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Process for preparing polyester and copolyester

A technology of copolyester and polyester, which is applied in the field of catalyst preparation, can solve problems such as difficult dissolution, product quality fluctuation, and unevenness, and achieve the effects of improving catalytic activity and selectivity, improving quality, and reducing b value

Inactive Publication Date: 2009-08-26
SHANGHAI HUAMING HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Titanium catalysts, except titanium alkoxide, are usually not easily soluble in ethylene glycol, but titanium alkoxide is not suitable as a polycondensation catalyst for polyester synthesis because it is easily hydrolyzed.
[0008] Because the solubility of most titanium catalysts in ethylene glycol is relatively small, usually only a suspension can be formed, which will lead to two problems: one is that the catalyst is easy to agglomerate, and the mixing with the reactants is not uniform enough, which easily leads to fluctuations in product quality The second is that due to heterogeneous catalysis, the surface mass transfer process of titanium catalysts is complicated, which easily leads to poor product hue
Although these catalysts solve the problem of inhomogeneous addition of titanium catalysts to the reaction system to a certain extent, they inevitably introduce impurities into the reaction system during the use of the catalysts.

Method used

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  • Process for preparing polyester and copolyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare titanium silicon catalyst according to the method disclosed in patent CN1415643A:

[0028] Dissolve 50 g of tetrabutyl titanate and 2 g of ethyl orthosilicate in 150 ml of absolute ethanol (solution A). 30 g of deionized water and 5 ml of phosphoric acid (15 mol / l) were dissolved in 150 ml of absolute ethanol (solution B). With uniform stirring, B was added dropwise to A to produce a white precipitate. The mixture was stirred for 3 hours, centrifuged, and the precipitate was washed with ethylene glycol to obtain a white slurry-like titanium-silicon catalyst containing ethylene glycol.

Embodiment 2

[0030] Add the titanium-silicon catalyst in the form of white slurry containing ethylene glycol obtained in Example 1 into 250ml of ethylene glycol, reflux at 190°C for 2 hours, the catalyst is completely dispersed and dissolved, and the catalyst solution A is obtained. The pH value of A is about 5.0, and the titanium The active ingredient content of the silicon catalyst is 1.0%. Placed in the air for 90 days, the solution is still clear without turbidity.

Embodiment 3

[0032] Heat 250ml of ethylene glycol to 170°C, add the white slurry-like titanium-silicon catalyst containing ethylene glycol obtained in Example 1, the catalyst gradually dissolves, and the dissolved catalyst solution is kept warm for 2 hours to obtain catalyst solution B, titanium-silicon The active ingredient content of the catalyst is 1.0%. B was placed in the air for 90 days, the solution was still clear and no precipitation occurred.

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Abstract

The process of preparing polyester and copolymer includes the following steps: 1. the ester interchange reaction of dicarboxylic ester or the reaction of dicarboxylic acid with diol to obtain ester oligomer mixture; and 2. the further polycondensation in the presence of polycondensation catalyst. It features the polycondensation catalyst comprising homogeneous diol solution of Ti-Si catalyst. The homogeneous catalytic reaction has simple mass transfer process, raised mass transfer efficiency, raised catalyst activity and selectivity, raised polyester product quality, lowered product b value and shortened polycondensation time.

Description

technical field [0001] The invention relates to a method for preparing polyester and copolyester, in particular to a method for preparing and using a catalyst used in the polycondensation process. Background technique [0002] As a polymer compound, polyester and copolyester are widely used in light industry, machinery, electronics, packaging and other fields. The polyesters and copolyesters involved in the present invention are macromolecular compounds with the following structural segments: (taking polyester as an example) [0003] [0004] Among them: m=2, 3 or 4, n is the degree of polymerization, n=50-70, and its molecular weight is 10000-15000; copolyester is a component added during polyester polymerization to improve the performance of polyester, Such as isophthalic acid and its derivatives, polyethylene glycol, polytetramethylene glycol, etc. [0005] The catalysts currently used in the preparation of polyester mainly include Sb, Ge and Ti catalysts. Sb cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/46C08G63/78C08G63/85
Inventor 孔凡滔马新胜吴秋芳李福清杨景辉陈刚董启华马瑞
Owner SHANGHAI HUAMING HI TECH GRP
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