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Catalyst system and application thereof in reaction for preparing aliphatic polyester

A catalyst and system technology, applied in the field of catalyst systems, can solve the problems of difficult preparation of molecular weight, low catalyst activity, long time, etc., and achieve the effects of simple operation process, stable reaction process and easy control.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the low activity of catalysts used in the preparation of aliphatic polyesters in the prior art, and the time required in the preparation process is longer, and it is difficult to prepare the defects of higher molecular weight aliphatic polyesters, A catalyst for the preparation of aliphatic polyesters is provided

Method used

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  • Catalyst system and application thereof in reaction for preparing aliphatic polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a 500mL three-necked flask equipped with a mechanical stirrer, a thermometer and a condenser tube, add 141.6g of 1,4-butanedioic acid (purchased from Anhui Sanxin Chemical Co., Ltd.), 119.0g of 1,4-butanediol (purchased From Tianjin Guangfu Fine Chemical Research Institute), tetra-n-butyl titanate (Ti(OBu) 4 , purchased from Beijing Chemical Reagent Company), and the equivalent Ti(OBu) 4 0.5 times the molar amount of aluminum phosphate AlPO 4 (purchased from Tianjin Guangfu Fine Chemical Research Institute), at normal pressure N 2Heating with constant power under protection until fractions evaporate, collect the distilled fractions, and switch the vacuum distillation device when the fractions are no longer distilled and the top temperature of the condenser tube drops significantly, decompress gradually and heat with constant power until 250°C Keep the temperature, react for a certain period of time under the vacuum condition of the system pressure 180Pa, until the ...

Embodiment 2

[0040] In a 500mL three-neck flask equipped with a mechanical stirrer, a thermometer and a condenser tube, add 141.6g of 1,4-butanedioic acid and 119.0g of 1,4-butanediol, equivalent to 1,4-butanedioic acid moles 0.3% tetraisopropyl titanate Ti(OPr) 4 , and equivalent to Ti(OPr) 4 2 times the molar amount of aluminum phosphite Al 2 (HPO 3 ) 3 (purchased from Tianjin Guangfu Fine Chemical Research Institute), at normal pressure N 2 Under protection, heat with constant power until fractions evaporate, collect the corresponding fractions, switch the vacuum distillation device when the fractions no longer evaporate and the temperature drop at the top of the condenser tube drops significantly, gradually reduce the pressure and heat with constant power until 250°C Keep the temperature, and react for a certain period of time under the vacuum condition of the system pressure 200Pa. When the viscosity of the product no longer increases significantly, the N 2 Return to normal press...

Embodiment 3

[0045] In a 500mL three-neck flask equipped with a mechanical stirrer, a thermometer and a condenser tube, add 141.6g of 1,4-butanedioic acid and 119.0g of 1,4-butanediol, equivalent to 1,4-butanedioic acid moles 0.3% tetra-n-propyl titanate, and aluminum monohydrogen phosphate Al equivalent to 5 times the molar amount of tetra-n-propyl titanate 2 (HPO 4 ) 3 , at atmospheric pressure N 2 Under protection, heat with constant power until fractions evaporate, collect the corresponding fractions, switch the vacuum distillation device when the fractions no longer evaporate and the temperature drop at the top of the condenser tube drops significantly, gradually reduce the pressure and heat with constant power until 250°C Keep the temperature, and react for a certain period of time under the vacuum condition of the system pressure 200Pa. When the viscosity of the product no longer increases significantly, the N 2 Return to normal pressure or pressurized discharge under protection ...

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Abstract

The invention discloses a catalyst system and application thereof in reaction for preparing an aliphatic polyester. The catalyst system comprises an organic metal chemical compound Cat-1 of which the general formula is Ti(OR)4, and a salt chemical compound Cat-2 of which the general formula is Alm(HxPOy)n, wherein R is alkyl of C3-C15, x is equal to 0,1 or 2, y is equal to 2, 3 or 4, m is equal to 1 or 2, n is equal to 1 or 3, and 3m+(x+5-2y)n is equal to 0. The catalyst system is applied to a polyester reaction for a fatty acid, so that the reacting time can be shortened, the evaporation of oligomerization by-products under a low vacuum state is reduced, and the reacting process is stable and is easy to control; the method can be realized under the condition that a single reactor works, so that the operating process is simple relatively; under the condition that an extender is not added, but the molecular weight of products is increased, aliphatic polyester products with a better stretching mechanical property can be obtained, and the obtained aliphatic polyester products can be completely biodegraded.

Description

technical field [0001] The invention relates to a catalyst system, in particular, the invention relates to a titanium / aluminum catalyst system and the application of the catalyst system in the reaction of preparing aliphatic polyester. Background technique [0002] Usually, aliphatic polyesters such as polybutylene succinate are prepared by condensation polymerization using aliphatic dicarboxylic acids and aliphatic diols as monomer raw materials. Because its structure contains a hydrophilic ester group, and its main chain is more flexible, it can be degraded into small molecule products such as carbon dioxide and water under the action of microorganisms, and its monomer raw materials can be replaced by bio-based, product performance and low density Polyethylene is close to it, and it can be used as a medical or environmentally friendly material. It is a kind of bioplastic with good performance. However, as a bioplastic, the use of catalysts in the preparation process also a...

Claims

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Application Information

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IPC IPC(8): C08G63/16C08G63/85
Inventor 祝桂香王洪涛张伟韩翎邹弋许宁计文希
Owner CHINA PETROLEUM & CHEM CORP
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