A METHOD FOR MAKING A NATURAL BINDER FOR MANUFACTURING OF COMPOUND ARTICLES

The method of preparing a natural binder for use in manufacturing composite articles comprises: mixing a magnesium cement or Sorel cement, comprising caustic magnesia and a solution of magnesium chloride or magnesium sulfate, with a mixture of natural components reacting with one another and with fibers and aggregates imparting physical and mechanical properties; from such mixing step, obtaining a composite of cross-linked plastic materials which for waterproofing and protection of magnesium oxysulfate crystals obtained from a reaction of said magnesium cement, to an amount of 10% to 80% based on the dry magnesium oxide contents in the Sorel cement; the mixture of natural components comprising at least: a mixture of technical cardanol and a leachate obtained from demolition of cellulose; a terpenoid resin; a fluidizer selected from water or an epoxidized monounsaturated fatty acid or an eopoxidized polyunsaturated fatty acid.