PVA涂布液的改性研究

PVA涂布液主要经历了耐水改性研究和纳米改性研究2个阶段。PVA耐水改性主要包括缩醛化改性、氨基树脂改性、尿素改性、硼酸改性、硅烷偶联剂改性、阳离子化改性等，纳米改性主要包括纳米SiO2改性、纳米CaCO3改性、纳米TiO2改性、层状硅酸盐改性等。改性PVA涂布膜具有较好的耐水性能、黏结性能、阻隔性能，价格相对便宜，且在加工和消费过程中，不会释放有毒有害物质，绿色环保，具有较好的市场发展前景。

Research on the Modification of PVA Coatings

The most common methods which have been used to modify the PVA coatings can be mainly divided into two phases- hydrophobically modified poly（vinyl alcohol） （PVA） solutions and nano modified-PVA coatings. Hydrophobically modified methods are comprised of acetal, amino resins, urea, boric acid, silane coupling agents and cationic. On the other hand, nano- SiO2, CaCO3, TiO2 particles and layered silicates are widely used to modify the PVA coatings. They offer an opportunity to explore new behaviors and functionalities beyond that of conventional materials such as water resistance, adhesive properties and barrier properties. Meanwhile, in the producing and consuming processes, modified PVA coatings will not release any toxic substances which show good marketing prospects.