碳酸镍对PP/MPP/PEPA膨胀阻燃体系的协同作用

Synergistic Effect of Nickel Carbonate on PP/MPP/PEPA IFR System

以碳酸镍(NC)为阻燃协效剂,采用多聚磷酸蜜胺(MPP)和笼状季戊四醇磷酸酯(PEPA)复配阻燃剂,制备了具有良好阻燃性能的无卤阻燃聚丙烯(PP/IFR)。研究了NC用量对PP阻燃性能的影响,并分析了其阻燃协同作用机理。结果表明,添加少量的NC即可显著提高PP的阻燃性能;当NC添加量为3%时,阻燃PP的氧指数高达37.5%。TGA、FT-IR分析和体式显微镜、SEM观测结果表明,添加NC可以催化MPP/PEPA间的酯化反应,形成更多的交联网络结构,促进PP/IFR体系成炭,形成更致密的炭层,从而提高材料的阻燃性能。

Intumescent flame retardant （IFR） polypropylene （PP） was prepared by using melamine polyphosphate （MPP） and 1-oxo-4-hydroxymethy1-2,6,7-trioxa-1-phosphabicyclo-octane（PEPA） as flame retardants and nickel carbonate （NC） as synergistic agent. The effect of NC content on flame retardancy and flame retardant synergistic mechanism was studied. It is found that a little quantity of NC can improve the flame retardance of PP remarkably; when the mass fractions of NC is 3%,the limiting oxygen index （LOI） of flame retardant PP is 37.5%. Fourier transform infrared spectrum（FT-IR） and thermogravimetry analysis （TGA） results and optical micrographs and scanning electron microscope （SEM） micrographs reveal that NC can catalyze esterification reaction between MPP and PEPA,form more P-O-C and P-O-P structure,increase the char residue and form much denser char to improve flame retardant performance of materials.