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A kind of graphene/polysiloxane composite coating material and preparation method thereof

A polysiloxane and composite coating technology, which is applied in coatings, conductive coatings, anti-corrosion coatings, etc., can solve the problems of large amount of fillers, reduction of mechanical properties such as coating flexibility, etc., and achieve the effect of improving mechanical properties

Active Publication Date: 2019-07-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned coating materials have the problems of large amount of fillers and reduced mechanical properties such as coating flexibility.

Method used

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  • A kind of graphene/polysiloxane composite coating material and preparation method thereof
  • A kind of graphene/polysiloxane composite coating material and preparation method thereof
  • A kind of graphene/polysiloxane composite coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Add 1 g of graphene oxide into 500 mL of N,N dimethylformamide solvent, then add 1 g of sodium lauryl sulfate dispersant, and ultrasonicate at room temperature for 0.5 hours. The uniformly dispersed mixed solution was transferred to a 1000 mL three-necked flask equipped with a mechanical stirrer, a reflux condenser, and a constant pressure dropping funnel. Add 2.4 g of isocyanate triethoxysilane into the reaction solution, and mechanically stir at 60° C. for 24 hours to obtain a modified graphene dispersion. The product was then isolated by suction filtration and washed 3 times with acetone / deionized water respectively. The product was dried at 60°C for 12 hours to obtain modified graphene.

Embodiment 2

[0071] Add 1g of graphene oxide into 25mL of dimethyl succinate and 25mL of dimethyl glutarate solvent, then add 0.5g of sodium lauryl sulfate dispersant, and disperse in a pressure reactor at 160°C for 2 hours with solvent heating and stirring. The uniformly dispersed mixed solution was transferred to a 1000 mL three-necked flask equipped with a mechanical stirrer, a reflux condenser, and a constant pressure dropping funnel. Add 4 g of isocyanate triethoxysilane into the reaction solution, reflux and stir at 100° C. for 12 hours, then add 5 g of hydrazine hydrate and continue the reaction for 12 hours to obtain a modified graphene dispersion. The product was then isolated by suction filtration and washed 3 times with acetone / deionized water respectively. The product was dried at 60°C for 12 hours to obtain modified graphene.

Embodiment 3

[0073] Add 1g of graphene oxide into 50mL of water, 50mL of ethanol, 50mL of acetone, and 50mL of butyl acetate mixed solvent, add 1g of ammonia water, 0.3g of dispersant (BKY190), and ultrasonically disperse at room temperature for 0.5 hours. The uniformly dispersed mixed solution was transferred to a 1000 mL three-necked flask equipped with a mechanical stirrer, a reflux condenser, and a constant pressure dropping funnel. Add 2 g of methacrylic acid, 2 g of vinyl sulfonic acid, and 0.2 g of potassium persulfate into the reaction solution, reflux and stir at 90°C for 24 hours, then add 0.1 g of sodium borohydride and continue the reaction for 12 hours to obtain a modified graphene dispersion . The product was then isolated by suction filtration and washed 3 times with acetone / deionized water respectively. The product was dried at room temperature for 48 hours to obtain modified graphene.

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Abstract

The invention provides a graphene / polysiloxane composite coating material and a preparation method thereof. The method comprises the following steps: modifying the graphene surface with active groups by a chemical modification technique to obtain modified graphene, mixing the modified graphene with a silane compound, a dispersion medium, a non-essential comonomer and a non-essential accelerator, and carrying out hydrolytic condensation or hydrolytic condensation-free radical polymerization to generate a graphene / polysiloxane composite resin in situ; and mixing the resin with a non-essential blend resin, a non-essential curing agent, a non-essential solvent, a non-essential pigment and filler and a non-essential aid, and carrying out physical blending, amino epoxy addition reaction, Michael addition reaction and the like to form a film, thereby obtaining the graphene / polysiloxane composite coating material. The uniformly dispersed graphene lamellae and polysiloxane have strong interface effects, also have the gas / liquid barrier and heat shielding effects, and endow the coating with excellent corrosion resistance, flame retardancy and the like, thereby greatly enhancing the mechanical properties, corrosion resistance, scratch resistance, wear resistance and the like of the coating.

Description

technical field [0001] The invention relates to the fields of chemical industry and optoelectronics, in particular to a graphene / polysiloxane composite coating material and a preparation method thereof. Because of the addition and in-situ compounding of graphene, the graphene / polysiloxane composite coating exhibits excellent wear resistance, scratch resistance, weather resistance, flame retardancy, antistatic property, and corrosion resistance, and can be widely used Applied to the surface of various metals, plastics, wood, concrete, glass and their mixed substrates to enhance the protection. Background technique [0002] Organopolysiloxane coating is an organic-inorganic hybrid coating material formed by silane compound precursor through hydrolysis polymerization reaction under certain conditions, with Si-O-Si inorganic network structure as the skeleton. It is rich in silicon hydroxyl groups, which can form covalent bonds through condensation reaction with metal surface hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/07C09D183/06C09D183/08C09D5/18C09D5/24C09D5/08
CPCC08K3/04C08K9/04C08K9/06C08K2201/011C08L2201/02C08L2201/04C08L2205/02C08L2205/03C09D5/08C09D5/18C09D5/24C09D7/61C09D7/62C09D7/65C09D183/04C09D183/06C09D183/08C08L63/00C08L75/04C08K13/06C08L67/08C08L67/00C08L33/00
Inventor 游波胡航李滨
Owner FUDAN UNIV
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