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Preparing method for delayed coagulation carboxylic acid water reducer used for magnesium oxychloride cement

A technology of slow coagulation carboxylic acid and magnesium oxychloride cement, which is applied in the field of cement concrete admixtures, can solve the problems of difficulty in meeting functional, diversified market demands, and few varieties, so as to reduce environmental burden, improve utilization rate, good adaptability

Inactive Publication Date: 2017-04-19
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology for developing polyacid superplasticizers in China is not yet mature, and there are few varieties. It is difficult to meet the functional and diversified market needs, and further development and improvement are needed.

Method used

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Examples

Experimental program
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Effect test

specific Embodiment 1

[0023] A kind of preparation method of the retarding coagulation carboxylic acid superplasticizer that is used for magnesium oxychloride cement, comprises the following steps:

[0024] (1), preparation of monomer mixture

[0025] Add 2 molar parts of acid and 1 molar part of polyether into 2.7 molar parts of water, stir well to obtain a monomer mixture;

[0026] (2), adding the initiator into a certain amount of water, stirring evenly to obtain an initiator solution with a mass concentration of 10%, wherein the amount of the initiator added is 1% of the sum of the acid and polyether mass added in step (1) ;

[0027] (3), adding 0.5 molar parts of chain transfer agent into a four-necked flask filled with 13.2 molar parts of distilled water, heating the four-necked flask while stirring until the temperature of the liquid in the four-necked flask reached 65°C;

[0028] (4), keep current temperature, in 2.2 hours, in the four-neck flask in step (3), continuously add dropwise the...

specific Embodiment 2

[0035] A kind of preparation method of the retarding coagulation carboxylic acid superplasticizer that is used for magnesium oxychloride cement, comprises the following steps:

[0036] (1), preparation of monomer mixture

[0037] Add 6 molar parts of acid and 1 molar part of polyether into 4.1 molar parts of water, and stir to obtain a monomer mixture;

[0038] (2), adding the initiator into a certain amount of water, stirring evenly to obtain an initiator solution with a mass concentration of 12%, wherein the amount of the initiator added is 5% of the sum of the acid and polyether mass added in step (1) ;

[0039] (3), adding 2.5 molar parts of chain transfer agent into a four-necked flask filled with 14.8 molar parts of distilled water, heating the four-necked flask while stirring until the liquid temperature in the four-necked flask reaches 90°C;

[0040] (4), keep the current temperature, in the four-necked flask in the step (3) within 2.7 hours, continue to drop the mon...

specific Embodiment 3

[0047] A kind of preparation method of the retarding coagulation carboxylic acid superplasticizer that is used for magnesium oxychloride cement, comprises the following steps:

[0048] (1), preparation of monomer mixture

[0049] Adding 4 molar parts of acid and 1 molar part of polyether into 3 molar parts of water, stirring evenly to obtain a monomer mixture;

[0050] (2), adding initiator to a certain amount of water, stirring evenly to obtain an initiator solution with a mass concentration of 11%, wherein the amount of initiator added is 3% of the sum of the acid and polyether mass added in step (1) ;

[0051] (3), adding 2 molar parts of chain transfer agent into a four-necked flask filled with 14 molar parts of distilled water, heating the four-necked flask while stirring until the liquid temperature in the four-necked flask reaches 80°C;

[0052] (4), keep current temperature, in 2.5 hours in the four-necked flask in step (3), continuously add dropwise the monomer mixe...

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Abstract

The invention relates to a preparing method for a delayed coagulation carboxylic acid water reducer used for magnesium oxychloride cement. The method comprises the steps that firstly, monomer mixed liquid is prepared; secondly, an initiator is added in water, and a 10%-20% initiator solution is obtained; thirdly, 0.5-2.5 mole parts of a chain transfer agent is added in 13.2-14.8 mole parts of distilled water till the temperature reaches 65 DEG C-90 DEG C; fourthly, the monomer mixed liquid is continuously dripped at a constant speed within 2.2-2.7 h, the initiator solution is continuously dripped at a constant speed within 2.8-3.2 h, the current temperature is kept, and then the reaction is conducted for 1.2-1.7 h; and fifthly, a heating source is turned off till the solution temperature is reduced to 35 DEG C-45 DEG C, the PH of the solution is adjusted to range from 6.2 to 6.7 through the sodium hydroxide water solution, and the delayed coagulation carboxylic acid water reducer used for the magnesium oxychloride cement is obtained.

Description

technical field [0001] The invention relates to the technical field of admixtures for cement concrete, in particular to a preparation method of a slow-coagulation carboxylic acid water reducer for magnesium oxychloride cement. Background technique [0002] Magnesium oxychloride cement is a new type of magnesium air-hardening cementitious material made by mixing light-burned magnesite powder and magnesium chloride aqueous solution in a certain proportion. It has many properties superior to ordinary Portland cement: early strength and rapid hardening, high strength, fire prevention, anticorrosion, insect pest prevention, etc., and has been widely used in building materials. [0003] However, due to the fast setting and hardening speed of magnesium oxychloride cement, it has caused certain difficulties in road construction, and is rarely used on roads on a large scale. Due to the complex and changeable climate, hydrology, and geological conditions in Qinghai and other places, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F228/02C08F2/38C04B24/16C04B103/30
CPCC04B24/165C08F2/38C08F283/065C04B2103/302
Inventor 关博文房建宏陈华鑫马慧冯超熊锐徐安花张纪阳盛燕萍
Owner CHANGAN UNIV
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