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Open AccessArticle

Synthesis and Characterization of Aluminum 2-Carboxyethyl-Phenyl-Phosphinate and Its Flame-Retardant Application in Polyester

by Zhongying Yao 1,2, Xinxin Liu 3,†, Lijun Qian 1,2,*, Yajun Chen 1,2, Bo Xu 1,2 and Yong Qiu 1,2
School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China
Engineering Laboratory of Non-Halogen Flame Retardants for Polymers, Beijing 100048, China
National-Certified Enterprise Technology Center, Kingfa Science and Technology Co., Ltd., Guangzhou 510520, China
Author to whom correspondence should be addressed.
The joint first author.
Polymers 2019, 11(12), 1969;
Received: 10 October 2019 / Revised: 14 November 2019 / Accepted: 20 November 2019 / Published: 29 November 2019
A flame retardant aluminum 2-carboxyethyl-phenyl-phosphinate (CPA-Al) was synthesized through the salification reaction. The molecular structure of CPA-Al and thermal stability were characterized by solid nuclear magnetic resonance, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Subsequently, CPA-Al mixed in polyurethane was coated on polyester textile to obtain flame-retardant samples. The addition of 14.7 wt.% CPA-Al in textile sample can bring a limited oxygen index (LOI) value of 24.5%, 0 s after flame time, and the vertical burning B1 rating. Meanwhile, the incorporated CPA-Al reduced the peak heat release rate, total heat release, average effective heat of combustion, and increased the charring capacity of polyester textiles in contrast to the samples without CPA-Al. CPA-Al exerted not only its flame inhibition effect in gas phase, but also the charring and barrier effect in the condensed phase. Besides, with an increasing CPA-Al ratio in polyester textile, the contact angle gradually decreased from 123.6° to 75.6°, indicating that the surficial property of coating from hydrophobic to hydrophilic, thereby increasing the moisture permeability of polyester textile.
Keywords: polyester textile; flame retardant; coating; phosphinate polyester textile; flame retardant; coating; phosphinate
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Yao, Z.; Liu, X.; Qian, L.; Chen, Y.; Xu, B.; Qiu, Y. Synthesis and Characterization of Aluminum 2-Carboxyethyl-Phenyl-Phosphinate and Its Flame-Retardant Application in Polyester. Polymers 2019, 11, 1969.

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