Preparation method of non-ionic room temperature-cured aqueous epoxy curing agent

A room temperature curing, water-based epoxy technology, applied in the field of epoxy resin curing agent, can solve the problems of complex preparation process, pH value sensitivity, coating film performance decline, etc., achieve simple preparation process, mild reaction conditions, and improve compatibility Effect

Inactive Publication Date: 2007-08-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of organic acids may cause flash rust when used on metals, resulting in a decrease in coating performance; in addition, cationic water-based epoxy curing agents that are salted with organic acids are more sensitive to pH. When in use, prone to instability
US5567748, US6277928, US6653369 and other patented technologies involve related non-ionic water-based epoxy curing agents, but their preparation process is very complicated, the cost is high, and it is difficult to industrialize

Method used

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  • Preparation method of non-ionic room temperature-cured aqueous epoxy curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Under the protection of dry nitrogen, 0.6 mol of triethylenetetramine was put into a 1000 mL four-necked reaction flask filled with 110 mL of propylene glycol methyl ether solution. The four-necked reaction flask is equipped with a reflux condenser, a thermometer and a stirrer. The stirring paddle type is an anchor impeller stirring paddle, the stirring speed is about 500rm-1, and the heating form is a water bath constant temperature. When the temperature in the reaction bottle rises to 65°C, add 0.2 moles of polyether polyol diglycidyl ether (NPER-032) dropwise at a rate of 60 mL per hour to the reaction bottle for reaction, and then keep it warm for 2 hours after the dropwise addition about.

[0023] After the excess triethylenetetramine was removed by distillation under reduced pressure, in the aforementioned reaction device, when the temperature in the reaction bottle was 65°C, 0.1 mole of liquid epoxy resin EPON828 was added dropwise at a rate of 60 mL per hour to...

Embodiment 2

[0026] Under the protection of dry nitrogen, put 0.6 mole of ethylenediamine into a 1000 mL four-necked reaction flask filled with 120 mL of propylene glycol methyl ether solution. The 1000mL four-necked reaction flask is equipped with a reflux condenser, a thermometer and a stirrer. The stirring paddle type is an anchor impeller stirring paddle, and the stirring speed is 500rm -1 Left and right, the heating form is a constant temperature in a water bath. When the temperature in the reaction bottle rises to 70°C, add 0.3 moles of polyether polyol diglycidyl ether (NPER-032) dropwise at a rate of 60 mL per hour to the reaction bottle for reaction, and then keep it warm for 2 hours after the addition is complete. about.

[0027] After decompression distillation to remove excess ethylenediamine, in the aforementioned reaction device, when the temperature in the reaction bottle is 65°C, add 0.15 moles of liquid epoxy resin EPON828 dropwise at a rate of 60 mL per hour to the abov...

Embodiment 3

[0029] Under the protection of dry nitrogen, put 0.6 mol of diethylenetriamine into a 1000 mL four-necked reaction flask filled with 100 mL of propylene glycol methyl ether solution. The four-necked reaction flask is equipped with a reflux condenser, a thermometer and a stirrer. The stirring paddle type is an anchor impeller stirring paddle, the stirring speed is about 500rm-1, and the heating form is a water bath constant temperature. When the temperature in the reaction bottle rises to 60°C, add 0.2 moles of polyether polyol diglycidyl ether (NPER-032) dropwise at a rate of 60 mL per hour to the reaction bottle for reaction, and then keep it warm for 2 hours after the dropwise addition about.

[0030] After the excess diethylenetriamine was removed by distillation under reduced pressure, in the aforementioned reaction device, when the temperature in the reaction bottle was 65°C, 0.1 mole of liquid epoxy resin E-51 was added dropwise at a rate of 60 mL per hour to The react...

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Abstract

The invention discloses a process of preparing non-ionic cold curing water- based epoxy curing agent. It comprises following steps: adding polyether polyols diglycidyl ether or polyether epoxide resin or mixture of them into organic solution of aromatic polyamine or aliphatic polyamine for chain extension reaction, then adding epoxide resin solution for futher chain extension reactor; dropping distilled water at 20-90 Deg. C to dilute product until the solid content being 30- 80%, and getting non-ionic cold curing water- based epoxy curing agent. The invention introduces epoxide resin molecular chain segment into curing agent, which increases the compatability between curing agent and epoxide resin, and the water- based epoxy curing agent and liquid epoxide resin are used, they possess function of emulsion liquid epoxide resin. The invention is characterized by easy process and temperate reaction condition.

Description

technical field [0001] The invention relates to an epoxy resin curing agent, in particular to a preparation method of a nonionic room temperature curing water-based epoxy curing agent. Background technique [0002] Epoxy resin has the advantages of small shrinkage, excellent bonding performance, good mechanical properties, electrical properties and acid and alkali resistance, and is widely used in coatings, adhesives and other fields. In the application of epoxy resin, the curing agent occupies a very important position. Although epoxy resin has excellent performance, its cured product has the defect of brittle performance. Although the brittleness can be improved by adding rubber elastomer or thermoplastic resin, this will bring trouble and inconvenience to the molding process, and the use of a tough curing agent containing a flexible segment has corresponding advantages. At present, although there are a small number of literature reports on tough epoxy curing agents, mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08G59/40C08L63/00
Inventor 胡剑青周继亮涂伟萍
Owner SOUTH CHINA UNIV OF TECH
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