聚磷酸铵热氧老化机理及寿命预测

Abstract

Abstract:

To study the effect of thermal-oxidative on the degradation of ammonium polyphosphate（APP）,an artificial accel-erated thermal aging treatment was performed on the APP of the two brands.The Fourier transform infrared spectroscopy and nuclear magnetic resonance were used to characterize the structural changes of APP after thermal oxygen aging.Differential scanning calorimetry predicted heat aging life.The results showed that after thermo-oxidative aging,APP gradually transformed into ammonium dihydrogen phosphate.During the aging process,the P—O—P bond was broken,the P=O bond was increa-sed,and the average degree of polymerization decreased.APP had a long life at room temperature and could reach about 100 years,furthermore,with the higher the average degree of polymerization,the longer the life.With the increase of the ambient temperature,the life is shortened,and the life at 50 ℃ was less than 10 years.The results of the study provided reference for the study of the aging mechanism and durability of the fire-resistant coating for intumescent steel structures.

Key words: ammonium polyphosphate, aging mechanism, life prediction, degree of polymerization

CLC Number:

O631.33

Chen Zhenbang,Yang Shousheng. Aging mechanism and life prediction of ammonium polyphosphate thermal-oxidative acceleration aging[J]. Inorganic Chemicals Industry, 2019, 51(3): 20-24.

老化温度/℃	老化时间/d
80	9	18	36	72	96	144
90	3	6	12	24	36	48
100	1	2	4	8	12	16
110	0.25	0.5	1	2	3	4

波数/cm^-1	注释	波数/cm^-1	注释
468	P=O对称变角	1 402	NH₄⁺中N—H不对称变角振动
546	P=O不对称变角	1 448	NH₄⁺中N—H不对称变角振动
908	P—（OH）₂对称伸缩	2 875	1 402 cm^-1倍频峰
1 097	P—（OH）₂反对称伸缩	2 918	1 448 cm^-1倍频峰
1 284	NH₄⁺中N—H对称变角振动	3 250	NH₄⁺中N—H反对称伸缩

项目	老化时间/d	A型APP		B型APP
项目	老化时间/d	放热/（W·g^-1）	α/%	放热/（W·g^-1）	α/%
110 ℃	0.25	20.28	7.30	3.71	1.38
	0.5	22.51	8.35	3.92	1.49
	1	42.04	17.49	8.11	3.73
	2	100.77	44.99	23.97	12.18
	3	144.11	65.28	41.22	21.38
	4	184.65	84.26	61.77	32.33
100 ℃	1	11.88	3.37	3.67	1.36
	2	28.71	11.25	5.78	2.48
	4	40.27	16.66	13.86	6.79
	8	136.72	61.82	30.02	15.41
	12	176.43	80.41	60.78	31.81
	16	212.89	97.49	100.18	52.81
90 ℃	3	19.49	6.93	6.46	2.85
	6	42.29	17.61	13.17	6.42
	12	68.77	30.01	24.42	12.42
	24	162.64	73.96	57.61	30.12
	36	193.60	88.45	99.59	52.50
	48	215.52	98.72	166.14	87.98
80 ℃	9	19.05	6.73	13.01	6.34
	18	39.16	16.14	21.74	10.99
	36	90.97	40.40	40.71	21.11
	72	182.53	83.27	85.05	44.75
	96	195.69	89.43	123.86	65.44
	144	210.05	96.16	161.99	85.76
未老化		4.68	0.00	1.12	0.00
完全老化		218.26	100.00	188.69	100.00

老化温度/℃	lg t		老化温度/℃	lg t
老化温度/℃	A型	B型	老化温度/℃	A型	B型
80	2.04	2.21	100	1.16	1.46
90	1.26	1.78	110	0.70	1.05

项目	lg t			t/a
项目	30 ℃	40 ℃	50 ℃	30 ℃	40 ℃	50 ℃
A型APP	4.54	3.95	3.39	94.0	24.2	6.8
B型APP	4.61	4.06	3.56	110.7	31.8	9.9

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Aging mechanism and life prediction of ammonium polyphosphate thermal-oxidative acceleration aging

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