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High efficiency straw pulp sulfonated alkali lignin water-reducing agent and method for preparing same

A technology of sulfonated alkali lignin and high-efficiency water reducer, which is applied in the field of high-efficiency water reducer to achieve the effects of improving surface physical and chemical properties, saving cement, and having good water solubility

Inactive Publication Date: 2005-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fenton's reagent is a strong inorganic oxidizing agent. It has the advantages of simple operation process, easy access to reactants, low cost, no need for complicated equipment and environmental friendliness when used in oxidation reactions. It has been widely used in dyes, preservatives, and phase development. Toxic and refractory organics are treated in waste water treatment projects such as chemical reagents and pesticides, and there is no report on the application of Fenton reagent to the oxidation of alkali lignin

Method used

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  • High efficiency straw pulp sulfonated alkali lignin water-reducing agent and method for preparing same
  • High efficiency straw pulp sulfonated alkali lignin water-reducing agent and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, take 500g of acid-analyzed grass pulp alkali lignin, add 1000g of water, 2mL of concentrated H 2 SO 4 , adjust the pH value to 5, and heat to 70°C while stirring; then add 0.8g FeCl 2 And 50g hydrogen peroxide, carry out catalytic oxidation reaction for 0.5 hours; finally add 50g formaldehyde, 200g sodium sulfite, carry out sulfomethylation reaction and condensation reaction for 4 hours. After cooling, the liquid product of high-efficiency water reducer can be obtained, and then the powder product can be obtained after drying.

Embodiment 2

[0033] First, take 500g of acid-analyzed straw alkali lignin, add 1000g of water and 10g of NaOH, adjust the pH value to 8, and heat to 60°C while stirring; then add 0.8g of FeCl 2 And 50g of hydrogen peroxide, carry out catalytic oxidation reaction for 1 hour; finally add 50g of formaldehyde, 50g of terephthalenedimethanol, 200g of sodium sulfite, carry out sulfomethylation reaction and condensation reaction for 3 hours. After cooling, the concrete high-efficiency water reducer liquid product can be obtained, and then the powder product can be obtained after drying.

Embodiment 3

[0035] First, take 500g of acid-analyzed straw alkali lignin, add 1000g of water and 20g of NaOH, adjust the pH value to 10, and heat to 80°C while stirring; then add 1g of FeCl 2 , 1gCu(NO 3 ) 2 And 75g of hydrogen peroxide, carry out catalytic oxidation reaction for 0.5 hours; finally add 25g of formaldehyde, 150g of terephthalenedimethanol, 100g of sodium sulfite, 50g of sodium bisulfite, carry out sulfomethylation reaction and condensation reaction for 2 hours. After cooling, the concrete high-efficiency water reducer liquid product can be obtained, and then the powder product can be obtained after drying.

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Abstract

The present invention is the preparation process of high efficiency sulfonated straw pulp alkali lignin water reducing agent for concrete or mortar in building engineering. The preparation process includes adding 200 weight portions of water into 100 weight portions of straw pulp alkali lignin, regulating pH value to 3-10, heating to 40-100 deg.c, adding 5-15 weight portions hydrogen peroxide and 0.1-2 weight portions of transition metal salt, catalytically oxidizing for 0.5-1 hr, adding 5-50 weight portions of condensing agent and 5-50 weight portions of sulfite for sulfomethylation of 1-5 hr, and cooling the reaction product to room temperature to obtain the liquid product. The high efficiency sulfonated straw pulp alkali lignin water reducing agent has high water reducing rate, moderate delayed setting, high slump maintaining property, and high compatibility to cement and other water reducing agent.

Description

technical field [0001] The invention relates to a high-efficiency water reducer suitable for concrete or mortar in construction engineering and a preparation method thereof. Specifically, the by-product straw pulp alkali lignin recovered from alkaline pulping is used as raw material, and the high-efficiency water reducer for concrete is prepared through catalytic oxidation and high-efficiency sulfonation. The water reducing agent has the advantages of high water reducing rate, moderate retardation, good slump retention, adaptability to cement and good compatibility with other high-efficiency water reducing agents. Background technique [0002] With the rapid development of the construction industry, new requirements are constantly put forward for the performance of concrete in various aspects, such as improving the strength and wear resistance of concrete, improving the workability of fresh concrete, and reducing the slump loss during concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18
Inventor 邱学青庞煜霞杨东杰楼宏铭梁文学
Owner SOUTH CHINA UNIV OF TECH
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