Modified polyethylene terephthalate and preparation method thereof

A 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 molecular weight reduction, achieve no molecular weight reduction, increase crystallization temperature, The effect of increasing crystallinity

Active Publication Date: 2018-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But although this type of nucleating agent can have better nucleating effect, there are some side effects, such as PET and sodium benzoate, there is a degradation reaction when extruding, generating PET-Na, and the molecular weight of the final product is reduced

Method used

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  • Modified polyethylene terephthalate and preparation method thereof
  • Modified polyethylene terephthalate and preparation method thereof
  • Modified polyethylene terephthalate and preparation method thereof

Examples

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preparation example Construction

[0018] The invention provides a method for preparing modified polyethylene terephthalate, comprising: (1) reacting ethylene glycol, terephthalic acid and a crystallization accelerator in the presence of a catalyst to obtain a reaction product; (2) Remove excess unreacted ethylene glycol from the reaction product, and then carry out polycondensation under polycondensation reaction conditions to obtain modified polyethylene terephthalate; wherein, the crystallization accelerator is selected from the formula The polyvinyl acetal shown in (I),

[0019]

[0020] Among them, R is H or C 1 ~C 10 The alkyl group, n=200~1000.

[0021] According to the present invention, preferably R in formula (I) is H or n-propyl, and preferably, the polyvinyl acetal is polyvinyl formal or polyvinyl butyral.

[0022] According to the present invention, preferably, the number average molecular weight of the polyvinyl acetal is 30000-60000.

[0023] In the present invention, the polyvinyl acetal ...

Embodiment 1

[0051] This example illustrates the preparation method of the modified polyethylene terephthalate of the present invention.

[0052] Feeding see Table 1.

[0053] (1) Reaction: 500g of terephthalic acid (PTA), 250g of ethylene glycol (EG), 0.43g of tetrabutyl titanate, 0.54g of neodymium acetylacetonate, 0.16g of tributyl phosphate and 0.5 g of polyvinyl formal (PVF) was added to a 2.5L polymerization kettle for reaction. The reaction temperature is 240° C., the reaction pressure is 0.2 MPa, and the reaction time is 150 min. The water produced by the reaction is discharged through the rectification device. After the reaction finishes, the polymerization kettle pressure is reduced to normal pressure;

[0054] (2) Polycondensation reaction: Vacuumize the polymerization kettle to 600Pa to discharge unreacted ethylene glycol for 80 minutes; continue to reduce the pressure to 200Pa, and raise the temperature of the polymerization kettle to 270°C for polycondensation reaction at ...

Embodiment 2

[0057] This example illustrates the preparation method of the modified polyethylene terephthalate of the present invention.

[0058] Feeding see Table 1.

[0059] (1) Reaction: 500g of terephthalic acid (PTA), 187g of ethylene glycol (EG), 0.62g of lanthanum chloride, 0.42g of tetrabutyl titanate, 0.12g of trimethyl phosphate and 1.0 g of polyvinyl formal (PVF) was added to a 2.5L polymerization kettle for reaction. The reaction temperature is 220° C., the reaction pressure is 0.4 MPa, and the reaction time is 30 minutes. The water produced by the reaction is discharged through the rectification device. After the reaction finishes, the polymerization kettle pressure is reduced to normal pressure;

[0060] (2) Polycondensation reaction: Vacuumize the polymerization kettle to 500Pa to discharge unreacted ethylene glycol for 60min; continue to reduce the pressure to 100Pa, and raise the temperature of the polymerization kettle to 290°C for polycondensation reaction at the same...

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Abstract

The invention discloses modified polyethylene terephthalate and a preparation method thereof. The method comprises the following steps: (1) ethylene glycol, terephthalic acid and a crystallization promoter are subjected to a reaction in the presence of a catalyst, and a reaction product is obtained; (2) excess unreacted ethylene glycol is removed from the reaction product, polycondensation is performed under the polycondensation reaction condition, and modified polyethylene terephthalate is obtained, wherein the crystallization promoter is selected from polyvinyl acetal. According to the method, the crystallization rate (crystallization temperature) and crystallinity (enthalpy of fusion) of polyethylene terephthalate can be comprehensively improved without decreasing the intrinsic viscosity (molecular weight) of the polymer.

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 one of the most important synthetic materials at present. It belongs to crystalline saturated polyester and is 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C08G63/85C08G63/84C08G63/87
CPCC08G63/183C08G63/78C08G63/84C08G63/85C08G63/87
Inventor 祝桂香张伟韩翎计文希许宁
Owner CHINA PETROLEUM & CHEM CORP
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