|
Based on the mechanism of radical polymerization reaction , the use of composite initiator system and the low - temperature initiator technology , synthesis of the ultrahigh molecular weight hydrolyzed polyacrylamide . The low temperature insulation technology to ensure that the experimental results of a small trial with industrial scale has good correspondence between the small test formulation screening process . The focus of the study examines the polymerization conditions such as polymerization temperature, initiator concentration, ammonia, urea , monomer concentration and quality factors on the molecular weight of the polyacrylamide . Experimental formulation was optimized by orthogonal experiment , and the optimum polymerization process parameters , this small test ultra high molecular weight hydrolyzed polyacrylamide synthesized a molecular weight greater than 25 million . Make the hydrolyzed polyacrylamide having a good solubility in water , must have a suitable degree of hydrolysis . The experiments focused hydrolysis dosage , hydrolysis temperature , hydrolysis time and the amount of co-solvent molecular weight of partially hydrolyzed polyacrylamide , filter out the optimal conditions . Hydrolysis process based on after granulation alkali homopolymerization complex initiation system , according to the experimental results of a small test , by adjusting the polymerization conditions , proposed reasonable granulation equipment and technology , a better solution the HPAM plastic block made grain drying and other problems , successfully acrylamide polymerization industrial scale . Synthesis of a molecular weight of more than 22 million , the annual output reached more than 2,000 tons , the filter factor of less than 1.2 of ultra-high molecular weight of industrialized products , performance indicators are better than imported products .
|