What is the role of synthetic waxes in pigments?

2021-05-19   Pageview:870

To achieve better production, various chemical components are often added to optimize conditions. Polyethylene wax, also known as polymer synthetic wax. White powder, granules or flakes, translucent, density 0.9g/cm3. softening point 100~110℃. Viscosity (140℃) 550mPa-S. Although the softening point is high, the melt viscosity is low, good dispersion and fluidity, good compatibility with polyolefin.

1. For pigment or dye. Pigments are subdivided into organic pigments and inorganic pigments of polyethylene wax Commonly used organic pigments are: phthalocyanine red, phthalocyanine blue, phthalocyanine green, sun-resistant big red, macromolecular red, macromolecular yellow, permanent yellow, permanent purple, azo red, etc .

Normal inorganic pigments are: cadmium red, cadmium yellow, titanium dioxide, carbon black, iron oxide red, iron oxide yellow, etc.

2. Synthetic wax as a carrier is the matrix of masterbatches. Special masterbatches generally choose the same resin as the product resin as the carrier, and the compatibility between the two is best. However, the fluidity of the carrier should be considered at the same time.

3. Dispersant. The dispersant should have a lower melting point than the resin, good compatibility with the resin and good affinity with the pigment. Commonly used dispersants are: polyethylene low molecular wax, stearate.

4. Additives. Flame retardant, brightening, antibacterial, antistatic, antioxidant and other varieties, unless the customer requests, generally the color masterbatch does not contain the above additives.

High density polyethylene wax play the effect of external smoothness in the process after increasing, and then weaken the shearing effect of machinery and melt, so that the refinement of pigment particles in the melt and the dispersion effect will be greatly reduced, resulting in uneven distribution of pigment in the product, and the coloring power of pigment will be reduced and the coloring quality will be affected.


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