Waterproof TPU thin film and preparation method thereof
A film and intermediate layer technology, applied in chemical instruments and methods, flat products, and other household appliances, etc., can solve the problems of increasing product thickness, affecting moisture permeability and hand comfort, etc., to meet the water blocking function and strong waterproof Performance and barrier performance, good moisture permeability
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[0022] Example 1
[0023] A waterproof TPU film, which is composed of three layers of microporous films that are composited into one outer surface layer, middle layer and inner surface layer. The intermediate layer is a microporous film composed of polytetrafluoroethylene and thermoplastic polyurethane. The outer surface layer and the inner surface layer are both polyether thermoplastic polyurethane microporous films. The weight average molecular weight of the thermoplastic polyurethane in the middle layer is (5~10)×10 5 , The number average molecular weight of polytetrafluoroethylene is less than 600,000; the weight average molecular weight of the polyether thermoplastic polyurethane of the outer surface layer and the inner surface layer is (20-30)×10 5 . Among them, the weight of the polytetrafluoroethylene of the intermediate layer is 70% of the weight of the intermediate layer. The ratio of the weight of the middle layer to the weight of the outer surface layer is 0.5:1.
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Example Embodiment
[0031] Example 2
[0032] A waterproof TPU film, which is composed of three layers of microporous films that are composited into one outer surface layer, middle layer and inner surface layer. The intermediate layer is a microporous film composed of polytetrafluoroethylene and thermoplastic polyurethane. The outer surface layer and the inner surface layer are both polyether thermoplastic polyurethane microporous films. The weight average molecular weight of the thermoplastic polyurethane in the middle layer is (5~10)×10 5 , The number average molecular weight of polytetrafluoroethylene is less than 600,000; the weight average molecular weight of the polyether thermoplastic polyurethane of the outer surface layer and the inner surface layer is (20-30)×10 5 . Wherein, the weight of the polytetrafluoroethylene of the intermediate layer is 80% of the weight of the intermediate layer. The ratio of the weight of the middle layer to the weight of the outer surface layer is 1:1.
[0033]...
Example Embodiment
[0040] Example 3
[0041] A waterproof TPU film, which is composed of three layers of microporous films that are composited into one outer surface layer, middle layer and inner surface layer. The intermediate layer is a microporous film composed of polytetrafluoroethylene and thermoplastic polyurethane. The outer surface layer and the inner surface layer are both polyether thermoplastic polyurethane microporous films. The weight average molecular weight of the thermoplastic polyurethane in the middle layer is (5~10)×10 5 , The number average molecular weight of polytetrafluoroethylene is less than 600,000; the weight average molecular weight of the polyether thermoplastic polyurethane of the outer surface layer and the inner surface layer is (20-30)×10 5 . Among them, the weight of the polytetrafluoroethylene of the intermediate layer is 75% of the weight of the intermediate layer. The ratio of the weight of the middle layer to the weight of the outer surface layer is 0.8:1.
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