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Modified polyester and preparation method thereof

A technology of modified polyester and esterification reaction, which is applied in the field of modified polyester and its preparation, can solve the problems of the adverse effect of polyester performance and the inability to significantly reduce the cyclic oligomers in polyester, and achieve good promotion value , excellent dyeing performance and mechanical properties, the effect of narrow distribution

Active Publication Date: 2018-05-04
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the above-mentioned prior art cannot significantly reduce the content of cyclic oligomers in polyester and will adversely affect the performance of polyester itself, and provide a method that can significantly reduce the content of cyclic oligomers in polyester. The content of the polymer without affecting the performance of the polyester itself is mainly achieved by adding a branched diol with a specific structure to the raw material of the polyester.

Method used

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  • Modified polyester and preparation method thereof
  • Modified polyester and preparation method thereof
  • Modified polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of modified polyester, concrete steps are as follows:

[0040] (1) Esterification reaction;

[0041] Make slurry with terephthalic acid, ethylene glycol and 2-ethyl-2-methyl-1,3-propanediol at a molar ratio of 1:1.2:0.03, add antimony trioxide, titanium dioxide and triphenyl phosphate After mixing evenly, carry out the esterification reaction under pressure in a nitrogen atmosphere. At the end of the oxidation reaction, the addition of antimony trioxide is 0.01% of the weight of terephthalic acid, the addition of titanium dioxide is 0.20% of the weight of terephthalic acid, and the addition of triphenyl phosphate is 0.01% of the weight of terephthalic acid. 0.05%, wherein the structural formula of 2-ethyl-2-methyl-1,3-propanediol is as follows:

[0042]

[0043] (2) polycondensation reaction;

[0044] After the esterification reaction is over, start the polycondensation reaction in the low vacuum stage under negative pressure conditions. Wit...

Embodiment 2

[0061] The preparation method of modified polyester, concrete steps are as follows:

[0062] (1) Esterification reaction;

[0063] Make a slurry of terephthalic acid, ethylene glycol and 2,2-diethyl-1,3-propanediol with a molar ratio of 1:1.3:0.04, add antimony ethylene glycol, titanium dioxide and trimethyl phosphate and mix well Finally, the esterification reaction is carried out under pressure in a nitrogen atmosphere, the pressurized pressure is normal pressure, and the temperature of the esterification reaction is 260 ° C. When the amount of water distilled in the esterification reaction reaches 91% of the theoretical value, it is an esterification reaction. End point, wherein the addition of ethylene glycol antimony is 0.02% of the weight of terephthalic acid, the addition of titanium dioxide is 0.21% of the weight of terephthalic acid, and the addition of trimethyl phosphate is 0.03% of the weight of terephthalic acid , wherein the structural formula of 2,2-diethyl-1,3...

Embodiment 3

[0076] The preparation method of modified polyester, concrete steps are as follows:

[0077] (1) Esterification reaction;

[0078] Prepare a slurry of terephthalic acid, ethylene glycol and 2-butyl-2-ethyl-1,3-propanediol with a molar ratio of 1:1.4:0.05, add antimony acetate, titanium dioxide and trimethyl phosphite to mix After uniformity, carry out esterification reaction under pressure in a nitrogen atmosphere, the pressurized pressure is 0.1MPa, the temperature of the esterification reaction is 252 ° C, when the amount of water distilled in the esterification reaction reaches 92% of the theoretical value, it is esterification At the end of the reaction, the addition of antimony acetate is 0.03% of the weight of terephthalic acid, the addition of titanium dioxide is 0.23% of the weight of terephthalic acid, and the addition of trimethyl phosphite is 0.01% of the weight of terephthalic acid , wherein the structural formula of 2-butyl-2-ethyl-1,3-propanediol is as follows: ...

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Abstract

The invention relates to modified polyester and a preparation method thereof. Terephthalic acid, ethylene glycol and dihydric alcohol with branched chains are uniformly mixed and are then sequentiallysubjected to esterification reaction and condensation polymerization to obtain the modified polyester, wherein the dihydric alcohol with branched chains has the structural formula shown in the description; in the formula, R1 and R2 respectively and independently select straight chain alkylidene with the carbon number being 1 to 3; R3 selects alkyl with the carbon number being 1 to 5; R4 selects alkyl with the carbon number being 2 to 5. The molecular chain of the finally prepared modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment and a dihydric alcohol chain segment with branched chains; the content of annular low polymers in the modified polyester is smaller than or equal to 0.6 weight percent. The method has the advantages that the content of the annular low polymers in the modified polyester can be obviously reduced; the influence on the performance of the polyester pre se cannot be caused; the prepared modified polyester has high molecular weight; the distribution is narrow; good popularization values are realized.

Description

technical field [0001] The invention belongs to the field of polymer modification, and relates to a modified polyester and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is a polymer with excellent properties. PET is widely used in fibers, bottles because of its advantages such as high modulus, high strength, good shape retention and good barrier properties. In the fields of packaging, film and sheet materials, the output is increasing year by year, and the industry status has been significantly improved. [0003] However, during the polycondensation reaction of synthesizing ethylene terephthalate, especially when producing linear high polymers, linear and cyclic oligomers are also accompanied by high-temperature oxidative degradation, and cyclic oligomers are polycondensed The stage is formed due to the back-biting and cyclization of the macromolecular chain ends. More than 70% of the cyclic oligomers are cyclic trimers. The cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/86
CPCC08G63/183C08G63/866
Inventor 汤方明王丽丽李文刚
Owner JIANGSU HENGLI CHEM FIBER
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