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A kind of preparation method of epoxy curing agent

A technology of epoxy curing agent and catalyst, which is applied in the direction of epoxy resin coatings and coatings, and can solve the problems of short service life, poor performance, and low gloss of the coating film

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

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention proposes a preparation method of an epoxy curing agent, aiming to solve the problems of low gloss, poor performance and short service life of the existing epoxy resin coating film

Method used

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  • A kind of preparation method of epoxy curing agent
  • A kind of preparation method of epoxy curing agent

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preparation example Construction

[0017] The invention provides a preparation method of an epoxy curing agent. The method comprises the following steps: (1) Weighing an appropriate amount of epoxy resin, organic phenol and catalyst into a reaction vessel, heating to 75-250 DEG C for 0.5-7 hours After that, the temperature is lowered to 30-120° C. and part of the solvent is added to obtain the adduct of epoxy resin and organic phenol and then 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 phenols, it is beneficial to improve the flexibility and water resistance of the curing agent.

[0018] (2) in above-mentioned reaction vessel, add amine material and partial solvent and be warmed up to 40-125 ℃, slowly drip the adduct of epoxy resin and organic phenol obtained in step (1) under stirring state, at 70-125 ℃ Incubate at 135°C for 0.4-6 hours. Preferably, the heating temperature is 50-120° C., the heat p...

Embodiment 1

[0030] (1) Add 35 grams of E51 epoxy resin, 22 grams of cardanol, and 0.1 grams of N,N dimethylbenzylamine to the there-necked flask, heat up to 100°C for 2h, cool to 80°C and add 10 grams of glycidyl tertiary carbonate ether, and discharging after obtaining the adduct of epoxy resin and cardanol;

[0031] (2) 20 grams of diethylenetriamine were added to the there-necked flask, and 5 grams of ethylene glycol monobutyl ether were heated to 70° C., then the product synthesized in the step (1) was added dropwise, and the dripping was completed at 80° C. for 2h;

[0032] (3) Slowly add 8 grams of water and stir for 30 minutes to obtain epoxy curing agent.

Embodiment 2

[0034] (1) Add 20 grams of bisphenol F-type epoxy resin (NPEF170), 37 grams of petroleum phenol, 0.05 grams of N,N dimethylbenzylamine to the there-necked bottle, heat up to 90°C for 1 hour, cool to 40°C and add 15 g ethylene glycol monobutyl ether, and discharging after obtaining the adduct of epoxy resin and petroleum phenol;

[0035] (2) 20 grams of tetraethylene pentamine was added to the there-necked flask, and 60 grams of ethylene glycol monobutyl ether was heated to 50° C., and then the product synthesized in the step (1) was added dropwise, and the dripping was completed at 100° C. for 1 h;

[0036] (3) Slowly add 40 grams of glacial acetic acid and stir for 30 minutes to obtain epoxy curing agent.

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Abstract

The invention provides a preparation method of an epoxy curing agent. The preparation method comprises the following steps: (1) weighing a proper amount of epoxy resin, organic phenol and catalysts ina reaction vessel, heating to 75-250 DEG C, performing heat insulation for 0.5-7 hours, then cooling to 30-120 DEG C, adding a solvent, and discharging; (2) adding an amine substance and a part of solvents in the reaction vessel, heating to 40-125 DEG C, slowly dropwise adding the product obtained in the step (1) in the stirring state, and performing heat insulation for 0.4-6 hours at the temperature of 70-135 DEG C; and (3) slowly adding remaining solvents, and stirring for 5-100 minutes, thereby obtaining the epoxy curing agent. The compatibility of the epoxy curing agent modified from theorganic phenol and the epoxy resin is high, so that an obtained 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 hydrophobicityof 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 a preparation method of an epoxy curing agent. Background technique [0002] Waterborne epoxy resin has excellent corrosion resistance and medium resistance performance, and has been widely used in actual production. However, epoxy resin itself has poor flexibility and small molecular weight. It needs to be combined with a curing agent during use to prepare coatings with better resistance. membrane. Because the structure of epoxy resin and curing agent is quite different, 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 relatively large, the reaction speed with the curing agent is fast, the service life of the coating is short, and the application is very inconvenient. SUMMARY OF THE INVENTION [0003] In view of this, the present invention proposes a pr...

Claims

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Application Information

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IPC IPC(8): C08G59/62C08G59/14C09D163/00
CPCC08G59/1438C08G59/62C09D163/00
Inventor 程建军秦文
Owner BEIJING JINHWEILI APPLIED CHEM PROD
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