PE滴灌带耐老化性能研究

将线性低密度聚乙烯(PE–LLD)/高密度聚乙烯(PE–HD)/低密度聚乙烯(PE–LD)的滴灌带试样经过自然暴露老化,并对老化前后试样进行力学性能、流变性能及红外光谱测试分析以研究滴灌带的耐老化性能。结果表明:户外暴晒60 d后,纯PE(0#)试样的拉伸强度保持率和断裂伸长率保持率分别为81%和15.6%,已失去使用价值;而户外暴晒120 d后,1~#,2~#,3~#,4~#试样断裂伸长率保持率分别为61.9%,75.1%,82.3%,87.8%。毛细管流变10 min时,户外暴晒120 d试样扭矩保持率顺序为4~#3~#2~#1~#0~#试样;户外暴晒120 d后,试样红外谱图在1 757 cm~(-1)处生成的羰基峰从0~#~4~#依次向低波数移动,并且变得越来越弱。基于此,同时加抗氧剂、光稳定剂和炭黑复配使用的4~#试样耐老化性能最佳。

Study of Aging Resistance of Polyethylene Drip

The aging resistance of different formula of linear low density polyethylene (PE-LLD)/high density polyethylene (PE-HD)/low density polyethylene (PE-LD) drip irrigation zone samples was studied which was aged by natural exposure through mechanical properties,rheological properties and infrared spectroscopy test. The results show that the tensile strength retention and elongation at break of formula 0# sample for outdoor exposure 60 days is 81% and 15.6% which have lost their use value, while 1#,2#,3# and 4# are 61.9%,75.1%,82.3% and 87.8% that was exposured 120 days,respectively. The torque retention rate of outdoor exposure 120 days sample is 4# > 3# > 2# > 1# > 0# after the capillary rheometer for 10 min. From the outdoor exposure 120 days sample infrared spectrum,the carbonyl peak generated at 1757 cm-1 moves to the low wavenumber sequentially from 0# to 4# samples and becomes weaker and weaker. Based on this,while adding antioxidant,light stabilizer and carbon black compound formulations for 4 # sample,its anti-aging performance is the best.