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A kind of polycarboxylate water reducing agent, its preparation method and application

A technology of water reducing agent and polycarboxylate, applied in the field of polycarboxylate water reducing agent, can solve problems such as poor workability, insufficient water reducing rate of high-strength concrete, and high viscosity

Active Publication Date: 2020-10-23
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] An object of the present invention is to provide a preparation method of polycarboxylate water reducer, said polycarboxylate water reducer has a water reducing rate exceeding that of existing products, and can solve the problems of insufficient water reducing rate, high viscosity, The problem of poor workability, but also has excellent clay tolerance, the market application prospect is broad

Method used

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  • A kind of polycarboxylate water reducing agent, its preparation method and application
  • A kind of polycarboxylate water reducing agent, its preparation method and application
  • A kind of polycarboxylate water reducing agent, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Synthesis of comb polyether monomer:

[0055] In the flask that stirrer is equipped with, add 3-chloropropene 0.2mol, OEGMA (M w The molecular weight is 300) 4mol, CuCl0.2mol, PMDETA 0.2mol, N 2 30min to remove the O in the solution 2 , then close the system, stir and heat up to 60°C, and react at this temperature for 2h. After the reaction is over, the copper salt is removed by filtration to obtain a comb-shaped polyether monomer, and GPC records M w It is 5150, and the molecular weight distribution coefficient is 1.26.

[0056] (2) Synthesis of polycarboxylate water reducer:

[0057] In the flask that stirrer is equipped with, add above-mentioned synthetic comb polyether monomer 0.1mol (according to M w Molecular weight 5150, total 515g), hydrogen peroxide 0.012mol and water 515g, then stir and heat up to 40°C, at this temperature, add dropwise The mixed solution of the mixed solution, the dropping time is 3h, after the dropping is completed, it is incubate...

Embodiment 2

[0059] (1) Synthesis of comb polyether monomer:

[0060] In the flask that stirrer is equipped with, add 2-methyl-3-chloropropene 0.2mol, OEGMA (M w The molecular weight is 400) 4mol, CuBr 0.2mol, bpy 0.4mol, N 2 30min to remove the O in the solution 2 , then close the system, stir and heat up to 80°C, and react at this temperature for 4h. After the reaction is over, the copper salt is removed by filtration to obtain a comb-shaped polyether monomer, and GPC records M w It is 6850, and the molecular weight distribution coefficient is 1.35.

[0061] (2) Synthesis of polycarboxylate water reducer:

[0062] In the flask that stirrer is equipped with, add above-mentioned synthetic comb polyether monomer 0.1mol (according to M w Molecular weight 6850 calculation, total 685g), ammonium persulfate 0.028mol and water 690g, then stir and heat up to 60°C, at this temperature, dropwise add methacrylic acid 0.6mol, mercaptoethanol 0.0245mol, sodium bisulfite 0.0035mol and The mixed ...

Embodiment 3

[0064] (1) Synthesis of comb polyether monomer:

[0065] In the flask that stirrer is equipped with, add 2-methyl-4-bromobutene 0.2mol, OEGMA (M w The molecular weight is 500) 3.6mol, CuBr 0.2mol, TPEN 0.2mol, N 2 30min to remove the O in the solution 2 , Then close the system, stir and heat up to 100°C, and react at this temperature for 6h. After the reaction is over, the copper salt is removed by filtration to obtain a comb-shaped polyether monomer, and GPC records M w It is 7740, and the molecular weight distribution coefficient is 1.25.

[0066] (2) Synthesis of polycarboxylate water reducer:

[0067] In the flask that stirrer is equipped with, add above-mentioned synthetic comb polyether monomer 0.1mol (according to M w Molecular weight 7740 calculation, total 774g), potassium persulfate 0.009mol and water 775g, then stir and heat up to 60°C, at this temperature, dropwise add 0.8mol of itaconic acid, mercaptopropionic acid 0.0315mol, sodium bisulfite 0.0045mol and ...

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Abstract

The invention discloses a novel polycarboxylate water reducer and a preparation method thereof. The novel polycarboxylate water reducer disclosed by the invention is prepared by carrying out a free radical copolymerization reaction on an unsaturated acid monomer and a comb polyether monomer according to a molar ratio of 1:(3-8). The comb polyether monomer is prepared by fully mixing an unsaturatedhalogen compound, a catalyst, a ligand and an OEGMA monomer according to a molar ratio of 1:1:(1-2):(5-25). The preparation method comprises the following steps: adding an oxidizing agent and water into the comb polyether monomer, uniformly mixing tof form a base liquid; dropwise adding a drop liquid comprising an unsaturated acid monomer, a reducing agent, a chain transfer agent and water to carry out a polymerization reaction, thereby obtaining the novel polycarboxylate water reducer. The novel polycarboxylate water reducer disclosed by the invention has the advantages of being high in water reduction performance, high in slump loss resistance, resistant to clay and capable of reducing concrete viscosity. The novel polycarboxylate water reducer is produced by a one-pot process, the process is simple, no waste is produced, and the production process is green and environmentally friendly.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, its preparation method and application, and belongs to the technical field of concrete admixtures. Background technique [0002] The addition of chemical admixtures can greatly improve the durability, workability, applicability, economy and strength of concrete, and provide a strong guarantee for the quality of large-scale projects. Therefore, its wide application is known as the successor to reinforced concrete and prestressed concrete. The 3rd major breakthrough in concrete technology after concrete. Water reducer (also called "cement dispersant") is the most widely researched and used concrete admixture at present. In the case of the same workability of concrete, adding water reducer can effectively save the amount of cement , Reduce water consumption, improve concrete performance and strength. [0003] The application of water reducing agent has gone through a history of nearly a hundred y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F2/02C08F2/38C08F285/00C08F220/06C08F283/06C08F214/14C04B103/30
CPCC04B24/2694C04B2103/302C08F2/02C08F2/38C08F283/065C08F285/00C08F214/14C08F220/06
Inventor 李申桐冉千平杨勇黄振舒鑫毛永琳陆加越
Owner JIANGSU SOBUTE NEW MATERIALS
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