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Polycarboxylic acid concrete plasticizer and synthesis thereof

A plasticizer and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of complex preparation process and difficult control of operation, and achieve the effects of simple production process, stable quality and good compatibility

Active Publication Date: 2010-07-14
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this type of copolymer is complicated and the operation is difficult to control

Method used

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  • Polycarboxylic acid concrete plasticizer and synthesis thereof
  • Polycarboxylic acid concrete plasticizer and synthesis thereof
  • Polycarboxylic acid concrete plasticizer and synthesis thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the monoesterification of polyene polyamine-based polyethylene glycol with the following structure is selected as monomer A:

[0034]

[0035] In a four-necked flask equipped with a thermometer and a stirrer, add 175g of monoester (molecular weight 2965) and 40g of water of polyene polyamine-based polyethylene glycol with the structure shown above, heat up to melting, add 5g (35% ) hydrogen peroxide, dropwise 15% sodium sulfite (1.4g) and sodium methacrylate (25g) aqueous solution 169.3g, 60% maleic anhydride aqueous solution 83.3g simultaneously. Wherein the sodium sulfite solution was dropped in 2.5 hours, and the maleic anhydride aqueous solution was dropped in 1.5 hours. During the reaction process, the temperature was controlled at 30°C, and after the dropwise addition was completed, the temperature was kept for 30 minutes. Adjust the pH value to 7 with 30% sodium hydroxide to obtain a polycarboxylate plasticizer with a weight average molecu...

Embodiment 2

[0037] In a four-necked flask equipped with a thermometer and a stirrer, add 175g of monoester and 61g of water with the polyene polyamine-based polyethylene glycol of Example 1, heat up to melting, add 5.3g (35%) hydrogen peroxide, Simultaneously, 111.6 g of 15% sodium sulfite (1.75 g) and sodium methacrylate (15 g) aqueous solution, and 125 g of 60% maleic anhydride aqueous solution were added dropwise. Wherein the sodium sulfite solution was dropped in 2.5 hours, and the maleic anhydride aqueous solution was dropped in 1.5 hours. During the reaction process, the temperature was controlled at 40°C, and after the dropwise addition was completed, the temperature was kept for 30 minutes. Adjust the pH value to 6 with 30% sodium hydroxide to obtain a polycarboxylate plasticizer with a weight average molecular weight of about 18,000.

Embodiment 3

[0039] In this embodiment, the monoesterification of polyene polyamine-based polyethylene glycol with the following structure is selected as monomer A:

[0040]

[0041] In a four-necked flask equipped with a thermometer and a stirrer, add 175g of the polyene polyamine-based polyethylene glycol monoester (molecular weight: 2978) and 85g of water with the structure shown above, heat up to about 50°C and melt, add 6g (35%) hydrogen peroxide, dropwise simultaneously 15% sodium sulfite (2.45g) and sodium methacrylsulfonate (20g) aqueous solution 149.6g, 60% maleic anhydride aqueous solution 145.8g. Wherein the sodium sulfite solution was dropped in 2.5 hours, and the maleic anhydride aqueous solution was dropped in 1.5 hours. During the reaction process, the temperature was controlled at 50°C, and after the dropwise addition was completed, the temperature was kept for 30 minutes. Then lower the temperature to 40° C., adjust the pH value to 8 with 30% sodium hydroxide to obtain a...

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Abstract

The invention provides a polycarboxylic acid concrete plasticizer which is formed by copolymerization of three monomers A, B and C and is a polymer with the weight-average molecular weight of 15000-40000, wherein the three monomers are as follows by weight percent: monomer A is 60-70%, monomer B is 20-30% and monomer C is 5-10%; the structure of the monomer A is shown by the following formula, wherein R1 is alkyl group with less than or equal to five carbon atoms or hydrogen atom; m and n are integers within the range of 0-5; A, B, C, D , E, G, H, J and K are respectively integers within the range of 0-30, but not simultaneously 0; the monomer B is the mixture of more than two of acrylic acid, methacrylic acid, maleic acid, maleic anhydride or maleic anhydride salt; and the monomer C is the mixture of more than two of sodium methyl acryl sulfonate, sodium vinylsulphonate, styrene sodium sulfonate or 2-acrylic amide-2-methyl acrylic acid. The concrete plasticizer has the characteristics of good compatibility with various cements, and high water reducing rate and anti-collapse performance. The invention also provides a preparation method of the plasticizer.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a polycarboxylate plasticizer and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of research on polycarboxylate superplasticizers in my country, domestic polycarboxylates with better performance have begun to appear, and major projects have also begun to turn to domestic polycarboxylates. However, from the perspective of usage, there are still many problems to be solved. As we all know, the adaptability of polycarboxylic acid-based superplasticizers to cement is superior to other types of superplasticizers in theoretical analysis. But in practical applications, the adaptation situation is not satisfactory. There are many cement factories in my country, and the production process, cement variety, composition, fineness, and sources of mixed materials vary widely; sand and gravel materials are in short supply, the sources are com...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C04B103/30
CPCC04B24/2658C04B24/2647C04B2103/30
Inventor 朱建民刘兆滨仲崇纲董振鹏
Owner LIAONING OXIRANCHEM INC
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