Preparation method of polycarboxylate dispersing agent and application of polycarboxylate dispersing agent in pesticide

Abstract

The invention relates to the technical field of dispersing agents, and discloses a preparation method of a polycarboxylate dispersing agent and application of the polycarboxylate dispersing agent in pesticides, 2-allylpentyl-4-alkenyl amine and 4-bromo-1-butanol are subjected to a substitution reaction to obtain an intermediate 1, then the intermediate 1 and 1, 3-propane sultone are subjected to a ring-opening reaction to obtain an intermediate product 2, and the intermediate product 2, 3-propane sultone is subjected to a ring-opening reaction to obtain the polycarboxylate dispersing agent. The intermediate product 2, perfluorooctanoyl chloride and phosphorus pentoxide are sequentially used for reaction to obtain fluorine-containing diene and diene phosphate, and finally acrylic acid, allyl polyethylene glycol, the diene phosphate, the fluorine-containing diene and the like are used as raw materials for reaction to obtain the polycarboxylate dispersing agent. The polycarboxylate dispersing agent prepared by the invention has a relatively good dispersing effect and has a wide application prospect in the field of pesticides.

Description

Technical Field

[0001] The invention relates to the technical field of dispersants, in particular to a preparation method of a polycarboxylate dispersant and application of the polycarboxylate dispersant in pesticides. Background Art

[0002] Traditional pesticide emulsions require a large amount of organic solvents such as toluene, which not only causes serious environmental pollution, but also wastes petrochemical resources. With the increasing depletion of petroleum resources, the price of organic solvent products has increased year by year. At the same time, due to the continuous enhancement of people's environmental awareness, the use of water instead of organic solvents to prepare water-based preparations such as water suspensions and water dispersants has become the focus of attention of the domestic and foreign pesticide industry. As an important component of water-based pesticide preparations, the quality and performance of dispersants directly determine the dispersion stability of pesticide particles in the suspension system, which is of great significance to the development of pesticides.

[0003] Dispersants are substances that can reduce the agglomeration of solid or liquid particles in a dispersed system. They are widely used in the fields of pesticides, coatings, building materials, etc. Polycarboxylate dispersants are the most widely used due to their excellent dispersing effect. For example, the patent with the authorization announcement number CN 103910832 B discloses a polycarboxylate pesticide dispersant and a preparation method thereof. The invention uses monomer A, monomer B, monomer C, etc. as raw materials, and the prepared dispersant can make the pesticide particles disperse stably. Summary of the invention

[0004] The purpose of the present invention is to overcome one or more deficiencies in the prior art and to provide a polycarboxylate dispersant. The polycarboxylate dispersant prepared by the method has excellent dispersibility and can be applied to pesticides to improve the suspension rate of the pesticides.

[0005] In order to achieve the above object, a technical solution adopted by the present invention is:

[0006] A preparation method of a polycarboxylate dispersant, the preparation method is as follows:

[0007] (1) 2-allylpent-4-enylamine is added to an ethanol solvent, stirred and mixed evenly, and then 4-bromo-1-butanol is added thereto, and the reaction is carried out at 70-80° C. for 24-36 hours. After the reaction is completed, the solvent is removed, and the mixture is washed with ether and dried to obtain an intermediate product 1. 2-allylpent-4-enylamine and 4-bromo-1-butanol are subjected to a substitution reaction to obtain an intermediate 1. The reaction route is:

[0008]

[0009] (2) The intermediate product 1 and 1,3-propane sultone are added to a methanol solvent, and the reaction is carried out at 60-65° C. for 24-30 hours. After the reaction is completed, the intermediate product 2 is obtained by vacuum filtration, washing with ether, and drying. The intermediate product 2 is obtained by ring-opening reaction of the intermediate product 1 and 1,3-propane sultone. The reaction route is:

[0010]

[0011] (3) The intermediate product 2 and triethylamine are added to a dichloromethane solvent, stirred and mixed evenly, and then perfluorooctanoyl chloride is added thereto, the temperature is controlled at 0-10° C., and the reaction is carried out for 20-30 hours. After the reaction is completed, the reaction is filtered and dried to obtain a fluorinated diene. Under the catalysis of triethylamine, the intermediate product 2 and perfluorooctanoyl chloride are subjected to an esterification reaction to obtain a fluorinated diene. The reaction route is:

[0012]

[0013] (4) Add acrylic acid, methyl methacrylate, and allyl polyethylene glycol to a flask, stir and disperse, then add diene phosphate, fluorinated diene, inhibitor, and initiator, stir and mix evenly, heat to 70-85° C., react for 6-10 hours, and after the reaction is completed, cool to room temperature, and use 30% by mass sodium hydroxide aqueous solution to adjust the pH to 7-9 to obtain a polycarboxylate dispersant.

[0014] Preferably, in (1), the molar ratio of 2-allylpent-4-enylamine to 4-bromo-1-butanol is 1:1-1.2.

[0015] Preferably, in (2), the molar ratio of the intermediate product 1 to 1,3-propanesultone is 1:1-1.5.

[0016] Preferably, in (3), the molar ratio of the intermediate product 2, triethylamine and perfluorooctanoyl chloride is 1:1-1.4:1-1.2.

[0017] Preferably, in (4), the molar ratio of acrylic acid, methyl methacrylate, allyl polyethylene glycol, diene phosphate, and fluorinated diene is 0.5-1.2:0.1-0.4:1:0.1-0.5:0.1-0.5.

[0018] Preferably, in (4), the polymerization inhibitor is hydroquinone, and its usage is 0.3-0.7% of the mass of allyl polyethylene glycol; the initiator is potassium persulfate, and its usage is 0.3-0.6% of the mass of the total monomers.

[0019] Preferably, in (4), the preparation method of diene phosphate is:

[0020] The intermediate product 2 is added to carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution of phosphorus pentoxide is added thereto at 40-45°C, and the temperature is raised to 60-70°C for reaction for 3-6h. After the reaction is completed, deionized water is added thereto, and the hydrolysis reaction is performed for 1-2h, and the solvent is removed. Finally, deionized water and ether are added thereto for extraction and distillation to obtain diene phosphate. The hydroxyl group in the intermediate product 2 is subjected to a phosphate esterification reaction with phosphorus pentoxide to obtain diene phosphate. The reaction route is:

[0021]

[0022] Preferably, the molar ratio of the intermediate product 2 to phosphorus pentoxide is 1:1-1.5.

[0023] Preferably, the polycarboxylate dispersant is used in pesticides.

[0024] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0025] (1) The diene phosphate and fluorinated diene prepared by the present invention have a simple preparation method and a novel structure. They are polymerized with acrylic acid or the like to obtain a polycarboxylate dispersant, which contains not only a hydrophobic hydrocarbon long chain but also a hydrophobic perfluorinated long chain. Compared with the hydrocarbon chain, the hydrophobic perfluorinated long chain has a larger molecular volume and is easier to form a bilayer. The synergistic spatial repulsion effect is greater than that of a single structure, the electrostatic repulsion force is stronger, and the dispersion effect is better.

[0026] (2) The polycarboxylate dispersant prepared by the present invention contains a large number of hydrophilic structures such as sulfonic acid groups, phosphate groups and carboxyl groups, which can be firmly adsorbed on the surface of pesticide solid particles. Different hydrophilic structures can interact with each other to increase the anchoring effect on the original drug, have a strong synergistic effect, and can prevent the particle size from growing and the bottoming out during hot storage. In addition, since the particles have the same charge and are difficult to approach, the suspension agent obtains better dispersion stability. The outward hydrophobic carbon fluorine chains and hydrocarbon chains of the dispersant molecules aggregate with other hydrophobic chains to continue to adsorb the particles, forming double adsorption, further enhancing the dispersing effect of the dispersant on the particles, and forming a strengthened wetting dispersion system. In addition, under high temperature of hot storage, due to the relatively tight double-layer shielding layer formed around the original drug particles, the original drug particles are blocked from water, effectively inhibiting crystallization and improving the suspension effect. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are 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.

[0028] Preparation method of perfluorooctanoyl chloride: Add 1.7 g of thionyl chloride to 10 g of perfluorooctanoic acid, stir and disperse, then add 0.5 mL of N,N-dimethylformamide, heat to 75°C, react for 3 hours, let stand, take the lower organic phase, and rotary evaporate to obtain perfluorooctanoyl chloride.

[0029] Example 1

[0030] (1) 0.5 mol of 2-allylpent-4-enylamine was added to an ethanol solvent and stirred to mix well. Then, 0.5 mol of 4-bromo-1-butanol was added thereto and reacted at 75° C. for 36 h. After the reaction was completed, the solvent was removed, the product was washed with ether, and dried to obtain an intermediate 1.

[0031] (2) 0.2 mol of the intermediate product 1 and 0.25 mol of 1,3-propane sultone were added to a methanol solvent and reacted at 60° C. for 26 h. After the reaction was completed, the mixture was filtered under reduced pressure, washed with ether, and dried to obtain the intermediate product 2.

[0032] (3) 0.08 mol of the intermediate product 2 was added to a carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution containing 0.1 mol of phosphorus pentoxide was added thereto at 45° C. The temperature was raised to 70° C. and reacted for 3 h. After the reaction was completed, deionized water was added thereto and the hydrolysis reaction was carried out for 2 h. The solvent was removed, and finally deionized water and ether were added thereto for extraction and distillation to obtain diene phosphate.

[0033] (4) 0.1 mol of the intermediate product 2 and 0.1 mol of triethylamine were added to a dichloromethane solvent, stirred and mixed evenly, and then 0.12 mol of perfluorooctanoyl chloride was added thereto. The temperature was controlled at 0° C. and the reaction was carried out for 30 hours. After the reaction was completed, the mixture was filtered and dried to obtain a fluorinated diene.

[0034] (5) 0.05 mol of acrylic acid, 0.02 mol of methyl methacrylate, and 0.1 mol of allyl polyethylene glycol (relative molecular weight of 1000) were added to a flask and stirred to disperse. Then, 0.01 mol of diene phosphate, 0.01 mol of fluorinated diene, 0.5 g of hydroquinone inhibitor, and 0.36 g of potassium persulfate initiator were added and stirred to mix evenly. The mixture was heated to 85° C. and reacted for 6 h. After the reaction was completed, the mixture was cooled to room temperature and a 30% by mass sodium hydroxide aqueous solution was used to adjust the pH to 8 to obtain a polycarboxylate dispersant.

[0035] Example 2

[0036] (1) 0.5 mol of 2-allylpent-4-enylamine was added to an ethanol solvent and stirred to mix evenly. Then, 0.6 mol of 4-bromo-1-butanol was added thereto and reacted at 70° C. for 36 h. After the reaction was completed, the solvent was removed, the product was washed with ether, and dried to obtain an intermediate 1.

[0037] (2) 0.2 mol of the intermediate product 1 and 0.3 mol of 1,3-propane sultone were added to a methanol solvent and reacted at 65° C. for 24 h. After the reaction was completed, the mixture was filtered under reduced pressure, washed with ether, and dried to obtain an intermediate product 2.

[0038] (3) 0.08 mol of the intermediate product 2 was added to a carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution containing 0.12 mol of phosphorus pentoxide was added thereto at 45° C. The temperature was raised to 60° C. and reacted for 6 h. After the reaction was completed, deionized water was added thereto and the hydrolysis reaction was carried out for 2 h. The solvent was removed, and finally deionized water and ether were added thereto for extraction and distillation to obtain diene phosphate.

[0039] (4) 0.1 mol of the intermediate product 2 and 0.12 mol of triethylamine were added to a dichloromethane solvent, stirred and mixed evenly, and then 0.1 mol of perfluorooctanoyl chloride was added thereto. The temperature was controlled at 10° C. and the reaction was carried out for 24 hours. After the reaction was completed, the mixture was filtered and dried to obtain a fluorinated diene.

[0040] (5) 0.1 mol of acrylic acid, 0.04 mol of methyl methacrylate, and 0.1 mol of allyl polyethylene glycol (relative molecular weight of 1200) were added to a flask and stirred to disperse. Then, 0.02 mol of diene phosphate, 0.02 mol of fluorinated diene, 0.7 g of hydroquinone inhibitor, and 0.8 g of potassium persulfate initiator were added and stirred to mix evenly. The mixture was heated to 70° C. and reacted for 10 h. After the reaction was completed, the mixture was cooled to room temperature and a 30% by mass sodium hydroxide aqueous solution was used to adjust the pH to 7 to obtain a polycarboxylate dispersant.

[0041] Example 3

[0042] (1) 0.5 mol of 2-allylpent-4-enylamine was added to an ethanol solvent and stirred to mix well. Then, 0.55 mol of 4-bromo-1-butanol was added thereto and reacted at 80° C. for 24 h. After the reaction was completed, the solvent was removed, the product was washed with ether, and dried to obtain an intermediate 1.

[0043] (2) 0.2 mol of the intermediate product 1 and 0.3 mol of 1,3-propane sultone were added to a methanol solvent and reacted at 60° C. for 24 h. After the reaction was completed, the mixture was filtered under reduced pressure, washed with ether, and dried to obtain an intermediate product 2.

[0044] (3) 0.08 mol of the intermediate product 2 is added to a carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution containing 0.08 mol of phosphorus pentoxide is added thereto at 40° C. The temperature is raised to 65° C. and reacted for 5 h. After the reaction is completed, deionized water is added thereto and the hydrolysis reaction is carried out for 1 h. The solvent is removed, and finally deionized water and ether are added thereto for extraction and distillation to obtain diene phosphate.

[0045] (4) 0.1 mol of the intermediate product 2 and 0.14 mol of triethylamine were added to a dichloromethane solvent, stirred and mixed evenly, and then 0.11 mol of perfluorooctanoyl chloride was added thereto. The temperature was controlled at 5° C. and the reaction was carried out for 20 hours. After the reaction was completed, the mixture was filtered and dried to obtain a fluorinated diene.

[0046] (5) 0.12 mol of acrylic acid, 0.01 mol of methyl methacrylate, and 0.1 mol of allyl polyethylene glycol (relative molecular weight of 1200) were added to a flask and stirred to disperse. Then, 0.03 mol of diene phosphate, 0.03 mol of fluorinated diene, 0.3 g of hydroquinone polymerization inhibitor, and 0.6 g of potassium persulfate initiator were added and stirred to mix evenly. The temperature was raised to 75° C. and the reaction was carried out for 8 hours. After the reaction was completed, the mixture was cooled to room temperature and a 30% by mass sodium hydroxide aqueous solution was used to adjust the pH to 9 to obtain a polycarboxylate dispersant.

[0047] Example 4

[0048] (1) 0.5 mol of 2-allylpent-4-enylamine was added to an ethanol solvent and stirred to mix well. Then, 0.55 mol of 4-bromo-1-butanol was added thereto and reacted at 75° C. for 28 h. After the reaction was completed, the solvent was removed, the product was washed with ether, and dried to obtain an intermediate 1.

[0049] (2) 0.2 mol of the intermediate product 1 and 0.25 mol of 1,3-propane sultone were added to a methanol solvent and reacted at 65° C. for 25 h. After the reaction was completed, the mixture was filtered under reduced pressure, washed with ether, and dried to obtain an intermediate product 2.

[0050] (3) 0.08 mol of the intermediate product 2 was added to carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution containing 0.12 mol of phosphorus pentoxide was added thereto at 45° C. The temperature was raised to 65° C. and reacted for 5 h. After the reaction was completed, deionized water was added thereto and the hydrolysis reaction was carried out for 2 h. The solvent was removed, and finally deionized water and ether were added thereto for extraction and distillation to obtain diene phosphate.

[0051] (4) 0.1 mol of the intermediate product 2 and 0.12 mol of triethylamine were added to a dichloromethane solvent, stirred and mixed evenly, and then 0.12 mol of perfluorooctanoyl chloride was added thereto. The temperature was controlled at 5° C. and the reaction was carried out for 24 hours. After the reaction was completed, the mixture was filtered and dried to obtain a fluorinated diene.

[0052] (5) 0.08 mol of acrylic acid, 0.02 mol of methyl methacrylate, and 0.1 mol of allyl polyethylene glycol (relative molecular weight of 2400) were added to a flask and stirred to disperse. Then, 0.04 mol of diene phosphate, 0.04 mol of fluorinated diene, 0.5 g of hydroquinone inhibitor, and 0.8 g of potassium persulfate initiator were added and stirred to mix evenly. The mixture was heated to 85° C. and reacted for 7 h. After the reaction was completed, the mixture was cooled to room temperature and a 30% by mass sodium hydroxide aqueous solution was used to adjust the pH to 7 to obtain a polycarboxylate dispersant.

[0053] Example 5

[0054] (1) 0.5 mol of 2-allylpent-4-enylamine was added to an ethanol solvent and stirred to mix well. Then, 0.55 mol of 4-bromo-1-butanol was added thereto and reacted at 80° C. for 30 h. After the reaction was completed, the solvent was removed, the product was washed with ether, and dried to obtain an intermediate 1.

[0055] (2) 0.2 mol of intermediate product 1 and 0.2 mol of 1,3-propane sultone were added to a methanol solvent and reacted at 60° C. for 30 h. After the reaction was completed, the mixture was filtered under reduced pressure, washed with ether, and dried to obtain intermediate product 2.

[0056] (3) 0.08 mol of the intermediate product 2 was added to a carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution containing 0.1 mol of phosphorus pentoxide was added thereto at 45° C. The temperature was raised to 65° C. and reacted for 5 h. After the reaction was completed, deionized water was added thereto and the hydrolysis reaction was carried out for 2 h. The solvent was removed, and finally deionized water and ether were added thereto for extraction and distillation to obtain diene phosphate.

[0057] (4) 0.1 mol of the intermediate product 2 and 0.12 mol of triethylamine were added to a dichloromethane solvent, stirred and mixed evenly, and then 0.12 mol of perfluorooctanoyl chloride was added thereto. The temperature was controlled at 10° C. and the reaction was carried out for 20 h. After the reaction was completed, the mixture was filtered and dried to obtain a fluorinated diene.

[0058] (5) 0.1 mol of acrylic acid, 0.04 mol of methyl methacrylate, and 0.1 mol of allyl polyethylene glycol (relative molecular weight of 2400) were added to a flask and stirred to disperse. Then, 0.05 mol of diene phosphate, 0.05 mol of fluorinated diene, 0.6 g of hydroquinone inhibitor, and 1 g of potassium persulfate initiator were added and stirred to mix evenly. The temperature was raised to 75° C. and the reaction was carried out for 10 hours. After the reaction was completed, the mixture was cooled to room temperature and a 30% by mass sodium hydroxide aqueous solution was used to adjust the pH to 7 to obtain a polycarboxylate dispersant.

[0059] Comparative Example 1

[0060] The difference between this comparative example and Example 1 is that in step (5), no diene phosphate is contained.

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 1 is that in step (5), no fluorine-containing diene is contained.

[0063] Weigh 2 g of wetting agent SR-02, 5 g of polycarboxylate dispersant, 5 g of ethylene glycol, 0.5 g of guar gum and 87.5 g of deionized water into a round-bottom glass bottle, stir to dissolve, add 50 g of imidacloprid technical, wet grind for 3 h, filter the material to obtain an imidacloprid aqueous suspension.

[0064] Zeta potential test: add 10 g of deionized water to 0.1 g of imidacloprid aqueous suspension, stir and mix evenly, then add phosphate buffer to adjust the pH value to 7.0, centrifuge, take the supernatant, and test the Zeta potential using a potentiometer.

[0065] Table 1:

[0066] Zeta potential (mV) Example 1 -32 Example 2 -38 Example 3 -46 Example 4 -55 Example 5 -60 Comparative Example 1 -25 Comparative Example 2 -22

[0067] When the Zeta potential of the particles is equal to zero (i.e., the isoelectric point), the attraction between the particles is greater than the repulsion between the double electric layers, and the particles agglomerate and settle. Therefore, it can be seen from the table that the imidacloprid aqueous suspension prepared by the present invention has a good dispersion effect and is not easy to settle. Moreover, it can be seen from Comparative Examples 1-2 and Examples 1-5 that the effect of having both diene phosphate and fluorinated diene is better, that is, the ability of the two when present at the same time is significantly higher than that of any single component, and as the amount of the two increases, the dispersion effect is better.

[0068] Thermal storage stability test:

[0069] Take 30mL of imidacloprid aqueous suspension in an ampoule, seal it with a high-temperature flame, place it in a constant temperature box at 55°C for two weeks, cool it to room temperature, and measure the suspension rate before and after hot storage with reference to GB / T14825-2006.

[0070]

[0071]

[0072] Table 2:

[0073] It can be seen from the table that the dispersant prepared by the present invention has a good suspension effect. In addition, the imidacloprid aqueous suspension prepared by Comparative Examples 1 and 2 is greatly affected by the hot storage process, and the imidacloprid aqueous suspension prepared by Examples 1-5 has little change in suspension rate before and after hot storage. Therefore, the imidacloprid aqueous suspension prepared by the present invention also has good hot storage stability.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a polycarboxylate dispersant, characterized in that: The preparation method is as follows: (1) Add 2-allylpent-4-enylamine to ethanol solvent, stir and mix evenly, then add 4-bromo-1-butanol, react at 70-80°C for 24-36 hours. After the reaction is completed, remove the solvent, wash with ether, and dry to obtain intermediate 1; (2) adding the intermediate product 1 and 1,3-propane sultone to a methanol solvent, reacting at 60-65°C for 24-30 hours. After the reaction is completed, filtering under reduced pressure, washing with ether, and drying to obtain an intermediate product 2; (3) Add the intermediate product 2 and triethylamine to dichloromethane solvent, stir and mix evenly, then add perfluorooctanoyl chloride, control the temperature to 0-10°C, react for 20-30 hours, filter and dry after the reaction to obtain fluorinated diene; (4) Add acrylic acid, methyl methacrylate and allyl polyethylene glycol into a flask, stir and disperse, then add diene phosphate, fluorinated diene, inhibitor and initiator and stir and mix evenly, heat to 70-85°C, react for 6-10 hours, and after the reaction is completed, cool to room temperature, and use 30% by mass sodium hydroxide aqueous solution to adjust the pH to 7-9 to obtain a polycarboxylate dispersant.

2. The method for preparing a polycarboxylate dispersant according to claim 1, wherein In the above (1), the molar ratio of 2-allylpent-4-enylamine to 4-bromo-1-butanol is 1:1-1.

2.

3. The method for preparing a polycarboxylate dispersant according to claim 1, wherein In the above (2), the molar ratio of the intermediate product 1 to 1,3-propanesultone is 1:1-1.

5.

4. The method for preparing a polycarboxylate dispersant according to claim 1, wherein In the above (3), the molar ratio of the intermediate product 2, triethylamine and perfluorooctanoyl chloride is 1:1-1.4:1-1.

2.

5. The method for preparing a polycarboxylate dispersant according to claim 1, characterized in that: In the above (4), the molar ratio of acrylic acid, methyl methacrylate, allyl polyethylene glycol, diene phosphate, and fluorinated diene is 0.5-1.2:0.1-0.4:1:0.1-0.5:0.1-0.

5.

6. The method for preparing a polycarboxylate dispersant according to claim 1, wherein: In (4), the polymerization inhibitor is hydroquinone, and its usage is 0.3-0.7% of the mass of allyl polyethylene glycol; the initiator is potassium persulfate, and its usage is 0.3-0.6% of the mass of the total monomers.

7. The method for preparing a polycarboxylate dispersant according to claim 1, characterized in that: In the above (4), the preparation method of diene phosphate is as follows: The intermediate product 2 is added to carbon tetrachloride solvent, stirred and dispersed, and a carbon tetrachloride solution of phosphorus pentoxide is added thereto at 40-45°C, and the temperature is raised to 60-70°C for reaction for 3-6 hours. After the reaction is completed, deionized water is added thereto, and the hydrolysis reaction is carried out for 1-2 hours. The solvent is removed, and finally deionized water and ether are added thereto for extraction and distillation to obtain diene phosphate.

8. The method for preparing a polycarboxylate dispersant according to claim 7, characterized in that: The molar ratio of the intermediate product 2 to phosphorus pentoxide is 1:1-1.

5.

9. Use of the polycarboxylate dispersant according to any one of claims 1 to 8 in pesticides.

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