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Polycarboxylic acid superplasticizer based on lignin based polyether monomer as well as preparation method thereof and application thereof to concrete

A technology of lignin polyether and polyether polycarboxylate, applied in the field of concrete superplasticizer, can solve the problem that polycarboxylate superplasticizer and conventional superplasticizer cannot be used in combination, unclear, lost, and the content of unsaturated double bonds Low problems, to achieve the effect of strong controllability of molecular structure, obvious viscosity reduction and high dispersion performance

Active Publication Date: 2018-04-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polycarboxylate superplasticizers have unavoidable shortcomings, such as: ①The adaptability of polycarboxylate superplasticizers to gelled materials, the polycarboxylate superplasticizers of different manufacturers and different batch numbers are compatible with some The cement will be seriously unsuitable, resulting in the failure of the normal use of the concrete sent to the construction site
②The polycarboxylate superplasticizer is sensitive to the mud content of the sand, and the presence of clay will reduce or even lose the dispersion ability of the polycarboxylate superplasticizer to cement and concrete
③Compatibility between polycarboxylate water reducer and other admixtures, polycarboxylate water reducer has a strong selectivity to compound components, and is "incompatible" with naphthalene water reducer, for polycarboxylate water reducer The mechanism why acid water reducer and conventional water reducer cannot be used in combination is not clear, and there is no good solution at present
However, the content of unsaturated double bonds in lignosulfonate is relatively low, so the reaction efficiency of this method is low, and it is difficult to achieve the modification goal

Method used

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  • Polycarboxylic acid superplasticizer based on lignin based polyether monomer as well as preparation method thereof and application thereof to concrete
  • Polycarboxylic acid superplasticizer based on lignin based polyether monomer as well as preparation method thereof and application thereof to concrete
  • Polycarboxylic acid superplasticizer based on lignin based polyether monomer as well as preparation method thereof and application thereof to concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0055] Embodiment A: Preparation of lignin polyether

[0056] Mix 120g of wheatgrass alkali lignin, 15g of NaOH, and 300g of water, stir mechanically to dissolve all the lignin, and then leave it for 4 to 8 hours until the bubbles disappear to obtain a lignin solution. Heat 100g of unsaturated polyether with a relative molecular weight of 2400 to 60°C to melt it completely, add 0.5g of boron trifluoride-ether solution and 4.5g of epoxychloroethylene dropwise, react for 2 hours, and dissolve the lignin lye Add all of it, raise the temperature to 90°C, and react for 2.5 hours to obtain lignin polyether.

Embodiment B

[0057] Embodiment B: Preparation of lignin polyether

[0058] Take 30g of wheatgrass alkali lignin, 5g of NaOH, and 192g of water, mix them, mechanically stir to dissolve all the lignin, and then leave it for 4 to 8 hours until the bubbles disappear to obtain a lignin solution. Heat 100g of unsaturated polyether with a relative molecular weight of 2400 to 60°C to melt it completely, add 0.5g of boron trifluoride-ether solution and 4.5g of epoxychloroethylene dropwise, react for 2 hours, and dissolve the lignin lye Add all of it, raise the temperature to 90°C, and react for 2.5 hours to obtain lignin polyether.

Embodiment 1

[0059] Embodiment 1: Preparation of lignin polyether polycarboxylate water reducer

[0060] 99g of polyalkoxyalkenyl long-chain unsaturated monomer (TPEG2400), 1.5g of ammonium persulfate and 1g of lignin polyether prepared in Example A were dissolved in 100g of water to obtain a polyether mixed solution; 12.9g of acrylic acid was dissolved in Prepare solution A in 50g of water; dissolve 0.35g of ascorbic acid and 0.5g of mercaptoethanol in 40g of water to prepare solution B;

[0061] Stir the polyether mixture evenly, and raise the temperature to 65°C, then add 2g of ammonium persulfate into the reaction flask at one time, keep stirring mechanically, then add solution A and solution B dropwise respectively, solution A is added dropwise for 3 hours, solution B Add dropwise for 3.5 hours, continue to keep warm for 1.5 hours after solution B is added dropwise, stop the reaction, and when the reaction solution cools down to room temperature, adjust the pH of the reaction solution...

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Abstract

The invention belongs to the technical field of concrete superplasticizer, and discloses a polycarboxylic acid superplasticizer based on a lignin based polyether monomer as well as a preparation method thereof and an application thereof to concrete. The polycarboxylic acid superplasticizer based on the lignin based polyether monomer comprises the following components in parts by mass: 1-40 parts of an unsaturated lignin polyether monomer, 99-60 parts of nonsaturated polyoxyethylene ether, and 9-16 parts of unsaturated carboxylic acids; the superplasticizer is obtained by a chain transfer reaction of the components. The unsaturated lignin polyether monomer is prepared by reaction of the following components in parts by mass: 100 parts of nonsaturated polyoxyethylene ether, and 30-120 partsof lignin. The polycarboxylic acid superplasticizer based on a lignin based polyether monomer has good water retention, and the product has a certain reducing effect for viscosity of a cement system;under the same condition that initial fluidity of concrete is controlled, the more amount of lignin polyether, the more obvious reducing effects of viscosity; the product is good for reducing energy consumption, and can be applied to concrete.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency water reducers for concrete, and in particular relates to a polycarboxylate water reducer based on lignin-based polyether monomers, a preparation method thereof, and an application in concrete. Background technique [0002] Polycarboxylate high-performance water reducer has an irreplaceable position in modern building materials. It has the advantages of low dosage, high water reducing rate, high dispersibility, high slump retention and no pollution in production. In addition, polycarboxylate The molecular structure is highly designable, so that researchers can design the corresponding structure according to the required function. However, polycarboxylate superplasticizers have unavoidable shortcomings, such as: ①The adaptability of polycarboxylate superplasticizers to gelled materials, the polycarboxylate superplasticizers of different manufacturers and different batch numbers are compatib...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F234/02C08F299/02C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/06C08F299/022C08F220/06
Inventor 郑大锋郑涛邱学青杨东杰范雷楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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