Load vegetale porous, micronized, it is not very dense, of particle size and low specific surfaces 27, physical and hydraulic; method of preparation and use

摘要

The invention, as a new industrial product, relates to a porous, micronized, low density vegetable filler with a controlled particle size and low specific physical and hydraulic surfaces. This vegetable filler is characterized in that (1) with a residual moisture content below 20 % and preferably below 15 %, it has (1a) a d95 particle size of less than 200 micrometers (meaning that at least 95 % by weight of the particles of said vegetable filler will pass through a square mesh sieve with openings of 200 x 200 micrometers), (b) a specific physical surface of less 2 m2/g, (c) a specific hydraulic surface of less 2 m2/g, and (d) a density of less than 500kg/m3 and preferably less than or equal to 300kg/m3; and, (2) it will have been obtained by grinding/micronization at a temperature lower than 150 DEG C and preferably at a temperature lower than or equal to 100 DEG C. This micronized vegetable filler is useful in the fields of pulp, paper, cardboard, and nonwovens on the one hand, and in the fields of composites, paints, coatings and construction materials on the other.