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Polycarboxylic acid slump retaining agent with low bleeding rate and preparation method thereof

A technology of polycarboxylic acid and slump-retaining agent, which is applied in the field of polycarboxylate slump-retaining agent and its preparation, can solve the problems of large slump loss, poor slump retention, poor workability, etc., and achieve slump retention Good, low slump loss, low bleeding rate

Inactive Publication Date: 2015-10-14
贵州省瓮安新源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of water reducing agent has a high water reducing rate, but in practical applications, it often shows poor slump retention
In addition, the application of existing polycarboxylate superplasticizers in some projects also has problems such as large slump loss, poor workability, and easy bleeding.

Method used

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  • Polycarboxylic acid slump retaining agent with low bleeding rate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Formula: 35g of polyoxyethylene acrylic acid, 28g of acrylic acid, 5g of ammonium persulfate, 2.5g of sodium methacrylate, 2.5g of sodium hydroxide, 5g of thioglycolic acid and 130g of purified water.

[0021] Process:

[0022] 1. Weigh the raw materials of each component according to the formula;

[0023] 2. Raise the temperature of purified water with half of the formula ratio to 42°C, then add acrylic acid polyoxyethylene ether to the water, then add acrylic acid and ammonium persulfate with half the formula ratio, and stir to obtain a mixture; heat to heat the temperature of the mixture to 52°C, then add the remaining amount of acrylic acid, stir, and then raise the temperature of the reaction system to 60°C to obtain the heated material;

[0024] 3. Insulate the heated material in step 2 for 2.5 hours, then add the solution of sodium methacrylate, the remaining amount of ammonium persulfate and the remaining amount of purified water dropwise into the...

Embodiment 2

[0026] Formula: 38g of polyoxyethylene acrylic acid, 35g of acrylic acid, 8g of ammonium persulfate, 3g of sodium methacrylate, 3g of sodium hydroxide, 8g of thioglycolic acid and 150g of purified water.

[0027] Process:

[0028] 1. Weigh the raw materials of each component according to the formula;

[0029] 2. Raise the temperature of purified water with half the proportion of the formula to 45°C, then add polyoxyethylene acrylic acid ether to the water, then add acrylic acid and ammonium persulfate with half the proportion of the formula, stir to obtain a mixture; heat to heat the temperature of the mixture to 55°C, then add the remaining amount of acrylic acid, stir, and then raise the temperature of the reaction system to 60°C to obtain the heated material;

[0030] 3. Insulate the material after the temperature rise in step 2 for 3 hours, then dropwise add the solution of sodium methacrylate, the remaining amount of ammonium persulfate and the remaining amo...

Embodiment 3

[0032] Formula: 33g of polyoxyethylene acrylic acid, 25g of acrylic acid, 3g of ammonium persulfate, 2g of sodium methacrylate, 2g of sodium hydroxide, 3g of thioglycolic acid and 120g of purified water.

[0033] Process:

[0034] 1. Weigh the raw materials of each component according to the formula;

[0035] 2. Raise the temperature of purified water with half of the formula ratio to 40-45°C, then add acrylic acid polyoxyethylene ether to the water, then add acrylic acid and ammonium persulfate with half the formula ratio, and stir to obtain a mixture; Heating the temperature to 50-55°C, then adding the remaining amount of acrylic acid, stirring, and then raising the temperature of the reaction system to 58-62°C to obtain the heated material;

[0036] 3. Insulate the heated material in step 2 for 2-3 hours, then add the solution of sodium methacrylate, the remaining amount of ammonium persulfate and the remaining amount of purified water dropwise into the reac...

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Abstract

The invention discloses a polycarboxylic acid slump retaining agent with low bleeding rate and a preparation method thereof. The slump retaining agent is mainly prepared from acrylic polyoxyethylene ether, acrylic acid, ammonium persulfate, sodium methallyl sulfonate, sodium hydroxide, mercaptoacetic acid and purified water. The prepared polycarboxylic acid slump retaining agent has advantages of good slump retain, low slump loss, good workability, low bleeding rate and strong cement adaptability. The preparation technology is also simple and the slump retaining agent is easy to prepare.

Description

technical field [0001] The invention relates to a polycarboxylate slump retaining agent and a preparation method thereof, in particular to a polycarboxylate slump retainer with low bleeding rate and a preparation method thereof. Background technique [0002] The development process of concrete admixtures can be roughly divided into three stages, ordinary water reducers based on lignin sulfonate and sugar calcium; naphthalene sulfonate formaldehyde condensate, melamine formaldehyde condensate, sulfamic acid High-efficiency water-reducer based on salt-formaldehyde condensate; and polycarboxylate water-reducer is a third-generation chemically synthesized high-performance admixture. Compared with high-efficiency water reducers, polycarboxylate water reducers are favored by users for their high water reducing rate, low dosage, no bleeding, no segregation, and good concrete slump retention. However, due to the late start of domestic polycarboxylate superplasticizers, the current...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02
Inventor 陈保华
Owner 贵州省瓮安新源新材料有限公司
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