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A kind of modified polyethylene terephthalate and preparation method thereof

A kind of technology of ethylene glycol phthalate and terephthalic acid, which is applied in the field of preparation of modified polyethylene terephthalate, can solve problems such as reducing the viscosity of polyethylene terephthalate, To achieve the effect of not reducing molecular weight, increasing crystallinity, and increasing crystallization temperature

Active Publication Date: 2018-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of how to improve the crystallinity and crystallization speed of polyethylene terephthalate without reducing the viscosity of polyethylene terephthalate, and to provide a modified polyethylene terephthalate Ethylene glycol phthalate and preparation method thereof

Method used

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  • A kind of modified polyethylene terephthalate and preparation method thereof
  • A kind of modified polyethylene terephthalate and preparation method thereof
  • A kind of modified polyethylene terephthalate and preparation method thereof

Examples

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preparation example Construction

[0015] The invention provides a preparation method of modified polyethylene terephthalate, comprising: (1) reacting ethylene glycol, terephthalic acid and a crystallization accelerator in the presence of an esterification catalyst to obtain a reaction product; 2) remove unreacted ethylene glycol from the reaction product, and then carry out polycondensation under polycondensation reaction conditions; the crystallization accelerator contains the structural unit shown in formula (1) and the structure shown in formula (2) A random copolymer of units,

[0016]

[0017] Among them, in formula (1) R 1 for C 2 -C 15 The content of the alkylene group represented by the formula (1) in the crystallization accelerator is 1-10 mol%.

[0018] The inventors of the present invention have found in research that in the esterification reaction of polyethylene terephthalate, the random copolymer containing the structural unit shown in formula (1) and the structural unit shown in formula (2...

preparation example 1

[0054] Synthesis of Crystallization Accelerator Poly(4-methyl-1-pentene-co-9-decen-1-ol)

[0055] The dry 100ml polymerization bottle was vacuumized and flushed three times with nitrogen repeatedly. At 25°C, start stirring, add 3.0ml of 4-methyl-1-pentene, 0.5ml of 9-decen-1-ol, 12.0ml of methylaluminoxane toluene solution in the polymerization bottle Each ml of methylalumoxane toluene solution contains 1.67mmol of methylalumoxane), and 1.0ml contains 50 μmol of dimethylsiloxane bis(2-methyl-indenyl)zirconium dichloride (purchased from STREM company) The toluene solution, and then start timing to carry out the copolymerization reaction at a temperature of 50° C. and a gauge pressure of 0.1 MPa for 6 hours. Stop stirring, carefully pour the reaction solution into a beaker, add acidified ethanol, stir for more than 6 hours, and filter to obtain the polymer. The polymer was vacuum dried at 60°C for 24 hours to obtain the product.

[0056] This copolymer is denoted as J-1, carr...

preparation example 2

[0058] Synthesis of Crystallization Accelerator Poly(4-methyl-1-pentene-co-9-decen-1-ol)

[0059] The dry 100ml polymerization bottle was vacuumized and flushed three times with nitrogen repeatedly. At 25°C, start stirring, add 3.0ml of 4-methyl-1-pentene, 0.1ml of 9-decen-1-ol, 12.0ml of methylaluminoxane toluene solution in the polymerization bottle Containing methylaluminoxane in every ml methylaluminoxane toluene solution is 1.67mmol), 1.0ml contains the toluene solution of 50 μ mol dimethylsiloxane bis(2-methyl-indenyl) zirconium dichloride, and then start Timely carry out the copolymerization reaction at a temperature of 40°C and a gauge pressure of 0.15 MPa for 4 hours. Stop stirring, carefully pour the reaction solution into a beaker, add acidified ethanol, stir for more than 6 hours, and filter to obtain the polymer. The polymer was vacuum dried at 60°C for 24 hours to obtain the product.

[0060] This copolymer is denoted as J-2, carries out GPC and 13 As measure...

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Abstract

The invention discloses modified polyethylene glycol terephthalate and a preparation method thereof. The preparation method comprises the following steps of (1) under the condition of existence of an esterification catalyst, enabling ethylene glycol, terephthalic acid and a crystallizing accelerant to react, so as to obtain a reaction product; (2) removing unreacted ethylene glycol out of the reaction product, and condensing under the condition of condensation reaction, wherein the crystallizing accelerant is an irregular copolymer with structure units shown in formula (I) and formula (2) (shown in the description); R1 in the formula (1) is C2-C15 alkyl; the content of the structure unit shown in formula (I) is 1-10mol% in the crystallizing accelerant. The preparation method has the advantage that the crystallizing degree, crystallizing temperature and intrinsic viscosity of polyethylene glycol terephthalate can be comprehensive improved.

Description

technical field [0001] The invention relates to a preparation method of modified polyethylene terephthalate and modified polyethylene terephthalate prepared by the method. Background technique [0002] Polyethylene terephthalate (PET) is currently one of the most important synthetic materials, mainly used in the production of fibers, films and beverage bottles. PET is cheap and has excellent wear resistance, heat resistance, chemical resistance, electrical insulation and high mechanical strength. Therefore, it began to be used as an engineering plastic in the 1960s. At present, PET engineering plastics have been used in industries such as automobiles, electrical machinery, electronics, household appliances and machinery. [0003] When PET is used as an engineering plastic, its disadvantages are that the crystallization speed is too slow, poor impact performance and high water absorption under the commonly used processing mold temperature (70-110 ° C), which limits its wide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/78C08G63/84
Inventor 祝桂香王伟张伟韩翎许宁计文希
Owner CHINA PETROLEUM & CHEM CORP