Assistant for polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water-reducing agent, which is applied in the field of material preparation, can solve problems such as unseen, reaction conditions limit industrialization promotion, reduce PC water-reducing effect, etc., and achieve the effect of simple reaction

Inactive Publication Date: 2013-01-30
SHANDONG PROVINCIAL ACAD OF BUILDING RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of negatively charged carboxyl groups on the side chain of PC will reduce the water-reducing effect of PC to a certain extent, and the complexity of the reaction conditions also limits the industrialization of this PC. So far, no relevant practical engineering applications have been seen. example

Method used

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  • Assistant for polycarboxylic acid water reducing agent and preparation method thereof
  • Assistant for polycarboxylic acid water reducing agent and preparation method thereof
  • Assistant for polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 12.5 grams of 3-mercaptopropionic acid, 2.5 grams of EDTA, 10 grams of sodium phosphate and 750 grams of water were added to a 3-liter reactor with stirring, and the temperature began to rise. After the temperature was raised to 40°C, solutions B and C were added dropwise, wherein solution B consisted of 89 grams of methacrylamide, 861 grams of diallylamine and 375 grams of water, solution C was 22.5 grams of azobisisobutyronitrile, 2.5 grams of ascorbic acid and 375 grams of water. Adding time is controlled at 3 hours. After the solution B and C are added dropwise, continue to heat up to 50°C, and after 4 hours of reaction, cool down to below 30°C within 10 minutes, and then obtain the auxiliary agent for inhibiting the adverse effects of clay, with a solid content of 40%. The number average molecular weight measured by gel permeation chromatography was 500.

[0037] In the cement paste test, the example was mixed with 40% PC water reducer at a ratio of 1:5. W...

Embodiment 2

[0040] 37.5 grams of thioglycolic acid, 2.5 grams of EDTA, 15 grams of isobutanol and 700 grams of water were stirred into a 3-liter reactor, and the temperature began to rise. After the temperature was raised to 50°C, solutions B and C were added dropwise. Wherein B solution is composed of 72 grams of acrylamide, 978 grams of dimethyl allylamine and 300 grams of water; C solution is 66.5 grams of hydrogen peroxide, 28.5 grams of sodium bisulfite and 300 grams of water. Solution B and C dropwise control in 2 hours. Continue to raise the temperature to 60°C. After reacting for 3.5 hours, cool down to below 30°C within 10 minutes, and then get the auxiliary agent for suppressing the adverse effects of clay, the solid content is 48%, and the number average molecular weight is measured by gel permeation chromatography. for 620.

[0041] In the cement slurry test, the example was mixed with 40% PC water reducing agent at a ratio of 1:5. When the mud content was 0, the init...

Embodiment 3

[0044] 25 grams of mercaptoethanol, 4 grams of EDTA, 18.5 grams of triethanolamine, and 600 grams of water were added to a 3-liter reactor with stirring, and the temperature began to rise. After the temperature was raised to 60°C, solutions B and C were added dropwise. Wherein B solution is composed of 95 grams of acrylamide, 1080 grams of dimethylaminoethyl methacrylate and 275 grams of water; C solution is 102 grams of benzoyl peroxide, 25.5 grams of formaldehyde and 275 grams of water. Adding time is controlled at 1 hour. Raise the temperature to 70°C, continue the reaction for 2.5 hours, then cool down to below 30°C within 10 minutes, and then get the auxiliary agent for suppressing the adverse effects of clay, the solid content is 54%, and the number average molecular weight is measured by gel permeation chromatography for 840.

[0045] In the cement paste test, the embodiment is mixed with 40% PC water reducer at a ratio of 1:5. When the mud content is 0, the in...

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Abstract

In order to overcome the phenomenon that the existing polycarboxylic acid water reducing agent is hypersensitive to slime contained in aggregate, the invention provides an assistant which can effectively inhibit the influence of the slime on the polycarboxylic acid water reducing agent and a preparation method thereof. The assistant for the polycarboxylic acid water reducing agent is a product obtained by the polymerization of an acrylamide monomer and an amine-alkene-containing monomer under the initiation effect of an initiator, wherein the amine-alkene-containing monomer specifically refers to one of dimethylallyl amine, diallyl amine, dimethylaminoethyl methacrylate or dimethylaminoethyl acrylate. The assistant provided by the invention can well inhibit the influence of the slime contained in aggregate on the polycarboxylic acid water reducing agent and keep a favorable working state. Besides, the preparation method provided by the invention has simple reaction conditions and is applicable to industrial production; and the obtained product contains no chloride ion.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to an auxiliary agent capable of effectively inhibiting the adverse effect of clay on the water-reducing effect of a polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] Polycarboxylate (PC) water reducer is a new type of high-performance water reducer following naphthalene, aliphatic and sulfamate-based water reducers. It has high water-reducing rate and good dispersion of cement particles. , low dosage, good cement adaptability, good slump retention without prolonging the setting and hardening time of concrete, etc., it has been successfully applied to a series of major projects such as high-speed railways, bridges, and tunnels. In the future, with the gradual improvement of engineering quality requirements and the gradual increase of high-performance concrete demand, the application range of PC will be further expanded. But in the actual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F226/02C08F226/04C08F220/34C08F220/56C08F4/40C08F2/38
Inventor 高桂波王立亚王勇威刘永生王锦明邢卫国王开宇王谦
Owner SHANDONG PROVINCIAL ACAD OF BUILDING RES
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