A herbicidal composition and its application

Abstract

The invention discloses a herbicidal composition and its application, and relates to the field of pesticides. The composition comprises the following raw materials in percentage by weight: 5-60% of propanil, 1-40% of triclopyr, 0.1-22% of picloram, 3-15% of dispersant, 2-10% of wetting agent, 10-40% of disintegrant, and the rest of filler. The water-dispersible granules of the ternary composite composition of the invention can ultimately solve the problems of disintegration and suspension after heat storage by screening suitable dispersants, wetting agents and fillers. The prepared water-dispersible granules have the characteristics of fast disintegration, good dispersibility, high suspension rate and good stability, and are more conducive to the exertion of drug efficacy.

Description

Technical Field

[0001] The present invention relates to the technical field of pesticides, and in particular to a herbicidal composition and application thereof. Background Art

[0002] Rice is the largest grain crop in my country, and there are many kinds of weeds in rice fields. There are about 200 kinds of weeds in rice-growing areas across the country, of which 40 are common and major weeds that cause serious damage. Among the major weeds, barnyard grass has the largest occurrence and damage area, followed by sedge, duckweed, Leptochloa chinensis, Potamogeton and Amaranthus tricolor.

[0003] Propanil (chemical name: N-(3',4'-dichlorophenyl) propionamide) Pure Propanil is white needle-shaped crystals. mp92~93℃, vapor pressure 1.2×10 -2 Pa (60℃). Solubility: 54% ethanol, 60% dimethylformamide, 35% cyclohexanone, 25% methyl ethyl ketone, 3% toluene, 3% xylene, 225mg / L in water. It is hydrolyzed into 3,4-dichloroaniline and propionic acid in strong acidic and alkaline media. It is easy to decompose in the soil, so it is not suitable for soil treatment. Dipyridamole is a highly selective contact herbicide of amides. It is almost not transported in the plant body and only works at the contact site of the agent. The mechanism of action is multi-faceted, not only destroying the photosynthesis of plants, but also inhibiting respiration and oxidative phosphorylation, interfering with nucleic acid and protein synthesis, etc. As a result, the physiological functions of sensitive plants are affected, water loss is accelerated, leaves gradually dry up, and finally die. It is mainly used in rice fields or direct seeding fields. It is a special medicine for controlling barnyard grass. It can also be used to control a variety of other grass and dicotyledonous weeds, such as duck tongue grass, water celery, crabgrass, and foxtail grass.

[0004] Triclopyr (3,5,6-trichloro-2-pyridyloxyacetic acid), triclopyroxyacetic acid, systemic herbicide, pure product is white solid, decomposition temperature is 208℃, melting point is 150.5℃, relative density is 1.85 (21℃), vapor pressure is 0.2mPa (25℃), solubility (25℃g / L): water 0.408, acetone 581, toluene 19.2, acetonitrile 92.1, dichloromethane 24.9, methanol 665, ethyl acetate 271, hexane 0.09. It is acidic (pK.3.97) and stable to hydrolysis. It acts on nucleic acid metabolism, causing plants to produce excessive nucleic acids, causing some tissues to transform into mesenchymal tissues, causing leaves, stems and roots to grow abnormally, storage materials to be exhausted, vascular tissues to be embolized or ruptured, and plants to gradually die. Triclopyr is a conductive herbicide that can be quickly absorbed by the leaves and roots and conducted throughout the plant. This agent is a broadleaf herbicide and is ineffective against grass and sedge weeds. It is used to control broadleaf weeds and shrubs in young coniferous woodlands.

[0005] Picloram (4-amino-3,5,6-trichloropyridine-2-carboxylic acid) is an auxin herbicide, amiloride, white powder, chlorine odor, melting point 215℃, vapor pressure 0.082mPa (35℃). Solubility: 430mg / L in water; 19.8g / L in acetone. The solubility of its potassium salt in 25℃ water is 400g / L. It is stable to acid and alkali. The stable period is 28 days at 50℃, and the half-life in soil is 30-330 days. It is a hormone-type herbicide. It can be absorbed and conducted by plant leaves, roots and stems. It can be quickly conducted to the growth point, causing deformity, withering, defoliation, necrosis of the upper part of the plant, blockage and discoloration of the xylem vessels, and eventually death. The mechanism of action is to inhibit the respiration of the mitochondrial system and nucleic acid metabolism. It is widely used to control broadleaf weeds. Pilosamide and its salts can be quickly absorbed and conducted through leaves and roots. Most broad-leaved crops except cruciferous crops are sensitive to the drug, while most gramineous crops are resistant. It is used for weeding in wheat fields, corn fields and woodlands.

[0006] Herbicide varieties containing a single active ingredient often have defects to varying degrees in agricultural weed control, such as a narrow weed control spectrum, weeds are prone to develop resistance after continuous use, and frequent use will aggravate environmental pollution. Appropriate compound herbicides have positive characteristics such as strong complementarity, obvious synergistic effect, expanded control spectrum, reduced application amount, extended application period, high safety for crops, reduced environmental pollution, and strong compatibility with the environment, and are becoming more and more popular in the market. With the widespread use of the two-element combination of propanil and triclopyr / carbazine in recent years, problems have been exposed: weeds have gradually shown resistance and the amount of medicine used has increased.

[0007] Therefore, it is necessary to develop a new herbicide that can solve the above problems. Summary of the invention

[0008] Purpose of the Invention

[0009] To overcome the above shortcomings, the purpose of the present invention is to provide a herbicidal composition and its application. The water-dispersible granules of the ternary composite composition of the present invention can ultimately solve the problem of disintegration and suspension after heat storage by screening suitable dispersants, wetting agents and fillers. The prepared water-dispersible granules have the characteristics of fast disintegration, good dispersibility, high suspension rate and good stability, which is more conducive to the exertion of drug efficacy. The ternary composite composition of the present invention can not only expand the scope of prevention and control, but also complement and enhance synergy, reduce the amount of product used, and have low application cost, and have the advantages of synergy and delayed drug resistance.

[0010] Solution

[0011] To achieve the purpose of the present invention, the technical solution adopted by the present invention is as follows:

[0012] In a first aspect, the present invention provides a herbicidal composition comprising the following raw materials in percentage by weight: 5-60% of propanil, 1-40% of triclopyr, 0.1-22% of piclopram, 3-15% of dispersant, 2-10% of wetting agent, 10-40% of disintegrant, and the balance of filler.

[0013] Furthermore, it comprises the following raw materials in percentage by weight: 30-60% of propanil, 2-10% of triclopyr, 1-6% of picloram, 3-15% of dispersant, 2-10% of wetting agent, 10-40% of disintegrant, and the rest of filler.

[0014] Furthermore, it comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of picloram, 3-9% of dispersant, 3-6% of wetting agent, 10-30% of disintegrant, and the rest of filler.

[0015] Furthermore, it comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of picloram, 5-8% of dispersant, 3-5% of wetting agent, 10-30% of disintegrant, and the rest of filler.

[0016] Furthermore, it comprises the following raw materials in percentage by weight: 30-50% of propanil, 4-9% of triclopyr, 2-4.5% of picloram, 6-8% of dispersant, 3-5% of wetting agent, 10-30% of disintegrant, and the rest of filler.

[0017] Furthermore, it comprises the following raw materials in percentage by weight: 45-50% of propanil, 8-9% of triclopyr, 4-4.5% of picloram, 6-8% of dispersant, 3-4% of wetting agent, 20-30% of disintegrant, and the rest of filler.

[0018] Furthermore, the dispersant is selected from one or more of sodium lignin sulfonate, maleic acid-acrylic acid copolymer salt, polyoxyethylene-polyoxypropylene block copolymer, sodium alkylphenol sulfonate, alkylnaphthalenesulfonic acid formaldehyde condensate sodium salt, naphthalenesulfonic acid formaldehyde condensate sodium salt, and polycarboxylic acid sodium salt.

[0019] Further, the dispersant comprises sodium lignin sulfonate and sodium polycarboxylate in a weight ratio of (2-8):1. Optionally, the weight ratio of sodium lignin sulfonate and sodium polycarboxylate is (3-6):1, optionally the weight ratio is (3-5):1, optionally the weight ratio is 5:1 or 3:1. Optionally, the dispersant may also comprise one or more of maleic acid-acrylic acid copolymer salt, polyoxyethylene-polyoxypropylene block copolymer, sodium alkylphenol sulfonate, sodium salt of alkylnaphthalenesulfonic acid formaldehyde condensate and sodium salt of naphthalenesulfonic acid formaldehyde condensate.

[0020] Furthermore, the wetting agent is selected from one or more of sodium dodecyl sulfate, α-sulfo fatty acid methyl ester, sodium tetradecyl sulfate, sodium dodecylbenzene sulfonate, sodium alkylnaphthalene sulfonate, sodium alkylphenol polyoxyethylene ether sulfate, sodium lignin sulfonate, pull-opening powder BX, fatty acid sulfate and fatty acid ester sulfate.

[0021] Further, the wetting agent includes sodium alkylphenol polyoxyethylene ether sulfate and sodium alkylnaphthalene sulfonate in a weight ratio of (1-5):1. Optionally, the weight ratio of sodium alkylphenol polyoxyethylene ether sulfate and sodium alkylnaphthalene sulfonate is (2-4):1, optionally the weight ratio is (2-3):1, and optionally the weight ratio is 3:1 or 2:1; optionally, the wetting agent can also include one or more of sodium dodecyl sulfate, α-sulfo fatty acid methyl ester, sodium tetradecyl sulfate, sodium dodecylbenzene sulfonate, sodium lignin sulfonate, pull-open powder BX, fatty acid sulfate and fatty acid ester sulfate.

[0022] Furthermore, the disintegrant is one or more of potassium sulfate, diammonium hydrogen phosphate, urea, sodium sulfate, ammonium sulfate, ammonium nitrate, corn starch, calcium chloride and sodium chloride.

[0023] Further, the disintegrant comprises sodium sulfate and corn starch in a weight ratio of (1-6):1, optionally, the weight ratio of sodium sulfate and corn starch is (2-4):1, optionally the weight ratio is (2-3):1, optionally 3:1 or 2:1; optionally, the disintegrant may also comprise one or more of potassium sulfate, diammonium hydrogen phosphate, urea, ammonium sulfate, ammonium nitrate, calcium chloride and sodium chloride.

[0024] Furthermore, the filler is one or two or more of kaolin, bentonite, talc, attapulgite, diatomaceous earth, white carbon black, starch and light calcium carbonate.

[0025] Optionally, the filler includes kaolin. Optionally, the filler may also include one or two or more of bentonite, talc, attapulgite, diatomaceous earth, white carbon black, and light calcium carbonate.

[0026] Furthermore, the dosage form of the composition is water dispersible granules.

[0027] Furthermore, it comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of piclopram, 4-8% of sodium lignin sulfonate, 1-2% of sodium polycarboxylate, 2-5% of sodium sulfate of alkylphenol polyoxyethylene ether, 1-2% of sodium alkylnaphthalene sulfonate, 8-20% of sodium sulfate, 4-10% of corn starch, and the balance of fillers. The weight ratio of the sodium lignin sulfonate and the sodium polycarboxylate salt is (2-8):1, optionally (3-6):1, optionally (3-5):1, optionally 5:1 or 3:1; optionally, the weight ratio of the sodium alkylphenol polyoxyethylene ether sulfate and the sodium alkylnaphthalene sulfonate is (2-4):1, optionally (2-3):1, optionally 3:1 or 2:1; optionally, the weight ratio of the sodium sulfate and the corn starch is (2-4):1, optionally (2-3):1, optionally 3:1 or 2:1.

[0028] Furthermore, it comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of piclopram, 4-6% of sodium lignin sulfonate, 1-2% of sodium polycarboxylate, 2-4% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 8-20% of sodium sulfate, 4-10% of corn starch, and the balance of fillers. Optionally, the weight ratio of the sodium lignin sulfonate and the sodium polycarboxylate is (3-6):1, optionally the weight ratio is (3-5):1, optionally the weight ratio is 5:1 or 3:1; optionally, the weight ratio of the sodium alkylphenol polyoxyethylene ether sulfate and the sodium alkylnaphthalene sulfonate is (2-4):1, optionally the weight ratio is (2-3):1, optionally the weight ratio is 3:1 or 2:1; optionally, the weight ratio of sodium sulfate and corn starch is (2-4):1, optionally the weight ratio is (2-3):1, optionally the weight ratio is 3:1 or 2:1.

[0029] Further, it comprises the following raw materials in percentage by weight: 45-50% propanil, 8-9% triclopyr, 4-4.5% picloram, 5-6% sodium lignin sulfonate, 1-2% sodium polycarboxylate, 2-3% sodium sulfate of alkylphenol polyoxyethylene ether, 1% sodium alkylnaphthalene sulfonate, 15-20% sodium sulfate, 5-10% corn starch, and the rest is filler. Optionally, the weight ratio of sodium lignin sulfonate to sodium polycarboxylate is (3-5):1, and the weight ratio is optionally 5:1 or 3:1; optionally, the weight ratio of sodium sulfate to corn starch is (2-4):1, and the weight ratio is optionally (2-3):1, and the weight ratio is optionally 3:1 or 2:1.

[0030] Furthermore, it comprises the following raw materials in percentage by weight: 45% of propanil, 9% of triclopyr, 4.5% of piclopram, 5% of sodium lignin sulfonate, 1% of sodium polycarboxylate, 3% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 15% of sodium sulfate, 5% of corn starch, and the balance of fillers.

[0031] Furthermore, it comprises the following raw materials in percentage by weight: 50% of propanil, 8% of triclopyr, 4% of piclopram, 6% of sodium lignin sulfonate, 2% of sodium polycarboxylate, 2% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 20% of sodium sulfate, 10% of corn starch, and the balance of fillers.

[0032] The present invention overcomes the shortcomings of being difficult to suspend and easy to settle by combining a dispersant and a filler; overcomes the shortcoming of being difficult to disintegrate particles by combining a wetting agent and a disintegrant; and overcomes the shortcoming of easy agglomeration of suspended particles by selecting different types of dispersants for combination and screening out the best dispersant combination.

[0033] In a second aspect, a method for preparing the herbicidal composition according to the first aspect is provided, comprising:

[0034] The triclopyr, propanil, picloram, dispersant, wetting agent, disintegrant and filler were mixed evenly in proportion and crushed to a particle size of D by a jet mill. 98 The particles are mixed to obtain a dry material having a size of 15-25 μm; the dry material is then extruded and granulated with water in an amount of 10-25 wt % of the dry material; and the mixture is dried at 40-50° C. to obtain a water dispersible granule containing propanil, triclopyr and picloram;

[0035] Optionally, the pulverizing pressure of the air flow pulverizer is 0.5-0.8 MPa, optionally 0.7 MPa.

[0036] In a third aspect, there is provided a use of the herbicidal composition described in the first aspect or the herbicidal composition prepared by the preparation method described in the second aspect in preventing and controlling weeds in farmland; optionally, the plant weeds include gramineous weeds and / or broadleaf weeds; optionally, the gramineous weeds include one or more of barnyard grass, sedge, lycopodiella cuneata, Setaria viridis, Digitaria sanguinalis, and Eleocharis truncatula,

[0037] Optionally, the broadleaf weeds include one or more of water celery, duckweed, pondweed, purslane, wild amaranth, polygonum, and quinoa.

[0038] Beneficial Effects

[0039] (1) The water-dispersible granules of the present invention can improve the herbicidal effect of the agent, expand the herbicidal spectrum, and improve the safety of crops by compounding diazinon, triclopyr and cypermethrin in a specific ratio; the disintegration performance, suspension rate and stability of the preparation are improved by selecting the adjuvant. The water-dispersible granules have shown good application prospects in preventing and controlling barnyard grass, sedge, duckweed and wild amaranth in rice fields. The ternary compound composition of the present invention can not only expand the scope of prevention and control, but also complement and enhance the effect, reduce the amount of product used, and has low application cost, and has the advantages of enhancing the effect and delaying drug resistance. On the basis of preventing and controlling grass weeds, broad-leaved weeds can be prevented, thereby expanding the herbicidal spectrum. It can prevent and control seriously harmful grass weeds and most broad-leaved weeds and is not easy to develop drug resistance.

[0040] (2) The water-dispersible granules of the ternary composite composition of the present invention can ultimately solve the problem of disintegration and suspension after heat storage by selecting suitable dispersants, wetting agents and fillers. The prepared water-dispersible granules have the characteristics of fast disintegration, good dispersibility, high suspension rate and good stability, which is more conducive to the exertion of drug efficacy. The selection of specific dispersants, wetting agents and fillers of the present invention not only makes the physical properties of the dosage form good, but also can enhance the drug efficacy of the composition. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In addition, in order to better illustrate the present invention, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In certain embodiments, raw materials, schemes, methods, means, etc. well known to those skilled in the art are not described in detail to highlight the gist of the present invention.

[0043] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0044] The above herbicide composition provides a new option for controlling weeds. The present disclosure is further illustrated by examples below, but the present disclosure is not limited thereto.

[0045] In the following examples, propanil, triclopyr and picloram are added as original drugs, all of which are commercially available, and other adjuvants are also commercially available products.

[0046] The present invention is further described in detail below by way of examples.

[0047] In the preparation of water-dispersible granules, dispersants, wetting agents, disintegrants, etc. are mostly organic salts or inorganic salts. The original drugs of triclopyr and chlorpyrifos can form water-soluble salts with metal ions or ammonium ions in the auxiliary agents, while propanil is highly lipophilic. The same water-dispersible granule formula needs to take into account the lipophilic propanil and the hydrophilic triclopyr and chlorpyrifos salts generated with the auxiliary agents. Conventional dispersants are easily desorbed from propanil, making it difficult to prepare ternary water-dispersible granules with rapid disintegration and good suspension and dispersibility.

[0048] In order to obtain ternary water-dispersible granules that can disintegrate quickly and have good suspension and dispersibility, the inventors have conducted extensive screening of the auxiliary agent system. Some of the screened formulas are shown in Table 1.

[0049] Table 1 Raw material composition of each embodiment and comparative example

[0050]

[0051]

[0052] The water dispersible granules of the above examples and comparative examples were prepared according to the following preparation method:

[0053] First, triclopyr, propanil, picloram, dispersant, wetting agent, disintegrant and filler are mixed evenly in a mixer, and then crushed to a particle size of D by a jet mill. 98 The particles are 15-25 μm in diameter, and then mixed evenly to obtain dry material; the dry material is extruded and granulated with water, the amount of water added is 10-25 wt% of the dry material, and then dried at 40-50 ° C to obtain water dispersible granules containing propanil, triclopyr and picloram. The pulverizing pressure of the airflow mill is 0.7 Mpa.

[0054] In the above preparation method, after crushing, the particle size distribution is measured by a laser particle size distribution instrument until the particle size D 98 Between 15-25μm.

[0055] The properties of the water dispersible granules prepared in the above examples and comparative examples were tested, and the results are shown in Table 2.

[0056] Among them, the suspension rate is tested according to the pesticide suspension rate determination method GB / T14825-2006, the wet screening is carried out according to the fineness determination method of the wet screening method (applicable to wettable powders) in Section 2.2 of GB / T16150-1995 Pesticide Powders, and the hot storage stability is tested according to the pesticide hot storage stability determination method GB / T19136-2003.

[0057] Table 2 Water dispersible granules product performance of Examples 1 to 9 and Comparative Example 1

[0058]

[0059]

[0060] As shown in Table 2, the quality of the products of Examples 2 to 6 is relatively stable before and after heat storage, maintaining a high suspension rate and good wet screening, indicating that the auxiliary agent formulation of Examples 2 to 6 is better, while the heat storage stability of the products of Examples 7 to 9 is slightly worse than that of Examples 2 to 6, but the performance is also relatively excellent. However, due to improper selection of dispersants, wetting agents, and disintegrants, the dispersion stability of the preparation of Comparative Example 1 is poor, the suspension rate is low, and the stability after heat storage is greatly reduced. Screening has more fine powder and large particles. Comparative Examples 2 to 6 have a high suspension rate and good heat storage stability due to appropriate selection of auxiliary agents. This shows that the type and ratio of auxiliary agents play a key role in product quality.

[0061] The present invention determines the system with the best matching degree between the components through a large amount of screening work on each component. Among them, the selection of dispersant and wetting agent is particularly critical: dispersant sodium lignin sulfonate and polycarboxylic acid sodium salt are preferred to ensure the dispersion effect; wetting agent alkylphenol polyoxyethylene ether sodium sulfate and alkyl naphthalene sodium sulfonate are preferred to ensure the disintegration and dispersion effect of the effective ingredients. The amount of additives used and the cost of the product are greatly reduced, and at the same time, excellent disintegration and dispersion performance are shown.

[0062] The present invention overcomes the shortcomings of being difficult to suspend and easy to settle by combining a specific dispersant and a filler; overcomes the shortcoming of being difficult to disintegrate particles by combining a specific wetting agent and a disintegrant; and overcomes the shortcoming of easy agglomeration of suspended particles by selecting different types of dispersants for combination and screening out the best dispersant combination.

[0063] Field test example 1: Field test efficacy test on annual weeds in rice fields

[0064] The application method is as follows: spraying the weeds in the rice field at the 4-6 leaf stage, diluting the weeds with water according to the multiple of use when spraying the weeds, applying the weeds at 9-11 am on a sunny day, with a maximum temperature of 25°C and a minimum temperature of 15°C. Five treatments are set, namely: treatment 1: spraying with clean water, blank control; treatment 2: embodiments 1-9 and comparative example 1; treatment 3: comparative example 2 (50% propanil water dispersible granules); treatment 4: comparative example 3 ((propanil 45% + triclopyr 9%) water dispersible granules); treatment 5: comparative example 4 ((propanil 45% + picloram 4.5%) water dispersible granules); treatment 6: comparative example 5 (triclopyr 9% water dispersible granules), treatment 7: comparative example 6 (picloram 4.5% water dispersible granules), treatment 8: comparative example 7 (triclopyr 9% + picloram 4.5%) water dispersible granules. Among them, the preparations of Examples 1 to 9 and Comparative Examples 1 to 7 are all prepared and used immediately.

[0065] Among them, Examples 1 to 9 prepared water-dispersible granules containing propanil, triclopyr and cypermethrin, respectively, and the stems and leaves were sprayed at an effective ingredient dosage of 130 g / mu, Comparative Example 1 was sprayed at an effective ingredient dosage of 130 g / mu, Comparative Example 2 (propanil 50% water-dispersible granules) was sprayed at an effective ingredient dosage of 180 g / mu, and Comparative Example 3 ((propanil 45% + triclopyr 9%) water-dispersible granules) was sprayed at an effective ingredient dosage of 180 g / mu for stem and leaf treatment. Comparative Example 4 ((Bispyribac 45% + Cypermethrin 4.5%)) water dispersible granules were used for stem and leaf treatment at an effective ingredient dosage of 180 g / mu; Comparative Example 5: (Chloropyr 9% water dispersible granules) was used for stem and leaf treatment at an effective ingredient dosage of 180 g / mu, Comparative Example 6 (Cloropyr 4.5% water dispersible granules) was used for stem and leaf treatment at an effective ingredient dosage of 180 g / mu, and Comparative Example 7 (Chloropyr 9% + Cypermethrin 4.5%) water dispersible granules were used for stem and leaf treatment at an effective ingredient dosage of 180 g / mu.

[0066] The pesticide was applied once with a Gongnong-16 backpack manual sprayer, and 450 kg of liquid was added to water per hectare to prepare the pesticide, and sprayed evenly. The weather was good during the test, with an average daily temperature of 20-25℃. There was no rain on the day of application, and no rain within 10 days after the application.

[0067] Thirty days after application, the fresh weight control effect of each treatment on weeds and the safety to rice were investigated. The results are shown in Table 3.

[0068]

[0069] Table 3 Results of efficacy test of each treatment agent on annual weeds in rice fields

[0070]

[0071] It can be seen from the test results in the above table that the combination of propanil, triclopyr and cypermethrin has a good control effect on grass weeds and broad-leaved weeds in rice fields. Examples 1 to 9 and comparative example 1 are compared with the control drugs (treatments 3 to 8), showing obvious synergistic effects, especially the synergistic effects of Examples 1 to 6 are more significant. Specifically, compared with treatment 2 and control drug treatments 3, 4, 5, 6, 7, and 8, the three-way combination has excellent effects on the control of grass weeds barnyard grass and sedge, and also has a synergistic effect on the control of broad-leaved weeds. Compared with the two-way combination of treatment 2 and control drug treatments 4, 5, and 8, the three-way combination has increased the efficacy of the malignant weeds barnyard grass and sedge with drug resistance, achieving the effect of increasing efficacy and reducing application; it also has a synergistic effect on the control of broad-leaved weeds. Compared with the two-way combination of treatment 2 and the control agent treatment 4, 5, and 8, the three-way combination has enhanced the control of broad-leaved weeds, and at the same time expanded the weed control spectrum and had excellent control effects on barnyard grass and sedge.

[0072] From the comparison of the efficacy of each example and the comparative example, it can be seen that the selection of adjuvants has an important influence on the performance of the active ingredients, and improper selection of adjuvants will affect the compounding effect of propanil, triclopyr and picloram. The control effect of Examples 2 to 6 using the preferred adjuvants is significantly better than that of Examples 1, 8 and 9.

[0073] In addition, based on the full observation of the field test, within the test dosage range, the rice fields grew well and no pesticide damage occurred, indicating that the compound agent has no pesticide damage to rice fields.

[0074] The present invention greatly reduces the processing difficulty of the dosage form and improves the stability of the dosage form through the coordinated matching of various auxiliary agents, especially the coordinated matching of three auxiliary agents: dispersant, wetting agent, disintegrant and filler. The water-dispersible granules finally obtained have the advantages of fast disintegration, good dispersibility, high suspension rate and good stability, and effectively solve or reduce the problems of non-disintegration of the preparation and poor thermal storage stability.

[0075] The ternary compound composition of the present invention can expand the weed control spectrum, increase the efficacy, and reduce the dosage of the preparation. The water dispersible granules of the present invention do not use organic solvents, thus avoiding unfavorable factors such as flammability, explosion and environmental damage; it is easy to weigh and package, thus avoiding the problems of wall sticking, cleaning and recycling packaging generated during use; it has certain strength and easy disintegration characteristics, basically does not generate dust, and is safe to use.

[0076] The present invention improves product stability by screening suitable auxiliary agents, and can withstand high and low temperature ranges of 10° C. to 54° C., effectively solving the impact of environmental changes during transportation; it meets the use of different countries and regions, is conducive to large-scale promotion and application, and has excellent efficacy performance.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A herbicidal composition, characterized in that The invention comprises the following raw materials in percentage by weight: 30-50% propanil, 2-9% triclopyr, 2-4.5% picloram, 3-9% dispersant, 3-6% wetting agent, 10-30% disintegrant, and the rest filler; The dispersant comprises sodium lignin sulfonate and sodium polycarboxylate in a weight ratio of (2-8):1; The wetting agent comprises sodium alkylphenol polyoxyethylene ether sulfate and sodium alkylnaphthalene sulfonate in a weight ratio of (2-4):1; The disintegrant comprises sodium sulfate and corn starch in a weight ratio of (1-6):1; The filler is kaolin.

2. The herbicidal composition according to claim 1, characterized in that The invention comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of picloram, 5-8% of dispersant, 3-5% of wetting agent, 10-30% of disintegrant and the balance of filler.

3. The herbicidal composition according to claim 1, characterized in that The invention comprises the following raw materials in percentage by weight: 30-50% of propanil, 4-9% of triclopyr, 2-4.5% of picloram, 6-8% of dispersant, 3-5% of wetting agent, 10-30% of disintegrant and the balance of filler.

4. The herbicidal composition according to claim 1, characterized in that The invention comprises the following raw materials in percentage by weight: 45-50% of propanil, 8-9% of triclopyr, 4-4.5% of picloram, 6-8% of dispersant, 3-4% of wetting agent, 20-30% of disintegrant and the balance of filler.

5. The herbicidal composition according to claim 1, characterized in that In the dispersant, the weight ratio of sodium lignin sulfonate and sodium polycarboxylate is (3-6):

1.

6. The herbicidal composition according to claim 1, characterized in that In the dispersant, the weight ratio of sodium lignin sulfonate and sodium polycarboxylate is (3-5):

1.

7. The herbicidal composition according to claim 1, characterized in that In the dispersant, the weight ratio of sodium lignin sulfonate to sodium polycarboxylate is 5:

1.

8. The herbicidal composition according to claim 1, characterized in that In the dispersant, the weight ratio of sodium lignin sulfonate to sodium polycarboxylate is 3:

1.

9. The herbicidal composition according to claim 1, characterized in that The weight ratio of sodium alkylphenol polyoxyethylene ether sulfate and sodium alkylnaphthalene sulfonate is (2-3):

1.

10. The herbicidal composition according to claim 1, characterized in that The weight ratio of sodium alkylphenol polyoxyethylene ether sulfate to sodium alkylnaphthalene sulfonate is 3:

1.

11. The herbicidal composition according to claim 1, characterized in that The weight ratio of sodium alkylphenol polyoxyethylene ether sulfate to sodium alkylnaphthalene sulfonate is 2:

1.

12. The herbicidal composition according to any one of claims 1 to 11, characterized in that The weight ratio of sodium sulfate to corn starch is (2-4):

1.

13. The herbicidal composition according to any one of claims 1 to 11, characterized in that The weight ratio of sodium sulfate to corn starch is (2-3):

1.

14. The herbicidal composition according to any one of claims 1 to 11, characterized in that The weight ratio of sodium sulfate to corn starch is 3:

1.

15. The herbicidal composition according to any one of claims 1 to 11, characterized in that The weight ratio of sodium sulfate to corn starch is 2:

1.

16. The herbicidal composition according to any one of claims 1 to 11, characterized in that The dosage form of the composition is water dispersible granules.

17. The herbicidal composition according to any one of claims 1 to 11, characterized in that The invention comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of piclopram, 4-8% of sodium lignin sulfonate, 1-2% of sodium polycarboxylate, 2-5% of sodium sulfate of alkylphenol polyoxyethylene ether, 1-2% of sodium alkylnaphthalene sulfonate, 8-20% of sodium sulfate, 4-10% of corn starch and the balance of fillers.

18. The herbicidal composition according to any one of claims 1 to 11, characterized in that The invention comprises the following raw materials in percentage by weight: 30-50% of propanil, 2-9% of triclopyr, 2-4.5% of piclopram, 4-6% of sodium lignin sulfonate, 1-2% of sodium polycarboxylate, 2-4% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 8-20% of sodium sulfate, 4-10% of corn starch and the balance of fillers.

19. The herbicidal composition according to any one of claims 1 to 11, characterized in that The invention comprises the following raw materials in percentage by weight: 45-50% of propanil, 8-9% of triclopyr, 4-4.5% of piclopram, 5-6% of sodium lignin sulfonate, 1-2% of sodium salt of polycarboxylate, 2-3% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 15-20% of sodium sulfate, 5-10% of corn starch and the balance of fillers.

20. The herbicidal composition according to any one of claims 1 to 11, characterized in that The invention comprises the following raw materials in percentage by weight: 45% of propanil, 9% of triclopyr, 4.5% of piclopram, 5% of sodium lignin sulfonate, 1% of sodium salt of polycarboxylate, 3% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 15% of sodium sulfate, 5% of corn starch and the balance of fillers.

21. The herbicidal composition according to any one of claims 1 to 11, characterized in that The invention comprises the following raw materials in percentage by weight: 50% of propanil, 8% of triclopyr, 4% of piclopram, 6% of sodium lignin sulfonate, 2% of sodium polycarboxylate, 2% of sodium sulfate of alkylphenol polyoxyethylene ether, 1% of sodium alkylnaphthalene sulfonate, 20% of sodium sulfate, 10% of corn starch and the balance of fillers.

22. A method for preparing the herbicidal composition according to any one of claims 1 to 21, characterized in that: include: The triclopyr, propanil, picloram, dispersant, wetting agent, disintegrant and filler were mixed evenly in proportion and crushed to a particle size of D by a jet mill. 98 The particles are uniformly mixed to obtain dry material; the dry material is extruded and granulated with water in an amount of 10-25 wt % of the dry material, and dried at 40-50 ° C to obtain water dispersible granules containing propanil, triclopyr and cypermethrin.

23. The preparation method according to claim 22, characterized in that: The crushing pressure of the air flow mill is 0.5~0.8Mpa.

24. The preparation method according to claim 22, characterized in that: The pulverizing pressure of the air flow pulverizer is 0.7Mpa.

25. Use of the herbicidal composition according to any one of claims 1 to 21 or the herbicidal composition prepared by the preparation method according to any one of claims 22 to 24 in controlling weeds in farmland.

26. The use according to claim 25, characterized in that The plant pests include grass weeds and / or broadleaf weeds.

27. The use according to claim 25, characterized in that The grass weeds include one or more of Echinochloa crusgalli, Cyperus rotundus, Leptochloa chinensis, Setaria viridis, Digitaria sanguinea, and Goosegrass.

28. The use according to claim 25, characterized in that Broadleaf weeds include one or more of water celery, duckweed, pondweed, purslane, wild amaranth, polygonum, and quinoa.

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