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Powdery cement dispersant

A cement dispersant and powder technology, which is applied in the field of cement dispersants with high water-reducing performance, can solve problems such as sticking, operational cost, difficulty in forming disposable powder, etc., and achieves high water-reducing performance and easy handling. Effect

Inactive Publication Date: 2012-09-19
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like the technology described in Patent Document 1, it is necessary to use inorganic powders such as blast furnace slag and soot, so there are problems in terms of operability and cost
In addition, the obtained powdery cement dispersant may stick, making it difficult to form a powdery form with very good handling properties.
In addition, it does not have sufficient high water-reducing performance

Method used

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  • Powdery cement dispersant
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0095] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples. In addition, unless otherwise stated, "parts" and "%" in the examples are based on mass.

[0096]

[0097] Detector: Produced by Japan Waters Company, 410 differential refraction detector

[0098] Analysis software: produced by Japan Waters Corporation, Millenium Ver.3.21

[0099] Eluent: 115.6 g of sodium acetate trihydrate was dissolved in a mixture of 10999 g of water and 6001 g of acetonitrile, and then adjusted to pH=6 with acetic acid.

[0100] Eluent flow rate: 0.8ml / min

[0101] Packed column temperature: 40°C

[0102] Packing column: manufactured by Tosoh Corporation, TSK Guard Column SWXL+TSKgelG4000SWXL+G3000SWXL+G2000SWXL

[0103] Standard substance: polyethylene glycol, peak molecular weight (ピクッツプ molecular weight) (Mp) = 272500, 219300, 85000, 46000, 24000, 12600, 4250, 7100, 1470

[0104] Number of ...

manufacture example 1

[0115] [Manufacture example 1]: Manufacture of copolymer (1)

[0116] In a reactor equipped with a thermometer, a stirrer, a dropping device, a nitrogen inlet pipe, and a reflux cooler, add 76.9 g of distilled water and 149.3 mol of ethylene oxide 50 moles of adducts of 3-methyl-3-buten-1-ol g, heat up to 60°C. Next, a mixed solution of 0.23 g of hydrogen peroxide and 11.7 g of water was added, and 20.2 g of acrylic acid and 1.8 g of 3-mercaptopropionic acid were added dropwise over 3 hours. Stirring was continued for 1 hour after the dropwise addition, and sodium hydroxide was added to obtain an aqueous solution of copolymer (1) with pH = 6 and a weight average molecular weight of 37,000.

manufacture example 2

[0117] [Manufacture example 2]: Manufacture of copolymer (2)

[0118] 75.2 g of distilled water and 140.1 g of a 50-mol ethylene oxide adduct of allyl alcohol were added to a reactor equipped with a thermometer, a stirrer, a dropping device, a nitrogen gas introduction pipe, and a reflux cooler, and the temperature was raised to 60°C. Next, a mixed solution of 0.23 g of hydrogen peroxide and 11.7 g of water was added, and 21.0 g of acrylic acid and 1.8 g of 3-mercaptopropionic acid were added dropwise over 3 hours. Stirring was continued for 1 hour after the dropwise addition, and sodium hydroxide was added to obtain an aqueous solution of copolymer (2) with pH = 6 and a weight average molecular weight of 32,000.

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Abstract

The invention relates to an unbound, powdery and easy-to-dispose powdery cement dispersant having high water reduction property, comprising a multipolymer (I) having polyepoxide chains and at least one sulphonate composition (II) selected from lignosulphonate and naphthalene sulfonic acid formaldehyde condensation product, the average addition mole number m of the oxyalkylene base of the polyepoxide chain is no less than 10 and no more than 200. If the total amount of the multipolymer (I) and the sulphonate composition (II) is 100% by mass, the multipolymer (I) accounts for 90% to 30% by mass, and the sulphonate composition (II) accounts for 70% to 10% by mass.

Description

technical field [0001] The present invention relates to a powder cement dispersant, and more specifically, to a cement dispersant which is easy to handle as a powder and has high water-reducing performance. Background technique [0002] Cement dispersants are widely used in cement compositions such as grout, mortar, and concrete. [0003] The cement dispersant can improve the fluidity of the cement composition and reduce the moisture of the cement composition. Through this water reduction process, the strength and durability of the cured product can be improved. [0004] In recent years, cement dispersants containing polycarboxylic acid-based copolymers as main components have been proposed as cement dispersants. Cement dispersants mainly composed of polycarboxylate copolymers (polycarboxylate cement dispersants) exhibit high water-reducing performance. However, most polycarboxylate cement dispersants are aqueous solutions. Therefore, when preparing cement mortar containi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B24/18C04B24/22C04B103/40
CPCC04B24/165C04B2103/408
Inventor 林谷俊男
Owner NIPPON SHOKUBAI CO LTD