Hydraulic composition

Patent metadata

Field	Value
Publication number	US-10294158-B2
Application number	US-201815861317-A
Country	US
Kind code	B2
Filing date	Jan 3, 2018
Priority date	Jan 20, 2017
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A hydraulic composition comprising an AE agent, water-soluble cellulose ether, defoamer, cement, water, and aggregate is provided. The AE agent contains a fatty acid-based surfactant consisting of a fatty acid, alkali metal salt, lower alkylamine salt or lower alkanolamine salt thereof and a nonionic surfactant consisting of a polyoxyethylene phenyl ether. The hydraulic composition has frost damage resistance and experiences little bleeding.

First claim

The invention claimed is:

1. A hydraulic composition comprising at least an AE agent, a water-soluble cellulose ether, a defoamer, cement, water, and an aggregate, the AE agent comprising a fatty acid-based surfactant consisting of a fatty acid, an alkali metal salt, lower alkylamine salt or lower alkanolamine salt thereof and a nonionic surfactant consisting of a polyoxyethylene phenyl ether,
said fatty acid having the general formula (1):

wherein R 1 is a C 12 -C 24 alkyl or alkenyl group,
said polyoxyethylene phenyl ether having the general formula (2):

wherein R 2 is a C 8 or C 9 alkyl group and n is an integer of 1 to 50, and said defoamer comprising one or more selected from the group consisting of oxyalkylene, silicone, alcohol, mineral oil, fatty acid, and fatty acid ester-based defoamers, with the proviso that said oxyalkylene defoamer does not include (poly)oxyalkylene (alkyl) aryl ethers.

2. The hydraulic composition of claim 1 wherein the water-soluble cellulose ether is hydroxypropyl methyl cellulose or hydroxyethyl methyl cellulose.

3. The hydraulic composition of claim 2 wherein the hydroxypropyl methyl cellulose has a ratio (A/B) of a molar fraction of methoxy-substituted hydroxypropyl (A) to a molar fraction of methoxy-free hydroxypropyl (B) in the range from 0.2/1 to 1.0/1.

4. The hydraulic composition of claim 2 wherein the hydroxyethyl methyl cellulose has a ratio (A/B) of a molar fraction of methoxy-substituted hydroxyethyl (A) to a molar fraction of methoxy-free hydroxyethyl (B) in the range from 2.0/1 to 3.0/1.

5. The hydraulic composition of claim 1 wherein the AE agent is present in an amount of 0.0001 to 0.5% by weight based on the cement.

6. The hydraulic composition of claim 1 which has an air void spacing factor of 25 to 250 μm.

Assignees

• Shinetsu Chemical Co

Inventors

• Yamakawa Tsutomu
• Konishi Hidekazu

Classifications

• C04B2103/601

  Agents for increasing frost resistance · CPC title

• C04B2103/406

  non-ionic · CPC title

• C04B2103/0083

  Bleeding-preventing agents · CPC title

• C04B24/121

  Amines, polyamines · CPC title

• C04B24/383 Primary

  Cellulose or derivatives thereof · CPC title