聚乙烯醇降解工艺研究

Study on Polyvinyl Alcohol Degradation Process

降解聚乙烯醇作为一类新型防塌剂，表现出优良的防塌性能，它同时也可作为制备防塌性能更为优良的阳离子化聚乙烯醇类防塌剂的中间产物。以聚合度（DP）为指标，考察了聚乙烯醇降解工艺中反应时间、反应温度、H2O2（30％）用量、pH值对聚合度的影响，并在76-94℃温度范围内通过正交实验得出了降解聚乙烯醇最佳制备条件：pH为12，过氧化氢和聚乙烯醇的质量比m（H2O2（30％））：m（PVA）为1：2，反应时间为40min。

Degraded PVA can be used as a new type of anti-sloughing agent, which exhibits excellent performance of anti-collapse. It also can be used as intermediates of various cationic polyvinyl alcohol that has better performance if being used as anti-sloughing agent. The degree of polymerization （DP） can be used as an index to check the factors in PVA degradation process, such as the reaction time, reaction temperature, H2O2 （30%） dosage, pH value. And the best reaction conditions were obtained through orthogonal experiments under 76-94 ℃： the value of pH was 12, the ratio of m（H2O2 （30%）） ： m （PVA） was 1 ： 2, and the reaction time was 40 min.