Optimization Design Of Structure Of The Force Chemical Reactor Based On CAE And Simulation Of Polymer Blending Compatibility

With the continuous development of modern science and technology,people also constantly improve the requirement on the properties of polymer materials.A single performance of plastic products can not meet the needs of people’s daily production and life.So the polymer alloy material has been developed.The polymer is prepared by blending or grafting to produce a polymer product with excellent properties.The compatibility of most polymers with other polymers and inorganic materials is not so good when blending.This appearance limiting the production of polymer alloys.In this paper,based on polyethylene as an example.In order to improve the compatibility of polyethylene with other polymers and inorganic materials,to broaden the scope of application of polyethylene,usually we graft the polar groups（Such as MAH）on the polyethylene.This will make up for the poor compatibility of polyethylene with other materials.At present,the main method of grafting maleic anhydride is to add oxidant（such as DCP）.Then the polar groups are grafted on non-polar polyethylene chains using solution or mechanical melting to improve their compatibility with other polymers.The chemical reaction grafting method has been attracted wide attention since its many advantages,such as high grafting rate,don’t need the initiator,don’t introduce impurities and so on.In order to obtain the excellent shear and mixing effect on the material,the screw and barrel structure of the single-screw strong shear force chemical reaction device are optimized.We use Polyflow software to do numerical simulation.The depth of barrel groove,the gaps between barrel and screw,screw height and width and the number of screws as a variable,respectively.According to the results of Polyflow simulation,the optimal structure of the screw and the barrel of the strong chemical reactor was selected by the data analysis of the average residence time,the accumulated residence time,the maximum shear rate,the maximum shear stress and the maximum mixing index.The conclusion is that the depth of the barrel groove is 1mm,the gaps between the barrel and the screw is 0.5mm,the height and width of the screw are 3mm,and the number of screw heads is 10.We installed one of the best screw and screw arris structure in the single-screw strong shear force chemical reaction device.In order to verify the blending effect of the device,we first used the apparatus for inorganic polymer modified polymers to prepare inorganic composites.We have HDPE and talc powder and nano-CaCO₃ inorganic materials melt blending to prepare polymer composite materials.And compared with the mechanical properties of the polymer composite materials prepared using a twin screw extruder.It can be found that the blending effect of the screw and the barrel structure on the material is even beyond the twin screw extrude in actual production.In order to study the effect of blending,we first predict the compatibility problems that may occur when polymer blends by means of computer simulation and provide the basis for theoretical analysis of subsequent experimental results.In this paper,we research the Flory-Huggins parameters,glass transition temperature,the distribution function and the mean square end distance in the MD simulation and the equal density map and the end distance of the polymer in the DPD simulation of the pure PS,PE and PS/PE blends of different composition by using Materials Studio（MS）7.0 software,respectively.We can conclude that when the PS/PE blend ratio is 70/30,50/50,30/70 and 10/90,the compatibility is not good;and when the PS/PE blend ratio is 90/10,the compatibility is improved compared to the blends at other ratios.In order to determine whether PE-g-MAH improved its compatibility with other polymers,we also used computer simulation to predict subsequent polymer blending experiments.First,we assume that the PE-g-MAH is obtained by chemical reaction of polyethylene,then we also research the solubility parameter,glass transition temperature,the distribution function and the mean square end distance in the MD simulation and the equal density map and the end distance of the polymer in the DPD simulation of the pure PS,PE-g-MAH、PS/PE-g-MAH and PS/PE/PE-g-MAH blends of different composition by using Materials Studio（MS）7.0 software,respectively.We can conclude that when the PS/PE-g-MAH blend ratio is 70/30,50/50,30/70 and 10/90,the compatibility is well than that of the PS/PE blends.When PE-g-MAH is added as a compatibilizer to the PS/PE blends,the compatibility of the PS/PE blends is improved.