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Nonionic waterborne epoxy resin curing agent and preparation method thereof

A water-based epoxy resin, non-ionic technology, applied in epoxy resin coatings, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of brittle coating film, short pot life, poor impact performance, etc. The reaction conditions are mild, the reaction speed is accelerated, and the preparation cost is low.

Active Publication Date: 2020-09-04
SICHUAN VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early days, amidated polyamine was used as the curing agent of type I water-based epoxy system. Although it can emulsify liquid epoxy resin, its performance after curing is not good, and its water resistance and chemical resistance are poor. It needs to be modified. In order to ensure that the performance after curing is close to that of solvent-based epoxy resin coatings
Due to the short pot life of the epoxy resin system emulsified by the polyamide curing agent, the cured coating film has poor flexibility, poor impact performance, and brittle coating film, the performance of the modified polyamide curing agent is still Not ideal, therefore, the curing agent used for type I waterborne epoxy system is mainly polyamine-epoxy adduct

Method used

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  • Nonionic waterborne epoxy resin curing agent and preparation method thereof
  • Nonionic waterborne epoxy resin curing agent and preparation method thereof
  • Nonionic waterborne epoxy resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of nonionic water-based epoxy resin curing agent, comprising the following steps:

[0031] (1) Synthesis of addition product of ethylene glycol diglycidyl ether (SY-669) and 3,4-dimethoxyaniline

[0032] Under the protection of dry nitrogen, with absolute ethanol as a solvent, ethylene glycol diglycidyl ether (B) is packed into a three-necked flask with a constant pressure funnel, a reflux condenser and a stirrer, and when the temperature is raised to 65 ° C, then Transfer the 3,4-dimethoxyaniline (A) dissolved in ethanol to a constant pressure dropping funnel, and slowly drop it into a three-necked flask. After the dropwise addition, keep it warm for a period of time. After the reaction is completed for 4 hours, steam at 45°C to obtain a brown oily ethylene glycol diglycidyl ether (SY-669)-3,4-dimethoxyaniline addition product ( B-A-B). Raw material ratio n(SY-669):n(3,4-dimethoxyaniline)=3.0:1.

[0033] (2) Triethylenetetramine (TEDA) capped sy...

Embodiment 2

[0036] A preparation method of nonionic water-based epoxy resin curing agent, comprising the following steps:

[0037] (1) Synthesis of addition product of ethylene glycol diglycidyl ether (SY-669) and 3,4-dimethoxyaniline

[0038] Under the protection of dry nitrogen, with absolute ethanol as a solvent, ethylene glycol diglycidyl ether (B) is packed into a three-necked flask with a constant pressure funnel, a reflux condenser and a stirrer, and when the temperature is raised to 70 ° C, then Transfer the 3,4-dimethoxyaniline (A) dissolved in ethanol to a constant pressure dropping funnel, and slowly drop it into a three-necked flask. After the dropwise addition, keep it warm for a period of time. After the reaction is completed for 5 hours, steam at 45°C to obtain a brown oily ethylene glycol diglycidyl ether (SY-669)-3,4-dimethoxyaniline addition product ( B-A-B). Raw material ratio n(SY-669):n(3,4-dimethoxyaniline)=3.5:1.

[0039] (2) Triethylenetetramine (TEDA) capped sy...

Embodiment 3

[0042] A preparation method of nonionic water-based epoxy resin curing agent, comprising the following steps:

[0043] (1) Synthesis of addition product of ethylene glycol diglycidyl ether (SY-669) and 3,4-dimethoxyaniline

[0044] Under the protection of dry nitrogen, with absolute ethanol as a solvent, ethylene glycol diglycidyl ether (B) is packed into a three-necked flask with a constant pressure funnel, a reflux condenser and a stirrer, and when the temperature is raised to 60 ° C, then Transfer the 3,4-dimethoxyaniline (A) dissolved in ethanol to a constant pressure dropping funnel, and slowly drop it into a three-necked flask. After the dropwise addition, keep it warm for a period of time. After the reaction is completed for 3 hours, steam at 45°C to obtain a brown oily ethylene glycol diglycidyl ether (SY-669)-3,4-dimethoxyaniline addition product ( B-A-B). Raw material ratio n(SY-669):n(3,4-dimethoxyaniline)=2.5:1.

[0045] (2) Triethylenetetramine (TEDA) capped sy...

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PUM

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Abstract

The invention discloses a nonionic waterborne epoxy resin curing agent and a preparation method thereof. The method comprises the following steps: (1) heating an ethylene glycol diglycidyl ether solution to 60-90 DEG C, then adding a 3,4-dimethoxyaniline solution, carrying out a heat-preserved reaction for 3-10 h in a protective gas atmosphere, and carrying out evaporation and concentration to obtain an ethylene glycol diglycidyl ether-3,4-dimethoxyaniline addition product; and (2) stirring and heating the product obtained in the step (1) to 50-70 DEG C, then adding an end-capping reagent, carrying out a heat-preserved reaction for 3-10 h, and then carrying out evaporation and concentration. The method is mild in reaction conditions and is safe and environmentally friendly, and the prepared curing agent is high in yield.

Description

technical field [0001] The invention belongs to the technical field of epoxy resin curing agent synthesis, and in particular relates to a nonionic water-based epoxy resin curing agent and a preparation method thereof. Background technique [0002] Research new curing agents that can improve moisture and heat resistance, toughen and strengthen, improve insulation, improve flame retardancy, reduce viscosity, and improve processing performance, improve the performance of existing resin curing agents through modification, and achieve curing through compounding technology The high efficiency and multi-function of the agent are the research and development direction of the epoxy resin curing agent. In recent years, many countries have successively promulgated environmental regulations restricting volatile organic solvents (VOC). Water-based coatings have become an important trend in the development of coatings. and chemical properties have a crucial impact. In foreign countries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C09D163/00C07C213/04C07C217/84
CPCC08G59/5033C09D163/00C07C213/04C07C217/84
Inventor 徐友辉陈自然王碧陶果
Owner SICHUAN VOCATIONAL & TECHN COLLEGE
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