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Lignosulfonate series air entraining and water reducing admixture for concrete and its prepn process and application

A technology of lignosulfonate and air-entraining water-reducing agent, which is applied in the field of lignosulfonate-based concrete air-entraining water-reducing agent and its preparation, can solve the problems of low content of lignosulfonate and the like, and achieves improved resistance to The effect of permeability, reducing bleeding rate, and high water reduction rate

Inactive Publication Date: 2007-06-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these patented products, lignosulfonate is only used as an air-entraining water reducer compounded with other admixtures, and the content of lignosulfonate is relatively small, which does not involve chemical modification of lignosulfonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Get 100 grams of calcium lignosulfonate solid, add 100 grams of water, add 5 grams of NaOH to adjust the pH of the solution to 9, heat to a certain operating temperature while stirring, and the operating temperature is controlled at 60 ° C; add 1 gram of sulfurous acid React iron and 3 grams of hydrogen peroxide in the reactor for 30 minutes, raise the temperature to 80°C, then add 5 grams of formaldehyde and 5 grams of dodecylamine, carry out amination reaction for 30 minutes, and then dropwise add 5 grams of formaldehyde to carry out condensation reaction 1 hour, add 1 gram of fatty alcohol sodium sulfate and 1 gram of carboxymethyl cellulose to the above reaction product, and carry out rapid stirring for 20 minutes, after cooling, the liquid product of the air-entraining water reducer of the present invention can be obtained, and spray-dried However, the powdered product of the present invention can be obtained.

Embodiment 2

[0044] Get 100 grams of magnesium lignosulfonate solid, add 100 grams of water, add 10 grams of KOH to adjust the pH of the solution to 11, heat to a certain operating temperature while stirring, and the operating temperature is controlled at 80 ° C; add 3 grams of ferric sulfite React with 2 grams of sodium nitrite and 20 grams of potassium permanganate in the reactor for 60 minutes, raise the temperature to 95°C, then add 10 grams of formaldehyde and 20 grams of ethylenediamine, carry out the amination reaction for 60 minutes, and then dropwise add 20 grams of The condensation reaction of formaldehyde was carried out for 3 hours, and 2 grams of sodium lauryl alcohol polyoxyethylene ether sulfate and 3 grams of fatty alcohol polyoxyethylene ether, 3 grams of hydroxypropyl methylcellulose and 2 grams of sodium lauryl polyoxyethylene ether were added to the above reaction product Carboxymethyl cellulose, and rapid stirring for 30 minutes, after cooling, the liquid product of the...

Embodiment 3

[0046] Take 100 grams of lignosulfonate solid, add 100 grams of water, add 5 grams of NaOH and 2.5 grams of NH 4 OH to adjust the pH to 10, and heat to a certain operating temperature while stirring, and the operating temperature is controlled at 70°C; add 2.5 grams of ferric sulfite, 1 gram of copper nitrate, and 10 grams of potassium persulfate to react in the reactor for 40 minutes, and heat up to 90°C. ℃, then add 8 grams of formaldehyde and 15 grams of ethylenediamine, carry out amination reaction for 40 minutes, then dropwise add 15 grams of formaldehyde to carry out condensation reaction for 2 hours, add 2 grams of dodecyl alcohol polyoxyethylene to the above reaction product Sodium ether sulfate and 1 gram of fatty alcohol polyoxyethylene ether, 1 gram of hydroxypropyl methylcellulose and 1 gram of polyvinyl alcohol are stirred rapidly for 30 minutes, and the high-performance air-entraining and water-reducing method of the present invention can be obtained after cooling...

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Abstract

The present invention relates to preparation process of serial lignosulfonate air entraining and water reducing admixtures for concrete. The preparation process includes the following steps: dissolving solid lignosulfonate in water of the same weight, adding catalyst and oxidant, heating after reaction, adding amine and partial aldehyde to aminate, and dropping the rest aldehyde for condensation reaction to obtain the product; adding surfactant and polymer through stirring, and cooling to obtain liquid phase lignosulfonate as air entraining and water reducing admixture. The present invention is used as the admixture for concrete, and has relatively high water reducing rate, capacity of raising the strength of concrete, and certain setting retarding effect to delay the appearance of cement setting heat peak and reduce crack caused by temperature change.

Description

technical field [0001] The invention relates to a concrete water reducer and a preparation method thereof. More specifically, the present invention relates to a lignosulfonate-based concrete air-entraining water reducer prepared from a by-product of pulping and papermaking, lignosulfonate, and its preparation method and application. Background technique [0002] With the development of construction technology, the durability requirements of concrete structures are getting higher and higher. The premature failure of many concrete structures is not due to the strength but the lack of durability. The huge annual maintenance costs are 1 to 3 times the construction costs. Permeability has the greatest impact on the durability of concrete and is considered to be one of the most important comprehensive indicators to measure the durability of concrete. Modern concrete is composed of cement, water, sand, stone, admixtures and admixtures. Cement and its amount have a major impact on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18C04B103/30
Inventor 杨东杰邱学青庞煜霞楼宏铭欧阳新平
Owner SOUTH CHINA UNIV OF TECH
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