Imi Tami Institute for Research and Development Ltd.

Ezrah Hanuka

Ron Frim

Eyal Ginzberg

Gideon Shikolsky

Basam Masri

Yelena Gorelik

Aharon Weissman

Eyal Yehihel Vultz

Dorit Perle

A cement mix for preparation of a magnesium silico-phosphate cement (MSPC) with an altered hardening rate is provided. The cement mix comprises on the order of 1% of an [MF]salt or acid. Upon addition of water, the mix produces a final set cement that has similar physical properties to those of a cement prepared from a mix lacking the additive, but with a significantly altered setting time. In some embodiments of the invention, the additive is provided in the form of a coating for the MgO component of the mix. In preferred embodiments, HTiF, NaTiFand/or KTiFare used as retarders, while KAlFis used as an accelerant. Other embodiments use M'MFcompounds wherein M&#x2032; is an alkali metal, an alkaline earth metal, or H, and M is chosen from inter alia Ti (n=2), Zr (n=2), P (n=1), Al (n=3), and Sb (n=1).

Cement mixes containing additives for altering the hardening rate of chemically bonded silico-phosphate cements and methods therefor

A method is provided for advantageously altering the rate of hardening of a magnesium silico-phosphate cement (MSPC). Addition of on the order of 1% of an [MF]salt or acid to an MSPC, obtained by adding the salt or acid either directly to the dry mix or to the water used to effect hydraulic hardening of the cement, significantly alters the hardening rate without adversely affecting the physical properties of the final set cement. In preferred embodiments, NaTiFand/or KTiFare used as retardants, while KAlFis used as an accelerant. Other embodiments use M'-MFcompounds wherein M&#x2032; is an alkali metal, an alkaline earth metal, or H, and M is chosen from inter alia Ti (n=2), Zr (n=2), Si (n=2), P (n=1), Al (n=3), and Sb (n=1).

Additives for altering the hardening rate of chemically bonded silico-phosphate cements and method therefor

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Haifa, Israel

Ezrah Hanuka