固化温度对缓凝黏合剂固化时间和强度的影响

Effect of curing temperature on curing time and strength of adhesive

为研究固化温度对缓凝黏合剂固化时间和强度的影响,将缓凝黏合剂在固化温度分别为25、45、65、85℃的条件下养护。通过邵氏硬度试验研究了3种缓凝黏合剂在不同固化温度条件下的固化速率,测试了缓凝黏合剂在不同固化温度条件下的拉伸剪切强度、抗折强度和抗压强度。结果表明,固化温度越高,缓凝黏合剂固化时间越短,以25℃为基准,45℃条件下的固化时间缩短约50%,45℃以上,温度每升高20℃,固化时间缩短约10%;以25℃条件下的强度为基准,缓凝黏合剂在不同固化温度条件下拉伸剪切强度的变化率在6%内,抗折强度的增加率在6%~45%,抗压强度的增加率在9%~50%。

In order to explore the influence of curing temperature on the curing time and strength of an adhesive,the adhesive was cured at curing temperatures of 25,45,65,and 85℃.The curing rates of three types of adhesives at different curing temperatures were investigated through the Shore hardness test,and their tensile shear strength,flexural strength,and compressive strength of at different curing temperatures were measured.The results indicated that the higher the curing temperature,the shorter is the curing time.Taking 25℃as a benchmark,the curing time at 45℃was shortened by about 50%.At a curing temperature at above 45℃,the curing time was shortened by about 10%with an increase in temperature by every 20℃.In view of the strength at 25℃,the adhesives showed a change rate of tensile shear strength within 6%under different curing temperatures.Their increase rates in flexural strength and compressive strength were distributed in the ranges of 6%~45%and 9%~50%,respectively.