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Sulfate-resistant organosilicone modified polycarboxylic superplasticizer and preparation method thereof

A superplasticizer and polycarboxylic acid-based technology, which is applied in the field of novel sulfate-resistant silicone-modified polycarboxylic acid-based superplasticizers and their preparation fields, and can solve the problem of compatibility of polycarboxylic acid-based superplasticizers. Problems such as increasing the cost of use of polycarboxylic acid-based superplasticizers

Active Publication Date: 2013-04-03
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfates affect the compatibility of polycarboxylate superplasticizers, which greatly increases the cost of using polycarboxylate superplasticizers in concrete, and has a huge impact on the popularization and application of polycarboxylate superplasticizers. Negative impact

Method used

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  • Sulfate-resistant organosilicone modified polycarboxylic superplasticizer and preparation method thereof
  • Sulfate-resistant organosilicone modified polycarboxylic superplasticizer and preparation method thereof
  • Sulfate-resistant organosilicone modified polycarboxylic superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081]Add 120g of methoxypolyethylene glycol (MPEG, molecular weight 1200), 25.8g of methacrylic acid (MAA), 0.45g of hydroquinone and 0.12g of phen For thiazine, heat to 90°C to melt it completely, then add 3g of concentrated sulfuric acid and continue to heat to 125°C for constant temperature reaction for 5h, cool down to 98°C and vacuumize for 2h, titrate the acid value with NaOH absolute ethanol until the acid value When the measured monohydroxyl esterification rate reaches more than 95%, stop heating to obtain the intermediate macromonomer of polycarboxylic acid superplasticizer----methoxypolyoxyethylene (meth)acrylate (MPEG- MAA-1).

[0082] Then configure each monomer solution and initiator solution in the following proportions:

[0083] Monomer 1 solution: 50g methoxypolyethylene (meth)acrylate (MPEG-MAA-1), 10g acrylic acid, 3g sodium methacrylate sulfonate, 1.2g 3-mercaptopropionic acid and 27g deionized water;

[0084] Monomer 2 solution: 9.5g 3-(methacryloyloxy)p...

Embodiment 2

[0088] Add 120g of methoxypolyethylene glycol (MPEG, molecular weight 1200), 25.8g of methacrylic acid (MAA), 0.45g of hydroquinone and 0.12g of phen For thiazine, heat to 90°C to melt it completely, then add 3g of concentrated sulfuric acid and continue to heat to 125°C for constant temperature reaction for 5h, cool down to 98°C and vacuumize for 2h, titrate the acid value with NaOH absolute ethanol until the acid value When the measured monohydroxyl esterification rate reaches more than 95%, stop heating to obtain the intermediate macromonomer of polycarboxylate superplasticizer ----- methoxypolyoxyethylene (meth)acrylate (MPEG -MAA-2).

[0089] Then configure each monomer solution and initiator solution in the following proportions:

[0090] Monomer 1 solution: 50g methoxypolyethylene (meth)acrylate (MPEG-MAA-2), 10g acrylic acid, 3g sodium methacrylate sulfonate, 1.6g 3-mercaptopropionic acid and 27g deionized water;

[0091] Monomer 2 solution: 15g 3-(methacryloyloxy)pr...

Embodiment 3

[0095] Add 120g of methoxypolyethylene glycol (MPEG, molecular weight 2400), 10g of acrylic acid (AA), 12g of methacrylic acid (MAA), and 1.64g of terephthalic acid into a four-necked flask equipped with a thermometer, a stirrer and a condenser. Phenol and 0.55g of phenothiazine, heated to 90°C to melt them all, then added 4.2g of concentrated sulfuric acid, 1g of p-toluenesulfonic acid and continued to heat to 125°C for 5 hours, then cooled to 98°C for 2 hours of vacuum esterification, Titrate the acid value with NaOH anhydrous ethanol until the esterification rate of the single hydroxyl group measured by the acid value reaches more than 95%, then stop heating to obtain the intermediate macromonomer of the polycarboxylic acid superplasticizer - methoxy Polyoxyethylene (meth)acrylate (MPEG-MAA-3). Then configure each monomer solution and initiator solution in the following proportions:

[0096] Monomer 1 solution: 50g methoxypolyethylene (meth)acrylate (MPEG-MAA-3), 10g acryl...

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Abstract

The invention relates to a sulfate-resistant organosilicone modified polycarboxylic superplasticizer and a preparation method thereof. A novel polycarboxylic superplasticizer is prepared from methoxy-polyoxyethylene (methyl) acrylic esters, organosilicone monomers, carboxylic acid monomers, carboxylic ester monomers and sulfonic acid monomers and the like through free radical polymerization. According to the invention, organosilicone monomers and sulfonic acid monomers are adopted for copolymerization; and by introduced silane bonds and silicate, strong chemical bonds are formed so as to resist the competitive adsorption action of sulfate-resistant ions, thereby reaching the purpose of improving a situation that the polycarboxylic superplasticizer is incompatible with a concrete material with high sulphate content.

Description

technical field [0001] The invention relates to a concrete admixture-polycarboxylic acid superplasticizer and a preparation method thereof, in particular to a kind of polycarboxylate (meth)acrylate, organosilicon monomer, carboxylic acid A novel sulfate-resistant silicone-modified polycarboxylate-based superplasticizer prepared from raw materials such as quasi-monomers, carboxylate monomers, and sulfonic acid monomers, and a preparation method thereof. Background technique [0002] Concrete is the largest and most widely used building material in the world. For decades, concrete technology has entered a new stage of development, and its application range has been further expanded. The development of new technologies such as pumped concrete, self-leveling concrete, underwater non-dispersible concrete, shotcrete, polymer concrete, and high-strength high-performance concrete requires concrete to have the properties of setting adjustment, reducing heat of hydration, fluidity, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/40C08F290/06C08F220/06C08F228/02C08F218/08C08F230/08C08F2/38C04B103/32
Inventor 王栋民刘治华
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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