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Cement dispersing agent and concrete composition comprising same

A technology of concrete composition and cement dispersant, which is applied in the direction of amide/imide polymer adhesives, adhesive types, etc., and can solve the problems of not being able to achieve creep performance

Active Publication Date: 2006-05-24
SIKA LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they have not been able to utilize the alkaline conditions in cement dispersions to achieve slow release performance

Method used

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  • Cement dispersing agent and concrete composition comprising same
  • Cement dispersing agent and concrete composition comprising same
  • Cement dispersing agent and concrete composition comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066]

[0067] 103 g (1.00 mol) of diethylenetriamine and 97.3 g (0.67 mol) of adipic acid were placed in a reaction vessel provided with a stirrer, and the mixture was stirred and mixed in a nitrogen atmosphere by passing nitrogen gas. The temperature was raised to 150° C., the water produced by the reaction was removed while the polycondensation was performed, and the reaction was carried out for 20 hours until the acid value became 22. Then, 1.1 g of hydroquinone methyl ether and 27.5 g (0.32 mol) of methacrylic acid were added, and the mixture was reacted at the same temperature (150° C.) for 10 hours. Thus, a total of 42 g of reaction distilled water and 187 g of polyamide polyamine (melting point 122° C., acid value 23) were obtained. The whole amount of this polyamide polyamine was dissolved in 272 g of water, and the temperature was raised to 50°C. Further, 220 g of ethylene oxide (corresponding to 3.0 mol with respect to the total amount of amino residues includin...

Embodiment 2～9

[0082] In the same manner as in Example 1, A-2 to A-6, which are polyamide polyamine alkylene oxide adducts, were obtained from the raw materials shown in Table 1. In addition, using Compound A, Compound B, Compound C, and Compound D shown in Table 2, copolymerization was carried out in the same preparation method as in Example 1 to obtain water-soluble amphoteric copolymers (Examples 2 to 9) (however, it was necessary to adjust Moisture makes the solid content of the obtained copolymer 40%).

[0083] [Table 1]

[0084] Compound A

A-1

A-2

A-3

A-4

A-5

A-6

(a)DETA*2

TETA*3

(b) Adipic acid

Dimethyl adipate

Acid value of intermediate condensate*4

(c) Acrylic

Methacrylate

methyl methacrylate

Acid value of final condensate*5

(d) Ethylene oxide

Propylene oxide

1.00

-

0.67

-

22

-

0.32

-

23

3.0

-

1.00

-

0.83

-

19

...

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Abstract

A cement dispersant which comprises a water-soluble amphoteric copolymer produced from ingredients including an unsaturated polyamide-polyamine / alkylene oxide adduct and two or more polyalkylene glycol esters. After the dispersant is kneaded together with a concrete composition, the dispersing ability thereof increases with time. It is highly effective in reducing concrete viscosity. [MEANS FOR SOLVING PROBLEMS] The cement dispersant composition comprises as an essential ingredient either a water-soluble amphoteric copolymer obtained through copolymerization from (A) an unsaturated polyamide-polyamine / alkylene oxide adduct, (B) (meth) acrylic acid or an alkali metal salt or ammonium or alkanolamine salt thereof, (C) a polyalkylene glycol ester of methacrylic acid, and (C) a polyalkylene glycol ester of acrylic acid or a neutral salt of the copolymer.

Description

technical field [0001] The present invention relates to a cement dispersant and a concrete composition containing the dispersant. More specifically, the present invention relates to a water-soluble amphoteric copolymer containing an unsaturated group-containing polyamide polyamine alkylene oxide adduct and two or more types of polyalkylene glycol esters, and having the ability to combine cement such as concrete. Dispersibility increases with time when kneaded, a cement dispersant having excellent slump retention when used alone or in admixture with conventional mortar and concrete additives, and a concrete composition containing the dispersant. Background technique [0002] As conventional cement dispersants, polymelamine sulfonates, lignosulfonates, copolymers of olefins and maleic acid, polycarboxylic acid-based dispersants, and the like are used. However, at present, there are problems in operations such as waiting for a long time for a raw material truck at the work sit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B28/02C08L33/14
CPCC04B24/2658C04B24/2694C04B28/02C04B40/0039C04B2103/408C08G73/028C08L33/24C08L79/02C09J133/24C04B2103/304C04B2103/50
Inventor 板东公文W·M·丹兹格尔今村顺齐藤贤友寄哲小林笃池田亮越坂诚一
Owner SIKA LTD
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