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A hyperbranched polymer viscosity reducer for high-strength concrete and preparation method thereof

A technology of hyperbranched polymer and viscosity reducer, applied in the field of concrete admixtures, can solve the problem of not using hyperbranched viscosity reducer, and achieve the effects of reducing the risk of cracking, improving repulsion, and large space volume

Active Publication Date: 2022-04-01
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although existing hyperbranched polymers are used as retarders, they have not been used as hyperbranched viscosity reducers

Method used

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  • A hyperbranched polymer viscosity reducer for high-strength concrete and preparation method thereof
  • A hyperbranched polymer viscosity reducer for high-strength concrete and preparation method thereof
  • A hyperbranched polymer viscosity reducer for high-strength concrete and preparation method thereof

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preparation example Construction

[0030] A preparation method for hyperbranched polymer viscosity reducer for high-strength concrete, comprising the following steps:

[0031] Step 1: Ring-opening reaction between primary amino group and epichlorohydrin: dissolve the benzene ring compound with two or more primary amino functional groups in an aprotic polar solvent, add a catalyst, and heat up to 60-100 ℃; then dropwise add epichlorohydrin solution, fully react, remove the solvent and dry to obtain compound A; wherein the molar ratio of benzene ring compound and epichlorohydrin is 1:3-10.

[0032] The benzene ring compounds are 1,3,5-triaminobenzene, p-phenylenediamine, p-diaminobiphenyl, 4,4'-diaminodiphenylmethane, 1,4-xylylenediamine, 2,4,6 -Triethylbenzene-1,3,5-trimethylamine, 4,4',4"-(1,3,5-triazine-2,4,6-triyl) triphenylamine. Not Protic polar solvents are benzene, toluene, xylene, cyclohexane, chloroform, dimethyl sulfoxide, N,N-dimethylformamide, 1,3-dimethyl-3.4,5,6-tetra Hydrogen-2-pyrimidinone, eth...

Embodiment 1

[0042] Prepare a hyperbranched polymer viscosity reducer for high-strength concrete according to the following steps:

[0043] Step 1: Weigh 0.5 mol of 1,3,5-triaminobenzene and dissolve it in an aprotic polar solvent; then add a mixed catalyst consisting of triethylbenzylammonium chloride and tetraethylammonium bromide. After heating to 80° C., 3.0 mol of epichlorohydrin was added dropwise within 0.5 hours and then kept for 2.0 hours. After removing the solvent from the obtained solution by a rotary evaporator, compound A was obtained after vacuum drying at room temperature for 24.0 hours.

[0044] The amount of the aprotic polar solvent used is not particularly limited, and is generally subject to the ability to dissolve the solid raw material. It can be 50-1000 parts by weight of the total mass of solid raw materials, preferably 100 parts by weight in this embodiment. Aprotic polar solvents are dimethylsulfoxide, N,N-dimethylformamide, 1,3-dimethyl-3,4,5,6-tetrahydro-2-py...

Embodiment 2

[0049] Prepare a hyperbranched polymer viscosity reducer for high-strength concrete according to the following steps:

[0050] Step 1: Weigh 0.5 mol of p-phenylenediamine and dissolve it in an aprotic polar solvent; then add a mixed catalyst consisting of triethylbenzylammonium chloride and tetraethylammonium bromide. After heating to 80° C., 2.0 mol of epichlorohydrin was added dropwise within 0.5 hours and then kept for 2.0 hours. After removing the solvent from the obtained solution by a rotary evaporator, compound A was obtained after vacuum drying at room temperature for 24.0 hours.

[0051] The amount of the aprotic polar solvent used is not particularly limited, and is generally subject to the ability to dissolve the solid raw material. It can be 50-1000 parts by weight of the total mass of solid raw materials, preferably 100 parts by weight in this embodiment. The aprotic polar solvent is a mixed solvent composed of dimethyl sulfoxide, chloroform, and 1,3-dimethyl-3,...

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Abstract

The invention relates to a hyperbranched polymer viscosity reducer for high-strength concrete and a preparation method thereof. Step 1: Carrying out a ring-opening reaction between a benzene ring compound having two or more primary amino functional groups and epichlorohydrin to obtain Compound A; Step 2: compound A and solid base ring closure reaction to obtain glycidylamine compound B 1 ; Step 3: Glycidylamine Compound B 1 Carry out ring-opening and ring-closing reactions M times to obtain compound B 1+M , M≥0; Step 4: Glycidylamine compound B 1+M , monomethyl ether and the sodium hydroxide solution whose mass concentration is 50wt% can be reacted to obtain the required hyperbranched polymer viscosity reducer; the present invention relies on the low viscosity, high solubility and larger space volume characteristics of the hyperbranched polymer, Effectively reduce the entanglement between polycarboxylate superplasticizer chains and increase the occupancy of unadsorbed sites on the surface of cement particles, improve the dispersion performance of the superplasticizer and the thickness of the adsorption layer on the surface of the cementitious material particles.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a hyperbranched polymer viscosity reducer for high-strength concrete and a preparation method thereof. Background technique [0002] With the development of my country's construction industry, high-rise and super high-rise buildings are increasing. Super high-rise pumped concrete has the characteristics of high specific strength, large load capacity, excellent durability, and resource and energy saving. However, in actual production, the low water-binder ratio, the large amount of cementitious materials, and the variety of mineral admixtures lead to high viscosity of the concrete mixture, causing a series of construction problems such as concrete mixing, transportation, and pumping. [0003] Low viscosity and high fluidity are typical characteristics of modern concrete, and they are also the key guarantees for the development of high-rise and super high-rise building technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C04B24/32
CPCC08G83/005C04B24/32C04B2103/34
Inventor 高育欣杨文王福涛曾超王军刘明毕耀张磊王鹏
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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