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

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

Active Publication Date: 2019-01-15
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 graphene slurry for cationic waterborne polyurethane coatings is an aqueous dispersion of modified graphene obtained by modifying graphene with carbodiimide and dispersing the modified graphene into water;

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

[0036] The above-mentioned graphene slurry for cationic waterborne polyurethane coatings, and its preparation method specifically includes the following steps:

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

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

[0039] The carbodiimide is a commercially available water dispersion type. The amount of carbodiimide added is calculated by mass ratio, and the ratio of carbodiimide:graphene oxide is 5:1;

[0040] (2...

Embodiment 2

[0048] A graphene slurry for cationic waterborne polyurethane coatings is an aqueous dispersion of modified graphene obtained by modifying graphene with carbodiimide and dispersing the modified graphene into water;

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

[0050] The above-mentioned graphene slurry for cationic waterborne polyurethane coatings, and its preparation method specifically includes the following steps:

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

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

[0053] The carbodiimide is a commercially available water dispersion type. The amount of carbodiimide added is calculated by mass ratio, and the ratio of carbodiimide to graphene oxide is 20:1;

[0...

Embodiment 3

[0060] A graphene slurry for cationic waterborne polyurethane coatings is an aqueous dispersion of modified graphene obtained by modifying graphene with carbodiimide and dispersing the modified graphene into water;

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

[0062] The above-mentioned graphene slurry for cationic waterborne polyurethane coatings, and its preparation method specifically includes the following steps:

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

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

[0065] The carbodiimide is a commercially available water dispersion type. The amount of carbodiimide added is calculated by mass ratio, and the ratio of carbodiimide to graphene oxide is 10:1;

[0066]...

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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 chemicals, and specifically relates to a graphene slurry for cationic waterborne polyurethane coatings, a preparation method thereof, and application thereof in cationic waterborne polyurethane coatings. Background technique [0002] In recent years, governments at all levels in my country have adopted policy guidance to inhibit the development of solvent-based coatings, while encouraging and supporting the development of environmentally friendly water-based coatings. However, the corrosion resistance, film formation and abrasion resistance of water-based coatings are not as good as solvent-based coatings, which limits the promotion 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 has attracted more a...

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 李静甘灵珠崔锦灿冯庆康杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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