Photo⁃oxidation Aging Performance and Life Prediction for High⁃density Polyethylene Pipe

doi:10.19491/j.issn.1001-9278.2021.06.006

Abstract

Abstract:

An artificial accelerated aging method was adopted to simulate the photo?oxygen aging process of high?density polyethylene （PE?HD） pipes and butt fusion joints under the natural sunlight. A UVA?340 standard fluorescent ultraviolet lamp was used to simulate the aging process in the two cycle modes of light and condensation at different temperatures of 50 ℃， 60 ℃ and 70 ℃. Infrared spectroscopy was also conducted to analyze the chemical structures of the aged pipe and joint samples. The results indicated that with an increase in aging time， the joint showed higher peak intensity for the olefin and carbonyl absorption in the joint than that in the pipe due to the increase of the photo?oxidation aging degree. Meanwhile， the oxidation induction time of pipes and joints were measured with different aging time at different temperatures. The oxidation induction time and the relationship between natural sunlight and fluorescent ultraviolet lamp irradiation were fitted by means of the kinetic curve linearization method， and a life prediction model for the natural light aging of high?density polyethylene pipes was proposed. The results indicated that the lifespan of PE?HD butt fusion joints exposed to the natural environment was 33.76 % shorter than that of the pipes at room temperature.

Key words: high?density polyethylene, pipe, butt fusion joint, photo?oxygen aging, oxidation induction time, life prediction

CLC Number:

TQ325.1⁺2

ZHAO Xingmin, ZHAO Jianping, YAN Jizhong. Photo⁃oxidation Aging Performance and Life Prediction for High⁃density Polyethylene Pipe[J]. China Plastics, 2021, 35(6): 33-39.

Figures/Tables 14

Fig.1. Sampling method

Fig.2. Photooxidation aging of the PE?HD

Fig.3. UV aging test equipment

Fig.4. Ageing cycle time

序号	黑板温度/℃	紫外光时间/h	冷暖温度/℃	冷凝时间/h
A	$50 ± 3$	10	$50 ± 3$	2
B	$60 ± 3$	10	$50 ± 3$	2
C	$70 ± 3$	10	$50 ± 3$	2

序号	黑板温度/℃	紫外光时间/h	冷暖温度/℃	冷凝时间/h
A	$50 ± 3$	10	$50 ± 3$	2
B	$60 ± 3$	10	$50 ± 3$	2
C	$70 ± 3$	10	$50 ± 3$	2

Tab.1. UV ageing cycle method

Fig.5. FTIR curves of pipes with different aging time

Fig.6. Characteristic band analysis of oxidation products

Fig.7. OIT of the samples at different test temperatures

Fig.8. OIT of the pipes and weld oxidation products at different aging time and different temperature

Fig.9. Relationship between ln P and t of the pipes and weld oxidation products at different temperature

材料	温度/K	公式	K/min^-1	A	lnK	r
管材	323	y=0.007 75-0.027 66x	0.027 39	1.007 780 109	-3.587 77	0.984 69
	333	y=-0.030 41-0.034 13x	0.033 43	0.970 047 732	-3.378 46	0.992 11
	343	y=-0.041 34-0.04 699 x	0.046 53	0.959 502 844	-3.057 82	0.990 25
接头	323	y=-0.010 41-0.035 13x	0.035 21	1.010 454 268	-3.349 55	0.995 23
	333	y=-0.036 23-0.046 15x	0.046 15	0.964 418 452	-3.075 86	0.999 69
	343	y=-0.120 51-0.056 28x	0.056 28	0.886 477 087	-2.877 42	0.985 62

Tab.2. Kinetic curve linearization constant

Fig.10. ln K of pipes and joints at different temperature

材料	公式	20 ℃下的lnK	相关系数
管材	y=5.458 43-2 928.564 18x	-4.536 669 59	0.962 14
接头	y=4.767 97-2 618.771 01x	-4.169 815 01	0.988 94

Tab.3. Fitting parameters

材料	K_常温	$A ˉ$	P	t/d	$β$	t₀/年
管材	0.010 709 1	0.979 110	0.052 436	273.32	10.44	7.82
热熔接头	0.015 455 1	0.953 783	0.058 179	180.97	10.44	5.18

材料	K_常温	$A ˉ$	P	t/d	$β$	t₀/年
管材	0.010 709 1	0.979 110	0.052 436	273.32	10.44	7.82
热熔接头	0.015 455 1	0.953 783	0.058 179	180.97	10.44	5.18

Tab.4. PE?HD pipe life prediction at room temperature

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