Method for preparing bleed air bleed air controllable polycarboxylic acids water reducing agents

A technology of polycarboxylate-based water reducer, which is applied in the field of preparation of air-entraining controllable polycarboxylate-based water-reducer, can solve problems such as instability, and achieve improved compressive strength, high water-reducing rate, and high-quality products. adaptable effect

Inactive Publication Date: 2008-10-29
WUHAN UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of single polycarboxylate superplasticizer parent product and the instability of traditional post-combination technology, realize the control of gas content in the synthesis process, and promote the diversified development of polycarboxylate superplasticizer parent product

Method used

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  • Method for preparing bleed air bleed air controllable polycarboxylic acids water reducing agents
  • Method for preparing bleed air bleed air controllable polycarboxylic acids water reducing agents

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 138.65g of water into the reactor, and when it is preheated to 75-80°C, add dropwise On the other side, add dropwise a mixed solution consisting of 0.125g sodium bisulfite, 3.875g ammonium persulfate and 138.65g water, drop it in 6~7h, keep it warm for 2~3h after the reaction, cool to room temperature, and use hydrogen Sodium oxide adjusts pH=6.5-7.5 to obtain the air-entraining controllable polycarboxylate water reducer of the present invention. Experiments have proved that the defoaming time of the water reducer is 80s, and the air content of the prepared concrete is 4.5%.

Embodiment 2

[0024] Add 138.65g of water into the reactor, and when it is preheated to 75-80°C, add dropwise On the other side, add dropwise a mixed solution consisting of 0.125g sodium bisulfite, 3.875g ammonium persulfate and 138.65g water, drop it in 6~7h, keep it warm for 2~3h after the reaction, cool to room temperature, and use hydrogen Sodium oxide adjusts pH=6.5-7.5 to obtain the air-entraining controllable polycarboxylate water reducer of the present invention. Experiments have proved that the defoaming time of the water reducer is 30s, and the air content of the prepared concrete is 3.0%.

Embodiment 3

[0026] Add 138.65g of water into the reactor, and when it is preheated to 75-80°C, add dropwise On the other side, add dropwise a mixed solution consisting of 0.25g sodium bisulfite, 3.75g ammonium persulfate and 138.65g water, drop it in 6~7h, keep it warm for 2~3h after the reaction, cool to room temperature, and use hydrogen Sodium oxide adjusts pH=6.5-7.5 to obtain the air-entraining controllable polycarboxylate water reducer of the present invention. Experiments have proved that the defoaming time of the water reducer is 22s, and the air content of the prepared concrete is 2.0%.

[0027] figure 1 and figure 2 It is a graph showing the experimental results of the relationship between the molecular weight of different polyethylene glycol monomethyl ether methacrylates and the defoaming time and gas content of the water reducer of the present invention. Experimental proof (see figure 1 , figure 2 ), the present invention can realize by adjusting the ratio of the produ...

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Abstract

The invention relates to a method for preparing an air entrainment-controllable polycarboxylate water-reducing agent. The method comprises the following steps: an aqueous solution of polyethylene glycol methyl ether methacrylate and methylacrylic acid is added dropwise into 75-80 DEG C water and an aqueous initiator solution is added dropwise in water at the same time, the temperature is maintained at 75-80 DEG C and the addition of reactants is completed within 6-7 hours, the temperature is maintained at 78-80 DEG C for 2-3 hours, the reaction product is naturally cooled down to room temperature and neutralized with a diluted alkali solution until the pH value is in the range from 6.5 to 7.5, and the air entrainment-controllable polycarboxylate water-reducing agent is obtained. The method has the advantages of simple synthetic processing equipment, controllable reaction conditions, no pollution, low cost and suitability for industrialized production. Under the condition of low mixing amount, the synthesized air entrainment-controllable polycarboxylate water-reducing agent exhibits high water-reducing rate, good fluidity and fluidity retention, and controllability in air content; and can efficiently increase concrete workability, prevent the bleeding and segregation of concrete and improve the frost resistance and water impermeability of hydraulic concrete.

Description

technical field [0001] The invention belongs to a preparation method of a concrete water reducer, in particular to a preparation method of an air-entraining controllable polycarboxylate water reducer. technical background [0002] In my country, high-efficiency water reducers are widely used in industrial and civil buildings. With the development of construction technology and construction technology, high-strength concrete, high-fluidity concrete, and commercial concrete have developed rapidly in recent years, and these concretes must be mixed with high-efficiency water-reducing agents or composite water-reducing agents with high-efficiency water-reducing agents. The development of coastal development zones, Shanghai, Tianjin, Beijing and other places is particularly prominent. In addition, steam-cured, high-durability, high-impermeability concrete, bridges, sleepers and other concrete must also be mixed with superplasticizers. In recent years, my country's commercial con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C04B24/24C04B103/30
Inventor 马保国谭洪波马玲李亮张慢吕国玉何向全许红生
Owner WUHAN UNIV OF TECH
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