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Slow-setting polycarboxylic acid water reducing agent and preparation method thereof

A technology of retarded polycarboxylic acid and water reducing agent, which is applied in the field of retarded polycarboxylic acid high-performance water reducing agent, can solve the problems of inability to meet the requirements of use, poor retardation effect and water reducing effect, etc. Excellent coagulation effect, excellent water-reducing effect, and dissolution-promoting effect

Active Publication Date: 2014-04-09
广东六合新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, my country's slow-setting high-efficiency superplasticizer is still in the development stage. In the future, with the large-scale construction of urban infrastructure and the development of concrete to centralized mixing commercial concrete, for example, the Chinese patent application number 201210569224 provides a slow-setting type The preparation method of polycarboxylate superplasticizer, but because of its poor retarding effect and water reducing effect, it cannot meet the requirements of some special occasions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the first step, weigh 355Kg polyether, 3.4Kg ammonium persulfate, 1.6Kg hydrogen peroxide, the concentration of hydrogen peroxide is 30%, add 170Kg deionized water into the reaction kettle, heat the steam to 60±3°C, and prepare the base material;

[0031] The second step is to prepare material A, weigh 46Kg acrylic acid plus 23Kg deionized water, stir evenly and pump it into the high level tank for later use;

[0032] The third step is to prepare material B, weigh 1.63Kg mercaptoacetic acid and add 132Kg deionized water, stir evenly and pump it into the high level tank for later use;

[0033] In the fourth step, when the temperature of the base material rises to 57°C, start to add material A and material B dropwise at the same time, add material A dropwise for 2 hours, add material B dropwise for 3 hours, and keep warm for 2 hours after the addition is completed, to obtain the mixed solution I;

[0034] Step 5: Weigh 20Kg of caustic soda and add 245Kg of water to for...

Embodiment 2

[0038] In the first step, weigh 340Kg polyether, 2Kg ammonium persulfate, 2Kg hydrogen peroxide, the concentration of hydrogen peroxide is 30%, add 170Kg deionized water into the reaction kettle, heat the steam to 60±3℃, and prepare the base material;

[0039] The second step is to prepare material A, weigh 30Kg acrylic acid plus 23Kg deionized water, stir evenly and pump it into the high level tank for later use;

[0040] The third step is to prepare material B, weigh 1Kg mercaptoacetic acid and add 132Kg deionized water, stir evenly and pump it into the high level tank for later use;

[0041] In the fourth step, when the temperature of the base material rises to 57°C, start to add material A and material B dropwise at the same time, add material A dropwise for 2 hours, add material B dropwise for 3 hours, and keep warm for 2 hours after the addition is completed, to obtain the mixed solution I;

[0042] Step 5: Weigh 10Kg of caustic soda and add 245Kg of water to form a caus...

Embodiment 3

[0046] In the first step, weigh 370Kg polyether, 4Kg ammonium persulfate, 5Kg hydrogen peroxide, the concentration of hydrogen peroxide is 30%, add 170Kg deionized water into the reaction kettle, heat the steam to 60±3°C, and prepare the base material;

[0047] The second step is to prepare material A, weigh 50Kg acrylic acid plus 23Kg deionized water, stir evenly and pump it into the high level tank for later use;

[0048] The third step is to prepare material B, weigh 3Kg of mercaptoacetic acid and add 132Kg of deionized water, stir evenly and pump it into the high level tank for later use;

[0049] In the fourth step, when the temperature of the base material rises to 57°C, start to add material A and material B dropwise at the same time, add material A dropwise for 2 hours, add material B dropwise for 3 hours, and keep warm for 2 hours after the addition is completed, to obtain the mixed solution I;

[0050]Step 5: Weigh 30Kg of caustic soda and add 245Kg of water to form ...

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Abstract

The invention discloses a slow-setting polycarboxylic acid water reducing agent and a preparation method thereof. The water reducing agent is prepared from polyether, ammonium persulfate, oxydol, acrylic acid, mercaptopropionic acid, caustic soda flakes, calcium nitrate, sodium nitrite, deionized water and softened water. By optimizing the proportion of the initiator, bonder and other raw materials, selecting chlorine-free deionized water, using higher-dispersibility softened water, simultaneously using the slow-setting polycarboxylic acid water reducing agent, softened water, calcium nitrate and sodium nitrite and optimizing the reaction parameters, the slow-setting polycarboxylic acid high-performance water reducing agent has the advantages in water reducing rate, bleeding rate, gas content, setting time difference / compression strength ratio, shrinkage ratio and other critical indexes. The slow-setting polycarboxylic acid high-performance water reducing agent has favorable use effect and obvious cost advantage, and is worthy of wide-range popularization.

Description

technical field [0001] The invention specifically relates to a slow-setting polycarboxylate high-performance water reducer, which belongs to the field of building material admixtures. Background technique [0002] Concrete admixtures are indispensable components of modern concrete, which can improve the performance of concrete according to specific requirements. Adding an appropriate amount of retarded water reducer to the concrete can prolong the setting time of the concrete, reduce the loss of slump, ensure the normal construction of the concrete, improve the work efficiency, and the strength of the hardened concrete increases well, which is suitable for long-term use. Concrete that is parked for a long time and transported over a long distance, as well as vibration-free self-compacting concrete, large-volume concrete, and concrete constructed in hot weather. Compared with lignosulfonate water-reducers and naphthalene-based water-reducers, polycarboxylate ester (PCE) high...

Claims

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Application Information

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IPC IPC(8): C04B24/32C08F283/06C08F220/06C04B103/30
Inventor 周永祥
Owner 广东六合新型建材有限公司
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