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Method for preparing polyester polyol by taking waste polyester bottles as main raw materials

A polyester polyol, the main raw material technology, applied in the field of preparation of polyester polyol and high molecular polymer, can solve the problem of single, residue multi-product structure, etc., to reduce production cost, convenient and effective end point of alcoholysis , The effect of stable product quality

Active Publication Date: 2013-04-24
华大化学(安徽)有限公司
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  • Description
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the many residues that exist in the method for preparing polyester polyols with reclaimed polyester bottles as the main raw material in the prior art and the problem of single product structure, provide a method for preparing polyester polyols with waste polyester bottles as the main raw material, and use thin-layer chromatography to conveniently and effectively control the end point of alcoholysis

Method used

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  • Method for preparing polyester polyol by taking waste polyester bottles as main raw materials
  • Method for preparing polyester polyol by taking waste polyester bottles as main raw materials

Examples

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Embodiment 1

[0028] (1) Control of alcoholysis endpoint and preparation of alcoholyzate

[0029] Add 1,000 grams of clean polyester bottle fragments, 220 grams of ethylene glycol, 300 grams of tris(α-hydroxyethyl) isocyanurate, and 12 grams of lithium sulfate into the reaction bottle, under the condition of 195±5°C Alcoholysis was carried out for 6 hours, and the end point of the alcoholysis reaction was measured by thin-layer chromatography. The endpoint control method is: dissolving polyester bottle fragments in a mixed solvent with a mass ratio of tetrahydrofuran and dimethylformamide of 1:1 to prepare a reference sample, and extracting the alcoholysis mixture at regular intervals during the alcoholysis process The samples to be tested were prepared in a mixed solvent with a mass ratio of tetrahydrofuran and dimethylformamide of 1:1. Dip the above-mentioned reference sample and the sample to be tested respectively with a capillary tube, and place them on both sides of the bottom ed...

Embodiment 2

[0035] (1) Control of alcoholysis endpoint and preparation of alcoholyzate

[0036] Put 1000 grams of clean polyester bottle fragments, 220 grams of ethylene glycol, 300 grams of sorbitol, and 12 grams of lithium sulfate into the reaction bottle, and alcoholyze it at 200 ° C for 5 hours, and measure it by thin layer chromatography The alcoholysis reaction reaches the end point. End point control method is the same as implementation example 1.

[0037] (2) Polycondensation of alcoholyzate and preparation of polyester polyol

[0038] In the alcoholyzate prepared in step 1, add ethylene glycol agent xylene, polycondensation catalyst antimony trioxide 12 grams, at 200 ° C, polycondensate for 2.0 hours, the polycondensation degree of alcoholyzate reaches the requirement, and then negatively Xylene was sucked under pressure for 15 minutes to obtain polyester polyol. The technical indicators of the prepared polyester polyol are: hydroxyl value 230±5 mgKOH / g, number average...

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Abstract

The invention provides a method for preparing polyester polyol by taking waste polyester bottles as main raw materials, comprising the step of introducing the polyols of tri(alpha-hydroxyethyl) isocyanurate, triethanolamine, sorbitol and the like and performing alcoholysis on waste polyester to prepare polyester polyol, wherein a new way for recycling polyester bottle waste materials is developed, and the reaction endpoint of the alcoholysis can be conveniently and effectively controlled by adopting a thin-layer chromatography method. The polyester polyol prepared by the method disclosed by the invention has a hydroxyl value of 150-310 mgKOH / g, a number-average molecular weight of 5000-7000 (which is measured by a gel permeation chromatography method, and with a mobile phase of tetrahydrofuran), and a molecular weight distribution index of 1.7-2.5; and the production cost is 65-80% of the production cost of the existing similar products.

Description

technical field [0001] The invention relates to the technical field of organic chemistry, in particular to a method for preparing high molecular polymers, in particular to a method for preparing polyester polyols with waste polyester bottles as the main raw material. Background technique [0002] Polyester is a thermoplastic polymer material with the structure of polyethylene terephthalate. Because of its many excellent properties and good processability, it is widely used in the manufacture of chemical fibers, polyester bottles, polyester films, engineering plastics, plastic containers, packaging materials and other products. According to the survey, the global annual demand for various polyester materials reaches more than 80 million tons, and continues to increase at a rate of 10% year by year. Among them, the demand for polyester for bottles is about 30 million tons, with an annual growth rate of more than 20%. my country is one of the largest demand countries for poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/20C08G63/86
Inventor 左晓兵袁建思潘丹童娟徐秀朱亚辉
Owner 华大化学(安徽)有限公司
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