Suspending agent containing cyflumetofen and bifenazate

Abstract

The invention provides a suspending agent containing cyflumetofen and bifenazate, which is characterized by comprising the following components in percentage by mass: 15-25% of cyflumetofen, 15-25% of bifenazate, 2-4% of dispersing agent, 2-4% of wetting agent, 0.5-1% of thickening agent, 3-6% of stabilizer, 3-7% of antifreezing agent, 0.5-0.8% of defoaming agent and the balance of water. According to the suspending agent containing cyflumetofen and bifenazate provided by the invention, the dispersing agent, the wetting agent and the thickening agent are screened and matched with the specific stabilizer, so that the stability and the control effect of the cyflumetofen-bifenazate suspending agent are remarkably improved on the basis that various indexes meet the standard of a qualified suspending agent.

Description

Technical Field

[0001] The invention belongs to the field of pesticide preparations, and particularly relates to a suspension containing cyfluthrin and bifenazate. Background Art

[0002] Cyflumetofen is a new type of benzoylacetonitrile acaricide developed by Otsuka Pharmaceutical Co., Ltd. of Japan. It is currently mainly used to control mites on fruit trees, vegetables, tea and ornamental plants. It has no cross-resistance with existing insecticides and has a good preventive effect on citrus red spider mites.

[0003] Bifenazate is a representative agent for controlling citrus red spider mites. Bifenazate has a unique effect on the γ-aminobutyric acid receptors of the central nervous system of mites, is effective against all life stages of mites, especially has strong egg-killing activity and knockdown activity against adult mites, and is safe for crops at the recommended concentration.

[0004] In order to solve the stability problem commonly existing in the pesticide suspension in the prior art and to further improve the efficacy of the preparation, the present invention has developed a suspension formulation containing cyfluthrin and bifenazate with high stability and good protective effect. Summary of the invention

[0005] The present invention provides a suspension containing cyflumetofen and bifenazate, and the specific technical scheme is as follows:

[0006] A suspension containing cyflumetofen and bifenazate, characterized in that it comprises the following components in percentage by mass: 15-25% of cyflumetofen, 15-25% of bifenazate, 2-4% of a dispersant, 2-4% of a wetting agent, 0.5-1% of a thickener, 3%-6% of a stabilizer, 3-7% of an antifreeze agent, 0.5-0.8% of a defoamer, and the balance of water.

[0007] The dispersant is one of polycarboxylate dispersants K77S, CP-9 or phosphate dispersant PEAS 03; preferably, the dispersant is polycarboxylate dispersant K77S.

[0008] The wetting agent is a combination of a sulfate wetting agent YUS-SXC and a nonionic hydroxy polyethylene oxide block copolymer wetting agent 500-LQ, wherein the mass ratio of YUS-SXC to 500-LQ is 2:3; or, the wetting agent is a combination of a sulfate wetting agent SP-4099 and a nonionic hydroxy polyethylene oxide block copolymer wetting agent 500-LQ, wherein the mass ratio of SP-4099 to 500-LQ is 2:3.

[0009] Preferably, the wetting agent is a combination of a sulfate wetting agent YUS-SXC and a nonionic hydroxy polyethylene oxide block copolymer wetting agent 500-LQ, wherein the mass ratio of YUS-SXC to 500-LQ is 2:3.

[0010] The thickener is a combination of polyvinyl alcohol and sodium alginate, wherein the mass ratio of polyvinyl alcohol to sodium alginate is 1:2; or, the thickener is a combination of polyvinyl alcohol and guar gum, wherein the mass ratio of polyvinyl alcohol to sodium alginate is 1:2;

[0011] Preferably, the thickener is a combination of polyvinyl alcohol and sodium alginate, wherein the mass ratio of polyvinyl alcohol to sodium alginate is 1:2.

[0012] The stabilizer is bentonite or light calcium carbonate; preferably, the stabilizer is bentonite.

[0013] The antifreeze agent is one or more of urea and polyethylene glycol; preferably, the antifreeze agent is urea.

[0014] The defoaming agent is one or more of an organosilicon defoaming agent and a polyether defoaming agent; preferably, the defoaming agent is an organosilicon defoaming agent.

[0015] The invention provides a method for preparing the above-mentioned cyflumetofen and bifenazate suspension, which comprises: mixing a wetting agent, a dispersant and an antifreeze agent with water according to the formula amount to obtain a mixed solution 1; adding cyflumetofen, bifenazate, a thickener and a stabilizer to the mixed solution 1, and uniformly dispersing to obtain a mixed solution 2; grinding the mixed solution 2 until the material particle size D90 is less than 4 μm to obtain the suspension.

[0016] The present invention also provides an application of a suspension containing cyflumetofen and bifenazate in preventing and controlling citrus red spider mites.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The suspension containing cyflumetofen and bifenazate provided by the present invention is prepared by screening a dispersant, a wetting agent and a thickener, and mixing with a specific stabilizer. On the basis of preparing a suspension having various indices meeting the standards of a qualified suspension, the stability and control effect of the suspension of cyflumetofen and bifenazate are significantly improved by mixing with a specific type of auxiliary agent. DETAILED DESCRIPTION

[0019] The present invention can be better understood according to the following examples. However, it is easy for those skilled in the art to understand that the contents described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0020] Polycarboxylate dispersants K77S, CP-9, and phosphate dispersant PEAS 03 were purchased from Solvay and BASF, respectively; sulfate wetting agents YUS-SXC, SP-4099, and nonionic hydroxy polyethylene oxide block copolymer wetting agent 500-LQ were purchased from Jieshi Chemical, Jiangsu, and Aksu, respectively; the remaining technical materials, thickeners, stabilizers, antifreeze agents, and defoaming agents were all conventional commercial products.

[0021] Formulation Examples :

[0022] According to the suspension concentrate formula in Table 1, 40% cyfluthrin-bifenazate suspension concentrates of Examples 1-8 with different auxiliary agent compositions were prepared.

[0023] The corresponding preparation properties are measured according to relevant standards or common methods, see Table 2 for details.

[0024] Table 3 shows the field efficacy test of 40% cyfluthrin-bifenazate suspension with different adjuvant compositions for controlling citrus red spider mites in Examples 1-8, which was conducted with reference to "GB / T17980.11-2000 Guidelines for Field Efficacy Tests of Pesticides".

[0025] Table 1 Formulation of 40% cyfluthrin-bifenazate suspension concentrate with different adjuvant compositions

[0026]

[0027]

[0028] Table 2 Performance of 40% cyfluthrin-bifenazate suspension concentrate with different adjuvant compositions

[0029]

[0030]

[0031] Table 3 Control effect of 40% cyfluthrin-bifenazate suspension of Examples 1-8 on citrus red spider mites

[0032]

[0033] From Tables 1-3, it can be seen that the combined use of specific dispersants, wetting agents, thickeners and stabilizers in the formulations of Examples 1-3 significantly improved the formulation stability and control efficacy of the 40% cyfluthrin-bifenazate suspension.

[0034] According to Table 1-2, compared with Examples 4-8, the 40% cyflumetofen·bifenazate suspension of Example 1-3 has a higher suspension rate, a better stable suspension rate after heat storage, and a lower water precipitation amount. It can be seen that the use of specific dispersants, wetting agents, thickeners and stabilizers makes the 40% cyflumetofen·bifenazate suspension prepared in Example 1-3 more stable. According to Table 3, compared with Examples 4-8, the 40% cyflumetofen·bifenazate suspension of Example 1-3 with better formulation stability also has better prevention effect on citrus red spider mites.

[0035] The above description is only a preferred embodiment of the present invention. For those skilled in the art, appropriate improvements can be made without departing from the raw materials of the present invention, and these improvements are also within the scope of protection of the present invention.

Claims

1. A suspension containing cyfluthrin and bifenazate, characterized in that: The composition comprises the following components in percentage by weight: 15-25% of cyfluthrin, 15-25% of bifenazate, 2-4% of dispersant, 2-4% of wetting agent, 0.5-1% of thickener, 3%-6% of stabilizer, 3-7% of antifreeze agent, 0.5-0.8% of defoamer, and the balance of water; The dispersant is a polycarboxylate dispersant K77S; The wetting agent is a combination of a sulfate wetting agent YUS-SXC and a nonionic hydroxy polyethylene oxide block copolymer wetting agent 500-LQ, wherein the mass ratio of YUS-SXC to 500-LQ is 2:3; The thickener is a combination of polyvinyl alcohol and sodium alginate, wherein the mass ratio of polyvinyl alcohol to sodium alginate is 1:2; The stabilizer is bentonite.

2. The suspension concentrate containing cyfluthrin and bifenazate according to claim 1, wherein the antifreeze agent is one or more of urea and polyethylene glycol.

3. The suspension concentrate containing cyfluthrin and bifenazate according to claim 1 or 2, characterized in that: The defoaming agent is one or more of an organosilicon defoaming agent and a polyether defoaming agent.

4. A method for preparing the suspension concentrate containing cyfluthrin and bifenazate according to any one of claims 1 to 3, comprising: According to the formula, the wetting agent, the dispersant and the antifreeze agent are mixed with water to obtain a mixed solution 1; Add cyflumetofen, bifenazate, a thickener and a stabilizer to the mixed solution 1, and disperse them uniformly to obtain a mixed solution 2; grind the mixed solution 2 until the particle size D90 is less than 4 μm to obtain the suspension.

5. Use of the suspension concentrate containing cyflumetofen and bifenazate according to any one of claims 1 to 3 or the suspension concentrate containing cyflumetofen and bifenazate prepared according to the preparation method of claim 4 in controlling citrus red spider mites.

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