Composite material based on polyamide and submicronic mineral particles
AssigneeRhodia Chimie
InventorsDominique Dupuis, Patrice Lacombe, Joel Varlet
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Abstract
The invention relates to a composite material comprising a polyamide matrix and mineral fillers of submicron size. The filler used comprises at least one core and a surface layer for modifying its dispersibility in the matrix or in the medium for synthesizing the matrix. The filler allows the thermomechanical properties of the polyamide to be modified.
Claims22
Process for preparing a composite material comprising a polyamide matrix obtained by polycondensation of a diamine with a dicarboxylic acid and mineral submicron particles, characterized in that it comprises the following steps:
- a) introduction of the particles, comprising a core and an at least discontinuous layer of an oxide, hydroxide or hydrated oxide of a metal, whose isoelectric point is higher than that of the core, into an aqueous solution comprising a salt of the diamine and of the dicarboxylic acid,
- b) polycondensation of the polyamide to the desired degree of polymerization.
Process according to one of the preceding claims, characterized in that the diamine is hexamethylenediamine.
Process according to one of the preceding claims, characterized in that the dicarboxylic acid is adipic acid.
Process according to one of the preceding claims, characterized in that the layer on the particle is formed from an oxide, hydroxide or hydrated oxide of zirconium.
Process according to one of the preceding claims, characterized in that the particles are introduced in the form of a sol into the aqueous solution comprising the salt of diamine and of dicarboxylic acid.
Composite material comprising a matrix based on polyamide and on mineral submicron particles, characterized in that the polyamide is obtained by polycondensation of a diamine with a dicarboxylic acid, and in that the particles comprise a silica-based core and an at least discontinuous layer of an oxide, hydroxide or hydrated oxide of a metal, whose isoelectric point is greater than that of the core.
Silica-based mineral submicron particles, characterized in that they comprise a silica-based core and an at least discontinuous layer of an oxide, hydroxide or hydrated oxide of zirconium.
Dependencies are inferred from the claim text.