C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
261/45, 261/84
C08K 3/32 (2006.01)
Patent
CA 1081718
ABSTRACT OF THE DISCLOSURE The disclosed process for making cast vegetable/mineral structural products having flame retardant properties utilise a major volume portion of ligneus plant fragments such as soft- and hardwoods, sugarcane, cereal and fiber plant stalks, and a minor volume proportion of a mineral binder deposit comprised of magnesium or calcium oxyphosphates and inert filler particles. Fragments having thicknesses ranging from 0.3 mm to 8mm including chips, shavings, strips, strands, fibre bundles, slivers, fibres and peeled and sawn veneer sheets, have applied to their surfaces an aqueous solution of ammonium p phosphate or soluble acid phosphate salt supplying from 0.15 to 0.40 parts of P2O5 as phosphate ion per part of fragments by weight, and particulate cement solids comprised of MgO or CaO or Mg(OH)2 or Ca(OH)2 or MgCO3 or CaCO3 ranging from 0.25 to 1.0 part per part of fragment, and from 0.01 to 0.80 parts of inert filler particles and the mixture is molded and held under predetermined compaction pressure until the product has rigidified, in about 10 minutes' time. Greater flame retardation results when the phosphate solution is mainly absorbed into the fragment surfaces before the cement solids are dusted onto the wet surfaces. At low compaction pressures the product has low bulk density and an open structure. Use of MgO of density 2.8 or higher of -100 to +250 mesh size and ammonium polyphosphates of analysis 10:34:00 or 11:37:00 with air-dry or oven-dry fragments in amount sufficient to retain on drying impregnated salt loads up to 65 milligrams per cc of ligneus material obtains strong, highly fire-retardant product. The process is practically immune to cement poisoning sugars and polyphenolics which were found to be detrimental to other cement mixes.
299288
Filipkowski R.j.
Paszner Laszlo
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