Multilayered co-extruded bidirectional-stretching light reflection polyester thin film and manufacturing method thereof
A biaxial stretching, multi-layer co-extrusion technology, applied in the field of optical polyester film and its manufacturing, can solve the problems of large equipment investment, complex manufacturing process and reduced tensile strength.
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Embodiment 1-1
[0067] The first part A layer film compound (embodiment 1-1~1-15)
[0068] The percentages of materials in the following examples are all percentages by mass.
[0069] Example 1-1:
[0070] 79.88% polyester chips, 5% rutile titanium oxide with a particle size of 15 μm, 15% barium sulfate with a particle size of 10 μm, 0.05% H10 heat stabilizer, 0.05% 770 light stabilizer, 0.02% OB-1 fluorescent whitening agent in the material The mixture was evenly mixed in the silo, and after being dehydrated and dried, it was melt-extruded and granulated by a twin-screw extruder at 285°C to obtain a layer A film mixture, which was set aside.
Embodiment 1-2
[0072] 75.75% polyester chips, 8% rutile titanium oxide with a particle size of 14 μm, 16% barium sulfate with a particle size of 10 μm, 0.1% H10 heat stabilizer, 0.1% 770 light stabilizer, 0.05% OB-1 fluorescent whitening agent in the material The mixture was evenly mixed in the silo, and after being dehydrated and dried, it was melt-extruded and granulated by a twin-screw extruder at 285°C to obtain a layer A film mixture, which was set aside.
Embodiment 1-3
[0074] 71.5% polyester chips, 8% rutile titanium oxide with a particle size of 12 μm, 20% barium sulfate with a particle size of 7 μm, 0.2% H10 heat stabilizer, 0.2% EV-761 light stabilizer, 0.1% OB-1 fluorescent whitening agent Mix evenly in the silo, after dehydration and drying, melt extrude and granulate by twin-screw extruder at 280°C to obtain layer A film compound, which is ready for use.
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