Preparation method of strengthening and toughening polycarboxylate water reducing agent

A polycarboxylate-based, strengthening and toughening technology, applied in the field of preparation of polycarboxylate-based water reducers, can solve the problems of large resource and energy consumption, environmental pollution, etc., and achieve improved compressive strength, good slump performance, High water reduction effect

Active Publication Date: 2012-07-25
河北圣通建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Concrete is still the most important building material in the world today. The production of concrete requires a large amount of cement,

Method used

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  • Preparation method of strengthening and toughening polycarboxylate water reducing agent

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: see figure 1 ,

[0018] 1) Add 6 parts of graphite powder with a particle size of <30 microns and 3 parts of sodium nitrate in parts by mass into 60 parts of concentrated sulfuric acid with a temperature of 5°C and a mass fraction of 98% under stirring, and slowly add 18 parts after stirring and mixing evenly. Parts of potassium permanganate, reacted at room temperature for 10 hours, slowly added 200 parts of deionized water, raised the temperature to 68°C and continued to react for 4 hours, then added dropwise 20 parts of hydrogen peroxide solution with a mass fraction of 30%, ultrasonically dispersed for 30 Minutes later, centrifuge, wash repeatedly to remove sulfuric acid, and dry at 60°C to obtain graphene oxide;

[0019] 2) Take 20 parts by mass of allyl polyoxyethylene ether, 0.5 parts of graphene oxide and 0.2 parts of concentrated sulfuric acid with a mass fraction of 98%, mix and stir to raise the temperature to 60 ° C, keep warm and ultrasonical...

Embodiment 2

[0024] 1) Add 6 parts of graphite powder with a particle size of <30 microns and 3 parts of sodium nitrate in parts by mass into 60 parts of concentrated sulfuric acid with a temperature of 5°C and a mass fraction of 98% under stirring, and slowly add 18 parts after stirring and mixing evenly. Parts of potassium permanganate, reacted at room temperature for 10 hours, slowly added 200 parts of deionized water, raised the temperature to 68°C and continued to react for 4 hours, then added dropwise 20 parts of hydrogen peroxide solution with a mass fraction of 30%, ultrasonically dispersed for 30 Minutes later, centrifuge, wash repeatedly to remove sulfuric acid, and dry at 60°C to obtain graphene oxide;

[0025] 2) Take 24 parts by mass of allyl polyoxyethylene ether, 0.8 parts of graphene oxide and 0.4 parts of concentrated sulfuric acid with a mass fraction of 98%, mix and stir to raise the temperature to 63 ° C, keep warm and ultrasonically treat for 1.2 hours to obtain oxidize...

Embodiment 3

[0030] 1) Add 6 parts of graphite powder with a particle size of <30 microns and 3 parts of sodium nitrate in parts by mass into 60 parts of concentrated sulfuric acid with a temperature of 5°C and a mass fraction of 98% under stirring, and slowly add 18 parts after stirring and mixing evenly. Parts of potassium permanganate, reacted at room temperature for 10 hours, slowly added 200 parts of deionized water, raised the temperature to 68°C and continued to react for 4 hours, then added dropwise 20 parts of hydrogen peroxide solution with a mass fraction of 30%, ultrasonically dispersed for 30 Minutes later, centrifuge, wash repeatedly to remove sulfuric acid, and dry at 60°C to obtain graphene oxide;

[0031] 2) Take 28 parts by mass of allyl polyoxyethylene ether, 1.2 parts of graphene oxide and 0.8 parts of concentrated sulfuric acid with a mass fraction of 98%, mix and stir to raise the temperature to 68 ° C, keep warm and ultrasonically treat for 1.3 hours to obtain oxidize...

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Abstract

The invention relates to a preparation method of a strengthening and toughening polycarboxylate water reducing agent. The method comprises the following steps of: oxidizing graphite powder by using concentrated sulfuric acid and potassium permanganate, then carrying out ultrasonic separation to obtain graphene oxide structurally containing carboxyl, hydroxyl, epoxy group and the like, and then, subjecting graphene oxide and allyl polyoxylethylene ether to esterification reaction under the action of ultrasonic; then carrying out free radical copolymerization reaction with methacrylic acid and sodium methylacrylsulfonate under the initiation of ammonium persulfate to obtain the strengthening and toughening polycarboxylate water reducing agent. The method provided by the invention has the innovation points as follows: a graphene oxide structure is introduced to the molecule of the polycarboxylate water reducing agent through oxidation, separation, esterification and free radical copolymerization reaction, so that the strength of concrete is increased by the high water-reducing rate of the water reducing agent, and in addition, the graphene also has strengthening and toughening effects for the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture in fine chemical industry, and in particular relates to a preparation method of a polycarboxylate water reducer capable of increasing concrete strength and toughness. Background technique [0002] Concrete is still the most important building material in the world today. The production of concrete requires a large amount of cement, sand, etc. The preparation process of these raw materials consumes a lot of resources and energy, and also produces huge environmental pollution. Today, when reducing resource consumption, reducing energy consumption and advocating a low-carbon economy, improving the strength and service life of concrete and reducing the amount of concrete used in construction are one of the main measures to achieve a low-carbon economy and reduce pollution. The use of high-efficiency and enhanced polycarboxylate superplasticizers is the main method to improve the mechanical ...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/06C08F228/02C04B24/16C04B103/30
Inventor 吕生华李第
Owner 河北圣通建材科技有限公司
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