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Polycarboxylate superplasticizer with polyphosphonate side chain and preparation method of polycarboxylate superplasticizer

A polyphosphonate and polycarboxylic acid technology, which is applied in the field of building materials, can solve the problems of aggravated loss of plasticizing properties of concrete mixtures, reduced utilization efficiency of water-reducing agents, troubles in on-site pouring, etc., so as to improve the steric hindrance effect. , the effect of reducing hydrophilicity and reducing the concentration of free water

Active Publication Date: 2021-04-30
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mud content within the qualified range has little effect on the strength and durability of hardened concrete, the polyethylene glycol side chains of polycarboxylate superplasticizers are easy to intercalate and adsorb in the soil, which greatly improves the utilization efficiency of superplasticizers. Decrease, the loss of plasticizing performance of concrete mixture is aggravated, which brings troubles to on-site pouring

Method used

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  • Polycarboxylate superplasticizer with polyphosphonate side chain and preparation method of polycarboxylate superplasticizer
  • Polycarboxylate superplasticizer with polyphosphonate side chain and preparation method of polycarboxylate superplasticizer
  • Polycarboxylate superplasticizer with polyphosphonate side chain and preparation method of polycarboxylate superplasticizer

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preparation example Construction

[0038] A preparation method of a polycarboxylate water reducer with a polyphosphonate side chain, used to prepare the polycarboxylate water reducer with a polyphosphonate side chain as claimed in any one of claims 1 to 2, wherein It is characterized in that: comprising the following steps:

[0039] Step 1: Put 2-chloro-2-oxo-1,3,2-dioxaphospholane, monohydric alcohol, solvent A1, and catalyst B1 in the reactor, replace the gas in the reactor with N2, and turn on Stir, react at room temperature for 4 to 7 hours, distill off the solvent, and the product obtained is a reaction intermediate P; the structural formula of the reaction intermediate P is as in formula (II):

[0040]

[0041] (II)

[0042] (II) In the formula, R is the alkyl part of a monohydric alcohol, that is, one of methyl, ethyl, propyl, isopropanol, n-butyl, and isobutyl.

[0043] Step 2: Place the reaction intermediate P, polyethylene glycol monomethyl ether, solvent A2, and catalyst B2 generated in step 1 i...

specific Embodiment 1

[0054] 142.5 parts by mass of 2-chloro-2-oxo-1,3,2-dioxaphospholane, 32 parts by mass of methanol, 3 parts by mass of triethanolamine, mass fraction 500 parts of tetrahydrofuran are placed in the reactor, and N 2 The gas in the reactor was replaced, the stirring device was turned on, and the reaction was carried out at room temperature for 7 hours. After the reaction was completed, it was purified by distillation to obtain 138 parts by mass of the reaction intermediate P1. Then in the reactor equipped with P1, add mass parts as 500 parts of dichloromethane, 50 parts by mass of polyethylene glycol monomethyl ether with a number average molecular weight of 500 and 2.5 parts by mass of isooctanoic acid Sn, using N 2 The gas in the reactor was replaced, the stirring device was turned on, the temperature was controlled at 0-20°C, the ring-opening polymerization was carried out for 1 hour, and the linear macromolecule E1 of polyethylene glycol-polyphosphonate monomethyl ether was o...

specific Embodiment 2

[0058] 142.5 parts by mass of 2-chloro-2-oxo-1,3,2-dioxaphospholane, 60 parts by mass of isopropanol, 3.5 parts by mass of triethanolamine, Mass fraction is 500 parts of tetrahydrofuran placed in the reactor, using N 2 The gas in the reactor was replaced, the stirring device was turned on, and the reaction was carried out at room temperature for 6 hours. After the reaction, distillation and purification were performed to obtain 166 parts by mass of the reaction intermediate P2. Then in the reactor equipped with P2, add mass parts as 500 parts of dichloromethane, 125 parts by mass of polyethylene glycol monomethyl ether with a number average molecular weight of 500 and 4.5 parts by mass of 1, 8-diazabicyclo[5.4.0]undec-7-ene, using N 2 The gas in the reactor was replaced, the stirring device was turned on, the temperature was controlled at 0-20°C, the ring-opening polymerization was carried out for 1 hour, and the linear macromolecule E2 of polyethylene glycol-polyphosphonate ...

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Abstract

The invention discloses a polycarboxylate superplasticizer with a polyphosphonate side chain and a preparation method thereof, wherein the polycarboxylate superplasticizer with the polyphosphonate side chain is of a comb-shaped structure, the side chain is composed of polyethylene glycol-polyphosphonate monomethyl ether, and the number average molecular weight is 10000-100000. The preparation method comprises the following steps: the preparation method comprises the following steps: preparing an intermediate P from 2-chloro-2-oxo-1,3,2-dioxaphospholane and monohydric alcohol under the action of a catalyst, carrying out ring-opening polymerization on the prepared intermediate P and methoxypolyethylene glycol to prepare linear macromolecule E polyethylene glycol-polyphosphonate monomethyl ether, and finally carrying out esterification grafting reaction on the linear macromolecules E and polyacrylic acid S to prepare the polycarboxylate superplasticizer with the polyphosphonate side chain. According to the invention, the side chain of the polyphosphonate side chain polycarboxylate superplasticizer prepared by the invention has amphiphilic characteristics and provides a stronger steric hindrance effect, so that the polyphosphonate side chain polycarboxylate superplasticizer has stronger dispersing capacity than the traditional polycarboxylate superplasticizer; and the side chain can fundamentally inhibit intercalation of the side chain in soil, and has excellent mud resistance and plasticity retention characteristics.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a polycarboxylate water reducer with polyphosphonate side chains and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is a dispersant for concrete mixture. Its main function is to reduce the water consumption of single concrete and make the concrete mixture have good plasticizing performance. In recent years, with the increasing depletion of natural resources, Raw materials such as sand and gravel used in concrete mixtures are in short supply, and the use of a small amount of mud-containing raw materials has become the norm in engineering. Although the mud content within the acceptable range has little effect on the strength and durability of hardened concrete, the polyethylene glycol side chains of polycarboxylate superplasticizers are easy to intercalate and adsorb in the soil, which greatly improves the utilization efficie...

Claims

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Application Information

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IPC IPC(8): C08G81/02C04B24/28C04B103/30
CPCC08G81/025C04B24/246C04B2103/30
Inventor 王学川钱珊珊卢通赵旭彭荩影屈浩杰于鹏程郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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