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Chemical resistant highly-transparent polyester film and method for preparing same

A polyester film, chemical resistance technology, applied in the field of highly transparent and flexible polyester alloy film and its preparation, can solve the problems that have not been publicly solved, such as the whitening resistance of the film and organic solvents, and achieve high transparency and low poplar The effect of the modulus

Inactive Publication Date: 2008-05-14
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the existing polyester film manufacturing technology, there is no technical content to solve the whitening resistance of the film when it is in contact with an organic solvent. needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] PET with an intrinsic viscosity of 0.62 and PTT with an intrinsic viscosity of 0.90 were dried in a vacuum oven at 160°C for 5 hours, and the two slices were mixed according to the weight ratio of PTT / PET of 50 / 50, and then passed through a screw with a diameter of 15 mm, length-to-diameter ratio (L / D) of 60 twin-screw extruder (manufactured by Technovel) for melt blending and extrusion to obtain blended chips. The temperature of the feed section of the extruder is 230°C, the temperature of the remaining sections is 260°C, the screw speed is 100 rpm, and the resin stays in the extruder for 10 minutes on average. The resulting slices were dried in a vacuum oven at 160° C. for 5 hours, melted and pressurized at 280° C. by a press, and quenched in an ice-water bath to obtain a polyester film with a thickness of about 210 μm. The cold crystallization peak temperature T of the resulting film cc and glass transition temperature T g They are 116.8°C and 62.2°C, respectively....

Embodiment 2

[0026]Except that in embodiment 1, the composition ratio of the two kinds of polyester PTT / PET is specified as 60 / 40, the screw speed is 80 rpm, and the resin stays in the extruder for an average of 15 minutes. Films were obtained in the same way. The cold crystallization peak temperature T of the resulting film cc and glass transition temperature T g They are 94.5°C and 60.9°C, respectively. It has a Young's modulus of 7.6MPa when stretched at 80°C and a stress of 0.31MPa at 400% strain. The initial haze value of the resulting film was 0.4%. The total haze values ​​after soaking in methyl ethyl ketone, ethyl acetate and toluene for 5 minutes were 1.2%, 0.9% and 0.6%, respectively, and the internal haze values ​​were 0.5%, 0.4% and 0.2%, respectively.

Embodiment 3

[0028] Except that in Example 1, the composition ratio of the two polyesters PTT / PET is specified as 70 / 30, and a twin-screw extruder with a length-to-diameter ratio (L / D) of 80 is used, the same method as in Example 1 is used. method to obtain thin films. The cold crystallization peak temperature T of the resulting film cc and glass transition temperature T g They are 90.9°C and 61.3°C, respectively. It has a Young's modulus of 8.7MPa when stretched at 80°C and a stress of 0.36MPa at 400% strain. The initial haze value of the resulting film was 0.9%. The total haze values ​​after soaking in methyl ethyl ketone, ethyl acetate and toluene for 5 minutes were 1.4%, 1.2% and 1.1%, respectively, and the internal haze values ​​were 0.5%, 0.4% and 0.3%, respectively.

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Abstract

The invention discloses a chemical resistant and high transparent polyester alloy film and the preparation method. The polyester alloy film is prepared through polyethylene terephthalate (PET) and polyethylene terephthalate (PTT) by a twin-screw extruder with a slenderness ratio of 40 to 100; wherein the content of PPT is 30 percent to 80 percent, and the rest is PET. The peak temperature of the cold crystallization of the prepared film is ranged from 80 DEG C to 125 DEG C; the vitrification conversion temperature is 59 DEG C to 70 DEG C. The preparation method is characterized in that the dried PTT and PET slices are melted and extruded together through the extruder, so that an unoriented polyester alloy film is prepared. The invention has the advantages that: the prepared film has lower modulus of the Young, high transparency and excellent organic solvent blushing resistance; the film can keep a high transparency while soaking in various typical organic solvent; the total haze value is less than 2.5 percent, wherein the inner haze is less than 1.0 percent, and the haze value does not increase along with time.

Description

technical field [0001] The invention relates to a chemical film and a preparation method thereof, in particular to a highly transparent and flexible polyester alloy film with excellent chemical resistance suitable for pattern transfer printing technology and a preparation method thereof. Background technique [0002] Because polyester film has good mechanical, electrical insulation, optics, barrier, chemical resistance and heat resistance, it is widely used in fields such as tapes, capacitors, labels, packaging, graphics, photosensitive and agricultural films. Through measures such as surface treatment and compounding, the performance of polyester film can be further improved to meet the growing market demand with more demanding requirements. [0003] Ensuring the high transparency of the film is a basic requirement in many applications of polyester films. When ordinary polyester films are heated or contacted with some organic solvents, the film will be whitened due to the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/03B29C47/14B29C47/60B29C47/76B29C48/305B29C48/76
Inventor 陈敬禄樊新昌夏天
Owner TORAY FIBER RES INST(CHINA) CO LTD
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