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Modified polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of modified polycarboxylic acid water reducing agent and its preparation, can solve the problems of insignificant effect, cumbersome process, restricting development, etc. Simple process and the effect of reducing production costs

Active Publication Date: 2015-03-25
ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] my country ranks first in the world in the production and consumption of paper and cardboard. The pulp and paper industry emits a large amount of waste every year. The waste contains a large amount of lignosulfonate. Water-reducing agent, but its development is restricted due to its low water-reducing rate, strong retarding property, and high air-entraining property. Physical mixing, but the effect of this method is not obvious, and the process is cumbersome
[0004] Chinese patent (CN102358768A) discloses a modified ether polycarboxylate water reducer and its preparation method, using unsaturated polyether, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid as raw materials, initiating Synthesized water reducing agent under the participation of agent and chain transfer agent, in this method monomer 2-acrylamido-2-methyl propane sulfonic acid is expensive, has increased production cost

Method used

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  • Modified polycarboxylate superplasticizer and preparation method thereof

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Effect test

Embodiment 1

[0030] A modified polycarboxylate water reducer is produced by radical polymerization of the following raw materials in parts by weight:

[0031] Bottom liquid: methallyl polyoxyethylene ether: 300, modified calcium lignosulfonate: 31, sodium methacryl sulfonate: 5, deionized water: 70;

[0032] Solution A: acrylic acid: 35, deionized water: 135;

[0033] Solution B: ammonium persulfate: 2.5, deionized water: 210.

[0034] The preparation method of the modified polycarboxylate water reducer comprises the following steps: when the temperature of the bottom liquid is 80°C, drop solution A into the bottom liquid for 1 hour, and simultaneously add solution B dropwise into the bottom liquid , the dropping time was 1.5 hours; after the dropping was completed, the insulation reaction was carried out for 30 minutes, and then 32% mass concentration of sodium hydroxide aqueous solution was added to adjust the pH value to 6.5, and the temperature was stirred for 20 minutes to obtain the...

Embodiment 2

[0036] A modified polycarboxylate water reducer is produced by radical polymerization of the following raw materials in parts by weight:

[0037] Bottom liquid: methallyl polyoxyethylene ether: 325, modified calcium lignosulfonate: 46, sodium methacrylate: 7, deionized water: 310;

[0038] Solution A: acrylic acid: 41, deionized water: 144;

[0039] Solution B: ammonium persulfate: 3.2, deionized water: 230;

[0040] The preparation method of the modified polycarboxylate water reducer comprises the following steps: when the temperature of the bottom liquid is 85°C, drop solution A into the bottom liquid for 1 hour, and simultaneously add solution B dropwise into the bottom liquid , the dropping time is 1.5 hours; after the dropping is completed, keep the temperature for 30 minutes, then add 32% mass concentration of sodium hydroxide aqueous solution to adjust the pH value to 6.8, and keep stirring for 20 minutes to obtain the modified polycarboxylate water-reduced agent.

Embodiment 3

[0042] A modified polycarboxylate water reducer is produced by radical polymerization of the following raw materials in parts by weight:

[0043] Bottom liquid: methallyl polyoxyethylene ether: 340, modified calcium lignosulfonate: 50, sodium methacryl sulfonate: 9, deionized water: 380;

[0044] Solution A: acrylic acid: 46, deionized water: 160;

[0045] Solution B: ammonium persulfate: 3.9, deionized water: 260.

[0046] The preparation method of the modified polycarboxylate water reducer comprises the following steps: when the temperature of the bottom liquid is 90°C, drop solution A into the bottom liquid for 1 hour, and simultaneously add solution B dropwise into the bottom liquid , the dropping time was 1.5 hours; after the dropping was completed, the insulation reaction was carried out for 30 minutes, and then 32% mass concentration of sodium hydroxide aqueous solution was added to adjust the pH value to 6.1, and the temperature was stirred for 20 minutes to obtain th...

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Abstract

The invention relates to the technical field of construction material additives, in particular to a modified polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: conducting condensation reaction on calcium lignosulphonate and acrylic acid to prepare modified calcium lignosulphonate; utilizing monomer methyl allyl polyoxyethylene ether, the modified calcium lignosulphonate and acrylic acid to prepare the modified polycarboxylate superplasticizer through free radical copolymerization synthesis under the action of chain transfer agent sodium methallyl sulfonate and initiator ammonium persulfate. According to the invention, the sulfonic acid group in the introduced calcium lignosulphonate has high dispersity; water-reducing rate is improved; manufacturing cost is reduced; the polycarboxylate superplasticizer is environment-friendly and economic; the preparation technology is simple; the synthesized modified polycarboxylate superplasticizer is high in water-reducing rate, fluidity and slump maintaining capability.

Description

technical field [0001] The invention relates to the technical field of building material admixtures, in particular to a modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the development of the construction industry, the requirements for water reducing agents in engineering applications are gradually increasing. The polycarboxylate water reducer developed in recent years is recognized at home and abroad as the third generation after the first generation of water reducer represented by wood calcium and the second generation of water reducer represented by naphthalene. High performance water reducer. Polycarboxylate superplasticizer has been greatly promoted and applied because of its high water reducing rate and good adaptability. [0003] my country ranks first in the world in the production and consumption of paper and cardboard. The pulp and paper industry emits a large amount of waste every year. The waste contain...

Claims

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Application Information

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IPC IPC(8): C08F291/14C08F220/06C08F2/38C08H7/00C04B24/18C04B103/30
Inventor 王浩雨马丽涛刘记伟陈琳
Owner ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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