Porous polypropylene film and power storage device
A technology of polypropylene film and power storage device, which is applied in circuits, capacitors, electric vehicles, etc., can solve the problems of improvement, mechanical strength, and thermal characteristics reduction, and achieve the effect of excellent heat resistance and excellent ion conductivity
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Embodiment 1
[0167] As polypropylene resin (A), 99.7 parts by mass of homopolypropylene FLX80E4 manufactured by Sumitomo Chemical Co., Ltd. with a melting point of 165° C. and MFR=7.5 g / 10 minutes, N,N′-bicyclo as a β crystal nucleating agent 0.3 parts by mass of hexyl-2,6-naphthalene dicarboxamide (manufactured by Shin Nippon Chemical Co., Ltd., NU-100), and 0.1 parts by mass of IRGANOX1010 and IRGAFOS168 manufactured by Ciba Specialty Chemicals as an antioxidant were carried out at this ratio. The way of mixing is to supply raw materials from the metering hopper to the twin-screw extruder, melt and knead at 300°C, discharge from the die in strips, cool and solidify in a water tank at 25°C, and cut into flakes to obtain Polypropylene composition (I).
[0168] Next, as the polypropylene resin (A), 60 parts by mass of Sumitomo Chemical Co., Ltd. homopolypropylene FLX80E4 having a melting point of 165° C. and an MFR of 7.5 g / 10 minutes, as the ethylene-α-olefin-based polymer (B ) of ethylen...
Embodiment 2
[0174] 80 parts by mass of the polypropylene composition (I) obtained in Example 1, 10 parts by mass of the polypropylene composition (II) and 10 parts by mass of the polypropylene composition (III) were dry-blended and supplied to the A layer. In a single-screw melt extruder, the polypropylene composition (I) was supplied to the single-screw melt extruder for the B layer, melt-extruded at 220°C, and foreign matter was removed with a 60 μm cut-off sintered filter Finally, use the feed block type B / A / B compound T-die to laminate at a thickness ratio of 1 / 8 / 1, and discharge it on a casting drum whose surface temperature is controlled to 120°C to obtain a cast sheet . Next, preheating was performed using a ceramic roll heated to 124° C., and stretching was performed 4.8 times in the longitudinal direction of the film. Next, the ends were gripped with jigs and stretched 8.5 times in the width direction at 151°C.
[0175] In the next heat treatment process, heat treatment is perf...
Embodiment 3
[0178] 80 parts by mass of the polypropylene composition (I) obtained in Example 1, 10 parts by mass of the polypropylene composition (II) and 10 parts by mass of the polypropylene composition (III) were dry-blended and supplied to the A layer. Single-screw melt extruder, melt extrusion at 220°C, use a sintered filter with a cut-off of 60 μm to remove foreign matter, use a T-shaped die to discharge on a casting drum whose surface temperature is controlled to 120°C and obtain casting piece. Next, it preheated using the ceramic roll heated to 120 degreeC, and stretched 5.0 times in the longitudinal direction of a film. Next, the ends were gripped with jigs and stretched 7.6 times in the width direction at 150°C.
[0179] In the next heat treatment process, heat treatment is performed at 150°C for 2 seconds (HS1 zone) while maintaining the distance between the clamps after stretching, and then relaxation is performed at 164°C with a relaxation rate of 20% and a relaxation rate o...
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