通用合成橡胶凝聚过程中粘性颗粒生成、粘结和运动机理及调控

由于缺少高粘剪切稀化非牛顿流体射流撞击破碎机理和易粘结大颗粒粘结机理的认识，导致橡胶胶液凝聚过程溶剂脱除困难、管路易堵塞和内构件挂胶严重，严重影响成品胶的质量和整个凝聚装置运行稳定性。为此，本项目首先直接数值模拟高粘剪切稀化非牛顿流体射流撞击破碎过程，研究射流撞击破碎模式、破碎长度和液滴大小等特征参数，揭示高粘剪切稀化非牛顿流体射流撞击破碎机理和调控机制。其次，采用侵入式远心照相测量仪，结合多相流体力学理论，在颗粒群尺度上研究易粘结大颗粒的粘结行为，揭示搅拌凝聚反应器内不同剪切环境下易粘结大颗粒的粘结机理。最后，结合欧拉-欧拉模型和粒数衡算方程，建立耦合易粘结大颗粒粘结机理的多相搅拌槽模型和计算方法，在反应器尺度上研究不同条件下的颗粒粘结行为和调控规律，并用稀土异戊橡胶验证实际凝聚效果。通过本项目研究，建立胶滴大小和胶粒粘结有效调控方法，为工业搅拌凝聚反应器的设计优化和放大奠定理论基础。

Due to the lack of the breakup mechanism of high viscosity shear thinning non-Newtonian impinging jets and bond mechanism of high viscous particles, there are still some problems in the coagulation process of industrial rubber, such as the difficulty in solvent removal, serious pipeline blockage and glue hanging, which seriously affect the quality of the final rubber and the operation stability of the whole coagulation device. In order to solve these problems, this project will firstly study the breakup process of high viscosity shear thinning non-Newtonian impinging jets by direct numerical simulation, and study the breaking mode, breaking length and droplet size etc., revealing the breakup mechanism and regulation mechanism of high viscosity shear thinning non-Newtonian fluid impinging jets. Secondly, using the invasive telecentric camera and the theory of multiphase hydrodynamics, the bond behavior of high viscous particles will be studied on the particle group scale, and the bond mechanism of large viscous particles under different shear environments in the stirred tank will be revealed. Finally, combining Eulerian-Eulerian model and population balance equation, the multiphase stirred tank reactor model and calculation method will be established to study the particle bonding behavior and regulation rule under different conditions on the scale of the reactor, and we will use rare earth isoprene rubber to verify the actual agglomeration effect. Through the study of this project, an effective control method of the size of the rubber drop and the adhesion of the rubber particles will be established, and a theoretical basis for the optimization and scale-up method of the industrial stirred coagulation reactor will be developed.