Method for reducing content of acetaldehyde in granulated polyester slice

A polyester chipping and pelletizing technology, which is applied in the field of reducing the content of acetaldehyde in polyester chips after pelletizing, can solve the problems of migration to the content, decrease in product transparency, and failure to meet higher performance requirements, etc., to achieve the reduction of acetaldehyde Aldehyde content, the effect of improving product quality

Inactive Publication Date: 2012-06-13
CHINA RESOURCES PACKAGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a risk of migration into the contents during use of the manufactured product
[0005] In addition, U.S. Patents US4,837,115, 5,340,884, etc. disclose that these patents reduce the acetaldehyde content in the product by adding polyamide substances during the slicing process, because the compatibility of polyamide and polyester is poor, resulting in Decreased transparency of the final product
[0006] Although there are some methods that can achieve relatively low acetaldehyde content in polyester products, there are still some shortcomings in these methods, and they cannot meet the higher performance requirements in terms of indicators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The polyethylene terephthalate (PET) production line is a continuous polyester production line with an output of 360 tons per hour. The pelletizer used is produced by German Rieter company, the model is VSG600 / H. First, the slurry prepared by terephthalic acid (PTA), ethylene glycol (EG), antimony acetate and toner is subjected to esterification reaction and polycondensation reaction respectively to obtain a polycondensation reactant; the polycondensation reactant is then cooled by cooling water After pelleting, slices are obtained; sodium bicarbonate is added in the cooling water, and the addition of sodium bicarbonate in the cooling water is 0.5% by weight; the water temperature of the cooling water is 36°C; the moisture content in the slices after the test pelleting is 355ppm, and the slices Stored in the silo for 24 hours, the acetaldehyde content in the slices was measured to be 25ppm (the acetaldehyde content test refers to the acetaldehyde content test method spec...

Embodiment 2

[0017] The polyethylene terephthalate (PET) production line is a continuous polyester production line with an output of 360 tons per hour. The pelletizer used is produced by German Rieter company, the model is VSG600 / H. First, the slurry prepared by terephthalic acid (PTA), ethylene glycol (EG), antimony acetate and toner is subjected to esterification reaction and polycondensation reaction respectively to obtain a polycondensation reactant; the polycondensation reactant is then cooled by cooling water After pelleting, slices are obtained; potassium bicarbonate is added in the cooling water, and the amount of potassium bicarbonate added in the cooling water is 0.5% by weight; the water temperature of the cooling water is 38° C.; the moisture content in the slices after testing is 350ppm, and the slices Put it in the silo and store it for 36 hours; the acetaldehyde content in the slices was measured to be 21ppm (the acetaldehyde content test refers to the acetaldehyde content te...

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PUM

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Abstract

The invention relates to a method for reducing content of acetaldehyde in granulated polyester slice. The method comprises the steps of: cooling a polycondensation reactant, which is prepared by performing esterification and polycondensation to materials, with cooling water and then sized-dicing the polycondensation reactant to acquire a slice; the method is characterized by adding bicarbonate to the cooling water, wherein the bicarbonate is sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, calcium bicarbonate or ammonium bicarbonate; the added amount of the bicarbonate to the cooling water is 0.1-5% by weight; and the temperature of the cooling water ranges from 35 DEG C to 40 DEG C. The method has the advantages of greatly reducing the content of acetaldehyde in the sized-diced slice, so that the quality of the product is simply and economically improved.

Description

technical field [0001] The present invention relates to a kind of polyester chip (comprising polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate) after reducing granulation ) production method for acetaldehyde content; the method is used to reduce the acetaldehyde content in melt-polymerized chips in the production process of polyester chips. The method can simply and economically improve product quality and reduce production cost. technical background [0002] Polyester is a general term for thermoplastic linear saturated polyester produced after copolymerization of glycol and dibasic acid, mainly including polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate Glycol esters, polyethylene naphthalate, etc. An important use of polyesters, especially polyethylene terephthalate, is in the field of food packaging. It occupies an important position in social life, mainly used in bever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/90
Inventor 朱振达宗建平陈小雷陈旭徐梅
Owner CHINA RESOURCES PACKAGING MATERIALS CO LTD
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