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US 2019/0084881 A1Published application
Cement additive, cement composition, and raw material for cement additive
AssigneeNippon Shokubai Co., Ltd.
InventorsTakeshi Takayama, Kimiaki Nishimura
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Abstract
Provided is a cement additive that can significantly improve the strength of a cured product of a cement composition over a long time period. Also provided is a cement composition including such cement additive. The cement additive of the present invention includes: a compound (A) having a weight-average molecular weight of more than 3,000, and having a structure in which 5 moles or more of an alkylene oxide is added to 1 mole of a polyhydric alcohol; and an alkanolamine compound (B).
Claims16
A cement additive, comprising:
- a compound (A) having a weight-average molecular weight of more than 3,000, and having a structure in which 5 moles or more of an alkylene oxide is added to 1 mole of a polyhydric alcohol;
- and
- an alkanolamine compound (B),
- wherein:
- the compound (A) is free of a carboxyl group;
- and
- when the compound (A) is an adduct of an alkylene oxide to active hydrogen bonded to an amino group of polyethyleneimine, the adduct of an alkylene oxide to active hydrogen bonded to an amino group of polyethyleneimine has a weight-average molecular weight of 10,000 or more.
4 more elements
A cement composition, comprising:
- a compound (A) having a weight-average molecular weight of more than 3,000, and having a structure in which 5 moles or more of an alkylene oxide is added to 1 mole of a polyhydric alcohol;
- and
- an alkanolamine compound (B),
- wherein:
- the compound (A) is free of a carboxyl group;
- and
- when the compound (A) is an adduct of an alkylene oxide to active hydrogen bonded to an amino group of polyethyleneimine, the adduct of an alkylene oxide to active hydrogen bonded to an amino group of polyethyleneimine has a weight-average molecular weight of 10,000 or more.
4 more elements
Dependencies are inferred from the claim text.