Preparation of modified β-CD and flame retardancy of EP

doi:10.16265/j.cnki.issn1003-3033.2020.07.016

Abstract

Abstract: In order to develop single molecule flame retardant to improve flame retardancy of EP, phosphate diacid chloride (SPDPC) was prepared by using pentaerythritol (PER) and phosphorus oxychloride (POCl₃). Then different amounts of SPDPC was applied to modify β-CD. Finally, EP/mβ-CD composite was made by adding modified β-CD (mβ-CD) into EP (amount of addition was 25% based on EP quality). The results show that the mβ-CD prepared with 1∶8 molar ratio of β-CD to SPDPC has good compatibility in EP matrix, and it increases amount of char residue of EP in nitrogen atmosphere to 26.7% from 15.3%. EP oxygen index also rises from 19.5% to 28.2%. Vertical combustion of EP/mβ-CD composite reaches V-0 level, and its total heat release (THR) and peak of heat release rate (PHRR) are reduced by 50.4% and 47.9% respectively comparing to pure EP while peak of smoke production rate (PSPR) and total smoke production (TSP) reduced by 12.5% and 52.8%. Moreover, such composite with above mβ-CD could form a stronger char layer.

Key words: β-cyclodextrin(β-CD), epoxy resin(EP), thermal degradation, flame retardancy, amount of char residue

CLC Number:

X937

HAN Ji, SHAN Xueying, SHAO Hui, GUO Hui, LI Jinchun. Preparation of modified β-CD and flame retardancy of EP[J]. China Safety Science Journal, 2020, 30(7): 107-113.

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