摘要
为明确紫胶树脂受热后发生的粘流转变过程,以及粘流转变后其特征指标的变化,进而确定紫胶树脂热硬化时间和温度的对应关系,采用热台显微镜观测法监测了紫胶树脂的粘流转变过程,利用差示扫描量热法计算了粘流转变过程热力学参数,测定了粘流转变后的热硬化时间、冷乙醇可溶物和红外光谱中特征峰的变化情况;采用国标紫胶树脂热硬化时间的测定方法测定了不同温度下的热硬化时间,并进行了方程拟合。结果表明,升温速率快,紫胶树脂的粘流转变峰值温度越高,分子的传热效率越低,传热会产生滞后,并且拟合得到了紫胶树脂热硬化时间与温度的关系方程,并进行了显著性检验,发现紫胶树脂的热硬化时间随加热温度的升高而降低,其变化趋势按照所拟合方程所示的指数关系递减。
In order to clarify the viscous flow transition process of shellac resin after heating and the change of its characteristic index after over viscous flow transition,and to determine the corresponding relationship between thermal hardening time and temperature of shellac resin,the viscous flow transition process of shellac resin was monitored by differential scanning calorimetry and heat table microscope observation method,and the thermodynamic parameters of viscous flow transition process were calculated.The changes of thermal hardening time,cold ethanol soluble matter and infrared spectrum after viscous flow transformation were measured,and the thermal hardening time at different temperatures was measured by the method of thermal hardening time of shellac resin,and the equation was fitted.The results show that the faster the heating rate is,the higher the peak temperature of the viscous flow transition of the shellac resin is;the lower the heat transfer efficiency of the molecule is,and the heat transfer will lag;and the viscous lac resin has a smooth boundary and a water droplet shape.The relation equation between thermal hardening time and temperature of shellac resin was obtained by fitting,and the significance test was carried out.It was concluded that the thermal hardening time of shellac resin decreased with the increase of heating temperature,and the trend decreased according to the exponential relation shown in the fitting equation.
作者
冀浩博
唐保山
李冬丽
李坤
马金菊
JI Haobo;TANG Baoshan;LI Dongli;LI Kun;MA Jinju(Division of Science and Technology,Kunming Metallurgy College,Kunming 650033,China;Faculty of Environment and Chemical Engineering,Kunming Metallurgy College,Kunming 650033,China;Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650233,China)
出处
《昆明冶金高等专科学校学报》
CAS
2023年第2期68-74,共7页
Journal of Kunming Metallurgy College
基金
云南省教育厅科学研究基金项目:紫胶树脂与聚乳酸的共混改性研究(2023J1528)。
关键词
紫胶树脂
粘流转变
交联
滞后
热硬化
shellac resin
viscous flow transition
crosslink
lag
thermal hardening
