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Aminoanilino zinc compound and its preparation method and application

A technology of aminoaniline and zinc compounds, which is applied in the field of catalysts for ring-opening polymerization of cyclic lactones. It can solve the problems of wide molecular weight distribution, low catalytic activity and uncontrollable molecular weight of polymers, and achieve less metal residues and high catalytic activity. , The effect of simple preparation method

Inactive Publication Date: 2016-02-17
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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  • Aminoanilino zinc compound and its preparation method and application
  • Aminoanilino zinc compound and its preparation method and application
  • Aminoanilino zinc compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take N, N-dimethylaminobenzaldehyde (8.8g, 59mmol) and dissolve it in 30ml of hexane, slowly add ethylenediamine (1.8g, 29.5mmol) dropwise, after the dropwise addition, the reaction is heated under reflux and stirred for 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

[0046] in N 2 Under the atmosphere, take the Schiff base (5.0g, 15.5mmol) of Example 1 and dissolve it in 30ml of dry diethyl ether, and slowly add lithium aluminum hydride (0.6g, 15.5mmol) in small amounts at 0°C. The reaction was slowly warmed to room temperature and stirred for 12 hours. After the reaction, slowly add 1.5mL of ice water to the reaction system to stop the reaction, then add 1.5mL of NaOH (3M) aqueous solution, 4.5mL of water, filter, wash the filter cake with 30ml of ethyl acetate, collect the filtrate, remove the solvent in vacuo to obtain a light yellow liquid A 5.3 g, yield 96%.

Embodiment 3

[0048] Take N,N-diethylaminobenzaldehyde (7.1g, 40mmol) and dissolve it in 40ml of ethanol, slowly add ethylenediamine (0.8g, 13.3mmol) dropwise, after the dropwise addition, the reaction is heated to 50°C and stirred 24 hours. After the reaction was completed, 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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Abstract

The invention discloses an aminoanilinozinc compound and its preparation method and application. Its structural formula is shown in the following formula I, wherein R1 and R2 are both C1-C4 linear or branched chain alkyl groups. The preparation method of the catalyst of the invention is simple, and the obtained catalyst has high catalytic activity, so it can be widely used to catalyze the ring-opening polymerization reaction of lactone and lactide. Due to the high activity of the catalytic system, the polymerization reaction can occur at a lower temperature, the conditions are mild, and the yield is high with less metal residue. In addition, the polymerization process is simple, and the usual solution polymerization method can be used, and the molecular weight of the polymer can be regulated through the control of the polymerization reaction conditions.

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 ac...

Claims

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Application Information

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Patent Type & Authority Patents(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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