What is the role of polyvinyl wax in color grains? Polyethylene wax plays a role of lubricating and dispersing in the pigment particle system, increasing the compatibility with resins such as polyvinyl, polyvinyl chloride, polypropylene and other resins.
When added to the color particle system, it can increase the extrudability of color particles, improve production efficiency, and at the same time increase the gloss and processing performance of the product. Pigment particles are pigment concentrates with resin as the carrier. Pigments exist in three states: primary particles, aggregates and aggregates. The dispersion mechanism of pigments is to break aggregate particles into aggregates and primary particles. And the process of stabilizing the generated particles.
The resin melt has high viscosity and poor compatibility with the pigment surface, so it has poor wettability and is difficult to penetrate into the pores of the aggregate, so it cannot transmit shear force better and it is difficult to break the aggregate well. Even after the aggregates are broken, the resin melt cannot quickly wet and protect the surface, and the collision and contact with each other will make the particles reassemble. In order to solve this problem, an appropriate amount of polyvinyl wax can be added to the above system.
Application advantages of polyethylene wax(PE Wax) in color masterbatch:
(1) Polyethylene wax with higher thermal stability has better thermal stability, because if the wax material is gasified, it will have a bad influence on the color grains and products, and there are some arbitrary substances, For example, after the thermal weight loss test of stone wax at 200°C, the stone wax will lose 10% of its weight within 4 minutes, and the weight loss will reach more than 20% in 10 minutes, so some cheap polyolefins will lose weight. Adding some low-molecular-weight substances such as stone wax will have a certain impact on the quality of the toner grains and post-processing products.
(2) Appropriate molecular weight Through the dispersibility test of polyvinyl waxes with different molecular weights, the wax’s ability to separate pigments gradually increases with the increase of molecular weight. For the colorant production process, the molecular weight should be selected Polyethylene wax at 3000 is more suitable.
(3) Narrow molecular weight distribution Molecular weight distribution has a certain influence on the dispersibility of polyolefin waxes. Waxes with narrow molecular weight distribution have better dispersibility than those with wide molecular weight distribution.
Polyethylene wax(PE Wax) has good compatibility with toner, it is easy to wet the pigment, and can penetrate into the internal pores of the pigment aggregate, weakening the cohesion, making the pigment aggregate more easily broken under the action of external shear force, The newly generated particles can also be quickly wetted and protected, so they can be used as a dispersant for various thermoplastic resin color particles, a lubricating dispersant for filler materials, and degradable materials. In addition, polyvinyl wax can also reduce the viscosity of the system and improve fluidity, because polyvinyl wax is added during the production of pigment particles, which can improve production efficiency and output, and stabilize the dispersion effect.
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