Graphene modified nylon 66 composite material and preparation method thereof

Abstract

The invention discloses a graphene modified nylon 66 composite material and a preparation method thereof. The graphene modified nylon 66 composite material is prepared from nylon 66 and a polyvinyl alcohol / graphene oxide coating material in the mass ratio of (300-450): (8-30) through mixing, drying, melting extrusion by a double-screw extruder and cooling, wherein the polyvinyl alcohol / graphene oxide coating material is prepared from polyvinyl alcohol, graphene oxide and water. The graphene modified nylon 66 composite material and the preparation method thereof have the advantages that the preparation process is simple, convenient and easy to conduct, the graphene oxide / polyvinyl alcohol coating material coats the surfaces of nylon 66 aggregates through two-step mixing, a series of complicated operation processes in the prior art such as copolymerization, polymer dissolution and precipitation and waste liquor treatment are omitted, the graphene modified nylon 66 composite material withgood dispersity is prepared, and the preparation method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a graphene-modified nylon 66 composite material and a preparation method thereof. Background technique [0002] Nylon 66, whose scientific name is polyamide 66, is the largest variety series in engineering plastics, with many excellent properties, but there are strong polar repeating units - amide groups in the main chain of its molecule, which causes it to lose weight in the size of the product. It is unstable, and its many properties are degraded in water or humid environment, so its application is limited. [0003] As one of the important derivatives of graphene, graphene oxide contains many oxygen-containing functional groups such as hydroxyl group and carboxyl group. As such, graphene oxide can be well dispersed in nylon 66 matrix and have a good interaction with it. After thermal reduction, graphene can exhibit excellent mechanical properties and ba...

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Problems solved by technology

[0004] At present, the methods for modifying nylon 66 by graphene mainly include in-situ polymerization, solution mixing and melt blending. Although these methods can already be operated in the laboratory, there are some shortcomings in the above methods, such as: original The preparation process of the position polymerization method is cumbersome and costly; the solution mixing method requires the use of organic solvents, high energy consumption, heavy environmental burden, and high cost; the melt blending method generally prepares the masterbatch through the first two methods, and then performs melt extrusion , so that it also has the shortcomings of the first two methods, and these shortcomings make it impossible to realize large-scale industrial production

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