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Method for preparing composite polycarboxylate superplasticizer from straws

A technology for compounding polycarboxylic acid and water reducing agent, which is applied in the field of preparing compound polycarboxylic acid water reducing agent by using straw, can solve the problems of increased alkali content of admixtures, adverse effects on concrete mechanical properties, shortened service life of buildings, and the like. The effect of improving water reduction rate and concrete strength, improving concrete workability, and increasing concrete slump

Inactive Publication Date: 2020-05-08
王万连
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lignosulfonate water-reducing agent is cheap, but the water-reducing rate is low, and it is easy to cause retardation in the mixture with low water-cement ratio, and its large air-entraining characteristic will also cause adverse effects on the mechanical properties of concrete, so Gradually replaced by naphthalene-based superplasticizers
Naphthalene-based high-efficiency water reducer, its high content of sodium sulfate will increase the alkali content of the admixture, reduce the durability of concrete, and cause alkali-aggregate reaction, which will greatly shorten the service life of the building

Method used

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  • Method for preparing composite polycarboxylate superplasticizer from straws

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of method utilizing straw to prepare composite polycarboxylate water reducing agent, comprises the following steps:

[0020] Step 1: collect the straw, dry it and crush it, mix the dry powder with dilute hydrochloric acid solution, heat it to 100°C for 3 hours, let it cool, filter to remove the acid solution, and rinse with water to get the wet powder;

[0021] Step 2, mix the wet powder in step 1 with isopropanol solution of sodium hydroxide, keep warm at 20°C for 2 hours, add sodium sulfite and 1,3-propyl sultone, react with ultrasound for 1 hour, filter and rinse with absolute ethanol , to obtain modified cellulose;

[0022] Step 3, mix isobutylene alcohol polyoxyethylene ether and sodium methacrylate sulfonate, heat to 70°C, add ammonium persulfate and acrylic acid dropwise, keep warm for 3 hours, adjust the pH to 6 after cooling, and add the modified fiber in step 2 element, stirred to obtain a mixed solution;

[0023] Step 4, add formaldehyde to the mixed...

Embodiment 2

[0031] A kind of method utilizing straw to prepare composite polycarboxylate water reducing agent, comprises the following steps:

[0032] Step 1: collect the straw, dry it and crush it, mix the dry powder with dilute hydrochloric acid solution, heat it to 105°C for 3 hours, let it cool, filter to remove the acid solution, rinse with water to get the wet powder;

[0033] Step 2, mix the wet powder of step 1 with the isopropanol solution of sodium hydroxide, keep warm at 25°C for 1h, add sodium sulfite and 1,3-propyl sultone, react with ultrasound for 1h, filter and rinse with absolute ethanol , to obtain modified cellulose;

[0034] Step 3, mix isobutylene alcohol polyoxyethylene ether and sodium methacrylate sulfonate, heat to 80°C, add ammonium persulfate and acrylic acid dropwise, keep warm for 3 hours, adjust the pH to 7 after cooling, and add the modified fiber in step 2 element, stirred to obtain a mixed solution;

[0035] Step 4, add formaldehyde to the mixed solution...

Embodiment 3

[0043] A kind of method utilizing straw to prepare composite polycarboxylate water reducing agent, comprises the following steps:

[0044] Step 1: collect the straw, dry it and crush it, mix the dry powder with dilute hydrochloric acid solution, heat it to 110°C for 2 hours, let it cool, filter to remove the acid solution, rinse with water to get the wet powder;

[0045] Step 2, mix the wet powder of step 1 with the isopropanol solution of sodium hydroxide, keep warm at 30°C for 1 hour, add sodium sulfite and 1,3-propyl sultone, react with ultrasound for 1 hour, filter and rinse with absolute ethanol , to obtain modified cellulose;

[0046] Step 3, mix isobutylene alcohol polyoxyethylene ether and sodium methacrylate sulfonate, heat to 90°C, add ammonium persulfate and acrylic acid dropwise, keep the temperature for 2 hours, adjust the pH to 8 after cooling, and add the modified fiber in step 2 element, stirred to obtain a mixed solution;

[0047] Step 4, add formaldehyde to...

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Abstract

The invention provides a method for preparing a composite polycarboxylate superplasticizer from straws. The method comprises the following steps: drying the straws in the sun, crushing, carrying out acidolysis by using a dilute hydrochloric acid solution, and reacting the treated wet powder with sodium sulfite and 1,3-propylsultone in an isopropanol solution of sodium hydroxide to obtain modifiedcellulose; and mixing the modified cellulose with a polycarboxylate superplasticizer, and reacting to obtain the modified polycarboxylate superplasticizer. The straws are modified and then added intothe polycarboxylate superplasticizer, so that the water reducing rate of the superplasticizer and the strength of concrete can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of water reducer preparation, and in particular relates to a method for preparing composite polycarboxylate water reducer by utilizing straw. Background technique [0002] Water reducing agent is a concrete admixture that can reduce the amount of mixing water under the condition that the slump of the concrete mixture is basically the same. As the most widely researched and used concrete admixture at present, water reducing agent can greatly improve the fluidity and slump of concrete, and at the same time, it can effectively reduce the mixing water consumption and significantly improve the working performance of concrete. Therefore, water reducing agents are widely used in the preparation of concrete required in the construction of houses, roads and bridges, airports, and dams. The concrete water reducers commonly used in my country are mainly lignosulfonate water reducers, naphthalene-based high-efficiency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02C04B103/30
CPCC04B24/163C04B24/168C04B40/0039C04B2103/302C08F283/065C08F220/06C08F228/02
Inventor 王万连
Owner 王万连
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