中温固化耐高温酚醛树脂的制备及性能

Preparation and Properties of Heat-resistant Phenolic Resin Cured at Medium Temperature

利用硼酸、有机硅预聚物对酚醛树脂进行改性,同时引入活性单体间苯二酚,制得了可中温固化的耐高温改性酚醛树脂。采用FTIR对改性酚醛树脂的结构进行了表征;通过DSC,TGA考察了固化行为和耐热性能;通过SEM考察了固化物的微观形态,并结合EDAX能谱仪对其元素成分进行了分析。将改性酚醛树脂与无机组合填料及多聚甲醛混合制得了耐高温酚醛胶黏剂,经过100℃固化后测试了胶黏剂的粘接强度和耐温性。结果表明,胶黏剂可在中温固化并具有良好的耐高温和粘接性能,1000℃下试样剪切强度可达1.7MPa。

Using boric acid and organic silicon prepolymer to modify phenolic resin,meanwhile introducing active monomer resorcinol,a kind of high temperature resistant phenolic resin which can be cured at medium temperature was prepared.The structure of the resin was characterized by fourier transform infrared spectroscopy（FTIR）.The curing behaviour and thermal stability were investigated by thermal analysis（DSC and TGA）.Scanning electron microscopy（SEM）and energy dispersive Xray analysis（EDAX）were used to study the microstructures and the distribution of elements.Modified resin and inorganic filler were mixed together and paraformaldehyde was used as curing agent,then the adhesive was obtained.After cured at 100℃,its thermal and bonding properties were tested.The result shows that the adhesive can be cured at medium temperature has outstanding high temperature resistant and bonding properties.The shear strength at 1000℃ can reach 1.7MPa.