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Method of raising ultra high molecular weight polyethylene processing fluidity using radiation technology

A technology with ultra-high molecular weight and processing fluidity, which is applied in the field of polymer processing, can solve problems such as complex formulations, and achieve the effects of simple process, low cost and excellent comprehensive performance

Inactive Publication Date: 2006-05-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the content disclosed in this patent that the formulation of the composition is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] 1. In the air at room temperature, use a JJ-2 electrostatic accelerator to irradiate ultra-high molecular weight polyethylene, the irradiation dose is 80kGy, and the irradiation time is 13.3 minutes. Add 10kg of irradiated ultra-high molecular weight polyethylene and 0.5kg of mica into a high-speed mixer and mix evenly, then extrude and granulate with a twin-screw extruder. The head temperature is 230°C, and the ultra-high molecular weight ethylene material with improved processing fluidity is obtained.

[0017] 2. In air at room temperature, using cylindrical Co 60 The gamma ray source irradiates ultra-high molecular weight polyethylene, the irradiation dose is 50kGy, and the irradiation time is 50 hours, then add 10kg of irradiated ultra-high molecular weight polyethylene and 0.15kg of talc into a high-speed mixer and mix evenly, and then use a double The screw extruder is extruded and granulated, the temperature of each stage is 220°C, 240°C, 240°C, 240°C, and the t...

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Abstract

The invention discloses a method for improving the processing fluidity of ultra-high molecular weight polyethylene by adopting irradiation technology. Irradiate ultra-high molecular weight polyethylene in the air at room temperature, the irradiation dose is 10-100KGY, and the irradiation time is 10 minutes-100 hours, so that the chain scission reaction of ultra-high molecular weight polyethylene occurs, the molecular weight is reduced, and the molecular chain is entangled. The knot is weakened, and oxygen-containing polar groups are introduced into the molecular chain. Add 100 parts by weight of irradiated ultra-high molecular weight polyethylene and 1-10 parts by weight of inorganic filler into a high-speed mixer and mix evenly, then extrude with a twin-screw. Machine extrusion, extruding and granulating at a temperature of 220-250°C to obtain ultra-high molecular weight polyethylene materials with improved processing fluidity.

Description

1. Technical field [0001] The invention relates to a method for improving the processing fluidity of ultra-high molecular weight polyethylene by using irradiation technology, and belongs to the field of polymer processing. 2. Background technology [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic engineering plastic with excellent comprehensive properties. It has impact resistance, wear resistance, stress crack resistance and self-lubricating properties unmatched by other engineering plastics, and has a wide range of uses. The molecular structure of ultra-high molecular weight polyethylene is similar to that of high-density polyethylene (HDPE), but the molecular chain is very long, the viscosity-average molecular weight is generally above 1.5 million, and the weight-average molecular weight is more than 3 million. Due to the long molecular chain, UHMWPE is very prone to chain entanglement, and the melt viscosity is as high as 10 8 Pa.s, the flow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/28C08L23/06C08K3/40
Inventor 刘鹏波范萍徐闻罗利琴
Owner SICHUAN UNIV