Self-cleaning matte polyester film and preparation method thereof

Abstract

The invention relates to the technical field of polyester film preparation, in particular to a self-cleaning matte polyester film and a preparation method thereof.The preparation method comprises the steps that raw materials are added into a high-speed stirrer and stirred for set time at the set rotating speed, the raw materials are fully and evenly mixed, and a blended material is obtained; adding the blended material into a double-screw extruder for melt extrusion to obtain a modified polyester melt; extruding the modified polyester melt through a T-shaped die head, and carrying out casting piece forming on a casting piece roller to obtain a polyester casting piece; sequentially carrying out longitudinal stretching and transverse stretching on the polyester casting sheet; the polyester film subjected to two-way stretching is subjected to heat setting treatment in a heat setting drying oven and then wound, and the self-cleaning matte polyester film is obtained. The water contact angle is larger than 120 degrees, the oil contact angle is larger than 90 degrees, the haze reaches 40%-98%, the self-cleaning performance and the matte effect are improved, and meanwhile it is guaranteed that the polyester film has good mechanical performance and optical performance through a reasonable raw material formula and process control.

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