木质素与含磷阻燃剂对环氧树脂固化物阻燃性能的影响

doi:10.3969/j.issn.1673-5854.2020.06.010

Abstract

Abstract:

A series of cured epoxy resin thermosets were prepared by co-curing of lignin, phthalic anhydride (PA), epoxy resin (EP) and 2-(diphenylphosphoryl) succinic acid (DPPOSA). The epoxy resin thermosets were studied and analyzed by limiting oxygen index(LOI), vertical burning test, cone calorimeter test(CONE), thermogravimetric analysis(TGA) and scanning electron microscopy(SEM). The thermal stability and flame retardancy of epoxy resin thermosets(P-12) were significantly improved when the EP content was 90.0%, the PA content was 6.5%, the DPPOSA content was 2.0%, and the lignin content was 1.5%. The flame retardant performance test showed that its LOI reached 34.6%, and the vertical burning test passed UL-94 V-0 level, and the heat release rate and total heat release were also effectively reduced. The results of TGA tests showed that DPPOSA and lignin could advance the degradation time and enhance char-forming ability. The results of SEM revealed that the epoxy resin thermosets formed a continuous, uniform and tight carbon layer, and it was further proved that the char-forming ability of epoxy cured thermosets were improved with the addition of lignin and DPPOSA.

Key words: epoxy resin thermosets, lignin, phosphorus-containing flame retardant

CLC Number:

TQ35
TQ317.5

Hongkun ZHANG, Zan LI, Xianyun GONG, Yang WANG. Properties of Co-cured Flame Retardant Epoxy Resin Materials Obtained by Lignin and Phosphorus-containing Flame Retardant[J]. Biomass Chemical Engineering, 2020, 54(6): 59-64.

Figures/Tables 5

Table 1

Table 2

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References 21

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试样 samples	点燃时间/s time to ignition	第一个峰the first peak		第二个峰the second peak		总热释放量/ (MJ·m^-2) total heat release	残炭量/% residual carbon content
试样 samples	点燃时间/s time to ignition	热释放速率/ (kW·m^-2) heat release rate	时间/s time	热释放速率/ (kW·m^-2) heat release rate	时间/s time	总热释放量/ (MJ·m^-2) total heat release	残炭量/% residual carbon content
P-4	60	232.8	105	496.1	165	98.6	7.2
P-9	50	336.2	130	373.9	185	90.6	7.6
P-11	49	315.8	70	304.2	250	88.8	17.2
P-12	45	254.9	65	286.5	250	84.3	15.6

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Properties of Co-cured Flame Retardant Epoxy Resin Materials Obtained by Lignin and Phosphorus-containing Flame Retardant

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试样 samples	固化物组成components/%				极限氧指数/% limiting oxygen index(LOI)	UL-94评级 UL-94 rating
试样 samples	EP	PA	DPPOSA	木质素lignin	极限氧指数/% limiting oxygen index(LOI)	UL-94评级 UL-94 rating
P-1	90.0	10.0	0	0	23.6	—
P-2	90.0	9.5	0	0.5	24.7	—
P-3	90.0	9.0	0	1.0	24.9	—
P-4	90.0	8.5	0	1.5	25.4	—
P-5	90.0	8.5	1.5	0	31.0	V-1
P-6	90.0	8.0	1.5	0.5	31.6	V-1
P-7	90.0	7.5	1.5	1.0	32.1	V-0
P-8	90.0	7.0	1.5	1.5	32.6	V-0
P-9	90.0	8.0	2.0	0	33.2	V-0
P-10	90.0	7.5	2.0	0.5	33.7	V-0
P-11	90.0	7.0	2.0	1.0	34.2	V-0
P-12	90.0	6.5	2.0	1.5	34.6	V-0