CALCIUM PHOSPHATE HYDRAULIC CEMENT COMPOSITION

PURPOSE:To contrive improvement in setting hardenability, by blending alpha-type calcium tertiary phosphate with calcium secondary phosphate hydrate at a specific molar ratio of Ca/P. CONSTITUTION:A change of alpha-type calcium tertiary phosphate Ca3(PO4)2 into apatite and octacalcium phosphate (OCP...

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Bibliographische Detailangaben
1. Verfasser:	KADOMA HIDEKI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE DISINFECTION, STERILISATION, OR DEODORISATION OF AIR HUMAN NECESSITIES HYGIENE LIME, MAGNESIA MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METALLURGY METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES REFRACTORIES SLAG TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PURPOSE:To contrive improvement in setting hardenability, by blending alpha-type calcium tertiary phosphate with calcium secondary phosphate hydrate at a specific molar ratio of Ca/P. CONSTITUTION:A change of alpha-type calcium tertiary phosphate Ca3(PO4)2 into apatite and octacalcium phosphate (OCP) is advanced within a weak acidic range in water. On the other hand, a change of calcium secondary phosphate dihydrate (CaHPO4.2H2O) into the apatatite and OCP is similarly advanced within a weak acidic to basic range in water. The alpha-type calcium tertiary phosphate is blended with calcium secondary phosphate dihydrate at 1.20-1.47 molar ratio of Ca/P to form a blended powder, which is then kneaded with water and kept. In the process, since the pH condition required for hydrating reaction of both mutually complements, advance of the hydrating reaction is accelerated. Thereby setting hardenability of a hydraulic cement composition is improved.