Polyethylene film and preparation method thereof
A polyethylene film, polyethylene technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of low production efficiency, poor optical properties and mechanical properties of polyethylene films, etc. The effect of improving production efficiency, reducing friction coefficient, and excellent slippery performance
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[0017] The preparation method of the polyethylene film provided by the present invention includes mixing polyethylene and self-lubricating particles uniformly and then sending them into an extruder for melting, kneading and extrusion granulation to obtain a smooth surface layer raw material; The raw materials and polyethylene are fed into an extrusion casting equipment with a multi-layer co-extrusion structure for extrusion casting to obtain a polyethylene core layer and a smooth surface layer attached to at least one surface of the polyethylene core layer A cast sheet; and the obtained cast sheet is biaxially stretched to obtain a biaxially stretched polyethylene film comprising a polyethylene core layer and a smooth surface layer attached to at least one surface of the polyethylene core layer The slippery surface layer is a polyethylene layer dispersed with self-lubricating particles; the polyethylene core layer and the slippery surface layer of polyethylene have a melt index ...
Example Embodiment
[0027] Example 1
[0028] This example is used to illustrate the preparation of the polyethylene film provided by the present invention.
[0029] In this embodiment, the polyethylene forming the polyethylene core layer and the smooth surface layer was purchased from Exxon Mobil Corporation, and had a melt index of 1 g / 10 minutes at 190°C and 2.16 kg, and a melting temperature of 128°C.
[0030] (1) Preparation of smooth surface layer raw materials:
[0031] The polyethylene is dried in a hot air oven, where the drying method is continuous blowing with dry hot air at 80° C. for 8 hours. Add 99.5 parts by weight of dried polyethylene and 0.5 parts by weight of polytetrafluoroethylene microparticles (particle diameter of 1-2 microns) into the mixer and mix well at 25°C. The mixer first mixes at a low speed of 100 revolutions per minute. Approximately 7 minutes, then mix at a high speed of 200 rpm for 8 minutes;
[0032] The above-mentioned uniformly stirred mixture is fed into a twin-scr...
Example Embodiment
[0037] Example 2
[0038] This example is used to illustrate the preparation of the polyethylene film provided by the present invention.
[0039] In this example, the polyethylene forming the polyethylene core layer and the smooth surface layer was purchased from Maoming Petrochemical, and the melt index at 190°C and 2.16 kg was 2 g / 10 minutes and the melting temperature was 123°C.
[0040] (1) Preparation of smooth surface layer raw materials:
[0041] The polyethylene is dried in a hot air oven, where the drying method is continuous blowing with dry hot air at 80° C. for 8 hours. Add 97 parts by weight of dried polyethylene and 3 parts by weight of polytetrafluoroethylene particles (particle diameter of 2-4 microns) into the mixer and mix well at 25°C. The mixer first mixes at a low speed of 80 revolutions per minute. About 5 minutes, then mix for 6 minutes at a high speed of 15 rpm;
[0042] The above-mentioned uniformly stirred mixture is fed into a twin-screw extruder. Adjust th...
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