摘要
两种镁基无机矿物粉体是绿色环保的天然产物,分别可以在热稳定性和抑烟性能方面实现更宽区间、更大范围优势互补,采用物理研磨法分别制备了水镁石粉(MH)和不同目数的水菱镁石粉(HM),并尝试将MH复配不同目数的HM粉体添加到聚氯乙烯(PVC)能源电线电缆中制备复合材料。利用极限氧指数、烟密度测试箱、万能力学实验机和热失重仪等对该PVC能源电线电缆的燃烧性能、烟密度、力学性能和热性能等进行了测试,并且使用拉曼光谱仪、扫描电子显微镜和能谱仪对最终的燃烧残炭进行了检测。结果表明,MH复配高目数HM能够在一定程度上提高PVC复合材料的阻燃特性,尤其是最大烟密度和烟密度等级分别下降了33.6%和42.9%;同时,可以有效地提高PVC能源电线电缆的热稳定性,体现在初始降解温度和热解50%时温度分别提高了5.3%和56.5%,且能够大幅提高燃烧后的残炭率,在600℃和800℃分别提升了3.6倍和4.3倍。MH和高目数HM复配添加还能够有效改善残炭的有序化程度,使得残炭更为致密连续,既能够有效地抵抗热流、质流和气流的传递,又能促进MgO在残炭表面的凝聚,有效提升物理阻隔效果。最后,物理法制备高目数镁基粉体价格低廉,综合应用成本低。
Two types of magnesium based inorganic mineral powders are green and environment-friendly natural products,which can complement each other's advantages in terms of thermal stability and smoke suppression performance,achieving a wider and larger range.High mesh brucite powder(MH)and different meshes of hydromagnesite powder(HM)were prepared by physical grinding.The combustion performance,smoke density,mechanical properties and thermal properties of the modified polyvinyl chloride(PVC)cable material were tested by using limiting oxygen index meter,smoke density test box,universal mechanical testing machine and thermogravimetric analyzer,and the final combustion carbon residue was tested in detail by using Raman spectrometer,scanning electron microscope and energy dispersive spectrometer.The results show that high mesh MH mixes with high mesh HM can improve the flame retardancy of PVC composites to a certain extent,especially the maximum smoke density and smoke density grade decreases by 33.6%and 42.9%respectively.At the same time,it can effectively improve the thermal stability of modified PVC cable materials,as evidences by an increase of 5.3%and 56.5%in the initial degradation temperature and pyrolysis tempera‐ture at 50%,respectively.The residual carbon rate can be significantly increased after combustion,which have increased by 3.6 times and 4.3 times at 600℃and 800℃,respectively.The addition of MH combined with high mesh HM can also effectively improve the degree of orderliness of residual carbon,making it more dense and continuous,the transitivity of heat,mass,and airflow can be inhibited.Especially,the agglomeration of MgO on the surface of residual carbon can be promoted,which can effectively improve the physical barrier effect.Finally,the physical method for preparing high mesh magnesium-based powders is inexpensive and has lower comprehensive application costs.
作者
彭鹤松
李海滨
邱文福
徐灵峰
陈超
PENG Hesong;LI Haibin;QIU Wenfu;XU Lingfeng;CHEN Chao(Jiangxi Guangyuan Chemical Co.,Ltd.,Ji′an 331500,China;School of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031,China;School of Chemistry and Chemical Engineering,Jinggangshan University,Ji′an 343009,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2024年第3期158-165,共8页
Engineering Plastics Application
基金
江西省自然科学基金项目(20232BAB204029)
关键词
多种镁基粉体
聚氯乙烯电缆材料
燃烧性能
抑烟性能
炭层有序化
various magnesium-based powders
polyvinyl chloride cable material
combustion performance
smoke suppression performance
carbon residue ordering
