High molecular weight polyvinyl alcohol and preparation method thereof

• Main Author: CHOI NAM-SOO
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention provides high-molecular-weight polyvinyl alcohol and a preparation method thereof, and the method comprises the following steps: carrying out monomer polymerization by utilizing a photopolymerization method to obtain a polyvinyl ester polymer, and then carrying out saponification reaction on the polyvinyl ester polymer to obtain the high-molecular-weight polyvinyl alcohol with high-molecular-weight polymerization degree and excellent solution transmittance. The polyvinyl ester polymer is prepared by adopting a photopolymerization method, and a chain extender or an emulsifier is not contained in the process, so that impurities are not remained, and the reaction time can be shortened. Compared with a conventional polymerization method, the photopolymerization method has the advantages that the amount of soluble substances in the PVAc saponification waste liquid can be reduced, and the amount of insoluble substances in the PVA solution obtained by saponifying the PVAc can also be reduced, so that t