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Graphene slurry for cationic waterborne polyurethane coating, and preparation method and application thereof

A water-based polyurethane and cationic technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as cascading and graphene agglomeration, and achieve improved mechanical properties, increased cross-linking density, and long storage time Effect

Active Publication Date: 2017-11-21
UNIV OF SHANGHAI FOR SCI & TECH +1
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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

[0034] A kind of graphene slurry for cationic water-based polyurethane coating, is that graphene is modified with carbodiimide, and the obtained modified graphene is dispersed in water to obtain an aqueous dispersion of modified graphene;

[0035] The amount of modified graphene in the water dispersion of modified graphene is calculated according to the ratio of dry weight of modified graphene: water is 2mg: 1ml.

[0036] The graphene slurry that above-mentioned a kind of cationic waterborne polyurethane coating is used, its preparation method specifically comprises the following steps:

[0037] (1) Add graphene oxide into water to obtain a graphene oxide aqueous dispersion with a concentration of 4 mg / ml, and then add carbodiimide to obtain a mixed solution;

[0038] The graphene oxide is obtained by an improved Hummers method;

[0039] The carbodiimide is a commercially available water dispersion type, the amount of carbodiimide added, calculated by mass ratio, carbodiimide...

Embodiment 2

[0048] A kind of graphene slurry for cationic water-based polyurethane coating, is that graphene is modified with carbodiimide, and the obtained modified graphene is dispersed in water to obtain an aqueous dispersion of modified graphene;

[0049] The amount of modified graphene in the water dispersion of modified graphene is calculated according to the ratio of dry weight of modified graphene: water is 20mg: 1ml.

[0050] The graphene slurry that above-mentioned a kind of cationic waterborne polyurethane coating is used, its preparation method specifically comprises the following steps:

[0051] (1) Add graphene oxide into water to obtain a graphene oxide aqueous dispersion with a concentration of 2 mg / ml, and then add carbodiimide to obtain a mixed solution;

[0052] The graphene oxide is obtained by an improved Hummers method;

[0053] The carbodiimide is a commercially available water dispersion type, the amount of carbodiimide added, calculated by mass ratio, carbodiimid...

Embodiment 3

[0060] A kind of graphene slurry for cationic water-based polyurethane coating, is that graphene is modified with carbodiimide, and the obtained modified graphene is dispersed in water to obtain an aqueous dispersion of modified graphene;

[0061] The amount of modified graphene in the water dispersion of modified graphene is calculated according to the ratio of modified graphene dry weight: water is 10mg: 1ml.

[0062] The graphene slurry that above-mentioned a kind of cationic waterborne polyurethane coating is used, its preparation method specifically comprises the following steps:

[0063] (1) Add graphene oxide into water to obtain a graphene oxide aqueous dispersion with a concentration of 1 mg / ml, and then add carbodiimide to obtain a mixed solution;

[0064] The graphene oxide is obtained by an improved Hummers method;

[0065] The carbodiimide is a commercially available water dispersion type, the amount of carbodiimide added, calculated by mass ratio, carbodiimide: ...

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Abstract

The invention discloses a graphene slurry for a cationic waterborne polyurethane coating, and a preparation method and application thereof. The graphene slurry for the cationic waterborne polyurethane coating is an aqueous dispersion of modified graphene prepared by modifying graphene oxide with carbodiimide to obtain the modified graphene and then dispersing the modified graphene in water, wherein in the aqueous dispersion of the modified graphene, a ratio of the modified graphene to water is 2-20 mg: 1 ml in terms of the dry weight of the modified graphene. The graphene slurry can be cooperated with cationic waterborne polyurethane resin, so the advantage of long-term stable dispersion is obtained, and the graphene slurry is friendly to environment, long in storage time and free of precipitation, flocculation and gelation after storage at room temperature for one year or more. A coating prepared from the graphene slurry has elastic modulus of 2.2-2.31 GPa and neutral salt spray time of 72 to 120 h.

Description

technical field [0001] The invention belongs to the field of graphene and coating chemical industry, and in particular relates to a graphene slurry for cationic water-based polyurethane coatings, a preparation method thereof and an application thereof in cationic water-based polyurethane coatings. 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 ...

Claims

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Application Information

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IPC IPC(8): C09C1/46C09C3/08C09D175/04C09D5/08
CPCC09C1/46C09C3/08C09D5/08C09D175/04
Inventor 李静甘灵珠崔锦灿冯庆康杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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