甲基取代二芳基氧化膦阻燃改性环氧树脂的研究

doi:10.11896/cldb.23040213

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Abstract Two new compounds, (4-methylphenyl) phenylphosphine oxide (4-MPO) and (2, 4-dimethylphenyl) phenylphosphine oxide (2, 4-DMPO) were synthesized by the reaction of phenylphosphorus dichloride (DCPP) with toluene and meta-xylene, respectively. The target compounds were introduced as reactive flame retardants into bisphenol A epoxy resin to prepare phosphorus-containing epoxy and flame retardant epoxy resin cured by 4, 4′-diaminodiphenylsulfone was further prepared. Thermal stability, flame retardancy, water absorptivity and dielectric property of the flame retardant epoxy resin were tested, and the flame retardant mechanism was studied. It was found that the two flame retardants can effectively improve the flame retardancy of epoxy resin, the 2, 4-DMPO exhibits higher flame retardant efficiency. The resulting flame retar-dant EP achieved a LOI of 31.5% and a UL-94 V-0 rating when the 4-MPO modified epoxy resin phosphorus content was 0.9% (mass fraction, the same below), while the flame retardant EP demonstrated a LOI of 30.3% and received a UL-94 V-0 rating when the phosphorus content of the 2, 4-DMPO modified epoxy resin was 0.6%. Compared with unmodified epoxy, the thermal stability, T_g and water absorptivity were slightly decreased, but the dielectric property was significantly improved.2, 4-DMPO modified epoxy resin showed higher flame retardancy and better dielectric property. The two flame retardants both act through gas phase and solid phase flame retardant mechanism, and the gas phase mechanism plays an important role.

Key words： epoxy resin flame retardant diphenylphosphine oxide dielectric property flame retardant property

Published: 25 August 2024 Online: 2024-09-10

CLC number:

TQ314.24

Fund:Natural Science Foundation of Shandong Province(ZR2020LFG002, ZR2020QB023).

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	Articles by authors
	WU Mei
	XU Xiaolei
	LI Xiao
	LIU Jiuhong
	YU Guangrui
	DUAN Haodong
	HAN Yuxi
	YU Qing
	WANG Zhongwei

Cite this article:

WU Mei,XU Xiaolei,LI Xiao, et al. Study on Methyl Substitued Diarylphosphine Oxide Flame Retardant Modified Epoxy Resin[J]. Materials Reports, 2024, 38(16): 23040213-10.

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http://www.mater-rep.com/EN/10.11896/cldb.23040213 OR http://www.mater-rep.com/EN/Y2024/V38/I16/23040213

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