From Processing Aids to the Rainbow Effect
Not only Color, Function, too
Besides an extensive portfolio of color masterbatches, the Grafe Group, Blankenhain, Germany, is also taking some new technical developments to the K show. For example, an additive masterbatch for polyolefins was developed that is intended to improve flow properties and speed up crystallization during cooling. The processing aid is used in an amount of 2 to 4 % in injection molding. According to the manufacturer, it reduces the process temperature and permits shorter cooling times. The additive batch is also said to be usable on all conventional machines and be suitable for other processing techniques, such as extrusion and blow molding.
At the same time, an additive is offered that improves the melt flow during the processing of polyamide. It is claimed to improve the part surface, reduce the cycle time and have a positive effect on the mechanical properties. The additive batch that is fed in a proportion of 3 to 4 %, is also claimed to optimize the embedding of fibers in polyamide, according to the manufacturer.
A halogen-free flame-retardant PP compound with no restrictions on pigmentation is also presented. It meets flame-resistance class UL94-V0 for wall thicknesses of 1.6 mm with good mechanical properties. Because of its flow properties, the material is suitable for manufacturing thin-walled parts.
The program also includes an electrically conductive, halogen-free flame-retardant PP compound. This material, based on conductive carbon black is black and cannot be pigmented in any other color. The volume resistivity and surface resistivity can be adjusted according to the application. Thus, according to the manufacturer, the product can also be offered with resistance values of <100 ohm if required by customers. The conductive material meets flame resistance class UL94-V0 for wall thicknesses of 1.6 mm.
Another innovation is a matting agent that allows different surface effects to be represented in the mold. This additive is added directly in the part manufacturing process (injection molding and extrusion). The matting agent is embedded in the plastic melt and generates a diffuse light refraction or scattering even on polished mold surfaces. It also permits a certain degree of improvement in scratch resistance.
Not least, a pigment development should also not be forgotten. The holographic effect pigment MultiFlect, which shimmers in rainbow colors, was developed in collaboration with Schlenk Metallic Pigments GmbH, Roth, Germany. The effect is the result of an angle-dependent polychromaticism. Depending on the application and angle of light incidence, the pigment generates a three-dimensional pearlescent color effect, through rainbow colors, to an illusion of depth. It is sufficient to use 2 to 3 % of the corresponding pigment in the target polymer. According to the masterbatch manufacturer, it has not been possible in the past to incorporate attractive hologram effects in thermoplastics with relatively high processing temperatures. The effect is used for the first time in a multitier cake stand from Koziol GmbH.
Grafe Advanced Polymers GmbH
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