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One-step preparation of polycarboxylate superplasticizer with four-arm branched structure

A high-efficiency water reducer and branched structure technology, applied in the field of concrete admixtures, can solve the problems of complex synthesis process and incomplete reaction

Active Publication Date: 2021-08-20
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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  • One-step preparation of polycarboxylate superplasticizer with four-arm branched structure
  • One-step preparation of polycarboxylate superplasticizer with four-arm branched structure
  • One-step preparation of polycarboxylate superplasticizer with four-arm branched structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of A solution: In the reactor, add 0.18 g of thioglycolic acid, 1.69 g of cerium ammonium nitrate, 5.7 g of acrylic acid, and 25 g of deionized water, stir to dissolve, and mix well to obtain A solution;

[0031] (2) Solution B preparation: In the reactor, add 0.1 g pentaerythritol, 39 g TPEG2400, 45 g deionized water, stir to dissolve TPEG2400, and mix the solution evenly to obtain B solution;

[0032] (3) Add solution B into the reactor, raise the temperature to 30°C, add solution A dropwise under constant temperature and stirring conditions, the dropping rate is 10 drops / min, and then react at constant temperature for 4 hours after the dropwise addition, after the reaction is completed, cool After reaching room temperature, adjust the pH to 6-7 with liquid caustic soda to obtain a polycarboxylate high-efficiency water reducer (marked as PC1) with a four-arm branched structure.

Embodiment 2

[0034] In this example, a polycarboxylate high-efficiency water reducer (marked as PC2) with a four-arm branched structure was prepared in the same manner as in Example 1, except that the amount of ammonium cerium nitrate in step (1) was 0.8 g.

Embodiment 3

[0036] In this example, a polycarboxylate high-efficiency water reducer (marked as PC3) with a four-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 one-step method for preparing a polycarboxylate high-efficiency water reducer with a four-arm branched structure, which is characterized in that the method has the following process steps: using a molecular weight regulator: 0.3-0.8%, acrylic acid: 14-19%, and deionized Water: 78-84%, stir to dissolve, mix evenly to get A solution; use tetrahydric alcohol: 0.1-0.4%, unsaturated polyether: 43-47%, oxidant: 1-5%, deionized water: 50- 53%, stir to dissolve the unsaturated polyether, and mix evenly to obtain solution B; at 25-35°C, add solution A dropwise to solution B under constant temperature and stirring conditions, the dropping rate is 5-20 drops / min, solution A The volume ratio to solution B is 1:3, after the dropwise addition is completed, then react at a constant temperature for 3-6 hours. After the reaction is completed, after cooling to room temperature, adjust the pH to 6-7 with liquid caustic soda to obtain a four-armed branched structure High-efficiency polycarboxylate superplasticizer.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a one-step method for preparing a polycarboxylate high-efficiency water reducer with a four-arm branched structure. Background technique [0002] Polycarboxylate high-efficiency water reducer is an important concrete admixture. It is a random copolymer obtained by free radical polymerization of unsaturated monomers containing carboxyl groups and other unsaturated monomers. Its molecular structure is comb-shaped. It has the characteristics of high water reducing rate, small change in slump over time, and good adaptability to cement. [0003] The addition of polycarboxylate high-efficiency water reducer not only greatly improves the mechanical properties of concrete, but also realizes the modernization of construction technology. Based on the application and development of polycarboxylate high-efficiency water reducer, concrete materials with different properties and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F2/38C08F4/30C04B24/26C04B103/30
Inventor 裴梅山李梦霞朱召进
Owner UNIV OF JINAN