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A kind of graphene slurry for anionic waterborne polyurethane coating and its preparation method and application

A water-based polyurethane, anionic technology, used in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problems of graphene agglomeration and stacking, and achieve increased crosslinking density, improved mechanical properties, and long storage time. Effect

Active Publication Date: 2019-04-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned graphene, as a nano-filler, is added to water-based paints, and there are technical problems such as graphene agglomeration and cascading, which is the biggest bottleneck faced by graphene in paint applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A graphene slurry for anionic water-based polyurethane coatings is a water dispersion of modified graphene obtained by dispersing modified graphene obtained after graphene oxide is modified with carbodiimide into water, modified graphene In the aqueous dispersion of the modified graphene, the modified graphene: water ratio is 2 mg: 1 ml, calculated according to the dry weight of the modified graphene.

[0033] The preparation method of the graphene slurry that above-mentioned a kind of anionic waterborne polyurethane coating is used specifically comprises the following steps:

[0034] (1) Add graphene oxide into water, ultrasonically disperse in a water bath for 5 minutes to obtain a graphene oxide aqueous dispersion with a concentration of 2 mg / ml, and then add carbodiimide to obtain a mixed solution;

[0035] The graphene oxide is obtained by an improved Hummers method;

[0036] The carbodiimide is a commercially available emulsion type, the amount of carbodiimide ad...

Embodiment 2

[0045] A graphene slurry for anionic water-based polyurethane coatings is a water dispersion of modified graphene obtained by dispersing modified graphene obtained after graphene oxide is modified with carbodiimide into water, modified graphene In the aqueous dispersion liquid of the modified graphene, calculated according to the dry weight of the modified graphene, the ratio of modified graphene: water is 10mg: 1ml.

[0046] The preparation method of the graphene slurry that above-mentioned a kind of anionic waterborne polyurethane coating is used specifically comprises the following steps:

[0047] (1) Add graphene oxide into water, and ultrasonically disperse in a water bath for 5 minutes to obtain a graphene oxide aqueous dispersion with a concentration of 1 mg / ml, and then add carbodiimide to obtain a mixed solution;

[0048] The graphene oxide is obtained by an improved Hummers method;

[0049] The carbodiimide is a commercially available emulsion type, the amount of ca...

Embodiment 3

[0058] A graphene slurry for anionic water-based polyurethane coatings is a water dispersion of modified graphene obtained by dispersing modified graphene obtained after graphene oxide is modified with carbodiimide into water, modified graphene In the aqueous dispersion liquid of the modified graphene, calculated according to the dry weight of the modified graphene, the ratio of modified graphene: water is 20mg: 1ml.

[0059] The preparation method of the graphene slurry that above-mentioned a kind of anionic waterborne polyurethane coating is used specifically comprises the following steps:

[0060] (1) Add graphene oxide into water, ultrasonically disperse in a water bath for 5 minutes to obtain a graphene oxide aqueous dispersion with a concentration of 2 mg / ml, and then add carbodiimide to obtain a mixed solution;

[0061] The graphene oxide is obtained by an improved Hummers method;

[0062] The carbodiimide is a commercially available emulsion type, and the amount of ca...

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Abstract

The invention discloses graphene slurry for anionic aqueous polyurethane coatings, a preparation method of the graphene slurry and an application. The graphene slurry for the aqueous polyurethane coatings is modified graphene aqueous dispersion, oxidized graphene is modified by carbodiimide to obtain modified graphene, and the modified graphene is dispersed into water to obtain the modified graphene aqueous dispersion. In the modified graphene aqueous dispersion, according to the dry weight of the modified graphene, the ratio of the modified graphene to water is 2-20mg: 1ml. The graphene slurry can be matched with anionic aqueous polyurethane resin to achieve the advantage of long-term dispersion stability, is environmentally friendly and long in preservation time, and is capable of being preserved for at least one year at room temperature without deposition, flocculation or gelling. After use, the elastic modulus of the finally obtained coatings can reach 2.23-2.34GPa, and neutral salt spray time can reach 60-120 hours.

Description

technical field [0001] The invention belongs to the field of graphene and paint chemical industry, and in particular relates to a graphene slurry for anionic water-based polyurethane paint, a preparation method thereof, and an application thereof in water-based polyurethane paint. Background technique [0002] In recent years, governments at all levels in our country have suppressed the development of solvent-based coatings through policy guidance, while encouraging and supporting the development of environmentally friendly water-based coatings. However, the corrosion resistance, film-forming property and wear resistance of water-based coatings are not as good as those of solvent-based coatings, which limits the popularization and application of water-based coatings. Adding graphene and its derivatives is one of the effective ways to enhance the performance of coatings. Graphene has a large specific surface area, excellent mechanical properties and barrier properties, and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/46C09C3/08C09D175/04C09D5/08
CPCC09C1/46C09C3/08C09D5/08C09D175/04
Inventor 李静崔锦灿甘灵珠冯庆康杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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