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Solidifying agent for aqueous epoxy resin, and preparation method

A water-based epoxy resin and epoxy resin technology, applied in the field of curing agents, can solve problems such as self-polymerization, and achieve the effects of good compatibility, improved compatibility, and improved water resistance

Active Publication Date: 2007-05-09
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) The condensation reaction of epoxy resin and polyether glycol.

[0023] Put 43 grams of epoxy resin E-51 and 100 grams of polyethylene glycol 2000 into a four-necked flask protected by condensed water and nitrogen. The temperature of the flask was increased to 70°C, and the reaction materials were mixed thoroughly while stirring. Then 2.45 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 boiling the condensed water, and at the same time, the flow of the protective gas nitrogen should be increased to take away the heat and make it radiate. The temperature was controlled at about 95°C, and the reaction was stirred for 8 hours. Take a sample to determine the epoxy value.

[0024] (2) Addition modification of polyvinyl polyamine

[0025] Add 48.5 grams of triethylenetetramine into the above four-necked flask (at this time the flask should be cooled to...

Embodiment 2

[0045] (1) The condensation reaction of epoxy resin and polyether glycol.

[0046]In a four-necked flask with condensed water and nitrogen protection, 216 grams of epoxy resin E-51 and 250 grams of polyethylene glycol 1000 were put into it. The temperature of the flask is increased to 70°C, and the reaction materials are fully mixed evenly while stirring. Then 12.2 grams 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 boiling the condensed water, and at the same time, the flow of the protective gas nitrogen should be increased to take away the heat and make it dissipate. The temperature was controlled at about 100°C, and the reaction was stirred for 6 hours. Take a sample to determine the epoxy value.

[0047] In the condensate obtained above, another 216 grams of epoxy resin was added to the flask and stirred evenly. Cool down to room temperature.

[0048] (2) ...

Embodiment 3

[0069] (1) The condensation reaction of epoxy resin and polyether glycol

[0070] In a four-necked flask with condensed water and nitrogen protection, 20 grams of epoxy resin E-51 and 46.4 grams of polyethylene glycol PEG2000 were added. The temperature of the flask is increased to 70°C, and the reaction materials are fully mixed evenly while 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 boiling the condensed water, and at the same time, the flow of the protective gas nitrogen should be increased to take away the heat and make it dissipate. Control the temperature at about 90°C and stir for 8 hours. Take a sample to determine the epoxy value.

[0071] (2) Addition modification of aliphatic polyamines

[0072] Add 24.0 grams of triethylenetetramine into the four-necked flask above (the flask should first be cooled to about 50°C), stir fo...

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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 an aqueous epoxy resin curing agent and a preparation method thereof. Background technique [0002] Polyamine epoxy resin curing agents are divided into single polyamines and modified amines, of which single polyamines are further divided into four types: linear aliphatic amines, polyamides, alicyclic amines and aromatic amines. Straight-chain aliphatic polyamine has the characteristics of fast curing speed, excellent hue, high viscosity, high film hardness after curing, good gloss, good bonding performance, and excellent acid and alkali resistance. However, it also has its inherent shortcomings, such as high volatile irritation, high toxicity, short pot life, strict ratio requirements, etc.; it easily reacts with carbon dioxide in the air to form amine carbonate, which makes the paint film white and incomplete curing. In order to overcome these shortcomings, it must be further ...

Claims

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Application Information

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Patent Type & Authority Applications(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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