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Water-based epoxy resin curing agent emulsion and preparation method thereof

A technology of water-based epoxy resin and novolac epoxy resin, which is applied in the direction of epoxy resin coatings and coatings, can solve the problems of excessive amines, achieve the effects of increasing affinity, good compatibility, and reducing activity

Inactive Publication Date: 2012-05-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of using epoxy resin modified amine curing agent in the prior art that a large amount of amines must be used to provide a water-based epoxy resin modified organic polyamine without a large amount of amines curing agent emulsion

Method used

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  • Water-based epoxy resin curing agent emulsion and preparation method thereof

Examples

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Embodiment 1

[0032] A kind of aqueous epoxy resin curing agent emulsion and preparation thereof: (1) 12g bisphenol A novolac epoxy resin (epoxy equivalent 220g / eq) and 35g propylene glycol methyl ether are mixed, after it dissolves completely at 80 ℃, Add 1g of diethanolamine and react for 2 hours to obtain water-based novolac epoxy resin; (2) Take another 12g of diethylenetriamine and 35g of propylene glycol methyl ether, mix them and dissolve them completely at 60°C, then add 4g of acetic acid dropwise to react 0.5h, obtain modified organic polyamine; (3) then the aqueous novolac epoxy resin obtained in step (1) is evenly added dropwise in the modified organic polyamine of step (2) gained in 0.5h, 50 ℃ for 3h, then drop 2g of acetic acid at 60℃ for 0.5h to obtain the organic polyamine curing agent modified by novolac epoxy resin; The product was sheared and dispersed (2000rpm) under a high-speed stirrer, and 120g of distilled water was added, and stirred for 40 minutes to obtain a water-...

Embodiment 2

[0034] A water-based epoxy resin curing agent emulsion and its preparation: (1) 20g of bisphenol A novolak epoxy resin (epoxy equivalent 220g / eq) and 25g of dioxane are mixed, and after it is completely dissolved at 70°C , add 5g ethanolamine, and react for 2h to obtain water-based novolac epoxy resin; (2) Take another 15g 4,4'-diaminodiphenylmethane and 25g dioxane, mix them and dissolve them completely at 90°C , then drop 5g of acetic acid to react for 0.5h to obtain the modified organic polyamine; (3) then the water-based novolac epoxy resin obtained in step (1) is evenly added dropwise to the modified product obtained in step (2) in 0.5h. In a permanent organic polyamine, react at 90°C for 2h, then add 3g of acetic acid dropwise and react at 60°C for 0.5h to obtain a novolak epoxy resin modified organic polyamine curing agent; (4) the organic solvent of the product in step (3) After steaming out 20g, the remaining product was sheared and dispersed (1000rpm) under a high-sp...

Embodiment 3

[0036] A water-based epoxy resin curing agent emulsion and its preparation: (1) 14g o-cresol type novolak epoxy resin (epoxy equivalent 200g / eq) and 30g ethylene glycol ether are mixed, and it is completely dissolved at 80°C Finally, add 3g of diethanolamine and react for 1h to obtain water-based novolac epoxy resin; (2) take another 15g of 4,4'-diaminodiphenyl sulfone and 30g of ethylene glycol ethyl ether, mix them at 60°C Dissolve completely, add dropwise 4g propionic acid reaction 10min again, obtain modified organic polyamine; (3) then the aqueous novolak epoxy resin obtained in step (1) is evenly added dropwise to step (2) gained in 1h In the modified organic polyamine, react at 80°C for 3h, then add 3g of propionic acid dropwise at 60°C for 0.5h to obtain the organic polyamine curing agent modified by novolac epoxy resin; (4) the product in step (3) After the organic solvent evaporates 40g, the remaining product is sheared (1500rpm) under a high-speed stirrer, and 180g ...

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Abstract

The invention discloses water-based epoxy resin curing agent emulsion and a preparation method thereof. The method comprises the steps of: firstly, adding novolac epoxy resin and organic solvent into a reactor and dissolving the same completely under the condition of 50-80 DEG C; and then adding a modifier and reacting for 0.5-2 h, obtaining amine-modified novolac epoxy resin; meanwhile, taking organic polyamine and the organic solvent and mixing the same under the condition of 50-90 DEG C to dissolve the organic polyamine completely; next, dropwise adding organic acid and reacting for 10-60 min, obtaining modified organic polyamine; next, adding the water-based novolac epoxy resin into the salified organic polyamine, reacting at 40-100 DEG C for 1-3 h, obtaining a modified organic polyamine type water-based epoxy curing agent with self-emulsifying function, wherein the particle size of the curing agent emulsion is about 120 nm; the curing agent emulsion can be steadily stored for at least six months at room temperature and has good compatibility with epoxy resin; and the flexibility of film obtained by curing is at level 1, the adhesive force is at level 1, and the hardness can be 5H.

Description

technical field [0001] The invention relates to a water-based epoxy resin curing agent emulsion, more specifically the invention relates to a method for synthesizing and preparing a water-based epoxy resin curing agent emulsion with high crosslink density. technical background [0002] Traditional epoxy resin coatings are dissolved in organic solvents, which make them have high volatile organic components (VOC). In recent years, with the gradual strengthening of people's environmental awareness, reducing the VOC content of coatings and making coatings water-based is the development of the coatings industry. an inevitable trend. The matching epoxy resin curing agent is also often modified to be water-based, or it has the function of emulsifying the resin and has better compatibility with the resin. [0003] Among epoxy resin curing agents, amine curing agents have many types, large dosage and wide application, but general amine curing agents (such as ethylenediamine, diethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08G59/50C09D163/00C09D7/12
Inventor 文秀芳陆亚林皮丕辉蔡智奇程江杨卓如
Owner SOUTH CHINA UNIV OF TECH
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