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Lignin-based polycarboxylate superplasticizer as well as preparation method and application thereof

A technology of lignin and polycarboxylic acid, which is applied in the field of high-efficiency water reducing agents, can solve the problems of difficult construction and pumping, failure to achieve heat preservation effect, high viscosity of concrete, etc., and achieves no stratified segregation, excellent water retention performance, and cement Good workability

Active Publication Date: 2021-04-13
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 some disadvantages
For example, it is difficult to solve the problem of excessive viscosity of concrete at low water-cement ratio, and the air-entraining property is poor
Concrete prepared under the condition of low water-cement ratio is relatively viscous, difficult to construct and pump, and cannot achieve good thermal insulation effect

Method used

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  • Lignin-based polycarboxylate superplasticizer as well as preparation method and application thereof
  • Lignin-based polycarboxylate superplasticizer as well as preparation method and application thereof
  • Lignin-based polycarboxylate superplasticizer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of lignin polycarboxylate water reducer

[0038] Dissolve 98g TPEG-2400 in 300ml dimethylformamide, pass N 2 For protection, add 0.98g initiator azobisisobutyronitrile and 1g chain transfer agent biscarboxymethyl trithiocarbonate, stir and react at 80°C for 8h, then add 10g acrylic acid, and supplement 0.1g initiator, continue The reaction was stirred for 4h, and finally 2g of unsaturated lignin ester monomer was added, and 0.02g of the initiator azobisisobutyronitrile was added. After the reaction for 8h, it was washed with isopropanol for several times after being removed by rotary evaporation, and the product was collected. The product lignin polycarboxylic acid can be obtained by drying in a vacuum oven at 50°C.

Embodiment 2

[0039] Example 2: Preparation of lignin polycarboxylate water reducer

[0040] Dissolve 95g TPEG-2400 in 300ml dimethylformamide, pass N 2 For protection, add 0.95g initiator azobisisobutyronitrile and 1g chain transfer agent biscarboxymethyl trithiocarbonate, stir and react at 80°C for 8h, then add 10g acrylic acid, and supplement 0.1g initiator, continue The reaction was stirred for 4h, and finally 5g of unsaturated lignin ester monomer was added, and 0.05g of the initiator azobisisobutyronitrile was added. After the reaction for 8h, the product was washed with isopropanol for several times after being removed by rotary evaporation, and the product was collected. The product lignin polycarboxylic acid can be obtained by drying in a vacuum oven at 50°C.

Embodiment 3

[0041] Example 3: Preparation of lignin polycarboxylate water reducer

[0042] Dissolve 90g TPEG-2400 in 300ml dimethylformamide, pass N 2For protection, add 0.9g initiator azobisisobutyronitrile and 1g chain transfer agent biscarboxymethyl trithiocarbonate, stir and react at 80°C for 8h, then add 10g acrylic acid, and supplement 0.1g initiator, continue The reaction was stirred for 4 hours, and finally 10 g of unsaturated lignin ester monomer was added, and 0.1 g of the initiator azobisisobutyronitrile was added. After the reaction for 8 hours, the product was washed with isopropanol for several times after being removed by rotary evaporation, and the product was collected. The product lignin polycarboxylic acid can be obtained by drying in a vacuum oven at 50°C.

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Abstract

The invention belongs to the technical field of concrete high-efficiency water reducing agents, and discloses a polycarboxylate superplasticizer and a preparation method and application thereof in concrete. The polycarboxylate superplasticizer based on a lignin ester monomer is prepared from the following components in parts by mass through reversible addition fragmentation chain transfer reaction: 1-20 parts of unsaturated lignin ester monomer, 99-70 parts of unsaturated polyoxyethylene ether, 10-18 parts of unsaturated carboxylic acid, 0.5-5 parts of an initiator, and 0.1-2 parts of a chain transfer agent. The prepared lignin polycarboxylic acid has good dispersing performance, can effectively reduce the viscosity of cement paste, has good air entraining performance, and can introduce fine foams into concrete to enhance the thermal insulation performance of mortar.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency water-reducing agents in concrete, and particularly relates to a lignin-based polycarboxylate water-reducing agent and a preparation method and application thereof. Background technique [0002] With the increasing shortage of natural resources, my country has vigorously implemented energy-saving and emission-reduction policies, and has begun to gradually pay attention to energy consumption in buildings and actively promote green buildings. Generally, it is achieved by continuously improving the production process and improving the thermal insulation quality of building materials on the existing basis, so a large number of building thermal insulation materials have appeared. Polycarboxylate superplasticizer is currently the most commonly used admixture for building thermal insulation materials, with high water reduction rate, strong dispersion performance, better cement adaptability and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F299/00C08H7/00C04B24/26C04B103/30
CPCC08F283/065C08F299/00C08H6/00C04B24/2694C04B2103/302C08F220/06
Inventor 郑大锋钟定明李琼杨东杰姚日晖
Owner SOUTH CHINA UNIV OF TECH