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Ionic-type waterborne epoxy curing agent and preparing method and application thereof

A water-based epoxy and curing agent technology, used in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve problems such as instability, flash rust of metal coatings, and decline in coating performance.

Active Publication Date: 2019-07-30
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of organic acids will cause flash rust on the metal coating, which will degrade the performance of the coating
Moreover, this type of curing agent is easily affected by pH changes, for example, it is prone to instability when used with alkaline pigments and fillers
[0009] In order to improve the hydrophilicity of the curing agent, in the patent document CN 108250411 A, polyethylene polyamine was modified by introducing sulfonate to obtain a hydrophilic structure, but there is no epoxy resin structure in the curing agent structure , so that it has poor compatibility when mixed with emulsion, and the paint film can only be used in moderate anti-corrosion fields

Method used

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  • Ionic-type waterborne epoxy curing agent and preparing method and application thereof
  • Ionic-type waterborne epoxy curing agent and preparing method and application thereof
  • Ionic-type waterborne epoxy curing agent and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Add 300g of isophoronediamine to the reaction bottle, and preheat the temperature to 80°C; gradually drop 160g of epoxy resin E51 into the reaction bottle through a peristaltic pump to carry out the ring-opening reaction, the dropping time lasts for 1 hour, and continue to keep warm Half an hour; after the ring-opening reaction finishes, utilize a vacuum pump to carry out vacuum distillation to the material in the reaction bottle, after removing redundant isophorone diamine in the reaction system, add 120g deionized water in the system to disperse, and then Use a peristaltic pump to gradually drop 100g of butyl glycidyl ether into the reaction bottle for reaction. The dropping time is 1 hour, and keep warm for half an hour; slowly add 5g of propane sultone into the system, and then add 1.7g of NaOH after 10 minutes of reaction. Neutralize, and then add 15g of polyetheramine D400, and stir to obtain the curing agent. The solid content of the obtained curing agent was 73....

Embodiment 2

[0066] Add 280g of diethylenetriamine into the reaction bottle, preheat the temperature to 80°C; gradually drop 150g of epoxy resin E51 into the reaction bottle through a peristaltic pump to carry out the ring-opening reaction, the dropping time lasts for 1 hour, and continue to keep warm for half an hour After the ring-opening reaction finishes, utilize a vacuum pump to carry out decompression distillation to the material in the reaction bottle, after removing redundant diethylenetriamine in the reaction system, add 130g deionized water to disperse in the system, utilize the peristaltic pump again 95g of phenylglycidyl ether was gradually dropped into the reaction bottle for reaction, the dropping time was 1 hour, and the temperature was kept for half an hour; 6g of propane sultone was slowly added to the system, after half an hour of reaction, 2g of NaOH was added for neutralization, and stirred After uniformity, the curing agent is obtained. The solid content of the obtaine...

Embodiment 3

[0068] Add 350g of diethylenetriamine to the reaction bottle, preheat the temperature to 80°C; gradually drop 150g of epoxy resin E51 into the reaction bottle through a peristaltic pump to carry out the ring-opening reaction, the dropping time lasts for 1 hour, and continue to keep warm for half an hour After the ring-opening reaction finishes, utilize a vacuum pump to carry out decompression distillation to the material in the reaction bottle, after removing redundant diethylenetriamine in the reaction system, add 140g deionized water to disperse in the system, utilize the peristaltic pump again 110g of phenylglycidyl ether was gradually dropped into the reaction bottle for reaction, the dropping time was 1 hour, and the temperature was kept for half an hour; 6g of propane sultone was slowly added into the system, stirred evenly after half an hour of reaction, and the curing agent was obtained. The solid content of the obtained curing agent was 76.2wt%, the amine value was 295...

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Abstract

The invention belongs to the technical field of waterborne epoxy coatings, and particularly relates to an ionic-type waterborne epoxy curing agent and a preparing method and application thereof. The waterborne epoxy curing agent is prepared by reacting, by weight, 1 part of a poly-epoxy compound, 1.3-6 parts of a polyfunctional group compound, 0.2-1.25 parts of a single-epoxy compound and 0.01-0.23 part of sultones, wherein the polyfunctional group compound carries 4 or more active hydrogen atoms. The obtained curing agent has a good hydrophilic effect and great thinning performance, so that apaint film which is prepared through mixing of the curing agent and an epoxy dispersoid has the advantages of excellent salt fog resistance, water resistance, high adhesive power, high hardness and the like; the curing agent is simple in preparing process, mild in condition and capable of achieving room-temperature curing.

Description

technical field [0001] The invention belongs to the technical field of water-based epoxy coatings, in particular to an ionic water-based epoxy curing agent and its preparation method and application. Background technique [0002] In the coating and adhesive industry, due to the huge harm caused by the solvent itself to the human respiratory system and nervous system, solvent-based coatings and adhesives have gradually faded out of the stage, and a shift from oil-based products to Waterborne products are taking the storm, and so are trends in epoxy coatings. However, compared with solvent-based coatings, water-based coatings are relatively deficient in many properties, which limits their popularization to a certain extent. For water-based epoxy coatings, the problem of insufficient salt spray resistance is the core factor affecting their popularization and application, especially in the field of heavy anti-corrosion. Therefore, improving the salt spray resistance performanc...

Claims

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Application Information

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IPC IPC(8): C08G59/40
CPCC08G59/4064C09D5/08C09D163/00C09D7/65C08G59/184C08G59/56C08G2650/50C08G59/502C08G59/223
Inventor 王晓纪学顺李卫飞曲瑞张成彬邓俊英孙家宽周兵王峤龚吉
Owner WANHUA CHEM GRP CO LTD