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Block polymeric dispersant and preparation method and application thereof

A technology of block polymer and dispersant, applied in the fields of botanical equipment and methods, applications, chemical instruments and methods, etc., can solve the problems of inability to obtain polymer compounds, weak ionic strength, and wide product molecular weight distribution.

Inactive Publication Date: 2017-03-15
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the distribution of hydrophilic and lipophilic groups in products prepared by random radical polymerization is random, and it is difficult to obtain polymer surfactants with specified structures and high charge densities.
CN200710025659.2 and CN200810146660.5 disclose free radical random copolymerization of unsaturated carboxylic acid and unsaturated monomer under the action of initiator to obtain polycarboxylate polymer dispersant. The reaction conditions are mild, but the molecular weight cannot be controlled. The 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.
[0006] 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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  • Block polymeric dispersant and preparation method and application thereof
  • Block polymeric dispersant and preparation method and application thereof
  • Block polymeric dispersant and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Monomer molar ratio: methacrylic acid MMA / polyethylene glycol methacrylate PEGMA / isooctyl acrylate EHA=1 / 1 / 2

[0023] Initiator: Benzoyl Peroxide BPO

[0024] Solvent: Isopropanol

[0025] Add 2 mmol of RAFT reagent, 0.1 mol of methacrylic acid and 0.1 mol of polyethylene glycol methacrylate PEGMA and 50 ml of isopropanol into a four-neck flask equipped with a stirrer, constant pressure drop tank, thermometer and condenser Solvent, stir and heat to 80°C, at this time the material melts, add 0.4mmol of initiator BPO in isopropanol solution dropwise within 30min, continue the reaction for 2h, add dropwise 0.1mmol of initiator BPO and 0.1mol of isooctyl acrylate in isopropyl alcohol Alcohol mixed solution, control the dropping time to 1h, continue to react for 2h after the reaction is completed, distill off the solvent under reduced pressure, neutralize with sodium hydroxide aqueous solution to pH 9-12, spray dry to obtain powder solid. That is the polymer dispersant SG-1....

Embodiment 2

[0027] Monomer molar ratio: methacrylic acid / styrene / butyl acrylate=2 / 1 / 1

[0028] Initiator: AIBN

[0029] Solvent: ethyl acetate

[0030] Add 2mmol of RAFT reagent, 0.2mol of methacrylic acid and 50ml of ethyl acetate into a four-necked flask equipped with a stirrer, a constant pressure drop tank, a thermometer and a condenser, stir and heat to 70°C, at this time the material melts, within 30min Add dropwise the ethyl acetate solution of 0.2mmol initiator AIBN, continue to react for 2h, add dropwise the ethyl acetate mixed solution of 0.2mmol initiator and 0.1mol styrene and 0.1mol butyl acrylate respectively, control the dropping time to be 1h, react After completion, the reaction was continued for 2 h, the solvent was distilled off under reduced pressure, neutralized with triethanolamine to a pH of 9-12, and spray-dried to obtain a powder solid. That is the polymer dispersant SG-2. The molecular weight is 27000, and the molecular weight distribution is 1.20.

Embodiment 3

[0032] Monomer molar ratio: maleic anhydride polyethylene glycol monomethyl ether (MPEG550) monoester / styrene / isobutyl acrylate=2 / 1 / 1

[0033] Initiator: 4,4-Azobis(4-cyanovaleric acid) ACVA

[0034] Solvent: ethanol

[0035] Add 2 mmol of RAFT reagent, 0.2 mol of maleic anhydride polyethylene glycol monomethyl ether and 50 ml of ethanol into a four-necked flask equipped with a stirrer, a constant pressure drop tank, a thermometer and a condenser tube, stir and heat to 80°C, at this time The material is melted, and the ethanol solution of 0.2mmol initiator ACVA is added dropwise within 30min, and the reaction is continued for 2h, and the ethanol mixed solution of 0.2mmol initiator, 0.1mol styrene and 0.1mol isobutyl acrylate is added dropwise, and the dropping time is controlled to be 1h After the reaction was completed, the reaction was continued for 2 h, the solvent was distilled off under reduced pressure, neutralized with aqueous sodium hydroxide solution to a pH of 9-12,...

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Abstract

The invention discloses a block polymeric dispersant and a preparation method and application thereof. The structural formula of the block polymeric dispersant is as defined in the specification. The preparation method comprises the following steps: using trithio ester with symmetrical structure as a RAFT reagent, using azo or peroxide as an initiator, through the copolymerization of unsaturation hydropathy monomer, preparing a polymeric surfactant of ABA-type structure with controllable structure and narrow molecular weight distribution. The application is as follows: the block polymeric dispersant is applied to a pesticide dry flowable. In the preparing process of the dry flowable, the polymeric dispersant has the dispersing and stabilizing functions. Under the relative action of ion pair, Lewis acid-base and hydrophobic group, a wetting agent is continuously replaced by the polymeric dispersant in the grinding process and the polymeric dispersant is firmly adsorbed to the particle surface, and amphipathy particles covered by the surfactant are stably suspended and dispersed in the water for a long time under the action of steric hindrance, solvatable chain and electrostatic repulsion, so the suspension percentage and physical stability of the dry flowable can be effectively improved.

Description

technical field [0001] The invention relates to a dispersant, in particular to a block polymer dispersant and its preparation method and application. Background technique [0002] Pesticide dry suspension concentrate (Dry Flowable, referred to as DF) is a kind of water dispersible granule (Water Dispersible granule, referred to as WG), which is a free-flowing pesticide formed by wet sanding and drying, and has a certain strength and is easy to disintegrate. , After dispersion, the suspension rate is high without dust, and the safe pesticide formulation is used. The dry suspension concentrate has the characteristics of convenience, safety, environmental protection and high efficiency in the production process and use process of the suspension concentrate, and also has the convenience of transportation and storage of the water-dispersible granule (dry method). The whole process of DF production can realize automatic airtight production, no dust, and high yield. It can be dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/52B01F17/36A01N25/30A01N25/14A01N43/84A01N47/34A01N43/653A01N43/707C09K23/52C09K23/36
CPCA01N25/14A01N25/30A01N43/653A01N43/707A01N43/84A01N47/34C09K23/00
Inventor 秦敦忠陈洪龄
Owner NANJING UNIV OF TECH
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