High molecular weight amphoteric polyacrylamide and preparation method thereof

• Main Authors: ZHANG XINDONG, XUAN SHAOYUN
• Format: Patent
• Language: Chinese; English
• Published: 22.07.2022
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; IMPREGNATING OR COATING OF PAPER; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

The invention provides a preparation method of high molecular weight amphoteric polyacrylamide. The preparation method comprises the following steps: step 1, primary polymerization: reacting a first mixed monomer aqueous solution under the action of an initiator to form a primary polymer solution; step 2, secondary polymerization: reacting the second mixed monomer aqueous solution with the primary polymer under the action of a chain transfer agent and an initiator to form a secondary polymer solution; and step 3, tertiary polymerization: reacting the third monomer aqueous solution with the secondary polymer solution under the action of an initiator to prepare the high-molecular-weight amphoteric polyacrylamide. When the amphoteric polyacrylamide prepared by the preparation method disclosed by the invention is used for papermaking of paper, the water filtering effect of pulp can be effectively enhanced, and the bursting strength of finished paper is improved. 本发明提供一种高分子量两性聚丙烯酰胺的制备方法，包括以下步骤：步骤1，初次聚合：第一混合单体水溶液在引