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With China Plastic Machinery
With China Plastic Machinery
Ultra-high molecular weight polyethylene anti-wear blocks have been widely used in many fields due to their unique processing and use characteristics.
Ultra-high molecular weight polyethylene (UHMW-PE) plastics have the advantages of many engineering plastics, including excellent impact resistance, wear resistance, low temperature performance, self-lubrication and non-stickiness, making it a thermoplastic engineering plastic with excellent comprehensive performance. Its products are suitable for scenes such as impact resistance, vibration reduction, bulletproof, fatigue resistance, wear resistance, friction reduction, drag reduction, and anti-sticking in many fields such as daily life, industry, sports culture, transportation, national defense, and machinery. However, UHMW-PE also has some disadvantages, such as poor melt fluidity, difficulty in molding, insufficient heat resistance, and stress cracking. Therefore, the study of its performance, modification, processing technology and equipment has become a research hotspot in China and abroad in recent years.
At present, the main equipment used for extrusion molding of ultra-high molecular weight polyethylene (UHMW-PE) in China and abroad are plunger extruders and single-screw extruders. Phillips' horizontal plunger extruder is equipped with a reciprocating hydraulic cylinder system, which can reduce the shear force and friction of the material, and quickly retract the mold core to achieve synchronous movement with the material, which is suitable for the production of thin-walled pipes. The UHMW-PE series of special single-screw extruders developed by China have successfully achieved continuous and stable extrusion of UHMW-PE by grooving the inner wall of the barrel and matching with a special screw. It can be used to produce round rods, sheets, wire strips, pipes and other products, and has become one of the typical UHMW-PE special extruders in the world. The North China Institute proposed the "plug conveying" theory, using a single-screw extruder to extrude and granulate UHMW-PE. The granules can be injection molded by ordinary injection molding machines, and the product quality is stable and reliable.
In order to overcome the limitations of UHMW-PE itself, improve its processing performance and expand its application range through modification, the current research on the processing modification of UHMW-PE mainly includes the following directions:
UHMW-PE can be blended with PE of different relative molecular weights and processed by ordinary single-screw extruder. When the relative molecular mass of PE is high, the performance of the blend will retain more characteristics of UHMW-PE; when the relative molecular mass of PE is low, the performance of UHMW-PE may be lost.
Adding an appropriate amount of lubricant can improve the processing performance of UHMW-PE, but too much addition will affect its original performance. The MS2 lubricant developed by Beijing University of Chemical Technology can significantly improve the fluidity of UHMW-PE by adding a small amount to it. The composite lubricant composed of copolymer and stearate produced by Allicd-Signal Company in the United States can be processed on ordinary single-screw extruders and injection molding machines after being blended with UHMW-PE.
Tsinghua University uses in-situ compounding technology to add appropriate liquid crystal polymer (LCP) and additives to UHMW-PE. After mixing evenly, it can be granulated with a general single-screw extruder.
By filling different fillers, such as fillers treated with silane, the hardness, flame retardancy, heat resistance, wear resistance, and friction coefficient of UHMW-PE can be improved. In addition, intercalation technology and grafting modification technology can also be used to enhance the various properties of UHMW-PE.
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