PE breathable film with high strength and high barrier filtering performance and composite fabric prepared from PE breathable film
A technology of composite fabrics and breathable membranes, applied in the field of breathable membranes, can solve the problems of poor uniformity of breathable membranes, low mechanical strength and transverse strength, and limited protective effect, so as to improve poor uniformity of apertures, improve filtration efficiency and reliability, and improve The effect of transverse mechanical strength
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Embodiment A1
[0044] A preparation method of PE breathable film, comprising the following steps:
[0045] The polyethylene and plasticizer are blended through a twin-screw extruder to form a homogeneous blend, and then the homogeneous blend is sequentially cast, biaxially stretched, extracted, heat-set and rolled to obtain PE breathable membrane. The weight-average molecular weight of polyethylene is 1.2 million, and the plasticizer is paraffin oil; in terms of mass percentage, the polyethylene in the homogeneous blend is 25wt%, and the rest is plasticizer.
[0046] During the blending, the temperature of the extruder was 195° C., and the rotation speed of the screw of the extruder was 60 rpm.
[0047] The temperature of the cast sheet was 15° C., and the cooling roll speed was 5.1 m / min.
[0048] Two-way stretching is divided into longitudinal stretching and transverse stretching. The temperature of longitudinal stretching is 116°C, and the ratio of longitudinal stretching is 7.43 times;...
Embodiment A2
[0050] A preparation method of PE breathable film, comprising the following steps:
[0051] The polyethylene and plasticizer are blended through a twin-screw extruder to form a homogeneous blend, and then the homogeneous blend is sequentially cast, biaxially stretched, extracted, heat-set and rolled to obtain PE breathable membrane.
[0052] The weight-average molecular weight of the polyethylene is 1.2 million, and the plasticizer is paraffin oil; in terms of mass percentage, the polyethylene in the homogeneous blend is 25 wt%, and the rest is the plasticizer.
[0053] During the blending, the temperature of the extruder was 195° C., and the rotation speed of the screw of the extruder was 60 rpm.
[0054] The temperature of the cast sheet is 15°C, and the speed of the cooling roll is 5.4m / min; The temperature is 125°C, and the transverse stretching ratio is 9.3 times; the extraction temperature is 23°C; and the heat setting temperature is 131°C.
Embodiment A3
[0056] A preparation method of PE breathable film, comprising the following steps:
[0057] The polyethylene and plasticizer are blended through a twin-screw extruder to form a homogeneous blend, and then the homogeneous blend is sequentially cast, biaxially stretched, extracted, heat-set and rolled to obtain PE breathable membrane.
[0058] The weight-average molecular weight of the polyethylene is 1.2 million, and the plasticizer is paraffin oil; in terms of mass percentage, the polyethylene in the homogeneous blend is 28 wt%, and the rest is the plasticizer.
[0059] During the blending, the temperature of the extruder was 195° C., and the rotation speed of the screw of the extruder was 68 rpm.
[0060] The temperature of the cast sheet is 15°C, and the speed of the cooling roll is 4.6m / min; The temperature is 126°C, and the transverse stretching ratio is 9.3 times; the extraction temperature is 23°C; and the heat setting temperature is 130°C.
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