Processing technology of tetraconazole and trifloxystrobin compound suspending agent

Abstract

The invention relates to the field of pesticide preparations, and provides a processing technology of a tetraconazole and trifloxystrobin compound suspending agent, which comprises the following steps: S1, raw material preparation; s2, heating and melting: mixing the two materials in proportion, placing the mixture in heating equipment, heating the mixture to 73-80 DEG C at the heating rate of 5-10 DEG C / min, keeping the temperature interval for 10-20 minutes until the mixture is completely molten, and stirring the mixture at the speed of 20-30 rpm in the heating process; s3, adding the white carbon black: equivalently adding the white carbon black into the solution in three times at the interval of 5 minutes, and stirring for 15 minutes at the speed of 30-50 rpm after adding each time; s4, adding an emulsifier, a dispersing agent and water; s5, temperature control; s6, adding an additive; and S7, preparing a finished product. The process disclosed by the invention has many advantages, the innovative melting method simplifies the preparation process, reduces the consumption of raw materials and energy sources, and reduces the production cost; by scientifically adding white carbon black, the stability of the preparation is improved; the composition reduces the use of organic solvents, reduces environmental pollution, is suitable for disease and pest control of various crops, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide preparations, and in particular to a processing technology for a tetrafluthrin and trifloxystrobin compound suspension. Background Art

[0002] In agricultural production, the quality and performance of pesticide formulations have an important impact on the effect of crop pest control, agricultural product quality and safety, and agricultural ecological environment. As an important pesticide formulation, suspension concentrate has been widely used in the agricultural field because of its good dispersibility, stability and biological activity.

[0003] Tetraconazole and trifloxystrobin are two highly effective fungicides, each with a unique fungicide mechanism and control spectrum. When these two ingredients are compounded into a suspension concentrate, they can theoretically exert a significant synergistic effect and improve the disease prevention and control effect. However, in actual production and application, there are many problems with the compound suspension concentrate of tetraconazole and trifloxystrobin, especially the serious crystallization phenomenon.

[0004] At room temperature, tetrafluconazole is in liquid form (melting point -29.2°C), and trifloxystrobin is in solid powder form (melting point 72.9°C), and tetrafluconazole itself has a certain solubility in trifloxystrobin, and its solubility changes significantly with temperature. According to the conventional suspension preparation process, the product has quality problems such as crystallization, stratification or paste formation when it is stored at hot temperature and converted to room temperature or at low temperature. Therefore, it is of great significance to develop a composite suspension processing technology that can effectively solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a processing technology for a tetrafluthriae and trifloxystrobin composite suspension, overcome the shortcomings of the prior art, improve the stability of the suspension, avoid crystallization, stratification or paste, ensure product quality, and meet the demand for efficient and stable pesticide preparations in agricultural production.

[0006] The technical solution of the present invention is: a processing technology of tetrafluthrin and trifloxystrobin composite suspension, comprising the following steps:

[0007] S1, raw material preparation: accurately select tetrafluthrin and trifloxystrobin with a purity of not less than 95% as active ingredients, and conduct strict quality tests on both before mixing to ensure that they meet the specified purity standards;

[0008] S2, heating and melting: After tetrafluthrin and trifloxystrobin are mixed in a specific ratio, they are placed in a dedicated heating device and heated to 73-80°C at a heating rate of 5-10°C / min, and maintained in this temperature range for 10-20 minutes until the two are completely melted. During the heating process, stirring must be continued at a speed of 20-30rpm to ensure uniform mixing;

[0009] S3, adding white carbon black: adding white carbon black to the solution obtained in S2 in proportion, in three equal additions, with an interval of 5 minutes between each addition. After each addition of white carbon black, stirring at a speed of 30-50 rpm for 15 minutes to ensure uniform adsorption of white carbon black;

[0010] S4, adding emulsifier, dispersant and water: a certain amount of emulsifier and dispersant is added to a certain amount of deionized water and stirred evenly, S3 is added slowly, and a high shear emulsifier is used to perform shear stirring at a speed of 1000-1500 rpm for 30-40 minutes until a uniform suspension is formed;

[0011] S5, temperature control: cool the suspension in S4 to below 30°C through a circulating water cooling device, and control the cooling rate at 3-8°C / min;

[0012] S6, adding additives: when the temperature drops below 30°C, add the defoamer first and stir for 3-5 minutes. Then add the antifreeze, thickener and preservative in sequence. After adding each additive, stir for 10-15 minutes at a stirring speed of 20-30 rpm to finally form a uniform mixture;

[0013] S7, finished product preparation: The mixture in S6 is sheared and stirred at a speed of 1500-2000 rpm using a high-speed disperser for 20-30 minutes to ensure that all ingredients are evenly dispersed to achieve an ideal preparation state.

[0014] Further qualification

[0015] The proportion of active ingredients is measured by mass fraction;

[0016] The addition ratio of tetrafluthrin and trifloxystrobin is 1-35%:35-1%; the preferred ratio is 8-28%:32-3%, and the more preferred ratio is 15%:25%, 20%:20%, and 25%:15%.

[0017] White carbon black addition amount

[0018] The amount of white carbon black added is 1-10%, preferably 2-8%. When the amount of white carbon black added is 2-5%, it can effectively improve the initial suspension rate of the suspension agent; when the amount added is 5-8%, it has a significant effect on the stability of the suspension agent during long-term storage.

[0019] Heating temperature

[0020] Heat to 73-80°C in S2 until tetrafluthrin and trifloxystrobin are completely melted. Within this temperature range, at 73-75°C, the melting process is relatively slow, but it can effectively reduce the thermal decomposition of the active ingredients; at 75-78°C, the melting speed is moderate, and it can ensure that the two active ingredients are fully mixed to form a uniform melting system, which is conducive to the subsequent adsorption and dispersion of white carbon black; at 78-80°C, the melting speed is faster, but the heating time needs to be strictly controlled to prevent excessive decomposition of the active ingredients and energy waste. The preferred heating temperature is 75-78°C.

[0021] Dispersant and emulsifier selection

[0022] Dispersants include one or more of calcium lignin sulfonate (with good dispersibility and stability, suitable for a variety of pesticide formulations, and can effectively reduce the viscosity of the suspension), sodium alkylphenol sulfonate (with strong surface activity, which can improve the dispersibility of active ingredients in water), ethylene oxide propylene oxide polyether (with excellent emulsification and dispersibility, and good compatibility with active ingredients of different polarities), modified polystyrene maleic anhydride resin (which can enhance the stability and anti-sedimentation of the suspension), modified ethylene oxide propylene oxide polyether (with better low-temperature stability and dispersibility) and alkylnaphthalene sulfonic acid sodium salt formaldehyde condensate (with efficient dispersibility and wetting properties); and may also include new dispersant polycarboxylates (with high molecular weight and multi-branched structure, significant dispersibility, and environmentally friendly).

[0023] Emulsifiers include one or more of polyoxyethylene sorbitan monooleate (with good emulsification and stability, and can reduce surface tension), styrylphenol polyoxyethylene ether (strong emulsification ability, and good emulsification effect on both non-ionic and anionic active ingredients), castor oil polyoxyethylene ether (with good wettability and emulsification, and good biodegradability), calcium dodecylbenzene sulfonate (stable emulsification effect, and can improve the dispersibility of suspensions), fatty alcohol polyoxyethylene ether (with excellent emulsification and dispersibility, and applicable to a variety of pesticide active ingredients) and alkylphenol polyoxyethylene ether and polyoxyethylene ether phosphate (with good antistatic and emulsification properties); it can also include a new emulsifier sucrose fatty acid ester (non-toxic, odorless, safe for the human body, with good emulsification and dispersibility, and particularly suitable for food-grade pesticide preparations).

[0024] Other additive options

[0025] Antifreeze agents include one or more of propylene glycol (which has good low-temperature antifreeze performance, can effectively lower the freezing point of the suspension, and has little effect on the stability of the active ingredients), ethylene glycol (which has good antifreeze effect and is relatively low in price, but is highly volatile), glycerol (which has both moisturizing and antifreeze effects and can improve the stability and shelf life of the suspension), and glyceryl ether diglycol (which has good solubility and antifreeze performance and is environmentally friendly).

[0026] Defoaming agents include one or more of organic silicones (rapid defoaming effect and good durability, but relatively high price), organic siloxanes (good defoaming and antifoaming properties, with little effect on the stability of the system), and high-carbon alcohol fatty acid ester complexes (significant defoaming effect and good compatibility with the suspending agent system).

[0027] Preservatives include one or more of paraformaldehyde (which has a broad-spectrum bactericidal effect, has good inhibitory effects on both fungi and bacteria, and has good stability), kasone (strong bactericidal effect, is environmentally friendly, but is more effective under acidic conditions), sodium benzoate (cheap, widely used, but has a relatively narrow antibacterial spectrum), and potassium sorbate (high safety, has no toxic side effects on the human body, and is particularly suitable for food-grade pesticide preparations).

[0028] The thickener includes one or more of organic bentonite (which has good thickening and suspension properties and can improve the stability and anti-sedimentation properties of the suspension), attapulgite (which has a unique fibrous structure, has a significant thickening effect, and can improve the rheological properties of the suspension), magnesium aluminum silicate (which has good thixotropy and stability and can keep the suspension in a uniform state during storage and use) and xanthan gum (which has high viscosity and stability and can enhance the suspension effect and anti-shear properties of the suspension).

[0029] Principle of the invention:

[0030] The physical and chemical properties of tetrafluthriae: colorless viscous liquid, solubility in water is 156.6 mg / L; solubility in organic solvents (mg / L): xylene 300000, acetone 300000, ethyl acetate 300000, n-hexane 15000; melting point: -29.2℃.

[0031] The physical and chemical properties of trifloxystrobin: white odorless solid, melting point 72.9℃, boiling point about 312℃ (begins to decompose at 328℃). Vapor pressure 3.4×10 -6 Pa (25℃), solubility in water 610μg / L (25℃). Stable in pH=5 aqueous solution. Product content ≥95%, up to 98% or more.

[0032] Tetrafluthrin itself has a certain solubility in trifloxystrobin, and the solubility changes with temperature: the solubility increases with increasing temperature and decreases with decreasing temperature. Products made according to conventional suspension preparation processes will have quality problems such as hot storage to room temperature, low-temperature crystallization, stratification or paste, making it difficult to produce qualified products.

[0033] White carbon black is a porous material with ultra-high specific surface area and extremely high adsorption capacity. It is easy to suspend and has good affinity and chemical stability. After melting tetrafluconazole and trifloxystrobin, a certain amount of white carbon black is used for adsorption, which can avoid the effect of tetrafluconazole on the dissolution of trifloxystrobin, thereby preparing a qualified suspension product.

[0034] The present invention has the following beneficial effects:

[0035] 1. Compared with the traditional process, the melting method adopted in the present invention is more efficient and has a better mixing effect, and can make the active ingredients more evenly dispersed in the preparation.

[0036] 2. Accurate application of white carbon black: By precisely controlling the amount of white carbon black added, the stability and dispersibility of the suspension concentrate are optimized, the effect of tetrafluthriae on the dissolution of trifloxystrobin is reduced, and the quality of the preparation is improved.

[0037] 3. Optimization of temperature control: Strict temperature control measures ensure the stability of the preparation during production and storage, and extend the shelf life of the preparation.

[0038] The process of the invention is simple: an innovative melting method is adopted to greatly simplify the traditional complicated multi-step preparation process; the consumption of raw materials and energy is significantly reduced, and the production cost is effectively reduced; the stability of the preparation is greatly improved by scientifically adding white carbon black and strict temperature control; it is suitable for the prevention and control of pests and diseases of various crops and has broad application prospects; the use of organic solvents is reduced, and the pollution to the environment is reduced.

[0039] The detailed structure of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 - is a process flow chart of the present invention. DETAILED DESCRIPTION

[0041] Embodiment 1

[0042] As attached Figure 1 As shown: A processing technology of tetrafluthrin and trifloxystrobin composite suspension, comprising the following steps:

[0043] S1, raw material preparation: accurately select tetrafluconazole and trifloxystrobin with a purity of 95% as active ingredients, and conduct strict quality inspection on the two before mixing to ensure that they meet the specified purity standards; preferably, convert according to the content of the active ingredient in the original drug, and accurately weigh 5% of tetrafluconazole and 30% of trifloxystrobin for use, the total weight of the preparation can be selected as needed, and in this embodiment, the total weight of the preparation is 500g.

[0044] S2, heating and melting: After tetrafluthrin and trifloxystrobin are mixed in a specific ratio, they are placed in a dedicated heating device and heated to 75°C at a heating rate of 8°C / min, and maintained in this temperature range for 15 minutes until the two are completely melted. During the heating process, stirring must be continued at a speed of 25 rpm to ensure uniform mixing;

[0045] S3, adding white carbon black: adding white carbon black to the solution obtained in S2 in proportion, by adding equal amounts three times, with an interval of 5 minutes between each addition; after each addition of white carbon black, stirring at a speed of 30 rpm for 15 minutes to ensure uniform adsorption of white carbon black;

[0046] S4, adding emulsifier, dispersant and water: a certain amount of emulsifier and dispersant is added to a certain amount of deionized water and stirred evenly, S3 is added slowly, and shear stirring is performed at a speed of 1100 rpm using a high shear emulsifier for 35 minutes until a uniform suspension is formed;

[0047] Preferably, the dispersant is 3% of calcium lignin sulfonate and the emulsifier is 2% of styrylphenol polyoxyethylene ether, and the balance of deionized water is gradually added in proportion.

[0048] S5, temperature control: cool the suspension in S4 to below 30°C through a circulating water cooling device, and control the cooling rate at 5°C / min;

[0049] S6, adding additives: when the temperature drops below 30°C, add the defoamer first and stir for 5 minutes. Then add the antifreeze, thickener and preservative in sequence, stir for 12 minutes after each additive is added, and the stirring speed is 25 rpm to finally form a uniform mixture; preferably, add 0.2% of the defoamer: organosiloxane; 3% of the antifreeze: ethylene glycol; 1.2% of the thickener: 1% magnesium aluminum silicate + 0.2% xanthan gum; 0.2% of the preservative: kason.

[0050] S7, finished product preparation: The mixture in S6 is sheared and stirred at a speed of 1500 rpm using a high-speed disperser for 30 minutes to ensure that all ingredients are evenly dispersed to achieve an ideal preparation state.

[0051] Embodiment 2

[0052] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 10%, and the addition amount of trifloxystrobin is 25%.

[0053] Embodiment 3

[0054] The difference between this embodiment and the first embodiment is that the addition amount of tetraconazole is 15%, and the addition amount of trifloxystrobin is 20%.

[0055] Embodiment 4

[0056] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 20%, and the addition amount of trifloxystrobin is 15%.

[0057] Embodiment 5

[0058] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 25%, and the addition amount of trifloxystrobin is 10%.

[0059] Embodiment 6

[0060] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 30%, and the addition amount of trifloxystrobin is 5%.

[0061] Embodiment 7

[0062] The difference between this embodiment and the first embodiment is that the amount of white carbon black is 1%.

[0063] Embodiment 8

[0064] The difference between this embodiment and the first embodiment is that the amount of white carbon black is 5%.

[0065] Embodiment 9

[0066] The difference between this embodiment and the first embodiment is that the amount of white carbon black is 8%.

[0067] Embodiment 10

[0068] The difference between this embodiment and the first embodiment is that the amount of white carbon black is 10%.

[0069] Embodiment 11

[0070] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 10%, the addition amount of trifloxystrobin is 15%, white carbon black is 2%, dispersant: 4% modified polystyrene maleic anhydride resin, emulsifier: 2.5% fatty alcohol polyoxyethylene ether, antifreeze agent: 3% propylene glycol, thickener: 1% magnesium aluminum silicate + 0.15% xanthan gum, defoamer: 0.2% organosiloxane, preservative: 0.15% kason, and the balance is deionized water: supplemented to 100%.

[0071] Embodiment 12

[0072] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 12%, the addition amount of trifloxystrobin is 20%, white carbon black is 3%, dispersant: 5% ethylene oxide propylene oxide polyether, emulsifier: 1% polyoxyethylene sorbitan monooleate, antifreeze agent: 2% propylene glycol, thickener: 0.1% xanthan gum, defoamer: 0.3% organic silicone, preservative: 0.1% sodium benzoate, and the balance is deionized water: supplemented to 100%.

[0073] Embodiment 13

[0074] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 16%, the addition amount of trifloxystrobin is 20%, white carbon black is 5%, dispersant: 6% sodium alkylphenol sulfonate, emulsifier: 1.5% styrylphenol polyoxyethylene ether, antifreeze agent: 3% glycerol ether diethylene glycol, thickener: 0.2% organic bentonite + 0.1% xanthan gum, defoamer: 0.2% organic siloxane, preservative: 0.1% sodium benzoate, and the balance is deionized water: supplemented to 100%.

[0075] Embodiment 14

[0076] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 20%, the addition amount of trifloxystrobin is 15%, white carbon black is 5%, dispersant: 8% modified ethylene oxide propylene oxide polyether, emulsifier: 1% castor oil polyoxyethylene ether + 1% styrylphenol polyoxyethylene ether, antifreeze: 3% propylene glycol, thickener: 0.2% attapulgite + 0.1% xanthan gum, defoamer: 0.3% organic silicone, preservative: 0.1% potassium sorbate, and the balance is deionized water: make up to 100%.

[0077] Embodiment 15

[0078] The difference between this embodiment and the first embodiment is that the addition amount of tetrafluthrin is 20%, the addition amount of trifloxystrobin is 20%, white carbon black is 6%, dispersant: 9% alkyl naphthalene sulfonate sodium salt formaldehyde condensate, emulsifier: 0.5% alkylphenol polyoxyethylene ether, antifreeze agent: 3% propylene glycol, thickener: 0.08% xanthan gum, defoamer: 0.2% organosiloxane, preservative: 0.08% polyformaldehyde, and the balance is deionized water: supplemented to 100%.

[0079] Embodiment 16

[0080] The difference between this embodiment and the first embodiment is that: the addition amount of tetrafluthrin is 25%, the addition amount of trifloxystrobin is 25%, white carbon black is 8%, dispersant: 2% modified ethylene oxide propylene oxide polyether + 5%% alkyl naphthalene sulfonate sodium salt formaldehyde condensate, emulsifier: 1% castor oil polyoxyethylene ether + 0.5% alkylphenol polyoxyethylene ether, antifreeze: 3% propylene glycol, thickener: 0.05% xanthan gum, defoamer: 0.3% organic silicone, preservative: 0.05% polyformaldehyde, and the balance is deionized water: supplemented to 100%.

[0081] Embodiment 17

[0082] The difference between this embodiment and the first embodiment is that: the addition amount of tetrafluthrin is 30%, the addition amount of trifloxystrobin is 10%, the white carbon black is 6%, the dispersant is 1% modified polystyrene maleic anhydride resin + 5% sodium alkylphenol sulfonate, the emulsifier is 0.5% fatty alcohol polyoxyethylene ether + 0.5% alkylphenol polyoxyethylene ether, the antifreeze agent is 3% propylene glycol, the thickener is 0.5% magnesium aluminum silicate + 0.1% xanthan gum, the defoamer is 0.2% high carbon alcohol fatty acid ester complex, the preservative is 0.1% potassium sorbate, and the balance is deionized water: supplemented to 100%.

[0083] Comparative Example 1

[0084] The difference between this embodiment and the first embodiment is that: in the conventional suspension process, the original drug is directly added without heating and melting; the addition amount of tetrafluthrin is 10%, the addition amount of trifloxystrobin is 15%, the white carbon black is 2%, the dispersant is 4% modified polystyrene maleic anhydride resin, the emulsifier is 2.5% fatty alcohol polyoxyethylene ether, the antifreeze agent is 3% propylene glycol, the thickener is 1% magnesium aluminum silicate + 0.15% xanthan gum, the defoamer is 0.2% organosiloxane, the preservative is 0.15% kason, and the balance is deionized water: supplemented to 100%.

[0085] Comparative Example 2

[0086] The difference between this embodiment and the first embodiment is that: in the conventional suspension process, the original drug is directly added without heating and melting; the addition amount of tetrafluthrin is 10%, the addition amount of trifloxystrobin is 15%, the dispersant is 4% modified polystyrene maleic anhydride resin, the emulsifier is 2.5% fatty alcohol polyoxyethylene ether, the antifreeze agent is 3% propylene glycol, the thickener is 1% magnesium aluminum silicate + 0.15% xanthan gum, the defoamer is 0.2% organosiloxane, the preservative is 0.15% kason, and the balance is deionized water: supplemented to 100%.

[0087]

[0088]

[0089]

[0090]

[0091] The performance of the suspension concentrates prepared in the above examples and comparative examples was tested, wherein the suspension rate was tested according to GB / T14825-2006, the low temperature stability was tested according to GB / T19137-2003, and the hot storage stability was tested according to GB / T19136-2003; during the testing process, the temperature during refrigeration was 0°C, and the temperature during hot storage was 54°C, ±2°C; data were collected after 14 days of refrigeration and hot storage, and the samples were placed at room temperature before collection, and the samples were measured after returning to room temperature; the test results are shown in the following table:

[0092]

[0093]

[0094]

[0095] From the above test results, it can be seen that from the comparison between Examples 1-17 and Comparative Examples 1 and 2, it can be seen that the suspension prepared by the processing technology of the present invention has outstanding stability, and the suspension rate detected after refrigerated hot storage for 14 days is above 95%, while Comparative Examples 1 and 2 both have abnormalities such as water precipitation, crystallization, and creaming, indicating that the suspension product prepared by the processing technology of the present invention has outstanding stability and stable product quality; in addition, it can be seen from Examples 1-6 that the suspension prepared by the method of the present invention has no obvious effect on the cold storage and hot storage of the suspension when the amount of the effective ingredient added is within a reasonable range, and the suspension rate after cold storage and hot storage is excellent. During the entire test process, the suspension in Examples 1-6 has no abnormalities such as water precipitation, stratification, and crystallization, and the product is stable and reliable, which is significantly better than the suspension prepared by conventional processes in Comparative Examples 1 and 2; in addition, from Examples 1 and 7- 10 shows that, when the suspension agent is prepared by the process of the present invention, the addition of white carbon black within the specified range has no significant effect on the stability of the suspension agent product, and no abnormal conditions such as water precipitation, stratification, and crystallization occur. The suspension rate is above 95%, which is significantly better than that of Comparative Examples 1 and 2. Furthermore, from Examples 1 and 11-17, it can be seen that the use of different additives has no significant effect on the product stability of the suspension agent. After 14 days of testing, the stability of the suspension agent product prepared by the processing technology of the present invention is significantly better than that of Comparative Examples 1 and 2. The innovative melting method greatly simplifies the traditional cumbersome multi-step preparation process; significantly reduces the consumption of raw materials and energy, and effectively reduces the production cost; by scientifically adding white carbon black and strictly controlling the temperature, the stability of the preparation is greatly improved; it is suitable for the prevention and control of pests and diseases of various crops, and has a wide range of application prospects; reduces the use of organic solvents, and reduces the pollution to the environment.

[0096] The above are preferred embodiments of the present invention and the technical principles used therein. For those skilled in the art, any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, are within the scope of protection of the present invention.

Claims

1. A processing technology for a tetrafluanidazole and trifloxystrobin composite suspension concentrate, characterized in that: The following steps are involved: S1, raw material preparation: accurately select tetrafluthrin and trifloxystrobin with a purity of not less than 95% as active ingredients, and conduct strict quality tests on both before mixing to ensure that they meet the specified purity standards; S2, heating and melting: After tetrafluthrin and trifloxystrobin are mixed in a specific ratio, they are placed in a dedicated heating device and heated to 73-80°C at a heating rate of 5-10°C / min, and maintained in this temperature range for 10-20 minutes until the two are completely melted; during the heating process, stirring is required to be continued at a speed of 20-30rpm to ensure uniform mixing; S3, adding white carbon black: adding white carbon black to the solution obtained in S2 in proportion, by adding equal amounts three times, with an interval of 5 minutes between each addition; after each addition of white carbon black, stirring at a speed of 30-50 rpm for 15 minutes to ensure uniform adsorption of white carbon black; S4, adding emulsifier, dispersant and water: a certain amount of emulsifier and dispersant is added to a certain amount of deionized water and stirred evenly, the melt in S3 is slowly added, and a high shear emulsifier is used to perform shear stirring at a speed of 1000-1500 rpm for 30-40 minutes until a uniform suspension is formed; S5, temperature control: cool the suspension in S4 to below 30°C through a circulating water cooling device, and control the cooling rate at 3-8°C / min; S6, adding additives: when the temperature drops below 30°C, add the defoamer first and stir for 3-5 minutes; then add the antifreeze agent, thickener and preservative in sequence, stir for 10-15 minutes after adding each additive, and stir at a speed of 20-30 rpm to finally form a uniform mixture; S7, finished product preparation: The mixture in S6 is sheared and stirred at a speed of 1500-2000 rpm using a high-speed disperser for 20-30 minutes to ensure that all ingredients are evenly dispersed to form a suspension.

2. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The addition ratio of tetrafluthrin and trifloxystrobin is 1-35%:35-1%.

3. The processing technology of the tetrafluthrin and trifloxystrobin composite suspension according to claim 1, characterized in that: The added amount of the white carbon black is 1-10%.

4. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The heating temperature in S2 is 75-78°C.

5. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The dispersant includes one or more of calcium lignin sulfonate, sodium alkylphenol sulfonate, ethylene oxide propylene oxide polyether, modified polystyrene maleic anhydride resin, modified ethylene oxide propylene oxide polyether and alkylnaphthalene sulfonic acid sodium salt formaldehyde condensate; and may also include new dispersant polycarboxylates.

6. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The emulsifier includes one or more of polyoxyethylene sorbitan monooleate, polyoxyethylene styrylphenol ether, polyoxyethylene castor oil ether, calcium dodecylbenzene sulfonate, polyoxyethylene fatty alcohol ether, polyoxyethylene alkylphenol ether and polyoxyethylene ether phosphate; and may also include a new emulsifier, sucrose fatty acid ester.

7. The processing technology of the tetrafluthrin and trifloxystrobin composite suspension according to claim 1, characterized in that: The antifreeze agent includes one or more of propylene glycol, ethylene glycol, glycerol and glyceryl ether diglycol.

8. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The defoaming agent includes one or more of organic silicone, organic siloxane, and high carbon alcohol fatty acid ester complex.

9. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The preservatives include one or more of paraformaldehyde, kasone, sodium benzoate and potassium sorbate.

10. The processing technology of the tetrafluconazole and trifloxystrobin composite suspension according to claim 1, characterized in that: The thickener includes one or more of organic bentonite, attapulgite, magnesium aluminum silicate and xanthan gum.

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