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Graphene-block copolymer modified polyurethane amphoteric coating and preparation method thereof

A technology of block copolymer and polyurethane, applied in the direction of fireproof coatings, coatings, etc., can solve the problems of reducing the mechanical strength and mechanical properties of materials, poor hydrophilicity of polyurethane coatings, uneven dispersion, etc., to achieve enhanced flame retardancy and Effects of chemical stability, inhibition of secondary expansion, enhancement of toughness and flexural strength

Active Publication Date: 2019-11-22
肇庆中森新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the invention provides a graphene-block copolymer modified polyurethane amphoteric coating and its preparation method, which solves the problem of poor hydrophilicity of common polyurethane coatings, which leads to the ineffectiveness of polyurethane coatings in practical applications. The problem of poor adhesion on the coating during the process solves the problem of flexible molecular modified polyurethane materials, but the compatibility of flexible molecules in the material is poor, resulting in uneven dispersion, reducing the mechanical strength and The problem of mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of carboxyl-functionalized graphene: Add 200 mL of distilled water to a 500 mL beaker, then weigh 78 parts of graphene and 10 parts of oxalic acid in turn, and slowly add 12 parts of glacial acetic acid with a mass fraction of 98%, stirring evenly Finally, transfer the material in the beaker into a high-pressure hydrothermal reactor, and place it in a heating box of the reactor and heat it to 170°C for 24 hours. After the reaction, cool the material to room temperature, filter the solvent to obtain a solid mixture, and wash it with 4000 mL of distilled water. solid, and placed in an oven and heated to 90° C. to dry the water for 4 hours to obtain carboxyl-functionalized graphene component 1.

[0033] (2) Preparation of acrylamide-styrene block copolymer as an amphiphilic copolymer: Inert gas N is passed into a 2000mL three-necked bottle 2 Exhaust the air, then add 1000mL distilled water, weigh 28 parts of acrylamide and 68 parts of sodium lauryl sulfate ...

Embodiment 2

[0036] (1) Preparation of carboxyl-functionalized graphene: Add 200 mL of distilled water to a 500 mL beaker, then weigh 75 parts of graphene and 11 parts of oxalic acid in turn, and slowly add 14 parts of glacial acetic acid with a mass fraction of 98%, stirring evenly Finally, transfer the material in the beaker into a high-pressure hydrothermal reactor, and place it in a heating box of the reactor and heat it to 170°C for 20 hours. After the reaction, cool the material to room temperature, filter the solvent to obtain a solid mixture, and wash it with 3500 mL of distilled water. solid, and placed in an oven and heated to 90° C. to dry the water for 3 hours to obtain carboxyl-functionalized graphene component 2.

[0037] (2) Preparation of acrylamide-styrene block copolymer as an amphiphilic copolymer: Inert gas N is passed into a 2000mL three-necked bottle 2 Exhaust the air, then add 1000mL distilled water, weigh 30 parts of acrylamide and 65 parts of sodium lauryl sulfate ...

Embodiment 3

[0040] (1) Preparation of carboxyl-functionalized graphene: Add 200 mL of distilled water to a 500 mL beaker, then weigh 72 parts of graphene and 12 parts of oxalic acid in turn, and slowly add 16 parts of glacial acetic acid with a mass fraction of 98%, stirring evenly Finally, transfer the material in the beaker into a high-pressure hydrothermal reactor, and place it in the heating box of the reactor and heat it to 170 ° C for 22 hours. After the reaction, cool the material to room temperature, filter the solvent to obtain a solid mixture, and wash it with 3500 mL of distilled water solid, and placed in an oven heated to 90° C. to dry the water for 4 hours to obtain carboxyl-functionalized graphene component 3.

[0041] (2) Preparation of acrylamide-styrene block copolymer as an amphiphilic copolymer: Inert gas N is passed into a 2000mL three-necked bottle 2 Exhaust the air, then add 1000mL distilled water, weigh 31.5 parts of acrylamide and 62 parts of sodium lauryl sulfate...

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Abstract

The invention relates to the technical field of polyimide-cyanate ester amphoteric coatings, and discloses a graphene-block copolymer modified polyurethane amphoteric coating and a preparation methodthereof. The graphene-block copolymer modified polyurethane amphoteric coating comprises the following formula raw materials of carboxyl functionalized graphene, an acrylamide-styrene block copolymer,a catalyst, an end-capping reagent, an initiator, a polymerization monomer, a chain extender and the like. The graphene-block copolymer modified polyurethane amphoteric coating is prepared from an acrylamide-styrene block copolymer with high chemical energy, improves the glass transition temperature of the polyurethane, and enhances the flame retardance and the chemical stability of the polyurethane coating. A large number of fracture structures and the micro-crack elastic structures are formed on a polyurethane interface, so that the breaking energy generated during the deformation process can be absorbed, and the toughness and bending strength of the polyurethane coating are enhanced. The block copolymer is an amphiphilic polymer, and through the synergistic effect of the amphiphilic polymer and the hydrophilic carboxyl groups on the graphene, the hydrophilic and oleophylic amphipathy of the polyurethane coating is enhanced.

Description

technical field [0001] The invention relates to the technical field of polyimide-cyanate amphoteric coatings, in particular to a graphene-block copolymer modified polyurethane amphoteric coating and a preparation method thereof. Background technique [0002] Polyurethane coatings can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane coatings are composed of isocyanate prepolymers and hydroxyl resins. They can be divided into epoxy polyurethane, acrylic polyurethane, alkyd polyurethane, and poly Ether polyurethane, polyester polyurethane and other types have good mechanical properties, high solid content, and relatively good performance in all aspects. They are a type of coating with great development prospects. The main application directions are wood coatings and automobile repairs. Coatings, anti-corrosion coatings, floor paints, electronic coatings, special coatings, polyurethane waterproof coatings, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D151/08C09D153/00C09D5/18C09D7/62C08F283/00C08F220/22
CPCC08F283/008C08L2201/02C09D5/18C09D151/08C09D7/62C08L53/00C08K9/04C08K3/042C08F220/22
Inventor 蒋晓琴
Owner 肇庆中森新材料科技有限公司
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