Environment friendly polyester polycondensation catalyst and method for preparing polyester by using the same

Abstract

The invention discloses an environment friendly polyester polycondensation catalyst and a method for preparing polyester by using the catalyst. The catalyst has a following structure, wherein, M represents doped metal ions, and X represents anions. The catalyst is prepared by the following steps: dissolving aluminium compound in glycol, adding an aqueous solution doped with metal salt at the temperature of 80-95 DEG C, stirring for 0.5-2 h at the temperature of 80-95 DEG C, then heating to 95-120 DEG C and stirring for 0.5-1 h, and finally adding stabilizing agent, phosphorous compound, and mixing uniformly. The stabilizing agent, phosphorous compound, and the aluminium compound can be separately added in the reaction system. The activity of the liquid aluminium catalyst is equal to that of the antimony catalyst, and the polyester hue of the liquid aluminium catalyst is equal to that of the antimony catalyst.

Description

technical field [0001] The invention belongs to the field of polyester, and in particular relates to an environment-friendly polyester polycondensation catalyst and its preparation method and application. Background technique [0002] Polyester (polyethylene terephthalate, referred to as PET), has excellent chemical and mechanical properties, is one of the most important synthetic fibers, and also has a wide range of applications in the fields of bottles, films and engineering plastics. application. [0003] Since the advent of polyester, research on polyester catalysts has never stopped. At present, there are mainly three series of catalysts in industrial production and research: Sb, Ge and Ti. Due to the good balance between the polymerization speed, polymer performance and polyester thermal degradation stability of Sb-based catalysts, more than 90% of the polymers Esters use Sb-based catalysts. However, since Sb is a heavy metal, it will inevitably cause adverse effect...

AI Technical Summary

Problems solved by technology

Ti-based catalysts were studied earlier, and inorganic titanium (potassium titanium oxalate, potassium fluorotitanate) and organic titanium (n-butyl titanate and isopropyl titanate) were used in the early stage. With the deepening of research, many have been developed in recent years. A variety of titanium series catalysts, such as the C94 of Acordis Company, the titanium catalysts of the brand EcocatB and EcocatT of Zimmer Company, the AC400 of ICI Synetix Company, AC300, AC240, etc., but all fail to solve the problem that the titanium catalyst polyester hue is yellower and thermal stability is poor shortcoming

[0005] Existing polyester polycondensation aluminum catalyst literature (such as CN00812597, JP2005054010) just described to be used as polyester catalyst jointly with certain aluminum compound or with aluminum compound and other metal compounds, there is no specific aluminum catalyst preparation method report, also does not involve Catalysts with various structures have unsatisfactory catalytic activity and catalytic speed

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