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Shrinkage-reducing poly carboxylic acid water reducing agent and preparation method

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylic acid water reducing agent, can solve problems such as long reaction time, and achieve the effect of reducing shrinkage, excellent performance and improving water reducing effect.

Inactive Publication Date: 2013-07-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing agent not only has a high water reducing rate and dispersing performance, but also can reduce the drying shrinkage of concrete well, and the cost is not very high, but the reaction degree of various reactants in this method needs to be improved. Diethylene glycol dipropylene glycol monobutyl ether is not much in China, and the whole reaction time is too long

Method used

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  • Shrinkage-reducing poly carboxylic acid water reducing agent and preparation method
  • Shrinkage-reducing poly carboxylic acid water reducing agent and preparation method
  • Shrinkage-reducing poly carboxylic acid water reducing agent and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Preparation of diethylene glycol dimethyl monobutyl ether maleic anhydride monoester (DGMA)

[0026] Add 2mol maleic anhydride (MAD) into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, heat to 40°C to melt it, then add 1.5mol diethylene glycol monobutyl ether (DGBE) and 0.03 mol (2% of the mass of diethylene glycol dimethyl monobutyl ether) catalyst, p-toluenesulfonic acid (p-TSA) was heated to 80°C, and after constant temperature esterification for 3 hours, the material was cooled and then purified by vacuum filtration. Obtain diethylene glycol monobutyl ether maleic anhydride monoester (DGMA), its molecular formula is as follows:

[0027]

[0028] (2) Preparation of shrinkage-reducing polycarboxylate superplasticizer with diethylene glycol dimethyl monobutyl ether maleic anhydride monoester (DGMA) as raw material

[0029] In the experimental device equipped with a thermometer, a mechanical stirrer, a condensation reflux dev...

Embodiment 2

[0033] (1) Preparation of diethylene glycol dimethyl monobutyl ether maleic anhydride monoester (DGMA)

[0034] Add 3mol maleic anhydride (MAD) into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, heat to 65°C to melt it, then add 0.8mol diethylene glycol monobutyl ether (DGBE) and 0.02 mol (3% of the mass of diethylene glycol dimethyl monobutyl ether) catalyst, p-toluenesulfonic acid (p-TSA) was heated to 140°C, and after constant temperature esterification for 6 hours, the material was cooled and then purified by vacuum filtration. Diethylene glycol monobutyl ether maleic anhydride monoester (DGMA) is obtained.

[0035] (2) Preparation of shrinkage-reducing polycarboxylate superplasticizer with diethylene glycol dimethyl monobutyl ether maleic anhydride monoester (DGMA) as raw material

[0036] In the experimental device equipped with a thermometer, a mechanical stirrer, a condensation reflux device, and a four-necked flask, a mixture of ...

Embodiment 3

[0040] (1) Preparation of diethylene glycol dimethyl monobutyl ether maleic anhydride monoester (DGMA)

[0041] Add 4mol maleic anhydride (MAD) into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, heat to 55°C to melt it, then add 0.5mol diethylene glycol monobutyl ether (DGBE) and 0.02 mol (5% of the mass of diethylene glycol dimethyl monobutyl ether) catalyst, p-toluenesulfonic acid (p-TSA) was heated to 135°C, and after constant temperature esterification for 5 hours, the material was cooled and then purified by vacuum filtration. Diethylene glycol monobutyl ether maleic anhydride monoester (DGMA) is obtained.

[0042] (2) Preparation of shrinkage-reducing polycarboxylate superplasticizer with diethylene glycol dimethyl monobutyl ether maleic anhydride monoester (DGMA) as raw material

[0043] In the experimental device equipped with a thermometer, a mechanical stirrer, a condensing reflux device, and a four-necked flask, add a mixture o...

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Abstract

The invention discloses a method for preparing a poly carboxylic acid water reducing agent. According to the method, sodium methallyl sulfonate, allyl polyethylene glycols, methacrylic acid, diethylene glycol dimethyl monobutyl ether maleic monoester and water are mixed according to an appropriate proportion and are subjected to thermostatic reaction for 3-7 hours under the temperature of 50-100 DEG C under the initiation of the initiator ammonium persulfate, the reaction products are cooled and then the pH value is adjusted to 6-8 by using a NaOH solution to obtain the water solution of macromolecule copolymer, i.e. the shrinkage-reducing poly carboxylic acid water reducing agent. The invention further discloses a novel shrinkage-reducing poly carboxylic acid water reducing agent. The raw materials of the shrinkage-reducing poly carboxylic acid water reducing agent of the invention are abundant in source, and the synthesis process is simple and easily operated; the shrinkage-reducing poly carboxylic acid water reducing agent has good water reducing and shrinkage reducing functions when the mixing amount is lower, can appropriately entrain air, and has better market prospect and economic benefit.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Based on the high requirements for modern buildings, modern concrete is gradually developing towards high strength and high performance. However, due to the brittleness of concrete, the excessive shrinkage of concrete has always been an important factor affecting the quality of concrete engineering. Shrinkage causes cracks inside the concrete, which not only reduces its strength, but also accelerates the deterioration process of the concrete and increases the passage of other harmful substances into the interior of the concrete, which is easy to cause durability problems such as steel bar corrosion and alkali-aggregate reaction. If the shrinkage of concrete can be reduced, the occurrence of internal defects in concrete can be effectively contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F222/20C08F228/02C04B103/30
Inventor 韦江雄余其俊罗锐峰李方贤胡捷张妮田亚坡
Owner SOUTH CHINA UNIV OF TECH
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