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Method for preparing aqueous epoxy resin hardener

A technology of water-based epoxy resin and epoxy resin, which is applied in the field of curing agent, can solve the problems of easy gelation, low impact strength, and difficult operation control, etc., and achieve the effect of improving water solubility, overcoming poor flexibility, and good curing performance

Inactive Publication Date: 2008-03-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction between polyamine and epoxy resin is an exothermic reaction, the temperature is not easy to control, and gel phenomenon is easy to occur, and the operation is not easy to control
At the same time, the epoxy-polyamine adduct curing agent has the disadvantages of poor flexibility and low impact strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Synthesis of modified epoxy: add 67g (0.134mol hydroxyl) polyethylene glycol-1000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, and add 1.6 g boron trifluoride diethyl ether, then add 39.8g (0.175mol epoxy group) epoxy E-44 (epoxy value 0.44mol / 100g) in batches, stir and heat up to 80°C, and control the temperature for 7 hours. , discharge, and cool at room temperature to obtain a liquid product.

[0023] b. Synthesis of modified polyamine: Add 33.5g (0.319mol) of diethylenetriamine into a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, and add a dropwise at a constant temperature of 60°C Step product, reacted for 5 hours. Then carry out vacuum distillation to distill off the excess polyamine to obtain the addition product. The product is light yellow liquid with relatively high viscosity.

[0024] c. End capping: 15.1 g (0.076 mol epoxy) butyl gl...

Embodiment 2

[0035] a. Synthesis of modified epoxy: first add 34.85g (0.017mol) polyethylene glycol-4000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, and add 0.205g dropwise at 60°C Boron trifluoride ether, then add 8.2g (0.042mol) epoxy resin E-51 (epoxy value 0.51mol / 100g) in batches, stir and heat up to 110°C, and control the temperature for 6 hours, the reaction is complete After cooling to 50° C., add 18 g (0.092 mol) of epoxy resin with a molecular weight of 18 g (0.092 mol) and stir evenly to discharge the material, and cool at room temperature to obtain a liquid product.

[0036] b. Modified polyamine synthesis: add 53.1g of diethylenetriamine to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, and add the product of step a dropwise at a constant temperature of 70°C, and react 4 hours. Then carry out vacuum distillation to distill off the excess polyamine to obt...

Embodiment 3

[0048] a. Synthesis of modified epoxy: first add 60g (0.02mol hydroxyl) polyethylene glycol-6000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, and add 0.35g dropwise at 60°C. Boron trifluoride ether, then add 35g (0.07mol epoxy group) epoxy resin E-20 (epoxy value 0.20mol / 100g) in batches, stir and heat up to 95 ° C, and control the temperature for 7 hours, After the reaction is completed, cool to 50° C., add 36 g (0.184 mol epoxy group) of low molecular weight epoxy resin, stir evenly and discharge, and cool at room temperature to obtain a liquid product.

[0049] b. Synthesis of modified polyamine: Add 55g of diethylenetriamine to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, and add the product of step a dropwise at a constant temperature of 80°C, and react 3 Hour. Then carry out vacuum distillation to distill off the excess polyamine to obtain the add...

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PUM

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Abstract

The present invention is process of preparing water soluble epoxy resin curing agent. The preparation process includes the following steps: 1. ring-opening reaction of polyethylene glycol and bisphenol A type epoxy resin under the action of catalyst to produce modified epoxy resin with epoxy groups in two ends; 2. dropping the modified epoxy resin into polyethylene polyamine to produce end amino-epoxy addition compound; 3. dropping compound 501 into the addition compound to produce end capping product; and 4. dropping organic acid into the end capping product to form salt and adding certain amount of water to produce the water soluble epoxy resin curing agent. The synthesized curing agent has high water solubility, capacity of well controlling reaction with polybasic amine and high flexibility.

Description

technical field [0001] The invention belongs to the technical field of curing agents, and in particular relates to a preparation method of a water-based epoxy resin curing agent. Background technique [0002] The excellent comprehensive performance of epoxy coatings makes it widely used in anti-corrosion coatings, industrial floor coatings, architectural coatings and other fields. However, epoxy coatings are harmful to the ecological environment because they contain a large amount of organic solvents. Water-based epoxy coatings are one of the main trends in their development. Curing agent is one of the key factors affecting the performance of epoxy coatings. Ordinary aliphatic amine room temperature curing agents are more irritating to the human body, and are easy to react with carbon dioxide in the air to form salts, or absorb moisture and become white. Therefore, most of the water-based epoxy curing agents actually used are their modified products, including amidated poly...

Claims

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Application Information

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IPC IPC(8): C08G59/40C08G59/14
Inventor 刘晓非包哈森陈强宋涛
Owner TIANJIN UNIV
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