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Tackifier of cement-base material and its preparation method and application

A technology of cement-based materials and tackifiers, applied in the field of building materials, to reduce costs, solve segregation and bleeding problems, and achieve good uniformity

Inactive Publication Date: 2010-12-15
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

They improve the firmness and homogeneity of high fluidity concrete and self-compacting concrete to a certain extent, but their high price is not conducive to popularization and application

Method used

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  • Tackifier of cement-base material and its preparation method and application

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Effect test

Embodiment 1

[0018] Example 1. Preparation method of tackifier for cement-based materials.

[0019] (1) 10 parts of acrylic acid, 50 parts of methylphenylpropane containing phenolic hydroxyl group and the catalyst vitriol oil were added to the four-necked flask, and the temperature was raised to 90 ± 2°C while stirring, and the esterification reaction was performed for 6 hours; Add 3 parts of acrylic acid and catalyst potassium persulfate, the reaction temperature is 85 ± 2 ℃, react for 3 hours, then drip 20 parts of formaldehyde solution with a concentration of 37%, react for 1 hour; adjust the pH of the reaction mixture with NaOH after the reaction is completed 6 to 7.

[0020] (2) 10 parts of maleic acid, 50 parts of methylphenylpropane containing phenolic hydroxyl group and catalyst p-toluenesulfonic acid were added to the four-necked flask, and the temperature was raised to 90 ± 2°C while stirring, and the esterification reaction was performed for 6 hours; After the reaction is compl...

Embodiment 2

[0021] Embodiment 2, the application example of tackifier

[0022] Application example of the present invention in self-compacting concrete with large volume of fly ash: cement 230kg, fly ash 230kg, sand 900kg, 5~20mm stone 800kg, water 170kg, high-efficiency water reducer 1.5kg, the tackifier of the present invention 138g. The indicators of concrete after mixing are as follows: slump expansion 700mm, J-ring expansion 660mm, L-box height ratio 0.87, U-box flow height 330mm, concrete viscosity 65Pa·S, water retention and viscosity increase effect is obvious, no obvious Segregation and bleeding phenomena.

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Abstract

The present invention discloses an adhesion promoter of a cement-based material and the preparing method and the use thereof, the invention is the adhesion promoter of the cement-based material which is obtained using the papermaking waste liquor, extracting the methyphenylpropane of the phenol-containing hydroxyl group, generating esterifying reaction with the carboxyl monomer under the functionof the catalyst and then copolymerizing with the carboxyl acid, or graft-copolymerizing with the acidamide substance and ahs a comb-shaped structure. When the adhesion promoter is mixed into the cement-based material the appropriate thickness and workability can be endowed to the cement-based material, the mixed water is leaded to be uniformly distributed in the cement-based material and can be kept stable for a long time without discharging out, at the same time the adhesion promoter of the invention increases the viscosity of the paste and leads to that the particles of aggregate is not easily moved thereby effectively preventing the disengagement and facilitating that the cement-based material always keeps better homogeneity.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a tackifier for cement-based materials, a preparation method and its application in concrete construction. Background technique [0002] In modern concrete construction, high fluidity concrete and self-compacting concrete are more and more widely used due to their high constructability. However, large fluidity concrete and self-compacting concrete often have segregation and bleeding phenomena during construction, which has adverse effects on construction operations and project quality. Therefore, it needs to add a certain amount of substance to keep it sticky and firm. The thickeners used in the past are mainly cellulose ethers, including sodium carboxymethyl cellulose, methyl cellulose, ethyl cellulose, and hydroxypropyl methyl cellulose ether. They have improved the solidity and homogeneity of high fluidity concrete and self-compacting concrete to a certain extent, but thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B103/44
CPCC04B24/2647C04B28/02C04B2103/34C04B2111/00103
Inventor 蒋亚清杨培杰潘云峰
Owner HOHAI UNIV
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