Method for preparing high molecular weight cationic polyacrylamide employing single-initiator

Abstract

The invention relates to a method for preparing high molecular weight cationic polyacrylamide employing single-initiator. The technical scheme comprises the following steps: mixing 10-90 parts of acrylamide and 10-90 parts of cationic monomer, keeping the temperature of raw materials to 0-10 DEG C, adding all initiator sodium pyrosulfite to react while adopting adiabatic method to realize naturaltemperature rise, keeping the temperature after the reaction, reducing the temperature to discharge, pelleting, drying, grinding and screening to prepare the cationic polyacrylamide power product which is very soluble in water. The beneficial effect of the invention is that the method has the advantage of less type of the used initiator, low dosage of the initiator, simple process, high molecularweight of the product, good solubility and the like, the method is applicable to industrialized production; and the method can overcome the defect of the traditional method that additive is added toomuch so that the secondary pollution is easy to cause and the using effect is affected.

Description

1. Technical field:

[0001] The invention relates to a method for preparing polyacrylamide, in particular to a method for preparing high molecular weight cationic polyacrylamide with a single initiator. 2. Background technology:

[0002] At present, cationic monomers for the production of cationic polyacrylamide products mainly include dimethyl diallyl ammonium chloride (DMDAAC), acryloyloxyethyltrimethylammonium chloride (DAC) and methacryloyloxyethyl Trimethylammonium chloride (DMC) and several others. Among them, when DMDAAC is used as a cationic monomer, it is difficult to produce a cationic polyacrylamide with a high molecular weight when the cationic degree is greater than 10%. There are few reports in the literature that the molecular weight exceeds 10 million. Poor, because the molecular weight is low, so the material sticks to the wall of the kettle and the toughness is poor, and it is difficult to discharge the material. It is not suitable to adopt the easiest indu...