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Ultra High Molecular Weight Polyethylene Anti-wear Block

Jul 17, 2019

Ultra high molecular weight polyethylene anti-wear blocks have been widely used for their unique processing and use properties.

High molecular weight polyethylene (UHMW-PE) plastics have been widely used for their unique processing and use properties. This is mainly because it is almost set

All the advantages of other engineering plastics, including excellent impact resistance, wear resistance, low temperature performance, self-lubricating and non-sticking, etc.

Outstanding, it is a thermoplastic engineering plastic with excellent comprehensive performance. Its products are used in daily use, industry, culture, transportation, national defense, and machine

Anti-shock, vibration-damping, bullet-proof, anti-fatigue, wear-resistant, anti-wear, drag reduction, anti-sticking and other occasions in the field of machinery and other fields. Ultra high molecular weight polyethylene

(UHMW-PE) also has many disadvantages such as poor melt flowability, difficulty in molding processing, poor heat resistance, and stress cracking. Therefore,

Research on its performance, modification research, processing technology and equipment has become the focus of research at home and abroad in recent years.

Process improvement and broadening application areas


Domestic and foreign production equipment for extrusion molding ultra high molecular weight polyethylene (UHMW-PE) mainly uses plunger extruder and single screw

The extruder is mainly used. Phillips has a reciprocating hydraulic cylinder system on the horizontal ram extruder that allows the core to be filled with the material

Float forward together, thereby reducing the shearing force and friction force of the reciprocating extrusion piston repeatedly acting on the material, and the core is periodically fast

Quick retraction, repeating its specific forward movement with the material, the device can be used to produce thin-walled tubing. Ultra high molecular weight polyethylene developed in China

(UHMW-PE) series of special single-screw extruder, its main feature is to slot the inner wall of the barrel to solve the problem of the plug, and then with a special screw,

Achieve continuous and stable extrusion of ultra high molecular weight polyethylene (UHMW-PE) for the average relative molecular mass of 1.5 million to 3 million

Processing of high molecular weight polyethylene (UHMW-PE) products, which can be extruded into round bars, sheets, wires, pipes, etc., has become a super high at home and abroad.

A typical representative of a special extruder for molecular weight polyethylene (UHMW-PE). North China Institute based on ultra high molecular weight polyethylene (UHMW-PE)

In the wide temperature range, it is characterized by high-elastic body, and the mechanism of “gel transfer” is proposed, that is, the material in the screw groove of the screw feeding section is pressed.

The shrinking rubber plug, instead of the compacted solid plug, solves the problem that the friction coefficient between the solid plug and the barrel is small and the solid transport is difficult.

Ultrahigh molecular weight polyethylene (UHMW-PE) was extruded and granulated by a common single screw extruder, and the pellets were injection molded by a common injection molding machine.

Its product quality is stable and reliable.


Sintering of ultra high molecular weight polyethylene (UHMW-PE) is followed by a polytetrafluoroethylene sintering molding method, but in the sintering process

The shrinkage deformation is large, and the method can only process parts having a simple shape and requiring post-processing. In the compression mold for ultra high molecular weight polyethylene (UHMW-PE)

In the plastics research, a peroxide and silane crosslinked ultra high molecular weight polyethylene (UHMW-PE) can be used to thermally release the compression molded article.

The molding cycle is significantly shortened. Due to the poor melt flow, low strength and unstable shrinkage of ultra high molecular weight polyethylene (UHMW-PE),

The process conditions are extremely strict during hot deformation processing, and the ultra high molecular weight polyethylene (UHMW-PE) has a very high melt viscosity and is blown in the hollow.

Plastic process tube blanks are not easy to sag and are therefore suitable for blowing large containers. Companies in the Netherlands, the United States, and China's China Textile Corporation produce ultra-high polymers.

Polyethylene (UHMW-PE) fiber and non-woven fabric, but the disadvantage is that the heat resistance is poor, and needs to be researched and improved. In addition, ultra high molecular weight polyethylene

(UHMW-PE) can also be used to prepare low-foam products, hollow fiber separation membranes, wear-resistant anti-stick coatings, etc., using various processes like PE.


Research on raw material modification to improve processing performance


Aiming at the inherent disadvantages of ultra high molecular weight polyethylene (UHMW-PE), its processing properties are improved by modification, and its application field

Will be further broadened. The research on the processing modification of ultra high molecular weight polyethylene (UHMW-PE) mainly has the following aspects.


—— Blending modified ultra-high molecular weight polyethylene (UHMW-PE) and PE under certain conditions can be processed by ordinary single-screw extruder.

High relative molecular mass of PE and ultra high molecular weight polyethylene (UHMW-PE) due to similar viscosity, blending is intermolecular dispersion, ultra-high molecular weight

The performance of polyethylene (UHMW-PE) is kept high; the relative molecular mass of PE is blended with ultra-high molecular weight polyethylene (UHMW-PE).

Easy, the dispersion is basically an island structure, ultra-high molecular weight polyethylene (UHMW-PE) is a dispersed phase; low relative molecular mass of PE is

Ultrahigh molecular weight polyethylene (UHMW-PE) blended with a large amount of addition, ultra high molecular weight polyethylene (UHMW-PE) performance loss,

This method is of little practical value.


Polyimide resin has good heat resistance, excellent adhesion, no reduction in strength at high temperature, wear resistance, etc.

After mixing ethylene (UHMW-PE), it can be processed by a common extruder. Japanese patent introduction, the average relative molecular mass is more than 1 million

Ultrahigh molecular weight polyethylene (UHMW-PE) is modified by adding 0.4% to 10% polyimide resin and extruded on a common single screw extruder.

The round bar material has no significant difference in physical and mechanical properties from the products formed by the die-casting process. In addition to polypropylene,

Polyamides, elastomers and rubbers can also be blended with ultra high molecular weight polyethylene (UHMW-PE).


——Lubricant modification Adding a lubricant to ultra high molecular weight polyethylene (UHMW-PE) can improve its processing performance, but the amount added is not

Can be too much, otherwise the performance of ultra high molecular weight polyethylene (UHMW-PE) will be greatly reduced. MS2 lubricant prepared by Beijing University of Chemical Technology,

Simply adding 0.6% to 0.8% of ultrahigh molecular weight polyethylene (UHMW-PE) can significantly improve its fluidity and lower its melting point by 10 °C.

A copolymer produced by Allicd-Signal of the United States is combined with stearate as ultrahigh molecular weight polyethylene (UHMW-PE)

Lubricant with good effect, this compound lubricant can be blended with ultra high molecular weight polyethylene (UHMW-PE) in ordinary single screw extruder

And processing on the injection molding machine.


——In-situ composite of liquid crystal polymer Tsinghua University uses in-situ composite technology to add ultra-high molecular weight polyethylene (UHMW-PE)

A suitable liquid crystal polymer (LCP) and a specific auxiliary agent are mixed uniformly, and then granulated by a general-purpose single-screw extruder.


——Other modification uses different fillers to fill and modify ultra-high molecular weight polyethylene (UHMW-PE) to improve hardness.

Improve flame retardancy, improve heat resistance, reduce shrinkage and wear resistance, reduce friction factor, and reduce cost. Filler is generally silicon

Alkane treatment, the amount should not exceed 20%. In addition, the use of intercalation method to modify ultra-high molecular weight polyethylene with layered inorganic nanomaterials

(UHMW-PE), can achieve a variety of modification effects such as enhancement. Ultrahigh molecular weight polyethylene (UHMW-PE) can also be graft modified.

Such as solid phase grafting, solution grafting, suspension grafting, etc., to solve the problem of interface compatibility.