Polyolefin microporous membrane
A microporous membrane, polyolefin technology, applied in structural parts, battery pack parts, electrochemical generators, etc., can solve the problems of deterioration of self-discharge characteristics, short distance between electrodes, shortened distance between electrodes, etc. Manufacture, high strength, excellent self-discharge characteristics
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Embodiment 1～4
[0131] Using a twin-screw extruder, the Mw of the proportioning shown in Table 1 is 2.0×10 6 The ultra-high molecular weight polyethylene (UHMwPE) and Mw is 6.0×10 5 High-density polyethylene (HDPE) as 25 parts by mass of polyolefin resin and 75 parts by mass of liquid paraffin, and tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl) as antioxidant ) propionate] methane (0.2 parts by mass per 100 parts by mass of polyolefin resin) was melt-kneaded to prepare a polyolefin solution. The polyolefin solution was supplied to a T-die from a twin-screw extruder, and extruded. The extruded product was cooled while being taken out by a cooling roll to form a gel-like sheet. Using a synchronous biaxial tenter stretcher, the gel-like sheet was wet-stretched at 110° C. in both the MD direction and the TD direction at a stretch ratio of 5 times. The liquid paraffin was removed from the wet-stretched gel-like sheet using dichloromethane, and air-dried at room temperature to obtain a...
Embodiment 5
[0133] Using the polyolefin resin of the proportion shown in Table 1, further, as a crystallization nucleating agent, use relative to every 100 mass parts of polyolefin resin is the ADK STAB NA-11 of 0.2 mass parts, prepare polyolefin solution, and dry A polyolefin microporous membrane was produced in the same manner as in Example 1 except that the stretching ratio in the formula was changed to the stretching ratio described in Table 1. Table 1 describes the evaluation results of the obtained polyolefin microporous membrane.
Embodiment 6
[0135] A polyolefin microporous membrane was prepared in the same manner as in Example 5 except that a polyolefin solution was prepared using 0.2 parts by mass of ADKSTABNA-27 per 100 parts by mass of polyolefin resin as a crystal nucleating agent. Table 1 describes the evaluation results of the obtained polyolefin microporous membrane.
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Abstract
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