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Dispersant for hydraulic composition

A composition and hydraulic technology, applied in the field of dispersants for hydraulic compositions and hydraulic compositions, can solve the problems of high viscosity of concrete

Active Publication Date: 2009-02-18
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Furthermore, high-strength concrete is produced by stirring and mixing with a smaller water / hydraulic powder ratio (hereinafter referred to as water / cement ratio) than normal-strength (normal-strength) concrete. Concrete Viscosity Advanced Topics

Method used

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  • Dispersant for hydraulic composition
  • Dispersant for hydraulic composition
  • Dispersant for hydraulic composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0127] Examples are described below, but the scope of the present invention is not limited to the following examples.

manufacture example (R-1

[0129] 367 g of water was added to a glass-made reaction container (four-neck flask) with a stirrer, nitrogen substitution was performed, stirring, and it heated up to 80 degreeC in nitrogen atmosphere. 426 g of ω-methoxypolyethylene glycol monomethacrylate (the average added mole number of ethylene oxide is 23) (60.8% by weight of active ingredient, 35% by weight of water), 64.2 g of methacrylic acid It was mixed with 3.2 g of 3-mercaptopropionic acid, 85% phosphoric acid was added thereto, the pH was adjusted to 2.0, and the solution obtained by dissolving 11.4 g of ammonium persulfate in 64 g of water was added dropwise over 1.5 hours, respectively. After aging for 1 hour, a solution obtained by dissolving 5.7 g of ammonium persulfate in 32 g of water was added dropwise over 30 minutes, and aging was performed at the same temperature (80° C.) for 1.5 hours thereafter. After aging, 32% sodium hydroxide aqueous solution was added dropwise to neutralize to pH 6.0 to obtain pol...

manufacture example (R-2

[0132] 352 g of water was added to a glass-made reaction container (four-necked flask) with a stirrer, nitrogen substitution was carried out while stirring, and it heated up to 80 degreeC in nitrogen atmosphere. 397 g of omega-methoxy polyethylene glycol monomethacrylate (the average added mole number of ethylene oxide is 23) (the active ingredient is 60.8% by weight, and the moisture is 35% by weight), phosphoric acid mono-[( 123.4 g of phosphoric acid ester (A), which is a mixture of 2-hydroxyethyl) methacrylate and phosphate di-[(2-hydroxyethyl) methacrylate], and 6.1 g of 3-mercaptopropionic acid are mixed , Both of the solution obtained by dissolving 11.9 g of ammonium persulfate in 67 g of water were dripped over 1.5 hours, respectively. After aging for 1 hour, a solution obtained by dissolving 2.6 g of ammonium persulfate in 15 g of water was added dropwise over 30 minutes, and then aging was performed at the same temperature (80° C.) for 1.5 hours. After aging, 32% so...

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Abstract

Disclosed is a dispersing agent for hydraulic compositions which contains a polymer that is obtained by copolymerizing a specific monomer 1 such as an ethylene unsaturated carboxylic acid derivative having a polyoxyalkylene group, a phosphate monoester monomer 2, a phosphate diester monomer 3 and an unsaturated carboxylic acid monomer 4 at a pH of 7 or less.

Description

technical field [0001] The present invention relates to a dispersant for a hydraulic composition and a hydraulic composition. Background technique [0002] In the admixture for a hydraulic composition, there is a substance called a high-performance water reducer that has a good fluidity-imparting effect. Representative examples thereof include naphthalenesulfonic acid formaldehyde condensate salts (naphthalene-based), melaminesulfonic acid formaldehyde condensate salts (melamine-based), polycarboxylic acids having a polyoxyalkylene chain, and the like. However, in general, when a cement dispersant is used to prepare highly water-reducing concrete, there are problems such as significant slump loss, poor workability such as fillability and workability, and the like. [0003] Therefore, it has been proposed to use a water-soluble vinyl copolymer, which itself has a slump loss preventing performance, as a cement dispersant. [0004] Furthermore, when using high-billite cement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F290/06C04B28/02C04B103/40C08F220/26
Inventor 下田政朗浜田大辅滨井利正
Owner KAO CORP
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