外力作用下聚氨酯胶粘剂在NaCl水溶液中的耐久性

李爱玲1;熊金平1*;张三平2;左禹1

北京化工大学学报(自然科学版) ›› 2008, Vol. 35 ›› Issue (2) : 42-46.

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北京化工大学学报(自然科学版) ›› 2008, Vol. 35 ›› Issue (2) : 42-46.
材料科学与工程

外力作用下聚氨酯胶粘剂在NaCl水溶液中的耐久性

  • 李爱玲;熊金平*;张三平;左禹
作者信息 +

Durability of polyurethane adhesive in NaCl solution under load

  • LI AiLing1;XIONG JinPing1;ZHANG SanPing2;ZUO Yu1
Author information +
文章历史 +

摘要

用聚氨酯胶粘剂和铝片制备胶接试样并在NaCl溶液中浸泡,考察了NaCl溶液的温度、NaCl的质量分数以及应力对胶粘剂粘结强度的影响。采用拉伸实验法测试胶接试样的拉伸剪切强度,分别用扫描电子显微镜图、红外光谱图分析浸泡前后胶层的表面形貌和胶粘剂分子结构的变化。结果表明,胶粘剂的粘结强度随载荷的增加而急剧下降,失效所需时间从1000N 的150h 快速降至2000N下的30h以下;在恒载荷时,失效所需时间从NaCl的质量分数为5%的60h上升至15%时的160h。温度的作用主要表现为在浸泡初期能加速聚氨酯胶粘剂的降解和粘结强度的下降,粘结强度从35℃的93.5%下降到70℃的65.0%左右;但是在浸泡中后期,则其作用变小,剪切强度维持在35℃时的64.0%、70℃时的63.0%和50℃时的44.0%。

Abstract

Samples of polyurethane adhesive bonded to aluminum were prepared and soaked in NaCl solution. The effects of varying temperature, NaCl concentration and load on the bonding strength of the adhesive were investigated. The tensile shear strength of the adhesive samples were measured by the lap shear strength test, and their surfaces were investigated by SEM and FT-IR. The results showed that the bonding strength of the polyurethane adhesive decreased rapidly with increasing load; for example, the failure time decreased significantly from 150h under a load of 1000N to 30h under a load of 2000N. With a constant load, the failure time increased from 60h in 5% NaCl to 160h in 15% NaCl. Increasing temperature accelerated the degradation of the polyurethane adhesive. The bonding strength decreased rapidly from 93.5% at 35℃to 65.0% at 70℃ in the early stages of immersion, while the effect of temperature was less marked in the middle and latter stages of immersion.The tensile shear strength was 64.0% at 35℃ and 63.0% at 70℃ but only 44.0% at 50℃. 

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李爱玲1;熊金平1*;张三平2;左禹1
.
外力作用下聚氨酯胶粘剂在NaCl水溶液中的耐久性[J]. 北京化工大学学报(自然科学版), 2008, 35(2): 42-46
LI AiLing1;XIONG JinPing1;ZHANG SanPing2;ZUO Yu1
.
Durability of polyurethane adhesive in NaCl solution under load[J]. Journal of Beijing University of Chemical Technology, 2008, 35(2): 42-46

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