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A kind of lignin-based polycarboxylate water reducer and its preparation method and application

A technology of lignin and polycarboxylic acid, applied in the field of high-efficiency water-reducing agent, can solve the problems of difficulty in construction and pumping, failure to achieve thermal insulation effect, high viscosity of concrete, etc., and achieve no delamination, good thermal insulation effect, Good workability of cement

Active Publication Date: 2022-03-29
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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  • A kind of lignin-based polycarboxylate water reducer and its preparation method and application
  • A kind of lignin-based polycarboxylate water reducer and its preparation method and application
  • A kind of lignin-based polycarboxylate water reducer and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

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

[0038] Dissolve 98g TPEG-2400 in 300ml dimethylformamide, pass through 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 Stir the reaction for 4 hours, finally add 2 g of unsaturated lignin ester monomer, add 0.02 g of initiator azobisisobutyronitrile, react for 8 hours, and wash with isopropanol several times after rotary evaporation to remove the solvent, collect the product, and store in The product lignin polycarboxylic acid can be obtained by drying in a vacuum oven at 50°C.

Embodiment 2

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

[0040] Dissolve 95g TPEG-2400 in 300ml dimethylformamide, pass through 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 Stir the reaction for 4 hours, and finally add 5 g of unsaturated lignin ester monomer, and supplement 0.05 g of initiator azobisisobutyronitrile. After reacting for 8 hours, wash with isopropanol several times after rotary evaporation to remove the solvent, and collect the product. The product lignin polycarboxylic acid can be obtained by drying in a vacuum oven at 50°C.

Embodiment 3

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

[0042] Dissolve 90g of TPEG-2400 in 300ml of dimethylformamide, pass through 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 Stir the reaction for 4 hours, and finally add 10 g of unsaturated lignin ester monomer, and add 0.1 g of initiator azobisisobutyronitrile. After reacting for 8 hours, wash with isopropanol several times after rotary evaporation to remove the solvent, and collect the product. 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 high-efficiency water reducers for concrete, and discloses a lignin polycarboxylate water reducer, a preparation method thereof and an application in concrete. The polycarboxylate water reducer based on lignin ester monomer of the present invention is obtained by reversible addition-fragmentation chain transfer reaction of the following components by mass: 1 to 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 initiator; 0.1-2 parts of chain transfer agent. The prepared lignin polycarboxylic acid has good dispersibility, can effectively reduce the viscosity of cement slurry, and has good air-entraining property, and can introduce fine bubbles 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 reducers in concrete, in particular to a lignin-based polycarboxylate water reducer and its preparation method and application. Background technique [0002] With the increasing shortage of natural resources, my country vigorously promotes energy conservation and emission reduction policies, and gradually pays attention to energy consumption in buildings and actively promotes green buildings. It is generally achieved by continuously improving the production process and improving the insulation quality of building materials on the existing basis, so a large number of building insulation materials have emerged. Polycarboxylate superplasticizer is currently the most commonly used admixture for building insulation materials, with high water reducing rate, strong dispersion performance, better cement adaptability and other excellent properties. Therefore, in the past decade, polycarboxyl...

Claims

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Application Information

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Patent Type & Authority Patents(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