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Solidifying agent for aqueous epoxy resin, and preparation method thereof

A water-based epoxy resin and epoxy resin technology, applied in the field of curing agent, can solve problems such as self-polymerization, achieve good compatibility, improve compatibility, and eliminate volatile odors

Active Publication Date: 2009-04-22
佛山市桐立新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

α-methacrylic acid is prone to self-polymerization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Condensation reaction of epoxy resin and polyether diol.

[0023] In a four-neck flask with condensed water and nitrogen protection, put 43 grams of epoxy resin E-51 and 100 grams of polyethylene glycol 2000 into it. The temperature of the flask was raised to 70°C, and the reaction materials were fully mixed evenly under stirring. Then add 2.45 grams of zinc chloride as a catalyst. In the initial stage of the reaction, a large amount of reaction heat will be released. At this time, attention should be paid to opening the condensed water, and at the same time, the flow rate of the protective gas nitrogen should be increased to take away the heat and make it fully dissipate. The temperature was controlled at about 95°C, and the reaction was stirred for 8 hours. Samples were taken to determine the epoxy value.

[0024] (2) Addition modification to polyethylene polyamine

[0025] Add 48.5 grams of triethylenetetramine to the above four-necked flask (the flask should...

Embodiment 2

[0045] (1) Condensation reaction of epoxy resin and polyether diol.

[0046] In a four-neck flask with condensed water and nitrogen protection, epoxy resin E-51 was dropped in 216 grams and polyethylene glycol 1000 in an amount of 250 g. The temperature of the flask was raised to 70°C, and the reaction materials were fully mixed evenly under stirring. Then 12.2 g of zinc oxide was added as a catalyst. In the initial stage of the reaction, a large amount of reaction heat will be released. At this time, attention should be paid to opening the condensed water, and at the same time, the flow rate of the protective gas nitrogen should be increased to take away the heat and make it fully dissipate. The temperature was controlled at about 100°C, and the reaction was stirred for 6 hours. Samples were taken to determine the epoxy value.

[0047] In the condensate obtained above, add 216 grams of epoxy resin into the flask and stir evenly. Cool to room temperature.

[0048] (2) cappi...

Embodiment 3

[0069] (1) Condensation reaction of epoxy resin and polyether diol

[0070] In a four-neck flask with condensed water and nitrogen protection, add 20 grams of epoxy resin E-51 and 46.4 grams of polyethylene glycol PEG2000. The temperature of the flask was raised to 70°C, and the reaction materials were fully mixed evenly under stirring. Then 1.3 g of zinc chloride was added as a catalyst. In the initial stage of the reaction, a large amount of reaction heat will be released. At this time, attention should be paid to opening the condensed water, and at the same time, the flow rate of the protective gas nitrogen should be increased to take away the heat and make it fully dissipate. Control the temperature at about 90°C and stir for 8 hours. Samples were taken to determine the epoxy value.

[0071] (2) Addition modification of aliphatic polyamines

[0072] Add 24.0 grams of triethylenetetramine into the above four-necked flask (at this time, the flask should be cooled to abou...

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PUM

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Abstract

This invention discloses a method for preparing waterborne epoxy resin curing agent. The method comprises: condensing epoxy resin and polyester diol, performing addition modification on polyethylene polyamine, mixing with acrylonitrile at nitril / amine H mol ratio of (1.1-1.2):1.0, reacting at 65-70 deg.C for 1.5-2.0 h for end-capping, and salifying. The obtained waterborne epoxy resin curing agent has a solid content of 45-50%, an amine value of 290-500, and a viscosity of 8.0-14 ps. The curing agent has a moderate amine equivalent, and can emulsify and cure low molecular weight epoxy resin at room temperature. Besides, the curing agent has no toxicity, no harm, no volatile organic solvent, and largely reduced stimulation of modified amine to skin.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to a water-based epoxy resin curing agent and a preparation method thereof. Background technique [0002] Polyamine epoxy resin curing agents are divided into two types: single polyamine and modified amine, and single polyamine is divided into four types: straight chain aliphatic amine, polyamide, alicyclic amine and aromatic amine. Linear fatty polyamine has the characteristics of fast curing speed, excellent hue, high viscosity, high hardness of cured paint film, good gloss, good adhesion performance, excellent acid and alkali resistance, etc. But there are also inherent shortcomings, such as high volatility, high toxicity, short pot life, strict ratio requirements, etc.; it is easy to react with carbon dioxide in the air to form amine carbonate, which makes the paint film white and incompletely cured. In order to overcome these shortcomings, it must be further modified to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/40C08G81/00C08G59/14C08G59/50C08L63/00
Inventor 任碧野潘国鹏刘新星童真
Owner 佛山市桐立新材料科技有限公司
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