Preparation of flame retardant EVA hot melt adhesive and its application in repairing cables

doi:10.19491/j.issn.1001-9278.2022.09.008

Abstract

Abstract:

In this article， a flame⁃retardant ethylene⁃vinyl acetate copolymer （EVA） hot⁃melt adhesive for quickly repairing aging cables was prepared， and the aluminum diethylphosphinate， dimelamine pyrophosphate and aluminum hydroxide were selected as flame retardant additives. EVA hot melt adhesive passed UL 94 V⁃0 rating without dripping and the limiting oxygen index was 27.1 vol% when the total loading amount of flame retardants was 50 wt% with the mass ratio of the above three flame retardants was 1：1：3. Compared with the pure hot melt adhesive， the heat release rate and total heat release of the prepared flame retardant hot melt adhesive was greatly reduced， and the flame retarded system exerted excellent synergistic flame retardant effect. The volume resistivity of the repared cable reached 3.12×10¹⁵ Ω·m. Moreover， the hot⁃melt adhesive exhibited excellent film⁃forming and adhesion on cable surface， and it will not crack or fall off during the bending process of the repared cable. The intumescent char layer is gererated on the cable surface and it can effectively protect the cable during combustion.

Key words: ethylene?vinyl acetate copolymer, hot?melt adhesive, cable repairing, flame retardant, volume resistivity

CLC Number:

TQ325

SONG Dejian, YU Peng, PENG Jinsong, XU Miaojun. Preparation of flame retardant EVA hot melt adhesive and its application in repairing cables[J]. China Plastics, 2022, 36(9): 53-56.

Figures/Tables 6

样品编号	ADP/ %	DMPY/ %	Al（OH）₃/ %	LOI/%	UL 94 等级	熔滴
1^#	0	0	0	17.0	无	有
2^#	10	0	0	21.2	无	有
3^#	10	10	0	23.2	V⁃2	有
4^#	10	10	10	24.1	V⁃2	有
5^#	10	10	20	26.3	V⁃0	有
6^#	10	10	30	27.1	V⁃0	无
7^#	13.3	6.7	30	28.2	V⁃0	无
8^#	6.7	13.3	30	25.4	V⁃0	有
9^#	15	5	30	28.9	V⁃0	无
10^#	5	15	30	25.1	V⁃2	有

Tab.1. Composition and flame retardancy of EVA hot melt adhesive

Fig. 1. Screenshot of 6 # sample vertical combustion （UL 94） test process

Fig.2. Heat release rate and total heat release curves of pure hot melt adhesive and flame retardant hot melt adhesive

Fig.3. Flame retardant hot melt adhesive and surface morphology of cables before and after repair

Fig.4. Burning state of the cable on the alcohol lamp before and after repair

Fig.5. Surface morphology and XPS spectrum of carbon layer after burning of repair cable

References 8

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