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Synthesis method of high-slump-retaining polycarboxylate superplasticizer

A synthesis method and technology of water reducing agent, applied in the field of concrete admixtures, can solve the problems of unstable performance and quality of concrete, long setting time and high water reduction rate, and achieve the effects of shortening construction period, long slump retention time and cost saving.

Inactive Publication Date: 2014-08-27
北京市新世纪东方建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some operational or technical difficulties in any kind of solution, which will cause the instability of concrete performance and quality. For example, some have high water-reducing rate, but the collapse is fast; some have good collapse-preserving effect, but the setting time is long, etc insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] A kind of synthesis method of high slump retention type polycarboxylate water reducer described in the embodiment of the present invention, the synthesis method comprises the following steps:

[0021] ① Add 50-60 parts by weight of water, 30-35 parts of methallyl polyoxyethylene ether and 3-5 parts of acrylic acid into the flask, stir and heat to 60-68 °C;

[0022] ② Add initiator to the flask in step ①, and stir for 8 to 15 minutes;

[0023] ③Put material A and material B into hanging bottles respectively, and add them dropwise to the flask in step ②, the material A is a mixture of persulfate and water, and the material B is a mixture of high acid and water ;

[0024] ④ After adding material A mentioned in step ③, keep it warm for 1-2.5 hours, lower the temperature and then add alkali solution to neutralize the pH value to 6-7, which is the high-slump polycarboxylate superplasticizer described above.

[0025] As further preferably, the flask described in step ① is pr...

Embodiment 1

[0036] A kind of synthetic method of high slump retention type polycarboxylate water-reducer comprises the following steps: 1. adding weight fraction is the water of 50kg, the methallyl polyoxyethylene ether of 35kg and the acrylic acid of 4kg in the flask, stirs and heats to 60°C; ② Add initiator to the flask in step ①, and stir for 12 minutes; ③ Put material A and material B into the dropping device, and add it dropwise to the flask in step ②, add 3.5 hour, B material was added dropwise for 3.0 hours, and described A material was a mixture of ammonium persulfate and water, and described B material was a mixture of perchloric acid and water; , and lower the temperature by 40°C, add sodium hydroxide aqueous solution to make the pH value 6-7, which is the high slump retention polycarboxylate water reducer.

Embodiment 2

[0038] A kind of synthetic method of high slump retention type polycarboxylate water-reducer comprises the following steps: 1. adding weight fraction in the flask is the water of 60kg, the methallyl polyoxyethylene ether of 33kg and the acrylic acid of 5kg, stirs and heats to 65°C; ②Add the initiator to the flask in step ①, and stir for 9 minutes; ③Put material A and material B into hanging bottles, and add them dropwise to the flask in step ②, and add material A dropwise for 3.5 hours , B material is added dropwise for 3.0 hours, and described A material is the mixture of sodium persulfate and water, and described B material is the mixture of permanganic acid and water; And after reducing the temperature by 40°C, add sodium bicarbonate aqueous solution to make the pH value 6-7, which is the high slump retention type polycarboxylate water reducer.

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Abstract

The invention relates to a synthesis method of a high-slump-retaining polycarboxylate superplasticizer. The synthesis method comprises the following steps of (1) adding water, methyl allyl polyethenoxy ether, and acrylic acid into a flask, stirring and heating; (2) adding an initiator into the flask in the step (1), and stirring; (3) respectively filling a material A and a material B into an infusion bottle, and dropwise adding the material A and the material B into the flask in the step (2), wherein the material A is a mixture of persulfate and water, and the material B is a mixture of peracid and water; and (4) after the material A in the step (3) is dropwise added, keeping the temperature for 1-2.5h, reducing the temperature, and then, adding an alkaline solution to regulate the pH value to 6-7 to obtain the high-slump-retaining polycarboxylate superplasticizer. The high-slump-retaining polycarboxylate superplasticizer synthesized by using the method is capable of overcoming defects of long construction pumping distance, long coagulation time and poor physical property of concrete and reducing the construction cost and convenience in construction.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a synthesis method of a high slump retention polycarboxylate water reducer. Background technique [0002] In the application process of commercial concrete, one of the most common and main problems is the loss of concrete slump, especially for pumped concrete. This problem is more prominent in high temperature and hot weather conditions. For a long time, many experts and scholars at home and abroad have conducted research on concrete slump loss. At present, the industry mainly solves the problem of concrete slump damage through methods such as post-mixing of water reducing agents, combined use with retarders, and lowering the concrete exit temperature. However, there are some operational or technical difficulties in any kind of solution, which will cause the instability of concrete performance and quality. For example, some have high water-reducing rate, but the slump loss is fast; insuf...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F228/02C04B24/16C04B103/30
Inventor 王永康
Owner 北京市新世纪东方建筑材料有限公司