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Terminal alkenyl polyether and preparation method and application thereof

An alkenyl-terminated polyether and copolymerization reaction technology, which is applied in the field of alkenyl-terminated polyether and its preparation, can solve the problems of cumbersome synthesis process and poor quality stability of polymerization products, and achieve simple process, high water reduction rate and stable performance Effect

Active Publication Date: 2013-07-03
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the continuous updating of concrete technology, the requirements for various indicators of concrete are getting higher and higher. For example, the water-binder ratio of concrete is often lowered, and the fluidity of concrete still needs to meet the needs of pumping construction, so as to better solve the problem of concrete introduction Gas, retardation, bleeding and other problems, and in order to solve these problems, mainly through molecular design and preparation methods of various polymerized monomers of polycarboxylate superplasticizers, the current domestic synthesis of polycarboxylate superplasticizers The process is cumbersome and the quality stability of the polymerization product is poor, so it is imperative to develop a high-performance polycarboxylate water reducer with simple process and convenient operation

Method used

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  • Terminal alkenyl polyether and preparation method and application thereof
  • Terminal alkenyl polyether and preparation method and application thereof
  • Terminal alkenyl polyether and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In the reactor, add 20g of water and 15.8g of monomer A-1 (the weight-average molecular weight is 395), stir and heat to 30°C, then add 2.23g of 25% hydrogen peroxide, and dropwise add solution 1 (1.41g of hanging white block Mixture with 7.5g water) and solution 2 (mixture of 7.84g maleic anhydride and 16g water), keep the temperature at 30°C, add time for 2 hours, aging time for 1 hour, cool to normal temperature after the reaction, use mass Adjust the pH value to neutral with a 40% NaOH aqueous solution, add water, and discharge to obtain an alkenyl-terminated polyether (also known as polycarboxylate water reducer OX-JS-1). The solid content is 40%, and the weight average molecular weight is 16840.

[0064] Wherein the monomer A-1 used has the following structure:

[0065]

[0066] The structure of the finally obtained polycarboxylate water reducer is:

[0067]

Embodiment 2

[0069] In the reactor, add 154g of water and 124g of monomer A-2 (molecular weight is 2400), stir and heat to 40°C, then add 2.23g of 25% hydrogen peroxide, and drop solution 1 (1.27g of ascorbic acid and 7.5g of water mixture ) and solution 2 (the mixture of 14.4g acrylic acid and 17g water), the control temperature is 40 ℃, the time for adding drops is 2 hours, and the aging time is 1 hour. After the reaction is finished, it is cooled to normal temperature and adjusted with a NaOH aqueous solution with a mass concentration of 40%. pH value to neutral, replenish water, and discharge to obtain alkenyl-terminated polyether (also known as polycarboxylate water reducer OX-JS-2). The solid content is 40%, and the weight average molecular weight is 27500.

[0070] Wherein the monomer A-2 used has the following structure:

[0071]

[0072] The structure of the finally obtained polycarboxylate water reducer is:

[0073]

Embodiment 3

[0075] In the reactor, add 133g of water and 124g of monomer A-3 (molecular weight: 3436), stir and heat to 50°C, then add 3.15g of ammonium persulfate, and drop solution 1 (1.12g of sodium bisulfite and 7.5g of water mixture) and solution 2 (the mixture of 9.3g methacrylic acid and 17g water), the temperature is controlled at 50 ℃, the time for dropping is 2.5 hours, and the aging time is 1 hour. NaOH aqueous solution to adjust the pH value to neutral, replenish water, and discharge to obtain terminal alkenyl polyether (also known as polycarboxylate water reducer OX-JS-3). The solid content is 40%, and the weight average molecular weight is 33910.

[0076] Wherein the monomer A-3 used has the following structure:

[0077]

[0078] The structure of the finally obtained polycarboxylate water reducer is:

[0079]

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Abstract

The invention discloses a terminal alkenyl polyether which has a weight-average molecular weight of 15,000-45,000 and is a binary random copolymer obtained by copolymerization of monomers A and B, wherein the monomer A has the structure shown as the following formula (I), the monomer B has the structure shown as the following formula (II), and the symbols in the formulae are defined as the specifications. The invention further discloses a method for preparing the terminal alkenyl polyether, which comprises a step of performing free radical copolymerization of the monomers A and B in an aqueous solution. When the terminal alkenyl polyether disclosed by the invention is used as a concrete water reducer, the terminal alkenyl polyether has the characteristics of stable performance, high early strength, high water-reducing rate and excellent slump resistance. Besides, in the preparation method disclosed by the invention, the raw materials are easily available, the process is simple and environment-friendly, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to an alkenyl-terminated polyether and a preparation method thereof, more specifically, the invention relates to an alkenyl-terminated polyether used as a concrete polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the development of water reducer technology, polycarboxylate water reducer products have been widely used due to their superior performance, and have become an indispensable component in concrete in addition to sand, stone, cement, and water. This kind of water reducing agent has application characteristics such as low dosage, high water reducing rate, no segregation, no bleeding, and good performance of concrete slump. In addition, this type of water reducer also has the characteristics of large degree of freedom in molecular design, no pollution and environmental protection during the synthesis process. However, due to the continuous updating of concrete technology, the...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F222/06C08F220/06C04B24/26C04B103/30
Inventor 朱建民董振鹏范雷赵国超于洪波
Owner LIAONING OXIRANCHEM INC
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