A synergistic adjuvant for corn field herbicide diaphragm application and application thereof

Abstract

The application belongs to the technical field of pesticides, and particularly relates to a synergistic adjuvant for corn field herbicide diaphragm application and application thereof. The raw materials of the synergistic adjuvant are composed of fatty alcohol polyoxyethylene ether glucoside, alkyl ethyl sulfonate, ethoxy-modified trisiloxane, fatty alcohol polyoxyethylene ether and water. The synergistic adjuvant can make the corn field herbicide uniformly stay and penetrate on the film of the mulch for a long time, so that the effect of spraying the herbicide on the film and weeding under the film is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pesticides, and particularly relates to a synergistic agent for corn field herbicide membrane application and application thereof. BACKGROUND

[0002] The agricultural plastic mulch commonly used at present is a plastic film covering the surface of soil, which has a light transmittance and thermal radiation transmittance of more than 90%, and has significant functions of increasing temperature, keeping temperature and moisture, and is mainly used for adjusting soil temperature, keeping moisture, inhibiting weeds, and improving crop yield and quality. However, the agricultural plastic mulch also has obvious disadvantages. The existing plastic mulch generally adopts polyethylene (PE) or polyhydroxyalkanoate (PHA) material, and the film made of these materials has low porosity and high surface tension, thereby having high barrier property. The common liquid pesticide and synergistic agent are generally difficult to spread and stay on the film, and are more difficult to penetrate into the film to fully contact with weeds and play the expected effect, so that the weeds under the film cannot be controlled, and the weeds and crops compete for nutrients, which seriously affects the normal growth of crops and causes losses to agricultural production. In order to achieve the effect of high-strength and continuous penetration, a surfactant such as silicone penetrant with high penetration may be used in an excessive amount, which may cause pesticide damage to crops, and the crops may appear leaf curling and yellowing 3-7 days after spraying.

[0003] At present, there are three methods to solve the problem of weed control under the film. The first method is to spray herbicide first and then cover the film. This method is time-consuming and labor-intensive, and the weed control method is not flexible and the effect is uncontrollable.

[0004] The second method is to fully mix the herbicide, the synergistic agent and the resin, or to add the active ingredient of the herbicide into the master batch of the plastic film, and to make the drug-containing film by blow molding. However, this method has problems that the active component of the herbicide is easily decomposed by high temperature, and the active component of the herbicide and the resin have problems of phase solubility and uniformity. At the same time, the herbicide has poor penetration into the soil.

[0005] The third method is to prepare a drug film liquid by using herbicide, water-soluble glue and water-absorbing agent, and then to make a double-layer or multi-layer film by spraying or coating, bonding and other methods, wherein the drug film achieves the effect of weed control, and the film prevents the volatilization of the drug, which can effectively control the growth of weeds, increase the temperature and moisture, and promote the growth of crops. Although this method solves the problem of uniformity of the coating, the poor water-solubility of the coating leads to poor penetration of the active ingredient of the herbicide into the soil, thereby causing poor weed control function.

[0006] However, in some agricultural fields such as waxy corn, there is currently no effective drug-containing mulch available for use, so how to spray herbicides on the mulch after the common mulch is covered without drugs can also achieve the same herbicidal effect, which becomes a technical problem that needs to be solved urgently. SUMMARY

[0007] The present application provides a synergistic adjuvant for herbicide membrane application in corn fields and its application, which can make the herbicide in corn fields stay on the film of the mulch for a long time and penetrate uniformly, achieving the effect of spraying herbicides on the film and killing weeds under the film.

[0008] The specific technical solutions are as follows:

[0009] A synergistic adjuvant for herbicide membrane application in corn fields, which is composed of fatty alcohol polyoxyethylene glycerin, alkyl ethyl sulfonate, ethoxy-modified trisiloxane, fatty alcohol polyoxyethylene ether and water.

[0010] The molecular structure of the fatty alcohol polyoxyethylene glycerin is: R-(OCH2CH2) n -O-G, wherein R is a C 12 -C 18 fatty alcohol chain, G is glycoside, and n is 3, 5 or 7. N is the number of ethylene oxide additions.

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

[0012] Further, 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 is 5-7. Ethoxy-modified trisiloxane is a class of organosilicon compounds, whose molecular structure has trisiloxane as the core and is modified by ethoxy (-OCH2CH3). The synthesis of ethoxy-modified trisiloxane usually uses hydrogen-containing trisiloxane or chlorosilane as raw material, and introduces ethoxy (-OCH2CH3) through silicon hydrogen addition reaction or alcoholysis reaction.

[0014] The molecular structure of the fatty alcohol polyoxyethylene ether is: R-O-(CH2CH2O) n -H, wherein R is a C 12 -C 18a fatty alcohol chain, and n is 3, 5 or 7. n is the number of addition of ethylene oxide.

[0015] The corn field herbicide film application synergistic adjuvant prepared according to the above formula has good adhesion and can adhere to the film for a long time. The corn field herbicide liquid can be evenly spread on the film, and the synergistic adjuvant has good spreading property. The synergistic adjuvant has good wetting and penetration property, and the liquid can quickly penetrate the film. The synergistic adjuvant has good dispersibility and wetting and penetration property even in hard water.

[0016] The synergistic adjuvant can be applied to various commonly used corn field herbicides, such as commonly used selective corn field herbicides. For example, sulfonylurea (such as nicosulfuron), HPPD inhibitor (such as mesotrione, carfentrazone-ethyl, etc.), 2,4-D, atrazine, ametryn, metribuzin, and carfentrazone-ethyl. The corn is spring corn or waxy corn, and the like.

[0017] In the present application, the raw material fatty alcohol polyoxyethylene ether of the corn field herbicide film application synergistic adjuvant can be selected from any one of lauryl alcohol polyoxyethylene (3) ether glycoside, lauryl alcohol polyoxyethylene (5) ether glycoside, lauryl alcohol polyoxyethylene (7) ether glycoside, myristyl alcohol polyoxyethylene (3) ether glycoside, myristyl alcohol polyoxyethylene (5) ether glycoside, myristyl alcohol polyoxyethylene (7) ether glycoside, palmityl alcohol polyoxyethylene (3) ether glycoside, palmityl alcohol polyoxyethylene (5) ether glycoside, palmityl alcohol polyoxyethylene (7) ether glycoside, stearyl alcohol polyoxyethylene (3) ether glycoside, stearyl alcohol polyoxyethylene (5) ether glycoside, or stearyl alcohol polyoxyethylene (7) ether glycoside.

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

[0019] In the present application, the raw material fatty alcohol polyoxyethylene ether of the corn field herbicide film application synergistic adjuvant can be selected from any one of lauryl alcohol polyoxyethylene (3) ether glycoside, lauryl alcohol polyoxyethylene (5) ether glycoside, lauryl alcohol polyoxyethylene (7) ether glycoside, myristyl alcohol polyoxyethylene (3) ether glycoside, myristyl alcohol polyoxyethylene (5) ether glycoside, myristyl alcohol polyoxyethylene (7) ether glycoside, palmityl alcohol polyoxyethylene (3) ether glycoside, palmityl alcohol polyoxyethylene (5) ether glycoside, palmityl alcohol polyoxyethylene (7) ether glycoside, stearyl alcohol polyoxyethylene (3) ether glycoside, stearyl alcohol polyoxyethylene (5) ether glycoside, or stearyl alcohol polyoxyethylene (7) ether glycoside.

[0020] Further, the fatty alcohol polyoxyethylene ether can be selected from any one of lauryl alcohol polyether-5, myristyl alcohol polyether-7, palmityl alcohol polyether-5, or stearyl alcohol polyether-5.

[0021] In the present application, the corn field herbicide membrane application synergist, according to the mass percentage, the content of each raw material component is as follows: the fatty alcohol polyoxyethylene ether glucoside is 15%-40%, the alkyl ethyl sulfonate is 20%-40%, the ethoxy modified trisiloxane is 1%-8%, the fatty alcohol polyoxyethylene ether is 5%-10%, and the balance is water.

[0022] In the present application, the corn field herbicide membrane application synergist is a uniform colorless transparent viscous liquid, has high physical stability, and is not prone to delamination, and belongs to a soluble liquid agent.

[0023] In the present application, the corn field herbicide membrane application synergist has a viscosity of 800-900 mPa·s and a water solution surface tension of 30-32 N / m.

[0024] The preparation method of the above herbicide synergist comprises the following steps: the above raw material components are proportioned, stirred, and uniformly mixed to form a uniform colorless transparent liquid.

[0025] In the present application, the corn field herbicide membrane application synergist is added in an amount of 25-30 mL per 100 g of corn field herbicide. Research has found that when the amount of the synergist added in 100 g of corn field herbicide is less than 25 mL, the membrane application and the herbicide under the membrane do not achieve a relatively optimal effect; and when the amount of the synergist added in 100 g of corn field herbicide exceeds 30 mL, there is a risk of phytotoxicity, and the corn appears leaf yellowing and other phenomena.

[0026] The above synergist is applied in corn post-emergence membrane application herbicide. The herbicide synergist mainly focuses on the use of selective herbicides in corn fields and the like in film-covered plots, and the addition of the component can play a role in spraying on the film and killing weeds under the film, and the use method is basically consistent with the conventional spraying time, and is suitable for post-emergence weeding. It is used for film application on polyethylene and polyhydroxy fatty acid ester material agricultural mulch film. The film thickness of the applicable mulch film is 0.008-0.01 mm.

[0027] Further, the synergist is applied in corn post-emergence membrane application herbicide, and is applied in corn 3-5 leaf stage membrane application herbicide.

[0028] Further, the synergist is applied in corn post-emergence membrane application herbicide, and is used to remove blackgrass, barnyard grass, dogtail, or lespedeza.

[0029] The corn field herbicide film application synergistic adjuvant has the advantages that the corn field herbicide can be fully distributed, uniformly retained for a long time and penetrated on the film, the effect of spraying the herbicide on the film and weeding under the film is realized, and the synergistic effect is obvious when the herbicide is used in the corn field without film covering.

[0030] Meanwhile, the application adopts the green and environment-friendly degradable polymer surfactant component, is safe to the corn crops and harmless to the beneficial organisms under the recommended dosage. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The corn herbicide penetration experiment of spraying 30% nitrapyrin without the adjuvant and spraying 30% nitrapyrin with the adjuvant of example 1 respectively, the comparison of weed growth of the experimental samples with film covering and without film covering on the 15th day.

[0032] Figure 2 The corn herbicide penetration experiment of spraying 30% nitrapyrin without the adjuvant and spraying 30% nitrapyrin with the adjuvant of example 1 respectively, the comparison of weed growth of the experimental samples with film covering on the 15th day (top view).

[0033] Figure 3 The corn herbicide penetration experiment of spraying 37% mesotrione + atrazine without the adjuvant and spraying 37% mesotrione + atrazine with the adjuvant of example 1 respectively, the comparison of weed growth of the experimental samples with film covering and without film covering on the 15th day.

[0034] Figure 4 The corn herbicide penetration experiment of spraying 37% mesotrione + atrazine without the adjuvant and spraying 37% mesotrione + atrazine with the adjuvant of example 1 respectively, the comparison of weed growth of the experimental samples with film covering on the 15th day (top view). DETAILED DESCRIPTION

[0035] The application will be further described below in combination with specific examples. The reagents used in the specific embodiments are all commercially available products.

[0036] Example 1

[0037] The corn field herbicide film application synergistic adjuvant is composed of the following raw materials in mass percentage: 30% lauryl alcohol polyoxyethyl (5) ether glucoside, 20% potassium tridecyl ethyl sulfonate, 5% ethoxy modified trisiloxane (polymerization degree is 5-7), 8% lauryl alcohol polyether-5, and the rest is water.

[0038] Example 2

[0039] The corn field herbicide film application synergist is composed of the following raw materials in mass percentage: 15% lauryl alcohol polyoxyethylene (3) ether glucoside, 30% potassium cetyl ethyl sulfonate, 8% ethoxy modified trisiloxane (polymerization degree 5-7), 10% lauryl alcohol polyoxylether-5, and the balance is water.

[0040] Example 3

[0041] The corn field herbicide film application synergist is composed of the following raw materials in mass percentage: 40% myristyl alcohol polyoxyethylene (7) ether glucoside, 40% potassium pentadecyl ethyl sulfonate, 1% ethoxy modified trisiloxane (polymerization degree 5-7), 5% myristyl alcohol polyoxylether-7, and the balance is water.

[0042] Example 4

[0043] The corn field herbicide film application synergist is composed of the following raw materials in mass percentage: 15% lauryl alcohol polyoxyethylene (3) ether glucoside, 30% potassium cetyl ethyl sulfonate, 8% ethoxy modified trisiloxane (polymerization degree 5-7), 10% lauryl alcohol polyoxylether-5, and the balance is water.

[0044] Example 5

[0045] The corn field herbicide film application synergist is composed of the following raw materials in mass percentage: 25% lauryl alcohol polyoxyethylene (3) ether glucoside, 30% potassium cetyl ethyl sulfonate, 8% ethoxy modified trisiloxane (polymerization degree 5-7), 10% lauryl alcohol polyoxylether-5, and the balance is water.

[0046] Comparative Example 1

[0047] The synergist of the present comparative example is different from that of Example 1 in that the fatty alcohol polyoxyethylene ether glucoside is lauryl alcohol polyoxyethylene (9) ether glucoside; and the fatty alcohol polyoxyethylene ether is lauryl alcohol polyoxylether-9.

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

[0049] Comparative Example 2

[0050] The synergist of the present comparative example is different from that of Example 1 in that the fatty alcohol polyoxyethylene ether glucoside is lauryl alcohol polyoxyethylene (9) ether glucoside; and the fatty alcohol polyoxyethylene ether is lauryl alcohol polyoxylether-9.

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

[0052] Comparative Example 3

[0053] The synergist of the present comparative example is different from that of Example 1 in that the fatty alcohol polyoxyethylene ether glucoside is lauryl alcohol polyoxyethylene (9) ether glucoside; and the fatty alcohol polyoxyethylene ether is lauryl alcohol polyoxylether-9.

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

[0055] Comparative Example 4

[0056] The synergistic adjuvant of the present comparative example differs from that of Example 1 in that the synergistic adjuvant consists of the following raw materials in mass percentage: 45% laureth-5 glucoside, 20% potassium tridecyl ethyl sulfonate, 5% ethoxy-modified trisiloxane (polymerization degree 5-7), 15% laureth-5, and the balance being water.

[0057] Experimental Example 1

[0058] The following is a test of the penetration of the corn field herbicide.

[0059] I. Purpose of the Test

[0060] To verify the effect of the synergistic adjuvant on the weeds in the film in the corn field mulching, and to verify the penetration of the adjuvant in the mulching film.

[0061] II. Test Items

[0062] 1. Test Agent: 37% nicosulfuron + atrazine purchased on the market; 30% nitrapyrin purchased on the market. Among them, 37% nicosulfuron + atrazine is purchased from Shandong Lüde Di Biological Technology Co., Ltd.; 30% nitrapyrin is purchased from Heze Maotai Rui Agricultural Biological Technology Co., Ltd.

[0063] 2. Synergistic Adjuvant: The synergistic adjuvant described in each example and comparative example.

[0064] 3. Test Weeds: blackgrass, barnyard grass, goosegrass, and leafflower.

[0065] III. Experimental Scheme

[0066] Potting method is adopted, and the corn is sprayed at the 5-leaf stage. The dosage of the herbicide is reduced in the same proportion, and it is calculated that 1 g of herbicide needs to be diluted by 128 times, and 30 mL of synergistic adjuvant needs to be diluted by 500 times. After the herbicide and the adjuvant are diluted according to the above proportions, 2.5 g of diluted herbicide and 1 mL of diluted adjuvant are taken respectively, mixed uniformly, and sprayed uniformly on the corn or mulching film. The mulching film used in the potting is polyethylene material with a thickness of 0.01 mm.

[0067] The effects on common weeds inside and outside the film are compared, and the safety to corn is compared.

[0068] IV. Experimental Results and Analysis

[0069] (1) The first three days: In the first three days, the weeds have no obvious change, mostly a little wilted and dry tip.

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

[0071] (1) The first three days: In the first three days, the weeds have no obvious change, mostly a little wilted and dry tip.

[0072] (2) The tenth day: The weeds in the experimental group with added adjuvant have begun to dry up and die obviously.

[0073] (3) The fifteenth day: Figures 1-4 It can be seen that after fifteen days, the weeds in the experimental group with added adjuvant of Example 1 are all dry and dead.

[0074] And in the experimental group without added adjuvant, the weeds in the two mulched experimental products are still lush except for the dry leaves of the weeds at the opening that are contaminated with the drug.

[0075] Through the comparative analysis shown in the figure, it can be seen that the penetration of the herbicide liquid is obviously enhanced after adding the synergistic adjuvant, and the weeds under the film also have strong killing properties. The killing effect on weeds without mulching is better, and the effect of the drug is greatly improved after adding.

[0076] 2. Weed control efficiency

[0077] Weed control efficiency (%) = [(blank control group weed number - experimental group weed number) / blank control group weed number] x 100.

[0078] ① The herbicidal effect - weed control efficiency of each test pesticide on the third day, the tenth day and the fifteenth day after mulching spraying, please see Table 1.

[0079] Table 1: Potted state: mulching

[0080]

[0081]

[0082] 2. The herbicidal effect - weed control efficiency of each test pesticide on the third day, the tenth day and the fifteenth day after mulching spraying, please see Table 2.

[0083] Table 2: Potted state: not mulching

[0084]

[0085]

[0086] (II) Safety: After the application, the growth of corn was observed to evaluate the safety of each test agent to corn.

[0087] ① The growth of corn on the third day, the tenth day and the fifteenth day after spraying each test agent under the mulching condition was shown in Table 3.

[0088] Table 3 Potting state: mulching

[0089]

[0090]

[0091] ② The growth of corn on the third day, the tenth day and the fifteenth day after spraying each test agent under the non-mulching condition was shown in Table 4.

[0092] Table 4 Potting state: non-mulching

[0093]

[0094]

Claims

1. A synergistic adjuvant for use in the application of herbicide barrier membranes in corn fields, characterized in that it comprises: The raw materials consist of fatty alcohol polyoxyethylene glycoside, alkyl ethyl sulfonate, ethoxy modified trisiloxane, fatty alcohol polyoxyethylene ether and water; According to the mass percentage, the content of each raw material component is as follows: the fatty alcohol polyoxyethylene glycoside is 15%-40%, the alkyl ethyl sulfonate is 20%-40%, the ethoxy modified trisiloxane is 1%-8%, the fatty alcohol polyoxyethylene ether is 5%-10%, and the balance is water; The molecular structural formula of the fatty alcohol polyoxyethylene ether glucoside is: R (OCH2CH2) n O G, wherein R is a C 12 - C 18 fatty alcohol chain, G is a glucoside, and n is 3, 5, or 7. The molecular structural formula of the alkyl ethyl sulfonate is: R-CH2CH2-SO3 - M + In the formula, R is C 13 -C 16 alkyl group, M + It 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: R-O-(CH2CH2O) n -H, wherein R is C 12 -C 18 a fatty alcohol chain, n is 3, 5 or 7; The herbicide suitable for the synergistic adjuvant is 30% nitro-amine or 37% atrazine·atrazine.

2. The corn field herbicide barrier applicator synergist of claim 1, wherein, The fatty alcohol polyoxyethylene glycoside is selected from any one of lauryl alcohol polyoxyethylene (3) ether glycoside, lauryl alcohol polyoxyethylene (5) ether glycoside, lauryl alcohol polyoxyethylene (7) ether glycoside, myristyl alcohol polyoxyethylene (3) ether glycoside, myristyl alcohol polyoxyethylene (5) ether glycoside, myristyl alcohol polyoxyethylene (7) ether glycoside, palmityl alcohol polyoxyethylene (3) ether glycoside, palmityl alcohol polyoxyethylene (5) ether glycoside, palmityl alcohol polyoxyethylene (7) ether glycoside, stearyl alcohol polyoxyethylene (3) ether glycoside, stearyl alcohol polyoxyethylene (5) ether glycoside or stearyl alcohol polyoxyethylene (7) ether glycoside.

3. The corn field herbicide barrier applicator synergist of claim 1, wherein, The fatty alcohol polyoxyethylene ether is selected from any one of lauryl alcohol polyether-3, lauryl alcohol polyether-5, lauryl alcohol polyether-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.

4. The corn field herbicide barrier applicator synergist of claim 1, wherein, The synergistic adjuvant is a uniform colorless transparent viscous liquid.

5. The corn field herbicide barrier applicator synergist of claim 4, wherein, The viscosity of the synergistic adjuvant is 800-900 mPa·s, and the surface tension of the aqueous solution is 30-32 N / m.

6. The corn field herbicide barrier applicator booster of any one of claims 1-5, wherein, 25-30 mL of the synergistic adjuvant is added to every 100 g of corn field herbicide.

7. The use of the corn field herbicide membrane application synergistic adjuvant in corn post-emergence membrane application herbicides according to any one of claims 1-5.

8. Use of the cornfield herbicide film applicator synergist of claim 7 in post-emergence film application weed control in corn, characterized in that, In the application of corn 3-5 leaf stage membrane application herbicides.

9. Use of the corn field herbicide film applicator synergist of claim 7 in post-emergence film application weed control in corn, characterized by, For removing blackgrass, barnyardgrass, dogtail or lespedeza.

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