Antioxidant, UV Absorber, Optical Brightener And Pigment For Polypropylene
PP is an abbreviation of polypropylene is a thermoplastic polymer used in a wide variety of applications including packaging and labeling, textiles, etc.
PP Processing temperature of PP is 200-300℃.
Antioxidant, UV Absorber and Light Stabilizer For PP
|Processing Temperature||Antioxidant||UV Absorber|
|PP thick section||260-280℃|
|PP thin section|
Fiber & strip
770 without heat
622 with heat
Optical Brightener For PP of Polyolefin
|Application||OBAs Adding Form||Typical OBAs||Issue to mind|
|Polyolefin||Dry powder mix||FP 127||Compatibility|
Pigment for PP (please click on title)
Things to know when selecting pigments for polyolefins
1. Distortion & Shrinkage
A number of organic pigments cause distortion in certain types of polyolefins, especially in HDPE. These pigments also enhance the shrinkage of polyolefins, particularly in the direction of the flow.
The dispersibility of an organic pigment which is to be incorporated in a polyolefin is of particular importance. This is especially true for the coloration of extrusion films and for HDPE or PP ribbon made from stretched blown film or from sheeted extrusion film, as well as for the coating or melt spin dyeing. Powder form pigment dispersion is not adequate in these applications. Poor dispersion causes filler specks, holes in films, and other faults. Pigment preparations, usually in combination with polyolefins as a carrier, are frequently used to color polyolefins.
Pigment powders continue to be used in thick-walled articles, such as extruded sheets, or hollow objects, or in injection-molded products; although color concentrates are beginning to be more important even in these areas.
Pigment/polyolefin paste preparations containing between 20 and 70% pigment are also used. They are manufactured by means of three-roll mills, agitated ball mills, or dissolves or similar equipment. Such preparations are employed primarily to produce bottles, injection-molded articles, or extrusion sheets. These preparations have the advantage of being applicable in volumetric doses and may be premixed in slow mixers or gravitation mixers to uniformly adhere to the plastic granulate.