The application of wax in pigment processing, the addition of polyolefin wax to the pigment system improves the compatibility between the system and the pigment, strengthens the wetting and penetration of aggregates, and facilitates dispersion; On the other hand, reducing the viscosity of the system can increase the output, but it also greatly reduces the shear force transmitted to the pigment aggregates, which is not conducive to dispersion.
Application of wax in color processing:
The processing and production of pigment pellets firstly need to disperse the pigment aggregates into primary particles or crystals under the action of shear force to achieve a relatively uniform primary state. After use, re-agglomeration will also occur. The wax can effectively wet and penetrate into the pores of the aggregated particles to cover the surface of the pigment. Under the action of shear force, the pigment aggregates can be better dispersed to effectively prevent re-agglomeration.
According to the principle of pigment processing, although the wetting and penetrating coating effect of wax is better, the low viscosity of Fischer-Tropsch wax reduces the shear force of aggregates, making the pigment dispersion effect poor. On the contrary, due to the higher molecular weight and the existence of branched chain structure, polyvinyl wax has higher viscosity and is more suitable for color grain processing.
Polyethylene waxes(PE Wax) are low molecular weight polyethylene homopolymers or copolymers widely used in coatings. The so-called wax means that the polymer is floating in the form of microcrystals and plays a role similar to stone wax but more diverse and practical than stone wax in the coating surface. Polyolefin wax is used as a dispersant in colorant processing and is widely used in polyolefin colorants. It has good compatibility with polyvinyl chloride, polyvinyl chloride, polypropylene and other resins, and has excellent external lubrication and internal lubrication.
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