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Study on Quality of Mixing Rubber in Two Types of Rotor Mixer

Author: LiuLinTao
Tutor: ChenKeJuan
School: South China University of Technology
Course: Mechanical Design and Theory
Keywords: Mixer Rotor Three-dimensional flow field Rubber mixing
CLC: TQ330.6
Type: Master's thesis
Year: 2011
Downloads: 35
Quote: 0
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Abstract

Rubber in order to highlight the advantages unmatched by many other polymer materials by the attention and is widely used, mixing rubber processing technology is the most basic and most important process. Currently, in the rubber mixing process plays an important role in the mixer, with the vigorous development of the rubber industry, for mixer performance requirements increasingly high. Rubber mixing process is very complex, and the establishment of mathematical models and analytical calculations become very difficult, it has become possible with the development of computer technology, the numerical simulation of the rubber mixing process. Rubber mixing process flow field changes, two types of rotor mixer mixing process, the three-dimensional flow field simulation study to explore the mixing mechanism of the mixer, the process conditions in order to more clearly grasp the mixing chamber optimization and structural improvements to provide a reference. Firstly, the use of of POLYFLOW finite element analysis software, the two types of rotor three-dimensional numerical simulation of the flow field of rubber mixing, and mixing model field quantities were analyzed. Pressure field analysis showed that the two types of rotor and chamber intramural pressure distribution changes are as follows: to the side of the mixing zone between the rotor face and two rotor, the pressure from the top of the rotor edges and cut edges of the shear plane descending order . In contrast, the the Banbury rotor's ability to build pressure better than 4WH rotor. The velocity field analysis showed that the speed in the mating area: 4WH rotor flow field flow better than Banbury type rotors, is conducive to the mixing and distribution of plastic material. Viscosity course and shear rate analysis showed that: the crests of the ribs of the rotor there is a higher shear rate, so that the plastic material to produce shear thinning behavior, the viscosity becomes smaller; rotor non-face glue mix tumbling region, shear rate small, and high viscosity values. The hybrid index field analysis showed that the the: two configurations asynchronous rotor hybrid index area is always between the two rotor. In this paper, the laborers Baichuan 1 l Banbury experimental mixer for rubber mixing experiments and rubber samples Mooney viscosity test, test of carbon black dispersion test and the physical and mechanical properties. Analyzed the influence of the two factors of the fill factor, the rotor speed of the mixing process of the two formulations, the experimental results show that the maximum power consumption by the rubber kneading with the speed and the filling factor increases, the speed variation of the rotor of the power larger; With the mixer speed increased and the fill factor is increased, the Mooney viscosity average decline. Average carbon black dispersion of the plastic material samples and most of the mechanical properties with the rotor speed and the changes of the fill factor appears preferred value, the machine of the present experiment, the rotor speed at 40 to 50r/min filling factor of 0.7 to 0.75, , mix higher mechanical properties, the degree of dispersion of the carbon black is better. Visible, choose the rotor speed and fill factor the optimized mixing plays an important role. In order to verify the feasibility of the simulation results, the paper combined mixing the experiment proceeds viscosity value and the row of plastic power, respectively, for the comparative analysis of finite element simulation of viscosity and pressure fields. The experimental viscosity analog viscosity contrast, the introduction of proportional coefficient K to characterize the two types of rotor experimental viscosity with analog viscosity. The calculated K experiment with K simulation error in the two formulations were less than 5%. Experiment dump power analog pressure contrast, the introduction of proportional coefficient L characterization of two types of rotor impact on the debinding power and analog pressure. The calculated L experiments with L-simulation error in the two formulations were less than 7%. Visible, established the rubber mixing finite element model is feasible to some extent by comparing simulation results with experimental results.

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CLC: > Industrial Technology > Chemical Industry > Rubber Industry > General issues > Products forming process
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