Surface-treated fillers for biaxially oriented polyester films
A technology of biaxial orientation and surface treatment, applied in synthetic resin layered products, chemical instruments and methods, layered products, etc., can solve the problems of high opacity, low density, and inability to prepare microporous films.
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Embodiment 1
[0467] The preparation of embodiment 1-masterbatch
[0468] A masterbatch comprising P1 and one of the calcium carbonate fillers CC1-CC6 was prepared on a laboratory scale twin-screw extruder (ZSE27HP-40D from Leistritz, Germany). The polymer PET was pre-dried in an oven at 90°C for 6 hours before processing. The composition and filler content of the prepared masterbatches are summarized in Table 1 below. The exact filler content is determined by the ash content.
[0469] Table 1 : The composition and filler content of the prepared masterbatch
[0470] masterbatch filler Filler content [% by weight] Ash content [% by weight] Mineral Dispersion Quality MB1 (this invention) CC1 45 37.4 it is good MB2 (this invention) CC2 45 39.3 it is good MB3 (comparison) CC3 45 39.3 Low MB4 (comparison) CC4 45 39.8 Low MB5 (comparison) CC5 45 39.5 Low MB6 (the present invention) CC6 45 40.1 it is good ...
Embodiment 2
[0472] The preparation of embodiment 2-polyester casting film
[0473] Cast films were produced on a Collin Laboratory Film Line (Dr. Collin GmbH, Germany) using a twin-screw extruder with a 30 mm diameter T-die and a take-up system with temperature-controlled chill rolls. The chill roll was kept 20 mm from the T-die to produce a polyester sheet with a thickness of about 500 μm. Extruder and die temperatures were consistent throughout the experiment. The mold temperature was set at 270 °C; the line speed was 0.5 m / min. Masterbatches or polymers were mixed with neat pre-dried polymer P1 to receive cast films with the concentrations provided in Table 2.
[0474] Table 2: Composition and properties of the prepared cast film
[0475]
[0476] All films shown in Table 2 are cast films, which were produced in good quality with a visually good appearance.
Embodiment 3-
[0477] Example 3 - Preparation of Biaxially Oriented Polyester Film
[0478] The cast films were stretched using a biaxial laboratory stretching machine (Model Maxi Grip 750S Bi-axial Laboratory Stretching Frame from Dr. Collin GmbH, Germany). A cast film with dimensions of 135 mm x 135 mm and a film thickness of about 500 μm (exact values given in Table 2) was clamped with 9 x 9 clamps and heated to 90° C. (measured at the surface of the cast film) by an infrared system. The warm-up time before drawing was fixed for 2 minutes, then 6 000mm / s was utilized resulting in a speed of 345mm / s x 345mm / s 2 x 6 000mm / s 2 The acceleration stretches the film to the final draw ratio by simultaneous biaxial stretching. After stretching to final dimensions, the film was immediately air cooled to room temperature by a fan and then removed from the stretcher. The film was drawn to a target draw ratio of 3.3 x 3.3 (230% x 230%). Stretch ratio and temperature were kept constant for all ...
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Abstract
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