粉状发泡胶固化工艺和动力学研究

Research on Curing Process and Cure Kinetic for a Powder Adhesive Foam

本文通过原材料选材和配方优化研发了可以在较低温度固化的耐高温粉状发泡胶。采用动态差示扫描量热分析(DSC)研究了发泡胶的固化特性。基于不同升温速率(β)下固化起始温度Tonset和峰值温度Tp的变化,获得了Tp对lnβ的线性方程,可以更合理地确定固化温度参数。发泡性能是蜂窝夹层结构制造中一项重要的工艺性能,在相同固化时间内、不同立方体试样填充密度的条件下研究了从100℃到150℃温度范围内发泡胶的发泡性能。Tp对lnβ的线性关系式可以用于解释表观活化能大小的变化规律,即表观活化能(Ea)约等于RT12/△T,并用极限的方法进行了上述简式的推导。

Heat-resistant powder adhesive foam with lower curing temperature were developed by material's selection and formula optimization.The curing properties of the adhesive foam had been investigated by dynamic differential scanning calorimetry(DSC)experiments to determine the curing process temperatures.Based on changes of the onset temperatures(expressed as T_(onset))or peak temperatures(expressed as T_(p))with different heating rate(β),a linear equation of T_(p) against lnβ was obtained to determine the curing temperature parameters more reasonably.As an important process performance in fabricating honeycomb sandwich structures,the foaming properties were investigated in the temperature range of from 100℃ to 150℃within the same curing time,and cubic samples filled with different densities.The above linear equation can be used to explain some laws of higher or lower of apparent activation energies(Ea),by which the apparent activation energy(Ea)is nearly equal to RT-(1)^(2)/△T which was derived by using method of mathematical limit.