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Method for producing polyester and polyester mixture

A manufacturing method and a mixture technology, which are applied to polyesters with fast crystallization properties without adding a nucleating agent and their production fields, can solve the problems of accelerating the crystallization rate of PET, difficulty in recycling, slow crystallization rate of ethylene terephthalate, etc. problems, to achieve the effect of reducing the processing difficulty and time, and increasing the crystallization rate

Inactive Publication Date: 2020-05-05
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of slow crystallization speed of polyethylene terephthalate, those skilled in the art usually add nucleating agents (such as metal oxides, inorganic salt compounds or carboxylate compounds, etc.) to PET, To accelerate the crystallization rate of PET, but this will cause problems such as poor mechanical properties of PET or difficulties in recycling

Method used

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  • Method for producing polyester and polyester mixture
  • Method for producing polyester and polyester mixture
  • Method for producing polyester and polyester mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1873.8 grams of ethylene terephthalate monomer and 936.9 grams of terephthalic acid were placed in the reactor, and the esterification reaction was carried out in a nitrogen atmosphere to form a first polyester mixture. The nitrogen atmosphere is pressurized with nitrogen to replace the air in the reactor. The esterification reaction is carried out under normal pressure at 260°C. Afterwards, 0.748 grams of antimony trioxide and 3.75 grams of ethylene glycol solution containing 5 wt % phosphoric acid were added to the first polyester mixture to carry out a superposition reaction to form a second polyester mixture. The coincidence reaction was carried out at 275°C until the intrinsic viscosity of the second polyester mixture was greater than 0.57.

Embodiment 2

[0041] Put 1080.8 grams of terephthalic acid, 403.7 grams of ethylene glycol, 1653.7 grams of ethylene terephthalate monomer and 1.25 grams of tetraethylammonium hydroxide into the reactor for esterification to form a first polyester mixture. The esterification reaction is at 260°C and 2kg / cm2 under nitrogen pressure. Afterwards, 0.748 grams of antimony trioxide and 3.75 grams of ethylene glycol solution containing 5 wt % phosphoric acid were added to the first polyester mixture to carry out a superposition reaction to form a second polyester mixture. The coincidence reaction was carried out at 275°C until the intrinsic viscosity of the second polyester mixture was greater than 0.57.

Embodiment 3

[0051] The second polyester mixture of Example 1 was blended with the second polyester mixture of Comparative Example 4 to obtain the second polyester mixture of Example 3.

[0052] The following table 1 is the data of Examples 1-3 and Comparative Examples 1-4 of the present invention, listing respectively the intrinsic viscosity of the second polyester mixture, the content of diethylene glycol in the second polyester mixture, the second polyester mixture The polydispersity index of the polyethylene terephthalate, the crystallization melting point, the crystallization temperature and the degree of supercooling of the polyethylene terephthalate of the second polyester mixture. To further illustrate, the degree of supercooling is the difference between the crystallization melting point minus the crystallization temperature, and the degree of supercooling is an index used to measure the crystallization difficulty of polymers. The smaller the degree of undercooling, the shorter th...

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Abstract

A method for producing a polyester is provided. The method comprises mixing a ethylene terephthalate monomer comprising a structure of formula (I) with terephthalic acid to form a mixture, subjectingthe mixture to an esterification reaction to form a first polyester mixture; and carrying out coincidence reaction on the first polyester mixture, wherein diethylene glycol in the second polyester mixture is less than 1 wt% and greater than 0.1 wt%, based on the total weight of the second polyester mixture, and the polydispersity index of polyethylene terephthalate in the second polyester mixtureis greater than 2 and less than 3. The present invention provides a method for producing a polyester having rapid crystallinity and a polyester mixture, which can greatly increase the crystallizationrate of the polyester, thereby reducing the processing difficulty and time of the polyester.

Description

technical field [0001] The invention relates to a polyester and its preparation method, in particular to a polyester with fast crystallization without adding a nucleating agent and its preparation method. Background technique [0002] Polyethylene terephthalate (PET) has excellent toughness, stretchability, impact resistance, abrasion resistance and electrical insulation, so it is widely used in various plastic products. [0003] However, due to the rigidity of the main chain of polyethylene terephthalate is too large, during the crystallization period, the chain segment moves slowly, which makes the crystallization speed of polyethylene terephthalate slow, resulting in processing molding time and mold Plastic cycle is too long. It not only reduces the production speed, but also increases the production cost. [0004] In order to solve the problem of slow crystallization speed of polyethylene terephthalate, those skilled in the art usually add nucleating agents (such as me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/86
CPCC08G63/183C08G63/866C08G63/672C08G63/78C08G63/86C08G63/87C08K5/06C08L67/02
Inventor 黄德仁王正廷王筱婵李俋箴
Owner FAR EASTERN NEW CENTURY COPRRATION