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Polycarboxylic acid water reducing agent, preparation method and application thereof

A technology of polycarboxylic acid series and water reducing agent, applied in the field of polycarboxylic acid series water reducing agent, can solve the problems of unfavorable industrial production, complex process and high requirements, and achieve the effects of being beneficial to industrial production, simple process and low cost

Inactive Publication Date: 2013-02-20
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can obtain relatively ideal products, the process is complicated and the requirements are high, which is not conducive to industrial production.

Method used

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  • Polycarboxylic acid water reducing agent, preparation method and application thereof
  • Polycarboxylic acid water reducing agent, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 100 parts of isobutylene polyoxyethylene ether (weight average molecular weight 2400) into the reaction kettle, add 80 parts of water, heat up and stir to make it evenly dispersed in the aqueous solution, and use 1.4 parts of ammonium persulfate and 4 parts of sodium allyl sulfonate Dissolve 10 parts of water and add to the reaction kettle, stir evenly and raise the temperature to 35°C, keep the temperature fluctuation range within 2°C during the whole reaction process, start to add dropwise a solution composed of 0.35 parts of glucose dissolved in 30 parts of water, and start to drop after 20 minutes A solution composed of 7.5 parts of acrylic acid and 0.2 parts of thioglycolic acid dissolved in 25 parts of water. The former is controlled to be added dropwise within 3 hours, and the latter is added dropwise within 2 hours. When the pH is 6-7, the polycarboxylate superplasticizer product is obtained.

Embodiment 2

[0032] Take 100 parts of isobutylene polyoxyethylene ether (weight average molecular weight 2000) into the reaction kettle, add 80 parts of water, heat up and stir to make it evenly dispersed in the aqueous solution, mix 1.5 parts of sodium persulfate and 4.5 parts of methallylsulfonic acid Dissolve sodium with 10 parts of water and add it to the reaction kettle, stir evenly and heat up to 35°C, keep the temperature fluctuation range not exceeding 2°C during the whole reaction process, start to add dropwise a solution composed of 0.3 parts of vitamin C dissolved in 30 parts of water, after 20 minutes Start to add dropwise a solution of 8 parts of acrylic acid, 2 parts of maleic anhydride and 0.15 parts of mercaptoethanol dissolved in 25 parts of water. The former is controlled to be added in 3 hours, and the latter is added in 2 hours. After all the drops are completed, the reaction is kept for 1.5 hours. , adjust the pH to 6-7 with 40% sodium hydroxide solution to obtain the p...

Embodiment 3

[0034] Take 100 parts of isobutylene polyoxyethylene ether (weight average molecular weight 1200) into the reaction kettle, add 80 parts of water, heat up and stir to make it evenly dispersed in the aqueous solution, and use 1.7 parts of potassium persulfate and 4.5 parts of sodium vinyl sulfonate with 10 Parts of water are dissolved and added to the reaction kettle, stirred evenly and heated to 30°C, keeping the temperature fluctuation range not exceeding 2°C during the whole reaction process, starting to add dropwise a solution composed of 0.4 parts of glucose dissolved in 30 parts of water, and starting to drop after 20 minutes A solution composed of 9 parts of acrylic acid and 0.25 parts of 2-mercaptopropionic acid dissolved in 25 parts of water. The former is controlled to be added dropwise within 3 hours, and the latter is added dropwise within 2 hours. The sodium solution adjusts the pH to 6-7 to obtain the polycarboxylate superplasticizer product.

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Abstract

The invention relates to a polycarboxylic acid water reducing agent, a preparation method and an application thereof, and belongs to the technical field of concrete additives. The polycarboxylic acid water reducing agent is prepared by using industrializedly produced isobutenol polyether or isoamylenol polyether with relatively good performances as a monomer A, unsaturated carboxylic acid, unsaturated acid anhydride or unsaturated ester as a monomer B and unsaturated sulfonic acid and salts thereof as a monomer C, according to a water reducing agent functional group theory and a polycarboxylic acid water reducing agent molecule design theory; and co-polymerizing the monomer A, B and C. A polycarboxylic acid water reducing agent product is obtained in a water solution via a one-step method, under initiation of a redox initiation system, by introducing carboxyls or ester groups having the functions of delayed coagulation and slump resistance, and the sulfonic acid groups having high water reducing effect into the molecular structure of the water reducing agent and controlling a material ratio and material-feeding modes. Besides, cost can be further reduced by selecting a proper redox system to make the polymerization carried out at a low temperature. The method is suitable for industrialize production.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, its preparation method and application, and belongs to the technical field of concrete admixtures. Background technique [0002] Concrete is the largest and most widely used building material in the world. Since the 1930s, the emergence and successful application of water-reducing agents in the field of concrete, especially the emergence of high-efficiency and high-performance water-reducing agents, has greatly promoted the development of concrete technology, and has gradually become a part of concrete, especially modern concrete. Indispensable component. Although the dosage is small, it can greatly improve the construction process of concrete, improve the performance of concrete materials, reduce costs, etc., and is called "industrial monosodium glutamate" by the industry. After more than 70 years of development, the water reducer has been composed of the first generation of ordinary water re...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F290/06C08F4/40C04B103/30
Inventor 刘益军王万林章玲王高明郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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