A kind of exfoliating montmorillonite loaded organic amine curing agent and its preparation method and application

A montmorillonite and curing agent technology, applied in the field of coatings, can solve the problems of coating rheological properties, metal wettability, curing shrinkage rate, brittle deterioration of paint film, phase separation and delamination, poor compatibility, etc., to improve corrosion protection. Effectiveness, reduced water absorption, excellent compatibility

Active Publication Date: 2020-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of filler is too high, it will cause the deterioration of the rheological properties of the coating, the wettability of the metal, the curing shrinkage rate, and the brittleness of the paint film.
In addition, the compatibility between inorganic fillers and organic epoxy resins is very poor. High-speed mechanical grinding is required to achieve the purpose of uniform dispersion of inorganic fillers in the coating when preparing coatings. However, inorganic fillers and organic rings will appear after storage for a period of time. Phase separation and delamination between epoxy resins can seriously lead to coating failure

Method used

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  • A kind of exfoliating montmorillonite loaded organic amine curing agent and its preparation method and application
  • A kind of exfoliating montmorillonite loaded organic amine curing agent and its preparation method and application
  • A kind of exfoliating montmorillonite loaded organic amine curing agent and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0027] To verify the preparation of coatings:

[0028] In order to test the use effect of the curing agent, the present invention is equipped with an epoxy coating for verification. After mixing the epoxy resin and solvent evenly at a high speed in a clean container, it is then treated with a coating grinding equipment for 10 to 30 minutes, and then passed through a sieve. The component A of the paint can be obtained after filtering through the net, and then poured into the tank for storage. Component B is respectively the exfoliation-type montmorillonite-loaded organic amine curing agent and the corresponding organic amine curing agent required by the present invention.

[0029] Paint application and verification coating preparation:

[0030] Mix components A and B of the verification paint evenly to prepare the paint to be painted. The paint coating process includes the following steps: ①Sandblasting or sanding the metal substrate to remove the surface of the metal substrat...

Embodiment 1

[0033] The first step is that 100 grams of cation exchange capacity (CEC) is the montmorillonite of 80 (meq / 100g) and adds 10000 grams of deionized water at room temperature and stirs for 24 hours to prepare montmorillonite dispersion liquid, simultaneously 180 grams of glycine and equimolar A large amount of 0.01mol / L hydrochloric acid was reacted to prepare a quaternary ammonium salt, then the quaternary ammonium salt was added to the montmorillonite dispersion and reacted at 80°C for 24 hours to prepare an organic montmorillonite with a carboxyl functional group, and the reaction product was washed repeatedly with distilled water, and Centrifuge or filter, and wash until the silver nitrate solution detects that no chloride ions are present. The product is dried, pulverized and stored in a desiccator. In the second step, organic montmorillonite with carboxyl functional groups, 1 gram of triethylamine as a catalyst, and 200 grams of diethylenetriamine were reacted at 240° C. ...

Embodiment 2

[0036] The first step is that 100 grams of cation exchange capacity (CEC) is the montmorillonite of 160 (meq / 100g) and adds 500 grams of N, in N-dimethylformamide, stirs 0.5 hour at 120 ℃ to prepare montmorillonite dispersion liquid, simultaneously 2 grams of aminoacetic acid was reacted with 1mol / L hydrochloric acid in an equimolar amount to prepare a quaternary ammonium salt, and then the quaternary ammonium salt was added to the montmorillonite dispersion and reacted at 100°C for 24 hours to prepare an organic montmorillonite with carboxyl functional groups. The product is repeatedly washed with N,N-dimethylformamide, centrifuged or filtered, and washed until the silver nitrate solution detects that no chloride ions are present. The product is dried, pulverized and stored in a desiccator. In the second step, the combination of organic montmorillonite with carboxyl functional group, 2 grams of dicyclohexylcarbodiimide, and 1 gram of 1-hydroxybenzotriazole is used as a cataly...

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Abstract

The invention belongs to the technical field of paint and particularly relates to a peeled type montmorillonoid loaded organic amine curing agent as well as a preparation method and application thereof. The curing agent is prepared from raw materials including montmorillonoid, amino acid, organic amine, a catalyst, a dispersant and a solvent, wherein a chemical structure is that an organic amine molecule is chemically grafted on the surface of a montmorillonoid nano-flake through quaternary ammonium salt of the amino acid; and the montmorillonoid nano-flake is at a peeled state. The peeled type montmorillonoid loaded organic amine curing agent can be uniformly dispersed into a coating formed by curing epoxy paint; the surface grafted organic amine molecule is used as a medium and the compatibility between the montmorillonoid nano-flake and epoxy resin in the paint is extremely improved; the problem of the montmorillonoid nano-flake that the interface compatibility is not good, caused by the fact that surface molecule structures of the organic epoxy resin is relatively great, is solved; and defects including agglomeration, separation, precipitation and the like of the montmorillonoid nano-flake in anticorrosive paint are avoided.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a peeling-type montmorillonite-loaded organic amine curing agent and a preparation method and application thereof. Background technique [0002] Organic coatings, as the most effective, economical, and widely used anti-corrosion method for metal materials, are the basis for anti-corrosion of metal substrates, and more than half of them are epoxy resin-based anti-corrosion coatings. A large number of anti-corrosion projects and scientific experiments at home and abroad have proved that flake-type fillers (mica, glass flakes, etc.) can improve the barrier performance of epoxy coatings to corrosive media. Based on the labyrinth effect formed by the scale filler in the coating, the transmission path of the corrosive medium in the coating is extended to achieve the purpose of blocking the transmission of the corrosive medium in the coating. However, the size of tradition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/62C09D5/08C09D163/00C08G59/50C09C1/40C09C3/06
CPCC08G59/5006C08G59/5013C08G59/5033C09C1/40C09C3/006C09C3/08C09D5/08C09D7/62C09D163/00
Inventor 吴航王福会朱圣龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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