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Method for mixing polyester-ether macromonomers for preparation of polycarboxylic acid water reducer

A technology of polyether macromonomer and polycarboxylic acid, applied in the field of water reducing agent, achieves the effects of easy synthesis process, increased strength and good slump retention performance

Inactive Publication Date: 2015-04-08
四川吉龙化学建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing polycarboxylate water reducer by mixing polyester ether macromonomers in order to overcome the limitations of existing polycarboxylates

Method used

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  • Method for mixing polyester-ether macromonomers for preparation of polycarboxylic acid water reducer

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: a kind of method for preparing polycarboxylate water-reducer by mixing polyester ether macromonomer, it comprises the following steps:

[0035] (1) Add polyethylene glycol and maleic anhydride with a molecular weight of 1000 into the reactor at a molar ratio of 1:1.1, and simultaneously feed nitrogen into the closed reactor at 40h / L for 30min to exhaust the air, and then nitrogen Reduce the flow rate to 20h / L, raise the temperature of the reactor to 58°C, wait until all the materials are melted, stir evenly, and make a mixed solution A;

[0036] (2) Stabilize the temperature at 50°C, slowly add 98% concentrated sulfuric acid of 0.3% by weight to the mixed solution A, stir for 8 minutes, raise the temperature to 100°C, and keep the temperature for 6 hours to obtain the mixed solution B;

[0037] (3) After the heat preservation is completed, the temperature is lowered to 48° C., the nitrogen gas is turned off, and water is added to the mixed solution B to ad...

Embodiment 2

[0042] Embodiment 2: a kind of method for preparing polycarboxylate water-reducer by mixing polyester ether macromonomer, it comprises the following steps:

[0043] (1) Polyethylene glycol and maleic anhydride with a molecular weight of 400 are added in the reactor with a mol ratio of 1:1.5, and nitrogen is passed into the closed reactor for 60 min at 50 L / h simultaneously to exhaust the air, and then the nitrogen Reduce the flow rate to 30L / h, raise the temperature of the reactor to 62°C, wait until all the materials are melted, stir evenly, and make a mixed solution A;

[0044] (2) Stabilize the temperature at 60°C, slowly add 98% concentrated sulfuric acid of 0.5% by weight to the mixed solution A, stir for 12 minutes, raise the temperature to 130°C, keep the temperature for 3 hours, and obtain the mixed solution B;

[0045](3) After the heat preservation is over, cool down to 52° C., turn off the nitrogen, add water to the mixed solution B, and adjust it into a maleic anhy...

Embodiment 3

[0050] Embodiment 3: a kind of method for preparing polycarboxylate water-reducer by mixing polyester ether macromonomer, it comprises the following steps:

[0051] (1) Polyethylene glycol and maleic anhydride with a molecular weight of 600 are added in the reactor with a mol ratio of 1:1.3, and nitrogen is passed into the closed reactor for 40min with 42L / h simultaneously to exhaust the air, and then the nitrogen Reduce the flow rate to 23L / h, raise the temperature of the reactor to 60°C, wait until all the materials are melted, stir evenly, and make a mixed solution A;

[0052] (2) Stabilize the temperature at 53°C, slowly add 98% concentrated sulfuric acid of 0.4% by weight to the mixed solution A, stir for 10min, the temperature rises to 110°C, and keep the temperature for 4.5h to obtain the mixed solution B ;

[0053] (3) After the heat preservation, turn off the nitrogen, cool down to 50°C, add water to the mixed solution B, and adjust it into a maleic anhydride polyeth...

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Abstract

The invention discloses a method for mixing polyester-ether macromonomers for preparation of a polycarboxylic acid water reducer, and belongs to the field of a water reducer. According to the method, two macromonomers and maleic anhydride polyethylene glycol are taken as raw materials to produce the polycarboxylic acid water reducer through multiple polymerization in the presence of acrylic acid, a chain transfer agent and a reducing agent. By use of influence of the structure and performance of the polycarboxylic acid water reducer by structure difference of polyether macromonomers and ester macromonomers, water reducing ratio and slump retention property of the polycarboxylic acid water reducer can be balanced, and air entraining ratio of the polycarboxylic acid water reducer can be effectively reducted by use of ester ether mixed structure. The method has the advantages of simple process, convenient control, easy industrialization, low cost, safety and environmental protection.

Description

technical field [0001] The invention belongs to the field of water reducers, and in particular relates to a method for preparing polycarboxylate water reducers by mixing polyester ether macromonomers. Background technique [0002] Polycarboxylate (PC) water reducer is a new type of high-performance water reducer following naphthalene, aliphatic and sulfamate-based water reducers. It has high water-reducing rate, good dispersion of cement particles, and Low cement content, good cement adaptability, good slump retention without prolonging the setting and hardening time of concrete, high strength, green environmental protection and other performance characteristics. At present, polycarboxylate superplasticizer has been widely used in a series of major projects such as high-speed railways, bridges, and tunnels, and is one of the most promising cement admixtures in the 21st century. [0003] Polycarboxylate superplasticizer can improve the fluidity of concrete, reduce the amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F283/06C08F220/06C08G65/48C04B24/26C04B103/30
Inventor 沈依勇吴强刘志虎
Owner 四川吉龙化学建材有限公司
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