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A kind of highly transparent polyester film and preparation method thereof

A polyester film and transparent technology, applied in the field of organic polymer compounds and their preparation, can solve the problems of low haze, high light transmittance and reduced transparency, etc.

Active Publication Date: 2016-02-17
四川东方绝缘材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at the difficult problem that the anti-blocking agent used in the prior art reduces the transparency of polyester film products, uses surface-treated barium sulfate with a particle size of 2 to 4 microns as the anti-blocking agent, and a synchronous biaxial stretching process to provide a transparent Highly transparent polyester film with high light rate, low haze, and thickness of 0.036 mm to 0.35 mm and its manufacturing method

Method used

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  • A kind of highly transparent polyester film and preparation method thereof
  • A kind of highly transparent polyester film and preparation method thereof
  • A kind of highly transparent polyester film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0049] The basic technological parameter and process of embodiment 1~10:

[0050] Copolyester slices containing 0.015% to 0.12% by mass ratio of 2 to 4 micron surface-treated barium sulfate (referred to as "sulfur-containing copolyester" in Table 1 below) chips were dried at 160 to 190°C until the moisture content was lower than At 80ppm, add it into the extruder, melt and extrude at 270-330°C and filter through a fine filter with a pore size of 25μm, extrude from the single-layer head of the extruder, cool and cast on a cold drum at 15-25°C The sheet is stretched 2.5 to 4.5 times in the longitudinal and transverse directions simultaneously at 100 to 150°C, then heat-set at 160 to 250°C, and then wound and cut to obtain a single-layer structure highly transparent polyester film product . in:

Embodiment 1

[0051] The copolyester containing 0.02% of 3 micron-order surface-treated barium sulfate in Example 1 is a copolyester formed by copolymerization of 1,4-cyclohexanedimethanol, ethylene glycol, isophthalic acid, and terephthalic acid. A mixture of polyester and surface-treated barium sulfate, in which 1,4-cyclohexanedimethanol accounts for 5% by mole of diol, isophthalic acid accounts for 3% by mole of dibasic acid, and has a viscosity of 0.80dL / g.

Embodiment 2

[0052] The copolyester containing 0.015% of 4 micron-order surface-treated barium sulfate in embodiment 2 is formed by the copolymerization of 1,4-cyclohexanedimethanol, ethylene glycol, terephthalic acid, and 2,6-naphthalene dicarboxylic acid. The copolyester formed, in which 1,4-cyclohexanedimethanol accounted for 12% of the molar content of the dibasic alcohol, 2,6-naphthalene dicarboxylic acid accounted for 1% of the molar content of the dibasic acid, and the viscosity was 0.64dL / g.

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Abstract

The invention discloses a high-transparency polyester film and a preparation method thereof. The high-transparency polyester film is characterized by being of a single-layered or three-layered structure, the single-layered structure is composed of copolyester mixed with barium sulfate for surface treatment, and the thickness of the film is 0.036-0.35mm; and the preparation method of the film which is of a single-layered structure comprises the following steps: drying a copolyester chip mixed with barium sulfate for surface treatment at a temperature of 160-190 DEG C; adding the copolyester chip into an extruder; after the copolyester chip is subjected to melt extrusion at a temperature of 270-330 DEG C and filtered by a fine filter with a hole diameter of 25mu m, extruding the copolyester chip from a single-layered or three-layered composite head of the extruder; carrying out cooling and piece casting on the obtained object on a cold drum at a temperature of 15-25 DEG C, simultaneously longitudinally and transversely stretching the obtained object 2.5-4.5 times at a temperature of 100-150 DEG C, and carrying out heat setting treatment on the obtained object at a temperature of 160-250 DEG C; and coiling and cutting so as to obtain the film. The high-transparency polyester film disclosed by the invention is high in light transmittance and low in haze, and especially suitable for manufacture of flat panel display assemblies with high requirements on optical properties.

Description

technical field [0001] The invention belongs to organic polymer compounds and their preparation, and relates to a highly transparent polyester film and a preparation method thereof. The highly transparent polyester film prepared by the present invention has a wider range of applications than ordinary transparent polyester film products, and is especially suitable for flat panel display components (protective film, reflective film, diffusion film and brightness enhancement film) that require higher optical properties. ) of manufacture. Background technique [0002] Polyester film has been widely used in the electrical and electronic industry due to its excellent mechanical properties, electrical insulation properties, chemical resistance, and good transparency. In the flat panel display manufacturing industry, optical polyester film has become one of the indispensable materials in the manufacturing process of core components such as protective film, reflective film, diffusio...

Claims

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Application Information

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IPC IPC(8): B32B27/36B32B27/16B32B37/15C01F11/46
Inventor 周柯胡俊祥罗春明张世明
Owner 四川东方绝缘材料股份有限公司
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