Modified bio-based high-performance water reducing agent and preparation method thereof

A high-performance, bio-based technology, applied in the field of concrete admixtures, can solve the problems of high equipment requirements and energy consumption, low conversion utilization rate of grafting and copolymerization reactions, and difficulty in meeting low-carbon energy saving, etc. The effect of high-value utilization and efficient utilization

Pending Publication Date: 2021-10-19
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

[0004] However, in the existing preparation methods, there are generally high equipment requirements and energy consumption, high temperature and high pressure, strong alkali conditions are required, and it is difficult to meet the requirements of low-carbon energy saving and other environmental problems. At the same time, when grafting modification, there are The conversion utilization rate of grafting and copolymerization is not high, etc.

Method used

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  • Modified bio-based high-performance water reducing agent and preparation method thereof
  • Modified bio-based high-performance water reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A preparation method of a modified bio-based high-performance water reducer, the steps are as follows:

[0041] S1. Preparation of double bond-activated lignin derivatives:

[0042] S11. Weigh 250g of alkali lignin and 750g of deionized water in a container, raise the temperature to 50°C, continue to stir and dissolve, use an ultrafiltration membrane with a molecular weight cut-off of 2500 to separate, and then perform rotary evaporation and concentration to obtain a concentration of 40.5%. Purified alkali lignin solution. Weigh 250 g of the purified alkali lignin solution, add 3.2 g of acetic acid, and adjust the pH value of the filtrate to about 2 to prepare an acidic alkali lignin solution.

[0043] S12. Add 200 g of acidic alkali lignin solution and 1.5 g of hexamethylenetetramine into a reaction vessel with a reflux condensing device, keep stirring, control the reaction temperature at 75° C., and react for 6 hours to obtain alkylamino-modified Alkali lignin.

[00...

Embodiment 2

[0049] A preparation method of a modified bio-based high-performance water reducer, the steps are as follows:

[0050] S1. Preparation of double bond-activated lignin derivatives:

[0051] S11. Weigh 200g of sodium alkali lignin carboxylate and 800g of deionized water in a container, raise the temperature to 40°C, continue to stir and dissolve, use an ultrafiltration membrane with a molecular weight cut-off of 3000 to separate, and then perform rotary evaporation and concentration to obtain the concentration A 35.6% solution of purified alkali lignin sodium carboxylate. Weigh 500 g of purified alkali lignin sodium carboxylate solution, add 3.5 g of hydrochloric acid, adjust the pH value of the filtrate to about 1, and prepare an acidic alkali lignin sodium carboxylate solution.

[0052] S12. Add 300g of acidic alkali lignin sodium carboxylate solution and 1.0g of hexamethylenetetramine into a reaction vessel with a reflux condensing device, keep stirring, control the reaction...

Embodiment 3

[0058] A preparation method of a modified bio-based high-performance water reducer, the steps are as follows:

[0059] S1. Preparation of double bond-activated lignin derivatives:

[0060] S11. Weigh 300g of alkali lignin potassium carboxylate and 700g of deionized water in a container, raise the temperature to 50°C, continue to stir and dissolve, use an ultrafiltration membrane with a molecular weight cut-off of 3500 to separate, and then perform rotary evaporation and concentration to obtain the concentration A 50.3% solution of purified alkali lignin potassium carboxylate. Weigh 400 g of purified alkali lignin potassium carboxylate solution, add 1.8 g of sulfuric acid, and adjust the pH value of the filtrate to about 1 to prepare an acidic alkali lignin potassium carboxylate solution.

[0061] S12. Add 200g of acidic alkali lignin potassium carboxylate solution and 2.0g of hexamethylenetetramine into a reaction vessel with a reflux condensation device, keep stirring, contr...

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Abstract

The invention discloses a modified bio-based high-performance water reducing agent and a preparation method thereof. The modified bio-based high-performance water reducing agent comprises the following components in parts by weight: 85-95% of a double-bond-activated lignin derivative, 2-8% of reducing sugar, 1-6% of unsaturated carboxylic acid, 0.8-1.5% of an initiator oxidation component, 0.2-0.5% of an initiator reduction component, 0.5-1.0% of a backing material chain transfer agent, 0.2-0.8% of a material A chain transfer agent and a catalyst with the final concentration of 2.5-10 ppm. The prepared water reducing agent has a certain comb-shaped structure and a large number of carboxyl adsorption groups and has a good adsorption and dispersion effect on cement particles under the condition of a low mixing amount, and concrete mixed with the high-performance water reducing agent has excellent fluidity and fluidity maintaining performance. Meanwhile, the preparation method provided by the invention can reduce the dependence of high-performance water reducing agent production on petrochemical products, and realizes high-value utilization of biomass industrial byproducts.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a modified bio-based high-performance water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer (PCE) is the third generation of high-performance superplasticizer, which has outstanding advantages such as small dosage, high water reducing rate, designable molecular structure, and environmental friendliness. key technologies. It is suitable for concrete with different working performance requirements such as long-term retention (slump retention>2h), high fluidity (expansion degree>700mm) and low water-binder ratio (w / c<0.25), and is widely used in roads, Bridges, dams, tunnels, high-rise buildings and other projects. [0003] The quality of polyether in the production raw materials of polycarboxylate superplasticizer reaches more than 85%, which is the most important factor affecting the perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/06C04B24/26C08H7/00C04B103/30
CPCC08F289/00C04B24/2641C08H6/00C04B2103/302C08F220/06
Inventor 高育欣曾超刘明杨文王福涛张磊叶子闫松龄
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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