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Phosphorous acid concrete super plasticizer with polyethyleneimine structure as well as preparation method and application thereof

A technology of polyethyleneimine and superplasticizer, which is applied in the field of concrete admixtures, can solve the problems of prolonged setting delay, setting delay, and high cost of water-reducing agent preparation, and achieve improved fluidity, good working performance, and simple preparation method effective effect

Active Publication Date: 2016-04-20
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This compound is used as a water reducer to effectively maintain the slump spread of concrete. However, the preparation cost of this water reducer is high, and it can cause setting delay, and the setting delay is prolonged with the increase in the amount of additives.

Method used

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  • Phosphorous acid concrete super plasticizer with polyethyleneimine structure as well as preparation method and application thereof
  • Phosphorous acid concrete super plasticizer with polyethyleneimine structure as well as preparation method and application thereof
  • Phosphorous acid concrete super plasticizer with polyethyleneimine structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In a glass reactor equipped with a thermometer and a stirrer, add 105 g of deionized water, and simultaneously add 60 g of MPEG-Cl-1000 (molecular weight 1000, 0.06 mol, m=24) and 10 g of PEI (molecular weight 1000, 0.01 mol, n+p= 24), the molar ratio of chlorinated polyether to imino H is 1:4, the temperature is raised to 30°C while stirring to dissolve, and the temperature is continued to rise to 100°C for 8 hours to obtain a 40% PEI-EO aqueous solution. Then 16 mL of HCl (mass concentration: 37%, 0.19 mol, 18.74 g) was added and stirred evenly. Then add H 3 PO 3 (0.19mol, 15.58g) and aqueous formaldehyde (mass concentration is 37%, 0.19mol, 15.42g) (polyethyleneimine, H 3 PO 3 , HCHO, HCl molar ratio is 1:19:19:19). Stir well. And react at 100° C. for 12 hours. A red transparent solution with a mass concentration of 43.7% was obtained, the polymer molecular weight was 8900, and the acid-ether ratio was 19:6.

Embodiment 2

[0051] In the glass reactor equipped with thermometer and stirrer, add 350g deionized water, add 150g MPEG-Cl-5000 (molecular weight 5000, 0.03mol, m=114) and 10gPEI (molecular weight 1000, 0.01mol, n+p= 24), the molar ratio of chlorinated polyether to imino H is 1:8, the temperature is raised to 60°C while stirring to dissolve, and the temperature is continued to rise to 140°C for 7 hours to obtain a 31.3% PEI-EO aqueous solution. Then 17.5 mL of HCl (mass concentration: 37%, 0.21 mol, 20.71 g) was added and stirred evenly. Then add H 3 PO 3 (0.21mol, 17.22g) and formaldehyde aqueous solution (mass concentration is 37%, 0.21mol, 17.04g) (polyethyleneimine, H 3 PO 3 , HCHO, HCl molar ratio is 1:21:21:21). Stir well. And react at 120° C. for 24 hours. A red transparent solution with a mass concentration of 33.83% was obtained, the molecular weight of the polymer was 19000, and the acid-ether ratio was 21:3.

Embodiment 3

[0053] In the glass reactor equipped with thermometer and stirrer, add 140g deionized water, add 192g MPEG-Cl-2400 (molecular weight 2400, 0.08mol, m=55) and 10gPEI (molecular weight 1000, 0.01mol, n+p= 24), the molar ratio of chlorinated polyether to imino H is 1:3, the temperature is raised to 40°C while stirring to dissolve, and the temperature is continued to rise to 130°C for 6 hours to obtain a 59.1% PEI-EO aqueous solution. Then 15 mL of HCl (mass concentration: 37%, 0.18 mol, 17.75 g) was added and stirred evenly. Then add H 3 PO 3 (0.18mol, 14.76g) and formaldehyde aqueous solution (mass concentration is 37%, 0.18mol, 14.6g) (polyethyleneimine, H 3 PO 3 , HCHO, HCl molar ratio is 1:18:18:18). Stir well. And react at 110° C. for 14 hours. A reddish-brown transparent solution with a mass concentration of 58.78% was obtained, the molecular weight of the polymer was 22000, and the acid-ether ratio was 9:4.

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Abstract

The invention provides a new phosphorous acid concrete super plasticizer with a polyethyleneimine structure as well as a preparation method and an application thereof. The phosphorous acid concrete super plasticizer with a polyethyleneimine structure can effectively improve the concrete fluidity, and the preparation method is simple and effective. The preparation method comprises the following steps: a) making chloro-substituted polyether react with polyethyleneimine so that a part of amino groups H of the polyethyleneimine are substituted to obtain polyethyleneimine with a polyoxyethylene ether branch structure, wherein the molar ratio of the chloro-substituted polyether to the imino groups contained in the polyethyleneimine is 1:(3-8); and b) performing phosphorylation of the remaining amino groups H of the polyethyleneimine with a polyoxyethylene ether branch structure to obtain the phosphorous acid concrete super plasticizer with a polyethyleneimine structure.

Description

technical field [0001] The invention relates to a phosphorous acid superplasticizer with a polyethyleneimine structure, a preparation method and application thereof, and belongs to the technical field of concrete admixtures. Background technique [0002] With the rapid development of my country's economy, modern buildings show a trend of super-long-span and super-high-rise development, which puts forward higher requirements for the strength and durability of concrete. The addition of high-performance polymer dispersants to concrete is the most effective, economical, and easiest technical way to reduce cement consumption, increase the utilization rate of industrial waste residue, and achieve high durability and performance improvement of concrete. At present, high-performance polymeric dispersants are mainly based on polycarboxylate superplasticizers. These polycarboxylate polymers can increase the fluidity of cement, thereby reducing water consumption and making concrete ma...

Claims

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Application Information

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IPC IPC(8): C08G81/00C04B24/28C04B103/32
CPCC04B24/246C04B2103/32C08G81/00
Inventor 冉千平宋峰岩王涛亓帅舒鑫马建峰范士敏
Owner JIANGSU SOBUTE NEW MATERIALS
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