Diflufenican weeding composition and preparation method thereof

Abstract

The invention relates to the technical field of herbicides, in particular to a diflufenican weeding composition and a preparation method thereof. The diflufenican weeding composition is prepared from the following raw materials in parts by mass: 15 to 25 parts of diflufenican, 4 to 8 parts of flumioxazin, 2 to 6 parts of 2, 4-sodium butyrate, 0.01 to 0.1 part of lanthanum chloride, 1 to 10 parts of dopamine hydrochloride, 4 to 10 parts of nano white carbon black, 0.1 to 1 part of amino-terminated polyamidoamine, 8 to 16 parts of kaolin, 10 to 20 parts of diatomite, 1 to 2 parts of wetting agent and 1 to 2 parts of dispersing agent. The composition disclosed by the invention has the advantages of obvious synergistic effect, rapid pesticide effect development, long lasting period, safety to crops, good prevention effect, reduction of the use dosage of pesticides, reduction of the use frequency of the pesticides, reduction of the adverse influence of the pesticides on the ecological environment, and great economic and social benefits in popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of herbicides, and particularly relates to a flufenacet herbicidal composition and a preparation method thereof. Background Art

[0002] Wheat is an important food crop in China, and weeds in wheat fields have seriously affected wheat production. Flufenacet, belonging to the inhibitor of carotenoid biosynthesis, can cause chlorophyll destruction and cell rupture, thus leading to plant death. It can be used as a selective herbicide and is widely used for controlling weeds in wheat due to its high efficiency, relatively broad herbicidal spectrum and low toxicity to humans. It is suitable for controlling various broad-leaved weeds such as Galium aparine, Polygonum convolvulus, Portulaca oleracea, Solanum nigrum, Stellaria media, Vicia sativa, Convolvulus arvensis, Galeopsis bifida, Polygonum lapathifolium, Polygonum senticosum, Amaranthus retroflexus, Commelina communis, Elsholtzia ciliata, Thlaspi arvense, Vicia sativa, Descurainia sophia and Calystegia hederacea.

[0003] At present, 50% flufenacet water dispersible granules can be used as a substitute for conventional agents for controlling broad-leaved weeds to delay the generation of weed resistance to agents, but it is easy to be lost. And the long-term, repeated and specific application of flufenacet is extremely likely to lead to the enhancement of weed drug resistance and poor control effect.

[0004] Flufenacet has strong mixing performance and has good synergistic effects when mixed with various herbicides. If active compounds with different action mechanisms are combined, it can delay the generation of resistance, improve the control effect and reduce the control cost. Therefore, it has important practical significance to study the combined effect of flufenacet and other herbicides. Summary of the Invention

[0005] The purpose of the present invention is to solve the defects existing in the prior art, and to provide a flufenacet herbicidal composition and a preparation method thereof.

[0006] A flufenacet herbicidal composition, the raw materials of which by mass include: 15-25 parts of flufenacet, 4-8 parts of flumioxazin, 2-6 parts of sodium 2,4-dichlorophenoxyacetate, 0.01-0.1 part of lanthanum chloride, 1-10 parts of dopamine hydrochloride, 4-10 parts of nano-silica, 0.1-1 part of terminal amino polyamidoamine, 8-16 parts of kaolin, 10-20 parts of diatomite, 1-2 parts of wetting agent, and 1-2 parts of dispersant.

[0007] Preferably, the wetting agent is at least one of sodium dodecylbenzenesulfonate, calcium dodecylbenzenesulfonate, sodium dodecyl sulfate and lignosulfonate.

[0008] Preferably, the dispersant is at least one of alkylbenzene sulfonate, alkylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and alkyl ethyl sulfonate.

[0009] Preferably, the generation number of the terminal amino polyamide amine is 2.0 - 4.0 generations.

[0010] The preparation method of the above-mentioned flufenican herbicidal composition comprises the following steps:

[0011] S1. Add nano - silica white and terminal amino polyamide amine into water and ultrasonically treat for 10 - 20 min. Add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, continue ultrasonically treat for 2 - 5 h, add flufenican and continue ultrasonically treat for 1 - 2 h, and then spray - dry to obtain pretreated flufenican;

[0012] S2. Mix the pretreated flufenican, flumioxazin, lanthanum chloride, sodium 2,4 - D butyrate, kaolin, diatomite, wetting agent, and dispersant evenly, perform air - flow pulverization and sieving, knead, granulate, dry, and screen.

[0013] Preferably, in S1, the ultrasonic treatment frequency after adding nano - silica white and terminal amino polyamide amine into water is 30 - 36 kHz.

[0014] Preferably, in S1, the ultrasonic treatment frequency after adjusting the pH value of the system to 7.1 - 7.6 is 20 - 24 kHz.

[0015] Preferably, in S1, the ultrasonic treatment frequency after adding flufenican is 40 - 48 kHz.

[0016] Beneficial effects:

[0017] In the present invention, nano - silica white is dispersed in water with the cooperation of terminal amino polyamide amine, and then a polydopamine structural layer is formed on its surface. Then, flufenican is combined on the polydopamine structural layer, which can significantly prolong the release time limit, improve the adhesiveness, effectively solve the problem of reduced drug efficacy caused by rain washing, and has excellent herbicidal effects. Through experiments, it is found that: the herbicidal effect of the present invention is remarkable, and the time limit is long. At the same time, it has an obvious growth - improving effect on plants, effectively promotes the growth of crops, and improves the soil environment.

[0018] The present invention uses the compounding of pretreated flufenican with flumioxazin and lanthanum chloride, and the synergistic effect is significant. It can not only reduce the dosage of each component, be highly safe for crops, but also have completely different action mechanisms and no cross - resistance, effectively solving the problem of easy generation of resistance.

[0019] The composition mixing of the present invention has an obvious synergistic effect, the drug efficacy is exerted rapidly, the long - term efficacy period is long, it is safe for crops, has good control effect, reduces the use dosage of pesticides, reduces the number of pesticide applications, and reduces the adverse impact of pesticides on the ecological environment. Its popularization and application have great economic and social benefits. Description of the Drawings

[0020] Figure 1 Comparison chart of inhibition rates of fresh weight of Stellaria media and Capsella bursa-pastoris by the flufenacet herbicidal composition obtained in Example 5 and Comparative Examples 1-3.

[0021] Figure 2 Comparison chart of plant control efficacy at 15 days for the groups of Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, and positive control group.

[0022] Figure 3 Comparison chart of plant control efficacy at 45 days for the groups of Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, and positive control group.

[0023] Figure 4 Comparison chart of fresh weight control efficacy at 45 days for the groups of Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, and positive control group.

[0024] Figure 5 Comparison chart of wheat yields and yield increase rates for the groups of Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, positive control group, and negative control group. Detailed implementation manners

[0025] The present invention will be further explained below in conjunction with specific embodiments.

[0026] Example 1

[0027] A flufenacet herbicidal composition, the raw materials of which include: 1500 g of flufenacet, 400 g of flumioxazin, 200 g of sodium 2,4-dichlorophenoxyacetate, 1 g of lanthanum chloride, 100 g of dopamine hydrochloride, 400 g of nano-silica, 10 g of 2.0-generation terminal amino polyamidoamine, 800 g of kaolin, 1000 g of diatomite, 100 g of sodium dodecyl sulfate, and 100 g of dodecylphenol polyoxyethylene ether.

[0028] The preparation method of the above flufenacet herbicidal composition includes the following steps:

[0029] S1. Add nano-silica and terminal amino polyamidoamine to 5000 g of water, ultrasonically treat for 10 min with an ultrasonic frequency of 30 kHz, add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, ultrasonically treat for 2 h with an ultrasonic frequency of 20 kHz, add flufenacet and ultrasonically treat for 1 h with an ultrasonic frequency of 40 kHz, and spray dry to obtain pretreated flufenacet;

[0030] S2. Feed the pre-treated flufenicol, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomaceous earth, sodium dodecyl sulfate, and dodecylphenol polyoxyethylene ether into a mixing kettle to mix evenly, feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and dry and screen them in sequence.

[0031] Example 2

[0032] A flufenicol herbicidal composition, the raw materials of which include: 2500 g of flufenicol, 800 g of flumioxazin, 600 g of sodium 2,4-D butyrate, 10 g of lanthanum chloride, 1000 g of dopamine hydrochloride, 1000 g of nano-silica, 100 g of 4.0-generation terminal amino polyamidoamine, 1600 g of kaolin, 2000 g of diatomaceous earth, and 400 g of sodium dodecylbenzenesulfonate.

[0033] The preparation method of the above flufenicol herbicidal composition includes the following steps:

[0034] S1. Add nano-silica and terminal amino polyamidoamine to 10000 g of water, perform ultrasonic treatment for 20 min with an ultrasonic frequency of 36 kHz, add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, perform ultrasonic treatment for 5 h with an ultrasonic frequency of 24 kHz, add flufenicol and perform ultrasonic treatment for 2 h with an ultrasonic frequency of 48 kHz, and perform spray drying to obtain pre-treated flufenicol;

[0035] S2. Feed the pre-treated flufenicol, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomaceous earth, and sodium dodecylbenzenesulfonate into a mixing kettle to mix evenly, feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and dry and screen them in sequence.

[0036] Example 3

[0037] A flufenicol herbicidal composition, the raw materials of which include: 1800 g of flufenicol, 700 g of flumioxazin, 300 g of sodium 2,4-D butyrate, 8 g of lanthanum chloride, 300 g of dopamine hydrochloride, 800 g of nano-silica, 80 g of 2.5-generation terminal amino polyamidoamine, 1000 g of kaolin, 1800 g of diatomaceous earth, 120 g of lignosulfonate, and 170 g of nonylphenol polyoxyethylene ether.

[0038] The preparation method of the above flufenicol herbicidal composition includes the following steps:

[0039] S1. Add nano-silica white and amino-terminated polyamidoamine to 7000 g of water, and perform ultrasonic treatment for 18 min at an ultrasonic frequency of 32 kHz. Add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, perform ultrasonic treatment for 4 h at an ultrasonic frequency of 21 kHz, add flufenican, and perform ultrasonic treatment for 100 min at an ultrasonic frequency of 42 kHz. Then, perform spray drying to obtain pretreated flufenican;

[0040] S2. Feed the pretreated flufenican, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomite, sodium lignosulfonate, and nonylphenol polyoxyethylene ether into a mixing kettle to mix evenly. Feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and perform drying and screening in sequence.

[0041] Example 4

[0042] A flufenican herbicidal composition, the raw materials of which include: 2200 g of flufenican, 500 g of flumioxazin, 500 g of sodium 2,4-D butyrate, 2 g of lanthanum chloride, 700 g of dopamine hydrochloride, 600 g of nano-silica white, 20 g of 3.5-generation amino-terminated polyamidoamine, 1400 g of kaolin, 1200 g of diatomite, 180 g of sodium lignosulfonate, and 130 g of nonylphenol polyoxyethylene ether.

[0043] The preparation method of the above flufenican herbicidal composition includes the following steps:

[0044] S1. Add nano-silica white and amino-terminated polyamidoamine to 9000 g of water, and perform ultrasonic treatment for 12 min at an ultrasonic frequency of 34 kHz. Add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, perform ultrasonic treatment for 3 h at an ultrasonic frequency of 23 kHz, add flufenican, and perform ultrasonic treatment for 80 min at an ultrasonic frequency of 46 kHz. Then, perform spray drying to obtain pretreated flufenican;

[0045] S2. Feed the pretreated flufenican, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomite, sodium lignosulfonate, and nonylphenol polyoxyethylene ether into a mixing kettle to mix evenly. Feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and perform drying and screening in sequence.

[0046] Example 5

[0047] A flufenacet herbicidal composition, the raw materials of which include: 2000 g of flufenacet, 600 g of flumioxazin, 400 g of sodium 2,4-D butyrate, 5 g of lanthanum chloride, 500 g of dopamine hydrochloride, 700 g of nano-silica, 50 g of 3.0 generation terminal amino polyamidoamine, 1200 g of kaolin, 1500 g of diatomite, 150 g of sodium lignosulfonate, and 150 g of nonylphenol polyoxyethylene ether.

[0048] The preparation method of the above-mentioned flufenacet herbicidal composition includes the following steps:

[0049] S1. Add nano-silica and terminal amino polyamidoamine to 8000 g of water, ultrasonically treat for 15 min with an ultrasonic frequency of 33 kHz, add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, ultrasonically treat for 3.5 h with an ultrasonic frequency of 22 kHz, add flufenacet and ultrasonically treat for 90 min with an ultrasonic frequency of 45 kHz, and spray dry to obtain pretreated flufenacet;

[0050] S2. Feed the pretreated flufenacet, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomite, sodium lignosulfonate, and nonylphenol polyoxyethylene ether into a mixing kettle to mix evenly, feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and dry and screen them in sequence.

[0051] Comparative Example 1

[0052] A flufenacet herbicidal composition, the raw materials of which include: 2000 g of flufenacet, 600 g of flumioxazin, 400 g of sodium 2,4-D butyrate, 5 g of lanthanum chloride, 500 g of dopamine hydrochloride, 700 g of nano-silica, 50 g of 3.0 generation terminal amino polyamidoamine, 1200 g of kaolin, 1500 g of diatomite, 150 g of sodium lignosulfonate, and 150 g of nonylphenol polyoxyethylene ether.

[0053] The preparation method of the above-mentioned flufenacet herbicidal composition includes the following steps:

[0054] S1. Add nano-silica and terminal amino polyamidoamine to 8000 g of water, ultrasonically treat for 15 min with an ultrasonic frequency of 33 kHz, add flufenacet and ultrasonically treat for 90 min with an ultrasonic frequency of 45 kHz, and spray dry to obtain pretreated flufenacet;

[0055] S2. Feed the pretreated flufenicol, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomaceous earth, sodium lignosulfonate, and nonylphenol polyoxyethylene ether into a mixing kettle, mix them evenly, feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and dry and screen them in sequence.

[0056] Comparative Example 2

[0057] A flufenicol herbicidal composition, the raw materials of which include: 2000 g of flufenicol, 600 g of flumioxazin, 400 g of sodium 2,4-D butyrate, 5 g of lanthanum chloride, 500 g of dopamine hydrochloride, 700 g of nano-silica, 50 g of 3.0-generation terminal amino polyamidoamine, 1200 g of kaolin, 1500 g of diatomaceous earth, 150 g of sodium lignosulfonate, and 150 g of nonylphenol polyoxyethylene ether.

[0058] The preparation method of the above flufenicol herbicidal composition includes the following steps:

[0059] S1. Add nano-silica and terminal amino polyamidoamine to 8000 g of water, perform ultrasonic treatment for 15 min at an ultrasonic frequency of 33 kHz, add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, perform ultrasonic treatment for 3.5 h at an ultrasonic frequency of 22 kHz, and spray dry to obtain pretreated silica.

[0060] S2. Feed the pretreated silica, flufenicol, flumioxazin, lanthanum chloride, sodium 2,4-D butyrate, kaolin, diatomaceous earth, sodium lignosulfonate, and nonylphenol polyoxyethylene ether into a mixing kettle, mix them evenly, feed them into a jet mill for jet milling until they pass through a 325-mesh standard sieve, then feed them into a kneader for kneading, put them into an extrusion granulator for extrusion granulation, and dry and screen them in sequence.

[0061] Comparative Example 3

[0062] A flufenicol herbicidal composition, the raw materials of which include: 2000 g of flufenicol, 605 g of flumioxazin, 400 g of sodium 2,4-D butyrate, 500 g of dopamine hydrochloride, 700 g of nano-silica, 50 g of 3.0-generation terminal amino polyamidoamine, 1200 g of kaolin, 1500 g of diatomaceous earth, 150 g of sodium lignosulfonate, and 150 g of nonylphenol polyoxyethylene ether.

[0063] The preparation method of the above flufenicol herbicidal composition includes the following steps:

[0064] S1. Add nano - silica white and amino - terminated polyamidoamine to 8000 g of water, and ultrasonically treat for 15 min at an ultrasonic frequency of 33 kHz. Add dopamine hydrochloride thereto, adjust the pH value of the system to 7.1 - 7.6, ultrasonically treat for 3.5 h at an ultrasonic frequency of 22 kHz, add flufenacet, and ultrasonically treat for 90 min at an ultrasonic frequency of 45 kHz. Then, perform spray drying to obtain pretreated flufenacet.

[0065] S2. Feed the pretreated flufenacet, flumioxazin, sodium 2,4 - D butyrate, kaolin, diatomite, sodium lignosulfonate, and nonylphenol polyoxyethylene ether into a mixing kettle to mix evenly. Feed them into a jet mill for jet milling until they pass through a 325 - mesh standard sieve, then feed them into a kneader for kneading, and put them into an extrusion granulator for extrusion granulation. Then, perform drying and screening in sequence.

[0066] Indoor bioassays were carried out on the flufenacet herbicidal compositions obtained in Example 5 and Comparative Examples 1 - 3, as follows:

[0067] Use galium aparine or capsella bursa - pastoris as the object of pot experiments. Fill the air - dried and sieved sandy loam into flower pots with a diameter of Φ12 cm and a height of 10 cm, filling the flower pots to 4 / 5 of their volume. After fully watering, sow 25 seeds of the object of pot experiments, and cover them with 1 cm of dry soil. Move them into a greenhouse for cultivation. Timely replenish water by means of sub - irrigation. After the weeds emerge, thin out the seedlings, and keep 10 strong and uniform seedlings in each pot for bioassay.

[0068] Add the flufenacet herbicidal compositions obtained in Example 5 and Comparative Examples 1 - 3 to water and ultrasonically disperse them evenly. The effective dose of each group is 150 g a.i. / hm 2 (calculated based on flufenacet); Use an aqueous solution containing 0.2% sodium lignosulfonate and 0.2% nonylphenol polyoxyethylene ether as the blank control treatment.

[0069] At the 2 - 3 - leaf stage of galium aparine and the 3 - 4 - leaf stage of capsella bursa - pastoris, spray - treat with the above - mentioned liquid medicines of each group, and then still place them in the greenhouse for cultivation. Conduct an investigation 30 days after spraying, weigh the fresh weight of the above - ground part, and calculate the fresh weight inhibition rate.

[0070] Fresh weight inhibition rate (%) = (fresh weight of weeds in the blank control group - fresh weight of weeds in the medicament - treated group)÷fresh weight of weeds in the blank control group×100%

[0071] As Figure 1 shown, spraying with the flufenacet herbicidal composition obtained in Example 5 can effectively inhibit the growth of galium aparine and capsella bursa - pastoris.

[0072] Field efficacy tests were carried out on the flufenacet herbicidal compositions obtained in Example 5 and Comparative Examples 1 - 3, as follows:

[0073] In a winter wheat production field in Dangshan County, Suzhou City, Anhui Province, irrigation and drainage are convenient, the fertility is medium, and the soil organic matter content is 1.42%. The previous crop was corn. After the corn was harvested, the field was plowed and wheat was sown. The seeding rate was 150 kg / hm 2 . The main weeds in the field were Galium aparine, Capsella bursa-pastoris, and Descurainia sophia.

[0074] The test treatments were as follows: In the 5 groups of Example 5, the water dispersible agent of the flufenacet herbicidal composition obtained in Example 5 (the effective dose calculated as flufenacet was 150 g a.i. / hm 2 ) was used. In the 1st group of Comparative Example, the water dispersible agent of the flufenacet herbicidal composition obtained in Comparative Example 1 (the effective dose calculated as flufenacet was 150 g a.i. / hm 2 ) was used. In the 2nd group of Comparative Example, the water dispersible agent of the flufenacet herbicidal composition obtained in Comparative Example 2 (the effective dose calculated as flufenacet was 150 g a.i. / hm 2 ) was used. In the 3rd group of Comparative Example, the water dispersible agent of the flufenacet herbicidal composition obtained in Comparative Example 3 (the effective dose calculated as flufenacet was 150 g a.i. / hm 2 ) was used. In the positive control group, 50% flufenacet wettable powder (the effective dose calculated as flufenacet was 150 g a.i. / hm 2 ) was used. In the negative control group, clear water was used. The above-mentioned groups were sprayed in the afternoon without wind during the wheat greening stage (at this time, the broad-leaved weeds in the wheat field were in the stage from emergence to the 4-leaf seedling stage). Each treatment was repeated 5 times, and the plot area was 35 m 2 (7 m × 5 m), and they were arranged in a randomized block design.

[0075] The weeds in each treatment area were investigated and recorded 15 days and 45 days after spraying. Five random sampling points were taken in each plot, and the remaining plant numbers of weeds at each point were recorded. When investigating at 45 days, the above-ground parts of the weeds were taken separately and weighed to calculate the plant control effect and the fresh weight control effect.

[0076] Control effect (%) = [(the number of weeds (or fresh weight) in the negative control group - the number of weeds (or fresh weight) in the treatment area)] ÷ the number of weeds (or fresh weight) in the negative control group × 100%

[0077] As Figures 2 - 4 shown, the control effects of the 5 groups of Example 5 and the 1st - 3rd groups of Comparative Example were all better than those of the positive control group (P < 0.05), and the control effect of the 5 groups of Example 5 was better than those of the 1st - 3rd groups of Comparative Example (P < 0.05).

[0078] After the wheat matured, five random sampling points were taken in each plot, and 1 m 2 of wheat was taken at each point for yield calculation, and the yield per hectare was converted and the yield increase rate was calculated.

[0079] As Figure 5As shown, the wheat yield of the Example 5 group was the highest, and the yield increase rate was also the highest, superior to the other groups (P < 0.05), confirming that the present invention is safe for winter wheat within the effective dose and has a yield increasing effect.

[0080] The applicant believes that in the present invention, nano silica white is dispersed in water in combination with amino-terminated polyamidoamine, and then a polydopamine structure layer is formed on its surface, and then flufenican is combined on the polydopamine structure layer, which can significantly prolong the release time limit and improve the adhesiveness, effectively solving the problem of reduced drug efficacy caused by rain scouring, and the weeding effect is excellent. At the same time, the present invention uses pre-treated flufenican compounded with flumioxazin and lanthanum chloride, and the synergistic effect is significant. It can not only reduce the dosage of each component, is highly safe for crops, but also has completely different action mechanisms and no cross-resistance, effectively solving the problem of easy generation of resistance.

[0081] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A difluanid herbicidal composition, characterized in that: The raw materials include, by mass, 15-25 parts of fluazifop, 4-8 parts of fluazifop, 2-6 parts of 2,4-D butyrate sodium salt, 0.01-0.1 parts of lanthanum chloride, 1-10 parts of dopamine hydrochloride, 4-10 parts of nano-white carbon black, 0.1-1 parts of amino-terminated polyamidoamine, 8-16 parts of kaolin, 10-20 parts of diatomaceous earth, 1-2 parts of wetting agent and 1-2 parts of dispersant.

2. The difluanid herbicidal composition according to claim 1, characterized in that: The wetting agent is at least one of sodium dodecylbenzene sulfonate, calcium dodecylbenzene sulfonate, sodium dodecyl sulfate and lignin sulfonate.

3. The difluanid herbicidal composition according to claim 1, characterized in that: The dispersant is at least one of alkylbenzene sulfonate, alkylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and alkyl ethyl sulfonate.

4. The difluanid herbicidal composition according to claim 1, characterized in that: The generation number of the amino-terminated polyamidoamine is 2.0-4.0 generations.

5. A method for preparing the difluanid herbicidal composition according to any one of claims 1 to 4, characterized in that: The steps include: S1, adding nano-silica gel and amino-terminated polyamidoamine to water and ultrasonically treating for 10-20 min, adding dopamine hydrochloride thereto, adjusting the pH value of the system to 7.1-7.6, continuing the ultrasonic treatment for 2-5 h, adding diflufenicol and continuing the ultrasonic treatment for 1-2 h, and spray drying to obtain pretreated diflufenicol; S2. The pretreated fluazifop, fluazifop-butyl, lanthanum chloride, 2,4-D butyrate sodium salt, kaolin, diatomaceous earth, a wetting agent and a dispersant are uniformly mixed, and the mixture is pulverized and sieved by air flow, kneaded, granulated, dried and sieved.

6. The method for preparing the difluanid herbicidal composition according to claim 5, characterized in that: In S1, nano-silica and amino-terminated polyamidoamine were added to water and then ultrasonically treated at a frequency of 30-36 kHz.

7. The method for preparing the difluanid herbicidal composition according to claim 5, characterized in that: In S1, the frequency of ultrasonic treatment is 20-24 kHz after the pH value of the system is adjusted to 7.1-7.

6.

8. The method for preparing the difluanid herbicidal composition according to claim 5, characterized in that: In S1, the frequency of ultrasonic treatment after adding diflufenicol was 40-48 kHz.

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