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A kind of preparation method of pet copolyester

A technology of copolyester and polyester, applied in the field of preparation of PET copolyester, can solve problems such as increasing product cost and affecting processing, and achieves the effects of reducing processing temperature, improving transparency and realizing directional control.

Active Publication Date: 2020-10-27
ZHEJIANG HENGYI HIGH TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of isophthalic acid will greatly increase the cost of the product, and the cyclized ester produced during the polymerization process will affect the processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of PET copolyester:

[0030] In an 8 ton / h continuous polyester plant, terephthalic acid and ethylene glycol are added to the beating kettle at a molar ratio of 1:1.1, ethylene glycol antimony 0.03% mol, triethyl phosphate 0.01% mol ( (relative to phthalic acid) is added to the beating tank at the same time; after beating is completed, the slurry is transported to the esterification (I) tank, the esterification temperature is controlled at 250°C, the pressure is 60KPa, and the esterification rate is controlled at 83%. After the esterification is completed , transport the esterified product to the esterification (II) tank, and at the same time add (30% mol) parts of 2-methyl-1,3-propanediol (relative to phthalic acid), then the esterification temperature is controlled at 255 ° C, the pressure 20KPa, the esterification rate is controlled above 93%, and the esterified product of Esterification II is transported to the prepolymerization tank for prepolycondensat...

Embodiment 2

[0032] Preparation of PET copolyester:

[0033] In an 8 ton / h continuous polyester plant, terephthalic acid and ethylene glycol are added to the beating kettle at a molar ratio of 1:1.2, antimony trioxide 0.03% mol, triphenyl phosphate 0.01% mol ( (relative to phthalic acid) is added to the beating tank at the same time; after the beating is completed, the slurry is transported to the esterification (I) tank, the esterification temperature is controlled at 250°C, the pressure is 60KPa, and the esterification rate is controlled at 83%. After the esterification is completed , transport the esterification product to the esterification (II) tank, and at the same time add (20% mol) parts of 2-methyl-1,3-propanediol (relative to phthalic acid), then the esterification temperature is controlled at 255 ° C, the pressure 20KPa, the esterification rate is controlled above 93%, and the esterified product of Esterification II is transported to the prepolymerization tank for prepolycondens...

Embodiment 3

[0035] Preparation of PET copolyester:

[0036] In an 8 ton / h continuous polyester plant, terephthalic acid and ethylene glycol are added to the beating kettle at a molar ratio of 1:1.2, antimony acetate 0.03% mol, trimethyl phosphate 0.01% mol (relative to Phthalic acid) is added to the beating tank at the same time; after the beating is completed, the slurry is transported to the esterification (I) tank, the esterification temperature is controlled at 250°C, the pressure is 60KPa, and the esterification rate is controlled at 83%. After the esterification is completed, the The esterified product is transported to the esterification (II) tank, and 2-methyl-1,3-propanediol (relative to phthalic acid) is added (15% mol) at the same time, and then the esterification temperature is controlled at 255°C and the pressure is 20KPa. The esterification rate is controlled above 93%. The esterified product of Esterification II is transported to the prepolymerization tank for prepolyconden...

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Abstract

The invention relates to the field of preparation of polyester, and discloses a method for preparing PET copolyester. The method comprises the following steps: 1, mixing ethylene glycol, a catalyst, an assistant and terephthalic acid, and carrying out beating and uniform stirring, wherein a molar ratio of the terephthalic acid to the ethylene glycol is 1:(1.1-1.6); 2, conveying the obtained material to a first esterification kettle, and carrying out primary esterification; 3, adding 2-methyl-1,3-propanediol, and carrying out secondary esterification in a second esterification kettle, wherein amolar ratio of the terephthalic acid to the 2-methyl-1,3-propanediol is 1:(0-0.6); and 4, sequentially carrying out pre-polycondensation and final polycondensation to prepare the finished product. The prepared PET copolyester has the advantages of effective destroy of the regularity of the molecular structure of the polyester, reduction of the crystallization rate and the melting point, effectiveimprovement of the transparency in the blow molding process of bottles and the molding process of films, and reduction of the processing temperature.

Description

technical field [0001] The invention relates to the field of polyester polymerization, in particular to a preparation method of PET copolyester. Background technique [0002] Conventional PET polyester, due to the regularity of molecular chain segments, leads to good PET crystallization performance, fast crystallization rate, and high melting point. However, in the field of bottle flakes and sheets, this characteristic often leads to PET blowing or film stretching. Due to the fast crystallization rate of PET, the bottle or film becomes foggy and opaque, and the processing temperature is high, resulting in high energy cost. [0003] In order to improve the transparency of the product, many researchers have destroyed the regularity of the original molecular chain structure of polyester by adding a large amount of third and fourth monomers, reducing the crystallization rate, thereby reducing the crystallinity and melting point, thereby improving the bottle material. The transp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183
CPCC08G63/183
Inventor 董海良王文徐锦龙胡舒龙胡超王晓宇
Owner ZHEJIANG HENGYI HIGH TECH MATERIAL
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