甲阶酚醛树脂的贮存稳定性

Storage Stability for Phenolic Resol Resin

甲阶酚醛树脂在贮存过程中容易自缩聚,稳定性低。采用两种方法对其进行改性:一种是引入氯丙烯以降低羟甲基活性,另一种是合成高邻位酚醛树脂并加入聚乙二醇。通过红外光谱(FT-IR)、差示扫描量热法(DSC)分别表征了改性前后树脂的基团变化、热性能,并进行了固化动力学分析,考察了酚醛树脂的黏度变化以研究其贮存性能。研究表明:成功地运用这两种方法合成了改性树脂,且热分析结果说明羟甲基的活性有所减弱;固化动力学结果表明树脂活化能变化较小,说明树脂贮存稳定性提高且对固化影响不大,烯丙基改性将酚醛树脂的贮存期由30d提高到108d,聚乙二醇改性后也可以贮存至108d。

During storage self-condensation is easy to occur for phenolic resol resin with low stabilityIn this article,two ways were used to modify the phenolic resol resins. One was to decrease the activation ohydroxymethyl by introduction of allyl chloride, the other was to introduce polyethylene glycoland tsynthesize high ortho phenolic resol. The change of functional groups in phenolic resol resins before anafter modification was characterized by infrared spectroscopy （FT-IR）. The thermal properties and thcuring kinetics were characterized by differential scanning calorimety （DSC）. The storage properties of thphenolic resol resins were observed by viscosity. The results indicated that two modified phenolic resoresins were successfully prepared and the hydroxyl group activation was decreased, while the activatioenergy was changed little as showed by the curing kinetics,which indicated the increase in storage stabilitwith less effect on curing. The storage period of the phenolic resin after modification by allylation could bincreased from 30 d to 108 d. After modification by polyethylene glycol, the storage period also reache108 d.