A modified lignosulfonate water reducer and its preparation method

A technology of lignosulfonate and potassium lignosulfonate, applied in the field of concrete admixtures, can solve problems such as difficulties in large-scale industrial production and popularization and application, disconnection between modification research and application research, and large performance fluctuation of modified products. , to achieve the effect of pollution-free and clean production process, slump maintenance and good slump

Active Publication Date: 2017-08-29
FUJIAN QINGYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lignosulfonate can be directly used as a common water reducing agent for concrete, but it has defects such as low water reducing rate, excessive retardation, uneven bubbles, etc.
[0003] Scholars at home and abroad have done a lot of research on the preparation of high-efficiency water reducers by modifying lignosulfonate in the late 1970s. The modification methods can usually be divided into physical modification and chemical modification, and the cost of physical modification is high. , the improvement of water reducing performance is not obvious, chemical modification can change the molecular structure of lignosulfonate from the perspective of molecular design, improve the surface activity of lignosulfonate, it has the advantages of many modification means and great controllability, but Often modification research and application research are disconnected, resulting in high modification costs, large fluctuations in performance of modified products, and difficulties in large-scale industrial production and popularization and application

Method used

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  • A modified lignosulfonate water reducer and its preparation method
  • A modified lignosulfonate water reducer and its preparation method
  • A modified lignosulfonate water reducer and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The content of each component required for the reaction is as shown in Table 1, wherein the lignosulfonate is sodium lignosulfonate, and the unsaturated carboxylic acid and / or unsaturated carboxylic acid salt are acrylic acid, vinyl phosphoric acid and / or The vinyl phosphate is vinyl phosphoric acid, the oxidizing agent is hydrogen peroxide, and the initiator is sodium persulfate.

[0027] A preparation method of a modified lignosulfonate water reducer is realized through the following steps:

[0028] It is achieved through the following steps:

[0029] (1) After adding sodium lignosulfonate and water into the reactor, start stirring, and start to heat up;

[0030] (2) When the temperature rises to 55°C, add hydrogen peroxide, continue the reaction for 2 hours, add acrylic acid, allyl glucose, and vinyl phosphoric acid, and heat up after the addition is complete;

[0031] (3) When the temperature rises to 70°C, start to add dropwise a sodium persulfate solution with a...

Embodiment 2

[0034] The content of each component required for the reaction is as shown in Table 1, wherein the lignosulfonate is magnesium lignosulfonate, and the unsaturated carboxylic acid and / or unsaturated carboxylic acid salt are acrylic acid, vinyl phosphoric acid and / or The vinyl phosphate is sodium vinyl phosphate, the oxidizing agent is sodium ferrate, and the initiator is potassium persulfate.

[0035] A preparation method of a modified lignosulfonate water reducer is realized through the following steps:

[0036] (1) After adding magnesium lignosulfonate and water into the reactor, start stirring, and start to heat up;

[0037] (2) When the temperature rises to 60°C, add sodium ferrate, continue the reaction for 1.5 hours, add acrylic acid, allyl glucose, and sodium vinyl phosphate, and heat up after the addition is complete;

[0038] (3) When the temperature rises to 85° C., start dripping the potassium persulfate solution whose mass percentage concentration is 1%; the droppi...

Embodiment 3

[0041] The content of each component required for the reaction is as shown in Table 1, wherein the lignosulfonate is a mixture of sodium lignosulfonate and potassium lignosulfonate, and the content of sodium lignosulfonate and potassium lignosulfonate The mass ratio is 1:1, the unsaturated carboxylic acid and / or unsaturated carboxylic acid salt is methacrylic acid, vinyl phosphoric acid and / or vinyl phosphate is potassium vinyl phosphate, the oxidizing agent is potassium permanganate, and the initiator is sodium persulfate.

[0042] A preparation method of a modified lignosulfonate water reducer is realized through the following steps:

[0043] (1) After adding sodium lignosulfonate, potassium lignosulfonate and water into the reaction kettle, start stirring, and start to heat up;

[0044] (2) When the temperature rises to 68°C, add potassium permanganate, continue the reaction for 1.8 hours, then add methacrylic acid, allyl glucose, and potassium vinyl phosphate, and heat up...

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PUM

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Abstract

The invention discloses a modified lignosulfonate water-reducing agent and a preparation method thereof. Firstly, lignosulfonate is oxidized by an oxidizing agent so as to improve the chemical activity of the lignosulfonate, and then the modified lignosulfonate is polymerized with unsaturated carboxylic acid and salts thereof, allyl glucose, and vinyl phosphonic acid and salts thereof to achieve a purpose of chemical modification, so that the modified sodium lignosulfonate is connected to a carboxyl group, a glycosyl group, a phosphonic group and other anionic groups for further improving the performance of a product. The modified lignosulfonate water-reducing agent is mainly used for improving the performance of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a modified lignosulfonate water reducer and a preparation method thereof. Background technique [0002] Lignin, also known as lignin, is the only non-petroleum resource in nature that can provide renewable aryl compounds. Lignin widely exists in the xylem of most terrestrial plants, accounting for about one-third of the biomass of terrestrial plants, and is the second largest natural organic matter with an annual output of about 60 billion tons. Through sulfonation, lignin undergoes chain scission and condensation reactions to generate a non-polar aromatic group, such as alkylbenzene, and polar sulfonic acid group, methoxyl group and hydroxyl group, which is an anionic high Molecular surfactant, that is, lignosulfonate. Lignosulfonate can be directly used as a common water reducer for concrete, but it has defects such as low water reducing rate, excessive retardatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/06C08F230/02C08F224/00C08H7/00C04B24/18C04B103/30
Inventor 刘剑锋郑福尔陈珍喜郑文国刘明华苏千德
Owner FUJIAN QINGYUAN TECH
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