Polypropylene and carbon nano-tube composite type foam material

Abstract

The invention discloses a polypropylene and carbon nano-tube composite type foam material, and belongs to the technical field of foam materials. The polypropylene and carbon nano-tube composite type foam material comprises polypropylene materials and modified sodium bicarbonate. Carbon nano-tubes are added into the polypropylene materials to form carbon nano-tube reinforcement polypropylene composite materials. The polypropylene and carbon nano-tube composite type foam material comprises, by weight, 85-90 parts of polypropylene, 2-8 parts of compatibilizers, 0.5-10 parts of carbon nano-tubes and 0.5-2 parts of other additives. A weight ratio of the modified sodium bicarbonate to the carbon nano-tube reinforcement polypropylene composite materials is 0.5-5:95-99.5. The polypropylene and carbon nano-tube composite type foam material has the advantages that the raw material cost can be saved, and the polypropylene and carbon nano-tube composite type foam material which is a uniform and compact polypropylene micro-foam composite material with tiny cells and good mechanical properties further can be obtained.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a composite foaming material of polypropylene and carbon nanotubes. Background technique [0002] Under the premise that the current trend of lightweight in the automotive industry is increasing, polypropylene micro-foamed composite materials have become one of the ideal choices for lightweight composite materials. Polypropylene is a linear crystalline polymer, which hardly flows below the melting point, and the viscosity drops sharply above the melting point, so it is difficult to support the growth of bubbles, which easily leads to the collapse and rupture of the cells. In addition, the specific heat capacity of polypropylene is large, which makes When it changes from a molten state to a crystalline state, it will release a large amount of heat, which will further reduce the viscosity of the melt, which is not conducive to the formation of an excellent cel...

AI Technical Summary

Problems solved by technology

Polypropylene is a linear crystalline polymer, which hardly flows below the melting point, and the viscosity drops sharply above the melting point, so it is difficult to support the growth of bubbles, which easily leads to the collapse and rupture of the cells. In addition, the specific heat capacity of polypropylene is large, which makes When it changes from a molten state to a crystalline state, it will release a large amount of heat, which will further reduce the viscosity of the melt, which is not conducive to the formation of an excellent cell structure, and will also affect the mechanical properties of foamed products, limiting its wide application.