Special high performance concrete polycarboxylate superplasticizer and preparation method thereof

An ultra-high performance, polycarboxylic acid technology, applied in the field of polycarboxylate water reducing agent, can solve the gap, can not meet the problems of ultra-high water-reducing and viscosity-reducing properties of ultra-high-performance concrete, and achieves improved early strength and improved retention. slump capacity, the effect of promoting cement hydration

Inactive Publication Date: 2018-10-09
CCCC SHEC WUHAN PORT NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slow-release early-strength polycarboxylate superplasticizer can promote the formation of hydration products and improve the early strength of concrete on the premise of realizing slump-retaining performance, but it cannot meet the ultra-high water-reducing and viscosity-reducing requirements of ultra-high performance concrete. performance requirements
[0006] In short, the above-mentioned patents have successfully prepared polycarboxylate superplasticizers with outstanding functions or multifunctionality. There is still a big gap in the strict requirements of early strength and other comprehensive functions

Method used

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  • Special high performance concrete polycarboxylate superplasticizer and preparation method thereof
  • Special high performance concrete polycarboxylate superplasticizer and preparation method thereof
  • Special high performance concrete polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Synthesis of N-ethyl perfluorooctane sulfonamide acrylate: take benzene as water-carrying agent, concentrated sulfuric acid as catalyst, add N-ethyl perfluorooctane sulfonamide ethanol and acrylic acid in the reactor, Reflux reaction at 110-125°C for 6 hours, heat and distill off the benzene in the reactant after the reaction is completed, cool to room temperature, neutralize the reactant with a mass fraction of 4% sodium hydroxide solution until neutral, then extract with ether, and use The ether layer was washed twice with ionic water, then dried with anhydrous sodium sulfate, and finally the solvent was distilled off under reduced pressure to obtain N-ethyl perfluorooctane sulfonamide acrylate in the form of light yellow liquid. Wherein, the mol ratio of N-ethyl perfluorooctane sulfonamide ethanol and acrylic acid is 1:2;

[0032] (2) Polymerization reaction: Add methallyl polyoxyethylene polyoxypropylene ether with molecular weight of 6000 and m:n of 7:3 and dei...

Embodiment 2

[0034] (1) Synthesis of N-ethyl perfluorooctane sulfonamide acrylate: same as Example 1;

[0035](2) Polymerization reaction: add methallyl polyoxyethylene polyoxypropylene ether with molecular weight of 6000 and m:n of 8:2 and deionized water into the reaction kettle, heat and dissolve at 40-50°C Completely obtain A solution; Add hydrogen peroxide in A solution, and drop the deionized water solution of Bruggolite FF6 reducing agent and the deionized water mixed solution of acrylic acid and N-ethyl perfluorooctane sulfonamide acrylate simultaneously, at 50 Add dropwise at ℃ for 3.0h, keep warm at 50℃ for 1.5h after dripping, cool down to room temperature after the reaction to obtain solution B; ~8, the obtained product is the special polycarboxylate superplasticizer for ultra-high performance concrete, denoted as U2; among them, methallyl polyoxyethylene polyoxypropylene ether, acrylic acid, N-ethyl perfluorooctane sulfonate The molar ratio of amide acrylate, hydrogen peroxid...

Embodiment 3

[0037] (1) Synthesis of N-ethyl perfluorooctane sulfonamide acrylate: same as Example 1;

[0038] (2) Polymerization reaction: add methallyl polyoxyethylene polyoxypropylene ether with a molecular weight of 7000 and m:n of 8:2 and deionized water into the reaction kettle, and heat to dissolve at a temperature of 30-40°C Completely obtain A solution; Add hydrogen peroxide in A solution, and drop the deionized water solution of Bruggolite FF6 reducing agent and the deionized water mixed solution of acrylic acid and N-ethyl perfluorooctyl sulfonamide acrylate simultaneously, at 55 Add dropwise at ℃ for 3.0h, keep warm at 55℃ for 1.5h after dripping, cool down to room temperature after the reaction to obtain solution B; ~8, the obtained product is polycarboxylate superplasticizer for ultra-high performance concrete, denoted as U3; among them, methallyl polyoxyethylene polyoxypropylene ether, acrylic acid, N-ethyl perfluorooctane sulfonate The molar ratio of amide acrylate, hydrog...

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Abstract

The invention discloses a special high performance concrete polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: firstly, heating and dissolving methyl allyl polyoxyethylene polyoxypropylene ether and water in a reaction kettle so as to obtain a solution A; adding hydrogen peroxide into the solution A, respectively dropping a solution of a Bruggolite FF6 reducing agent and a mixed water solution of acrylic acid and N-ethyl perfluorooctyl sulfamide acrylate, carrying out a heat-preservation reaction, and cooling to a room temperature so as to obtain a solution B; finally adding sodium hydroxide into the solution B, and adjusting a pH value to 6-8, so as to obtain the special high performance concrete polycarboxylate superplasticizer. The special high performance concrete polycarboxylate superplasticizer disclosed by the invention has functions of super water reduction, viscosity reduction, slump loss resistance, early strength, and the like, is capable of comprehensively improving comprehensive properties of high performance concrete, and is beneficial to promotion of application and development of the polycarboxylate superplasticizer in the field of concrete.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a special polycarboxylate water reducer for ultra-high performance concrete and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer, as the third generation superplasticizer product, has the advantages of low dosage, high water reducing rate, good slump retention, low shrinkage rate, good volume stability, simple process, green environmental protection, and easy industrialization. It has become an indispensable key component in concrete. However, Ultra High Performance Concrete (UHPC), as a new type of material with ultra-high strength, toughness and durability, due to its ultra-high adhesive content and ultra-low water-binder ratio design, makes the UHPC mixture less fluid and less viscous Large, difficult to discharge air bubbles, poor early strength, which greatly limits its application and development. If the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/06
Inventor 高玉军李顺凯明阳王文荣韦鹏亮陈雍雍
Owner CCCC SHEC WUHAN PORT NEW MATERIALS
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