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Preparation method of polyester chip for thick membrane with thickness of more than 150mum

A polyester chip and polyester technology is used in the synthesis and processing of polyester chips and the preparation of polyester raw material chips to achieve the effect of excellent performance.

Inactive Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the applicant knows, there is currently no polyester raw material chip dedicated to the production of thick films above 150 μm at home and abroad.

Method used

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  • Preparation method of polyester chip for thick membrane with thickness of more than 150mum

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preparation example Construction

[0018] In the above preparation method, the dibasic acid is one or more of terephthalic acid, phthalic acid or isophthalic acid, and the addition amount of phthalic acid or isophthalic acid is relative to the obtained 0.5% to 8% of the weight of polyester chips; the diol is one or more of ethylene glycol diols, and the molar ratio of dibasic acid to diol is 1:1.0 to 1:2.0 , preferably 1:1.1 to 1:1.6.

[0019] The polyhydric organic matter is one or more of hexanehexanol, 1,2,3,4,5-pentanepentol, and trimethylolpropane, and its addition is relative to the quality of the obtained polyester chips. 50~5000ppm. In specific operations, it can be directly added to the polyester synthesis system, or it can be prepared into a solution with a mass concentration of no more than 15% with the diol used in the reaction within the temperature range of 90-110 ° C, and then added to the polyester in the synthetic system.

[0020] The anti-adhesive agent is one of talc, calcium carbonate, ba...

Embodiment 1

[0029] In the 20L polymerization device, add 4.8kg PTA (purified terephthalic acid), 3kg EG (ethylene glycol), 1.511g ethylene glycol antimony, 0.2kg IPA (isophthalic acid), 57.6g barium sulfate, at 230 Carry out esterification reaction at ~265℃, 0.2~0.3MPa, when the water output reaches 1200ml, release the pressure to normal pressure, add 0.3g of 1,2,3,4,5-pentanepentaol, 1.025g of triphenyl phosphate , stirred at normal pressure for 10 minutes, raised the temperature and lowered the pressure to 280° C. and below 100 Pa, and reacted for 1.5 to 3 hours. After the reaction is completed, it is extruded by a melt pump, pelletized and dried to obtain polyester chips.

[0030]Pre-crystallize the obtained polyester chip, dry, extrude, longitudinally and laterally biaxially stretch, heat-set, relax, and cool to make a 150 μm single-layer film. Among them, the casting temperature is 25-45°C, the extrusion temperature is 275-285°C, the longitudinal drawing temperature is 90-120°C, the...

Embodiment 2

[0032] In a 20L polymerization device, add 4.9kg PTA, 3kg EG, 0.98g potassium fluotitanate, 0.1kgIPA, 57.6g kaolin, carry out esterification reaction at 230~265℃, 0.2~0.3MPa, and wait until the water output reaches 1200ml , release the pressure to normal pressure, add 3g of hexanediol and 0.44g of trimethyl phosphate, stir at normal pressure for 10 minutes, raise the temperature and lower the pressure to 280°C and below 100Pa, and react for 1.5 to 3 hours. After the reaction is completed, it is extruded by a melt pump, pelletized and dried to obtain polyester chips.

[0033] Pre-crystallize the obtained polyester chip, dry, extrude, longitudinally and laterally biaxially stretch, heat-set, relax, and cool to make a 175 μm single-layer film. Among them, the casting temperature is 25-45°C, the extrusion temperature is 275-285°C, the longitudinal drawing temperature is 90-120°C, the transverse drawing temperature is 90-120°C, the longitudinal drawing ratio is 3.1:1, and the trans...

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Abstract

The invention provides a preparation method of a polyester chip for a thick membrane with the thickness of more than 150mum. The preparation method which allows a polyhydroxy organic matter, an anti-bonding agent, a stabilizing agent and a catalyst to be added to one or more of diacids and one or more of dihydric alcohols which are treated as main raw materials is characterized in that: a direct esterification process is adopted, an esterification reaction is carried out for 1-3h under conditions of a temperature of 210-270DEG C and a pressure of 0.1-0.5MPa, and a polycondensation reaction is carried out for 1.5-3h under conditions of a temperature of 250-290DEG C and a pressure of equal to or less than 1KPa, the polyhydroxy organic matter is added when the esterification reaction is ended, and the polyester chip is obtained by granulating and drying after finishing the polycondensation reaction. The polyester chip has a slow crystallization rate, and when the membrane with the thickness of more than 150mum is processed from the polyester chip of the invention, casting chips do not become white and there is no need to add anti-bonding masterbatch chips; present routine production equipment can be adopted to directly produce the thick membrane; and performances of the thick membrane are excellent, and phenomena of large crystallization degree and much membrane rupture, which appear when super-bright polyester chips are used to produce the thick membrane, do not appear in the invention.

Description

technical field [0001] The invention relates to the synthesis and processing of polyester chips, in particular to a method for preparing polyester raw material chips suitable for producing films with a thickness of more than 150 μm, and belongs to the technical field of polymer chemical industry. Background technique [0002] Biaxially oriented polyethylene terephthalate film (BOPET for short) has excellent physical and chemical properties and can be widely used in many industrial fields. [0003] With the rapid development of the home appliance industry, my country's demand for thick polyester film (hereinafter referred to as thick film) has increased significantly. At present, most of the film specifications produced by the domestic BOPET double-drawing production line are in the range of 8-75 μm, and the production capacity in this range has far exceeded the demand. However, thick films of 150-300 μm have considerable room for development, especially the application rang...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K3/30C08K3/34C08K3/26C08K5/523C08K5/521C08G63/20C08G63/78
Inventor 王树霞戴钧明杨钟徐冬冬
Owner CHINA PETROLEUM & CHEM CORP
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