Study on Rheological Properties of Titanium Dioxide Coloring System Treated by Mechanical Activation

Treatment affect mechanical activation titanium white powder would join plastic rheological properties of the plastic. In plastic processing, rheological properties are an important indicator for evaluating the processing properties of materials. If the rheological property is good, the processing is easy; on the contrary, the processing is difficult. The rheological properties of titanium dioxide treated by mechanical activation have become an important factor affecting its application.
We used dynamic torque rheology to evaluate the processability of mechanically activated iron powder treatment. Three grades of titanium dioxide were selected and treated with mechanical activation to treat titanium dioxide, which was mixed with PE pellets and added to the Brabender plasticizer for rheological testing. The data is shown in the table.

It can be seen that the plastication time of the whitening powder treated by the mechanical activation method is not much different from that of the untreated white powder. Plasticizing time refers to the time required for the material to be added to complete plasticization, which is determined by temperature, pressure and shear friction. The white powder uniformly covering the surface of the core material has similar surface properties, thermal conductivity and friction coefficient as the untreated white powder. When the amount of addition is the same, the heat transfer and shear friction of the plastic are basically the same. Therefore, there is no significant difference in plasticization time.
At the same time, we can also see that the equilibrium torque of the titanium dioxide treated by the mechanical activation method has increased. Since the particles of the mechanically activated titanium dioxide are larger than the untreated titanium dioxide, the frictional resistance between the titanium dioxide particles and the resin matrix is ​​increased, resulting in an increase in melt viscosity and a decrease in processability, which is manifested by an increase in balance torque.

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