Method for synthesizing cationic polyacrylamide by using ultraviolet initiated template copolymerization method

Abstract

The invention relates to a method for synthesizing cationic polyacrylamide by using ultraviolet initiated template copolymerization method. The method comprises the following steps of: adding de-ionized water, an anionic polymer, a cationic monomer and an acrylamide monomer sequentially in a reaction device, stirring uniformly until the components are fully dissolved, so as to form a monomer water solution; adding a proper amount of a solubilizer and an initiator into the monomer water solution, stirring uniformly, adjusting pH (potential of hydrogen) value, charging high pure nitrogen into the reaction device in order to exhaust the air; then sealing the reaction device and putting into an ultraviolet reaction device to initiate the polymerization, so as to generate cationic polyacrylamide colloid; and finally, purifying, washing and refining the colloid, drying in a vacuum drying box and then grinding, thereby obtaining an end product. The method has the advantages that the polymerization initiation time is short, relatively few types of assistants are added and the temperature is not needed to control, thus the production technology can be simplified, the energy consumption can be reduced and the cost can be reduced; and the product synthesized according to the method is concentrated in distribution of cationic groups, is high in cationic degree and molecular weight, is high in purity and is non-toxic and harmless.

Description

technical field [0001] The invention relates to a method for synthesizing high molecular polymers in an aqueous solution, in particular to a method for synthesizing cationic polyacrylamide by using ultraviolet light to initiate template copolymerization. Background technique [0002] Flocculation and sedimentation method is a simple and economical water treatment method, and the choice of flocculant is the core of flocculation and sedimentation method. Polyacrylamide flocculant (Polyacrylamide in English, abbreviated as PAM is an important organic flocculant, which is widely used in the pretreatment process of sewage treatment and sludge dewatering. According to the ionic characteristics, polyacrylamide can be Divided into cationic polyacrylamide, English is Cationic polyacrylamide, abbreviated as CPAM, anionic polyacrylamide, English is Anionic polyacrylamide, abbreviated as APAM, nonionic polyacrylamide, English is Nonionic polyacrylamide, abbreviated as NPAM, amphoteric ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the temperature needs to be controlled at a constant temperature. If the temperature is too low, the reaction time will become longer, and if the temperature is too high, it will affect the heat dissipation of the polymerization reaction and consume energy; The "preparation method" is to add water to acrylamide monomer and quaternary ammonium salt with double bonds to form an aqueous solution system, add a chelating agent and an initiator to polymerize for 2 to 3 hours under the condition of 10 ° C ~ 40 ° C, and the rubber block obtained after the reaction Cationic polyacrylamide is obtained by granulation, drying and crushing

The disadvantage of this method is that the cations of the synthesized products are irregularly distributed on the molecular chain, the charge is dispersed, and the cationic effect cannot be well reflected in the application.

Moreover, temperature control is also required, and the polymerization reaction time is long