Ultra-high efficiency polycarboxylate water reducer and preparation method thereof

A high-efficiency polycarboxylate and polycarboxylate technology, which is applied in the field of super-efficient polycarboxylate water reducers, can solve problems such as rapid loss of concrete slump, complex mineralization components, and impact on project quality. Improve various performances, high water reduction effect, and good adaptability

Inactive Publication Date: 2011-10-05
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete prepared with naphthalene-based water reducer loses fast in slump (more than half of the slump can be lost in one hour), which makes construction difficult and affects project quality
At the same time, because the naphthalene-based water reducer contains too much formaldehyde, some countries ha

Method used

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  • Ultra-high efficiency polycarboxylate water reducer and preparation method thereof
  • Ultra-high efficiency polycarboxylate water reducer and preparation method thereof
  • Ultra-high efficiency polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 20g of MPEG (2000), 8.58g of cyclohexane, 0.96g of catalyst p-toluenesulfonic acid, and 0.0086g of polymerization inhibitor hydroquinone into a four-necked flask with a water separator. After heating to 80°C, add 1.44 g acrylic acid, heat up to 130°C for 8 hours, after the reaction, pour the product into a small beaker filled with n-hexane, precipitate in an ice-water bath, and then place it in a vacuum oven at 30°C for 24 hours to obtain esterified Monomer MPEGAA.

Embodiment 2

[0023] Add 20g MPEG (2000), 8.72g cyclohexane, 0.98g catalyst p-toluenesulfonic acid, 0.0108g polymerization inhibitor hydroquinone into a four-necked flask with water separator, after heating to 80°C, add 1.80 g of acrylic acid, heated up to 130°C for 8 hours, after the reaction, pour the product into a small beaker filled with n-hexane, precipitate it in an ice-water bath, and then place it in a vacuum oven at 30°C for 24 hours to obtain esterified Monomer MPEGAA.

Embodiment 3

[0025] Add 20g of MPEG (2000), 9.01g of cyclohexane, 1.013g of catalyst p-toluenesulfonic acid, and 0.0151g of polymerization inhibitor hydroquinone into a four-necked flask with a water separator. After heating to 80°C, add 2.52 g of acrylic acid, heated up to 130°C for 8 hours, after the reaction, pour the product into a small beaker filled with n-hexane, precipitate it in an ice-water bath, and then place it in a vacuum oven at 30°C for 24 hours to obtain esterified Monomer MPEGAA.

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Abstract

The invention discloses an ultra-high efficiency polycarboxylate water reducer and a preparation method thereof. The preparation method of the ultra-high efficiency polycarboxylate water reducer is characterized in that methoxypolyethylene glycol (with a constitutional formula HO-(CH2-CH2)n-CH3, wherein n is in a range of 20 to 45), acrylic acid, etc. are utilized as raw materials to synthesize esterified macromers and then acrylic acid, the esterified macromers, acrylamide, sodium alkyl sulfonate, etc. undergo a copolymerization reaction in the presence of ammonium persulfate as an initiator. The ultra-high efficiency polycarboxylate water reducer of the invention has the advantages of simple processes, no pollution, low contents of additives, high water reducing rate, good adaptability for various cements, high strength, etc.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a super-efficient polycarboxylate water reducer. Background technique [0002] Water reducer is the most commonly used and important admixture for concrete. With the increasing demand for high-strength and ultra-high-strength fluidity concrete, there is a need for high-performance water reducing agents that are environmentally friendly and maintain good concrete fluidity. [0003] Polycarboxylate water reducer is the most comprehensive and environmentally friendly concrete water reducer. The polycarboxylate high-efficiency water reducer with a comb-shaped molecular structure is suitable for the preparation of high-strength, ultra-high-strength, high-fluidity due to its high water-reducing rate, good slump retention performance, low dosage, no pollution, and less retarding time. durable and self-compacting concrete. It has a strong dispersion ability to cement, and its water reduction ef...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F290/06C08G65/48C04B103/30
CPCC04B24/2647
Inventor 刘亚青孙友谊蔡苇崔鸿越赵贵哲
Owner ZHONGBEI UNIV
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