摘要
采用[PW12O40]^3-离子柱撑插层共沉淀法合成的ZnAl硝酸根(NO3-ZnAl)层状双金属氢氧化物(LDHs),制备了PW12O40-ZnAl LDHs,并利用XRD、FTIR、电感耦合等离子体(ICP)、SEM等进行组成和结构的表征。将NO3-ZnAl LDHs和PW12O40-ZnAl LDHs分别与含聚磷酸铵、三聚氰胺、季戊四醇的膨胀阻燃剂(IFRs)复合阻燃环氧-聚酰胺树脂(EP-PA),采用TGA、背温实验和锥形量热实验评价不同ZnAl LDHs与IFRs复合阻燃EP-PA的热及烟气的释放规律。TGA结果表明,PW12O40-ZnAl-IFRs/(EP-PA)复合材料的最大降解速率最小,残炭率最高,说明PW12O40-ZnAl LDHs提高了IFRs/(EP-PA)复合材料高温下的抗氧化能力。背温实验表明,相同热辐射强度下,PW12O40-ZnAl-IFRs/(EP-PA)复合材料的背温达到200℃和300℃用时最长,具有最低的背温升温速率,说明PW12O40-ZnAl LDHs使IFRs/(EP-PA)复合材料耐火能力明显增强。从锥形量热实验数据可知,PW12O40-ZnAl-IFRs使PW12O40-ZnAl-IFRs/(EP-PA)复合材料具有最低的热释放速率峰值(PHRR)、平均热释放速率(MHRR)、平均有效燃烧热(MEHC)和总热释放量(THR),其火势增长指数(FGI)仅为IFRs/(EPPA)复合材料的14.5%,烟释放总量(TSP)比NO3-ZnAl-IFRs/(EP-PA)复合材料减少了27.6%,比IFRs/(EPPA)复合材料减少了55.3%。说明PW12O40-ZnAl-IFRs比NO3-ZnAl-IFRs更能有效地减少EP-PA的热量释放,抑制烟气生成。
The PW12O40-ZnAl layered double hydroxides(LDHs)was prepared by using[PW12O40]^3-ion pillared intercalation NO3-ZnAl LDHs.The composition and structure were analyzed by XRD,FTIR,inductively coupled plasma(ICP)and SEM.The flame retardant epoxy-polyamide resin(EP-PA)were prepared by NO3-ZnAl LDHs or PW12O40-ZnAl LDHs compound with intumescent flame retardants(IFRs)containing ammonium polyphosphate,melamine,pentaerythritol.The heat and smoke release rules of different ZnAl LDHs-IFRs flame retardant EP-PA were evaluated by back temperature experiment and cone calorimetry experiment.TGA result shows that the maximum degradation rate of PW12O40-ZnAl-IFRs/(EP-PA)composite is the lowest,and the carbon residue rate is the highest,which indicate that PW12O40-ZnAl LDHs improve the oxidation resistance of PW12O40-ZnAl-IFRs/(EP-PA)composite at high temperature.The back temperature experiment results show that under the same heat radiation intensity,the back temperature of PW12O40-ZnAl-IFRs/(EP-PA)composite reaches to 200℃and 300℃with the longest time and the lowest rate of back temperature rise.The results show that PW12O40-ZnAl LDHs can obviously enhance the fire resistance of EP-PA.From cone calorimetry experimental data,it can be seen that PW12O40-ZnAlIFRs makes PW12O40-ZnAl-IFRs/(EP-PA)composite have the lowest peak of heat release rate(PHRR),mean heat release rate(MHRR),mean effective heat of combustion(MEHC)and total heat release(THR).Its fire growth index(FGI)is only 14.5%of IFRs/(EP-PA)composite,and the total smoke production(TSP)is 27.6%lower than NO3-ZnAlIFRs/(EP-PA)composite and 55.3%lower than IFRs/(EP-PA)composite.The results suggest that PW12O40-ZnAlIFRs is more effective than NO3-ZnAl-IFRs in reducing the heat release and inhibiting the generation of flue gas.
作者
汤连东
吴袁泊
袁利萍
胡云楚
刘月姣
范友华
TANG Liandong;WU Yuanbo;YUAN Liping;HU Yunchu;LIU Yuejiao;FAN Youhua(College of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;School of Science,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Academy of Forestry,Changsha 410004,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2020年第9期2125-2136,共12页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(31670563)
湖南省高校生物质复合材料创新平台基金(18K058)。
关键词
ZnAl层状双金属氢氧化物
插层改性
环氧-聚酰胺树脂
阻燃
背温速率
ZnAl layered double hydroxides
intercalation modification
epoxy-polyamide resin
flame retardant
back temperature rate
