Polycarboxylate superplasticizer for effectively resisting adverse influence from clay and preparation method of polycarboxylate superplasticizer

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer and its preparation, can solve the problems of reducing PC water reduction and slump retention, and achieves the suppression of adverse effects of clay, mild conditions, and simple reaction steps Effect

Active Publication Date: 2013-01-16
山东建科建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem that clay can reduce the water-reducing and slump-preserving effects of PC, the present inventio

Method used

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  • Polycarboxylate superplasticizer for effectively resisting adverse influence from clay and preparation method of polycarboxylate superplasticizer
  • Polycarboxylate superplasticizer for effectively resisting adverse influence from clay and preparation method of polycarboxylate superplasticizer
  • Polycarboxylate superplasticizer for effectively resisting adverse influence from clay and preparation method of polycarboxylate superplasticizer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Into the 5L reactor, add 0.5 mol methyl alkenyl polyoxyethylene polyoxypropylene ether (R 1 is methyl, m = 30, n = 15), 0.62 mol monomer N-isopropyl methacrylamide, 0.09 mol dodecanethiol and 1000 g deionized water, stirred to dissolve, and heated to 36 °C. 3.34 mol aqueous solution of monomeric acrylic acid, 0.20 mol ammonium persulfate aqueous solution and 0.05 mol sodium bisulfite aqueous solution were added dropwise, the drop was completed within 2.5 hours, and the temperature was kept for 4 hours. After the reaction, cool down to 30°C, add sodium hydroxide to neutralize to pH = 6.8, add water to adjust the solid content to 40%, and obtain a light yellow transparent liquid, which is a polycarboxylate superplasticizer that can effectively resist the adverse effects of clay , The number average molecular weight is 16000.

[0045]In the cement slurry test, when the mud content is 0, the initial expansion degree is 310mm, and the expansion degree is 290mm after 1 hour;...

Embodiment 2

[0048] Into the 5L reactor, add 0.5 mol monomer methyl alkenyl polyoxyethylene polyoxypropylene ether (R 1 is methyl, m = 20, n = 21), 0.62 mol monomer N-(methoxymethyl)-2-acrylamide, 0.04 mol mercaptopropionic acid and 1000 g deionized water, stirred to dissolve, and heated to 40°C. Add dropwise 2.69 mol monomeric acrylic acid aqueous solution, 0.13 mol sodium persulfate aqueous solution and 0.06 mol ascorbic acid aqueous solution, drop it within 3 hours, and keep warm for 3 hours. Cool down to 30°C after the reaction is over, and add potassium hydroxide to neutralize to pH=6.7, and add water to adjust the solid content to 40%, to obtain a light yellow transparent liquid, which is the polycarboxylic acid reducing agent that can effectively resist the adverse effects of clay. Aqua, the number average molecular weight is 12000.

[0049] In the cement slurry test, when the mud content is 0, the initial expansion degree is 315mm, and the expansion degree is 295mm after 1 hour; ...

Embodiment 3

[0052] Into the 5L reactor, add 0.5 mol monomer alkenyl polyoxyethylene polyoxypropylene ether (R 1 is H, m = 25, n = 24), 0.57 mol monomer N-2-(dimethylaminopropyl) methacrylamide, 0.07 mol mercaptoethanol and 1000 g deionized water, stirred to dissolve, and heated to 42°C. Add 2.2 mol monomeric methacrylic acid aqueous solution, 0.08 mol hydrogen peroxide aqueous solution and 0.05 mol ascorbic acid aqueous solution dropwise, drop it within 2.5 hours, and keep warm for 2 hours. Cool down to 30°C after the reaction is over, and add sodium hydroxide to neutralize to pH=6.5, and add water to adjust the solid content to 40%, to obtain a light yellow transparent liquid, which is the polycarboxylic acid reducing agent that can effectively resist the adverse effects of clay. Aqua, number average molecular weight is 10000.

[0053] In the cement slurry test, when the mud content is 0, the initial expansion degree is 310mm, and the expansion degree is 285mm after 1 hour; when the mu...

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Abstract

A polycarboxylate superplasticizer or effectively resisting adverse influence from clay is obtained by copolymerization of a monomer a, namely alkenyl polyoxyethylene polyoxypropylene amine ether, a monomer b, namely acrylic acid or methacrylic acid and a monomer c, namely acrylamide derivative through free radicals, wherein the mol ratio of the monomer a to the monomer b to the monomer c is (11-17):(65-75):(14-18). The polycarboxylate superplasticizer has the advantages of abundant raw material sources, simple reaction steps, mild conditions and no chloride ions in products. The effective doping amount of the polycarboxylate superplasticizer is 0.2-0.3 percent of the total amount of the cementitious materials and can resist the mud content of aggregate within 8 percent.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a polycarboxylate water reducer that can effectively resist the adverse effects of clay and a preparation method thereof. Background technique [0002] Polycarboxylate (PC) water reducing agent has the advantages of high water reducing rate, good dispersion of cement particles, low dosage, good cement adaptability, good slump retention without prolonging the setting and hardening time of concrete. It has been successfully applied to a series of major projects such as high-speed rail, 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. However, in the process of concrete production, the clay contained in the aggregate is inevitably mixed into the cementitious material system. With the increase of clay...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F290/06C04B103/30
Inventor 王勇威刘永生高桂波王立亚王开宇王谦王锦明邢卫国
Owner 山东建科建筑材料有限公司
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