Preparation method of polycarboxylate superplasticizer with high water reducing rate

A high water-reducing polycarboxylic acid and water-reducing agent technology, applied in the field of chemical building materials and construction, can solve the problems of low product conversion rate, increased cost, and color

Active Publication Date: 2013-12-25
GUANGDONG KEZHIJIE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The first generation of water reducers are mainly lignin sulfonates, which have a wide range of sources and simple and mature synthesis processes; however, this type of water reducer has a small water reducing rate, a large amount of air entrainment, low strength, and serious retardation , the scope of application is small
[0004] The second type of water reducer is mainly naphthalene, aliphatic, and amino water reducers. This type of water reducer has a general water addition rate and a mature synthesis process; however, there are many toxic substances in the synthesis process, the amount of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) 40 parts of methallyl polyoxyethylene polyoxypropylene ether TPEG (molecular weight is 2000) and 2 parts of sodium methacrylate sulfonate are prepared into a monomer mixed aqueous solution with a total mass fraction of 50%, as Component 1 is added dropwise; 0.7 parts of azobisisobutylamidine hydrochloride, 3.3 parts of ammonium persulfate and 1.6 parts of initiation accelerator sodium thiocyanate are prepared into an initiator mixed aqueous solution with a total mass fraction of 10%. , as the drop component 2; 20 parts of acrylic acid is formulated into a 50% aqueous solution as the drop component 3; 0.5 parts of dodecanethiol is formulated into a 10% aqueous solution as the drop component 4 .

[0024] (2) Put 160 parts of TPEG (molecular weight 2000) and 6 parts of sodium vinyl sulfonate, and 200 parts of deionized water into the reactor, stir evenly, and start to heat up; when the temperature rises to the dropping temperature of 50°C , start to drop components 1 ...

Embodiment 2

[0026] (1) 40 parts of TPEG (molecular weight: 2400) and 0.5 parts of sodium methacryl sulfonate are prepared into a monomer mixed aqueous solution with a total mass fraction of 50% as dropwise component 1; 0.25 parts of azobis Isobutyl imidazoline hydrochloride, 1.75 parts of potassium persulfate and 0.8 parts of initiation accelerator sodium thiocyanate are prepared into a mixed aqueous solution of initiator with a total mass fraction of 10%, as drop component 2; 36 parts of acrylic acid Prepare a 50% aqueous solution as the dropwise component 3; prepare 1.6 parts of thioglycolic acid into a 10% aqueous solution as the dropwise component 4.

[0027] (2) Put 160 parts of TPEG (molecular weight 2400) and 1 part of sodium vinyl sulfonate, and 120 parts of deionized water into the reactor, stir evenly, and start to heat up; when the temperature rises to the dropping temperature of 55°C , start to drop components 1 to 4 into the reactor in sequence and at a constant speed, add dr...

Embodiment 3

[0029] (1) 40 parts of TPEG (molecular weight: 2800) and 1.3 parts of sodium allyl sulfonate were prepared into a monomer mixed aqueous solution with a total mass fraction of 50% as component 1; 0.14 parts of azobis Isobutylimidazoline hydrochloride, 1.2 parts of hydrogen peroxide and 0.6 parts of initiation accelerator sodium thiocyanate are formulated into a total mass fraction of 10% initiator mixed aqueous solution, as dropwise component 2; 27 parts of acrylic acid are formulated into The mass fraction is 50% aqueous solution, as the dripping component 3; 1.00 parts of mercaptopropionic acid is prepared into a mass fraction of 10% aqueous solution, as the dripping component 4.

[0030] (2) Put 160 parts of TPEG (molecular weight 2800), 4.00 parts of sodium allyl sulfonate, and 200 parts of deionized water into the reactor, stir evenly, and start to heat up; when the temperature rises to the dropping temperature of 50°C Finally, start to drop components 1 to 4 into the reac...

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PUM

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Abstract

The invention discloses a preparation method of a polycarboxylate superplasticizer with a high water reducing rate. The polycarboxylate superplasticizer is prepared through adopting the preparation method comprising the following steps: according to parts by mass, with an unsaturated polyether macromonomer and an unsaturated sulfonic acid micromonomer as dropwise adding components 1, an azo initiator, a peroxide initiator and an initiation accelerant as dropwise adding component 2, acrylic acid as a dropwise adding component 3 and a molecular weight modifier as a dropwise adding component 4, feeding the unsaturated polyether macromonomer and the unsaturated sulfonic acid micromonomer as well as deionized water into a reactor, stirring and increasing the temperature; when the temperature rises to a dropwise adding temperature, orderly dropwise adding the dropwise adding components 1-4 to the reactor at a constant speed for 3-5 hours; after the dropwise adding is finished, preserving heat for 0.5 hour to 1.5 hours to obtain a copolymerization product; and after the reaction is finished, adding an aqueous solution of sodium hydroxide for neutralization to obtain the polycarboxylate superplasticizer having the pH value in the range from 6 to 7. The preparation method disclosed by the invention is simple in reaction process, easy to control the reaction and low in production cost; the product obtained through the reaction is high in water-reducing rate and good in slump loss resistant and slow-release properties.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, in particular to a preparation method of a high water-reducing polycarboxylate water-reducer. Background technique [0002] Since the 1930s, concrete admixtures have developed rapidly. At present, there are many types of concrete superplasticizers on the market with different functions. Different types of superplasticizers can achieve different effects. Water reducers are usually divided into ordinary water reducers (first generation), high-efficiency water reducers (second generation) and high-performance water reducers (third generation). [0003] The first generation of water reducers are mainly lignin sulfonates, which have a wide range of sources and simple and mature synthesis processes; however, this type of water reducer has a small water reducing rate, a large amount of air entrainment, low strength, and serious retardation , The scope of application is small. [0...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F228/02C08F212/14C08F220/06C08F4/30C08F4/04C04B24/16C04B103/30
Inventor 郭毅伟方云辉蒋卓君柯余良谢木和郭鑫祺林添兴
Owner GUANGDONG KEZHIJIE NEW MATERIALS
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