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Method for preparing starch grafted hyperbranched amide polymer

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

Active Publication Date: 2011-11-02
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

[0023] (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 0.5 hours;

[0024] (2) Add 7.1 parts of acrylamide to the above aqueous starch solution;

[0025] (3) Dissolve 0.59 parts of N,N'-methylenebisacrylamide in 50 parts of water, and put it on a micro-injection pump;

[0026] (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;

[0027] (5) Start the micro-injection pump, set the dropping rate, and add the N,N'-methylenebisacrylamide aqueous solution dropwise within 3 hours, and then continue to react for 0.5 hours to obtain hyperbranched polyacrylamide.

[0028] The results showed that the conversion rate ...

Embodiment 2

[0036] (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;

[0037] (2) Add 7.1 parts of acrylamide to the above aqueous starch solution;

[0038] (3) Dissolve 0.45 parts of N,N'-methylenebisacrylamide in 50 parts of water, and put it on a micro-injection pump;

[0039] (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;

[0040] (5) Start the micro-injection pump, set the dropping rate, and drop the N,N'-methylenebisacrylamide aqueous solution within 3 hours, and then continue to react for 1 hour to obtain hyperbranched polyacrylamide;

[0041] The results show that the conversion rate is 99.2%, th...

Embodiment 3

[0043] (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;

[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, and then continue to react for 1 hour to obtain hyperbranched polyacrylamide;

[0048] The results showed that the conversion rate was 98.7%...

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Abstract

The invention discloses a method for preparing a starch grafted hyperbranched amide polymer. The method is characterized by: preparing a mixed phase and a branching reagent phase, gelatinizing the mixed phase for 0.1-1 hour at a temperature of 25-95 DEG C, then adjusting the temperature to 40-80 DEG C, adding a RAFT chain transfer agent to the gelatinized mixed phase, then adding a initiator to initiate a polymerization; during the polymerization, adding the branching reagent phase to the mixed phase in a dropwise manner within 1-10 hours, and sequentially carrying out the reaction for 0.5-4 hours after completing the adding, finally, carrying out a high-conversion preparation to prepare the starch grafted hyperbranched amide polymer. With the present invention, diene monomers and the chain transfer agent with low ratio are provided for high-polymerization rate and high- conversion preparation of the starch grafted hyperbranched amide polymer in a polar solvent system by using a semi-continuous polymerization process through a reversible addition and fragmentation chain transfer polymerization; the polymerization is easy to be controlled and turbidity removal effect of the productis significant.

Description

technical field [0001] The invention relates to a preparation method of a flocculant, in particular to a preparation method of a starch-grafted hyperbranched vinyl or acrylamide 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 initiate starch or microcry...

Claims

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Application Information

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