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Waterborne epoxy curing agent, preparation method thereof and waterborne epoxy coating

A technology of water-based epoxy and water-based epoxy resin, applied in the field of coatings, can solve the problems of unsatisfactory mechanical properties and resistance of coating films, general water dilution, etc.

Pending Publication Date: 2021-12-24
江苏富琪森新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water dilutability of many water-based epoxy curing agents is general, and the mechanical properties and resistance of the coating film prepared in water-based epoxy coatings are not ideal.

Method used

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  • Waterborne epoxy curing agent, preparation method thereof and waterborne epoxy coating

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preparation example Construction

[0033] The embodiment of the present application provides a kind of preparation method of above-mentioned waterborne epoxy curing agent, it comprises the following steps:

[0034] Step 1, preparing novolac epoxy resin modified amine solution.

[0035] As an embodiment, the novolak epoxy resin modified amine solution is mainly obtained by mixing and reacting 30 parts of novolac epoxy resin, 25-35 parts of organic fatty amine and 25-35 parts of solvent in parts by mass. Wherein, the organic aliphatic amine corresponds to the R group, and may include at least one of ethylenediamine, hexamethylenediamine, diethylenetriamine, tetraethylenepentamine and polyethylenepolyamine. The solvent is used to dissolve organic aliphatic amines and novolac epoxy resins, such as propylene glycol methyl ether and ethylene glycol butyl ether.

[0036] Specifically, the preparation method of novolak epoxy resin modified amine solution comprises the following steps:

[0037] Mix and stir the organi...

Embodiment 1

[0043] The present embodiment provides a water-based epoxy curing agent, which is prepared according to the following steps:

[0044] Step 1, prepare novolac epoxy resin modified amine solution:

[0045] In parts by weight, pour 15 parts by weight of propylene glycol methyl ether into a three-necked flask, then add 30 parts by weight of diethylenetriamine (organic fatty acid), and stir to dissolve diethylenetriamine in propylene glycol methyl ether to obtain a dissolved solution ; Slowly add 30 parts by weight of novolac epoxy resin dissolved by 15 parts by weight of propylene glycol methyl ether slowly in the three-necked flask subsequently, control the temperature of the solution in the three-necked flask during the dropping process at 60 ° C, continue to insulate after the dropwise addition After reacting for 3 hours, the solid content was adjusted to 50% by adding deionized water and stirring to obtain a novolak epoxy resin modified amine solution.

[0046] The novolak ep...

Embodiment 2

[0053] The present embodiment provides a water-based epoxy curing agent, which is prepared according to the following steps:

[0054] Step 1, prepare novolac epoxy resin modified amine solution:

[0055] In parts by weight, pour 15 parts by weight of propylene glycol methyl ether into a three-necked flask, then add 30 parts by weight of ethylenediamine, and stir to dissolve ethylenediamine in propylene glycol methyl ether to obtain a dissolved solution; Slowly add 30 parts by weight of novolac epoxy resin dissolved by 15 parts by weight of propylene glycol methyl ether dropwise in the flask, control the temperature of the solution in the three-necked flask during the dropping process at 60 ° C, continue the insulation reaction for 2 hours after the dropwise addition, adjust the solid Containing 50%, prepared novolak epoxy resin modified amine solution.

[0056] The novolak epoxy resin modified amine solution is a light yellow liquid with a solid content of 50% and a viscosity...

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Abstract

The invention provides a waterborne epoxy curing agent, a preparation method thereof and a waterborne epoxy coating, and relates to the technical field of coatings. The waterborne epoxy curing agent comprises a compound, and the compound is formed by introducing a polyether chain segment and a bisphenol A chain segment to a primary amine position of an R group in novolac epoxy resin modified amine. The waterborne epoxy coating comprises a water-based epoxy emulsion and the waterborne epoxy curing agent. The waterborne epoxy coating formed by the waterborne epoxy curing agent has good water dilutability, and the obtained coating film has excellent mechanical properties, water resistance and corrosion resistance.

Description

technical field [0001] The application relates to the technical field of coatings, in particular, to a water-based epoxy curing agent, a preparation method thereof, and a water-based epoxy coating. Background technique [0002] Novolac epoxy resin is usually obtained by epoxidizing thermoplastic linear low molecular weight phenolic resin with epichlorohydrin under the action of a catalyst. Novolac epoxy resin is a kind of multifunctional epoxy resin. Novolac epoxy resin is used as epoxy resin curing agent, especially in coatings. The prepared coating film has excellent hardness, heat resistance and corrosion resistance. sex etc. At present, coatings formed by epoxy novolac resins have been widely used as coatings for food cans, high-performance primers, and insulating varnishes for wires. [0003] At present, most of the new water-based epoxy curing agents on the market are developed by modifying multifunctional novolac epoxy resins to obtain lower molecular weight water-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/64C09D163/00
CPCC08G59/64C09D163/00
Inventor 邓煜东闫磊
Owner 江苏富琪森新材料有限公司
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