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Preparation method of zymolytic lignin modified water reducing agent

A technology of enzymatically decomposing lignin and water reducing agent, applied in the field of preparation and new material development, can solve the problems of unsatisfactory water reducing effect, high price, resource depletion, etc., and achieve environmental protection, low manufacturing cost, expansion The effect of application range

Active Publication Date: 2012-05-30
重庆辉泰化工销售有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the lignin superplasticizer is used alone, the water reducing effect is not ideal. When the recommended dosage of lignosulfonate superplasticizer is 0.2% to 0.3%, its water reducing rate in concrete is 8% to 12%. , lower than naphthalene-based water-reducer (≥14%) and polycarboxylate-based water-reducer (≥25%), subject to certain restrictions in engineering applications
However, naphthalene-based water-reducers and polycarboxylate-based water-reducers are both products of petrochemical and coal chemical industries, and their resources are gradually exhausted and expensive.

Method used

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  • Preparation method of zymolytic lignin modified water reducing agent
  • Preparation method of zymolytic lignin modified water reducing agent
  • Preparation method of zymolytic lignin modified water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1. Enzymatic hydrolysis of lignin derivatives catalyzed by solid acid

[0044] 50gZrOCl 2 ·8H 2 O was dissolved in distilled water to make a solution with a mass fraction of 8%, and 55 ml of concentrated ammonia water was slowly added dropwise to the solution under stirring to adjust the pH to 9.0 to form a gel. Suction filtration after sedimentation at room temperature for 24 hours, repeated washing until no Cl - (0.1 mol / L silver nitrate solution test). Dry the solid in an oven at 105°C for 24 hours, grind it into a fine powder, pass through a 100-mesh sieve, and divide the obtained 28.6 g powder into two parts, one part is impregnated with 214ml 0.5 mol / L dilute sulfuric acid, and the other part is impregnated with 214ml Immerse in 1mol / L sodium nitrate solution, filter with suction without washing. The resulting filter cake was dried at 105 °C for 24 hours to obtain ZrO 2 / SO 4 2- and Na 2 O / ZrO 2 The initial sample was finally calcined at 680 °C f...

Embodiment 2

[0046] Example 2. Enzymolysis of lignin derivatives catalyzed by solid acid and solid base

[0047] Add 10 g of enzymatic lignin, 100 ml of water and 3 g of sodium hydroxide into a three-necked flask equipped with a heating and stirring device at 65 ° C, stir for 25 min, dissolve evenly, add 3 g of sodium sulfite, and then add 3 g of the product prepared in Example 1 Solid acid catalyst, when the temperature is raised to 90°C, the reaction is carried out for 4.0h. After the sample is cooled to room temperature, the solid acid catalyst is filtered and separated to obtain a solid acid-catalyzed enzymatic lignin derivative solution with a solid content of 20.1%, and then 10 g of 37% formaldehyde, heat up to 70°C for 2.0h, then add 3 g of sodium sulfite and 4g of the solid base catalyst prepared in Example 1, when the temperature rises to 90°C, the reaction proceeds for 3.0h, and the sample is cooled to room temperature and then filtered to separate the solid base Catalyst, obtain...

Embodiment 3

[0049] Add 10 g of enzymatic lignin, 100 ml of water and 3 g of sodium hydroxide into a three-neck flask with a heating and stirring device at 65 ° C, stir for 25 min, dissolve evenly, add 3 g of sodium sulfite, and then add the solid recovered in Example 1 Acid catalyst 3g, when the temperature is raised to 90°C, the reaction is carried out for 4.0h, the sample is cooled to room temperature and then filtered to separate the solid acid catalyst to obtain a solution of sulfonated lignin modified derivatives with a solid content of 20.0%, which is distilled under reduced pressure and dried. 12.7 g of solid acid-catalyzed enzymatically hydrolyzed lignin derivatives (SEHL) powder were obtained.

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Abstract

The invention provides a preparation method of zymolytic lignin modified water reducing agent. In the method, zymolytic lignin is used as raw material; solid acid and solid alkali generate catalytic and sulfonation reactions to prepare a cement water reducing agent. By using the advantages of strong chemical activity, high purity and the like of the zymolytic lignin and using a zymolytic lignin derivative sulfonated by the solid acid and the solid alkali as the cement water reducing agent, the performance of the zymolytic lignin modified water reducing agent is obviously superior to that of lignin sulfonate of a traditional byproduct of paper making industry. Used catalysts of the solid acid and the solid alkali can be repeatedly used; renewable resources can be thoroughly used; the consumption of petrochemicals is reduced; the cost of the preparation method is low so that great social and economic benefits are generated; and the process of preparing the cement water reducing agent has the advantages of simplicity, easy implementation and good effect.

Description

technical field [0001] The invention belongs to the field of new material development and preparation, and more specifically relates to a method of using enzymatically hydrolyzed lignin as a modified raw material [0002] A method for preparing a cement water reducer. Background technique [0003] As early as 1935, the United States began to use lignosulfonate extracted from papermaking waste liquid as concrete water reducer. Later, many countries also carried out research and vigorously promoted the use. my country began to produce such products in the 1970s. Lignosulfonate water reducers are mostly common types, but because of their wide range of sources and low cost, they have now become an important class of concrete additives. At present, domestic lignosulfonate superplasticizers are mainly used in two fields: 1) used alone as a water reducer to prepare concrete; 2) used in various early strength agents, early strength water reducers, retarded water reducers The prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/18C04B103/30
CPCC04B24/18
Inventor 程贤甦
Owner 重庆辉泰化工销售有限公司
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