Preparation method of graphene oxide modified waterborne polyurethane anti-corrosive emulsion

A water-based polyurethane and graphene modification technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as uniform dispersion, coating defects, and graphene is difficult to play a physical partition effect, and achieves improved dispersion. Stability, the effect of improving shielding ability

Active Publication Date: 2018-04-06
海安常州大学高新技术研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The blending modification of graphene and polyurethane materials has been reported in the literature, but there is a strong van der Waals force between the graphene sheets, which makes it difficult to disperse uniformly in the resin system, and the prepared composite coating is

Method used

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  • Preparation method of graphene oxide modified waterborne polyurethane anti-corrosive emulsion

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Experimental program
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Embodiment 1

[0022] Add 100 parts by mass of N,N-dimethylformamide, 20 parts by mass of graphene oxide, 1 part by mass of triethylamine, and 2 parts by mass of glycidyl neodecanoate in the reactor, and react at 130°C for 4 hours. The reaction material is cooled to 30°C, centrifuged, and the centrifugal filter cake is placed in a vacuum dryer at 80°C, controlled with an absolute pressure of ≤20Pa, and dried for 4 hours to obtain modified graphene oxide;

[0023] Add 0.2 parts by mass of the modified graphene oxide obtained in step 1, 25 parts by mass of isophorone diisocyanate, and 25 parts by mass of poly-1,4-butylene adipate, and react at 85°C for 3 hours , cooled to 60°C, and then added 2 parts by mass of dibutyltin dilaurate, 6 parts by mass of N-methylpyrrolidone, 10 parts by mass of E-44 epoxy resin, 8 parts by mass of 2,2-dimethylolpropionic acid , 2 parts by mass of trimethylolpropane were reacted for 5 hours, 4 parts by mass of triethylamine was added at 60°C for 1 hour, 70 parts b...

Embodiment 2

[0029] Add 100 parts by mass of N,N-dimethylformamide, 40 parts by mass of graphene oxide, 2 parts by mass of N-methylimidazole, and 4 parts by mass of glycidyl neodecanoate in the reactor, and react at 120°C for 5 hours , cooling the reaction material to 30°C, centrifuging, placing the centrifugal filter cake in a vacuum dryer at 80°C, controlling the absolute pressure ≤ 20Pa, and drying for 4 hours to obtain modified graphene oxide.

[0030] Add 0.1 parts by mass of the modified graphene oxide obtained in step 1, 20 parts by mass of isophorone diisocyanate, and 20 parts by mass of poly-1,4-butylene adipate, and react at 85°C for 3 hours , cooled to 60°C, and then added 4 parts by mass of dibutyltin dilaurate, 8 parts by mass of N-methylpyrrolidone, 5 parts by mass of E-20 type epoxy resin, 10 parts by mass of 2,2-dimethylolpropionic acid , 1 mass part of trimethylolpropane was reacted for 5 hours, 3 mass parts of triethylamine was added at 60°C for 1 hour, 90 mass parts of d...

Embodiment 3

[0032] Add 100 parts by mass of N,N-dimethylformamide, 60 parts by mass of graphene oxide, 3 parts by mass of triphenylphosphine, and 3 parts by mass of glycidyl neodecanoate into the reactor, and react at 150°C for 3 hours. The reaction material was cooled to 30°C, centrifuged, and the centrifugal filter cake was placed in a vacuum dryer at 80°C, controlled with an absolute pressure of ≤20Pa, and dried for 4 hours to obtain modified graphene oxide.

[0033] Add 0.5 parts by mass of the modified graphene oxide obtained in step 1, 40 parts by mass of isophorone diisocyanate, and 40 parts by mass of poly-1,4-butylene adipate, and react at 85°C for 3 hours , cooled to 60°C, and then added 5 parts by mass of dibutyltin dilaurate, 5 parts by mass of N-methylpyrrolidone, 15 parts by mass of E-51 epoxy resin, 5 parts by mass of 2,2-dimethylol propionic acid , 3 parts by mass of trimethylolpropane were reacted for 5 hours, 4 parts by mass of triethylamine was added at 60°C for 1 hour,...

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Abstract

The invention relates to a preparation method of a graphene oxide modified waterborne polyurethane anti-corrosive emulsion, relating to the technical field of preparation of aqueous coatings. The preparation method comprises the following steps: firstly, mixing N,N-dimethylformamide, graphene oxide, a catalyst and glycidyl neocyanate to react to obtain modified graphene oxide; then mixing the graphene oxide, isophorone diisocyanate and polyadipic acid-1,4-butanediol ester, raising the temperature to 85 DEG Ca and then reducing the temperature to 60 DEG C; then adding dibutyltin dilaurate, 5-N-methyl pyrrolidone, epoxy resin, 2,2-dimethylolpropionic acid and trimethylolpropane to react; adding triethylamine to react at the temperature of a reaction material of 60 DEG C; then adding deionized water at 60 DEG C to react; reducing the temperature to 40 DEG C; carrying out filtration; and taking the filtered object to obtain the graphene oxide modified waterborne polyurethane anti-corrosiveemulsion. The shielding capacity of a graphene oxide sheet layer can be further improved by means of hydrophobic effect formed by a long alkyl chain grafted to the surface of graphene oxide.

Description

technical field [0001] The invention relates to the technical field of water-based paint preparation. Background technique [0002] Metals are prone to corrosion damage and material aging in various complex environments. Coating high-performance anti-corrosion coatings for long-term corrosion protection can greatly reduce maintenance frequency, reduce maintenance costs, and prolong service life. Graphene is based on sp 2 The single-layer two-dimensional honeycomb crystal structure formed by the close packing of hybrid forms has a large specific surface area and excellent electrical, mechanical, thermal and optical properties. By introducing graphene, the adhesion, impact resistance and other properties of the coating can be enhanced, as well as the shielding and barrier performance to the medium, while the thickness of the coating film can be greatly reduced, and the anti-corrosion life of the coating can be improved. Therefore, the composite material formed by graphene a...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/38C08G18/40C08G18/42C08G18/58C08G18/65C08G18/66C08G18/75C09D175/06C09D5/08
Inventor 方永勤梅俊龙王瑾许亮
Owner 海安常州大学高新技术研发中心
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