A method of producing a pressed board product of a predetermined thickness specification includes subjecting a predetermined mass per unit area of a precursor mixture to pressing in a press, at a predetermined pressing force with or without the application of heat. The precursor mixture comprises particulate material, an alkali metal silicate, polyvinyl alcohol, and a geopolymerisation promoter for promoting geopolymerisation of the alkali metal silicate. The method includes, prior to and/or during and/or after subjecting the precursor mixture to the pressing, allowing at least partial setting by geopolymerization of the alkali metal silicate.
A method of binding small particles, which includes forming a mixture of the small particles and a first agent that is a polyvinyl alcohol, a second agent that comprises one or more of an aldehyde, glutaraldehyde and glyoxal; and a third agent that is a mineral acid.
C08L 29/04 - Alcool polyvinyliqueHomopolymères ou copolymères d'esters partiellement hydrolysés d'alcools non saturés avec des acides carboxyliques saturés
The invention provides a binder composition for agglomerating small particles, the binder composition comprising a mixture of a first aqueous solution, which comprises a fully or partially hydrolysed aqueous polyvinyl alcohol in a proportion of from 0.5% to 10% dry mass; and a second aqueous solution, which comprises one or a combination of guar and galactomannan in a proportion of from 0.1 to 3% dry mass.
C08L 29/04 - Alcool polyvinyliqueHomopolymères ou copolymères d'esters partiellement hydrolysés d'alcools non saturés avec des acides carboxyliques saturés
C08J 3/07 - Production de solutions, dispersions, latex ou gel par d'autres procédés que ceux utilisant les techniques de polymérisation en solution, en émulsion ou en suspension dans un milieux aqueux à partir de solutions de polymères
B29B 9/12 - Fabrication de granulés caractérisés par la structure ou la composition
B29B 9/08 - Fabrication de granulés par agglomération de particules plus petites
The invention provides a method of preparing a fibrous composite material precursor composition for preparing a fibrous composite material artefact. The method includes forming an aqueous composition of fibrous material, gypsum, and one or both of a cellulose and a hydrocolloidal substance. The method also includes generating a foam by foaming a 2.5% to 5% by mass concentration of a partially hydrolysed polyvinyl alcohol solution in water. The foam is introduced into the aqueous composition, thereby obtaining the fibrous composite material precursor composition.
C04B 28/14 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des ciments de sulfate de calcium
C04B 38/02 - Mortiers, béton, pierre artificielle ou articles de céramiques poreuxLeur préparation par addition d'agents chimiques gonflants
The invention provides a construction element comprising an artefact obtained by pressing, cold or at ambient temperature, a non-sticky free-flowing granular cementitious or gypsum-based precursor composition, causing the granules of the precursor composition to cohere and form the artefact.
B28B 3/00 - Fabrication d'objets façonnés en utilisant des pressesPresses spécialement adaptées à ce travail
C04B 28/00 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates
E04C 2/04 - Éléments de construction de relativement faible épaisseur pour la construction de parties de bâtiments, p. ex. matériaux en feuilles, dalles ou panneaux caractérisés par des matériaux spécifiés en béton ou autre matériau analogue à la pierre en ciment d'amiante
The invention provides a method of stabilizing a body of particulate material. The method includes applying at least one alkali metal silicate to at least one of exposed surface particulate material and subsurface particulate material of a body of particulate material. A stabilized body of particulate material is obtained by allowing or artificially or otherwise promoting geopolymerization of the alkali metal silicate, or by allowing the alkali metal silicate to set by desiccation. The method is subject to the proviso that it does not include applying a lignosulphonate or spent soda liquor to the body of material in obtaining the stabilized body of particulate material.
C09K 17/12 - Silicates solubles dans l'eau, p. ex. verre soluble
C09K 17/46 - Composés inorganiques mélangés avec des ingrédients actifs organiques, p. ex. accélérateurs le composé inorganique étant un silicate soluble dans l'eau
E02D 3/12 - Consolidation par mise en place dans le sol de produits solidifiants ou obturant les pores
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