an epoxy curing agent

A technology of epoxy curing agent and catalyst, used in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of short service life, poor performance, low gloss of coating film, etc., to improve corrosion resistance and flexibility. and hydrophobicity, high gloss effect

Active Publication Date: 2020-10-30
BEIJING JINHWEILI APPLIED CHEM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention proposes an epoxy curing agent, aiming at solving the problems of low luster, poor performance and short service life of existing epoxy resin coating films

Method used

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  • an epoxy curing agent

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preparation example Construction

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

[0022] (1) Weigh the epoxy resin, organic phenol and catalyst in the formula into the reaction vessel, heat it to 75-250°C and keep it warm for 0.5-7 hours, then cool it down to 30-120°C and add 1-75 parts of solvent to obtain the ring The adduct of oxygen resin and organic phenol is discharged. Preferably, the heating temperature is 90-200°C, the holding time is 1-5 hours, and the cooling temperature is 40-100°C. By introducing organic phenolic substances, it is beneficial to improve the flexibility and water resistance of the curing agent.

[0023] (2) Add the amine substances in the formula and 1-60 parts of solvent to the above-mentioned reaction vessel and heat up to 40-125°C, slowly add the addition of epoxy resin and organic phenol obtained in step (1) under stirring objects, at 70-135°C for 0.4-6 hours. Preferably, the heating t...

Embodiment 1

[0028] (1) Add 35 grams of E51 epoxy resin, 22 grams of cardanol, and 0.1 grams of N,N dimethylbenzylamine into the three-necked bottle, raise the temperature to 100°C and keep it for 2 hours, then cool down to 80°C and add 10 grams of glycidol tertiary acid Ether, discharge after obtaining the adduct of epoxy resin and cardanol;

[0029] (2) Add 20 grams of diethylenetriamine and 5 grams of ethylene glycol monobutyl ether to the three-necked flask and heat it to 70°C, then add the product synthesized in step (1) dropwise, and keep the temperature at 80°C for 2 hours after the dropwise addition;

[0030] (3) Slowly add 8 grams of water and stir for 30 minutes to obtain the epoxy curing agent.

Embodiment 2

[0032] (1) Add 20 grams of bisphenol F-type epoxy resin (NPEF170), 37 grams of petroleum phenol, 0.05 grams of N,N dimethylbenzylamine into the three-necked bottle, heat up to 90 ° C for 1 hour, cool down to 40 ° C and add 15 Gram ethylene glycol monobutyl ether, after obtaining the adduct of epoxy resin and petroleum phenol, discharge;

[0033] (2) Add 20 grams of tetraethylenepentamine and 60 grams of ethylene glycol monobutyl ether into the three-necked flask and heat it to 50°C, then add the product synthesized in step (1) dropwise, and keep the temperature at 100°C for 1 hour after the dropwise addition;

[0034] (3) Slowly add 40 grams of glacial acetic acid and stir for 30 minutes to obtain an epoxy curing agent.

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Abstract

The invention provides an epoxy curing agent which comprises the following components in parts by weight in the synthetic formula: 10-80 parts of epoxy resin, 5-70 parts of organic phenol, 0.005-9 parts of a catalyst, 5-60 parts of an amine substances, and 1-150 parts of a solvent. The compatibility of the epoxy curing agent modified from the organic phenol and the epoxy resin is high, so that anobtained film is relatively high in glossiness, and moreover,a high-molecular-weight body conformation is formed after the epoxy curing agent reacts with the epoxy resin, so that the corrosion resistance and the medium resistance of the film are improved. Besides, the organic phenol is introduced, so that the flexibility and the hydrophobicity of the film are improved, the reaction speed of the epoxy resin and the epoxy curing agent is controlled, and the open time is prolonged.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to an epoxy curing agent. Background technique [0002] Water-based epoxy resin has excellent corrosion resistance and medium resistance, and has been widely used in actual production. However, epoxy resin itself has poor flexibility and small molecular weight. It needs to be used with a curing agent to prepare a coating with better resistance. membrane. Because the structure difference between epoxy resin and curing agent is relatively large, problems such as low gloss and poor performance of the coating film often occur during the application process. In addition, the activity of the epoxy group is high, the reaction speed with the curing agent is fast, the service life of the coating is short, and the application is very inconvenient. Contents of the invention [0003] In view of this, the present invention proposes an epoxy curing agent, which aims to solve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/62C09D163/00C09D5/08
CPCC08G59/623C09D5/08C09D163/00
Inventor 程建军秦文
Owner BEIJING JINHWEILI APPLIED CHEM PROD
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