Preparation method of poly dimethyl allyl ammonium chloride

A technology of polydimethyldiallylammonium chloride and dimethyldiallylammonium chloride, which is applied in the field of industrial preparation of cationic quaternary ammonium salt homopolymerization products, can solve the problem of inability to evaluate the economical efficiency of PDMDAAC preparation process , Influence the production cost and the industrial application of the production process, and cannot explain the problems such as the cationic monomer DMDAAC process, so as to achieve good economy and applicability, good economy and industrialization foundation, and low production cost.
CN100506860CInactive Publication Date: 2009-07-01NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2009-07-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of polydimethyl diallyl ammonium chloride. It is based on the industrial cationic monomer DMDAAC aqueous solution obtained by a high-yield one-step clean preparation process as a raw material, adding persulfate as an initiator and Na4EDTA complexing agent at one time, controlling the reaction temperature under stirring, and controlling the initiation rate according to gradient temperature rise , initiate the polymerization reaction of monomer DMDAAC at a lower temperature, increase the degree of polymerization of the product PDMDAAC, improve the relative molecular weight, add an aqueous solution containing a small amount of initiator at a higher temperature in the later stage of the reaction to improve the monomer conversion rate in the product, and finally By controlling the amount of dilution water added, the solid content of the product is adjusted. The present invention is not only easy to obtain polymer products with higher relative molecular weight, but also has good economical and industrial bases for its preparation method; the initiation temperature is reduced, and the polymerization reaction is carried out under relatively mild conditions, which is easy to operate and low in production cost; PDMDAAC products with different solid contents and different uses can be obtained.
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Description

technical field The invention belongs to the industrial preparation technology of cationic quaternary ammonium salt homopolymerization products, in particular to a preparation method of polydimethyl diallyl ammonium chloride. Background technique Poly-Dimethyldiallyl ammonium chloride (PDMDAAC for short) is a cationic quaternary ammonium salt monomer. The poly product, its molecular structure and polymerization reaction formula are as follows: In the formula, n, m=2, 3, 4, .... PDMDAAC is an aqueous linear polymer with cationic quaternary ammonium salt groups, and it is also a cationic polyelectrolyte. PDMDAAC is white water-absorbing powder, soluble in water, methanol and glacial acetic acid, insoluble in other solvents. The product is generally an aqueous solution, but there are also dry powder products. At room temperature, the aqueous solution of PDMDAAC is stable in the range of pH 0.5-14. Because of its non-toxicity, good water solubility, high positive charge...

Claims

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