含P/N/Si木质素基阻燃剂的制备及其阻燃聚乳酸
Lignin-Based Flame Retardants Containing Phosphorus,Nitrogen and Silicon Elements for Flame Retardant Polylactic Acid
宋艳 1杨晓涵 1林肯 1单雪影 2李锦春1
作者信息
- 1. 常州大学材料科学与工程学院,江苏常州 213164
- 2. 常州大学环境科学与工程学院,江苏常州 213164
- 折叠
摘要
以碱木质素(Lig)为原料,3-氨丙基三甲氧基硅烷、4-(二乙氨基)水杨醛和9,10-二氢-9-氧-10-磷杂菲-10-氧化物为改性剂,通过三步法成功制备了一种含磷、氮、硅元素的木质素基阻燃剂(FR-Lig).热失重分析表明,与Lig相比,FR-Lig在空气中具有良好的热稳定性能和成炭能力,其T5%提高了45℃,550℃时的残留量由1.8%提高到 31.6%.然后将FR-Lig用于制备全生物基阻燃聚乳酸复合材料(FR-Lig/PLA),对材料的阻燃性能、热稳定性能、燃烧行为等进行了研究.结果表明,FR-Lig的加入可提高PLA的阻燃性能,当添加量为20%时,LOI值可增加至27.5%,垂直燃烧Ul-94过V-0级;即使质量分数10%的加入,也可使PLA的LOI值增加2个数值,UL-94由无等级提高至V-2级,对应PLA的拉伸强度为41.8 MPa,与纯PLA相比,冲击强度可提升约60%;而且,FR-Lig/PLA材料的热稳定性能、耐火性能和抑烟能力得到了提升.此外,残炭的表征及PLA的热重-红外联用分析表明,气相阻燃和凝聚相阻燃在PLA中共同发挥作用,以后者为主,并提出了可能的阻燃机理.
Abstract
Lignin-based flame retardant(FR-Lig)containing phosphorus,nitrogen and silicon elements was successfully prepared through alkali lignin(Lig)with 3-aminopropyl trimethoxysilane,4-(diethylamino)salicylal-dehyde and 9,10-dihydro-9-oxa-10-phosphorophenanthrene-10-oxide as modifiers by a three-step process.TGA re-sults of FR-Lig show that compared with Lig,FR-Lig presents good thermal stability and charring ability in air,with T5%increased by 45℃,and the residual at 550℃enhanced from 1.8%to 31.6%.FR-Lig was used to prepare fully bio-based flame retardant polylactic acid composites(FR-Lig/PLA),and the properties of FR-Lig/PLA were investigated in detail.It suggest that with the addditon of FR-Lig,the flame retardancy of PLA is improved.And with 20%FR-Lig loading amoun,the LOI value of PLA is increased to 27.5%,and the vertical combustion UL-94 passes V-0 level.Even if 10%FR-Lig can increase LOI of PLA by 2 values accompanied with UL-94 improving from no grade to V-2 grade;and the tensile strength of PLA reaches 41.8 MPa,and impact strength is increased by about 60%compared with pure PLA.Moreover,the thermal stability,fire resistance,and smoke suppression capa-bilities of PLA with 10%FR-LIg are enhanced.The analysis results of residual char and TG-IR for PLA show that both gas-phase flame retardancy and condensed phase flame retardancy work in PLA,in which the laterr plays a dominant role,and a possible flame retardant mechanism was proposed.
关键词
碱木质素/生物基阻燃剂/聚乳酸/阻燃性能/热稳定性能Key words
alkali lignin/biobased flame retardants/polylactic acid/flame retardancy/thermal stability引用本文复制引用
基金项目
江苏省科技厅产学研联合创新资金资助项目(BY2019080)
国家自然科学基金资助项目(51473024)
出版年
2024
NETL
NSTL
维普
万方数据