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Polycarboxylate superplasticizer with three-arm branched structure prepared by one-step method

A high-efficiency water-reducing agent and branched structure technology, applied in the field of concrete admixtures, can solve the problems of complex synthesis process and incomplete reaction, and achieve the effects of simple process, good mud resistance, and increased adsorption capacity

Active Publication Date: 2019-06-14
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is prepared by esterification, the reaction process is reversible, the reaction is not complete, and multi-step reactions are used, the synthesis process is complex, and it is not suitable for industrialization

Method used

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  • Polycarboxylate superplasticizer with three-arm branched structure prepared by one-step method
  • Polycarboxylate superplasticizer with three-arm branched structure prepared by one-step method
  • Polycarboxylate superplasticizer with three-arm branched structure prepared by one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of A solution: In the reactor, add 0.19 g thioglycolic acid, 1.8 g cerium ammonium nitrate, 5.3 g acrylic acid, 23 g deionized water, stir to dissolve, mix well, and obtain A solution;

[0031] (2) Preparation of B solution: In the reactor, add 0.1 g glycerol, 34 g TPEG2400, and 40 g deionized water, stir to dissolve TPEG2400, and mix the solution uniformly to obtain B solution;

[0032] (3) Add solution B to the reactor, raise the temperature to 35°C, add solution A dropwise under constant temperature and stirring conditions, the dropping rate is 8 drops / min, after the addition is completed, react at constant temperature for 4 hours, the reaction is complete, cool After reaching room temperature, adjust the pH to 6-7 with liquid caustic so as to obtain a polycarboxylic acid superplasticizer (marked as PC1) with a three-arm branched structure.

Embodiment 2

[0034] In this example, a polycarboxylic acid superplasticizer (marked as PC2) with a three-arm branched structure was prepared in the same manner as in Example 1, except that the amount of cerium ammonium nitrate in step (1) was 0.5 g.

Embodiment 3

[0036] In this example, a polycarboxylate superplasticizer (marked as PC3) with a three-arm branched structure was prepared in the same manner as in Example 1, except that the reaction time in step (2) was 3 h.

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PUM

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Abstract

The invention relates to a polycarboxylate superplasticizer with a three-arm branched structure prepared by one-step method. The invention is characterized in that the method comprises the following process steps of: stirring and dissolving 0.4-1 percent of a molecular weight regulator, 16-20 percent of acrylic acid and 76-81 percent of deionized water, and conducting uniform mixing to obtain a solution A; stirring 0.035-0.4% of trihydric alcohol, 41-47% of unsaturated polyether, 0.8-3% of an oxidant and 51-53% of deionized water to dissolve the unsaturated polyether, and conducting uniform mixing to obtain a solution B; at 25-40 DEG C, dropwise adding the solution A into the solution B under the conditions of constant temperature and stirring, carrying out a constant-temperature reactionfor 3-6 h after the dropwise adding is completed, cooling to room temperature after the reaction is completed, and adjusting the pH value to 6-7 by using a liquid alkali so as to obtain the polycarboxylate superplasticizer with the three-arm branched structure, wherein the dropwise adding speed is 5-20 drops / min, the volume ratio of the solution A to the solution B is 1:3.

Description

Technical field [0001] The invention belongs to the technical field of concrete admixtures, and particularly relates to a one-step method for preparing a polycarboxylic acid superplasticizer with a three-arm branched structure. Background technique [0002] Polycarboxylic acid superplasticizer is an important concrete admixture. It is a random copolymer obtained by free radical polymerization of carboxyl-containing unsaturated monomers and other unsaturated monomers. Its molecular structure is comb-shaped. It has the characteristics of high water reduction rate, small slump change over time, and good adaptability to cement. [0003] The addition of polycarboxylic acid superplasticizer not only greatly improves the mechanical properties of concrete, but also realizes the modernization of construction technology. Based on the application and development of polycarboxylic acid superplasticizer, concrete materials with different properties and modern construction technology have been ...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F283/06C08F220/06C08F2/38C08F2/10C04B24/26C04B103/30
Inventor 裴梅山李梦霞朱召进
Owner UNIV OF JINAN