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用双螺杆挤出机制备了聚丙烯/水镁石复合材料,研究了各组分及配比对复合材料性能的影响,并制备了管材。结果表明:水镁石用量为60%时,复合材料的氧指数才能达到28%以上,但冲击强度下降了近一半,拉伸强度下降了近2/3。氯化聚乙烯对聚丙烯/水镁石体系有明显的协同阻燃作用,加入5份氯化聚乙烯,其氧指数提高了2%以上,且其综合力学性能有一定提高。体系中加入β成核剂后生成了部分β晶,可提高复合材料的韧性,且对其他性能影响不大。所制备的聚丙烯/水镁石复合管材的氧指数为31.6%,维卡软化温度94.7℃,缺口冲击强度18.6kJ/m2,弯曲模量3.1GPa,弯曲强度32.3MPa,有望用作埋地高压电力电缆套管。
Polypropylene / brucite composites were prepared by twin-screw extruder. The effects of various components and proportions on the properties of the composites were studied and the pipes were prepared. The results showed that when the content of brucite was 60%, the oxygen index of the composite reached above 28%, but the impact strength decreased by nearly half and the tensile strength decreased by nearly 2/3. Chlorinated polyethylene has obvious synergistic flame retardant effect on polypropylene / brucite system. Adding 5 parts of chlorinated polyethylene increases the oxygen index by more than 2% and improves the comprehensive mechanical properties. Β-nucleating agent is added into the system to form partial β-crystal, which can improve the toughness of the composites and has little effect on other properties. The prepared polypropylene / brucite composite pipe has an oxygen index of 31.6%, a Vicat softening temperature of 94.7 DEG C, a notched impact strength of 18.6 kJ / m2, a flexural modulus of 3.1 GPa and a flexural strength of 32.3 MPa and is expected to be used as a buried high pressure Power cable casing.