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US 12,448,330 B2Granted
Composition treated by silicone and its use
AssigneeWacker Chemie AG
InventorsDmitry Davydov, Wei Cai, Fanghua Lei, Zheng Li
Life of this patent
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Abstract
The present invention relates to the use of an additive which is an aqueous system of specific polyether silicones in clinker and cement preparation. The additive improves the grinding efficiency and also results in an improvement in the cured properties of cementitious compositions employing cement so produced.
Claims11
A limestone-containing composition, comprising:
- cement produced by grinding a mineral mixture and/or clinker treated with a silicone-containing grinding aid;
- wherein the limestone in the cement is present in an amount greater than or equal to 3 wt %, based on the total weight of the cement,
- the silicone-containing grinding aid comprising a silicone of formula 1, which is a polyether modified polysiloxane,
- wherein each R is the same or different and represents a C1-C40 monovalent hydrocarbon group, or a C1-C40 monovalent hydrocarbon group containing hetero atoms,
- R1 represents a divalent hydrocarbon group having 1-40 carbon atoms,
- R2 represents CH2CH3, COH(CH3)2, COCH3, CH3 or H,
- EO represents CH2CH2O, PO represents CH2(CH3)CH2O,
- a is an integer from 0-12, b is an integer selected from 0-3, a+b≥1;
- x is an integer between 0-3, y is an integer between 1-3, x+y≥1.
6 more elements
A method for improving the efficiency of clinker or cement grinding, comprising the steps of:
- treating clinker or a mineral mixture with the silicone of formula 1 during a ball mill milling process, wherein the amount of limestone in the clinker or in the mineral mixture is greater than or equal to 3 wt %, based on the total weight of the clinker or cement.
Dependencies are inferred from the claim text.