Surface modification on ammonium polyphosphate and its enhanced flame retardancy in thermoplastic polyurethane
Surface modification on ammonium polyphosphate and its enhanced flame retardancy in thermoplastic polyurethane
复制标题
聚磷酸铵的表面改性及其在热塑性聚氨酯中的增强阻燃性能
DOI：
10.1002/pat.5299
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发表时间：
2021
影响因子：
3.4
通讯作者：
Gu Xiaoyu
中科院分区：
文献类型：
--
作者：
Zhang Jingfan;Wang Huqun;Sun Wenxiang;Zhang Zhiyuan;Li Hongfei;Zhang Sheng;Sun Jun;Gu Xiaoyu
聚磷酸铵(APP)是热塑性聚氨酯(TPU)中的一种有效阻燃剂。为了进一步提高APP的阻燃效果，先后用氧化石墨烯(GO)和三聚氰胺甲醛(MF)对APP进行包覆，最终产物MF-GO@APP在热塑性弹性体中的使用量为5wt%，试件在燃烧过程中滴落很少，达到UL-94V-0级，峰值发烟率由热塑性弹性体中的0.132 m~2/S降至0.051 m~2/S，降幅为61.4%。纯TPU烧掉后几乎没有残留物，但在5wt%MF-GO@APP的帮助下，还剩下24.4%的残炭。这些结果被认为是GO相对较高的导热系数，在加热过程中，GO将更多的热量传递给APP和MF，导致APP和MF的提前降解，MF和APP的分解产物相互交联，在基质上方形成更致密的炭。MF-GO@APP是一种综合膨胀型阻燃剂。
Ammonium polyphosphate (APP) is an effective flame retardant in thermoplastic polyurethane (TPU). In order to further enhance the flame retardant efficiency of APP, it was coated with graphene oxide (GO) and melamine formaldehyde (MF) successively, by using 5 wt% end product of MF‐GO@APP in TPU, the sample produced little dripping during burning and reached UL‐94V‐0 grade, peak smoke production rate was reduced from 0.132 m2/s in TPU to 0.051 m2/s, that was 61.4% decrease. Neat TPU burned out with little residue left, but by the help of 5 wt% MF‐GO@APP, 24.4 wt% of char was left. These results were tried to be analyzed as relative higher heat conductivity of GO, in heating GO transferred more heat to APP and MF, resulting in earlier degradation of APP and MF, the decomposed product of MF and APP cross‐linked together to form more compact char above substrate. MF‐GO@APP acted as an integrated intumescent flame retardant.