HMW (High Molecular Weight) amphoteric polyacrylamide and preparation method thereof

• Main Authors: ZHANG XINDONG, XUAN SHAOYUN
• Format: Patent
• Language: Chinese; English
• Published: 13.11.2018
• 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 aims to prepare HMW (High Molecular Weight) polyacrylamide and aims to solve the problem of reduction of the effect of a paper reinforce caused by closed circulation of papermaking whitewater, poor secondary fiber raw material and the like. After the HMW polyacrylamide is used, the retention rate of fine fiber can be remarkably increased, the drainage property of paper pulp can be greatly increased, and the paper machine speed can be increased. The molecular weight of the HMW polyacrylamide can be up to 4000,000 to 6000,000, the polymer simultaneously contains (methyl)acrylamide, a cationic ethylene monomer, an anionic ethylene monomer, a structure modifier and a chain transfer agent. The concentration of the synthesized polymer is 20 percent, the potential measured by a PCD(Particle Charge Detector) after the polymer is diluted by 2000 times at 25 DEG C under a neutral condition is 200 to 300 mv, and the charge demand is 28 to 40 meq/g. 本发明的目的是制造种高分子量的聚丙烯酰胺，旨在解决目前造纸白水封闭循环，二次纤维原料变差等造成的纸张增强剂效果下降的