Composite microporous film, and production method and use thereof
一种微多孔膜、多孔质体的技术,应用在复合微多孔膜及其制造领域,能够解决易剥离等问题,达到电池反应稳定、透过性优异、机械强度优异的效果
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Embodiment 1
[0097] (1) Preparation of fluororesin mixture
[0098] At room temperature, 2.7 parts by mass of poly(hexafluoropropylene-vinylidene fluoride) copolymer (trade name: Kynar2801, manufactured by ATOFINA Corporation, hexafluoropropylene content: about 10 mass%, melt viscosity: 2300 to 2700Pa·s) It was dissolved in 73 parts by mass of acetone to prepare a fluororesin solution. Add 24.3 parts by mass of mixed xylene to the obtained fluororesin solution (75.7 parts by mass) mol% or more than 80 mol%], the preparation of fluororesin mixture.
[0099] (2) Formation of covering layer
[0100] Polyethylene microporous film [trade name: Seti Ichira, manufactured by Tonen Chemical Co., Ltd., thickness 21.9 μm, air permeability: 253sec / 100cc, puncture strength: 3028mN / 20μm, thermal shrinkage is conveyed at a speed of 2 m / min. Efficiency: 16% (MD: 105°C / 8 hours), 5.5% (TD: 105°C / 8 hours), tensile strength at break: 90MPa (MD), 65MPa (TD), average through-hole diameter: 0.04μm, maximum po...
Embodiment 2
[0102] A composite microporous membrane was produced in the same manner as in Example 1, except that toluene (dipole moment: 0.375 Debye) was used as a poor solvent to prepare a fluororesin mixture.
Embodiment 3
[0104] Except that the mixing ratio of acetone is set to 68.1 parts by mass, and 29.2 parts by mass of 1-butanol (dipole moment: 1.68 Debye) is added as a poor solvent to prepare the fluororesin mixture, the composite microparticles are produced in the same manner as in Example 1. porous membrane.
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