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Copolymer and dispersant

A technology of copolymers and summaries, applied in transportation and packaging, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as deterioration of processability

Inactive Publication Date: 2007-08-08
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, their machinability deteriorates over time after the addition of water

Method used

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  • Copolymer and dispersant
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (polymer synthesis)

[0086] In a reaction vessel equipped with a nitrogen conduit, a condenser, and a stirring device, 8.5 g of IT-1 obtained in Synthesis Example 1, 1.5 g of acrylic acid, 40 g of water, 0.23 g of 30% by mass of sodium hydroxide aqueous solution, 0.2 g of ammonium persulfate and 0.1 g of mercaptopropionic acid, and heated in an oil bath at 80° C. for 2 hours under nitrogen flow. Subsequently, 2.45 g of a 30% by mass aqueous sodium hydroxide solution was added to the resulting solution to obtain an aqueous solution of the copolymer (P-1) having a pH of 6.3. The solid content of this aqueous solution was 19.5% by mass. The weight average molecular weight of P-1 was 14,800.

Embodiment 2

[0088] (polymer synthesis)

[0089]In a reaction vessel equipped with a nitrogen conduit, a condenser, and a stirring device, 8.5 g of IT-2, 1.5 g of acrylic acid, 40 g of water, 0.23 g of 30% by mass of sodium hydroxide aqueous solution, 0.2 g of ammonium persulfate and 0.1 g of mercaptopropionic acid, and heated in an oil bath at 80° C. for 2 hours under nitrogen flow. Subsequently, 2.20 g of a 30% by mass aqueous sodium hydroxide solution was added to the resulting solution to obtain an aqueous solution of the polymer (P-2) having a pH of 6.2. The solid content of this aqueous solution was 19.7% by mass. The weight average molecular weight of P-2 was 22,800.

Embodiment 3

[0091] (polymer synthesis)

[0092] In a reaction vessel equipped with a nitrogen conduit, a condenser, and a stirring device, 13 g of water was placed and heated to 60° C. under nitrogen flow. Over a period of 1 hour, water was added dropwise by mixing 4.38 g of IT-3 obtained in Synthesis Example 3, 3.10 g of a 20% aqueous acrylic acid solution, 0.1 g of mercaptopropionic acid, and 5.00 g of a 0.1N aqueous sodium hydroxide solution. Solution A was formed, and at the same time, 2.06 g of 5% 2,2-azobis[2-(5-methyl-2-imidazolin-2-yl)]propane was added dropwise over a period of 1 hour and 30 minutes Dihydrogen chloride (dihydro-chloride). After the dropwise addition was completed, the resulting mixed solution was further heated for 1 hour, followed by mixing with 0.7 g of a 30-weight aqueous sodium hydroxide solution and 15 g of water to obtain a polymer (P-3) having a pH value of 6.3. aqueous solution. The solid content of this aqueous solution was 11.0% by weight. The weigh...

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Abstract

A novel copolymer and a dispersant using the copolymer are provided. The copolymer is formed of a polyalkylene glycol diester body of itaconic acid, citraconic acid, or mesaconic acid and (meth)acrylic acid. It may further contain other copolymerizable monomer. The copolymer of this invention excels in dispersing property and water-reducing property and manifests a high flow magnitude. Thus, the cement composition using this copolymer enjoys excellent workability when it is put to use.

Description

technical field [0001] The present invention relates to a copolymer of a polyalkylene glycol diester of itaconic acid, citraconic acid or mesaconic acid and a specific (meth)acrylic acid, and a dispersant containing the copolymer. Background technique [0002] Cement is used extensively in civil engineering and building construction. Cement slurry formed by adding water to cement, mortar formed by adding sand as a fine aggregate thereto, and concrete formed by further mixing pebbles with it are used for structural members, ground beams, and firewalls and are widely used . Grout, mortar, and concrete are produced by the hydration between cement and water, which produces strength through coagulation and curing. As a result, their workability deteriorates with the lapse of time after adding water. This phenomenon in raw concrete is commonly referred to as slump loss. The slump loss increases with a corresponding decrease in the unitamount present in the slurry. Since incre...

Claims

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Application Information

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IPC IPC(8): C08F222/20C08F220/02C04B24/26C08F290/06C09K23/52
CPCC08F220/06C08F222/20C04B24/2647C08F290/062C04B2103/408
Inventor 林谷俊男
Owner NIPPON SHOKUBAI CO LTD
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