High-stability pyraclostrobin suspending agent and preparation method thereof

Abstract

The invention relates to the technical field of pesticides, and provides a high-stability pyraclostrobin suspending agent and a preparation method thereof. The high-stability pyraclostrobin suspending agent is prepared from pyraclostrobin, a dispersing agent, a wetting agent, a thickening agent and water, and the dispersing agent is trifluoride containing hydroxyl. Through the technical scheme, the problem of poor stability of the nanoscale pyraclostrobin suspending agent with good pesticide effect in the related technology is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pesticides, and in particular to a high-stability pyraclostrobin suspension and a preparation method thereof. Background Art

[0002] Pyraclostrobin is a methoxyacrylate fungicide with a wider fungicide spectrum and higher fungicide activity. It also has protective, therapeutic and radical effects, such as: ① improving crop quality, increasing chlorophyll content, enhancing photosynthesis and carbohydrate accumulation; ② improving crop stress resistance; ③ increasing fruit setting rate; ④ acting quickly and lasting for a long time. Due to the above advantages, it is often used as a pesticide.

[0003] Pesticide formulations can be selected from environmentally friendly formulations such as suspensions, microcapsule suspensions, aqueous solutions, emulsions in water, microemulsions, granules, water-dispersible granules and soluble granules, among which suspensions are the most commonly used pesticide formulations.

[0004] In the field of pesticides, the smaller the particle size of the suspension, the better the effect of the pesticide. Therefore, nano-scale suspensions are generally developed. However, although nano-scale suspensions have good efficacy, they generally have the problem of poor stability. Summary of the invention

[0005] The invention provides a high-stability pyraclostrobin suspension and a preparation method thereof, which solves the problem of poor stability of a nano-scale pyraclostrobin suspension with good efficacy in the related art.

[0006] The technical solution of the present invention is as follows: A high-stability pyraclostrobin suspension, the raw materials of which include pyraclostrobin, a dispersant, a wetting agent, a thickener and water, wherein the dispersant is a trifluoride containing a hydroxyl group.

[0007] The trifluoride containing a hydroxyl group in the present invention may be any compound containing a hydroxyl group and three fluorine atoms attached to the same carbon.

[0008] As a further technical solution, the raw materials also include antifreeze and defoaming agent.

[0009] As a further technical solution, the raw materials are composed of the following components in percentage by mass: 25% to 30% of pyraclostrobin, 5% to 10% of a dispersant, 1% to 3% of a wetting agent, 0.4% to 0.8% of a thickener, 1% to 5% of an antifreeze agent, 0.1% to 0.3% of a defoaming agent, and the balance of water.

[0010] As a further technical solution, the dispersant includes 2,2,2-trifluoroethanol and / or 4-(trifluoromethyl)benzyl alcohol.

[0011] As a further technical solution, the dispersant is composed of 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol in a ratio of 1:9 to 9:1 by mass percentage.

[0012] The present invention optimizes the dispersant to 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol in a mass ratio of 1:9 to 9:1, thereby further improving the thermal stability of the pyraclostrobin suspension.

[0013] As a further technical solution, in terms of mass percentage, the amount of 2,2,2-trifluoroethanol is ≤ the amount of 4-(trifluoromethyl)benzyl alcohol.

[0014] The invention limits the mass of 2,2,2-trifluoroethanol to less than or equal to the mass of 4-(trifluoromethyl)benzyl alcohol, thereby further improving the thermal stability of the pyraclostrobin suspension.

[0015] As a further technical solution, the dispersant is composed of 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol in a ratio of 7:3 by mass percentage.

[0016] The present invention limits the mass ratio of 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol to 7:3 as the dispersant, and further improves the thermal stability of the pyraclostrobin suspension.

[0017] As a further technical solution, the wetting agent includes one or two of alkyl naphthalene sulfonate and alkylphenol polyoxyethylene ether; The thickener includes one or two of xanthan gum and magnesium aluminum silicate.

[0018] As a further technical solution, the antifreeze agent includes one or more of ethylene glycol, propylene glycol, and glycerol; The defoamer is an organosilicon defoamer.

[0019] The invention also provides a method for preparing a high-stability pyraclostrobin suspension, which comprises the following steps: mixing raw materials uniformly and then sand-milling to obtain the pyraclostrobin suspension.

[0020] As a further technical solution, the mixing time is 60 to 90 minutes.

[0021] The working principle and beneficial effects of the present invention are: The invention provides a pyraclostrobin suspension with good stability. The pyraclostrobin, dispersant, wetting agent, thickener and water are used as part of the raw materials, wherein the dispersant is a trifluoride containing a hydroxyl group. The prepared pyraclostrobin suspension can be nanometer-level, has good efficacy, and has good thermal stability. The suspension rate before and after heat storage is about 95%, and the fluidity is normal after processing and heat storage, and crystallization and paste phenomenon will not occur. Compared with the traditional dispersant, the trifluoride containing a hydroxyl group is better when used as a dispersant, and the thermal stability of the pyraclostrobin suspension can be improved. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0023] The parameters of the raw materials in the following examples and comparative examples are as follows: The alkylnaphthalene sulfonate is Petro 22N sodium alkylnaphthalene sulfonate; The alkylphenol polyoxyethylene ether is nonylphenol polyoxyethylene ether; The defoaming agent is MOMENTIVE SAG 1572 silicone defoaming agent.

[0024] Example 1 According to mass percentage, 30% of pyraclostrobin, 10% of 4-(trifluoromethyl)benzyl alcohol, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0025] Example 2 According to mass percentage, 25% of pyraclostrobin, 5% of 4-(trifluoromethyl)benzyl alcohol, 1% of alkylphenol polyoxyethylene ether, 0.4% of xanthan gum, 1% of ethylene glycol, 0.1% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 60 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0026] Example 3 According to mass percentage, 30% of pyraclostrobin, 10% of 2,2,2-trifluoroethanol, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0027] Example 4 According to mass percentage, 30% of pyraclostrobin, 9% of 2,2,2-trifluoroethanol, 1% of 4-(trifluoromethyl)benzyl alcohol, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0028] Example 5 According to mass percentage, 30% of pyraclostrobin, 5% of 2,2,2-trifluoroethanol, 5% of 4-(trifluoromethyl)benzyl alcohol, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0029] Example 6 According to mass percentage, 30% of pyraclostrobin, 3% of 2,2,2-trifluoroethanol, 7% of 4-(trifluoromethyl)benzyl alcohol, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0030] Example 7 According to mass percentage, 30% of pyraclostrobin, 1% of 2,2,2-trifluoroethanol, 9% of 4-(trifluoromethyl)benzyl alcohol, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0031] Comparative Example 1 According to mass percentage, 30% of pyraclostrobin, 10% of Croda 7500 carboxylate dispersant, 3% of alkylnaphthalene sulfonate, 0.3% of xanthan gum, 0.5% of magnesium aluminum silicate, 5% of propylene glycol, 0.3% of defoamer and the balance of water were mixed, homogenized and dispersed at 1500 rpm for 90 minutes, and then sand-milled to obtain a pyraclostrobin suspension.

[0032] The pyraclostrobin suspension concentrate obtained in Examples 1 to 7 and Comparative Example 1 was tested for initial particle size D98 and particle size D98 after storage at 54±2°C for 14 days according to the method in GB T 19136-2021, and the change rate was calculated according to the following formula: Change rate (%) = (particle size D98 after storage at 54±2℃ for 14 days - initial particle size D98) ÷ initial particle size D98 × 100; The test results are recorded in Table 1.

[0033] Table 1 Thermal stability of pyraclostrobin suspension

[0034] It can be seen from Table 1 that the pyraclostrobin suspension concentrate provided by the present invention has good thermal stability.

[0035] Compared with Comparative Example 1, in Examples 1 to 7, the trifluoride containing a hydroxyl group is added as a dispersant, and the change rate of the obtained pyraclostrobin suspension after heat storage is lower than that in Comparative Example 1, indicating that compared with the traditional dispersant, the trifluoride containing a hydroxyl group is better as a dispersant and can improve the thermal stability of the pyraclostrobin suspension.

[0036] The change rate of the pyraclostrobin suspension obtained in Examples 4 to 7 after heat storage is lower than that in Example 1 and Example 3, indicating that the dispersant is 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol in a mass ratio of 1:9 to 9:1, which can further improve the thermal stability of the pyraclostrobin suspension.

[0037] The change rate of the pyraclostrobin suspension obtained in Examples 5 to 7 after heat storage is lower than that in Example 4, indicating that the mass of 2,2,2-trifluoroethanol is ≤ the mass of 4-(trifluoromethyl)benzyl alcohol, which can further improve the thermal stability of the pyraclostrobin suspension.

[0038] The change rate of the pyraclostrobin suspension obtained in Example 6 after heat storage is lower than that in Example 5 and Example 7, indicating that the mass ratio of 2,2,2-trifluoroethanol to 4-(trifluoromethyl)benzyl alcohol is 7:3, which can further improve the thermal stability of the pyraclostrobin suspension.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-stability pyraclostrobin suspension concentrate, characterized in that: The raw materials include pyraclostrobin, a dispersant, a wetting agent, a thickener and water, wherein the dispersant is a trifluoride containing a hydroxyl group.

2. A high-stability pyraclostrobin suspension concentrate according to claim 1, characterized in that: Raw materials also include antifreeze and defoaming agents.

3. A high-stability pyraclostrobin suspension according to claim 2, characterized in that: The raw materials are composed of the following components in percentage by mass: 25% to 30% of pyraclostrobin, 5% to 10% of a dispersant, 1% to 3% of a wetting agent, 0.4% to 0.8% of a thickener, 1% to 5% of an antifreeze agent, 0.1% to 0.3% of a defoaming agent and the balance of water.

4. A high-stability pyraclostrobin suspension concentrate according to claim 3, characterized in that: The dispersant includes 2,2,2-trifluoroethanol and / or 4-(trifluoromethyl)benzyl alcohol.

5. A high-stability pyraclostrobin suspension concentrate according to claim 4, characterized in that: In terms of mass percentage, the dispersant consists of 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol in a ratio of 1:9 to 9:

1.

6. A high-stability pyraclostrobin suspension concentrate according to claim 5, characterized in that: In terms of mass percentage, the amount of 2,2,2-trifluoroethanol is ≤ the amount of 4-(trifluoromethyl)benzyl alcohol.

7. A high-stability pyraclostrobin suspension concentrate according to claim 6, characterized in that: The dispersant is composed of 2,2,2-trifluoroethanol and 4-(trifluoromethyl)benzyl alcohol in a ratio of 7:3 by mass percentage.

8. A high-stability pyraclostrobin suspension concentrate according to any one of claims 1 to 7, characterized in that: The wetting agent includes one or two of alkyl naphthalene sulfonate and alkylphenol polyoxyethylene ether; The thickener includes one or two of xanthan gum and magnesium aluminum silicate.

9. A high-stability pyraclostrobin suspension according to any one of claims 2 to 7, characterized in that: The antifreeze agent includes one or more of ethylene glycol, propylene glycol, and glycerol; The defoamer is an organosilicon defoamer.

10. The method for preparing a high-stability pyraclostrobin suspension concentrate according to any one of claims 1 to 9, characterized in that: The following steps are involved: The raw materials are mixed evenly and then sand-milled to obtain a pyraclostrobin suspension.

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