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Preparation method of novel Mannich water-based epoxy curing agent

A water-based epoxy and curing agent technology, used in epoxy resin coatings, coatings, etc., can solve the problems of short pot life, low coating film hardness and high water absorption of water-based epoxy systems, and achieve long pot life and coating film. High hardness, low volatility effect

Inactive Publication Date: 2013-07-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the shortcomings of poor compatibility between the existing curing agent and epoxy resin, short pot life of the water-based epoxy system, low hardness of the coating film, and high water absorption rate, the invention provides a preparation of a Mannich-type water-based epoxy curing agent method, can significantly improve the hardness and water resistance of the cured coating film

Method used

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  • Preparation method of novel Mannich water-based epoxy curing agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Mix 26.5g of 2,4,6-tris(dimethylaminomethyl)phenol with 64g of polyetheramine, stir and heat up to 70°C, and react for 8h to obtain Mannich modified amine A1.

[0020] The second step: under nitrogen blanketing conditions, put 60g polyethylene glycol 6000 and 3.8g E-51 into a four-necked flask equipped with a reflux condenser, a thermometer and a mechanical stirring device, stir, heat up, and heat the reactants When the temperature reaches about 60°C, the catalyst boron trifluoride diethyl ether is added, and the temperature is raised to 80°C, and the constant temperature reaction is maintained for 4 hours to obtain the terminal functional group epoxy prepolymer P.

[0021] Step 3: Add 2.5g of P and 15.5g of A1 into a three-necked flask, raise the temperature to 70°C, add 3.8g of E-51 into the reaction flask, and maintain a constant temperature for 3 hours. Then 4.5 g of phenyl glycidyl ether was added, and the temperature was raised to 80° C. for 2 h. The modi...

Embodiment 2

[0023] Step 1: Mix 26.5g of 2,4,6-tris(dimethylaminomethyl)phenol with 31g of diethylenetriamine, stir and heat up to 70°C, and react for 8h to obtain Mannich modified amine A1.

[0024] The second step: under nitrogen blanketing conditions, put 60g polyethylene glycol 6000 and 3.8g E-51 into a four-necked flask equipped with a reflux condenser, a thermometer and a mechanical stirring device, stir, heat up, and heat the reactants When the temperature reaches about 60°C, a catalyst, triphenylphosphine, is added, and the temperature is raised to 80°C, and the reaction is maintained at a constant temperature for 4 hours to obtain the terminal functional group epoxy prepolymer P.

[0025] Step 3: Add 5.5g of P and 15.5g of A1 into a three-necked flask, raise the temperature to 70°C, add 34g of E-51 into the reaction flask, and maintain a constant temperature for 3h. The modified Mannich amine A2 was obtained, the temperature was lowered, and the modified product A2 was emulsified ...

Embodiment 3

[0027] Step 1: Mix 26.5g of 2,4,6-tris(dimethylaminomethyl)phenol with 31g of diethylenetriamine, stir and heat up to 70°C, and react for 8h to obtain Mannich modified amine A1.

[0028] Step 2: Add 15.5g of A1 into a three-necked flask, raise the temperature to 70°C, add 2.85g of E-51 into the reaction flask, and maintain a constant temperature for 3h. The modified Mannich amine A2 was obtained, the temperature was lowered, and the modified product A2 was emulsified when the temperature was lowered to 50° C. to obtain the nonionic water-based epoxy curing agent emulsion M3.

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Abstract

The invention discloses a preparation method of a Mannich water-based epoxy curing agent. A water-based epoxy coating has the advantages of low VOC (Volatile Organic Compound) content, low odor, safety for using and the like, and is developed quickly in recent years. The curing agent serving as an important component of the water-based epoxy coating is one of key factors for deciding coating performance. The conventional prepared water-based epoxy curing agent has the defects of poor stability, short storage life of a water-based epoxy system after mixing, and poor water resistance and low hardness of a coating film. Meanwhile, amine with low molecular weight is volatilized easily and has high toxicity, so that the development of amine is limited. The invention provides a preparation method of a Mannich water-based epoxy curing agent. A cured coating film has the advantages of high hardness and high water resistance. The curing agent has wide application prospects in the fields of coatings, adhesives, concrete and the like.

Description

Technical field [0001] The invention belongs to the field of preparation and application of new materials, and relates to the preparation and application technology of water-based epoxy curing agent. Background technique [0002] The excellent performance of epoxy resin is widely used in coatings, ships, automobiles, buildings, civil engineering and other fields. However, at present, epoxy coatings are mainly solvent-based, which are toxic and have a pungent smell. Waterborne epoxy coatings have the advantages of low VOC content, low odor, and safe use. They have been developed rapidly in recent years, and their research and application have attracted increasing attention. Among them, the curing agent, one of the important components of waterborne epoxy coatings, is one of the key factors determining the performance of the coating. However, the currently prepared water-based epoxy curing agents have the disadvantages of poor stability, short pot life of the water-based epox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/62C08G59/50C09D163/00
Inventor 夏新年段颖熊远钦丁嘉欣
Owner HUNAN UNIV
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