摘要
橡胶的硫化反应过程对制品的最终性能起决定性作用,而厚壁橡胶的硫化是典型的非等温硫化过程,通常难以通过实验测得的等温硫化曲线来直接确定制品的最佳硫化工艺。因此,利用数值模拟技术来研究硫化过程对于橡胶的成型加工具有重要意义。鉴于此,基于传统硫化动力学模型,通过引入初始硫化参数并将反应级数视为温度的二次函数,构建了精度更高的改进硫化模型,同时将橡胶热物性参数视为硫化度和温度的函数,基于C语言和FLUENT预定义宏编写了UDF子程序,实现了橡胶制品硫化过程传热与硫化的耦合模拟。针对典型厚壁橡胶制品的平板硫化成型,通过测温实验和不同硫化程度制品拉伸、DSC测试与断面形貌观测,验证了耦合算法对温度场和硫化度模拟的可靠性。该方法对指导厚壁且结构复杂橡胶制品硫化成型更具实际意义。
The vulcanization reaction process of rubber plays a decisive role in the final performance of the product,and the vulcanization of thick-walled rubber is a typical non-isothermal vulcanization process.It is usually difficult to directly determine the best vulcanization process of the product through the isothermal vulcanization curve measured by the experiment.Therefore,it is of great significance to study the vulcanization process of rubber molding by using numerical simulation technology.In view of this,based on the traditional cure kinetic modeling,an improved vulcanization model with higher accuracy was constructed by introducing initial vulcanization parameters and treating the order of reaction as a quadratic function of temperature.At the same time,the thermophysical parameters of rubber were regarded as a function of vulcanization degree and temperature.UDF(user defined function)subroutines were developed based on C language and FLUENT pre-defined macros,which realized the coupled simulation of heat transfer and vulcanization in the vulcanization process of rubber products.Aiming at the flat vulcanization molding of typical thick-walled rubber products,the reliability of the coupling algorithm for temperature field and vulcanization simulations is verified through temperature measurement experiments,product stretching of different vulcanization degrees,DSC testing and cross-sectional morphology observation.This method is more practical to guide the vulcanization molding of thick-walled and complex-structure rubber products.
作者
张梦飞
张玲
李晓闯
祖韵秋
黄明
石宪章
刘春太
ZHANG Mengfei;ZHANG Ling;LI Xiaochuang;ZU Yunqiu;HUANG Ming;SHI Xianzhang;LIU Chuntai(National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002,Henan,China;Luoyang Ship Material Research Institute,Luoyang 471023,Henan,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第4期2065-2075,共11页
CIESC Journal
基金
河南省科技攻关项目(182102210008)
江苏省重点研发计划(BE2019096)
宁波市重大专项(2019B10117)。
关键词
橡胶
硫化反应
数值模拟
动力学模型
耦合模拟
rubber
vulcanization reaction
numerical simulation
kinetic modeling
coupled simulation