvant 2 diluted 4,000 times.

Table 2 Detection of surface and interface properties of a pesticide liquid added with a adjuvant

No. Surface Target surface Contact angle Deposition tension Initial contact Balanced amount

angle(0) contact angle (mg/cm 2 (mN/m)

) (°)

1 35.116 Paraffin plate 81.52 52.17 2.153

Paddy rice leaf 62.38 33.41 2.172

2 27.438 Paraffin plate 59.12 38.67 2.633

Paddy rice leaf 49.16 20.84 2.651

It can be seen from Table 2 that, compared with just the pesticide liquid, the pesticide solution added with the tank mix adjuvant of the disclosure had a lower surface tension and was beneficial to wetting and spreading abilities of droplets on the target surface. It also had a decreased contact angle and especially an increased deposition amount on the paraffin board and the paddy rice leaf. Therefore, addition of the adjuvant can improve wetting, spreading, and deposition adhesion abilities of the pesticide solution, achieving multiple goals by a single measure.

Example 9

Detection of permeability of a pesticide liquid added with a tank mix adjuvant

Detection method of permeability: A canvas round piece with a diameter of 35 mm was immersed in a diluted pesticide preparation solution with a known concentration. As air was contained in cotton fiber gaps, the cotton cloth round piece floated on a liquid surface. When the solution permeated into the cotton cloth, the air was replaced and the cotton cloth round piece began to sink. The time from contact with the liquid surface to initial setting of the cotton cloth round piece was measured to determine permeability of the solution.

Laboratory self-made pesticide preparations (30% indoxacarb WDG) were selected and added with oil based pesticide adjuvants where No. 1 represented a pesticide preparation diluted 2,000 times, No. 2 represented a pesticide preparation diluted 5,000 times and added with the adjuvant 2 diluted 4,000 times, and No. 3 represented a pesticide preparation diluted 5,000 times and added with the adjuvant 5 diluted 4,000 times. Tap water was used as control. Settling time of the canvas piece was measured 3 times in parallel, and an average value was taken.

Table 3 Detection of permeability of a pesticide liquid added with a adjuvant

No. Settling time (3)

First time Second time Third time Average

1 120.31 120.35 120.87 120.51

2 20.46 20.29 20.61 20.45

3 23.47 24.93 24.35 24.25

Tap water 351.12 353.628 352.59 352.45

It can be seen from experimental results that, after addition of the adjuvants, the permeability of the pesticide liquid added with a tank mix adjuvant was significantly increased.

Example 10

Detection of indoor toxicity of a pesticide added with a tank mix adjuvant

Test pesticide: a raw pesticide containing 95% of dinotefuran, a raw pesticide containing 97% of pymetrozine. The raw pesticides containing dinotefuran or pymetrozine to be tested were dissolved in acetone to obtain a 2,000 mg/L stock solution respectively Prepared dinotefuran stock solution and prepared pymetrozine stock solution were mixed in a ratio of 1:3 to obtain a mixed agent.

Test adjuvant: the adjuvant 1 prepared according to the method of Example 1.

Test pest: Nilaparvatalugens.

Test method: rice stalk immersing method: for a control group, a series of concentrations were obtained by diluting a prepared pesticide with a 2% Triton aqueous solution in equal proportions. For a test group, a series of concentrations were obtained by diluting a prepared pesticide with a 1% adjuvant 1 aqueous solution in equal proportions. 5 concentrations were used for each experiment. Robust paddy rice plants from a tillering stage to a booting stage including their roots were pulled out, washed and cut into rooted rice stalks about 10 cm long with 3 plants a group, and dried in a cool place until there was no obvious water. Then the rice stalks were immersed in different concentrations of pesticide solutions for 30 s, taken out and dried. Roots were wrapped with wet degreasing cotton and put into a culture cup. 3rd instar nymphs of the same standard were inoculated with 15 nymphs per cup. Each concentration was repeated 4 times, with a total of 60 nymphs per treatment. The inoculated culture cup was placed in a thermostat light incubator at 25±1°C, with humidity of 70+10% and a light (L)/dark (D) cycle of 16:8 h (L:D). 7 days later, number of surviving pests was checked and recorded, and mortality rate was calculated. Data was processed with a DPS software to obtain a regression equation and LC50.

Experimental results were shown in Table 4.

Table 4 Detection of indoor toxicity of a pesticide added with a tank mix adjuvant

Pesticide Regression equation LC 5o (mg/L) 95% confidence of toxicity interval

Dinotefuran (2% Triton) y=2.530x+4.673 1.346 1.121-1.667

Dinotefuran (1% adjuvant 1) y=1.989x+6.799 0.125 0.088-0.160

Pymetrozine (2% Triton) y=1.361x+1.714 259.444 186.796-419.875

Pymetrozine (1% adjuvant 1) y=1.197x+2.937 52.917 33.535-74.860

Dinotefuran+ pymetrozine (1:3) y=1.876x+4.350 2.221 1.639-3.630 (2% Triton)

Dinotefuran+ pymetrozine (1:3) y=2.394x+7.954 0.058 0.041-0.075 (1% adjuvant 1)

It can be seen from Table 4 that, under indoor conditions, after addition of the adjuvant 1, the dinotefuran, the pymetrozine and the mixed agent of dinotefuran and pymetrozine (1:3) had significantly increased toxicity to Nilaparvata lugens. This indicated that the adjuvant can effectively improve pesticidal activity of the pesticides in controlling pests.

Example 11

Field efficacy test

Test pesticide: 30% indoxacarb water dispersible granules.

Test adjuvant: the adjuvant 2 prepared according to the method of Example 2.

Control object: Cnaphalocrocismedinalis.

Environmental conditions: the experiment was carried out in Hongze County, Huai'an City in China, and the conditions for cultivation, fertilizer and water management and the like in experimental plots were consistent. The test variety was Nanjing 5055.

Experimental design: the experiment had 3 treatments with 4 repeats a treatment, and a total of 12 plots with 20 square meters each plot. The plots were randomly arranged. The 3 treatments were: (1) 30% indoxacarb water dispersible granules applied in 2 g.a.i./mu; (2) 30% indoxacarb water dispersible granules applied in 1.5 g.a.i./mu, and added with the adjuvant 2 diluted 1,000 times; (3) clean water as control. The experiment was carried out with pesticides applied once during a tillering stage of paddy rice and a peak egg incubation period of Cnaphalocrocismedinalis. An electric knapsack sprayer was used to spray 1.5 kg of water per plot on the front and back sides of leaves uniformly.

Investigation method: a total of 25 paddy rice clumps were sampled at five points in each plot. Leaf rolling rate was calculated and compared with that of control plots. Relative control effect was calculated. At the same time, leafroll parasite rate was investigated to calculate the pesticidal effect.

Investigation time: basic number was not investigated before treatment. When the blank control suffered obvious damage or the current generation damage was finalized, the efficacy was investigated once.

Efficacy calculation method:

Leaf rolling rate (%) = number of investigated rolling leaf / total number of investigated leaf x 100

Control effect (%) = (leaf rolling rate in control plots after pesticide application - leaf rolling rate in treatment plots after pesticide application) / leaf rolling rate in control plots after pesticide application x 100

Results were shown in Table 5.

Table 5 Field control effect of a pesticide added with a adjuvant on Cnaphalocrocis medinalis

Name of pesticide for Effect of leaf protection(%) Pesticidal control effect(%) treatment day 7 day 14 day 21 day 7 day 14 day 21

30% indoxacarb water 55.63 68.34 88.30 59.48 81.69 92.25 dispersible granules

2 g.a.i./mu

30% indoxacarb water 59.12 71.56 92.42 62.87 88.92 95.66 dispersible granules 1.5 g.a.i./mu + adjuvant 2

It can be seen from Table 5 that, after addition of the adjuvant, the pesticide still maintained a high control effect when the amount thereof was reduced by 25%, and a relatively high control effect even on day 21 after pesticide application. This indicated that, addition of the oil based pesticide adjuvant can dissolve a waxy layer to promote permeation and absorption of the pesticide, so that the pesticide liquid exhibited excellent performance in the field efficacy experiment.

The above description of the examples is intended to help understand the method and core idea of the disclosure. It should be noted that, several improvements and modifications may be made by persons of ordinary skill in the art without departing from the principle of the disclosure, and these improvements and modifications should also be considered within the protection scope of the disclosure.

The content not described in detail in the description is existing teclmologies known to those skilled in the art.

Claims

What is claimed is:

1. A tank mix adjuvant, comprising 0.1-70% of penetrant, 0.1-70% of lecithin, 0.1-50% of vitamin, 1-20% of emulsifier, 0.2-10% of spreading agent and solvent as balance by mass percentage.

2. The tank mix adjuvant according to claim 1, comprising 0.3-10% of penetrant, preferably 1-30% of lecithin, 1-20% of vitamin, 5-15% of emulsifier, 0.2-10% of spreading agent and solvent as balance by mass percentage.

3. The tank mix adjuvant according to claim 1, wherein, the penetrant is one of or a combination of two of thioketone and azone in any ratio.

4. The tank mix adjuvant according to claim 1, wherein, the vitamin is one of or a combination of two or more of vitamin A, vitamin B, vitamin K, vitamin E, vitamin D, and vitamin C in any ratio;

wherein, the emulsifier is one of or a combination of two or more of Nongru 500#, Nongru 600#, Ning-emulsifier 33#, Nongru 700#, cashew oil polyoxyethylene ether, castor oil polyoxyethylene ether, fatty alcohol polyoxyethylene ether, Tween and Span in any ratio;

wherein, the spreading agent is a silicone surfactant;

wherein, the solvent is one of or a combination of two or more of 150# solvent oil, vegetable oil, methyl esterified vegetable oil and mineral oil in any ratio;

wherein, the methyl esterified vegetable oil is one of methyl esterified peanut oil, methyl esterified sunflower seed oil and methyl esterified soybean oil; and the mineral oil is a paraffin oil having a carbon chain distribution of C21-C25;

comprising 5% of penetrant, 20% of lecithin, 10% of vitamin, 10% of emulsifier, 5% of spreading agent and solvent as balance by mass percentage.

5. A method for preparing the tank mix adjuvant according to any of claims 1-4, comprising steps as follows: taking components in determined proportions, adding the lecithin to the solvent at a constant temperature of 40°C under magnetic stirring, dissolving fully, then adding the vitamin, adding the penetrant and the emulsifier, finally adding the spreading agent, and stirring well until a solution is uniformly mixed.