Method for preparing cation type hyperbranched ethylene or acrylamide polymer

A cationic, acrylamide technology, which is applied in the field of synthesis of water-soluble vinyl or acrylamide polymers, can solve the problems of not obtaining branched polymers, etc., and achieves convenient use, easy control of polymerization reactions, and low The effect of viscosity

Active Publication Date: 2011-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WO 99 / 46301 discloses the use of polyene monomers and appropriate proportions of mercaptans as chain transfer agents to obtain branched polymethyl methacrylates through traditional free radical polymerization, but the polymerization occurs at high conversion rates. cross-linked, no branched polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Add 7.1 parts of acrylamide, 100 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0453 parts of 3-benzylmercaptothiocarbonylpropionic acid (BCPA) into a 250ml three-necked flask, stir mechanically, and remove the After oxygen, the temperature was raised to 60°C;

[0042] (2) Dissolve 0.5133 parts of N,N'-methylenebisacrylamide in 50 parts of water and put it on a micro-syringe pump;

[0043] (3) Weigh 0.020 parts of ammonium persulfate (APS), dissolve in a small amount of water and add to acrylamide solution to initiate polymerization;

[0044] (4) Start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours to obtain hyperbranched polyacrylamide;

[0045] (5) Weigh 8.66 parts of an aqueous solution of methacryloyloxyethyltrimethylammonium chloride (80wt.%), add it into the above-mentioned hyperbranched polyacrylamide solution and continue to react for 240 minutes after purging nitrogen...

Embodiment 2

[0049] (1) Add 7.1 parts of acrylamide, 100 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0453 parts of 3-benzylmercaptothiocarbonylpropionic acid (BCPA) into a 250ml three-necked flask, stir mechanically, and remove the After oxygen, the temperature was raised to 60°C;

[0050] (2) Dissolve 0.5133 parts of N,N'-methylenebisacrylamide in 50 parts of water and put it on a micro-syringe pump;

[0051] (3) Weigh 0.020 parts of ammonium persulfate (APS), dissolve in a small amount of water and add to acrylamide solution to initiate polymerization;

[0052] (4) Start the micro-injection pump, set the drip rate, and after the N,N'-methylenebisacrylamide aqueous solution is added dropwise within 3 hours, hyperbranched polyacrylamide is obtained;

[0053] (5) Weigh 16.2 parts of an aqueous solution of acryloyloxyethyltrimethylammonium chloride (80wt.%), add it into the above-mentioned hyperbranched polyacrylamide solution and continue to react for 240 minutes after pu...

Embodiment 3

[0057] (1) Add 7.1 parts of acrylamide, 100 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0453 parts of 3-benzylmercaptothiocarbonylpropionic acid (BCPA) into a 250ml three-necked flask, stir mechanically, and remove the After oxygen, the temperature was raised to 60°C;

[0058] (2) Dissolve 0.60 parts of N,N'-methylenebisacrylamide in 50 parts of water, and put it on a micro-injection pump;

[0059] (3) Weigh 0.020 parts of ammonium persulfate (APS), dissolve in a small amount of water and add to acrylamide solution to initiate polymerization;

[0060] (4) Start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours to obtain hyperbranched polyacrylamide;

[0061] (5) Weigh 17.3 parts of an aqueous solution (80wt.%) of methacryloyloxyethyltrimethylammonium chloride and dissolve it in 20.0 parts of water, and add it to the above-mentioned hyperbranched polyacrylamide solution to continue the re...

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Abstract

The invention discloses a method for preparing a cation type hyperbranched ethylene or acrylamide polymer. The method comprises the following steps of: carrying out reversible addition-fragmentation transfer (RAFT) polymerization; and highly conversing in a polar solvent system by adopting a diene monomer and a chain transferring agent of the RAFT polymerization with low proportion through a semicontinuous operation process to prepare the cation type hyperbranched ethylene or acrylamide polymer. The polymerization process of the method is easily controlled, and molecular weights of a final product and distribution thereof can be controlled.

Description

technical field [0001] The invention relates to a synthesis technology of water-soluble vinyl or acrylamide polymers, in particular to a cationic vinyl or acrylamide suitable for dispersion, adhesion, flocculation and rheology control and having a hyperbranched structure Polymer preparation methods. Background technique [0002] Cationic vinyl or acrylamide polymers are widely used in important fields such as sewage treatment and paper making. [0003] Vinyl or acrylamide polymers widely used at present, such as acrylamide and its copolymers, mainly have a linear structure. ZL96115823.9 and ZL00111320.8 disclose adiabatic free radical polymerization of acrylamide under alkaline conditions and hydrolysis Synthetic ultra-high molecular weight (molecular weight>10 7 ) of anionic polyacrylamide. CN1446851A discloses free radical copolymerization of diallyl dimethyl ammonium chloride and pretreated acrylamide at 30-50°C to obtain a cationic polyacrylamide with a cationic de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F2/38
Inventor 王文俊王敦明李伯耿朱世平
Owner ZHEJIANG UNIV
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