A kind of preparation method of polycarboxylate water reducer

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

Active Publication Date: 2017-08-25
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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  • A kind of preparation method of polycarboxylate water reducer

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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 30g of acrylamide and 0.2g of sodium dodecylbenzenesulfonate dropwise to the reaction vessel for 3 hours, and simultaneously add 0.4g of ammonium persulfate and 0.3g of mercaptoacetic acid dropwise for 4 hours After the dropwise addition, keep warm for 4 hours, cool down to 35° C., add a 35% sodium hydroxide solution to adjust the pH 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 45g of acrylamide and 0.4g of sodium dodecylbenzenesulfonate dropwise to the reaction vessel for 3.5 hours, and simultaneously add 0.6g of ammonium persulfate and 0.5g of mercaptoacetic acid dropwise for 5 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 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 dodecylbenzenesulfonate were added dropwise into the reaction vessel for 4.5 hours, and 1g of ammonium persulfate and 0.8g of mercaptoacetic acid were added dropwise at the same time for 6 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.

[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 fluidity and slump of the cement after adding the superplasticizer. The test structure is shown in T...

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Abstract

The invention relates to a preparation method of a polycarboxylate water reducer, belonging to the technical field of building materials and cement concrete admixtures. The polycarboxylate water-reducer of the present invention uses methallyl polyethylene glycol and acrylamide as reaction monomers, uses sodium dodecylsulfonate as surface adsorption active agent, and adds chain transfer agent and initiator agent, and finally adjust the pH to 6-7 with lye to prepare the water reducer. The polycarboxylate superplasticizer of the present invention has high yield and good performance, and the added sodium dodecylsulfonate can promote the saturation rate of the adsorption charge of concrete surface particles, increase the flowability of cement in concrete mixing, and reduce the mixing time , improve efficiency, and play a better anti-adhesion effect. The polycarboxylate water-reducer of the invention has simple preparation process, low cost, high water-reducing efficiency, good compatibility with cement and concrete, and can effectively improve the fluidity, slump, super strength 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 Patents(China)
IPC IPC(8): C08F283/06C08F220/56C08F2/38C04B24/26C04B103/30
Inventor 王建宏王鑫
Owner 新疆玉鑫蕊科技开发有限责任公司
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