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Process for preparing high-viscosity polyester chip

A technology for polyester chips and a production method, which is applied to the production field of high-viscosity polyester chips, can solve problems such as inability to meet industrialized production, restrict titanium-based catalysts, etc. and high production efficiency

Inactive Publication Date: 2009-08-19
CHINA RESOURCES PACKAGING MATERIALS CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the problem existing in the current production is that the solid-state polycondensation rate embodied in the production of high-viscosity polyester chips by using these titanium catalysts is only about 1 / 3 of that of the original antimony-based catalysts, which is far from meeting the needs of industrial production. It has become a bottleneck restricting the industrialization of the application of titanium-based catalysts

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] (1), mix terephthalic acid and ethylene glycol in a molar ratio of 1:1.3, add blueness agent so that its content in the total weight of polyester is 0.6ppm, and add C94 titanium catalyst from Acordis company in the Netherlands And cocatalyst magnesium acetate, the addition of catalyzer is to make the content of titanium in polyester gross weight be 20ppm, the addition of cocatalyst magnesium acetate is to make the content of magnesium in polyester gross weight be 200ppm, carry out ester after stirring Esterification reaction to obtain oligomers; the esterification reaction temperature is 250-270°C, the reaction pressure is 0.3Mpa, and the reaction time is 2.5 hours;

[0022] (2), after esterification finishes, add phosphoric acid in the oligomer that makes in the step (1) as thermal stabilizer, carry out precondensation, the phosphoric acid addition is to make the content of phosphorus in polyester gross weight be 40ppm; The pre-condensation reaction pressure is 0.8KPa,...

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PUM

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Abstract

The invention relates to a method for producing high-viscosity polyester slice. The production method comprises esterification reaction, polycondensation reaction and solid phase polycondensation reaction. The method is characterized in that titanium catalyst is added during the esterification reaction or the polycondensation reaction; cocatalyst is also added at the same time; the cocatalyst is magnesium acetate, magnesium oxalate, zinc acetate or zinc oxalate; and the addition of the cocatalyst is based on that the content of magnesian ion or zinc ion in the total weight of polyester is 50-250ppm. The invention has the advantages that the polyester has high solid phase polycondensation speed; the method can satisfy the requirement of industrial production; and the produced high-viscosity polyester slice does not contain heavy metal.

Description

1. Technical field [0001] The invention relates to a production method of polyester chips, in particular to a production method of high-viscosity polyester chips 2. Background technology [0002] The current method of producing high-viscosity polyester chips is: (1), esterification reaction: prepare dibasic alcohol and dibasic acid raw materials into slurry, stir it evenly, add it to the reactor for esterification reaction, and react to obtain oligomers (2), polycondensation reaction: the oligomer that step (1) is obtained is carried out polycondensation reaction, obtains polymer melt, through cooling, dicing, drying, obtains polyester chips; (3), solid phase polycondensation reaction: Pre-crystallize the polyester chips prepared in step (2), and then carry out solid-state polycondensation under nitrogen flow to obtain high-viscosity polyester chips; wherein catalysts are added during the esterification reaction or polycondensation reaction, and more than 90% of them use An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/189C08G63/183C08G63/85C08G63/83
Inventor 朱振达宗建平傅伟铮陈小雷陈旭徐梅
Owner CHINA RESOURCES PACKAGING MATERIALS CO LTD
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