Alkali lignose concrete air-leading water-reducing agent, preparation and use thereof

A technology of air-entraining water-reducing agent and alkali lignin, which is applied in the fields of building materials and lignin chemistry, and can solve the problem of difficult to achieve high-performance air-entraining water-reducing agent, unsatisfactory air-entraining and water-reducing effects, and water-soluble alkali lignin. problems such as poor performance, achieve significant economic and environmental benefits, reduce segregation and bleeding, and improve the value of use

Inactive Publication Date: 2008-12-24
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alkali lignin has poor water solubility and is only soluble in alkaline solutions, so it is difficult to use directly. Sulfonation is an important way to improve the water solubility of alkali lignin and endow it with excellent performance. Currently, high-temperature sulfonation, oxidative sulfonation and other processes are mainly used. Modification, but due to the complex structure of alkali lignin and low reactivity, the current sulfonated alkali lignin products have low molecular weight, and the air-entraining and water-reducing effects are not ideal. Generally, they can only be used as ordinary water-reducing agents. It is difficult to reach the level of high-performance air-entraining superplasticizer

Method used

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  • Alkali lignose concrete air-leading water-reducing agent, preparation and use thereof
  • Alkali lignose concrete air-leading water-reducing agent, preparation and use thereof
  • Alkali lignose concrete air-leading water-reducing agent, preparation and use thereof

Examples

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Effect test

Embodiment 1

[0041]Dissolve 100 grams of wheatgrass lignin solid in 100 grams of water to prepare an aqueous solution with a concentration of 50% by weight, and heat it to 60°C while stirring; add 5 grams of hexamethylenediamine, drop 5g of formaldehyde, and react for 1 hour to obtain Amination of alkali lignin; add 50g of bisulfite to 15g of formaldehyde, heat to 50°C while stirring, and react for 20 minutes to obtain alkyl sulfonate compounds; aminate the above obtained aminated alkali lignin and alkyl sulfonate The acid salt compounds were mixed, and the pH value was adjusted to 11 with a NaOH aqueous solution with a concentration of 50% by weight, and the temperature was raised to 85° C., and the polycondensation reaction was carried out for 3 hours, and 2 grams of sodium cetyl sulfate was added to the above reaction product, and stirred for 20 Minutes, after cooling, the liquid product of the air-entraining water reducer of the present invention is obtained, and the powder product of t...

Embodiment 2

[0043] The bamboo pulp alkali lignin solid of 100 grams is dissolved in the water of 122 grams and is mixed with the aqueous solution that weight percent concentration is 45%, is heated to 80 ℃ while stirring; Add 10 grams of trihydroxyethylamine, dropwise 20g acetaldehyde, React for 3 hours to obtain aminated alkali lignin; add 100g of sodium p-aminobenzenesulfonate to 30g of acetaldehyde, heat to 70°C while stirring, and react for 60 minutes to obtain alkylsulfonate compounds; Mix aminated alkali lignin and alkyl sulfonate compounds, adjust the pH value to 13 with NaOH aqueous solution with a concentration of 50% by weight, heat up to 100°C, and perform polycondensation reaction for 4 hours, and add 3 The mixture of 1 gram of coconut oil alkyl alcohol amide and 3 gram of nonylphenol polyoxyethylene ether was stirred for 20 minutes, and the liquid product of air-entraining water reducer of the present invention was obtained after cooling, and the powdery product of the present...

Embodiment 3

[0045] Get 100 grams of wood pulp alkali lignin solid and dissolve it in 100 grams of water to prepare an aqueous solution with a concentration of 50% by weight, and heat it to 70°C while stirring; add 15 grams of dimethylamine, and drop 10g of glyoxal to carry out Amination reaction for 2 hours to obtain aminated alkali lignin products; take 80g of potassium sulfite, add 20g of glyoxal, heat to 60°C while stirring, and react for 50 minutes to obtain alkylsulfonate compounds; Mix the aminated alkali lignin and alkyl sulfonate compounds, while stirring, add an appropriate amount of NaOH solution with a concentration of 50% by weight to adjust the pH value to 12, heat up to 90 ° C, and carry out polycondensation reaction for 3 hours. The above reaction Add the mixture of 1 gram of sodium cetyl sulfate, 1 gram of coconut oil alkanolamide and 1 gram of nonylphenol polyoxyethylene ether in the product, stir for 20 minutes, and obtain the liquid product of the air-entraining water re...

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Abstract

The invention discloses an alkali lignin concrete water reducing agent, a preparation method and application thereof. The preparation method comprises the following steps: dissolving the alkali lignin in water, adding amines and dropping aldehydes into the mixed solution, reacting the mixed solution to get aminating alkali lignin; adding sulfonating agent into the aldehydes and reacting to get alkane sulfonate compounds; then mixing the aminating alkali lignin and the alkane suflonate compounds to conduct polycondensation, getting alkali lignin concrete water reducing agent, wherein the alkali lignin is 100 parts, amines are 5-20 parts, aldehydes are 20-50 parts, sulfonating agent is 50-100 parts and the surfactant is 2-6 parts(by weight part). The water reducing agent is used for preparing concrete, and the dosage of the water reducing agent according to the weight percentage is 0.2-0.6% of the cement in the concrete. The concrete water reducing agent of the invention has advantages of abundant material source, no toxic, simple production technology and low cost with a water-reducing rate of 22.5%, which significantly increases the fluidity of the concrete and improves the intension of the concrete.

Description

technical field [0001] The invention relates to a concrete air-entraining water reducer and its preparation method and application, which belong to the technical field of building materials and lignin chemistry; Concrete air-entraining superplasticizer. Background technique [0002] Concrete is currently the most widely used building material. With the development of building technology, higher requirements are put forward for concrete materials from strength to durability. However, in many projects, people often only pay attention to strength and ignore durability in terms of structural design, material selection, and production of concrete, resulting in a large number of concrete structures that are far from reaching the due 80-100 years of economic durability. Decay" has increasingly become a common problem in concrete structures. The annual cost of repairing and rebuilding concrete structures in the world is as high as tens of billions or even hundreds of billions of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/30
CPCC04B28/18C04B2103/302C04B2103/304
Inventor 邱学青杨东杰庞煜霞楼宏铭欧阳新平
Owner SOUTH CHINA UNIV OF TECH
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