HDPE Polyethylene Plastic Sheets 4X8

Performance Compared with other engineering plastics, UHMW-PE has the disadvantages of low surface hardness and low heat distortion temperature, poor bending strength and creep properties. This is due to the molecular structure and molecular aggregation morphology of ultra high molecular weight...

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Performance

Compared with other engineering plastics, UHMW-PE has the disadvantages of low surface hardness and low heat distortion temperature, poor bending strength and creep properties. This is due to the molecular structure and molecular aggregation morphology of ultra high molecular weight polyethylene (UHMW-PE), which can be improved by filling and crosslinking.

2 (2)

machining

Ultrahigh molecular weight polyethylene (UHMW-PE) resin has a long molecular chain and is susceptible to shearing by shearing or degradation by heat. Therefore, lower processing temperatures, shorter processing times and reduced shearing are necessary.

In order to solve the processing problem of ultra high molecular weight polyethylene (UHMW-PE), in addition to the special design of ordinary molding machinery, the resin formulation can be improved: blending with other resins or adding a flow modifier to enable Forming on ordinary extruders and injection molding machines, this is the lubrication extrusion (injection) described in 2.2.2.

Blending

Blending to improve the melt flow of ultra high molecular weight polyethylene (UHMW-PE) is the most effective, simple and practical way. This aspect of the technology is more common in the patent literature. The second component used for blending mainly refers to low melting point, low viscosity resin, LDPE, HDPE, PP, polyester, etc., among which medium molecular weight PE (molecular weight 400,000 to 600,000) and low molecular weight PE are used. (molecular weight <400,000). When the blend is heated above the melting point, the ultra high molecular weight polyethylene (UHMW-PE) resin is suspended in the liquid phase of the second component resin to form an extrudable, injectable suspension material.

(1) Blending with low and medium molecular weight PE

Ultrahigh molecular weight polyethylene (UHMW-PE) and low molecular weight LDPE (molecular weight 1,000 to 20,000, preferably 5,000 to 12,000) can significantly improve the formability of the process, but At the same time, the mechanical properties such as tensile strength and flexural elasticity are reduced. HDPE can also significantly improve the processing fluidity of ultra high molecular weight polyethylene (UHMW-PE), but it also causes a drop in impact strength and friction resistance. In order to maintain the mechanical properties of ultra high molecular weight polyethylene (UHMW-PE) blends at a high level, an effective compensation method is to add PE nucleating agents such as benzoic acid, benzoate, stearate. And adipate salt, etc., can enhance the crystallinity of PE and finely homogenize the size of the spherulites, thereby effectively preventing the decline of mechanical properties. It has been patented that a very small amount of fine nucleating agent wollastonite (having a particle size range of 5 nm to 50 nm and a surface area of 100 m2/g to 400 m2) is added to the ultrahigh molecular weight polyethylene (UHMW-PE)/HDPE blend system. /g), which can well compensate for the degradation of mechanical properties.


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