Production of nanoparticles, especially nanoparticle composites, from powder agglomerates

摘要

The invention relates to a method for producing particulate composite materials. According to the method, solid inorganic or organic particle agglomerates or particle aggregates that are provided in a dry state, particularly in powder form, are first reduced in size in the gas phase or in a gaseous carrier medium in the presence of organic matrix particles by applying energy. The obtained comminuted particles are dispersed into the organic matrix particles, especially embedded thereinto and/or attached thereto. The composite materials produced in said manner can be used in many different ways and are suitable in particular for use in a large variety of plastic materials, coating materials, paints, and lacquers, especially coating powders, to modify properties during use in the corresponding products and similar.

主权项

1. A process for producing particulate composite materials, said process comprising the process steps of:
(i) first subjecting solid, inorganically or organically based particle agglomerates or particle aggregates which are in a dry state to comminution in a gaseous phase or in a gaseous carrier medium and in the presence of organically based matrix particles, with input of energy, and (ii) subsequently dispersing the resulting comminuted particles into the organically based matrix particles, thereby attaching them thereto and incorporating them therein, wherein:
the input of energy is accomplished by introduction of impact forces and shearing forces,the total energy input over the process duration is 10 to 106 kJ,the proportion of organically based matrix particles, on the one hand, to comminuted particles dispersed therein, on the other hand, varies in the range from 99.9:0.1 to 30:70,the process is carried out as a dry dispersing operation in solid phase, the process being carried out below the melting temperature or the melting range and above the glass transition temperature of the organically based matrix particles and below the melting temperature of the inorganically or organically based particle agglomerates or particle aggregates, andthe process is carried out in a fluidized bed in a stator/rotor device, wherein the device comprises, in addition to stator and rotor, a multiplicity of impact-plates for the comminution of the agglomerates or aggregates on their impact, wherein the starting agglomerates or starting aggregates have average particle sizes in the range from about 0.1 μm to about 2,000 μm, wherein the comminuted particles have average particle sizes in the range of from about 1 nm to about 500 nm, wherein the organically based matrix particles have average particle sizes in the range of from about 0.1 μm to about 500 μm.