PE基木塑复合材料的阻燃研究

采用无卤阻燃剂聚磷酸铵(APP)以及阻燃协效剂硼酸锌(ZB)、硅藻土,制备具有良好阻燃性能的木塑复合材料。结果表明:APP在改善木塑复合材料阻燃性能的同时,可提高材料的热稳定性,当其用量为20份时,复合材料垂直燃烧达到UL94V-0级,此时,体系的力学性能变化不大;ZB、硅藻土对木塑复合材料的协效阻燃规律不同于对塑料的阻燃规律,添加2份硅藻土的阻燃体系形成的炭层最致密,可有效地隔热隔氧。

Study on the Fire-Retardant Properties of PE/Wood Powder Composites

Fire retardant ammonium polyphosphate （APP） and FR synergist zinc borate（ZB） and kieselguhr were applied to prepare flame retarding wood-plastic composites. The burning behavior was studied through horizontal-vertical burning and limiting oxygen index （LOI）. Thermogravimetric analysis （TGA） was employed to measure the thermal stability and the mechanical properties of the composites were tested statically. The results showed that APP enhanced the thermal stability of the composites significantly. When the APP content was 20 phr, the UL94 was V-0 rating, while the mechanical properties didn＇t change obviously. The synergistic effect of ZB and kieselguhr was not sharp, which indicated that the flame retardancy laws of them in wood-plastic composites were different from that in plastic. The SEM analysis demonstrated that the carbon layer of specimen of 2 phr kieselguhr was continuously denser and insulated heat and oxgen effectively.