Comb type polymeric dispersant and preparation method and application thereof
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A polymer dispersant and comb-shaped polymer technology, which is applied in the application field of pesticide film spreading oil agent, achieves the effects of wide application prospects, reduced usage, and reduced steric hindrance
Inactive Publication Date: 2017-03-15
NANJING UNIV OF TECH +1
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There are no reports in the literature on the preparation of oil dispersibles by wet sanding process, and then the method of adding diffusing agent to prepare SO
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[0022] The amount of RAFT reagent (dodecylthiocarbonylthiopropionic acid) accounts for 0.5% of the total effective substance molar ratio
[0023] Initiator consumption is 0.1% of the total effective substance molar ratio
[0024] Solvent: Isopropanol
[0025] Add XPEG1000, RAFT reagent and isopropanol into a four-neck flask equipped with a stirrer, constant pressure dropping tank, thermometer and condenser, stir and heat to dissolve the materials, when the temperature reaches 70°C, add styrene and acrylic acid dropwise The mixed solution of isooctyl ester and the isopropanol solution of the initiator azobisisobutyronitrile (AIBN) are added dropwise in 0.5-1h, and kept warm for 4h. After the reaction was completed, the solvent was replaced with methyl oleate, and the pH was neutralized to 4-6 with ethanolamine. The product is denoted as PC1 with a molecular weight of 2500...
[0028] The amount of RAFT reagent (dodecylthiocarbonylthiopropionic acid) accounts for 0.5% of the total effective substance molar ratio
[0029] Initiator consumption is 0.1% of the total effective substance molar ratio
[0030] Solvent: Acetone
[0031] Technology is with embodiment 1. The product is denoted as PC2 with a molecular weight of 31000 and a molecular weight distribution of 1.36.
Embodiment 3
[0033] Monomer molar ratio: maleic anhydride fatty alcohol polyether monoester (maleic anhydride and AEO-5 are esterified by 1:1 mole) / styrene / butyl acrylate=0.5:1:1
[0034] The amount of RAFT reagent (dodecylthiocarbonylthiopropionic acid) accounts for 0.5% of the total effective substance molar ratio
[0035] The amount of initiator BPO is 0.1% of the molar ratio of the total effective substance
[0036] Solvent: butanone
[0037] Technology is with embodiment 1. The product is denoted as PC3, the molecular weight is 28000, and the molecular weight distribution is 1.19.
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Abstract
The invention discloses a comb type polymeric dispersant and a preparation method and application thereof. The structural formula of the polymeric dispersant is defined in the specification. The preparation method comprises the steps that the RAFT living polymerization technology is adopted, dodecane sulfenyl sulfo-carbonyl sulfenyl propionic acid serves as a chain transfer agent, azodiisobutyronitrile serves as an initiator, and the comb type polymeric dispersant is obtained through graft copolymerization between unsaturated monomers. According to the application, the dispersant is applied to a spreading oil system, methyl oleate and other environment-friendly solvents are adopted as an organic carrier, an oil-dispersible system is obtained through a wet sanding process, a dispersing agent is added, and spreading oil of different conventional processes is obtained. According to the structure of the comb type polymeric dispersant, polyoxyethylene ether, benzene rings, carboxylic acid groups and other group repetitive units are contained, multipoint adsorption is achieved in the wet sanding process, the dispersant has good compatibility with an oil phase, the lubricating function among particles is improved, the collision probability among the particles is reduced through a macromolecular main chain steric hindrance, and sanding efficiency is improved.
Description
technical field [0001] The invention discloses a preparation method of a controllable polymerization "comb-shaped" polymer dispersant and an application in a pesticide film spreading oil. Background technique [0002] 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. The active ion polymerization technology has fast initiation, slow growth, slow transfer, and no termination, and can effectively obtain polymer compounds with specified structures. The narrow molecular weight distribution of the product is harsh on raw materials and reaction conditions. Reversible addition-fragmentation chain transfer living free radical polymerization technology (RAFT technology) regulates the concentration of act...
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