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Terpolymer dispersant for pesticide environmental protection formulation, preparation method and application

A technology of terpolymer and dispersant, applied in botany equipment and methods, chemicals for biological control, applications, etc., can solve the problem of difficult control of molecular weight distribution, achieve enhanced interaction force and improve disintegration Speed, increase the effect of branched chain structure

Active Publication Date: 2016-03-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the polymer dispersants mainly used in pesticides on the market are polycarboxylate dispersants. Polycarboxylate dispersants have problems such as difficulty in controlling the molecular weight distribution during the synthesis process, which needs to be further improved.

Method used

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  • Terpolymer dispersant for pesticide environmental protection formulation, preparation method and application
  • Terpolymer dispersant for pesticide environmental protection formulation, preparation method and application
  • Terpolymer dispersant for pesticide environmental protection formulation, preparation method and application

Examples

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Effect test

preparation example Construction

[0057] The preparation method of the terpolymer dispersant is as follows: in the presence of emulsifier, initiator and chain transfer agent, 20-70 parts by weight of methacrylic acid, 20-60 parts by weight of acrylic acid The butyl ester and 20-50 parts by weight of N,N-dimethylacrylamide undergo emulsion radical polymerization reaction, and then add alkali solution to obtain the terpolymer dispersant.

[0058] The method specifically includes the following steps:

[0059] (1) Add an emulsifier of 0.5-2% of the total mass of the monomers, an initiator of 1-5% of the total mass of the monomers and an appropriate amount of water into the reactor;

[0060] (2) 20-70 parts by weight of methacrylic acid, 20-60 parts by weight of butyl acrylate, 20-50 parts by weight of N,N-dimethylacrylamide, and 1-5% of the total mass of monomer chains The transfer agent is mixed evenly to make a mixed solution A;

[0061] (3) Add the mixed solution A dropwise to the reactor described in step 1)...

Embodiment 1

[0073] Add 200g of deionized water, 5g of ammonium persulfate and 2g of sodium dodecylsulfonate into a 500ml four-neck flask equipped with stirring, heating, thermometer, reflux, feeding and nitrogen protection devices, stir to raise the temperature to 70°C, and then drop Add a mixed liquid containing 50g of methacrylic acid, 30g of butyl acrylate, 20g of N,N-dimethylacrylamide and 2g of mercaptoacetic acid, dropwise for 30min, keep warm for 3h after the dropwise addition, and then cool down to 40 ℃, then add 30wt% NaOH solution to the product to adjust the pH value to 7, and spray dry to obtain a solid product.

[0074] Gel chromatography coupled with laser light scattering, with 50mMNaH 2 PO 4 Solution and methanol mixture (70:30% (v / v)) was used as the mobile phase, polyethylene glycol 10,000 was used as the standard product, and the weight average molecular weight of the prepared copolymer dispersant was determined to be 17,500. image 3 Shown is the gel chromatogram of ...

Embodiment 2

[0090] Add 200 g of deionized water, 4 g of potassium persulfate and 0.5 g of sodium dodecylbenzenesulfonate into a 500 ml four-neck flask equipped with stirring, heating, thermometer, reflux, feeding and nitrogen protection devices, and stir to raise the temperature to 90 ° C. Then add dropwise the mixed liquid containing 30g of methacrylic acid, 50g of butyl acrylate, 20g of N,N-dimethylacrylamide, and 1g of ethyl mercaptoacetate for 20min, and keep the temperature for 2h after the dropwise addition, and then The temperature was lowered to 50° C., and then ammonia solution was added to the product to adjust the pH value to 7, and the product was spray-dried to obtain a solid product.

[0091] Gel chromatography coupled with laser light scattering, with 50mMNaH 2 PO 4 Solution and methanol mixture (70:30% (v / v)) was used as the mobile phase, polyethylene glycol 10,000 was used as the standard product, and the weight average molecular weight of the prepared copolymer dispersa...

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Abstract

The invention provides a terpolymer dispersing agent for an environment-friendly pesticide formulation as well as a preparation method and application of the terpolymer dispersing agent. The terpolymer dispersing agent is a copolymer salt formed by structural units shown in formulas A, B and C in a linear random arrangement mode according to a molar ratio of (25-75):(13-50):(20-54), wherein M is Na<+>, K<+> or NH4<+>; and the weight-average molecular weight of the terpolymer is 5000-50000. The polycarboxylate is prepared by carrying out an emulsion free radical polymerization reaction among monomers such as methacrylic acid, butyl acrylate and N,N-dimethyl acrylamide, and neutralizing with alkali liquor. The terpolymer dispersing agent has excellent dispersion stability and disintegration property, and in the process of synthesizing the dispersing agent, an organic solvent is not used, and emission of three wastes is avoided.

Description

technical field [0001] The invention relates to a polymer dispersant, in particular to a methacrylic acid / butyl acrylate / N,N-dimethylacrylamide terpolymer salt and a preparation method thereof. Background technique [0002] Polymer dispersant (also known as hyperdispersant) is a new type of dispersing aid, which was first developed to solve the problem of dispersing pigment particles in organic media. The polymer dispersant overcomes the disadvantages that the inorganic dispersant is easy to bring in impurity ions and the organic small molecule dispersant has weak adsorption and poor dispersion stability. At present, polymer dispersants have been widely used in pesticides, coatings, inks, printing and dyeing, plastic filling, ceramic dispersion, cement dispersion and other fields. [0003] In the application of pesticides, since most of the original pesticide particles are hydrophobic, they cannot be sprayed directly with water or evenly dispersed in other ways and covered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/18C08F220/54A01N25/30A01N25/04A01N25/14A01N43/70A01N43/653A01P13/00A01P1/00
Inventor 张强刘泽权
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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