Novel ceramic coating polyolefin composite film and preparation method thereof
A technology of ceramic coating and polyolefin, which is applied in the field of preparation of the composite film, can solve problems such as bad gas and side effects of lithium-ion batteries
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[0044] Example 1
[0045] 35 parts by weight of glass powder (average particle size 0.6μm), 55 parts by weight of alumina (average particle size 0.8μm, specific surface area about 15m 2 / g), 8 parts by weight of styrene butadiene rubber emulsion and 120 parts by weight of water are mixed, dispersed for (2-3) hours, and allowed to stand for defoaming (1-2) hours to obtain a coating liquid.
[0046] Use 16μm ultra-high molecular weight polyethylene base film (abbreviated as UHMWPE, the same below), with an average pore size of 40-65nm, porosity of 40%, air permeability value of 200s / 100ml, 105℃, 1h heat shrinkage MD direction is 2.1%, , TD direction is 0.6%, puncture strength is 650g. The UHMWPE surface is pretreated with the photosensitizer benzophenone, and the UHMWPE surface is irradiated with ultraviolet light with a wavelength of 290nm to make the surface cross-linked, and then the benzophenone can be removed by sublimation without residue.
[0047] The above coating solution was...
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[0048] Example 2
[0049] The multilayer composite microporous film was prepared according to the method of Example 1, except that it was coated on one surface of the UHMWPE base film, that is, the total thickness of the coating was 4 μm.
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[0050] Example 3
[0051] The multi-layer composite microporous film was prepared according to the method of Example 1, except that 20 parts by weight of glass powder (average particle size 0.6μm) was used instead of 35 parts by weight of glass powder (average particle size 0.6μm), and 70 weight parts were used. Parts of alumina (average particle size 0.8μm, specific surface area about 15m 2 / g) Replace 55 parts by weight of alumina (average particle size 0.8μm, specific surface area about 15m 2 / g).
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