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Method for preparing dissaving vinyl or propenyl amide polymer

A technology of acrylamide and vinyl, which is applied in the field of synthesis of water-soluble vinyl or acrylamide polymers, can solve the problems of not obtaining branched polymers, and achieve the effect of easy control of polymerization reactions

Active Publication Date: 2010-04-14
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

preparation example Construction

[0015] The method for preparing hyperbranched vinyl or acrylamide polymer of the present invention comprises the following steps:

[0016] 1. Prepare the monomer phase: add the monomer into the polar solvent and mix evenly to form the monomer phase;

[0017] 2. Prepare the follow-up phase: add the diene compound into the polar solvent, mix well to form the follow-up phase;

[0018] 3. Add a certain amount of initiator and chain transfer agent for RAFT polymerization into the monomer phase, and gradually add subsequent phases into the monomer phase during the polymerization process to prepare hyperbranched polymers with high conversion.

[0019] The method adopts the reversible addition-fragmentation transfer (RAFT) polymerization method, because a special chain transfer agent with a high chain transfer constant is used in the RAFT polymerization process, and the chain transfer agent undergoes reversible addition-fragmentation regeneration transfer with the propagating free rad...

Embodiment 1

[0027] 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 heat up after purging nitrogen to remove oxygen to 60°C; dissolve 0.77 parts of N, N'-methylenebisacrylamide in 50 parts of buffer solution, and install it on a micro-syringe pump; weigh 0.0380 parts of ammonium persulfate, dissolve it in a small amount of water and add it to the acrylamide solution Initiate polymerization; start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours; after the dropwise addition of N,N'-methylenebisacrylamide , let the polymerization system continue to react for 30 minutes and then stop the reaction to obtain hyperbranched polyacrylamide.

[0028] In this example, the conversion rate of the polymerization system was 99.9%. The molecular weight, intrinsic visc...

Embodiment 2

[0030] Add 7.1 parts of acrylamide, 50 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0453 parts of 3-benzylmercaptothiocarbonyl propionic acid (BCPA) into a 250ml three-necked flask, stir mechanically, and heat up after purging nitrogen to remove oxygen to 60°C; dissolve 0.5134 parts of N,N'-methylenebisacrylamide in 25 parts of buffer solution, and install it on a micro-injection pump; weigh 0.0190 parts of ammonium persulfate, and add it to the acrylamide solution in (1) Initiate polymerization; start the micro-injection pump, set the dropping rate, and drop N, N'-methylenebisacrylamide aqueous solution within 3 hours; drop N, N'-methylenebisacrylamide solution Finally, allow the polymerization system to continue to react for 30 minutes and stop the reaction to obtain hyperbranched polyacrylamide.

[0031] In this example, the conversion rate of the polymerization system was 89.4%. Its weight average molecular weight is 7.29×10 5 , the molecular weight dist...

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PUM

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Abstract

The invention discloses a method for preparing a dissaving vinyl or propenyl amide polymer, which can be used for preparing the dissaving vinyl or propenyl amide polymer with high conversion in a polar solvent system through reversible addition-fragmentation transfer polymerization by adopting a semi-continuous operating technique and using a diene monomer and a chain transfer agent with low proportion for RAFT polymerization. The polymerization process can be controlled easily and the molecular weight and distribution of the final product can be regulated and controlled.

Description

technical field [0001] The invention relates to a synthesis technology of water-soluble vinyl or acrylamide polymers, in particular to a vinyl or acrylamide polymer suitable for dispersion, adhesion, flocculation and rheology control and having a hyperbranched structure method of preparation. Background technique [0002] Vinyl or acrylamide polymers are widely used in sewage treatment, papermaking, printing and dyeing, mining, oil extraction, building materials and other major fields, including nonionic, anionic, cationic and amphoteric polymers. [0003] Currently widely used vinyl or acrylamide polymers such as acrylamide and its copolymers are mainly linear structures. ZL96115823.9 and ZL00111320.8 disclose adiabatic 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 ch...

Claims

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Application Information

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IPC IPC(8): C08F2/38C08F220/56C08F236/02
Inventor 王文俊王敦明李伯耿朱世平
Owner ZHEJIANG UNIV
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