Epoxy curing agent capable of being used for zinc-rich primer as well as preparation method and application of epoxy curing agent

A technology of epoxy curing agent and zinc-rich primer, which is used in epoxy resin coatings, coatings, anti-corrosion coatings, etc. Surface drying speed and other issues, to achieve the effect of improving coating ability, suitable surface drying time, and low VOC

Active Publication Date: 2021-05-07
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, liquid epoxy resin combined with water-soluble amine curing agent is difficult to achieve fast surface drying speed. In some fields that require high drying speed, such as water-based container coatings, the drying speed needs to be further improved
[0008] At present, the commercially available curing agents for zinc-rich primers are difficult to balance high solid content and low viscosity at the same time. It is also difficult to obtain a uniformly dispersed zinc-rich paint

Method used

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  • Epoxy curing agent capable of being used for zinc-rich primer as well as preparation method and application of epoxy curing agent
  • Epoxy curing agent capable of being used for zinc-rich primer as well as preparation method and application of epoxy curing agent
  • Epoxy curing agent capable of being used for zinc-rich primer as well as preparation method and application of epoxy curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1: Add 300g of diethylenetriamine (polyamine, its molar ratio to the polyepoxide is 7.9:1) in the reaction flask, preheat the temperature to 100°C, and use 140g of E51 (polyepoxide) The peristaltic pump is gradually dropped into the reaction bottle, the dropping time lasts for 2 hours, and the heat preservation is continued for 1 hour; use a vacuum pump to carry out vacuum distillation to remove 200g of excess amine; then add 100g of propylene glycol methyl ether to the system for dilution and adjust the temperature to 80°C, after the temperature was stabilized at 80°C, 40g butyl glycidyl ether and 20g 2-(3(2,2-dipropylpentyl)alkyl)propylpolyethylene oxide ( n=7) Gradually drop into the reaction bottle for 1 hour, keep warm at 80°C for half an hour; cool down to 50°C, add 10g of isophoronediamine into the system, and stir for 10min to obtain 410g of epoxy curing agent.

[0084] Curing agent viscosity: 170cP Solid content: 75.6% pH: 9.6

Embodiment 2

[0085] Example 2: Add 225g triethylenetetramine (polyamine, its molar ratio to polyepoxide is 4:1) in the reaction flask, preheat the temperature to 80°C, and use 170g E44 (polyepoxide) The peristaltic pump is gradually dripped into the reaction bottle, the dripping time lasts for 3 hours, and the heat preservation is continued for 0.5 hours; use a vacuum pump to carry out vacuum distillation to remove 135g of excess amine; then add 170g of propylene glycol methyl ether to the system for dilution and adjust the temperature to 90°C, and after the temperature was stabilized at 90°C, 50g of phenyl glycidyl ether and 20g of 2-(3(2,2-dipropylpentyl)alkyl)propylpolyethylene oxide ( n=20) was gradually dropped into the reaction bottle, the dropping time was 1 hour, and the temperature was kept at 90°C for half an hour; the temperature was lowered to 40°C, 3g of p-phenylenediamine was added into the system, and 503g of epoxy curing agent was obtained after stirring for 30min.

[0086]...

Embodiment 3

[0087] Example 3: Add 465g of diethylenetriamine (polyamine, its molar ratio to polyepoxide is 10.46:1) in the reaction flask, preheat the temperature to 70°C, and 200g of E51 and polyethylene glycol dishrink Glycerol ether mixture (mass ratio 1:1) (polyepoxide) was gradually dripped into the reaction flask using a peristaltic pump, the dripping time continued for 1 hour, and continued to keep warm for 1 hour, and the vacuum pump was used for vacuum distillation to remove excess amine Remove 390g, then add 100g propylene glycol methyl ether to the system for dilution, adjust the temperature to 100°C, and after the temperature is stabilized at 100°C, use a peristaltic pump to add 25g of carbon dodecyl to carbon tetradecyl glycidyl ether and 70g of 2 -(3(2,2-dipropylpentyl)alkyl)propylpolyethylene oxide (n=15) was gradually dripped into the reaction flask, the time of the addition was 0.5 hours, the temperature was kept at 100°C for half an hour, and the temperature was lowered t...

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Abstract

The invention relates to an epoxy curing agent capable of being used for a zinc-rich primer and a preparation method and anapplication of the epoxy curing agent, the curing agent is simple in formula, has excellent zinc powder coating capacity, can form stable and non-layered paste after being mixed with metal powder such as zinc powder, is completely compatible with water-based epoxy resin and is long in validity period. The curing agent is prepared from the following raw materials: (A) first modified amine which is prepared by reacting polyamine with a polyepoxy compound to prepare an amine-terminated intermediate and then reacting the amine-terminated intermediate with a monoepoxy compound; wherein the monoepoxy compound at least contains a monoepoxy compound S1; (B) with the following structural formula (I), and the second amine at least contains one primary amine group.

Description

technical field [0001] The invention relates to the field of water-based epoxy coatings, in particular to an anhydrous curing agent for matching water-dispersed epoxy resins, and can be used in zinc-rich curing agent systems to cure primers in the field of heavy anticorrosion. Background technique [0002] Waterborne epoxy coatings can be applied to industrial paints on various substrates, and have excellent protective effects, and have been widely used. This is due to the excellent chemical resistance of epoxy resin, and at the same time, it has good adhesion to most substrates (such as wood, metal, masonry surfaces). The water-based epoxy system with zinc powder has super excellent anti-corrosion performance and is widely used in heavy-duty anti-corrosion fields such as containers and marine machinery. [0003] Water-based epoxy coatings are mainly composed of two components: one component is epoxy water-based dispersion (ie emulsion); the other component is curing agent,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C09D5/10C09D163/00
CPCC08G59/504C08G59/5026C08G59/5033C09D163/00C09D5/106
Inventor 王晓纪学顺李卫飞曲瑞张成彬孙伟祖邓俊英孙家宽
Owner WANHUA CHEM GRP CO LTD
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