Construction chemical compositions comprising a bisulfite adduct of glyoxylic acid
The present invention relates to construction chemical compositions comprising a bisulfite adduct of glyoxylic acid or a salt or mixed salt thereof and an inorganic binder. The composition is useful as a hydration control agent of the inorganic binder.
1. A construction chemical composition, comprising a bisulfite adduct of glyoxylic acid or a salt or mixed salt thereof and an inorganic binder.
2. The construction chemical composition of claim 1 , wherein the bisulfite adduct is of formula (I):
wherein:
R1 is —COOX; and
X is, independently of one another, H or a cation equivalent K a wherein K is selected from the group consisting of an alkali metal, alkaline earth metal, zinc, iron, ammonium, or phosphonium cation, as mixtures thereof, and a is 1/n wherein n is the valence of the cation.
3. The construction chemical composition of claim 1 , wherein X is H, Na, K, Li or mixtures thereof.
4. The construction chemical composition of claim 1 , wherein the inorganic binder is selected from the group consisting of a hydraulic binder, a calcium sulfate-based binder, and a mixture thereof.
5. The construction chemical composition of claim 4 , wherein the hydraulic binder is an aluminate-containing cement.
6. The construction chemical composition of claim 5 , wherein the aluminate-containing cement is selected from the group consisting of a CEM cement, an aluminate cement, a sulfoaluminate cement, and mixtures thereof.
7. The construction chemical composition of claim 6 , wherein the aluminate-containing cement is CEM cement.
8. The construction chemical composition of claim 5 , wherein the aluminate-containing cement is a mixture of CEM cement and aluminate cement, or a mixture of CEM cement and sulfoaluminate cement, or a mixture of CEM cement, high alumina cement and sulfoaluminate cement.
9. The construction chemical composition of claim 4 , wherein the inorganic binder is calcium sulfate dihydrate, calcium, sulfate hemihydrate or anhydrite and mixtures thereof.
10. The construction chemical composition of claim 5 , wherein the inorganic binder is a mixture of an aluminate-containing cement and a calcium sulfate-based binder.
11. The construction chemical composition of claim 1 , further comprising at least one additive.
12. The construction chemical composition of claim 11 , wherein at least one additive is selected from the group consisting of inorganic carbonates, alkali metal sulfates, latent hydraulic binders, dispersants, hardening accelerators, hardening retarders, fillers, essentially aluminate-free cement, and aggregates or a mixture of two or more thereof.
13. The construction chemical composition of claim 12 , wherein the additive is at least one polymeric dispersant, phosphorylated polycondensation product or a sulfonic acid and/or sulfonate group containing dispersant.
14. The construction chemical composition of claim 13 , wherein the dispersant is a sulfonic acid and/or sulfonate group containing a dispersant selected from the group consisting of lignosulfonates, melamine formaldehyde sulfonate condensates, β-naphthalene sulfonic acid condensates, sulfonated ketone-formaldehyde-condensates, and copolymers comprising sulfo group containing units and/or sulfonate group-containing units.
15. The construction chemical composition of claim 12 , wherein the additive is selected from the group consisting of essentially aluminate-free cement, fillers, and aggregates or a mixture of two or more thereof.
16. The construction chemical composition of claim 12 , wherein the inorganic carbonate is an alkali metal carbonate or alkaline earth metal carbonate.
17. The construction chemical composition of claim 12 , wherein the additive is a hardening retarder.
18. The construction chemical composition of claim 1 , wherein the weight ratio of the inorganic binder to the bisulfite adduct is in the range from 10:1 to 10000:1.
19. The construction chemical composition of claim 1 , wherein the weight ratio of the inorganic binder to the bisulfite adduct is in the range from 1:10 to 1:10000.
20. A building product, comprising the construction chemical composition of claim 1 .
21. The building product of claim 20 , wherein a weight ratio of the inorganic binder to the bisulfite adduct is in the range from 10:1 to 1000:1.