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Sulfonated acetone-formaldehyde high-efficiency water reducing agent modified by enzymatic hydrolysis lignin or by derivatives thereof, and preparation method thereof

A technology of enzymatically decomposing lignin and high-efficiency water reducer, which is applied in the field of surfactant preparation, can solve the problems of difficulty in meeting the needs of modern construction, low sodium sulfate content, and difficult crystallization, etc., to reduce synthesis costs, reduce consumption, and manufacture low cost effect

Inactive Publication Date: 2009-09-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lignosulfonate is a commonly used common water reducer, but it is difficult to meet the needs of modern construction
Sulfonated acetone-formaldehyde condensate (SAF) is a high-efficiency aliphatic hydroxysulfonate superplasticizer. It has simple and easy-to-obtain raw materials, high water-reducing rate, good adaptability to cement varieties, low sodium sulfate content, and winter Not easy to crystallize, non-air-entraining, no chlorine salt, no corrosion to steel bars, etc.; but the price is higher than that of naphthalene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of enzymatic lignin-sulfonated acetone-formaldehyde superplasticizer

[0048] Add 225 grams of water, 19 grams of sodium sulfite and 29 grams of sodium metabisulfite into the reaction flask, heat to 45°C, stir to dissolve them, then add 60 grams of acetone, 10 grams of enzymatic lignin and 45 grams of formaldehyde, and heat to 60°C for reaction After 30 minutes, add 1.5ml of 40% sodium hydroxide solution by weight to adjust the pH value of the solution to 14, continue sulfonation for 1 hour, and add 134 grams of formaldehyde dropwise within half an hour. After the dropwise addition, the reaction temperature is gradually increased Heat to 95°C, keep it for 3 hours, stop heating, cool in a water bath, stop stirring when the temperature drops to 30°C, then add 1.8ml of sulfuric acid with a weight concentration of 40% to pH 8-9, cool to room temperature to obtain dark red enzyme Lignin-sulfonated acetone-formaldehyde superplasticizer liquid.

[0049] There are ...

Embodiment 2

[0051] Enzymatic hydrolysis of lignophenol derivatives-sulfonated acetone-formaldehyde superplasticizer

[0052] Take 50g of enzymatic lignin and add 200g of p-cresol, stir rapidly at room temperature for 60min to completely dissolve the enzymatic lignin, then add 200g of sulfuric acid with a weight concentration of 72%, and after stirring for 60min, transfer the reaction solution into a separatory funnel, The layers were separated and the organic phase was separated. The organic layer was dropped into excess diethyl ether drop by drop, while stirring rapidly with a magnetic stirrer, and centrifuged, the precipitate was collected and washed with distilled water until neutral, then dissolved with acetone, and the insoluble matter was removed by centrifugation. After the acetone solution was concentrated, it was dropped into excess ether, and the precipitate was collected, washed repeatedly with ether, and dried to obtain 65 g of enzymatically hydrolyzed lignophenol.

[0053] T...

Embodiment 3

[0055] Preparation of acrylamide-grafted enzymatically decomposed lignin-sulfonated acetone-formaldehyde superplasticizer

[0056] 100 ml of 2% NaOH solution was charged into a four-neck flask, 25.0 g of enzymatic lignin was added, and stirred. 50.0g acrylamide monomer and 0.8g K 2 S 2 0 8 The initiator was dissolved in 850ml of distilled water, and was slowly added dropwise to the four-necked flask with a dropping funnel, and the N 2 Protected, reacted at a temperature of 50°C for 3 hours, poured out the reaction product, added 10% hydrochloric acid to adjust the pH to about 3, centrifuged, washed the precipitate with distilled water for 3 times, dried, and weighed to obtain 10.2g Enzymatic hydrolysis of lignin by acrylamide.

[0057] Add 230g of water, 18g of sodium sulfite and 31g of sodium metabisulfite into the reaction flask, heat to 45°C, stir to dissolve them, then add 60g of acetone, 10g of enzymatic lignin grafted with acrylamide and 45g of formaldehyde, and heat...

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Abstract

The invention provides a sulfonated acetone-formaldehyde high-efficiency water reducing agent modified by enzymatic hydrolysis lignin or by derivatives thereof, and a preparation method thereof, raw materials comprise the enzymatic hydrolysis lignin or the derivatives thereof, acetone, aldehyde, sodium sulfite and sodium metabisulfite, a base catalyst and an acid regulator; the preparation steps comprise: mixing the sodium sulfite, the sodium metabisulfite with the water, heating at constant temperature and agitating, dropwise adding the acetone, adding the enzymatic hydrolysis lignin or the derivatives thereof, regulating pH value by the base catalyst, dropwise adding the aldehyde, continuous reacting for 3 hours, and adding the acid regulator to regulate the pH so as to result in product. The invention sufficiently utilizes reproducible biological resources, which not only solves the defect of low water reducing efficiency of the lignin-sulphonate water reducing agent extracted from papermaking 'black liquor' in the prior art, but also can replace partial petrochemical raw materials and reduce the production cost of the high-efficiency water reducing agent; the enzymatic hydrolysis lignin- or the derivatives thereof-modified high-efficiency water reducing agent has great use effect.

Description

technical field [0001] The invention belongs to the field of surfactant preparation, and more specifically relates to a sulfonated acetone-formaldehyde high-efficiency water reducer modified by enzymatically decomposing lignin or its derivatives and a preparation method thereof. Background technique [0002] With the development of high-performance, high-fluidity concrete and commercial concrete, people pay more and more attention to the synthesis and modification of concrete water reducers. Lignosulfonate is a commonly used common water reducer, but it is difficult to meet the needs of modern construction. Sulfonated acetone-formaldehyde condensate (SAF) is a high-efficiency aliphatic hydroxysulfonate superplasticizer. It has simple and easy-to-obtain raw materials, high water-reducing rate, good adaptability to cement varieties, low sodium sulfate content, and winter Not easy to crystallize, non-air-entraining, no chlorine salt, no corrosion to steel bars, etc.; but the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/30C04B24/18C04B103/30
CPCC04B2103/302C04B24/22
Inventor 程贤甦靳艳巧
Owner FUZHOU UNIV
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