尼龙6反应注射成型的数值模拟与工程分析  

Numerical Simulation and Engineering Analysis of Reaction Injection Molding Process of Nylon 6

作　　者：沈春银[1] 丁焰强 周云飞[1] 谢涵广 戴干策[1] Shen Chunyin;Ding Yanqiang;Zhou Yunfei;Xie Hanguang;Dai Gance(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《工程塑料应用》2018年第8期63-70,80,共9页Engineering Plastics Application

基　　金：国家自然科学基金项目(21376086)

摘　　要：采用Matlab软件对三维薄层模腔内尼龙6的反应注射成型进行了数值模拟。考察了反应速率常数(K_0)、物料入模注射温度(T_0)和模腔壁面温度(T_w)对反应加工体系的温度、单体转化率与产物结晶度的影响,并对工程特征时间进行了分析。结果表明,随着K_0的增大,体系的温升幅度增大,随着温度的升高,完全聚合所需时间缩短,体系开始结晶的时间提前,而完成结晶所需时间差别不大。随着T_w的升高,体系的温升幅度增大,聚合加快,单体完全转化所需时间显著缩短,结晶完全所需时间延长;但T_w<150℃时,提高T_w会使结晶开始时间提前,而T_w> 150℃后则延迟。T_0对体系温升幅度、单体转化和结晶行为的影响不大。工程分析表明,单体转化与聚合物结晶适宜匹配的K_0的范围为90×10~4～110×10~4s^(-1),T_w的范围为145～155℃,从能耗角度考虑,T_0应尽可能地低。The MATLAB software was employed to analyze the reaction injection molding of nylon 6 system in the threedimension thin mold cavity.The influences of reaction rate constant(K0),injection temperature(T0)and cavity wall temperature(Tw)on distribution of temperature,conversion and crystallinity of the system were investigated and the engineering characteristic time were analyzed.It is reveal that the increasing K0 causes the bigger elevation of reaction temperature,cut down the required time of complete polymerization,moves up the beginning of crystallization with little different of total time.The increasing of Tw also causes the larger promotion of reaction temperature with notable shortening time for monomer complete conversion and lengthening time for the complete crystallization.The beginning of crystallization is earlier if Tw<150℃otherwise deferred.T0 has little effect on the promotion of temperature,conversion of monomer and crystallization behavior.The optimum conditions are proposed in the range of 90×10^4–110×10^4 s^-1 for K0 and 145–155℃for Tw,with the lower T0 for the energy consuming.

关 键 词：数值模拟 有限差分法 尼龙 反应注射成型 工程分析 

分 类 号：TB332[一般工业技术—材料科学与工程]