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A kind of epoxy resin/montmorillonite nanocomposite coating for metal surface

An epoxy resin and nanocomposite technology, applied in epoxy resin coatings, anti-corrosion coatings, coatings and other directions, can solve the problems of accelerated metal corrosion, slow curing and drying speed, long time, etc., to increase flexibility, huge reserves, Simple preparation method

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional epoxy resin / montmorillonite composite membrane material has a slow curing and drying speed and a long time, and there is a certain degree of adhesiveness at the interface between the film and the metal, and at the interface between the film and the air, which makes the interface between the film and the air easy to stick and absorb fine dust. A series of impurities such as debris, water droplets and charged monomers, if exposed to the air for a long time, not only makes the anti-corrosion film on the metal surface look dirty, but also easily generates a small current between the metal-film-impurity and thus Accelerate the corrosion of metal, resulting in the inability to achieve the anti-corrosion effect of the metal surface

Method used

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  • A kind of epoxy resin/montmorillonite nanocomposite coating for metal surface
  • A kind of epoxy resin/montmorillonite nanocomposite coating for metal surface
  • A kind of epoxy resin/montmorillonite nanocomposite coating for metal surface

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preparation example Construction

[0044] Preparation of hexadecylamine modified montmorillonite:

[0045] Dissolve the original sodium-based montmorillonite and deionized water in a 2000mL beaker at a ratio of 1:20, ultrasonic (200W, 100%), accompanied by mechanical stirring (20Kr / min) for 12h, and stand still for 72h, after the stratification is obvious Get the middle colloidal part and centrifuge (8000r / min, 6min), and the precipitation in the centrifuge tube is dried for subsequent use with a beaker, obtain the montmorillonite after purification ( image 3 e, 3f, with a thickness of about 0.12 μm). Take 8mol·L -1 Lithium chloride solution is used as stripping agent, 2g of purified montmorillonite and 70mL of lithium chloride solution are evenly mixed in a 100mL hydrothermal reaction kettle, hydrothermal reaction is carried out at 140°C for 24 hours, and the sample is centrifuged and washed until the separation liquid does not contain Cl - (Add AgNO 3 no precipitation), dried and ground to obtain the strip...

Embodiment 1

[0049] Preparation of epoxy resin / montmorillonite nanocomposite film: Add 100 parts of epoxy resin E51, 3 parts of organically modified montmorillonite, and 15 parts of reactive diluent 669 into a 250 mL three-necked flask, stir well, and heat up to 80 ° C. Insulate and stir for 2 hours, then ultrasonically disperse at 80°C for 10 minutes, and then vacuum defoam for 10 minutes; after cooling to close to room temperature, add 50 parts of curing agent polyamide 650 and 3 parts of accelerator DMP-30 into the mixture, stir well and then coat One layer was placed on the surface of the aluminum sheet and cured at room temperature for 48 hours to prepare the epoxy resin / montmorillonite nanocomposite material.

[0050] The CHI660 electrochemical workstation of Shanghai Chenhua Company was used to test the salt resistance (1.0mol / L NaCl solution) and acid resistance (0.5mol / L H 2 SO 4 Solution) corrosion electrochemical test, the results are as follows Image 6 , 7 , 8 and 9, it can...

Embodiment 2

[0052] Preparation of epoxy resin / montmorillonite nanocomposite film: Add 100 parts of epoxy resin E51, 3 parts of organically modified montmorillonite, and 15 parts of reactive diluent 669 into a 250 mL three-necked flask, stir well, and heat up to 80 ° C. Insulate and stir for 2 hours, then ultrasonically disperse at 80°C for 10 minutes, and then vacuum defoam for 10 minutes; after cooling to close to room temperature, add 50 parts of curing agent polyamide 650 and 3 parts of accelerator DMP-30 into the mixture, stir well and then coat Two layers were placed on the surface of the aluminum sheet and cured at room temperature for 48 hours to prepare the epoxy resin / montmorillonite nanocomposite material.

[0053] The CHI660 electrochemical workstation of Shanghai Chenhua Company was used to test the salt resistance (1.0mol / L NaCl solution) and acid resistance (0.5mol / L H 2 SO 4 Solution) corrosion electrochemical test, the results are as follows Image 6 , 7 , 8 and 9, it c...

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Abstract

The invention relates to an epoxy resin / montmorillonite nanocomposite coating for metal surfaces and a method for preparing a composite film by using the nanocomposite coating. In the present invention, lithium chloride is used to peel off the montmorillonite sheets, and hexadecylamine is used to organically modify the peeled montmorillonite, so that the hydrophilic montmorillonite is transformed into lipophilic, and the interlayer distance of the montmorillonite is expanded. , the interlayer force becomes weaker, so that the montmorillonite can be more uniformly dispersed in the polymer. The preparation method of the epoxy resin / montmorillonite nanocomposite membrane material is simple, does not require complex equipment, and has huge reserves of sodium montmorillonite, which is suitable for industrial production.

Description

[0001] (1) Technical field [0002] The invention relates to an epoxy resin / montmorillonite nanocomposite coating for metal surfaces and a method for preparing a composite film by using the nanocomposite coating. [0003] (2) Background technology [0004] The research and development of aluminum alloy has improved the comprehensive performance of aluminum, so aluminum alloy is widely used in many aspects such as transportation, machinery manufacturing, aerospace and electrical components. Due to the poor corrosion resistance of aluminum alloy, it has brought certain troubles to its maintenance. Therefore, many anti-corrosion treatment processes for aluminum alloys have been developed correspondingly, such as passivation treatment technologies such as chromate, phosphate and molybdate, but there are serious environmental pollution problems, and these treatment processes are complex and costly. big. With the gradual improvement of environmental protection requirements and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D7/62C09D5/08
CPCC08K2201/011C09D5/08C09D163/00C09D7/62C08K9/04C08K3/346
Inventor 李国华刘静祎刘书杰高静
Owner ZHEJIANG UNIV OF TECH
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