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以环氧丙烷-甲醛作为改性剂,合成了一种潜伏性EP胶粘剂用液态改性DCA(双氰胺)固化剂;然后以改性前后的DCA分别作为EP的固化剂,采用红外光谱(FT-IR)法、差示扫描量热(DSC)法和凝胶时间测定法等探讨了不同固化剂对EP胶粘剂性能的影响。结果表明:当体系的pH为9、固化工艺为“80℃/10min→130℃/60min”时,液态改性DCA对EP具有较高的反应活性,相应的单组分EP胶粘剂具有相对较好的综合性能,其固化温度降低了30℃左右且无黄变现象,并且其室温时有2个月左右的储存期、-5℃时有半年以上的储存期。
A new type of latent modified epoxy resin (DCA) was prepared by using propylene oxide-formaldehyde as a modifier. Then DCA (dicyandiamide) curing agent before and after modification was used as the curing agent of EP respectively. FT-IR) method, differential scanning calorimetry (DSC) and gel time measurement methods were used to investigate the effect of different curing agents on the properties of EP adhesives. The results showed that when the pH value of the system is 9 and the curing process is “80 ℃ / 10min → 130 ℃ / 60min”, the liquid modified DCA has high reactivity to EP, and the corresponding one-component EP adhesive has the relative The better overall performance, the curing temperature is reduced by about 30 ℃ and no yellowing, and its room temperature when there is about 2 months of storage, -5 ℃ when there are more than six months of storage.