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Preparation method of environment-friendly special modified polyester chip for iron coating

A modified polyester and environment-friendly technology, applied in the field of preparation of environment-friendly iron-clad special modified polyester chips, can solve problems such as heavy metal pollution in food, and achieve the effect of reducing the emission of organic solvents

Active Publication Date: 2014-03-26
TIANJIN HUAXIN YINGJU POLYESTER MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has greatly improved environmental protection compared with the traditional printing and coating iron technology, due to the use of adhesives in the lamination process and the use of antimony-based catalysts in the polymerization process of ordinary polyester chips, the packaging During the process of high-temperature disinfection and cooking of high-temperature food, antimony-based catalysts will be released, causing heavy metal pollution to food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the environment-friendly iron-coated special modified polyester chips of the present invention comprises the following steps:

[0015] (1) Put ethylene glycol into the beating kettle, then add terephthalic acid, isophthalic acid, 1,4-cyclohexanedimethanol, and neopentyl glycol into the beating kettle in sequence, and the molar ratio of each feed is ethylenedi Alcohol: terephthalic acid: isophthalic acid: 1,4-cyclohexanedimethanol: neopentyl glycol = (155-195): (135-165): (11-17): 1: (4- 10), making slurry;

[0016] (2) Put ethylene glycol into the catalyst preparation tank, and then add titanium catalyst, the input mass ratio of ethylene glycol and titanium catalyst is 1:1, stir evenly to make catalyst liquid;

[0017] (3) Put ethylene glycol into the additive preparation tank, then add silicon dioxide, the mass ratio of ethylene glycol and silicon dioxide is (6-9): 1, disperse for 3-5 hours, stir evenly to make additive liquid;

[0018] (4) ...

Embodiment 1

[0025] (1) Put 668Kg of ethylene glycol into the beating kettle, then put 1565Kg of terephthalic acid, 134Kg of isophthalic acid, 9.7Kg of 1,4-cyclohexanedimethanol, and 35Kg of neopentyl glycol into the beating kettle in turn to make slurry;

[0026] (2) Put 242g of ethylene glycol into the catalyst preparation kettle, then add 242g of titanate catalyst, stir evenly to make catalyst liquid;

[0027] (3) Put 9.09Kg of ethylene glycol into the additive preparation kettle, then add 1.01Kg of silicon dioxide, disperse for 3 hours, and stir evenly to make additive liquid;

[0028] (4) Transfer the slurry in step (1) and the catalyst solution in step (2) to an esterification tank, and heat at 260°C for 3 hours of esterification;

[0029] (5) Import the reactant in step (4) into the diesterification tank, add 201 g of trimethyl phosphate and the additive liquid prepared in step (3), mix well, and heat at 235 ° C for 0.5 h of pre-condensation reaction;

[0030] (6) Import the pre-c...

Embodiment 2

[0033] (1) Put 731Kg of ethylene glycol into the beating kettle, then put 1677Kg of terephthalic acid, 156Kg of isophthalic acid, 9.7Kg of 1,4-cyclohexanedimethanol, and 49Kg of neopentyl glycol into the beating kettle in turn to make slurry;

[0034] (2) Put 328g of ethylene glycol into the catalyst preparation kettle, then add 328g of titanate catalyst, stir evenly to make catalyst liquid;

[0035] (3) Put 11.02Kg of ethylene glycol into the additive preparation kettle, then add 1.47Kg of silicon dioxide, disperse for 4 hours, and stir evenly to make additive liquid;

[0036] (4) Transfer the slurry in step (1) and the catalyst solution in step (2) to an esterification tank, and heat at 245°C for esterification for 4 hours;

[0037] (5) Import the reactant in step (4) into the diesterification tank, add 276g of trimethyl phosphate and the additive solution prepared in step (3), mix well, and heat at 225°C for 1.5h of pre-condensation reaction;

[0038] (6) Import the pre-c...

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Abstract

The invention discloses a preparation method of an environment-friendly special modified polyester chip for iron coating. The preparation method comprises the following steps of adding ethylene glycol into a pulping kettle and then sequentially adding terephthalic acid, isophthalic acid, 1,4-cyclohexanedimethanol and neopentyl glycol into the pulping kettle to prepare slurry; adding ethylene glycol into a catalyst preparation kettle, then adding a titanium catalyst and uniformly stirring to prepare catalyst liquid; adding ethylene glycol into an additive preparation kettle, then adding silicon dioxide and uniformly stirring to prepare additive liquid; leading the slurry and the catalyst liquid into a first esterification kettle, heating to perform the esterification reaction, then leading the obtained product into a second esterification kettle, adding trimethyl phosphate and the additive liquid and uniformly mixing; leading ester into a condensation polymerization kettle to carry out condensation polymerization, and vacuumizing to the degree of polymerization of 70 to 110 in the reaction process so as to obtain high-molecular polymer melt; and preparing the high-molecular polymer melt into the chip in the cooling process. The polyester chip can be widely used for iron canned products such as foods, beverages, drugs, chemical products and the like; moreover, the polyester chip also can be used for packaging of powder or emulsion pesticides and the like; discharge of an organic solvent is greatly reduced; and the environment-friendly special modified polyester chip for iron coating can replace foreign products.

Description

technical field [0001] The invention relates to a preparation method of a polyester chip, in particular to a preparation method of an environment-friendly iron-coated special modified polyester chip. Background technique [0002] At present, the process of using polyester for iron cladding at home and abroad is mainly to use polyester chips to make a film (BOPET) after biaxial stretching, and then laminate the film with the iron plate through an adhesive. Although this technology has greatly improved environmental protection compared with the traditional printing and coating iron technology, due to the use of adhesives in the lamination process and the use of antimony-based catalysts in the polymerization process of ordinary polyester chips, the packaging During the process of high-temperature sterilization and cooking of high-temperature food, antimony-based catalysts will be released, causing heavy metal pollution to food. Contents of the invention [0003] The technica...

Claims

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Application Information

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IPC IPC(8): C08G63/199C08G63/183C08G63/181C08G63/85C08G63/78C08K13/02C08K3/36C08K5/521C08L67/02
Inventor 苏志钢任大鹏曹双存田庆海王树刚冯艳宾孙双宇崔昱
Owner TIANJIN HUAXIN YINGJU POLYESTER MATERIAL SCI & TECH
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