Product Description

The physical properties of poly (vinyl alcohol) by chemical structure, the influence of alcoholysis degree, degree of polymerization. The main structure of the polyvinyl alcohol molecules for 1, 3 - propanediol, namely "head, tail" structure. Degree of polymerization of polyvinyl alcohol are divided into high degree of polymerization (molecular weight *5 ~ *****0), a high degree of polymerization (molecular weight *7 ~ *****0), the degree of polymerization (*2 ~ *****0) molecular weight and low degree of polymerization (2.5 ~ ****0). Alcoholysis degree generally *8%, *8%, *8%. Partial alcoholysis of alcoholysis degree is *7% ~ *9%, often completely alcoholysis alcoholysis degree is *8% ~ **0%. Often take the average degree of polymerization of thousands, hundreds of digits in front, put the percentage of alcoholysis degree later, such as *7 degree of polymerization of ******8 tables, alcoholysis degree is *8%. In general, the degree of polymerization, solution viscosity increased, after the film strength and solvent resistance increased, but elongation decreased after the water solubility and film-forming.
Used in the manufacture of polyvinyl acetal, resistant to gasoline pipe and vinylon and fabric treatment agent, emulsifier, paper coating, adhesive, etc.