MCPA (2-methyl-4-chlorophenoxyacetic acid) sodium complex, microsphere containing complex, preparation method and application

Abstract

The invention belongs to the technical field of pesticide active components, and relates to a 2-methyl-4-chlorophenoxyacetic acid sodium complex, microspheres containing the complex, and a preparation method and application of the 2-methyl-4-chlorophenoxyacetic acid sodium complex. The preparation method comprises the following steps: uniformly mixing a 2-methyl-4-chloro sodium solution with a metal ion compound solution, centrifugally cleaning and drying to obtain a crude complex; and mixing the crude complex with a surfactant, and grinding in water to obtain the 2-methyl-4-chlorophenoxyacetic acid sodium complex suspending agent. The 2-methyl-4-chloro-sodium complex is mixed with a tannic acid solution to obtain the 2-methyl-4-chloro-sodium complex microspheres. On the basis that the activity is obviously improved, the complex and the microspheres have the technical advantages of rain wash resistance and easiness in photolysis.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide active components and relates to a sodium 2-methyl-4-chloro complex, microspheres containing the complex, and a preparation method and application thereof. Background Art

[0002] 2-Methyl-4-chlorophenoxyacetic acid sodium (2-methyl-4-chlorophenoxyacetic acid sodium, MCPA-Na, molecular formula: C 9 H 8 C1O 3 Na, molecular weight: 222.44) is a new type of herbicide, which is widely used in rice, wheat, corn, sorghum, sugarcane, flax and other crop fields to control broad-leaved weeds, such as Amaranthus chinensis, pigweed, Artemisia selengensis, Shepherd's purse, Ophiopogon japonicus, Tripterygium wilfordii, Potamogeton chinensis, etc. 2-Methyl-4-chloro-sodium is a selective systemic herbicide. After being sprayed on the surface of the stems and leaves of weeds, it can penetrate the cuticle and cell membrane into various parts of the weeds, affecting the synthesis of plant nucleic acids and proteins, and eventually killing the weeds. 2-Methyl-4-chloro-sodium is highly soluble in water. In the rainy season in summer, especially in the south where rainfall is frequent and heavy, 2-Methyl-4-chloro-sodium is very easy to be lost, and the weed control effect becomes poor; at the same time, the agent washed away by rainwater will also cause problems such as excessive 2-Methyl-4-chloro-sodium in farmland groundwater and rivers and lakes. Therefore, improving the scouring resistance of 2-Methyl-4-chloro-sodium and improving its environmental friendliness are urgent issues to be solved in this field. Summary of the invention

[0003] Aiming at the problems that the conventional sodium 2-methyl-4-chloro-2-yl chloride is highly water-soluble, easily washed away and has low control effect during use, the present invention proposes a novel sodium 2-methyl-4-chloro-2-yl chloride complex and a preparation method and application of microspheres containing the complex.

[0004] In order to achieve the above object, the present invention is implemented by adopting the following technical solutions: The present invention provides a 2-methyl-4-chloro-sodium complex suspension and a microsphere suspension containing the complex, wherein the preparation steps of the 2-methyl-4-chloro-sodium complex suspension are as follows: (1) The 2-methyl-4-chloro-sodium solution and the metal ion compound solution are mixed evenly to obtain a crude complex A suspension.

[0005] (2) The crude complex A suspension is centrifuged, and the solid obtained after centrifugation is washed and dried to obtain a crude complex A powder.

[0006] (3) The crude complex A powder is mixed with a surfactant and ground in water to obtain a sodium 2-methyl-4-chloro complex suspension.

[0007] The 2-methyl-4-chloro-sodium complex suspension prepared in the above step is mixed with the tannic acid solution to obtain the 2-methyl-4-chloro-sodium complex microsphere suspension.

[0008] Preferably, the metal ions include any one or more of iron ions, zinc ions, copper ions, manganese ions, calcium ions, and aluminum ions.

[0009] Preferably, in step (1), the mass fraction of the sodium 2-methyl-4-chloro-4-yl chloride solution and the metal ion compound solution is 0.5-20%; the molar ratio of the sodium 2-methyl-4-chloro-4-yl chloride to the metal ion compound is 1:(0.2-6).

[0010] Preferably, the surfactant in step (3) is a Tween series surfactant and / or a block polyether surfactant, and the mass ratio of the surfactant to the crude complex A powder is 1:(0.5-10).

[0011] The present invention provides the application of the 2-methyl-4-chloro-sodium complex suspension prepared by the method and the 2-methyl-4-chloro-sodium complex microsphere suspension in herbicides.

[0012] Preferably, the mass fraction of the sodium 2-methyl-4-chloro-1-sodium complex or microspheres in the herbicide is 0.01-60%.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention successfully prepares a 2-methyl-4-chloro-sodium complex with scour resistance and improved activity by complexing 2-methyl-4-chloro-sodium with metal ions and modifying it with a surfactant, and further prepares complex microspheres by encapsulating with tannic acid, which has the technical advantages of being resistant to rain scour and easy to photolyze on the basis of significantly improved activity. The present invention solves the problems of 2-methyl-4-chloro-sodium herbicides being ineffective due to scour in rain and having low weed control activity, conforms to the current green and environmentally friendly production concept, has a simple preparation process, and has stable product quality, and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 a is a microscope photo of the 2-methyl-4-chloro-sodium complex suspension prepared in Example 1, Figure 1 b is a microscope photograph of the sodium 2-methyl-4-chloro-2-base / iron / tannic acid microsphere suspension prepared in Example 1.

[0015] Figure 2 a is the SEM image of the 2-methyl-4-chloro-sodium complex suspension prepared in Example 1, Figure 2 b is the SEM image of the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension prepared in Example 1.

[0016] Figure 3 a is the TEM image of the 2-methyl-4-chloro-sodium complex suspension prepared in Example 1, Figure 3 b is a TEM image of the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension prepared in Example 1.

[0017] Figure 4 These are the XRD patterns of the 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension prepared in Example 1.

[0018] Figure 5 This is the retention curve of pesticide components on the leaf surface.

[0019] Figure 6 This is the photolysis curve of the pesticide components on the leaves. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0022] Example 1 0.3 mol of 2-methyl-4-chloro-sodium was added to deionized water to prepare a 20% 2-methyl-4-chloro-sodium solution, and 0.1 mol of ferric chloride hexahydrate was added to deionized water to prepare a 5% ferric chloride hexahydrate solution. The above-mentioned 2-methyl-4-chloro-sodium solution was mixed with the ferric chloride hexahydrate solution, stirred continuously for 2 hours at a speed of 500 rpm, centrifuged at 8000 rpm for 5 minutes, the supernatant was discarded, deionized water was added to the centrifuge tube for shaking and washing 3 times, and then the solid was scraped and placed in a 60°C oven for 6 hours to obtain a crude powder of 2-methyl-4-chloro-sodium / iron complex. 1 g of the complex crude powder was added to 98 g of deionized water, 1 g of Tween 80 was added, and after stirring and mixing, it was poured into a vertical sand mill and ground at a speed of 1800 rpm for 2 hours. Condensed water was used to cool the grinder during the grinding process. After the grinding, a 2-methyl-4-chloro-sodium complex suspension with a mass fraction of 1% was obtained.

[0023] A 1% sodium 2-methyl-4-chloro-1-yl chloride complex suspension with a 1% sodium 2-methyl-4-chloro-1-yl chloride complex suspension and a 1% sodium tannic acid aqueous solution were mixed in equal volumes to obtain a 1% sodium 2-methyl-4-chloro-1-yl chloride / iron / tannic acid microsphere suspension.

[0024] 2-Methyl-4-chloro-sodium complex suspension and 2-Methyl-4-chloro-sodium / iron / tannic acid microsphere suspension can be directly used as the active ingredient of pesticides. If they are not used for a long time, they need to be sealed and stored. Before use, shake them manually and then dilute them to the corresponding concentration with deionized water or tap water. After testing, the 2-Methyl-4-chloro-sodium complex suspension and 2-Methyl-4-chloro-sodium / iron / tannic acid microsphere suspension prepared in this embodiment were sealed and stored for 6 months, and their morphology and efficacy did not change significantly.

[0025] Example 2 Unless otherwise specified in this embodiment, the preparation process is consistent with that in Embodiment 1.

[0026] 0.5 mol of 2-methyl-4-chloro-sodium was added to deionized water to prepare a 5% 2-methyl-4-chloro-sodium solution, and 0.1 mol of zinc chloride was added to deionized water to prepare a 0.8% zinc chloride solution. The above 2-methyl-4-chloro-sodium solution was mixed with the zinc chloride solution, stirred continuously at 500 rpm for 2 hours, centrifuged at 8000 rpm for 5 minutes, the supernatant was discarded, deionized water was added to the centrifuge tube for shaking and washing 3 times, and then the solid was scraped and placed in a 60°C oven for 6 hours to obtain a crude powder of 2-methyl-4-chloro-sodium / zinc complex. 1 g of the complex crude powder was added to 98 g of deionized water, and 1 g of a block polyether surfactant (Beijing Guangyuan Yinong Chemical Co., Ltd., dispersant 1700) was added. After stirring and mixing, it was poured into a vertical sand mill and ground at 1800 rpm for 2 hours to obtain a 1% 2-methyl-4-chloro-sodium complex suspension.

[0027] A 1% sodium 2-methyl-4-chloro-1-nitrogen complex suspension and a 1% tannic acid aqueous solution were mixed in equal volumes to obtain a 1% sodium 2-methyl-4-chloro-1-nitrogen / zinc / tannic acid microsphere suspension.

[0028] Example 3 Unless otherwise specified in this embodiment, the preparation process is consistent with that in Embodiment 1.

[0029] 0.1 mol of 2-methyl-4-chloro-sodium was added to deionized water to prepare a 20% 2-methyl-4-chloro-sodium solution, and 0.6 mol of calcium chloride was added to deionized water to prepare a 5% calcium chloride solution. The above 2-methyl-4-chloro-sodium solution was mixed with the calcium chloride solution, stirred continuously at 500 rpm for 2 hours, centrifuged at 8000 rpm for 5 minutes, the supernatant was discarded, deionized water was added to the centrifuge tube for 3 times of shaking and washing, and then the solid was scraped and placed in a 60°C oven for 6 hours to obtain a crude powder of 2-methyl-4-chloro-sodium / calcium complex. 1 g of the complex crude powder was added to 98 g of deionized water, and 1 g of Tween 80 was added. After stirring and mixing, it was poured into a vertical sand mill and ground at 1800 rpm for 2 hours to obtain a 1% 2-methyl-4-chloro-sodium complex suspension.

[0030] A 1% sodium 2-methyl-4-chloride complex suspension with a mass fraction of 1% sodium 2-methyl-4-chloride and a 1% tannic acid aqueous solution are mixed in equal volumes to obtain a 1% sodium 2-methyl-4-chloride / calcium / tannic acid microsphere suspension.

[0031] 1. The 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / calcium / tannic acid microsphere suspension prepared in Example 1 were characterized.

[0032] 1. Microscope photography The 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension were diluted 20 times the volume of deionized water, smeared on a glass slide and photographed under a microscope. The results are as follows: Figure 1 As shown. Figure 1 From a, we can see that the 2-methyl-4-chlorosodium complex is transparent, has fuzzy boundaries, is highly flexible, and presents a persimmon-like shape that is concave in the middle and convex around. Figure 1 In b, it can be clearly seen that the 2-Methyl-4-chloro-sodium / iron / tannic acid microspheres have clear boundaries, weak light transmittance, and are smaller and denser than the complex.

[0033] 2. SEM Characterization The 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension were diluted with 20 times the volume of deionized water, and then applied to a silicon wafer for scanning electron microscope photography. The results are as follows: Figure 2 shown. Figure 2 It can be seen from a that the 2-methyl-4-chlorosodium complex has an irregular shape and a soft boundary. Figure 2 From b, it can be seen that the 2-Methyl-4-chloro-sodium / iron / tannic acid microspheres have clear boundaries, regular shapes, and smaller particle sizes.

[0034] 3. TEM Characterization The 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension were diluted 20 times the volume of deionized water and applied to a copper grid for transmission electron microscopy photography. The results are as follows: Figure 3 As shown. Figure 3 Comparison between a and b shows that the 2-Methyl-4-chloro-sodium complex has a uniform texture, while the 2-Methyl-4-chloro-sodium / iron / tannic acid microspheres are thick in the middle and thin at the edges. It is speculated that the thin edge is the tannic acid shell.

[0035] 4. XRD characterization The 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension were placed in an oven and dried at 60°C for more than 6 hours. Then, the dried 2-methyl-4-chloro-sodium complex and 2-methyl-4-chloro-sodium / iron / tannic acid microspheres were analyzed by X-ray diffractometer. The 2θ, angle range and scanning rate were 0.02°, 10°-60° and 2° / min, respectively. The X-ray electron diffraction (XRD) patterns of 2-methyl-4-chloro-sodium, 2-methyl-4-chloro-sodium complex and 2-methyl-4-chloro-sodium / iron / tannic acid microspheres are shown in Figure 4 shown. Figure 4 a is the XRD pattern of sodium 2-methyl-4-chloroformate before modification. Figure 4 It can be seen from a that the XRD spectrum of 2-methyl-4-chlorosodium before modification shows sharp diffraction peaks, and the phase is crystalline; while the 2-methyl-4-chlorosodium complex ( Figure 4 b) 2-Methyl-4-chloro-sodium / iron / tannic acid microspheres ( Figure 4 c) The XRD spectrum shows a large peak, but no obvious sharp crystal diffraction peak, indicating that the 2-methyl-4-chloro-sodium complex and the 2-methyl-4-chloro-sodium / iron / tannic acid microspheres are amorphous phases. Therefore, the two are different from the complex and microspheres of 2-methyl-4-chloro-sodium.

[0036] 2. Effect Verification The effects of the 2-methyl-4-chloro-sodium complex suspension prepared in Example 1 and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension were verified as follows.

[0037] 1. Verification of herbicidal activity The seeds of the cornfield broadleaf weed Amaranthus chinensis were collected in Lincang Town, Mengcheng County, Bozhou City, Anhui Province (116.695503°E / 33.060676°N) in September 2023. The flowerpots are square flowerpots with an upper diameter of about 10 cm, a bottom diameter of about 7 cm, and a height of about 8 cm; the soil is a mixture of substrate soil and nutrient soil in a volume ratio of 1:1; when planting, add the mixed soil to the pot, compact and flatten it, fill it to 4 / 5 of the plastic pot, use infiltration irrigation to add water from the bottom of the pot, so that the soil infiltrates and absorbs water until it is fully saturated, and 6 uniform seeds are sprinkled in each pot, and placed in a greenhouse for cultivation. The temperature in the greenhouse is about 25-30℃, and sufficient water is added every other day to keep the soil moist. It is used after it grows naturally to the 4-6 leaf stage.

[0038] Drug treatment: The test agents used the 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension obtained in Example 1 to verify the effect, and a commercially available 2-methyl-4-chloro-sodium wettable powder with a mass fraction of 56% (Anhui Yinong Chemical Co., Ltd.) was used as a control example; the application dosage was based on the recommended field dose of 56% wettable powder (100-150 kg / mu), and 125 g / mu was used. It was calculated that with 30 kg of water per mu, the effective concentration of 1 times the recommended field dose was about 0.2333%. The effective mass concentrations of the 2-methyl-4-chloro-sodium complex suspension (marked as group a) and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension (marked as group b) prepared in Example 1 were diluted with tap water to 0.2333% for standby use.

[0039] Spraying method: When the C. amaranth grows to the 4-6 leaf stage, the above 1 times recommended field dose is used for stem and leaf spraying, using a 3WP-2000 walking spray tower, the spray pressure is 275 kPa, and the spray volume of group a, group b, and control group is 450 L / hm 2 The distance between the nozzle and the soil surface in the flowerpot was about 30 cm. Three pots were set up for each treatment with the agent, with 6 C. amaranth in each pot. The same mass of clean water was used as a blank control, and the treated weeds were returned to the greenhouse for further cultivation.

[0040] Data processing: 14 days after the pesticide treatment, the aboveground stems and leaves of the weeds were cut, their fresh weight was weighed, and the fresh weight inhibition rate was calculated. The fresh weight inhibition rate 14 days after the pesticide application was calculated according to the following formula: .

[0041] The experimental results are shown in Table 1 below: Table 1 Results of the activity test of 2-methyl-4-chloro-sodium complex and microsphere suspension on Coptidis aurantifolia As shown in Table 1, the 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension prepared in Example 1 both showed higher fresh weight inhibition activity than the commercially available 2-methyl-4-chloro-sodium wettable powder (control example), and the standard deviation was smaller than that of the control example, which means that it can more stably and reliably exert herbicidal activity in a multi-factor field scenario. At the same time, compared with the 2-methyl-4-chloro-sodium complex suspension, the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension has a better inhibitory effect when the effective concentration of 2-methyl-4-chloro-sodium is lower, proving that the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension has a better activity enhancement effect. The 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension prepared in Example 1 both have obvious synergistic activity, and the synergistic effect is particularly significant at low concentrations. This feature has great potential in reducing the use of pesticides and increasing their effectiveness, which is consistent with the national policy requirements for reducing weight and reducing medicines.

[0042] 2. Verification of erosion resistance The 2-methyl-4-chlorosodium complex suspension prepared in Example 1 was diluted with deionized water to a concentration of 20 mg / L, and 100 μL was evenly applied to the surface of the glass slide using a pipette. Three glass slides were treated for each sample. In order to improve the wetting efficiency of the liquid on the glass slide, 0.01% of organic silicon was added to the diluent as a wetting agent. Then, the glass slide with the liquid was placed at room temperature and dried naturally under light-proof conditions. The glass slide had no obvious water stains. Deionized water was evenly sprayed on the surface of the glass slide at a flow rate of 15 mL / min at an angle of 45° at 20 cm above using a small spray device to simulate the scouring behavior of rainwater on the leaf surface. Finally, after 0 min, 0.5 min, 1 min, 2 min, 4 min, 6 min, and 8 min of flushing, the glass slide was removed and placed in a 50 mL centrifuge tube. 40 mL of ethanol was added to the centrifuge tube. After ultrasonic treatment for 30 min, the mixture was extracted by oscillation for 5 min. Then 1 mL of supernatant was taken and impurities were filtered out using a 0.22 μm organic filter membrane. The absorbance at 282 nm was measured using an ultraviolet spectrophotometer. The curve of the standard sample was (y=0.0065x-0.0012, R²=0.9994). The content of 2-methyl-4-chloro-sodium retained on the glass slide after flushing was determined, and the leaf retention rate of 2-methyl-4-chloro-sodium was calculated. The retention curve of the pesticide components on the leaf surface after flushing was drawn. The results are shown in Figure 2. Figure 5 b.

[0043] The commercially available 2-methyl-4-chloro-sodium wettable powder was used as a control. The results are as follows Figure 5 As shown in a.

[0044] The same method as above was used to treat the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension. The results were as follows: Figure 5 c.

[0045] from Figure 5 It can be seen that the control example 2-methyl-4-chloro-sodium wettable powder has almost no residue after 2 minutes, which means that it has been basically washed away by rainwater; while the 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension both show excellent anti-scouring effect. Both can still maintain a high residual amount under longer scouring, among which the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension is more effective. This shows that the 2-methyl-4-chloro-sodium complex suspension and the 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension have good scouring resistance, can resist the adverse external environment, reduce the loss of 2-methyl-4-chloro-sodium, and effectively solve the problem of easy scouring of 2-methyl-4-chloro-sodium itself.

[0046] 3. Photolysis Experiment The 2-methyl-4-chlorosodium complex suspension prepared in Example 1 was diluted with deionized water to a concentration of 20 mg / L. 100 μL was evenly applied to the surface of the glass slide using a pipette. Three glass slides were treated for each sample. In order to improve the wetting efficiency of the drug solution on the glass slide, 0.01% of silicone was added to the diluent as a wetting agent. Then, the glass slide with the drug solution was placed at room temperature and dried naturally in the dark until there was no obvious water stain on the surface of the glass slide. Finally, the glass slide with the drug was placed in a confined space, and the surface was irradiated with ultraviolet light. The ultraviolet irradiation intensity was set to 0.8 W / m 2 After 0 h, 1 h, 2 h, 4 h, 6 h, 8 h, and 10 h of UV irradiation, the slides were taken out and placed in 50 mL centrifuge tubes. 40 mL of ethanol was added to the centrifuge tubes. After ultrasonic treatment for 30 min, the mixture was extracted by oscillation for 5 min. Then 1 mL of supernatant was taken and impurities were filtered out using a 0.22 μm organic filter membrane. The absorbance at 282 nm was measured using a UV spectrophotometer. The content of 2-methyl-4-chloro-sodium after photolysis on the washed slides was measured with reference to the curve of the standard sample. The photolysis rate of 2-methyl-4-chloro-sodium was calculated and the photolysis curve of the foliar pesticide components was drawn. The results are shown in Figure 2. Figure 6 b.

[0047] The commercially available 2-methyl-4-chloro-sodium wettable powder was used as a control. The results are as follows Figure 6 a.

[0048] The commercially available 2-methyl-4-chloro-sodium / iron / tannic acid microsphere suspension was treated in the same manner as above. Figure 6 c.

[0049] from Figure 6 It can be seen that the photolysis rate of 2M sodium 4-chlorobenzene wettable powder is the slowest, which means that its impact on the environment is the most lasting. The degradation rate of 2M sodium 4-chlorobenzene complex suspension and 2M sodium 4-chlorobenzene / iron / tannic acid microsphere suspension is much better than that of 2M sodium 4-chlorobenzene. While ensuring the herbicidal effect, the degradation rate of the agent is faster, which means that it puts less pressure on the environment, is more environmentally friendly, and is more in line with the concept of green and sustainable development.

[0050] Comparative Example 1 The difference between this comparative example and Example 1 is that the amount of Tween 80 used is 0.1 g, and the rest of the preparation process is consistent with Example 1. As a result, it was found under a microscope that the obtained 2-methyl-4-chlorosodium complex has an irregular shape, a clear boundary, and poor scour resistance.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing a 2-methyl-4-chloro-sodium complex suspension agent, characterized in that: Here are the steps: (1) uniformly mixing the 2-methyl-4-chloro-sodium solution and the metal ion compound solution to obtain a crude complex A suspension; (2) centrifuging the crude complex A suspension, washing and drying the solid obtained by centrifugation to obtain a crude complex A powder; (3) The crude complex A powder is mixed with a surfactant and ground in water to obtain a sodium 2-methyl-4-chloro complex suspension.

2. The method for preparing a sodium 2-methyl-4-chloro complex suspending agent according to claim 1, wherein: The metal ions include any one or more of iron ions, zinc ions, copper ions, manganese ions, calcium ions, and aluminum ions.

3. The preparation method of the 2-methyl-4-chloro-sodium complex suspending agent according to claim 1, characterized in that: In the step (1), the mass fraction of the sodium 2-methyl-4-chloro-4-yl chloride solution and the metal ion compound solution is 0.5-20%; the molar ratio of the sodium 2-methyl-4-chloro-4-yl chloride to the metal ion compound is 1:(0.2-6).

4. The method for preparing a sodium 2-methyl-4-chloro complex suspending agent according to claim 1, wherein: The surfactant in step (3) is a Tween series surfactant and / or a block polyether surfactant, and the mass ratio of the surfactant to the crude complex A powder is 1:(0.5-10).

5. A 2-methyl-4-chloro-sodium complex microsphere suspension, characterized in that: The 2-methyl-4-chloro-sodium complex suspension prepared according to any one of claims 1 to 4 is mixed with a tannic acid solution to obtain the suspension.

6. Use of the 2-methyl-4-chloro-sodium complex suspension prepared by the method of any one of claims 1 to 4 in herbicides.

7. Use of the sodium 2-methyl-4-chloro- complex microsphere suspension according to claim 5 in herbicides.

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