Amido aniline group zinc compound and preparation method and application thereof

An aminoaniline, zinc compound technology is applied in the field of catalysts for ring-opening polymerization of cyclic lactones, can solve the problems of low catalytic activity, uncontrollable molecular weight, wide molecular weight distribution of polymers, etc., and achieves high catalytic activity and simple preparation method. , the effect of less metal residue

Inactive Publication Date: 2013-02-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalysts used in the prior art, such as stannous octoate, have low catalytic activity, and the molecular weight distribution of the obtained polymer is wide, and the molecular weight is uncontrollable

Method used

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  • Amido aniline group zinc compound and preparation method and application thereof
  • Amido aniline group zinc compound and preparation method and application thereof
  • Amido aniline group zinc compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take N, N-dimethylaminobenzaldehyde (8.8 g, 59 mmol) and dissolve it in 30 ml of hexane, slowly add ethylenediamine (1.8 g, 29.5 mmol) dropwise, after the dropwise addition, the reaction is heated under reflux and stirred 12 hours. After cooling and crystallization, 7.2 g of yellow powder Schiff's base was obtained by filtration, with a yield of 76%.

Embodiment 2

[0047] in N 2 Under the atmosphere, take the Schiff base (5.0 g, 15.5 mmol) of Example 1 and dissolve it in 30 ml of dry diethyl ether, slowly add lithium aluminum hydride (0.6 g, 15.5 mmol) in small amounts at 0 °C, and add The reaction was then slowly raised to room temperature and stirred for 12 hours. After the reaction, slowly add 1.5 mL of ice water to the reaction system to stop the reaction, then add 1.5 mL of NaOH (3M) aqueous solution, 4.5 mL of water, filter, wash the filter cake with 30 ml of ethyl acetate, collect the filtrate, and remove the solvent in vacuo to obtain light yellow liquid A 5.3 g, 96% yield.

Embodiment 3

[0049] Dissolve N,N-diethylaminobenzaldehyde (7.1 g, 40 mmol) in 40 ml of ethanol, slowly add ethylenediamine (0.8 g, 13.3 mmol) dropwise, and heat the reaction to 50°C after the dropwise addition , stirred for 24 hours. After the reaction, the solution was concentrated, 10 mL of hexane was added to cool and crystallize, and 3.6 g of yellow powder Schiff base was obtained by filtration, with a yield of 71%.

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PUM

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Abstract

The invention discloses an amido aniline group zinc compound and a preparation method and an application thereof. The structural formula is as the following formula I, and R1, R2 in the formula are both C1-C4 linear chain or branched chain structured alkyl. The method for preparing a catalyst is simple, and the obtained catalyst is high in catalyst activity, so that the catalyst can be widely used for catalyzing ring-opening polymerization of lactone and lactide. The activity of a catalyst system is high, the polymerization can be carried out under low temperature, the condition is mild, the yield is high, and metal residue is small. Additionally, the polymerization is simple in process, and the molecular weight of polymers can be controlled and adjusted by controlling conditions of the polymerization through a general solution polymerization process.

Description

technical field [0001] The invention relates to a catalyst for ring-opening polymerization of cyclic lactones, in particular to a class of zinc aminoaniline catalysts, a preparation method thereof and an application as a catalyst for ring-opening polymerization of cyclic lactones. Background technique [0002] While traditional polymer materials such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride bring convenience to people's lives, their use of waste causes a large amount of permanent "white pollution" garbage, which has caused huge damage to the ecological environment. The pressure has caused certain harm to people's production and life. Seeking alternative environmentally friendly biodegradable polymer materials has become a research hotspot in the field of materials worldwide, providing an effective means to solve this problem. [0003] Aliphatic polyesters are an important class of biodegradable polymer materials. They can generate hydroxy fatty a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F3/06C08G63/08C08G63/83
Inventor 姚伟薛颖朝高爱红刘甜甜高洪远张巧娜李浩生王岩王增龙崔宁
Owner UNIV OF JINAN
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