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Sodium lignin sulfonate water reducing agent and preparation method thereof

A technology of sodium lignosulfonate and water reducing agent, which is applied in the field of water reducing agent, can solve the problems of low sulfonation rate and water reducing rate, poor effect of improving the compressive strength of dispersed concrete, etc. Water rate, improvement effect, improvement effect of water reduction rate

Inactive Publication Date: 2020-05-12
茂名市红福化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this invention is that its sulfonation rate and water reducing rate are not high, and its dispersibility and effect on improving the compressive strength of concrete are not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Follow the steps below to prepare sodium lignosulfonate water reducer:

[0032] S1. Dry the chestnut shell at 80°C for 24 hours, pulverize it, ball mill it, and pass through a 100-mesh sieve to obtain chestnut shell powder. Add the chestnut shell powder to a mixed solution of toluene and petroleum ether (the volume ratio of toluene and petroleum ether is 1:1) ), the ratio of chestnut husk powder and toluene petroleum ether solution is 1g:40mL, placed in a Soxhlet extractor at 90°C for extraction for 3 hours to obtain defatted chestnut husk powder;

[0033] S2. Add the defatted chestnut husk powder obtained in step S1 into 1-hexyl-3-methyl-imidazolium bisulfate and stir to obtain a mixed solution. The defatted chestnut husk powder and 1-hexyl-3-methyl-imidazolium The weight ratio of bisulfate is 1:25, and the mixed solution is added to a micro-fluidic extractor to extract the extract. The extraction temperature of the micro-fluidic extractor is 70°C, and the pressure is ...

Embodiment 2

[0037] Follow the steps below to prepare sodium lignosulfonate water reducer:

[0038] S1. Dry the chestnut shell at 80°C for 24 hours, pulverize it, ball mill it, and pass through a 100-mesh sieve to obtain chestnut shell powder. Add the chestnut shell powder to a mixed solution of toluene and petroleum ether (the volume ratio of toluene and petroleum ether is 1:1) ), the ratio of chestnut husk powder and toluene petroleum ether solution is 1g:40mL, placed in a Soxhlet extractor at 90°C for extraction for 3 hours to obtain defatted chestnut husk powder;

[0039] S2. Add the defatted chestnut husk powder obtained in step S1 into 1-hexyl-3-methyl-imidazolium bisulfate and stir to obtain a mixed solution. The defatted chestnut husk powder and 1-hexyl-3-methyl-imidazolium The weight ratio of bisulfate is 1:30, and the mixed solution is added into a micro-fluidic extractor to extract the extract. The extraction temperature of the micro-fluidic extractor is 70°C and the pressure is 1...

Embodiment 3

[0043] Follow the steps below to prepare sodium lignosulfonate water reducer:

[0044] S1. Dry the chestnut shell at 80°C for 24 hours, pulverize it, ball mill it, and pass through a 100-mesh sieve to obtain chestnut shell powder. Add the chestnut shell powder to a mixed solution of toluene and petroleum ether (the volume ratio of toluene and petroleum ether is 1:1) ), the ratio of chestnut husk powder and toluene petroleum ether solution is 1g:40mL, placed in a Soxhlet extractor at 90°C for extraction for 3 hours to obtain defatted chestnut husk powder;

[0045] S2. Add the defatted chestnut husk powder obtained in step S1 into 1-hexyl-3-methyl-imidazolium bisulfate and stir to obtain a mixed solution. The defatted chestnut husk powder and 1-hexyl-3-methyl-imidazolium The weight ratio of bisulfate is 1:27, and the mixed solution is added to a micro-fluidic extractor to extract the extract. The extraction temperature of the micro-fluidic extractor is 70°C, and the pressure is ...

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Abstract

The invention provides a sodium lignin sulfonate water reducing agent which is prepared by the following steps: S1, drying chestnut shells, crushing, ball-milling and sieving to obtain chestnut shellpowder, and extracting to obtain degreased chestnut shell powder; S2, adding the degreased chestnut shell powder into 1-hexyl-3-methyl-imidazolium bisulfate to obtain a mixed solution, adding the mixed solution into a micro-jet extractor, and extracting to obtain lignin; S3, carrying out a reaction among lignin, sodium sulfite, formaldehyde and distilled water to obtain sodium lignin sulfonate; and S4, grafting sodium lignin sulfonate and tartaric acid to obtain the sodium lignin sulfonate water reducing agent. The invention also provides a preparation method of the sodium lignin sulfonate water reducing agent. The sodium lignin sulfonate water reducing agent provided by the invention has the advantages of higher sulfonation rate, higher water reducing rate, better dispersity and higher effect of improving the compressive strength of concrete.

Description

technical field [0001] The invention relates to a water reducer, in particular to a sodium lignosulfonate water reducer and a preparation method thereof. Background technique [0002] Water reducing agent refers to the admixture that can reduce the amount of mixing water and increase the strength of concrete under the condition of constant workability and cement dosage of concrete; or save the amount of cement under the condition of constant workability and strength. Its appearance Divided into water and powder. Water reducers can be divided into: lignin sulfonates; polycyclic aromatic salts; water-soluble resin sulfonates and so on. Among them, the main raw material of lignosulfonate water reducer is lignosulfonate. Lignin is a natural aromatic polymer with a content second only to cellulose and chitin in nature, and lignosulfonate (water reducer) is the most widely used lignin product. Lignosulfonate water reducers mainly include calcium lignosulfonate, sodium lignosulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C04B24/18C04B103/30
CPCC04B24/18C04B2103/302C08H6/00
Inventor 黄琼安张宇平卢燕祥宋靖怡张铜锋柯泽华邱华凤
Owner 茂名市红福化学有限公司
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