Microporous polyolefin film and process for producing the same
A technology of microporous membrane and manufacturing method, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of deterioration of cycle characteristics, insufficient battery capacity, insufficient compression resistance of microporous membrane, etc. Excellent mechanical strength and compression resistance, large pore diameter, and excellent particle removal performance
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Embodiment 1
[0081] To by Mw is 2.0×10 6 UHMWPE (Mw / Mn=8) 18% by mass, Mw is 3.0×10 5 HDPE (Mw / Mn=8.6) 82% by mass, Mw / Mn=12.0 PE (melting point: 135°C, crystal dispersion temperature: 100°C), as an antioxidant, add 0.375 parts by mass per 100 parts by mass of PE Tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate]methane to give a PE composition. 32 parts by mass of the obtained PE composition was charged into a twin-screw extruder (inner diameter 58 mm, L / D=42, strong mixing type), and 68 parts by mass of liquid paraffin were supplied from the side feeder of the twin-screw extruder , melt-kneaded under the conditions of 210° C. and 200 rpm, and prepared a PE solution in an extruder. Next, extrude the PE solution from a T-die provided at the head end of the extruder to form a thin sheet with a thickness of 1.4 mm, and form a gelatinous sheet while winding it with a cooling roll whose temperature is adjusted to 40°C. gelatinous form. The obtained gel-like molded product...
Embodiment 2
[0083] The resin concentration in the PE solution is set to 28% by mass, the temperature of the first heat treatment is set to 124°C, the second stretching is carried out at a magnification of 1.2 times along the MD direction, and the temperature of the second heat treatment is set to 131°C, except Except for this, a PE microporous membrane was produced in the same manner as in Example 1.
Embodiment 3
[0085] As shown in Table 1, the Mw used as HDPE is 3.5×10 5 , Mw / Mn is a material of 13.5, the resin concentration in the PE solution is set to 30% by mass, the temperature of the first heat treatment is set to 124°C, the magnification of the second stretch is set to 1.5 times, and the second heat treatment A PE microporous membrane was produced in the same manner as in Example 1 except that the temperature was 128°C.
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