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Preparation method of salt ion-tolerant block copolymer latex

A technology of block copolymers and ions, applied in the field of preparation of block copolymer latex, to achieve the effects of environmental friendliness, fast reaction speed, and simplified process equipment

Active Publication Date: 2021-03-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, there is no amphiphilic macromolecular RAFT agent containing both nonionic and ionic hydrophilic groups capable of achieving effective reversible addition chain scission chain transfer emulsion polymerization of vinyl monomers. , such as polystyrene polyvinylphenyltriethylammonium chloride diblock reversible addition scission chain transfer reagent 5 , A single-block reversible addition chain scission chain transfer reagent of ethylamine polydiethylmethacrylate 6 , Two-block reversible addition of poly(ethylene oxide) poly(diethylmethacrylate) ethylamine to chain scission chain transfer reagent 7 Wait

Method used

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  • Preparation method of salt ion-tolerant block copolymer latex
  • Preparation method of salt ion-tolerant block copolymer latex
  • Preparation method of salt ion-tolerant block copolymer latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 40 grams of water, 0.7 grams of amphiphilic macromolecular reversible addition chain scission chain transfer reagent (1), and 1 gram of styrene were added to the reactor, stirred and mixed, stirred, nitrogen gas was passed for 30 minutes, and the temperature was raised to 70 ° C. Add 0.01 gram of potassium persulfate to initiate polymerization, add an aqueous solution containing 0.2 gram of sodium hydroxide when reacting to 10 minutes, add 20 grams of butyl acrylate when reacting to 60 minutes, and then continue to polymerize for 2 hours to obtain salt-resistant intercalated segment copolymer latex.

Embodiment 2

[0039] Add 40 grams of water, 0.7 grams of amphiphilic macromolecular reversible addition chain scission chain transfer reagent (2), and 1 gram of styrene into the reactor, stir and mix, stir, nitrogen gas for 30 minutes, and heat up to 70 ° C. Add 0.01 gram of potassium persulfate to initiate polymerization, add an aqueous solution containing 0.2 gram of sodium hydroxide when reacting to 10 minutes, add 20 grams of butyl acrylate when reacting to 30 minutes, and then continue to polymerize for 2 hours to obtain salt-resistant intercalated segment copolymer latex.

Embodiment 3

[0041] 40 grams of water, 0.4 grams of amphiphilic macromolecular reversible addition chain scission chain transfer reagent (3), and 20 grams of styrene were added to the reactor, stirred and mixed, stirred, nitrogen gas was passed for 30 minutes, and the temperature was raised to 70 ° C. Add 0.006 gram of potassium persulfate to initiate polymerization, add 0.1 gram of sodium hydroxide aqueous solution when reacting to 30 minutes, add 1 gram of butyl acrylate when reacting to 120 minutes, and then continue to polymerize for 30 minutes to obtain salt ion intercalated segment copolymer latex.

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Abstract

The invention provides a preparation method for a salt ion-resistant block copolymer latex. An amphiphilic macromolecular reversible addition broken chain transfer reagent simultaneously containing anonionic hydrophilic polyoxyethylene group and ionizable carboxyl is used as an emulsifier for emulsion polymerization to perform copolymerization of vinyl monomers such as styrene, acrylate, methacrylate and the like. According to the method disclosed by the invention, an amphiphilic RAFT reagent of which a hydrophilic chain segment is a nonionic hydrophilic monomer containing an ionic hydrophilic monomer and salt ions at the same time is used as an emulsifier for emulsion polymerization, the molecular weight of the multi-block copolymer is controllable, the molecular weight distribution is narrow, the salt ion resistance stability of the product latex is good, and in the subsequent application and blending process of the product latex, instability and demulsification caused by the existence of salt ions are avoided. The method is simple in process equipment, short in reaction time, high in conversion rate and good in latex stability, can be applied to the fields of water-based paint,modified concrete and the like needing to be added with inorganic filler, and has a good industrial application prospect.

Description

technical field [0001] The present invention relates to emulsion polymerization, in particular to a method for preparing salt ion-tolerant block copolymer latex by using reversible addition chain scission chain transfer emulsion polymerization. Background technique [0002] Reversible addition chain scission chain transfer active emulsion polymerization, also referred to as RAFT emulsion polymerization technology, its amphiphilic macromolecule reversible addition chain scission chain transfer reagent is the combination of small molecule reversible addition chain scission chain transfer reagent and hydrophilic monomer Polymerized with lipophilic monomers, the macromolecular reversible addition chain scission chain transfer is not only used as a chain transfer agent, but also as an emulsifier, which can be used for the reaction of emulsion polymerization to prepare block copolymers 1 . Compared with other traditional polymerization methods, it can control the molecular weight...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F212/08C08F220/18C08F2/38C08F2/24
CPCC08F2/24C08F2/38C08F212/08C08F220/18C08F293/005C08F2438/03
Inventor 罗英武陈缘
Owner ZHEJIANG UNIV
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