In the masterbatch,polyethylene wax is used as a dispersing agent for the pigment.How much is it suitable to add?Is the more the better?To answer this question,we tested the wax with two different structures.The pigment is selected from carbon black,and the coloring power of the masterbatch(reflected by the carbon black of the colored film)is used to characterize the dispersibility of the pigment.The test structure is shown in Figure 1.
The experimental structure shows the optimum dosage range.Under the experimental process,the best dispersion effect can be obtained when the amount of A wax is 15%and the B wax is 9%.The reason for this phenomenon is the two opposite effects of polyethylene wax on pigment dispersion.The addition of polyethylene wax to the masterbatch system improves the compatibility of the system with the pigment,enhances the wetting and penetration of the agglomerates,facilitates dispersion and reduces the viscosity of the system,although it can increase the yield,but also The shearing force transmitted to the pigment agglomerates is greatly reduced,which is disadvantageous for dispersion.The competition for these two opposite effects leads to the existence of an optimum range of usage.
When a small amount of polyethylene wax is added to the system,it is advantageous for the dispersion to be greater than the effect of hindering the dispersion,and at this time,a better dispersion effect is exhibited.With the increase in the amount of polyethylene wax,both effects are
Strengthening,when the concentration of the polyethylene wax exceeds a certain value,its adverse effect on dispersion accounts for the upper hand,and at this time,it appears as a download of the dispersion effect.Continue to increase the amount of polyethylene wax,the two roles relative to this
The effect of the dispersion is repeated.The optimum amount of different waxes in different systems is different,which is also related to equipment and process conditions.Therefore,the masterbatch manufacturer passes the actual production conditions.
After testing,find the optimal dosage range to get the best dispersion at the lowest cost.