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Star-shaped amphoteric polycarboxylate superplasticizer and preparation method thereof

A technology of amphoteric polycarboxylic acid and water reducer, which is applied in the field of concrete admixture in building materials, to achieve the effects of high adaptability and dispersibility, high water reducing rate and narrow molecular weight distribution

Active Publication Date: 2017-05-31
SHANDONG JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results of the current search are: most of the polycarboxylate superplasticizers described in patents mainly achieve the anti-mud effect by adjusting the content of their own components or compounding with anti-mud agents, and few of them change the polymer structure through molecular structure design or use New polymerization method achieves its excellent application performance

Method used

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  • Star-shaped amphoteric polycarboxylate superplasticizer and preparation method thereof
  • Star-shaped amphoteric polycarboxylate superplasticizer and preparation method thereof
  • Star-shaped amphoteric polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of Star Initiator

[0032] β-cyclodextrin (11.35g, 0.01mol) was dissolved in 60mL of anhydrous N,N-dimethylformamide (DMF), added to a 100mL three-necked flask, and then triethylamine (7.07g, 0.07 mol) as a proton absorber. Stir in an ice-water bath for 0.5 h under nitrogen atmosphere. 2-Bromoisobutyryl bromide (16.1 g, 0.07 mol) was dissolved in 10 mL of anhydrous DMF, then added to a constant pressure dropping funnel, and added drop by drop into a three-necked flask. After the dropwise addition was completed, the reaction was carried out at room temperature for 24 h under nitrogen atmosphere. After the reaction, filter the reaction solution, put the filtrate in a separatory funnel, wash it with saturated sodium bicarbonate solution to remove the residual triethylamine salt, then wash it with deionized water until it is neutral, dry it and remove most of the solvent by rotary evaporation Then add dropwise to cold diethyl ether to precipitate, filter,...

Embodiment 2

[0040] In this example, a star-shaped polycarboxylate superplasticizer (marked as P2) was prepared in the same manner as in Example 1, the only difference being that the amount of methacryloyloxyethyltrimethylammonium chloride was 0.2, and the amount of methacrylic acid hydroxyl The amount of ethyl ester is 0, so that initiator, polyethylene glycol methacrylate, sodium methacrylate, methacryloyloxyethyltrimethylammonium chloride, hydroxyethyl methacrylate, catalyst, ligand The molar ratio is 1:35:105:20:0:7:7.

[0041] In this embodiment, the slurry fluidity and soil resistance performance are tested in the same manner as in Example 1, and the test results are shown in Table 1.

Embodiment 3

[0043] In this example, a star-shaped polycarboxylate water reducer (marked as P3) was prepared in the same manner as in Example 1, except that the molecular weight of polyethylene glycol methacrylate in step (2) was 1000 g / mol.

[0044] In this embodiment, the slurry fluidity and soil resistance performance are tested in the same manner as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention discloses a star-shaped amphoteric polycarboxylate superplasticizer and a preparation method thereof. The method includes: esterfying cyclodextrin to obtain a star-shaped initiator, initiating atom transfer radical polymerization of (methyl) polyethylene glycol acrylate, (methyl) sodium acrylate, (methyl) acryloyloxyethyl trimethyl ammonium chloride and (methyl) hydroxylethyl acrylate to obtain a star-shaped copolymer of the four monomers, and conducting further treatment to obtain a star-shaped amphoteric polycarboxylate superplasticizer with a solid content of 20%. The polycarboxylate superplasticizer prepared by the method provided by the invention has high water reducing rate and good mud resistance, meets high construction requirements, and has good application prospect.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to a star-shaped amphoteric polycarboxylate water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures in building materials. Background technique [0002] Polycarboxylate superplasticizer, as the third generation of high-performance concrete superplasticizer, has outstanding advantages such as low dosage, high water reducing rate, good slump retention performance, strong molecular structure adjustability, and high performance potential. Used in a series of major projects such as high-speed railways, bridges, and tunnels. However, polycarboxylate high-efficiency superplasticizers also encounter many technical difficulties in practical applications, such as adaptability to cement / admixtures, sensitivity to the amount of superplasticizer and water consumption, and aggregate mud content, The influence of temperature etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F251/00C08F220/06C08F220/34C08F220/28C08B37/16C04B24/38C04B103/30
CPCC04B24/38C04B2103/302C08B37/0012C08F251/00C08F290/062C08F2438/01C08F220/06
Inventor 唐新德胡秀颖徐大举徐静庞来学周德杰潘义川
Owner SHANDONG JIAOTONG UNIV
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