Polyester of terephthalic acid, method for the production thereof, and use of the same

A technology of terephthalic acid and polyester, applied in the direction of one-component copolyester rayon filament, etc., can solve the problems of unrealized constant yarn quality level and high cost, and achieve low by-products/decomposition products, cost Beneficial, lower melting temperature effect

Inactive Publication Date: 2008-09-03
德国登肯多夫纺织与纤维研究学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Such new POY technologies have not yet been implemented on a large scale industrially, as they are often associated with high costs and do not achieve a constant quality level of the yarn

Method used

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  • Polyester of terephthalic acid, method for the production thereof, and use of the same
  • Polyester of terephthalic acid, method for the production thereof, and use of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] Embodiment: adopt 10mol% 1, the modification of 2-butanediol

[0032] 12,126 g dimethyl terephthalate (62.44 mol), 7,848.8 g ethylene glycol (126.45 mol) and 1,266.22 g 1,2-butanediol were placed in a 20-liter stainless steel reactor at Mn(OAc) 2 4H 2 Catalyzed by O, transesterification was performed under methanol dissociation in a conventional manner, and the formed copolyester was prepared on Sb 2 o 3 Catalyzed polycondensation to form copolyesters. The reaction can be carried out here at 260°C.

[0033] DSC measurements were performed in the temperature range of 30-300° C. with a heating rate of 10 K / min under nitrogen atmosphere.

[0034] The polyester is conventionally spun into fibers by melt spinning. Very good spinnability of 3000-6000 m / min has been shown.

[0035] Table 1 below shows the effect of modification on melting temperature and spinning temperature.

[0036] Table 1:

[0037] unmodified polyester

10% 1,2-butanediol modified ...

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Abstract

The invention relates to a polyester based on a polycondensation product of terephthalic acid and/or terephthalic acid derivatives comprising bivalent alcohols. Said polyester is characterised in that (I) between 40 and less than 90 mol. % of ethylene glycol, propane-1,3-diol and/or butane-1,4-diol is combined with (II) between 60 and more than 10 mol. % alkane-l,2-diol, exclusively ethylene glycol, and the polyester has a melting point of between approximately 145 and 250 DEG C (in accordance with DIN EN ISO 53765). It has a comparatively low melting point, such that it can be retreated at the lower melting temperature. This prevents undesired secondary and decomposition reactions during the retreatment, and enables energy costs to be reduced.; The inventive polyester is especially suitable for producing fibres or filaments by melt-spinning, and films, bottles and other moulded parts according to an injection moulding method. The fibres can be treated to form a high-quality nonwoven material.

Description

technical field [0001] The present invention relates to polyesters based on polycondensation products of terephthalic acid and / or derivatives of terephthalic acid with diols, processes for the preparation of such polyesters, their use and the products obtained therefrom. Background technique [0002] Polyesters of the abovementioned type, their preparation and their advantageous application possibilities are known. However, a number of practical problems remain unsolved in the production of eg fibers and filaments from polyesters at high winding speeds. It is known that when producing PET-POY (=preoriented yarn) at speeds above 4000 m / min, a marked increase in spinning crystallinity occurs due to higher spinning stresses. This leads to subsequent processing steps, especially in the deformation process, to a high number of wire breaks and capillary breaks as well as to a poor buckling force ( )value. In connection with POY production, reference modifications are often tau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183
CPCC08G63/199C08G63/189C08G63/183C08G63/181D01F6/84
Inventor F·埃芬贝尔格M·施威策尔F·赫尔曼努茨A·福里茨
Owner 德国登肯多夫纺织与纤维研究学院
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