MIcroporous polyolefin film
A technology of polyolefin microporous membrane and polyolefin resin, applied in the field of polyolefin microporous membrane, can solve the problems of reduced membrane strength, low membrane strength, uneven surface pore structure, etc.
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Embodiment 1
[0141] 40 parts by weight of high-density polyethylene (weight average molecular weight 250,000, molecular weight distribution 7, density 0.956), 0.3 parts by weight of 2,6-di-tert-butyl-p-cresol were mixed in Henschel Dry mix in an oven and feed into a 35mm twin-screw extruder. Then 60 parts by weight of bis(2-ethylhexyl) phthalate was added to the extruder, followed by melt-kneading at 230°C. The kneaded product was extruded onto a cooling roll whose surface temperature was controlled at 40°C, and passed through a coat hanger die to obtain a sheet having a thickness of 1.8 mm. Subsequently, use a tenter and simultaneous biaxial stretching machine to stretch the sheet 7 times × 7 times in advance, and then soak it in 2-butanone to extract and remove phthalic acid bis(2- ethylhexyl) ester. Subsequently, the adhering 2-butanone was removed by drying, and then the thus-treated sheet was subjected to 1.3-fold extraction in the width direction and stretched to obtain a microporo...
Embodiment 2
[0143] In the same manner as in Example 1, except that the ratio of post-extraction stretch in the width direction was changed to 1.7 times, a microporous membrane was obtained. As shown in Table 1, the resulting microporous membranes had very high permeability without loss of high penetration. Figure 5 and Figure 6 showing the surface structure of the microporous membrane observed with a scanning electron microscope, Figure 7 Shows the cross-sectional structure of the microporous membrane observed with a scanning electron microscope. The obtained microporous membrane has a uniform porous structure containing highly dispersed microfibers, and the inner layer part is rougher than the surface layer part.
Embodiment 3
[0145] 40 parts by weight of high density polyethylene as described in Example 1 and 0.3 parts by weight of 2,6-di-tert-butyl-p-cresol were dry mixed in a Henschel mixer and added to a 35 mm in a twin-screw extruder. Then 60 parts by weight of bis(2-ethylhexyl) phthalate was added to the extruder, followed by melt-kneading at 230°C. The kneaded product was extruded onto a cooling roll whose surface temperature was controlled at 25°C, and passed through a coat hanger die to obtain a sheet having a thickness of 1.8 mm. Subsequently, use a tenter and simultaneous biaxial stretching machine to stretch the sheet 7 times × 7 times in advance, and then soak it in dichloromethane to extract and remove phthalic acid bis (2-ethylhexyl) ester. Subsequently, the adhered methylene chloride was removed by drying, and the thus-treated sheet was stretched 1.8 times in the width direction with a tenter stretcher and thermally relaxed by 50% in the width direction to obtain microporous membr...
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Abstract
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