Xuelian Liu, Jia Guo, Jun Sun, Xiaoyu Gu, Weihua Feng, Wei Liu, Hongfei Li*, Sheng Zhang*. The preparation of a bisphenol A epoxy resin based ammonium polyphosphate ester and its effect on the char formation of fire resistant transparent coating. Progress in Organic Coatings. 2019, 129, 349-356
https://doi.org/10.1016/j.porgcoat.2019.01.003
Abstract
This work reports the synthesis of an effective charring agent (ammonium polyphosphate ester (BAPPE)) and its application in preparing intumescent transparent fire resistive coatings. Bisphenol A epoxy resin reacted with diethanol amine to produce a waterborne epoxy resin (WEP), and then WEP was further reacted with orthophosphoric acid (PA) and urea (U) to obtain BAPPE. The chemical structure of BAPPE was confirmed by FT-IR and 1H NMR. Transparent fire resistive coating containing BAPPE and melamine urea formaldehyde (MUF) resin was prepared. The thermal gravimetric ****ysis showed that BAPPE could enhance char formation of the coating in the temperature range of 320–800℃. The flammability evaluation by simulated big panel method, **oke density test, and cone calorimeter (CONE) indicated that the presence of BAPPE significantly increased the fire resistant time, suppressed the **oke release amount, and remarkably reduced the peak heat release rate (pHRR) to 6.6 kW/m2. It was proved BAPPE could act as a three sources integrated reactive flame retardant in transparent coating. It is proposed that BAPPE can form cross-linking networks with MUF, thus enhancing the char formation upon heating and improving the fire resistance of the coating.
