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A kind of modified water reducing agent and preparation method thereof

A water-reducing agent and modification technology, applied in the field of modified water-reducing agent and its preparation, can solve the problems of reduced concrete strength, unsuitable for winter construction, concrete not hardening, etc. Good adaptability of cement

Active Publication Date: 2021-03-23
贵州凯襄新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, lignosulfonate has gas condensation and air-entraining effects, which will reduce the strength of concrete, and even the phenomenon that the concrete will not harden for a long time, and lignosulfonate is sensitive to the environment and climate during use, so it is not suitable for winter construction

Method used

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  • A kind of modified water reducing agent and preparation method thereof
  • A kind of modified water reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] A modified water reducer, raw materials include: amino acid 2kg, polycarboxylate water reducer 12kg, melamine 4kg, gluconate 8kg, sulfonated black liquor 7kg;

[0031] Described sulfonated black liquor, its preparation method comprises the steps:

[0032] (1) Take papermaking black liquor and diatomaceous earth and mix evenly at a mass ratio of 1:0.03, stir for 50 minutes at a temperature of 40°C, then cool to room temperature, filter to get the filter residue;

[0033] (2) Add 95% citric acid solution of 0.2 times the quality of the filter residue and 80% sulfuric acid solution of 0.01 times the quality of the filter residue to the filter residue, stir for 30 min at a temperature of 95° C., then cool to 78° C., add 30% citric acid solution of 0.2 times the quality of the filter residue % sulfonating agent stirred for 30min, lowered to normal temperature to obtain sulfonated black liquor;

[0034] The sulfonating agent is sodium methylsulfonate;

[0035] The preparati...

Embodiment 2

[0040] A modified water reducer, raw materials include: amino acid 10kg, polycarboxylate water reducer 18kg, melamine 9kg, gluconate 15kg, sulfonated black liquor 20kg;

[0041] Described sulfonated black liquor, its preparation method comprises the steps:

[0042] (1) Take papermaking black liquor and diatomaceous earth and mix evenly at a mass ratio of 1:0.05, stir for 60 minutes at a temperature of 50°C, then cool to room temperature, filter to get the filter residue;

[0043] (2) Add 98% citric acid solution of 0.4 times the quality of the filter residue and 80-85% sulfuric acid solution of 0.03 times the quality of the filter residue to the filter residue, stir at a temperature of 98°C for 35min, then cool down to 85°C, and add 0.4 times the weight of the filter residue 50% of the sulfonating agent was stirred for 35 minutes and cooled to normal temperature to obtain sulfonated black liquor;

[0044] The sulfonating agent is a mixture of sodium isethionate and sodium hyd...

Embodiment 3

[0050] A modified water reducer, raw materials include: amino acid 6kg, polycarboxylate water reducer 15kg, melamine 6kg, gluconate 11kg, sulfonated black liquor 14kg;

[0051] Described sulfonated black liquor, its preparation method comprises the steps:

[0052] (1) Take papermaking black liquor and diatomaceous earth and mix evenly at a mass ratio of 1:0.04, stir for 55 minutes at a temperature of 45°C, then cool to room temperature, and filter to obtain the filter residue;

[0053] (2) Add 96% citric acid solution with 0.3 times the quality of filter residue and 82% sulfuric acid solution with 0.02 times the quality of filter residue to the filter residue, stir for 32min at a temperature of 97°C, then cool to 82°C, add 30% citric acid solution with 0.3 times the quality of filter residue Stir with -50% sulfonating agent for 32 minutes and cool down to normal temperature to obtain sulfonated black liquor;

[0054]The sulfonating agent is a mixture of sodium hydroxymethanes...

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Abstract

The invention relates to the technical field of water reducing agents, in particular to a modified water reducing agent and a preparation method thereof. The modified water reducing agent is preparedfrom the following raw materials in parts by weight: 2 to 10 parts of amino acid, 12 to 18 parts of a polycarboxylate water reducer, 4 to 9 parts of melamine, 8 to 15 parts of gluconate, and 7 to 20 parts of sulfonated black solution. The Aamino acid, the polycarboxylate water reducer, themelamine,the gluconate and the sulfonated black solution are used as raw materials to form an initiatingon system integrating the oxidation and reduction, and the initiation activity is improved, so that the reaction can be performed in the range of 0 to 45 DEG C, and the problem of low initiation efficiencyunder the low temperature condition can be avoided; and the water reducing agent prepared in the invention has small mixing amount, high water reducing rate and good cement adaptability, can improve the strength of the concrete, and has excellent slump retention capability.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a modified water reducer and a preparation method thereof. Background technique [0002] If the waste liquid produced in the pulping process of the papermaking industry is discharged directly without treatment, it will cause serious pollution to the environment. The black liquor of papermaking is rich in alkali lignin. Studies have shown that through the classification of alkali lignin, crosslinking reaction, Condensation reaction and other methods change the spatial structure of sulfonated lignin, increase the relative molecular weight, and induce functional groups, which can have excellent comprehensive properties such as high-efficiency retardation and low slump loss. [0003] Patent No. CN201510576062.1 discloses a method for preparing high-efficiency concrete water reducer by using paper-making black liquor, which belongs to the field of waste utilization. This invent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/30
CPCC04B40/0039C04B2103/302C04B24/12C04B24/128C04B24/10C04B24/001
Inventor 张鑫
Owner 贵州凯襄新材料有限公司
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