A pyrethroid suspension, preparation method and application thereof

Abstract

The present invention relates to a pyrethroid suspension, a preparation method and application thereof, and belongs to the technical field of pesticides. The pyrethroid suspension of the present invention comprises the following raw materials by mass percentage: 0.1-30.0% active ingredient, 1.0-10.0% polymer composite auxiliary agent, 1.0-10.0% wetting agent, 0.5-10.0% dispersant, 0.5-10.0% thickener, 1.0-10.0% antifreeze agent, 0.1-1.0% defoamer, 0.1-1.0% preservative, and water supplemented to 100%. The suspension uses a polymer composite auxiliary agent, optimizes the auxiliary agent combination, and uses fermented cellulose and a variety of thickeners to make the suspension achieve synergistic, stable, and easy-to-disperse effects at low viscosity.

Description

Technical Field

[0001] The invention relates to a pyrethroid suspension, a preparation method and application thereof, and belongs to the technical field of pesticides. Background Art

[0002] Pyrethroid pesticides are a class of synthetic insecticides that simulate the chemical structure of natural pyrethroids. They are widely used in agricultural and sanitary pest control due to their high efficiency, low toxicity, and low residue. According to industry research reports, the market capacity of pyrethroid pesticides in China reached tens of billions of yuan in 2023, and the global market capacity is even larger. It is expected to grow at a certain annual compound growth rate in the next few years and reach a higher market capacity in 2029. With the increase in global environmental awareness, suspension concentrates, as a water-based preparation, have gradually replaced traditional oil-based preparations and powdered preparations and become the development direction of pesticide formulations. Suspension concentrates have good fluidity, dispersibility, spreadability, and high biological activity; they do not use any organic solvents, do not generate dust, and are safe for operators, users, and the environment; they are easy to dilute, mix, and measure during application, and have low production costs. Domestically produced suspension concentrate products still have poor physical stability, especially stratification and precipitation during storage. According to Stokes' law, in order to slow down the sedimentation rate of pesticide particles, some manufacturers choose to increase the viscosity to delay the stratification of suspension products during storage. However, high-viscosity suspensions are prone to agglomeration and have poor dispersibility in water. After dilution, the molecules of the liquid medicine are not uniform and stable, which affects the spreading and penetration of the liquid medicine on the target surface, resulting in reduced efficacy. Summary of the invention

[0003] The purpose of the present invention is to address the defects of the prior art, propose a pyrethroid suspension, a preparation method and application thereof, use a polymer composite auxiliary agent, optimize the auxiliary agent combination, and preferably match a multi-combination thickener, so that the suspension can achieve the effects of synergism, storage stability and easy dispersion at low viscosity.

[0004] The present invention solves the technical problem through the following technical scheme: The present invention provides a pyrethroid suspension, which is prepared from the following raw materials in the following mass ratio: 0.1-30.0% of active ingredient, 1.0-10.0% of polymer composite auxiliary agent, 1.0-10.0% of wetting agent, 0.5-10.0% of dispersant, 0.5-10.0% of thickener, 1.0-10.0% of antifreeze agent, 0.1-1.0% of defoaming agent, 0.1-1.0% of preservative, and water supplemented to 100%.

[0005] Furthermore, the pyrethroid suspension is prepared from the following raw materials in the following mass ratio: active ingredient 0.1-20.0%, polymer composite auxiliary agent 1.0-3.0%, wetting agent 1.0-3.0%, dispersant 0.5-3.0%, thickener 3.0-7.0%, antifreeze agent 1.0-5.0%, defoaming agent 0.1-1.0%, preservative 0.1-1.0%, and water is supplemented to 100%.

[0006] The active ingredient is selected from at least one of cypermethrin, dextro-trans cypermethrin, chlorfenapyr, ethomethrin, deltamethrin, bifenthrin, high-efficiency cypermethrin, cis-cypermethrin, high-efficiency cypermethrin or high-efficiency cyhalothrin.

[0007] Furthermore, the active ingredient is selected from at least one of cypermethrin, dextro-trans cypermethrin, deltamethrin, high-efficiency cypermethrin, cis-cypermethrin or high-efficiency cypermethrin.

[0008] The polymer composite auxiliary agent is S-530.

[0009] The polymer composite auxiliary agent is S-530 produced by Suzhou Sendibo Chemical Technology Co., Ltd.

[0010] The wetting agent is selected from at least one of polyoxyethylene polyoxypropylene block polyether, alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.

[0011] The wetting agent is polyoxyethylene polyoxypropylene block polyether.

[0012] The polyoxyethylene polyoxypropylene block polyether wetting agent is PE10500.

[0013] The dispersant is selected from at least one of polycarboxylates, phosphate salts, lignin sulfonates, and alkyl naphthalene sulfonate formaldehyde condensates. Preferably, the dispersant is naphthalene sulfonate formaldehyde condensate Morwet-D425.

[0014] The thickener is selected from at least two of white carbon black, magnesium aluminum silicate, kaolin, attapulgite, xanthan gum, diutan gum, polyvinyl alcohol and fermented cellulose.

[0015] The thickener at least includes fermented cellulose.

[0016] The thickener fermented cellulose is R-88 from CPkelco.

[0017] The antifreeze agent is selected from at least one of ethylene glycol, propylene glycol, glycerol and urea, and more preferably at least one of ethylene glycol or glycerol.

[0018] The defoaming agent is selected from at least one of silicone, polyether-modified polysiloxane and polyoxypropylene glycerol ether defoaming agents; more preferably, it is an silicone defoaming agent.

[0019] The preservative is at least one selected from potassium sorbate, sodium benzoate, kasone and bronopol, and kasone is more preferred.

[0020] The particle size D90 of the suspending agent is ≤5.0 μm.

[0021] The second aspect of the present invention provides a method for preparing a pyrethroid suspension concentrate, comprising the following steps:

[0022] The first step is to mix the pesticide active ingredients, polymer composite adjuvant, wetting agent, dispersant, part of thickener, antifreeze agent, defoamer, preservative and appropriate amount of water in proportion and fully shear them evenly;

[0023] Step 2: Grind the mixed solution obtained in the above step to a particle size D90≤5.0 μm and filter it out;

[0024] Step 3: Add fermented cellulose and the remaining water to the filtrate obtained in step 2, and shear evenly to obtain the product.

[0025] In a third aspect, the present invention provides the use of the composition or the insecticide in pest control. The sanitary pests are mosquitoes and flies.

[0026] The beneficial effects of the present invention are reflected by the following features: the polymer composite adjuvant S-530 added to the suspension system of the present invention is a phospholipid-like amphiphilic ternary comb-type copolymer, which can be tightly adsorbed on the surface of pesticide particles and is not easy to fall off under high shear. At the same time, it gives the pesticide particles the dual effects of electrostatic repulsion and steric hindrance, can effectively control droplet aggregation, inhibit crystal growth, reduce viscosity during grinding, and play an emulsifying and dispersing role in the suspension system.

[0027] The present invention adds a novel thickener, fermented cellulose, to the suspension system to form a stable network-like three-dimensional structure in the suspension. Compared with conventional thickeners, fermented cellulose can provide suspension and dispersion performance without increasing the viscosity of the system. The inventors found in experiments that if only fermented cellulose is used as a thickener, the system cannot be kept suspended for a long time, and increasing the amount of fermented cellulose has no obvious effect; however, when other thickeners are used to adjust the system viscosity to ≥300mPa·s (2# rotor, 30rpm, 20°C), adding 3-5% of fermented cellulose can ensure that the system does not stratify water during hot storage and long-term storage at room temperature at a lower viscosity.

[0028] The suspension of the present invention has a small particle size, good storage stability, spontaneously disperses into an emulsion when entering water, and can be directly made into a spray liquid for use. At the same time, the auxiliary agent combination used in the present invention can greatly reduce the surface tension of the liquid medicine, improve the adhesion of the liquid medicine on the target, thereby achieving the effect of reducing the amount and increasing the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a graph showing the results of a water dispersibility test in one embodiment of the present invention.

[0030] Figure 2 This is a graph showing the results of a water dispersibility test of a comparative example of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described below by specific examples. The percentages in the following examples are all weight percentages unless otherwise specified; the following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are all commercially available products, among which the polymer composite additive S-530 is purchased from Suzhou Sendibo Chemical Technology Co., Ltd., and the thickener fermented cellulose R-88 is purchased from CPkelco, which will not be repeated.

[0032] Example 1

[0033] The components of 20% cyfluthrin-deltamethrin suspension are as follows:

[0034] Cypermethrin 5.0%, cypermethrin 15.0%, S-530 2.0%, PE10500 1.5%, Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 3.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0035] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0036] Example 2

[0037] The components of 20% cypermethrin-cypermethrin suspension are as follows:

[0038] Cypermethrin 6.0%, cypermethrin 14.0%, S-530 2.5%, PE10500 2.0%, Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 4.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, and deionized water to 100%.

[0039] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0040] Example 3

[0041] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0042] Cypermethrin 10.0%, cis-cypermethrin 10.0%, S-530 2.0%, PE10500 2.0%, Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 4.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0043] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0044] Example 4

[0045] The components of 20% cyfluthrin-cyhalothrin suspension are as follows:

[0046] Cypermethrin 8.0%, highly effective cypermethrin 12.0%, S-530 3.0%, PE10500 2.5%, Morwet D-425 1.5%, magnesium aluminum silicate 0.5%, diutan gum 0.08%, fermented cellulose 5.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kasone 0.20%, and deionized water is made up to 100%.

[0047] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0048] Example 5

[0049] The components of 20% D-trans-chlorpromazine·deltamethrin suspension are as follows:

[0050] 5.0% of right-rotating trans-chlorprophthrin, 15.0% of cypermethrin, 2.0% of S-530, 1.0% of PE10500, 0.5% of Morwet D-425, 0.5% of magnesium aluminum silicate, 0.15% of xanthan gum, 3.0% of fermented cellulose, 0.50% of silicone defoamer, 5.0% of ethylene glycol, 0.20% of kason, and make up to 100% with deionized water.

[0051] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0052] Example 6

[0053] The components of 20% D-trans-chlorpromazine·high-efficiency cypermethrin suspension are as follows:

[0054] Dextrorotatory trans-chlorprophmethrin 6.0%, highly effective cypermethrin 14.0%, S-530 2.0%, PE10500 2.0%, Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, diutan gum 0.07%, fermented cellulose 3.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kasone 0.20%, and deionized water to 100%.

[0055] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0056] Example 7

[0057] The components of 20% D-trans-chlorpromazine·cis-cypermethrin suspension concentrate are as follows:

[0058] 10.0% of right-handed trans-chlorprophmethrin, 10.0% of cis-cypermethrin, 2.0% of S-530, 1.5% of PE10500, 0.5% of Morwet D-425, 0.5% of magnesium aluminum silicate, 0.15% of xanthan gum, 4.0% of fermented cellulose, 0.50% of silicone defoamer, 5.0% of ethylene glycol, 0.20% of kason, and the amount is made up to 100% with deionized water.

[0059] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0060] Example 8

[0061] The components of 20% D-trans-chlorpromazine·cyhalothrin suspension are as follows:

[0062] Dextrorotatory trans-chlorpromazine 8.0%, highly effective chlorfenapyr 12.0%, S-530 2.5%, PE10500 1.5%, Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 5.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kasone 0.20%, and deionized water to 100%.

[0063] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0064] Comparative Example 1

[0065] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0066] Cypermethrin 10.0%, cis-cypermethrin 10.0%, polycarboxylate 2.5%, PE105001.5%, MorwetD-4251.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 4.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0067] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0068] Comparative Example 2

[0069] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0070] Cypermethrin 10.0%, cis-cypermethrin 10.0%, fatty alcohol polyether 2.0%, PE105002.0%, Morwet D-4251.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 4.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0071] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0072] Comparative Example 3

[0073] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0074] Cypermethrin 10.0%, cis-cypermethrin 10.0%, S-530 2.0%, PE10500 2.0%, Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0075] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0076] Comparative Example 4

[0077] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0078] Cypermethrin 10.0%, cis-cypermethrin 10.0%, S-530 2.0%, PE105002.0%,

[0079] Morwet D-425 1.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.15%, fermented cellulose 1.0%, silicone defoamer 0.50%, ethylene glycol 5.0%, Kathon 0.20%, deionized water to 100%.

[0080] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0081] Comparative Example 5

[0082] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0083] Cypermethrin 10.0%, cis-cypermethrin 10.0%, S-530 2.0%, PE105002.0%, MorwetD-4251.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.20%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0084] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0085] Comparative Example 6

[0086] The components of 20% cypermethrin-cis-cypermethrin suspension are as follows:

[0087] Cypermethrin 10.0%, cis-cypermethrin 10.0%, S-530 2.0%, PE105002.0%, MorwetD-4251.0%, magnesium aluminum silicate 0.5%, xanthan gum 0.30%, silicone defoamer 0.50%, ethylene glycol 5.0%, kason 0.20%, deionized water to 100%.

[0088] Preparation method: After mixing the wetting dispersant, antifreeze agent, preservative, defoamer, part of the thickener and deionized water, use a high shear dispersing emulsifier to shear for 3-5 minutes, use wet sand grinding to D90≤5.0μm, filter the material, add the remaining thickener and water, and shear and disperse evenly.

[0089] Test Example 1 Determination of quality technical indicators of the suspension composition of the present invention

[0090] 1. Determination of particle size and distribution

[0091] The particle size distribution of the suspension was measured using a particle size analyzer, with the D90 measurement result used as the benchmark.

[0092] 2. Suspension rate determination

[0093] The method was carried out according to CIPAC MT 184.

[0094] 3. Viscosity measurement

[0095] The viscosity of the suspension was measured with a rotational viscometer, with the readings at rotor #2, 30 rpm, and 20°C as the reference.

[0096] 4. Determination of water dispersibility

[0097] In a 250mL measuring cylinder, add 249mL of water and 1mL of the predicted suspension sample measured with a syringe, and drop it into the water from 5cm above the water surface of the measuring cylinder to observe its dispersion. According to the dispersion quality, it is divided into three levels: excellent, good, and poor. Excellent: It automatically disperses in the water in the form of mist, and no visible particles sink. Good: It can automatically disperse in the water, and there are particles sinking. The sinking particles can be dispersed slowly or dispersed after slight shaking. Poor: It cannot automatically disperse in the water, sinks in the form of particles, and can only be dispersed after strong shaking.

[0098] 5. Low temperature stability determination

[0099] According to GB / T 19137-2003 pesticide low temperature stability test method. The sample is placed at (0 ± 2) ℃ for 1 hour, and the appearance is observed for changes. The test is continued at (0 ± 2) ℃ for 7 days. After 7 days, it is taken out and restored to room temperature for observation. The low temperature qualified indicators are: no stratification, solidification and agglomeration, etc., and the emulsion is uniform and flowable.

[0100] 6. Determination of thermal storage stability

[0101] The test was carried out according to the GB / T 19136-2003 method for determining the thermal storage stability of pesticides. The sample was placed at (54 ± 2)°C for 14 days. The qualified index for thermal storage was: no water precipitation, stratification, wall adhesion, solidification, etc., and the emulsion was uniform and flowable. The results are shown in Table 1.

[0102] Table 1 Results of quality and technical indicators of various embodiments and comparative examples

[0103]

[0104] It can be seen from the data in Table 1 that when the polymer composite auxiliary agent S-530 and fermented cellulose R-88 are added to the suspension system, Examples 1-10 have good stability, high suspension rate, low viscosity, no stratification water after hot storage, and a small increase in particle size. In Comparative Examples 1-2, S-530 is replaced with other emulsifying dispersants, and other auxiliary materials remain unchanged. After hot storage of the suspension, the particle size increase increases, the suspension rate decreases, and even agglomeration and solidification occurs. The above shows that the polymer composite auxiliary agent S-530 has a good effect on inhibiting the particle size growth of pyrethroid suspensions and improving storage stability.

[0105] In Comparative Examples 3-4, the water separation rate of the suspension after hot storage increases as the amount of fermented cellulose decreases. In Comparative Examples 5-6, R-88 is not added to the suspension. As the amount of xanthan gum in the system increases, the viscosity of the system increases, the suspension rate decreases, the water dispersibility becomes worse, and water separation still occurs after hot storage; if the viscosity is too high, the system has a risk of solidification. Example 3 and Comparative Example 5 have the same emulsified dispersion system. The sample of Example 3, in which fermented cellulose R-88 is added to the thickening system, can spontaneously form a cloud when entering water, without visible particles, and the water dispersibility is rated as excellent. Figure 1 As shown; while the comparative example 5 sample without R-88 agglomerates and does not disperse in water, and has poor water dispersibility, such as Figure 2 The above experiments show that fermented cellulose R-88 can provide excellent dispersion and suspension performance for the system.

[0106] Test Example 2 Indoor biological activity determination of the pyrethroid suspension of the present invention

[0107] Test method: Refer to GB / T13917.1-2009 Indoor efficacy test and evaluation of public health insecticides for pesticide registration, spray method.

[0108] Test subjects: Culex pipiens pallens, indoor sensitive strain; Housefly, indoor sensitive strain.

[0109] Experimental treatment: Mosquito and fly test preparation dosage is 15-20mg / m3, diluted 50 times with water, sprayed in cylinder, 30 heads per group, repeated 3 times, the number of knockdowns was counted within 20 minutes, the test insects were restored to standard feeding, and the number of deaths was counted after 24 hours.

[0110] Table 2 Results of indoor efficacy tests on Culex pipiens pallens in the examples and comparative examples

[0111]

[0112]

[0113] Table 3 Results of indoor efficacy test on Culex pipiens pallens in Example 3 after reduction

[0114]

[0115] Table 4 Results of indoor efficacy test on housefly of Examples and Comparative Examples

[0116]

[0117] Table 5 Results of indoor efficacy test on houseflies in Example 3 after reduction

[0118]

[0119] According to the results in Tables 2-5, the knockdown time and mortality rate of Examples 1-8 against mosquitoes and flies are significantly better than those of Comparative Examples 1-2. At the same time, according to the results in Tables 3 and 5, Example 3 can achieve a 30% reduction in dosage compared with Comparative Examples 1 and 2 and achieve the same control effect, which indicates that the introduction of the polymer composite adjuvant S-530 in the suspension system can achieve the dual goals of reducing dosage and increasing efficiency.

[0120] Based on the above analysis, the pyrethroid suspension formulation of the present invention shows better stability, higher suspension rate, lower viscosity and better dispersion performance than the traditional pyrethroid suspension formulation. In addition, the active ingredients and the adjuvants in the suspension of the present invention show good synergistic effects, which can reduce the dosage, save costs, and reduce pollution to the environment, making it safer and more environmentally friendly.

[0121] In addition to the above implementations, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A pyrethroid suspension, characterized in that: The pyrethroid suspension comprises the following raw materials by mass percentage: 0.1-30.0% active ingredient, 1.0-10.0% polymer composite auxiliary agent, 1.0-10.0% wetting agent, 0.5-10.0% dispersant, 0.5-10.0% thickener, 1.0-10.0% antifreeze agent, 0.1-1.0% defoamer, 0.1-1.0% preservative, and water is supplemented to 100%.

2. The pyrethroid suspension according to claim 1, characterized in that: The pyrethroid suspension comprises the following raw materials by mass percentage: 0.1-20.0% active ingredient, 1.0-3.0% polymer composite auxiliary agent, 1.0-3.0% wetting agent, 0.5-3.0% dispersant, 3.0-7.0% thickener, 1.0-5.0% antifreeze agent, 0.1-1.0% defoamer, 0.1-1.0% preservative, and water is supplemented to 100%.

3. The pyrethroid suspension according to claim 1, characterized in that: The active ingredient comprises at least one of cypermethrin, dextro-trans chlorpropamide, chlorfenapyr, ethomethrin, deltamethrin, bifenthrin, high-efficiency cypermethrin, cis-cypermethrin, high-efficiency cyfluthrin or high-efficiency cyhalothrin.

4. The pyrethroid suspension according to claim 1, characterized in that: The active ingredient comprises at least one of cyfluthrin, dextro-trans cypermethrin, deltamethrin, high-efficiency cypermethrin, cis-cypermethrin or high-efficiency cyfluthrin.

5. The pyrethroid suspension according to claim 1, characterized in that: The polymer composite auxiliary agent is a phospholipid-like amphiphilic ternary comb-type copolymer S-530.

6. The pyrethroid suspension according to claim 1, characterized in that: The wetting agent is at least one of polyoxyethylene polyoxypropylene block polyether, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether; the dispersant is at least one of polycarboxylates, phosphate ester salts, lignin sulfonates, and alkyl naphthalene sulfonate formaldehyde condensates; the thickener is at least two of white carbon black, magnesium aluminum silicate, kaolin, attapulgite, xanthan gum, diutan gum, polyvinyl alcohol, and fermented cellulose, one of which is fermented cellulose; the antifreeze agent is at least one of ethylene glycol, propylene glycol, glycerol, and urea.

7. The pyrethroid suspension according to claim 1, characterized in that: The defoaming agent is at least one of organic silicon, polyether modified polysiloxane and polyoxypropylene glycerol ether defoaming agents; the preservative is at least one of potassium sorbate, sodium benzoate, kasone and bronopol.

8. The pyrethroid suspension according to claim 1, characterized in that: The particle size D90 of the suspending agent is ≤5.0 μm.

9. The method for preparing the pyrethroid suspension according to claim 1, characterized in that: The following steps are included: The first step is to mix the pesticide active ingredient, polymer composite adjuvant, wetting agent, dispersant, thickener, antifreeze agent, defoamer, preservative and water according to the proportion and shear them evenly; Step 2: Grind the mixed solution obtained in the above step to a particle size D90≤5.0 μm and filter it out; Step 3: Add fermented cellulose and the remaining amount of water to the filtrate obtained in the second step, and shear evenly to obtain the pyrethroid suspension.

10. The use of the pyrethroid suspension according to claim 1, characterized in that: Used for preventing and controlling sanitary pests, wherein the sanitary pests are mosquitoes and flies.

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