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Water reducer

A technology of water reducing agent and aqueous solution, applied in the field of construction engineering, can solve the problems of human harm, unfavorable promotion and application, high price, and achieve the effect of saving cement

Inactive Publication Date: 2012-04-18
王琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-reducing performance of melamine sulfonate formaldehyde condensate high-efficiency water reducer is better than that of tea sulfonate formaldehyde condensate high-efficiency water-reducer, but for a long time because of the high price of melamine, melamine sulfonate formaldehyde condensate high-efficiency water reducer The price of tea sulfonate formaldehyde condensate high-efficiency water reducer is higher than that of high-efficiency water reducer. It has not been widely used in large quantities in my country, and the output is extremely small. Moreover, it contains toxic and harmful compounds such as cyanide and naphthalene, which can be harmful to the human body at any time. , animals and plants, etc., so it is not ideal to widely promote and apply it in the field of construction
Although the production cost of the invention is low, melamine is a harmful substance, especially harmful to the human body, which is not conducive to widespread application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A water reducer, comprising the following components in parts by weight:

[0020] 35 parts of ethylene oxide compound, 10 parts of urea, 22 parts of calcium lignosulfonate, 55 parts of 30% sodium hydroxide aqueous solution, 35 parts of formaldehyde;

[0021] The preparation method of the water reducing agent is completed according to the following steps:

[0022] A, the oxirane compound, urea, calcium lignosulfonate of above-mentioned weight portion are put into mixing container and stirred for 10 minutes, then add sodium hydroxide aqueous solution, continue to stir for 10 minutes, set aside;

[0023] B. Heat the material obtained in step A to 55°C, add formaldehyde, continue heating to 75°C, stop heating, keep warm for 1 hour, and set aside;

[0024] C. Add aqueous sodium hydroxide solution to the material obtained in step B again, stir for 3 minutes, and obtain a water reducer after the temperature of the material is lowered to normal temperature....

Embodiment 2

[0026] A water reducer, comprising the following components in parts by weight:

[0027] 40 parts of ethylene oxide compound, 12 parts of urea, 30 parts of calcium lignosulfonate, 60 parts of 30% sodium hydroxide aqueous solution, 40 parts of formaldehyde;

[0028] The preparation method of the water reducing agent is completed according to the following steps:

[0029] A, the oxirane compound, urea, calcium lignosulfonate of above-mentioned parts by weight are put into mixing vessel and stirred for 12 minutes, then add sodium hydroxide aqueous solution, continue to stir for 15 minutes, set aside;

[0030] B. Heat the material obtained in step A to 60°C, add formaldehyde, continue heating to 75°C, stop heating, keep warm for 1.5 hours, and set aside;

[0031] C. Add aqueous sodium hydroxide solution to the material obtained in step B again, stir for 4 minutes, and obtain a water reducer after the temperature of the material is lowered to normal temperature...

Embodiment 3

[0033] A water reducer, comprising the following components in parts by weight:

[0034] 50 parts of ethylene oxide compound, 15 parts of urea, 38 parts of calcium lignosulfonate, 65 parts of 30% sodium hydroxide aqueous solution, 45 parts of formaldehyde;

[0035] The preparation method of the water reducing agent is completed according to the following steps:

[0036] A, the oxirane compound, urea, calcium lignosulfonate of above-mentioned weight portion are put into mixing container and stirred for 15 minutes, then add sodium hydroxide aqueous solution, continue to stir for 15 minutes, set aside;

[0037] B. Heat the material obtained in step A to 65°C, add formaldehyde, continue heating to 75°C, stop heating, keep warm for 2 hours, and set aside;

[0038] C. Add sodium hydroxide aqueous solution to the material obtained in step B again, stir for 5 minutes, and obtain a water reducer after the temperature of the material is lowered to normal temperature...

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PUM

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Abstract

The invention discloses a water reducer comprising the following components in parts by weight: 35-50 parts of epoxyethane compound, 10-15 parts of urea, 20-40 parts of calcium lignosulphonate, 55-75 parts of sodium hydroxide water solution with the concentration of 30% and 35-55 parts of formaldehyde. The water reducer is prepared by stirring and heating the components. The water reducer disclosed by the invention has a better water reducing property than that of a high-efficiency naphthalene sulfonate formaldehyde condensate water reducer and simultaneously substitutes for the expensive melamine monomer, so that a new water reducer with excellent properties and low price without containing cyanogen, naphthalene and other harmful substances to human bodies, animals and plants is synthesized.

Description

technical field [0001] The invention relates to a water-reducing agent, in particular to a water-reducing agent for cement, concrete and mortar, which belongs to construction engineering. Background technique [0002] Cement concrete is the most used building material in the world, but it has some weaknesses such as self-heaviness, low strength and brittleness. With the rapid development of the construction industry, new requirements are continuously put forward for the performance of concrete in various aspects, such as improving the strength of concrete and improving the slump loss of concrete during transportation. Ordinary concrete has been difficult to meet the new construction technology requirements. Adding admixtures to concrete is an effective, convenient and economical method to increase concrete strength and improve various properties of concrete. Water reducer is the most widely used admixture in concrete. The main superplasticizers currently used include mod...

Claims

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Application Information

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IPC IPC(8): C04B24/18C04B103/30
Inventor 王琴
Owner 王琴
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