Separator for batteries and method for producing separator for batteries
A battery and separator technology, applied in the field of battery separators, can solve problems such as difficulty in ensuring safety, and achieve the effects of excellent shutdown performance, electrode adhesion, and excellent electrolyte permeability
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[0081] (1) Preparation process of polyolefin resin solution
[0082] The polyolefin resin solution is prepared by adding a suitable film-forming solvent to the above-mentioned polyolefin resin, followed by melt-kneading. Various additives such as the above-mentioned inorganic fillers, antioxidants, ultraviolet absorbers, antiblocking agents, pigments, and dyes can be added to the polyolefin resin solution as needed within a range that does not impair the effects of the present invention. For example, micronized silicic acid can be added as a pore former.
[0083] As the film-forming solvent, any of liquid solvents and solid solvents can be used. Examples of the liquid solvent include aliphatic or cyclic hydrocarbons such as nonane, decane, decalin, p-xylene, undecane, dodecane, and liquid paraffin, and mineral oil fractions having boiling points corresponding to them. In order to obtain a gel-like sheet with a stable solvent content, it is preferable to use a non-volatile li...
Embodiment 1
[0231] In 100 parts by mass, the mass average molecular weight (Mw) of 30 mass% is 2.5×10 6 The Mw of ultra-high molecular weight polyethylene (UHMWPE) and 70% by mass is 2.8×10 5 Dry mixing of 0.375 parts by mass of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)- propionate] methane to give a mixture. ΔHm (≦125°C) measured for the PE composition composed of UHMWPE and HDPE was 11%, T (50%) was 134.7°C, and the crystal dispersion temperature was 100°C.
[0232] Mw of UHMWPE and HDPE was determined by gel permeation chromatography (GPC) under the following conditions (the same applies hereinafter).
[0233] ・Measuring device: GPC-150C manufactured by Waters Corporation
[0234] ・Column: Showa Denko Co., Ltd. "Shodex" (registered trademark) UT806M
[0235] ·Column temperature: 135℃
[0236] Solvent (mobile phase): o-dichlorobenzene
[0237] ·Solvent flow rate: 1.0mL / min
[0238] ・Sample concentration: 0.1% by mass (dissolution condition: 135°C / 1h)
[0239] ·Loa...
Embodiment 2
[0249] In 100 parts by mass, the mass average molecular weight (Mw) of 30 mass% is 2.5×10 6 The ultra-high molecular weight polyethylene (UHMWPE) and 70% by mass of Mw is 3.0×10 5 Dry mixing of 0.375 parts by mass of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)- propionate] methane to give a mixture. ΔHm (≦125°C) measured for the PE composition composed of UHMWPE and HDPE was 14%, and T (50%) was 132.5°C.
[0250] 25 parts by mass of the obtained mixture was charged into a strong mixing type twin-screw extruder (amount of polyethylene composition input Q: 120 kg / h), and 75 parts by mass of liquid was supplied from the side feeder of the twin-screw extruder Paraffin wax was melt-kneaded at a temperature of 210° C. (Q / Ns: 0.3 kg / h / rpm) while maintaining the screw rotation speed Ns at 400 rpm to prepare a polyethylene solution.
[0251] The obtained polyethylene solution was supplied to a T-die from a twin-screw extruder, and extruded into a sheet-like molded body....
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