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Agricultural macromolecular surfactant and preparation method and application thereof

A technology of surfactants and polymers, applied in botany equipment and methods, applications, biocides, etc., can solve the problem that the distribution of functional groups cannot be effectively controlled, the molecular weight distribution of products is wide, the distribution of disordered hydrophilic groups and molecular structure, etc. problem, to achieve the effect of improving the suspension rate and stability over time, good emulsification and dispersion stability, and good steric hindrance

Inactive Publication Date: 2012-01-11
YANGZHOU SPED CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Common WDG / WP dispersant has lignin sulfonate, alkylnaphthalene sulfonate formaldehyde condensate, random copolymer polycarboxylate, as CN00131005.4 discloses the lignin through electrooxidation, in formaldehyde and sodium sulfite Under the action of sulfomethylation, the modified lignosulfonate formed by sulfomethylation cannot effectively guide the dispersant to adsorb on the pesticide particles because of the uncontrollable position of sulfonation, the disordered distribution of hydrophilic groups and molecular structure surface, providing stable dispersion stability
CN200610006327.5 discloses that alkylnaphthalene formaldehyde condensates are sulfonated under the action of sodium sulfite to form a class of dispersants. The sulfonic acid group of this class of dispersants cannot control the specific position, and also cannot meet the requirements of pesticides WDG or WP
CN200710025659.2 and CN200810146660.5 disclose the random copolymerization of unsaturated carboxylic acid and unsaturated monomer under the action of initiator to form a class of polycarboxylate polymer dispersant. Due to the adoption of free radical copolymerization technology, The reaction conditions are mild, but the molecular weight cannot be controlled, the molecular weight distribution is wide, and the required molecular sequence structure cannot be effectively obtained by controlling the feeding speed or order. Since the distribution of functional groups cannot be effectively controlled, the dispersant cannot effectively provide stable dispersion performance, and Practice has proved that its resistance to ionic strength is weak
[0004] The traditional free radical copolymerization technology is characterized by fast initiation, fast growth, high transfer, and fast termination. It is impossible to obtain polymer compounds with a specified structure. The molecular weight distribution of the product is wide, and the selectivity to raw materials and catalysts is wide.

Method used

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  • Agricultural macromolecular surfactant and preparation method and application thereof
  • Agricultural macromolecular surfactant and preparation method and application thereof
  • Agricultural macromolecular surfactant and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 1000 kilograms of water, 32.4 kilograms of S-dodecyl-S (methyl acetic acid) trithiocarbonate, 71 kilograms of acrylic acid and 86 kilograms of methacrylic acid into a clean 2000-liter reactor, and stir to heat up under nitrogen atmosphere To 90 degrees, 1.57 kg of benzoyl peroxide was dissolved in 30 kg of n-propyl acetate solution, the solution was added dropwise to the reaction system, the dropwise addition was completed in 1 hour, and the temperature was kept for 1 hour. In system, add 86 kilograms of methacrylic acid and 300 kilograms of methyl methacrylate, 3.86 kilograms of benzoyl peroxide are dissolved in 90 kilograms of n-propyl acetate solution, this solution is added dropwise to the reaction system at 90 degrees , the dropwise addition was completed in 2 hours, and the temperature was kept for 1 hour.

[0034] The above-mentioned materials were transferred to a 3000-liter reactor, and 240 kilograms of sodium hydroxide solution (mass concentration of 50%) ...

Embodiment 2

[0036]Drop into 600 kilograms of acetone, 8 kilograms of cumyl dithionaphthoate, 98 kilograms of maleic anhydride and 86 kilograms of methacrylic acid in a clean 2000-liter reactor, stir and be warming up to 80 degrees under a nitrogen-sealed environment, 1.0 kg of azobisisobutyronitrile was dissolved in 20 kg of acetone solution, the solution was added dropwise to the reaction system, the dropwise addition was completed in 2 hours, and the temperature was kept for 1 hour. In the system, add 86 kilograms of methyl acrylate and 366 kilograms of styrene, dissolve 2.3 kilograms of azobisisobutyronitrile in 40 kilograms of acetone solution, this solution is added dropwise to the reaction system at 90 degrees, and the dropwise addition is completed in 1 hour , keep warm for 1 hour.

[0037] Under the condition of 50-60 degrees, 240 kg of sodium hydroxide solution (mass concentration of 50%) was added dropwise within 1 hour, and the temperature was kept for 1 hour after the dropwise...

Embodiment 3

[0039] Put 1000 kg of water, 50 kg of OP-8 and 25 kg of SPAN-60 emulsifier, 86 kg of methacrylic acid and 142 kg of methyl acrylate monomer, 2.6 kg of PhC(S)CH(CH3 into a clean 2000-liter reactor ) Ph chain transfer agent, stir and be warmed up to 90 degrees under nitrogen sealing environment, drip 2.5 kilograms of potassium persulfate aqueous solution (containing 30% aqueous solution in potassium persulfate aqueous solution), drip in 2 hours, and keep warm for 1 hour. In the system, add 256 kilograms of butyl acrylate and 131 kilograms of vinylpyrrolidone, and dropwise add 8 kilograms of potassium persulfate aqueous solution (containing 30% aqueous solution in the potassium persulfate aqueous solution) under 90 degree conditions, dripping is completed in 1 hour, and is incubated for 1 hour. Hour.

[0040] Under the condition of 50-60 degrees, 42 kg of sodium hydroxide solution (mass concentration of 50%) was added dropwise within 1 hour, and the temperature was kept for 1 hou...

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Abstract

The invention discloses an agricultural macromolecular surfactant and a preparation method and application thereof, belonging to the technical field of surfactants. According to the invention, the block-type macromolecular surfactant is prepared by performing solution or emulsion polymerization on hydrophilic monomer and lipophilic monomer in a manner of employing a reversible addition fragmentation chain free radical copolymerization technology under the action of an initiator and a chain transfer agent, wherein the polymerization temperature is 50-150 DEG C and the polymerization pressure is 0.1-10 MPa. The macromolecular surfactant is applied in environment-friendly pesticide preparations. Hydrophilic groups with high charge density are bonded with the two ends of the macromolecular surfactant, and a hydrophobic long carbon chain is bonded with the other end of the macromolecular surfactant. According to the invention, the molecular weight and the molecular chain segment sequence structure of the macromolecular compound are intelligently controlled, and the molecular weight distribution is narrow. When being used in a pesticide preparation, the surfactant disclosed by the invention has the advantages of small dosage and good emulsion dispersion stability.

Description

technical field [0001] The invention discloses a method for preparing a BOLA type polymer surfactant with a block-type structure and a controllable molecular weight and its distribution by adopting a reversible addition-fragmentation chain transfer active radical copolymerization technology, and the surfactant is used in pesticides. The application in environment-friendly preparations such as water-dispersible granules, pesticide wettable powders, and suspending agents belongs to the technical field of surfactants. Background technique [0002] Pesticide water dispersible granules (WDG) or wettable powders (WP) are the original drug, dispersant, wetting agent and filler under the action of high-speed airflow, which are instantly mixed to realize the depolymerization of the original drug particles and the coating of the dispersant on the particles. surface; in the storage process, due to the electrostatic repulsion force, van der Waals force, intermolecular dispersion force a...

Claims

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Application Information

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IPC IPC(8): A01N25/30C08F293/00
Inventor 秦敦忠
Owner YANGZHOU SPED CHEM
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