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Preparation method for epoxy resin curing agent

An epoxy resin curing and environmental technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of urethane derivatives, etc., can solve the problems of toxic raw materials, high raw material prices, and high viscosity of curing agents, and achieve curing Moderate speed, simple process and mild reaction conditions

Inactive Publication Date: 2014-01-01
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some raw materials in the modification method currently used are toxic, and the price of some raw materials is too high, and the viscosity of the modified curing agent is relatively high, so there are still some shortcomings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The present embodiment provides a kind of preparation method of epoxy resin curing agent, comprises the following steps:

[0017] (1) Under the protection of dry nitrogen, put 2mol of isophoronediamine into a three-necked reaction flask, which is equipped with a reflux condenser, a thermometer and a stirrer.

[0018] (2) Heat the three-necked reaction flask in a water bath. When the temperature in the reaction flask rises to 40°C, add 1 mol of propylene carbonate dropwise at a rate of 50 mL per hour to the three-necked reaction flask for reaction.

[0019] (3) Add propylene carbonate dropwise for 30 minutes. After the dropwise addition, keep warm for 3 hours to obtain a clear and transparent light-colored epoxy curing agent.

Embodiment 2

[0021] The present embodiment provides a kind of preparation method of epoxy resin curing agent, comprises the following steps:

[0022] (1) Under the protection of dry nitrogen, put 1 mol of hexamethylenediamine into a three-necked reaction flask, which is equipped with a reflux condenser, a thermometer and a stirrer.

[0023] (2) Heat the three-necked reaction flask in a water bath. When the temperature in the reaction flask rises to 50°C, add 1 mol of propylene carbonate dropwise at a rate of 50 mL per hour to the three-necked reaction flask for reaction.

[0024] (3) Add propylene carbonate dropwise for 40 minutes. After the dropwise addition, keep warm for 2.5 hours to obtain a clear and transparent light yellow epoxy curing agent.

Embodiment 3

[0026] The present embodiment provides a kind of preparation method of epoxy resin curing agent, comprises the following steps:

[0027] (1) Under the protection of dry nitrogen, put 1mol of diethylenetriamine into a three-necked reaction flask, which is equipped with a reflux condenser, a thermometer and a stirrer.

[0028] (2) Heat the three-necked reaction flask in a water bath. When the temperature in the reaction flask rises to 45°C, add 1 mol of propylene carbonate dropwise at a rate of 50 mL per hour to the three-necked reaction flask for reaction.

[0029] (3) Add propylene carbonate dropwise for 35 minutes. After the dropwise addition, keep warm for 3.5 hours to obtain a clear and transparent light yellow epoxy curing agent.

[0030] The preparation method of the present invention has simple process, mild reaction conditions, non-toxic and easy-to-obtain raw materials, and moderate curing speed; the preparation method of the present invention uses propylene carbonate ...

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Abstract

The invention discloses a preparation method for an epoxy resin curing agent, and belongs to the technical field of curing agents. The preparation method comprises the following steps: (1) adding aliphatic polyamine or cycloaliphatic polyamine into a three-necked reaction flask; (2) performing water-bath heating on the three-necked reaction flask, and dropping propylene carbonate into the three-necked reaction flask for reaction when the temperature inside the three-necked reaction flask is 40-50 DEG C, wherein the molar ratio of aliphatic polyamine or cycloaliphatic polyamine to propylene carbonate is (1:1)-(2:1); (3) dropping propylene carbonate for 30-40 min, and preserving heat for 2.5-3.5 h when the dropping is completed, so that the epoxy resin curing agent is obtained. The method has a simple technology, the reaction condition is moderate, the material is non-toxic and easy to get, and the curing speed is moderate.

Description

technical field [0001] The invention belongs to the technical field of curing agents, and in particular relates to a preparation method of an epoxy resin curing agent. Background technique [0002] Epoxy resin has good mechanical properties, adhesive properties, electrical properties and corrosion resistance, and is widely used in adhesives, electrical insulation packaging, coatings and other fields. In the application of epoxy resin, the curing agent occupies a very important position. Common aliphatic and alicyclic polyamine curing agents have defects such as fast curing speed and brittleness in their cured products, and some curing agents are easy to crystallize at low temperatures. Therefore, at present, the amine curing agent is modified by various methods before application. However, some raw materials in the currently used modification method are toxic, and the price of some raw materials is too high, and the viscosity of the modified curing agent is relatively high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C269/04C07C271/20C07C271/36C07C271/38C08G59/54
Inventor 刘红姣
Owner JIANGHAN UNIVERSITY
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