不同温度下环氧树脂代木搪塑模具的固化过程

The Curing Process of Epoxy Resin Tooling Board for Slush Mold at Different Temperature

采用流变学的方法研究了环氧树脂代木搪塑模具在不同温度下的固化过程。为了找到合适的测试条件,首先研究了应变和振荡频率对环氧树脂代木搪塑模具的测试结果的影响。环氧树脂代木搪塑模具固化过程中,体系交联程度逐渐变大;在不同的固化阶段,固化程度的变化快慢不同,先缓慢增加,然后迅速增加,最后缓慢增加至平台值;储能模量和损耗模量的变化速度在不同阶段的变化与固化程度的变化相似,根据储能模量和损耗模量的最快增长速率与温度的关系得到体系的活化能约为27.2 k J/mol;随着固化温度升高,环氧树脂代木搪塑模具固化完全所需的时间减少,同时环氧树脂的施工容留时间也相应地减少。

The curing process of epoxy resin tooling board for slush mold with different temperature was studied by the rheological method. To find the suitable test condition, the influence of strain and oscillatory frequency on the curing process of epoxy resin tooling board for slush mold was investigated firstly During the process of curing, the degree of curing becomes larger with time. However, for different stages, the curing rate is different, from slow to fast and finally becomes slow again until plateau. This variation trend is also similar with the storage modulus and loss modulus. On the basis of the relation between the maximum increasing speed of modulus and the reaction temperature, the activation energy of epoxy resin tooling board for slush mold is calculated to be 27.2 kJ/mol. As the reaction temperature increases, the curing rate of the two- component epoxy resin for slush mold speeds up and less time is needed to finish the curing reaction of the epoxy resin. At the same time, the time which can be used to handle the epoxy resin for making mold becomes less with the increase of temperature.