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A kind of method for preparing starch-grafted cationic hyperbranched amide polymer

A starch grafting and polymer technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problem of not getting branched polymers, and achieve the effect of easy polymerization reaction and remarkable turbidity removal effect.

Active Publication Date: 2011-12-21
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

[0029] (1) Add 1.0 parts of carboxymethyl starch (CMS), 100 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0453 parts of 3-benzylmercaptothiocarbonylpropionic acid (BCPA) into a 250ml three-necked bottle, and mechanically Stir, pass nitrogen to remove oxygen, heat up to 60°C, and gelatinize for 30 minutes;

[0030] (2) Add 7.1 parts of acrylamide to the above aqueous starch solution;

[0031] (3) Dissolve 0.59 parts of N,N'-methylenebisacrylamide in 50 parts of water, and put it on a micro-injection pump;

[0032] (4) Weigh 0.020 parts of ammonium persulfate (APS), dissolve it in a small amount of water and add starch and acrylamide to the mixed solution to initiate polymerization;

[0033] (5) Start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours to obtain hyperbranched polyacrylamide;

[0034] (6) Weigh 8.66 parts of an aqueous solution of methacryloyloxyethyltrimethylammonium chloride...

Embodiment 2

[0043] (1) Add 0.6 parts of carboxymethyl starch (CMS), 100 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0272 parts of 3-benzylmercaptothiocarbonylpropionic acid (BCPA) into a 250ml three-necked bottle, and mechanically Stir, pass nitrogen to remove oxygen, heat up to 60°C, and gelatinize for 30 minutes;

[0044] (2) Add 7.1 parts of acrylamide to the above aqueous starch solution;

[0045] (3) Dissolve 0.45 parts of N,N'-methylenebisacrylamide in 50 parts of water, and put it on a micro-injection pump;

[0046] (4) Weigh 0.020 parts of ammonium persulfate (APS), dissolve it in a small amount of water and add starch and acrylamide to the mixed solution to initiate polymerization;

[0047] (5) Start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours to obtain hyperbranched polyacrylamide;

[0048] (6) Weigh 8.66 parts of an aqueous solution of methacryloyloxyethyltrimethylammonium chloride...

Embodiment 3

[0051] (1) Add 1.0 parts of corn starch (Maize), 100 parts of acetic acid-sodium acetate buffer solution (pH=5), 0.0453 parts of 3-benzylmercaptothiocarbonylpropionic acid (BCPA) into a 250ml three-necked bottle, and stir mechanically. After purging nitrogen to remove oxygen, heat up to 95°C and gelatinize for 30 minutes;

[0052] (2) Add 7.1 parts of acrylamide to the above aqueous starch solution;

[0053] (3) Dissolve 0.45 parts of N,N'-methylenebisacrylamide in 50 parts of water, and put it on a micro-injection pump;

[0054] (4) Weigh 0.020 parts of ammonium persulfate (APS), dissolve it in a small amount of water and add starch and acrylamide to the mixed solution to initiate polymerization;

[0055] (5) Start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours to obtain hyperbranched polyacrylamide;

[0056] (6) Weigh 8.66 parts of an aqueous solution of methacryloyloxyethyltrimethylammonium chlorid...

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Abstract

The invention discloses a method for preparing a starch graft cationic type hyperbranched vinyl or allyl amide polymer. The method comprises the following steps: preparing a mixed phase and a branching reagent phase, preparing a cationic monomer phase, gelatinizing the mixed phase at 25-95 DEG C for 0.1-1 hour, and adjusting the temperature to 40-80 DEG C; then adding a reversible addition-fragmentation chain transfer (RAFT) agent in the gelatinized mixed phase, adding an initiator to initiate a polymerization reaction; and finally adding the cationic monomer phase in a hyperbranched polymer system prepared from the mixed phase, and continuously reacting for 1-24 hours to obtain the starch graft copolymerization cationic type hyperbranched vinyl or allyl amide polymer. The method adopts the RAFT polymerization method and the semi-continuous polymerization technology and uses the diene monomer and the chain transfer agent with a low molar ratio to prepare the starch graft cationic typehyperbranched vinyl or allyl amide polymer in a polar solvent system with high polymerization rate and conversion rate, the polymerization reaction is easy to control and the turbidity removal effectof the product is remarkable.

Description

technical field [0001] The invention relates to a preparation method of a flocculant, in particular to a preparation method of a starch graft copolymerization cationic hyperbranched structure amide polymer suitable for dispersion, adhesion, flocculation and rheology control. Background technique [0002] Vinyl or acrylamide polymers are widely used in major fields such as water treatment, papermaking, printing and dyeing, mining, oil extraction, and building materials. Vinyl or acrylamide polymers widely used at present, such as polyacrylamide and its copolymers, mainly have a linear structure, but branched vinyl or acrylamide polymers are widely used in water treatment and the like. uncommon. As a natural polymer compound with abundant resources and low price, starch is widely used in many fields, and water treatment is one of them. CN1196334A discloses a method for preparing cationic amphoteric grafted polyacrylamide flocculants by using potassium permanganate to initiat...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F251/00C08F220/56C08F222/38C08F2/38C02F1/56
Inventor 王文俊王敦明李伯耿朱世平
Owner ZHEJIANG UNIV
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