Preparation method of polycarboxylate superplasticizer

The technology of a water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent and its preparation, can solve the problems of high cost, complicated preparation process, increased difficulty and complexity, etc., and achieves low cost, simple preparation process, The effect of enhancing adsorption performance and charge adsorption capacity

Active Publication Date: 2015-09-09
新疆玉鑫蕊科技开发有限责任公司
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  • Application Information

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Problems solved by technology

This method needs to synthesize the macromonomer first, then polymerize, the preparation process is complicated, the cost is high, and the esterification reaction is a reversible reaction, and the product water needs to be removed in time to make the reaction proceed to the direction of producing the macromonomer, which increases the reaction time. Difficulty and Complexity

Method used

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  • Preparation method of polycarboxylate superplasticizer

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Effect test

Embodiment 1

[0024] Under the action of stirring, add methallyl polyethylene glycol 10g and 25g deionized water to the reaction vessel, heat the reaction vessel and stir the methallyl polyethylene glycol, when the temperature reaches 65°C, add Add 30 g of acrylamide and 0.2 g of sodium dodecyl sulfonate dropwise into the reaction vessel for 3 hours, and simultaneously add 0.4 g of ammonium persulfate and 0.3 g of mercaptoacetic acid dropwise for 4 hours; After the dropwise addition, keep warm for 4 hours, cool down to 35° C., add 35% sodium hydroxide solution to adjust the pH value to 6 to obtain a polycarboxylate water reducer.

Embodiment 2

[0026] Under the action of stirring, add methallyl polyethylene glycol 15g and 35g deionized water to the reaction vessel, heat the reaction vessel and stir the methallyl polyethylene glycol, when the temperature reaches 70°C, add Add 45 g of acrylamide and 0.4 g of sodium dodecyl sulfonate dropwise to the reaction vessel for 3.5 hours, and simultaneously add 0.6 g of ammonium persulfate and 0.5 g of mercaptoacetic acid dropwise for 5 hours; After the dropwise addition, keep warm for 4 hours, lower the temperature to 35° C., add 35% sodium hydroxide solution to adjust the pH value to 7 to obtain a polycarboxylate water reducer.

Embodiment 3

[0028] Under the action of stirring, add 20 g of methallyl polyethylene glycol and 55 g of deionized water to the reaction vessel, heat the reaction vessel and stir the methallyl polyethylene glycol, and when the temperature reaches 80° C. 60g of acrylamide and 0.6g of sodium dodecyl sulfonate were added dropwise to the reaction vessel, and the dropping time was 4.5 hours, and 1g of ammonium persulfate and 0.8g of mercaptoacetic acid were added dropwise at the same time, and the dropping time was 6 hours; After adding, keep it warm for 4 hours, cool down to 35°C, add 35% sodium hydroxide solution to adjust the pH value to 7 to obtain the polycarboxylate superplasticizer.

[0029] In order to verify the performance of the polycarboxylate superplasticizer of the present invention on cement, conventional polycarboxylate superplasticizers on the market were used as a comparative test to compare the static slurry fluidity and slump of cement after adding the superplasticizer. The t...

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Abstract

The invention relates to a preparation method of a polycarboxylate superplasticizer, belonging to the technical fields of building materials and cement concrete admixtures. The polycarboxylate superplasticizer is prepared by taking methylallyl polyethylene glycol and acrylamide as reaction monomers and sodium dodecyl sulfonate as a surface absorption activator, adding a chain transfer agent and an initiator, and finally, regulating the PH value to 6-7 by using an alkaline solution. The polycarboxylate superplasticizer is high in yield and good in performance; and due to the addition of sodium dodecyl sulfonate, the saturation rate of charges adsorbed by particles on a concrete surface can be increased, the flowability of cement in concrete stirring can be improved, the stirring time can be shortened, the efficiency can be increased, and an anti-adhesion effect is better taken. The polycarboxylate superplasticizer is simple in preparation process, low in cost, high in water reducing efficiency, good in cement and concrete compatibility and capable of effectively improving the flowability, slump constant, superstrength and durability of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials and cement concrete admixtures, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is the largest and most widely used building material in the world. Over the past few decades, concrete technology has entered a new stage of development, and its application range has been further expanded. The development of new technologies such as pumped concrete, self-compacting concrete, underwater non-dispersible concrete, sprayed concrete, polymer concrete, etc., high-strength and high-performance concrete requires concrete to have the characteristics of setting adjustment, reducing heat of hydration, fluidity, high strength, light weight and High durability performance, while also requiring the preparation of concrete with low energy consumption, low cost, and suitable for rapid construction. [0003] In order to meet the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F2/38C04B24/26C04B103/30
Inventor 卢晔
Owner 新疆玉鑫蕊科技开发有限责任公司
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