ACCELERATOR

• Main Authors: BUERGE, CHRISTIAN, KURZ, CHRISTOPHE, MARAZZANI, BEAT, MAEDER, GILBERT, WOMBACHER, FRANZ, SULSER, UELI
• Format: Patent
• Language: English; French; German
• Published: 03.07.2013
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

Producing a setting and hardening accelerator for hydraulic binders, comprises (i) reacting a calcium compound with a silicon compound, and (ii) adding a phosphonic acid derivative (I). Producing a setting and hardening accelerator for hydraulic binders, comprises (i) reacting a calcium compound with a silicon compound, and (ii) adding a phosphonic acid derivative of formula (O=P((OX) 2)-R1-{R2-(R3) n-[AO] q-R4} m) (I). X : H +>, alkali metal ion, alkaline metal ion, bi- or tri-valent metal ion, ammonium ion, organic ammonium group or -(R3) n-[AO] q-R4; R1 : 1-10C-organic residue; R2 : -C(=O)-O-, -C(=O)-N- or -P(=O)(OH)-O-; R3 : 1-6C-alkyl; R4 : H, alkyl (preferably 1-20C-alkyl) or alkylaryl (preferably 7-20C-alkylaryl); A : 2-4C-alkylene, q : 2-300, preferably 3-10; m : 1-4, preferably 3; and n : 0-1. Independent claims are included for: (1) the setting and hardening accelerator produced by the process; (2) a binder-containing mixture comprising at least one hydraulically setting binder and the setting and hardening accelerator; and (3) accelerating the setting and hardening of a hydraulic binder comprising adding the setting and hardening accelerator ( 0.01-30 wt.%) to a mixture comprising the hydraulic binder.