Cement mixing agent

A mixture and cement technology, applied in the field of cement mixture, can solve problems such as insufficient water reduction

Inactive Publication Date: 2007-04-18
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, water-reducing properties alone are not sufficient when used in cement compositions, etc.

Method used

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Examples

Experimental program
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Effect test

manufacture example

[0228] Add 614 g of commercially available polyethyleneimine (polyechinimine) (number-average molecular weight is 600; ethyleneimine addition number is 14) and 4 g of sodium hydride in a pressure vessel equipped with a stirrer, a pressure gauge, and a thermometer, and stir While sufficiently replacing with nitrogen, the temperature was raised to 150°C. Next, while slowly adding 1886 g (the average addition number of active hydrogen to polyethyleneimine is 3 moles) of ethylene oxide was reacted, and after adding all of it, it was aged at the same temperature for 30 minutes to obtain 2500 g of polyethyleneimine. Alkyl imine oxide alkylene compounds. This compound is designated as intermediate (a).

[0229] Production example of intermediate (b)

[0230] 474 g of the intermediate (a) was added to a pressure vessel equipped with a stirrer, a pressure gauge, and a thermometer, and the mixture was fully replaced with nitrogen while stirring, and then the temperature was raised to ...

manufacture example 2

[0233] In the pressure vessel that is equipped with stirrer, pressure gauge, thermometer, add 2334g of manufacturing example 1 to obtain , was fully replaced with nitrogen while stirring, and then the temperature was raised to 130°C. Next, while slowly adding 166 g (the average addition number of active hydrogen to polyethyleneimine is 6 moles) of propylene oxide was reacted, and after adding all of it, it was aged at the same temperature for 5 hours to obtain 2500 g of polyethyleneimine. Alkyl imine oxide alkylene compounds. Set the compound to .

manufacture example 3～7、30～36

[0235] Except for the average added moles of ethyleneimine and alkylene oxide, etc., as described in Table 1, the polyalkyleneimine oxide alkylene as shown in Table 1 was obtained in the same manner as in Production Example 1 or Production Example 2. adducts. In the table, EIn represents the average addition number of ethyleneimine, en1 and en2 represent the average addition number of ethylene oxide to the active hydrogen of polyethyleneimine, and pn represents the average addition number of propylene oxide to the active hydrogen of polyethyleneimine. Average additions. In addition, the molecular weight of polyethyleneimine used the molecular weight equivalent to EIn described in Table 1, respectively. The mass % of PO in the table shows the mass % of propylene oxide in 100 mass % of alkylene oxide.

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Abstract

To provide a cement admixture which makes it possible to: enhance slump maintaining capability; maintain fluidity; and provide a cement composition and the like having an appropriate viscosity for handling at the place where the composition and the like is handled. A cement admixture comprising an alkylene oxide adduct comprising a compound having 3 or more active hydrogens and an oxyalkylene group added to the compound, wherein an average molar number of addition of the oxyalkylene group relative to 1 mole of the active hydrogen is 100 mole or more.

Description

technical field [0001] The present invention relates to cement admixtures. More specifically, the present invention relates to a cement admixture that can be favorably used in cement compositions such as grout, mortar, and concrete. Background technique [0002] Cement admixtures are widely used as water reducing agents for cement compositions such as grout, mortar, and concrete. Cement admixtures are indispensable substances for constructing civil engineering and buildings from cement compositions. Such a cement admixture has the function of improving the strength and durability of the cured product by improving the fluidity of the cement composition and reducing the water content of the cement composition. Among such water reducers, those containing polycarboxylic acid-based polymers exhibit high water-reducing performance compared with conventional naphthalene-based water reducers, and thus have the potential as high-performance AE water reducers. Great practical result...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24
CPCC04B24/165C04B2103/308C04B2103/0079C04B24/2658C04B24/2647C04B2103/32C04B24/00C04B24/04
Inventor 宫川实上田富康
Owner NIPPON SHOKUBAI CO LTD
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