摘要
文章通过聚乙烯醇(PVA)与硼酸(H3BO3)交联制备成水凝胶薄膜,添加焦磷酸三聚氰胺(MPP)提高PVA/MPP复合水凝胶薄膜的阻燃性能,当添加20 wt％MPP时,PVA阻燃性能达到UL-94 V-0级,MPP的加入可有效降低水凝胶薄膜的热释放速度(HRR)和发烟量.实验结果表明,MPP与PVA分子之间的氢键相互作用可以保持材料的力学性能,提高材料的阻燃性能.PVA/MPP水凝胶膜的阻燃机理是气相与凝聚相阻燃机理的协同作用,MPP分解为三聚氰胺和磷酸,然后三聚氰胺转化为N2和CO2,磷酸促进PVA水凝胶形成连续致密的炭层,阻碍了与外界的氧气和热量交换.
Abstract
In this work,Polyvinyl alcohol(PVA)was cross-linked via Boric acid(H3BO3)and prepared to be the hydrogel film.MPP is used to improve the flame retardant properties of the PVA hydrogel films.The experi-mental results showed that the PVA/MPP hydrogel films could achieve UL-94 V-0 rating with a 20 wt％addi-tion of MPP which could effectively reduce the HRR and the smoke emission of the PVA hydrogel films.The flame retardant mechanism of the PVA/MPP hydrogel films is a synergistic effect of gas-phase with condensed-phase flame retardant mechanism.MPP decomposed into melamine and phosphoric acid,then melamine conver-ted to N2 and CO2.Phosphoric acid promoted the PVA hydrogels formation of a continuous and dense char layer which hinders the exchange of oxygen and heat with the outside.At the same time,because of the interaction be-tween MPP and PVA,the mechanical properties of PVA are maintained while the flame retardancy of PVA is improved.
基金项目
Major Science and Technology Projects in Foshan(2016AG101374)
NETL
NSTL
万方数据