Process for treating porous materials and products obtained
AssigneeS. A. Eternit
InventorsMarc Della Faille, Pierre Delvaux, Pierre Godard, Jean Pierre Mercier
Life of this patent
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Abstract
A method for processing porous materials with at least one water-insoluble polymerizable compound and the products obtained, said method comprising the following steps in successive order: impregnating a porous material, especially one consisting essentially of a hydraulic binder and a granular or fibrous filler, with said compound; fully covering the thus impregnated material with an aqueous solution of a salt which precipitates when contacted with the hydraulic binder; and polymerizing the compound in the impregnated material while covered with the saline solution.
Claims16
A method for processing porous materials comprising in successive order the steps of:
- impregnating, with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic binder and a filler selected from the group consisting of granular and fibrous fillers;
- fully covering the thus impregnated material with an aqueous solution of a salt which does not substantially modify the inherent viscosity of water and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution is a solution of a salt which precipitates when contacted with said hydraulic binder in said material, said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature.
A method for treating porous materials comprising in successive order the steps of:
- impregnating with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic binder and a filler selected from the group consisting of granular and fibrous fillers;
- fully covering the impregnated material thus obtained with an aqueous solution of a salt having the generic formula
- MX
- where M is a cation and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates;
- and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution is a solution of a salt which precipitates when contacted with said hydraulic binder in said material, said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties of said material is improved.
A method for treating porous materials comprising in successive order the steps of:
- impregnating, with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic calcareous binder and a filler selected from the group consisting of granular and fibrous fillers said material having a mean pore radius of at least 160A;
- fully covering the impregnated material thus obtained with an aqueous solution of a salt having the generic formula
- MX
- where M is a cation selected from the group consisting of ammonium, alkali metals, and alkaline-earth metals;
- and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates;
- and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution has a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties of said material is improved.
A method for treating porous materials comprising in successive order the steps of:
- impregnating, with at least one water-insoluble polymerizable compound a porous material consisting essentially of a hydraulic calcareous binder and a filler selected from the group consisting of granular and fibrous fillers, said material having a mean pore radius of at least 160A;
- fully covering the impregnated material thus obtained with an aqueous solution of a salt selected from the group consisting of alkali-metal phosphates and ammonium phosphates;
- and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution has a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties and resistance to efflorescence formation of said materials are improved.
A polymer impregnated porous material consisting essentially of a porous asbestos cement having a mean pore radius of at least 160 A impregnated with a water-insoluble polymerized monomer, said monomer being polymerized within said asbestos cement at a polymerization temperature while said impregnated cement is covered by an aqueous solution of a salt having the generic formula
- MX
- where M is a cation selected from the group consisting of ammonium, alkali metals, and alkaline-earth metals;
- and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates said solution having said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature.
Dependencies are inferred from the claim text.