How To Identify The Authenticity Of UHMW Polyethylene?
UHMW Polyethylene is a kind of polymer compounds, it is difficult to process, and has a strong wear resistance, self-lubricating, high strength, chemical stability, anti-aging performance, so in the identification of true and false polymer poly Ethylene, we must pay attention to these characteristics, the specific identification method is as follows:
1. Weighing rule: the real UHMW Polyethylene products in the proportion of 0.93-0.95 between the smaller density, can float on the water. If not pure polyethylene material, will sink into the water.
2. Temperature measurement: pure UHMW Polyethylene products, at 200 degrees Celsius is not melted, will not be deformed, but will become soft. If it is not pure polyethylene material at 200 degrees Celsius will be deformed.
3. Visual method: the real UHMW Polyethylene surface smooth, uniform, smooth, black shiny and cut density is very uniform, if not pure polyethylene material color is dim and uneven density.
4. Edge test room: pure UHMW Polyethylene flanging end rounded, uniform, smooth, if not pure polyethylene material flanging end of the crack, and in the turn after the turn will appear dregs phenomenon.
Compared with other engineering plastics, UHMW Polyethylene (UHMW-PE) with surface hardness and heat distortion temperature is low, bending strength and creep performance and other shortcomings. This is due to the molecular structure and molecular aggregation of UHMW Polyethylene (UHMW-PE), which can be improved by filling and crosslinking.
UHMW Polyethylene (UHMW-PE) resin molecular chain longer, vulnerable to shear stress fracture, or heat degradation. Therefore, the lower processing temperature, shorter processing time and reduce the shear of it is very necessary.
In order to solve the problem of UHMW Polyethylene (UHMW-PE) processing, in addition to the special design of ordinary molding machinery, but also to improve the resin formulations: blending with other resins or adding flow modifier, so that General extruder and injection molding machine on the molding process, which is described in 2.2.2 lubrication extrusion (injection).