Method for synthesizing polyester by using rare earth catalyst

A catalyst and polyester technology, applied in the field of synthetic polyester, can solve the problems of wide molecular weight distribution of polymer products, further research on process catalysts, complicated operation process, etc., and achieve the advantages of increased polymerization reaction speed, easy control and simplified operation process. Effect

Active Publication Date: 2009-02-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of rare earth compounds as polyester catalysts can increase the polymerization rate, the specific process and catalyst selection need further research
In the technology of polyester synthesis, there are still deficiencies such as complex operation process and wide molecular weight distribution of polymerization products.

Method used

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  • Method for synthesizing polyester by using rare earth catalyst

Examples

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Comparison scheme
Effect test

Embodiment 1-4

[0050] Embodiment 1-4 Preparation of Rare Earth Catalyst C2

Embodiment 1

[0051] Example 1 Anhydrous lanthanum chloride (LaCl 3 ) preparation

[0052] 10g La 2 o 3 Dissolve with excess hydrochloric acid, add metered NH after heating and concentrating 4 Cl(with La 2 o 3 The molar ratio is 3 / 1,), and the excess acid is evaporated by careful heating to obtain LaCl 3 ·nH 2 O+NH 4 For the solid of Cl, grind the solid and add it to the quartz sublimation tube, vacuumize to <5mmHg; slowly heat up to 400°C in the tube furnace, and keep the vacuum for 1hr; cool to room temperature under vacuum, fill with argon, Remove the sublimation tube and transfer it into the tube under the protection of argon for standby.

Embodiment 2

[0053] Example 2 Lanthanum acetylacetonate La(a c a c ) 3 preparation of

[0054] In a 250ml three-necked bottle, LaCl 3 ·7H 2 O (3.47g, 9.37mmol) was dissolved in 50ml of water, added dropwise to 50ml of aqueous solution of acetylacetone (5.63g, 56.2mmol), stirred at room temperature, and adjusted to pH 7 by adding 2NKOH solution. The reaction mixture carries La(a c a c ) 3 The precipitate was stirred, filtered, and vacuum-dried at 60°C to obtain about 4g La(a c a c ) 3 .

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Abstract

This invention publishes a synthesis method for polyesters from rare earth catalysts. In this method, single-kettle operation is adopted. One of the compounds of titanium, stibium and zincum is chosen as the catalyst C1 for transesterification and esterification and is added into the reaction kettle with monomer raw materials before reaction. After a certain period of prepolymerization, a rare earth metal compound as catalyst C2 is added for vacuum condensation polymerization. It is due to the single-kettle operation that this invention has the advantages of simplified technique, accelerated polymerization reaction, promoted product molecular weight, reduced side reactions and significantly improved color of polyester product.

Description

technical field [0001] The invention relates to a method for synthesizing polyester, in particular to a method for synthesizing polyester using a rare earth compound as a catalyst component. Background technique [0002] Condensation polymerization to prepare polyester, such as polyethylene terephthalate PET, polybutylene terephthalate PBT, polytrimethylene terephthalate PPT, etc., have been widely used in people's daily life as engineering materials In various fields, they can be made into fibers, beverage bottles, films and other materials. These polymers are prepared through two processes: esterification or transesterification of terephthalic acid or its esterified products with aliphatic dihydric alcohols. The esterification process occurs under high pressure conditions, and the transesterification process occurs at normal pressure Carried out under; vacuum polycondensation of esterification or transesterification products. These two processes are generally carried out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/181C08G63/84C08G63/85
Inventor 陈伟祝桂香陈锡荣张伟闫一凡张艳霞吕静兰
Owner CHINA PETROLEUM & CHEM CORP
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