摘要
利用HAAKE旋转流变仪研究了双组分聚氨酯胶粘剂的流变性质及固化过程中不同结构聚氨酯胶粘剂的凝胶时间与固化活化能,并通过差示扫描量热法(DSC)研究了样品的固化过程,分析了固化过程对胶粘剂流变性质的影响。通过Arrhenius公式推导得到聚氨酯胶粘剂的交联活化能。结果表明,预聚物的游离二苯基甲烷二异氰酸酯(MDI)含量越高、或分子量越高,聚合物的流体强度越强,固化反应速度越快,凝胶时间越短;提高固化温度可以促进交联反应的进行,缩短凝胶时间。
The rheological characteristics of two components polyurethane adhesives, gelation time and crosslinking active energy of different structures of polyurethane adhesives during curing process were studied by HAAKE rotational rheometer. The influence of curing process to adhesives was characterized by DSC. The crosslinking activation energy was obtained by the Arrhenius formula. The results indicate that when the molectlar weight of prepolymeror content of free diphenylmethane diisocyanate（MDI） is higher, the entanglement degree is higher, resulting in faster curing rate and shorter gelation time. Finally, the increase of curing temperature will promote the crosslinking reaction, shorten the gelation time.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第3期31-34,共4页
Polymer Materials Science & Engineering
基金
广东省省部产学研结合项目专项资金资助(2010B090400221)
关键词
聚氨酯
固化反应
凝胶时间
交联活化能
polyurethane
curing reaction
gelation time
crosslinking active energy
