Method for preparing branching type water-based epoxy curing agent

A water-based epoxy and curing agent technology, applied in the field of epoxy resin curing agent, can solve the problems of high rheology, difficult to crystallize, and short pot life, and achieve high rheology, complete curing, and long pot life.

Inactive Publication Date: 2008-09-17
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waterborne epoxy curing agent is one of the key factors affecting the performance of two-component epoxy resin coatings. Although its preparation has been reported in the literature at home and abroad, most of them are linearly modified products of bisphenol A epoxy resin and polyamines. When the water-based epoxy resin component is used, it has the defects of high viscosity and short pot life
Compared with linear polymers, branched polymers exhibit a series of unique physical and chemical properties such as low viscosity, high rheology, and difficulty in crystallization that linear polymers do not have; while the preparation method of branched water-based epoxy curing agents is still unknown at home and abroad. No literature report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 0.3 moles of triethylenetetramine were dropped into a reaction flask containing 60 grams of propylene glycol methyl ether solution. The reaction bottle is equipped with a reflux condenser, a thermometer and a stirrer. When the temperature inside the reaction flask in the constant temperature water bath rose to 75°C, 0.1 mole of polyethylene glycol diglycidyl ether was added dropwise into the reaction flask at a constant speed to carry out the chain extension reaction, and the reaction was kept for 6 hours. Then, after the excess triethylenetetramine was removed by distillation under reduced pressure, 0.1 mole of octyl glycidyl ether was added dropwise at a constant speed into the reaction flask under the condition of 75° C. for reaction, and the reaction was kept for 6 hours. Then, under the condition of 75° C., the novolak epoxy resin F-51 solution containing 0.1 mole of epoxy groups was added dropwise to the aforementioned reaction device for branching reaction, and t...

Embodiment 2

[0024] 0.3 mol of diethylenetriamine was dropped into a reaction flask containing 60 g of propylene glycol methyl ether solution. The reaction bottle is equipped with a reflux condenser, a thermometer and a stirrer. When the temperature in the reaction flask in the constant temperature water bath rose to 70°C, 0.1 mole of polyethylene glycol diglycidyl ether was added dropwise into the reaction flask at a constant speed to carry out the chain extension reaction, and the reaction was kept for 6 hours. Then, after the excess diethylenetriamine was removed by distillation under reduced pressure, 0.1 mole of C10-12 chain glycidyl ether was added dropwise at a constant speed into the reaction flask under the condition of 75° C. for reaction, and the reaction was kept for 5 hours. Then, under the condition of 75° C., the novolak epoxy resin F-44 solution containing 0.1 mole of epoxy groups was added dropwise to the aforementioned reaction device for branching reaction, and the react...

Embodiment 3

[0026] Under the protection of dry nitrogen, 0.2 mole of m-xylylenediamine (MXDA) was put into a reaction flask containing 80 g of propylene glycol methyl ether solution. The reaction bottle is equipped with a reflux condenser, a thermometer and a stirrer. When the temperature in the reaction flask rose to 90° C., 0.1 mole of polyethylene glycol diglycidyl ether was added dropwise into the reaction flask at a uniform speed to carry out chain extension reaction, and the reaction was kept for 6 hours. Then, under the condition of 80° C., 0.1 mole of octyl glycidyl ether was added dropwise at a uniform speed into the reaction bottle for reaction, and the reaction was kept for 5 hours. Then, under the condition of 80° C., the novolac epoxy resin F-51 solution containing 0.1 mole of epoxy groups was added dropwise to the aforementioned reaction device for branching reaction, and the reaction was kept for 5 hours. After the reaction, the organic solvent was removed. At a temperatu...

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PUM

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Abstract

The invention discloses a branched waterborne epoxy curing agent and a preparation method thereof: monoepoxy compound is firstly used for carrying out the end-blocking reaction of one end of aliphatic polyamine or aromatic polyamine or the aliphatic polyamine or the aromatic polyamine which undergoes the chain extension by polyether alcohol diglycidyl ether or polyether epoxy resin, and primary amine hydrogen at the other end of the polyamine is simultaneously maintained. Then, novolac epoxy resin or novolac epoxy resin solution is dipped in the solution of the intermediate product of the reaction for carrying out the branching reaction; after that, distilled water solution of monoatomic organic acid is dripped in adduct after the branching for carrying out the salt forming dispersion reaction; and the branched waterborne epoxy curing agent is finally prepared. When in use of the branched waterborne epoxy curing agent of the invention and waterborne epoxy resin component, the branched waterborne epoxy curing agent has the advantages of low viscosity and long application period; and the cured product can overcome the shortcoming of brittle performance of the ordinary epoxy resin material on the premise of keeping good heat resistance.

Description

technical field [0001] The invention relates to an epoxy resin curing agent, in particular to a preparation method of a branched water-based epoxy curing agent. Background technique [0002] In the application of epoxy resin, the curing agent occupies a very important position. Although epoxy resin materials have the advantages of small shrinkage rate, excellent bonding performance, good mechanical properties, electrical properties and acid and alkali resistance, their cured products often have the defect of brittle performance; whether they are modified with rubber elastomer or thermoplastic resin Because of its brittleness, it is necessary to mix the epoxy resin and the modifier evenly, which undoubtedly brings some trouble and inconvenience to the molding process. It is superior to use a tough curing agent containing a flexible segment to toughen the epoxy resin material. At present, although there are a few reports of tough epoxy curing agents, most of them are solvent-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08L63/00
Inventor 周继亮张道洪张爱清李廷成
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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