Preparation method of polycarboxylate superplasticizer

A high-efficiency water reducer and polycarboxylate technology, applied in the field of new materials, can solve problems such as retention and backward technology, and achieve the effects of reducing time loss, high product quality, and wide application prospects

Inactive Publication Date: 2016-08-24
江苏创基新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country began to develop and use naphthalene-based and melamine-based high-efficiency concrete water reducers in the 1970s. In the 1980s, three types of high-efficiency water-reducers, namely naphthalene-based, polycyclic aromatic hydrocarbons and melamine, were successfully developed and put into use in China. Now more and more domestic universities and scientific research institutions have also turned their attention to the new polycarboxylate superplasticizer, but at present, the domestic research on polycarboxylate superplasticizer is still at the stage of exploration and imitation. stage, most scientific research units are still in the stage of laboratory synthesis, and the overall technology is relatively backward

Method used

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  • Preparation method of polycarboxylate superplasticizer
  • Preparation method of polycarboxylate superplasticizer
  • Preparation method of polycarboxylate superplasticizer

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Esterify 300mg of acrylic acid and 200mg of polyoxyethylene ether (polymerization degree n=25) containing terminal hydroxyl groups, heat the reaction at 110°C for 2 hours, heat up to 150°C for 2 hours, and distill under reduced pressure for 1 hour to reach the system There are no bubbles in the medium, and the macromonomer polyoxyethylene acrylate containing both double bonds and polyoxyethylene ether long chains can be obtained;

[0025] Sodium propylene sulfonate, the above-mentioned macromer polyoxyethylene acrylate, ammonium persulfate and deionized water were uniformly mixed according to the weight ratio of 30:10:0.5:55, and the temperature was raised to 70°C under nitrogen protection, and 30 For acrylic acid monomer in parts by weight, the titration rate is controlled at 3 drops / second. After the dropwise addition, continue to react for 3 hours, raise the temperature to 80°C, and continue to reflux for 2 hours. After the reaction is completed, vacuumize for 1 hour ...

Embodiment 2

[0027] Same as Example 1, but the degree of polymerization n of polyoxyethylene ether containing terminal hydroxyl groups in step (1) is 20, and other conditions remain unchanged.

Embodiment 3

[0029] Same as Example 1, but the degree of polymerization n of polyoxyethylene ether containing terminal hydroxyl groups in step (1) is 15, and other conditions remain unchanged.

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Abstract

The invention relates to the technical field of a novel material, and particularly relates to a method for preparing a polycarboxylate high-efficiency water reducing agent. The method comprises the following steps: firstly, reacting a hydroxyl-terminated polyoxyethylene ether witj acrylic acid, preparing an acrylic acid polyoxyethylene ester macromonomer containing double bonds and a polyoxyethylene ether; taking the acrylic acid, acrylic acid sodium sulfonate and an acrylic acid polyoxyethylene ester macromonomer as comonomers; carrying out copolymerization by adopting water solution free radical, so as to prepare the polycarboxylate high-efficiency water reducing agent containing carboxyl and a sulfonic acid group on a main chain and polyoxyethylene ether on a side chain. The polycarboxylate water reducing agent prepared by the method has a good water reducing effect on cement particles under the same condition; and compared with a naphthalene water reducer, the polycarboxylate high-efficiency water reducing agent has high water-reducing rate (being greater than 35%), and the concrete slump loss with time duration (being less than 8%) can be obviously reduced.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a polycarboxylate superplasticizer and a preparation method thereof. Background technique [0002] High-efficiency concrete water reducing agent can greatly reduce the unit water consumption and significantly improve the strength of concrete without changing the workability of concrete, or can significantly improve workability and combine the same without changing the unit water consumption. Water reducer with air-entraining effect. [0003] There are many classification methods of high-efficiency superplasticizers, which can be divided into air-entraining type, early-strength type, retarding type, plastic-retaining type, etc. according to functions; according to different production materials, they can be divided into: naphthalene-based water-reducing agent, melamine-based water-reducing agent agent, PAH-based water reducer, polycarboxylate water reducer, etc. At present...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08F290/06C08F220/06C08F228/02C08G65/48C04B24/16C04B103/30
Inventor周安安
Owner江苏创基新材料有限公司