Synergistic auxiliary agent for diaphragm application of corn field herbicide and application of synergistic auxiliary agent

Abstract

The invention belongs to the technical field of pesticides, and particularly relates to a synergistic additive for diaphragm application of a corn field herbicide and application of the synergistic additive. The synergistic auxiliary agent is prepared from the following raw materials: fatty alcohol polyoxyethylene ether glucoside, alkyl ethyl sulfonate, ethyoxyl modified trisiloxane, fatty alcohol polyoxyethylene ether and water. According to the synergistic auxiliary agent, a corn field herbicide can be uniformly retained and permeated on a film of a mulching film for a long time, so that the effects of spraying the herbicide on the film and weeding under the film are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides, and particularly relates to a synergistic adjuvant for diaphragm application of cornfield herbicides and application thereof. Background Art

[0002] The currently widely used agricultural plastic mulch is a plastic film that covers the soil surface. Its light transmittance and thermal radiation transmittance are over 90%, and it has significant functions of increasing temperature, keeping warm, and retaining moisture. It is mainly used to regulate soil temperature, retain moisture, suppress weeds, and improve crop yield and quality. However, the shortcomings of agricultural plastic mulch are also very obvious. Existing mulch films are generally made of polyethylene (PE) or polyhydroxyalkanoate (PHA) materials. The films of these materials have low porosity and high surface tension, resulting in high barrier properties. However, the commonly used ordinary liquid medicines and synergistic adjuvants are generally difficult to spread and retain on the film, and it is even more difficult for them to penetrate under the film to fully contact the weeds and exert their due efficacy. As a result, the weeds under the film cannot be controlled, and weeds and crops compete for nutrients, seriously affecting the normal growth of crops and causing losses to agricultural production. In order to achieve the effect of high-intensity and continuous penetration, there may be abuse and overdose of highly permeable surfactants such as silicone penetrants, which will cause pesticide damage to crops. 3-7 days after spraying, crops will experience curling and yellowing leaves.

[0003] Currently, there are three main methods to solve the problem of weeding under film: the first is to spray herbicides first and then cover the ground with film; this method is time-consuming and labor-intensive, and the weeding method is not flexible enough, and the weeding effect is uncontrollable.

[0004] The second method involves premixing the herbicide, adjuvant, and resin, or adding the herbicide active ingredient to a masterbatch of plastic film and using a blow molding process to create the medicated mulch film. However, this method presents issues with the herbicide active ingredient's decomposition at high temperatures, as well as issues with compatibility and uniformity between the herbicide active ingredient and the resin. Furthermore, the herbicide's soil penetration is poor.

[0005] The third method involves first preparing a film-forming solution with a herbicide, hydrosol, and a water absorbent. This solution is then sprayed, coated, or bonded to a conventional agricultural mulch film to create a double or multi-layer film. The film acts as a weed killer, while the mulch film prevents the evaporation of the herbicide. This effectively controls weeds while also increasing temperature and conserving moisture, promoting crop growth. While this method solves the problem of uniform coating, the coating's poor water absorption and solubility results in poor soil penetration of the herbicide's active ingredients, resulting in suboptimal weed control.

[0006] However, in some agricultural fields such as glutinous corn, there is currently no effective drug-coated mulch film available. Therefore, how to spray herbicides on the ordinary mulch film without drugs to achieve the same weed control effect has become a technical problem that needs to be solved urgently. Summary of the Invention

[0007] The present invention aims to solve the technical problem that spraying herbicides on corn fields after mulching with mulch film cannot effectively achieve weed control, and provides a synergistic auxiliary agent for diaphragm application of herbicides in corn fields and its application. The synergistic auxiliary agent can make the corn field herbicide stay and penetrate evenly on the mulch film for a long time, so as to achieve the effect of spraying herbicides on the film and removing weeds under the film.

[0008] The specific technical solutions are as follows:

[0009] The invention discloses a synergistic auxiliary agent for diaphragm application of cornfield herbicides. The raw materials of the synergistic auxiliary agent are composed of fatty alcohol polyoxyethyl ether glucoside, alkyl ethyl sulfonate, ethoxy modified trisiloxane, fatty alcohol polyoxyethyl ether and water.

[0010] The molecular structural formula of the fatty alcohol polyoxyethyl ether glucoside is: R-(OCH2CH2) n -OG, where R is C 12 -C 18 The fatty alcohol chain of G is glucoside, and n is 3, 5 or 7. n is the addition number of ethylene oxide.

[0011] The molecular structure of the alkyl ethyl sulfonate is: R-CH2CH2-SO3-M+, wherein R is C 13 -C 16 The alkyl group, M + It is a cation.

[0012] Furthermore, the alkyl ethyl sulfonate can be selected from any one of potassium tridecyl ethyl sulfonate, potassium tetradecyl ethyl sulfonate, potassium pentadecyl ethyl sulfonate or potassium hexadecyl ethyl sulfonate.

[0013] The number of ethoxy groups in the ethoxy-modified trisiloxane ranges from 5 to 7. Ethoxy-modified trisiloxanes are a class of organosilicon compounds whose molecular structure is based on trisiloxane and modified with ethoxy groups (-OCH2CH3). Ethoxy-modified trisiloxanes are typically synthesized using hydrogen-containing trisiloxanes or chlorosilanes as raw materials, with ethoxy groups (-OCH2CH3) introduced via a hydrosilylation reaction or alcoholysis reaction.

[0014] The molecular structural formula of the fatty alcohol polyoxyethyl ether is: RO-(CH2CH2O) n -H, where R is C 12 -C 18A fatty alcohol chain, n is 3, 5 or 7. n is the addition number of ethylene oxide.

[0015] Research has shown that the synergist for cornfield herbicide membrane application, formulated according to the above formula, exhibits excellent adhesion, maintaining long-term adherence to the membrane. It also ensures uniform distribution of the cornfield herbicide solution across the mulch film, demonstrating excellent spreadability. Furthermore, the synergist exhibits excellent wetting and penetrating properties, enabling the solution to quickly penetrate the membrane, achieving effective penetration. Furthermore, the synergist exhibits low water quality requirements, maintaining excellent dispersibility and wetting and penetrating properties even in hard water.

[0016] This synergist is compatible with a variety of commonly used cornfield herbicides, including commonly used selective cornfield herbicides. Examples include sulfonylureas (e.g., nicosulfuron), HPPD inhibitors (such as mesotrione and fenpyroxene), 2,4-D, nicotinamide / atrazine, nicotinamide / atrazine, and benzothiazolinone / atrazine. Corn crops requiring mulch, such as spring corn or waxy corn, are suitable.

[0017] In the present invention, the synergistic adjuvant for diaphragm application of cornfield herbicides, the raw material of which, fatty alcohol polyoxyethyl ether glucoside, can be selected from any one of lauryl alcohol polyoxyethyl (3) ether glucoside, lauryl alcohol polyoxyethyl (5) ether glucoside, lauryl alcohol polyoxyethyl (7) ether glucoside, myristyl alcohol polyoxyethyl (3) ether glucoside, myristyl alcohol polyoxyethyl (5) ether glucoside, myristyl alcohol polyoxyethyl (7) ether glucoside, palmitol polyoxyethyl (3) ether glucoside, palmitol polyoxyethyl (5) ether glucoside, palmitol polyoxyethyl (7) ether glucoside, stearyl alcohol polyoxyethyl (3) ether glucoside, stearyl alcohol polyoxyethyl (5) ether glucoside or stearyl alcohol polyoxyethyl (7) ether glucoside.

[0018] Furthermore, the fatty alcohol polyoxyethyl ether glucoside can be selected from any one of lauryl alcohol polyoxyethyl (3) ether glucoside, lauryl alcohol polyoxyethyl (5) ether glucoside, myristyl alcohol polyoxyethyl (7) ether glucoside, palmityl alcohol polyoxyethyl (5) ether glucoside or stearyl alcohol polyoxyethyl (5) ether glucoside.

[0019] In the present invention, the synergistic adjuvant for diaphragm application of cornfield herbicides, the raw material of which, fatty alcohol polyoxyethyl ether, can be selected from any one of laureth-3, laureth-5, laureth-7, myristyl alcohol polyether-3, myristyl alcohol polyether-5, myristyl alcohol polyether-7, palmityl alcohol polyether-3, palmityl alcohol polyether-5, palmityl alcohol polyether-7, stearyl alcohol polyether-3, stearyl alcohol polyether-5 or stearyl alcohol polyether-7.

[0020] Furthermore, the fatty alcohol polyoxyethyl ether can be selected from any one of laureth-5, myreth-7, palmityl ether-5, and steareth-5.

[0021] In the present invention, the synergistic adjuvant for diaphragm application of cornfield herbicides has the following raw material components in percentage by mass: 15%-40% of the fatty alcohol polyoxyethyl ether glucoside, 20%-40% of the alkyl ethyl sulfonate, 1%-8% of the ethoxy-modified trisiloxane, 5%-10% of the fatty alcohol polyoxyethyl ether, and the balance being water.

[0022] In the present invention, the synergistic adjuvant for diaphragm application of cornfield herbicides is a uniform, colorless, transparent, viscous liquid with high physical stability and is not prone to stratification, and is a soluble liquid.

[0023] In the present invention, the synergistic adjuvant for diaphragm application of cornfield herbicides has a viscosity of 800-900 mPa·s and a surface tension of an aqueous solution of 30-32 N / m.

[0024] The preparation method of the herbicide synergistic adjuvant comprises the following steps: stirring and homogenizing the raw material components according to proportion to form a uniform colorless transparent liquid.

[0025] In the present invention, the synergist for diaphragm application of cornfield herbicides is added in an amount of 25-30 mL per 100 g of cornfield herbicide. Studies have found that when the amount of synergist added per 100 g of cornfield herbicide is less than 25 mL, the herbicide is not applied above the diaphragm and the weed control effect below the diaphragm is not optimal. Furthermore, when the amount of synergist added per 100 g of cornfield herbicide exceeds 30 mL, there is a risk of phytotoxicity, such as yellowing of corn leaves.

[0026] The above-mentioned synergistic adjuvant is used in post-emergence weed control using mulch film. This herbicide synergistic adjuvant is primarily designed for use as a selective herbicide on mulch-filmed plots in corn fields. Adding this component allows spraying above the film to kill weeds beneath it. Its application method and timing are essentially the same as conventional application, making it suitable for post-emergence weed control. It is used for applying pesticides above polyethylene or polyhydroxyalkanoate agricultural mulch films. The applicable film thickness is 0.008-0.01 mm.

[0027] Furthermore, the synergistic adjuvant is used in post-emergence weeding of corn by diaphragm application, and is used in weeding of corn by diaphragm application during the 3-5 leaf stage.

[0028] Furthermore, the synergistic adjuvant is used in post-emergence weeding by diaphragm application on corn to remove ryegrass, barnyard grass, foxtail or Leptochloa chinensis.

[0029] The beneficial effects of the present invention are as follows: the synergistic adjuvant for cornfield herbicide film application, through the synergistic interaction of its raw material components, enables the cornfield herbicide to be fully distributed on the ground film, retained uniformly for a long time, and penetrate the ground film, achieving the effect of spraying the herbicide on the film while killing weeds below the film. Furthermore, adding the synergistic adjuvant to the application of the herbicide in unfilmed cornfields exhibits a significant synergistic effect, with bioassays demonstrating a synergistic effect of up to 30%.

[0030] At the same time, the present invention adopts green, environmentally friendly and degradable high-molecular surfactant components, which are safe for corn crops and harmless to beneficial organisms at recommended dosages. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a weed control penetration test for corn sprayed with 30% nicotine and nicotine without adjuvants and 30% nicotine and nicotine with the adjuvant of Example 1, and a comparison of weed growth on the 15th day between the film-covered and unfilm-covered samples.

[0032] Figure 2 This is a weed control penetration test on corn sprayed with 30% nicotine and nicotine without adjuvant and 30% nicotine and nicotine with adjuvant of Example 1, and a comparison of weed growth on film-covered samples on the 15th day (top view).

[0033] Figure 3 This is a weed control penetration test for corn sprayed with 37% Nicotinamide·Atrazine without adjuvant and 37% Nicotinamide·Atrazine with the adjuvant of Example 1, respectively. The weed growth of the experimental samples covered with film and without film on the 15th day was compared.

[0034] Figure 4 This is a weed control penetration test for corn sprayed with 37% Nicotine·Atrazine without adjuvant and 37% Nicotine·Atrazine with the adjuvant of Example 1, respectively. Comparison of weed growth on film-covered samples on the 15th day (top view). DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to specific examples, wherein the reagents used in the specific embodiments are all commercially available products.

[0036] Example 1

[0037] The synergistic adjuvant for diaphragm application of cornfield herbicides is composed of the following raw materials in percentage by mass: 30% lauryl polyoxyethyl (5) ether glucoside, 20% potassium tridecyl ethyl sulfonate, 5% ethoxy-modified trisiloxane (polymerization degree of 5-7), 8% laureth-5, and the balance is water.

[0038] Example 2

[0039] The synergistic adjuvant for diaphragm application of cornfield herbicides is composed of the following raw materials in percentage by mass: 15% lauryl polyoxyethyl (3) ether glucoside, 30% potassium hexadecyl ethyl sulfonate, 8% ethoxy-modified trisiloxane (polymerization degree of 5-7), 10% laureth-5, and the balance is water.

[0040] Example 3

[0041] The synergistic adjuvant for diaphragm application of cornfield herbicides is composed of the following raw materials in percentage by mass: 40% myristyl alcohol polyoxyethyl (7) ether glucoside, 40% potassium pentadecyl ethyl sulfonate, 1% ethoxy-modified trisiloxane (polymerization degree of 5-7), 5% myristyl alcohol polyether-7, and the balance is water.

[0042] Example 4

[0043] The synergistic adjuvant for diaphragm application of cornfield herbicides is composed of the following raw materials in percentage by mass: 15% of palm alcohol polyoxyethyl (5) ether glucoside, 25% of potassium tetradecyl ethyl sulfonate, 3% of ethoxy-modified trisiloxane (polymerization degree of 5-7), 10% of palm alcohol polyether-5, and the balance is water.

[0044] Example 5

[0045] The synergistic adjuvant for cornfield herbicide diaphragm application is composed of the following raw materials in percentage by mass: 25% stearyl alcohol polyoxyethyl (5) ether glucoside, 20% potassium tridecyl ethyl sulfonate, 5% ethoxy-modified trisiloxane (polymerization degree of 5-7), 8% stearyl alcohol polyether-5, and the balance is water.

[0046] Comparative Example 1

[0047] The synergistic aid in this comparative example is different from that in Example 1 in that the fatty alcohol polyoxyethyl ether glucoside is lauryl polyoxyethyl (9) ether glucoside; and the fatty alcohol polyoxyethyl ether is laureth-9.

[0048] The rest is the same as in Example 1.

[0049] Comparative Example 2

[0050] The synergist of this comparative example is different from that of Example 1 in that the fatty alcohol polyoxyethyl ether glucoside is coconut oil alcohol polyoxyethyl (5) ether glucoside; and the fatty alcohol polyoxyethyl ether is coconut oil alcohol polyoxyethyl (5) ether glucoside.

[0051] The rest is the same as in Example 1.

[0052] Comparative Example 3

[0053] The synergist in this comparative example is different from that in Example 1 in that the raw materials do not contain fatty alcohol polyoxyethyl ether glucoside.

[0054] Specifically, the composition is composed of the following raw materials in percentage by mass: 20% potassium tridecyl ethyl sulfonate, 5% ethoxy-modified trisiloxane (polymerization degree of 5-7), 8% laureth-5, and the balance is water.

[0055] Comparative Example 4

[0056] The synergist of this comparative example is different from that of Example 1 in that the synergist is composed of the following raw materials in percentage by mass: 45% lauryl polyoxyethyl (5) ether glucoside, 20% potassium tridecyl ethyl sulfonate, 5% ethoxy-modified trisiloxane (degree of polymerization of 5-7), 15% laureth-5, and the balance is water.

[0057] Experimental Example 1

[0058] The following is a test on the penetration of herbicides in corn fields.

[0059] 1. Purpose of the Test

[0060] Verify the effect of synergistic adjuvants on corn field mulch, the weeds inside the film, and the permeability of the adjuvant on the film.

[0061] 2. Test Supplies

[0062] 1. Test agents: 37% Nicotinamide and Atrazine; 30% Nicotinamide and Atrazine were purchased from Shandong Ludedi Biotechnology Co., Ltd.; 30% Nicotinamide and Atrazine were purchased from Heze Maotai Ruinong Biotechnology Co., Ltd.

[0063] 2. Synergist: the synergist described in each embodiment and comparative example.

[0064] 3. Test weeds: ryegrass, barnyard grass, foxtail and Leptochloa chinensis.

[0065] 3. Experimental Plan

[0066] Using the potting method, apply the pesticide when corn is at the 5-leaf stage. Reduce the dosage by the same ratio: 1g of herbicide needs to be diluted 128 times, and 30mL of synergist needs to be diluted 500 times. After the herbicide and synergist are diluted according to the above ratios, mix 2.5g of the diluted herbicide with 1mL of the dilution synergist, then spray evenly on the corn or on the film covering the potting film. The film covering the potting film is made of polyethylene and is 0.01mm thick.

[0067] Compare the control effects of inside and outside the film on common weeds; compare the safety of corn.

[0068] 4. Experimental Results and Analysis

[0069] (1) Weed control efficacy: On the third, tenth, and fifteenth day after spraying, record the weed species, growth status, and number of weeds to calculate the weed control efficacy. The weed death criterion is complete yellowing of leaves.

[0070] 1. The growth conditions of weeds are as follows:

[0071] (1) The first three days: There is no obvious change in the weeds in the first three days. Most of them are slightly wilted and dry.

[0072] (2) Day 10: The experimental weeds with the adjuvant added had begun to dry up and die.

[0073] (3) Day 15: Figure 1-4 It can be clearly seen that after fifteen days, all the weeds in the experimental group added with the adjuvant of Example 1 dried up and died.

[0074] In the experimental group without adjuvants, the two film-covered experimental samples had only the grass leaves contaminated with drugs at the openings that dried up, while the rest of the weeds were still lush.

[0075] The comparative analysis shown in the figure shows that the addition of the synergistic adjuvant of the present invention significantly enhances the permeability of the herbicide solution and has a strong killing effect on weeds under the film. The killing effect is even better on weeds not covered with film, and the addition can greatly improve the efficacy of the drug.

[0076] 2. Weed control effect

[0077] Control effect per plant (%) = [(number of weed plants in the blank control group - number of weed plants in the experimental group) / number of weed plants in the blank control group] × 100.

[0078] ① The herbicidal effect (plant control rate) on the third, tenth and fifteenth day after film-mulching spraying of each test agent is shown in Table 1.

[0079] Table 1 Potted plant status: covered with film

[0080]

[0081]

[0082] 2. The herbicidal effects of each test agent on the third, tenth, and fifteenth days after spraying without film covering (plant control effect) are shown in Table 2.

[0083] Table 2 Potted plant status: not covered

[0084]

[0085]

[0086] (2) Safety: After application, the growth and development of corn were observed and the safety of each test agent on corn was evaluated.

[0087] ① See Table 3 for the growth of corn on the third, tenth, and fifteenth days after film-mulching and spraying of each test agent.

[0088] Table 3 Potted status: Covered with film

[0089]

[0090]

[0091] ② See Table 4 for the growth of corn on the third, tenth and fifteenth days after spraying each test agent without film covering.

[0092] Table 4 Potted plant status: not covered

[0093]

[0094]

Claims

1. A synergistic adjuvant for cornfield herbicide diaphragm application, characterized in that: The raw materials are composed of fatty alcohol polyoxyethyl ether glucoside, alkyl ethyl sulfonate, ethoxy modified trisiloxane, fatty alcohol polyoxyethyl ether and water; The molecular structural formula of the fatty alcohol polyoxyethyl ether glucoside is: R-(OCH2CH2) n -OG, where R is C 12 -C 18 Fatty alcohol chain, G is glucoside, n is 3, 5 or 7; The molecular structural formula of the alkyl ethyl sulfonate is: R-CH2CH2-SO3 - M + , where R is C 13 -C 16 The alkyl group, M + is a metal cation; The number of ethoxy groups in the ethoxy-modified trisiloxane is 5-7; The molecular structural formula of the fatty alcohol polyoxyethyl ether is: RO-(CH2CH2O) n -H, where R is C 12 -C 18 A fatty alcohol chain, n is 3, 5 or 7.

2. The synergistic adjuvant for cornfield herbicide diaphragm application according to claim 1, characterized in that: The fatty alcohol polyoxyethyl ether glucoside is selected from any one of lauryl alcohol polyoxyethyl (3) ether glucoside, lauryl alcohol polyoxyethyl (5) ether glucoside, lauryl alcohol polyoxyethyl (7) ether glucoside, myristyl alcohol polyoxyethyl (3) ether glucoside, myristyl alcohol polyoxyethyl (5) ether glucoside, myristyl alcohol polyoxyethyl (7) ether glucoside, palmityl alcohol polyoxyethyl (3) ether glucoside, palmityl alcohol polyoxyethyl (5) ether glucoside, palmityl alcohol polyoxyethyl (7) ether glucoside, stearyl alcohol polyoxyethyl (3) ether glucoside, stearyl alcohol polyoxyethyl (5) ether glucoside or stearyl alcohol polyoxyethyl (7) ether glucoside.

3. The synergistic adjuvant for cornfield herbicide diaphragm application according to claim 1, characterized in that: The fatty alcohol polyoxyethyl ether is selected from any one of laureth-3, laureth-5, laureth-7, myreth-3, myreth-5, myreth-7, palmityl-3, palmityl-5, palmityl-7, steareth-3, steareth-5 or steareth-7.

4. The synergistic adjuvant for cornfield herbicide diaphragm application according to claim 1, characterized in that: Calculated by mass percentage, the content of each raw material component is as follows: 15%-40% of the fatty alcohol polyoxyethyl ether glucoside, 20%-40% of the alkyl ethyl sulfonate, 1%-8% of the ethoxy-modified trisiloxane, 5%-10% of the fatty alcohol polyoxyethyl ether, and the balance is water.

5. The synergistic adjuvant for cornfield herbicide diaphragm application according to claim 1, characterized in that: The synergistic agent is a uniform, colorless, transparent, viscous liquid.

6. The synergistic adjuvant for cornfield herbicide diaphragm application according to claim 5, characterized in that: The viscosity of the synergistic auxiliary agent is 800-900 mPa·s, and the surface tension of the aqueous solution is 30-32 N / m.

7. The synergistic adjuvant for cornfield herbicide diaphragm application according to any one of claims 1 to 6, characterized in that: 25-30 mL of the synergistic adjuvant was added to every 100 g of cornfield herbicide.

8. Use of the synergistic adjuvant according to any one of claims 1 to 6 in post-emergence weed control by diaphragm application on corn.

9. Use of the synergistic adjuvant according to claim 8 in post-emergence weeding of corn by diaphragm application, characterized in that: Application in diaphragm application for weed control during the 3-5 leaf stage of corn.

10. Use of the synergistic adjuvant according to claim 8 in post-emergence weeding of corn by diaphragm application, characterized in that: Used to remove ryegrass, barnyard grass, foxtail or chinensis.

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