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Method for preparing polycarboxylate superplasticizer by combination of polyether macromonomers of two structures

A polyether macromonomer and macromonomer technology, which is applied in the field of polymer compound preparation, can solve problems such as difficult to meet actual needs, and achieve moderate molecular weight, improved comprehensive performance, and good performance.

Active Publication Date: 2014-01-01
SICHUAN TONGZHOU CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, most polycarboxylate superplasticizers are synthesized by copolymerization of ether macromonomers with small monomers such as acrylic acid and maleic anhydride. The ether macromonomers used are all single macromonomers of the same type. Therefore, the performance of the synthesized water reducer has certain limitations, and it is difficult to meet the actual needs.

Method used

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  • Method for preparing polycarboxylate superplasticizer by combination of polyether macromonomers of two structures
  • Method for preparing polycarboxylate superplasticizer by combination of polyether macromonomers of two structures
  • Method for preparing polycarboxylate superplasticizer by combination of polyether macromonomers of two structures

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Embodiment 1

[0042] The method for preparing a polycarboxylate water reducer by combining polyether macromonomers with two structures is to add 11.0g of macromonomer A, 17.1g of macromonomer C and 55g of water into a flask at 50°C, and place the flask Put it into the oil bath of a magnetic stirrer, heat and stir at 40°C to 50°C, after fully dissolving, add 4g of acrylic acid and 0.4g of mercaptoacetic acid, stir evenly and then heat up to 80°C. 15 g of ammonium persulfate solution with a mass concentration of 2.6% was dripped into the flask through a dropping funnel. After the dropwise addition, keep the temperature at this temperature for 2 hours, then lower the temperature to 30°C, and then add NaOH solution with a mass concentration of 30% to adjust the pH of the resulting solution to 7.0 to obtain a polycarboxylate superplasticizer.

Embodiment 2

[0044] The method for preparing a polycarboxylate water reducer by combining polyether macromonomers with two structures is to add 11.0g of macromonomer A, 17.1g of macromonomer C and 55g of water into a flask at 50°C, and place the flask Put it into the oil bath of a magnetic stirrer, heat and stir at 40°C to 50°C, and after fully dissolving, add 4g of acrylic acid, 0.08g of sodium propylene sulfonate and 0.4g of mercaptoacetic acid, stir evenly and heat up to 78°C. 15 g of ammonium persulfate solution with a mass concentration of 3.0% was dropped into the flask through a dropping funnel. After the dropwise addition, keep the temperature at this temperature for 2 hours, then lower the temperature to 30°C, and then add NaOH solution with a mass concentration of 30% to adjust the pH of the resulting solution to 7.2 to obtain a polycarboxylate superplasticizer.

Embodiment 3

[0046] The method of preparing polycarboxylate water reducer by combining polyether macromonomers with two structures is to add 8.82g of macromonomer A, 13.72g of macromonomer B and 55g of water into the flask at 50°C, and place the flask Put it into the oil bath of a magnetic stirrer, heat and stir under the condition of 40℃~50℃, after fully dissolving, add 3.98g acrylic acid, 0.1g sodium propylene sulfonate, 0.06g acrylonitrile and 0.4g mercaptoacetic acid, and stir evenly The temperature was raised to 85°C. 15 g of ammonium persulfate solution with a mass concentration of 2.6% was dripped into the flask through a dropping funnel. After the dropwise addition, keep the temperature at this temperature for 2 hours, then lower the temperature to 30°C, and then add NaOH solution with a mass concentration of 30% to adjust the pH of the resulting solution to 6.8 to obtain a polycarboxylate superplasticizer.

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Abstract

The invention discloses a method for preparing polycarboxylate superplasticizer by the combination of polyether macromonomers of two structures. The method is characterized by comprising the steps that a macromonomer A (methyl allyl polyoxyethylene ether), a macromonomer C (methyl-2-buten-1-ol polyoxyethylene ether) and water are added into a reactor and are stirred, mixed and dissolved at 40-60 DEG C, then small monomers (acrylic acid and the like) are added, mercaptoacetic acid is added, the temperature is increased to be 75-85 DEG C, an ammonium persulfate solution is added dropwise within 70-90min, heat preservation is carried out for 2-3 hours at the 75-85 DEG C to perform polymerization reaction, then materials after reaction are cooled to be at the room temperature, and the materials are neutralized through a sodium hydroxide aqueous solution of the mass percent concentration being 30% until the pH value ranges from 6.8 to 7.2 so as to prepare the polycarboxylate superplasticizer. The macromonomers and the like are combined and copolymerized, the polycarboxylate superplasticizer with high performance is compounded, and balance and performance regulation between slushing and slump retaining of existing polycarboxylate superplasticizer products are facilitated.

Description

technical field [0001] The invention belongs to the preparation of polymer compounds used in concrete or similar building materials, and relates to a method for preparing polycarboxylate water reducers by combining polyether macromonomers with two structures. The prepared polycarboxylate water reducer is suitable for use as a constituent material of concrete and the like to construct concrete structures such as (long-span) bridges and (high-rise) buildings. Background technique [0002] Concrete is the most widely used building material in the world today. The development of concrete admixtures has a significant effect on modern concrete and is the key force to promote the progress of concrete technology. At present, concrete has entered the era of "green" and "high performance". Correspondingly, higher requirements are put forward for the raw materials, workability, durability, energy saving and environmental protection of concrete, and economy. Polycarboxylate superplasti...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/44C04B24/26C04B24/16C04B103/30
Inventor 舒豆豆刘才林鲜芳燕曹莹张文博杨海君任先艳
Owner SICHUAN TONGZHOU CHEM TECH
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