摘要
采用熔融共混挤出法,制备了掺杂少量硬硼钙石(CB)或硼酸锌(ZB)的阻燃聚丙烯(PP)复合材料,研究了CB和ZB对填充蜜胺包覆聚磷酸铵(APP-102)、三聚氰胺氰尿酸盐(MCA)阻燃PP复合材料的燃烧性能、热稳定性、机械性能、熔融结晶性能的影响.结果表明:少量CB或ZB(质量分数为2.0%)能有效提高阻燃PP复合材料的阻燃性能,极限氧指数(LOI)从25.7%分别提高到27.6%和27.7%,UL-49等级从V-2提升到V-0,热释放峰值(pHRR)和总放热量(HRR)有一定程度的降低;CB和ZB有效改善了阻燃PP复合材料的热稳定性,燃烧时硼元素在表面促进形成连续紧密的炭层;少量CB或ZB的添加不仅没有劣化阻燃PP复合材料的机械性能,而且使拉伸模量、弯曲模量略有升高,同时提高了阻燃PP复合材料的结晶速率和结晶度.因此,CB与ZB类似,可被应用于PP的协同阻燃工艺.
The flame-retardant polypropylene(PP)composites doped with a small amount of colemanite(CB)or zinc borate(ZB)were prepared with the melt blending extrusion method.The influence of CB and ZB on the combustion properties,thermal stability,mechanical properties and crystallization of flame-retardant PP composites filled with melamine-coated ammonium polyphosphate(APP-102)and melamine cyanurate(MCA)were studied.The results showed that a small amount of CB or ZB(2.0%)can effectively improve flame retardancy of PP composites,the LOI value were improved from 25.7%to 27.6%and 27.7%respectively,the UL-94 rating was increased from V-2 to V-0,and the peak heat release(pHRR)and total heat release(HRR)were reduced slightly.CB and ZB could effectively improve the thermal stability of flame-retardant PP composites,and boron could promote the formation of a continuous and compact char layer on the surface.The addition of a small amount of CB or ZB did not deteriorate the mechanical properties of the flame-retardant PP composites,and the tensile modulus and flexural modulus were slightly increased.At the same time,the crystallization rate and crystallinity of flame-retardant PP composites with a small amount of CB or ZB were improved.Therefore,CB was similar to ZB and could be used in synergistic flame retardation of PP.
作者
李臻
杨丽庭
李彦涛
黄文杰
叶晋纶
曾聪
LI Zhen;YANG Liting;LI Yantao;HUANG Wenjie;YE Jinlun;ZENG Cong(School of Chemistry, South China Normal University, Guangzhou 510006, China;MBS Environmental Technology Corporation, Guangzhou 511483, China)
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2021年第2期35-43,共9页
Journal of South China Normal University(Natural Science Edition)
基金
广东省自然科学基金项目(2019A1515011389)
广东省高等学校珠江学者岗位计划资助项目(2019)。
作者简介
通信作者:杨丽庭,Email:yanglt@scun.edu.cn.
