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Method for preparing high-performance irradiation cross-linking ultrahigh polyethylene extrusion plate

A polyethylene, high-performance technology, applied in the field of preparation of high-performance radiation cross-linked melt-extruded sheets, can solve problems such as damage to inherent properties

Inactive Publication Date: 2013-04-24
SHANGHAI WEIXING NOVEL BUILDING MATERIAL
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  • Abstract
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  • Claims
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Problems solved by technology

It is characterized in that during the preparation of ultra-high polyethylene extruded sheets, a certain amount of nucleating agent is added to inhibit the penetration of oxygen into the polymer, and vacuum annealing is carried out to ensure that free radicals are fully cross-linked, so as to overcome the problems caused by the existing radiation cross-linking technology. UHMWPE degrades and destroys the shortcomings of inherent properties, and obtains cross-linked ultra-high polyethylene sheets with high gel content and excellent mechanical properties and heat resistance

Method used

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  • Method for preparing high-performance irradiation cross-linking ultrahigh polyethylene extrusion plate

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Embodiment 1

[0020] The radiation crosslinked ultra-high molecular weight polyethylene extruded sheet according to the present invention comprises the following steps: using ultra-high molecular weight polyethylene powder with a molecular weight of about 2.5 million as a raw material, and adding 1 wt% of nucleating agent 1,3 -2,4-Dibenzylidene sorbitol, 3wt% polyfunctional sensitizer trimethylolpropane trimethacrylate (TMPTMA), 3wt% polyethylene wax and 1wt% antioxidant 3,4,5-tri Propyl hydroxybenzoate (PG), after being fully mixed, is sent into the extruder, and after conveying, compacting and heating in sequence, it is extruded from the extruder. During the heating process, the temperature and pressure of the raw materials are controlled, and the thickness of the extruded sheet is 10mm. The obtained samples were exposed to air with 60 Co-γ-ray irradiation, the irradiation dose is 40kGy, and the dose rate is 2Gy / s. The irradiated samples were annealed in a vacuum oven at 120°C for 5 hou...

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Abstract

The invention relates to a method for preparing a high-performance irradiation cross-linking ultrahigh polyethylene extrusion plate. The method specifically comprises the following steps that: in the presence of a flow modifier, a sensitizer, a nucleating agent and antioxidant auxiliaries, an ultrahigh polyethylene plate is formed through melt extrusion, subjected to cross-linking reaction under high-performance X-ray irradiation and annealed in a vacuum drying oven so as to obtain the ultrahigh molecular weight polyethylene (UHMWPE) plate. The inherent performance stability of the polyethylene plate is ensured, and furthermore, the temperature resistance and mechanical properly of the polyethylene plate are improved.

Description

【Technical field】 [0001] The invention relates to the technical field of plates, in particular to a method for preparing high-performance radiation-crosslinked melt-extruded plates using ultra-high polyethylene as a raw material. 【Background technique】 [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic engineering plastic with a linear structure and excellent comprehensive properties. Compared with many polymer materials, because of its high molecular weight, it has excellent impact resistance, wear resistance, self-lubrication, chemical corrosion resistance, low temperature resistance and other properties that are unparalleled by other plastics. UHMWPE has excellent low temperature resistance, and still has high impact strength at -40°C, and can even be used at -269°C, but its high temperature resistance is not outstanding, which limits its application to a certain extent. In addition, because the molecular weight of UHMWPE is as high as several ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K5/00C08K5/053C08K5/13C08K5/09C08K5/092C08K5/103C08K5/3492C08J3/28C08J3/24
Inventor 应淑妮薛冠刘亮
Owner SHANGHAI WEIXING NOVEL BUILDING MATERIAL
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