Purple biaxial-stretching polyester film and preparation method thereof

Abstract

The invention provides a purple biaxial-stretching polyester film. The purple biaxial-stretching polyester film is of an ABA-type three-layer structure, wherein an A layer is a transparent layer, a Blayer is a colored layer, and a C layer includes purple masterbatch and optical-grade PET slice; and the A layer includes open-end masterbatch and optical-grade PET slice. When the preparation methodis compared with the prior art, the purple biaxial-stretching polyester film has the advantages of no color migration, no color fading, low haze and high gloss through selection of reasonable composition matching and a reasonable structure, and the performance of the purple biaxial-stretching polyester film is optimized. According to a preparation method of the purple biaxial-stretching polyesterfilm, related temperature parameters and mixing time are controlled reasonably, so that the performance of the purple biaxial-stretching polyester film is optimized, and the manufacture cost the purple biaxial-stretching polyester film is reduced.

Description

technical field [0001] The invention relates to the field of polyester films, in particular to a purple biaxially stretched polyester film and a preparation method thereof. Background technique [0002] Biaxially oriented polyester film has excellent physical and chemical properties, dimensional stability, and transparency, and can be widely used in packaging, printing, photosensitive materials, electrical, electronic industries and other fields. Among them, colored biaxially oriented polyester film is used in such fields as mobile phones , Digital cameras, LCD, LED and other electronic products have been widely used as an auxiliary material in the production process. With the continuous development of consumer electronics, the requirements for related materials are getting higher and higher, requiring colored polyester film During the processing, there should be no color migration, color fading and certain temperature resistance. At the same time, the polyester film is requ...

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Problems solved by technology

[0003] Patent CN201610766040.6 discloses a blue polyester film and its preparation method, including ABC three-layer structure, B layer is the middle core layer, the material is super bright polyester slice; A layer is the upper surface dyed layer, the material includes Blue masterbatch, smooth masterbatch and polyester chip, C layer is the dyed layer of the lower surface, the material includes blue masterbatch, smooth masterbatch and polyester chip, the obtained blue polyester film has the same color at 150 ℃ Migration and anti-scratch properties, but because the dyed layer A and C layers are the surface layers of the polyester film, when the dyed layer is exposed to different types of organic solvents during the coating process, there is polyester swelling that causes the blue dye to migrate Risk, the smooth masterbatch used by Sinopec Yizheng Chemical Fiber Co., Ltd. FG611 is a silica system, which has the disadvantage of large haze

[0004] Patent CN200910102022.8 discloses a polyester masterbatch for high-transparency and high-brightness films and its preparation method, including stirring Sachtoperse AB and EG evenly at a weight ratio of 1 to 1.2:1, and configuring it as a dispersion for later use; In the glycol ester BHET melt, sequentially add the dispersion liquid with a mass ratio of SachtoperseAB: BHET = 100ppm to 30000ppm, carry out pre-condensation, final polycondensation, discharge, and pelletize. Since the refractive index of SachtoperseAB is close to that of PET, the obtained parent The glossiness of the BOPET film produced by using pellets increases significantly and the haze decreases significantly, but this method has the problems of complicated preparation process and high production cost.

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