Preparation method of concrete thickener

A thickener and concrete technology, applied in the field of concrete thickener preparation, can solve the problems of low market acceptance rate, increased construction difficulty, slow dissolution speed, etc., achieve simple and convenient operation steps, reduce construction difficulty, and ensure maintenance collapsing effect

Active Publication Date: 2014-12-24
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the viscosity modifiers can effectively reduce bleeding on the one hand, but on the other hand, it will reduce the slump expansion of concrete, increase the water demand, and need to add more water reducers to maintain the required slump , and most of them have poor compatibility with polycarboxylate superplast

Method used

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  • Preparation method of concrete thickener
  • Preparation method of concrete thickener

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] Add 10g of N-vinylcaprolactam, 20g of hydroxymethyl acrylate and 10g of sodium allyl sulfonate into the reactor and stir evenly, and then add dropwise an aqueous solution containing 2g of hydrogen peroxide and 0.3g of sodium ascorbate respectively, keeping the temperature at 35°C, and react 3. After hours, a copolymerized product is obtained; the pH is adjusted to 6 with sodium hydroxide solution, and water is added to obtain a concrete thickener with a concentration of 3 wt%.

Example Embodiment

[0024] Example 2

[0025] Add 10g of N,N-dimethylacrylamide, 1g of hydroxyethyl acrylate and 1g of sodium styrene sulfonate into the reactor, stir evenly, and then add dropwise aqueous solutions containing 0.3g of ammonium sulfate and 0.1g of sodium sulfite respectively, and keep The temperature is 45° C. and the reaction is 4 hours to obtain a copolymerized product; the pH is adjusted to 6 with potassium hydroxide solution, and water is added to obtain a concrete thickener with a concentration of 4 wt%.

Example Embodiment

[0026] Example 3:

[0027] Add 10g of N,N-diethylacrylamide, 10g of hydroxybutyl acrylate and 5g of sodium vinyl sulfonate into the reactor, stir evenly, and then dropwise add aqueous solutions containing 1g of potassium persulfate and 0.6g of sodium bisulfite respectively , Keep the temperature at 50 DEG C, and react for 4.5 hours to obtain a copolymerized product; adjust the pH to 7 with sodium hydroxide solution, and add water to obtain a concrete thickener with a concentration of 5 wt%.

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Abstract

The invention discloses a preparation method of a concrete thickener. The preparation method of the concrete thickener comprises subjecting small unsaturated amide monomers, small unsaturated hydroxyl-ester monomers and small unsaturated sulfoacid monomers to aqueous phase radical polymerization under the combined action of a redox system composed of initiating agent and reducing agent to obtain polymerized products; adjusting the PH of the polymerized products to be 6-7; adding water into the polymerized water to obtain the concrete thickener at a concentration of 3-10wt%. According to the preparation method of the concrete thickener, the product performance can be adjusted by controlling the molecular weight of the polymerized products, so that high reaction velocity can be obtained, organic solvent can be omitted, and being non-toxic and pollution-free and simple in operation can be achieved. The concrete thickener prepared through the method can avoid segregation under the premise of achieving high water retention, thereby guaranteeing the slump resisting performance of concrete and achieving stable product performance.

Description

technical field [0001] The invention relates to a preparation method of a concrete thickener, in particular to a specific synthesis method for preparing a concrete thickener by radical polymerization. Background technique [0002] Concrete thickener was first successfully developed by West Germany in 1974, and was officially applied in engineering in 1977. Japan introduced German patents in 1978 to continue research. At present, more than ten companies have developed more than ten kinds of thickener products, with a project volume of several million square meters. In 1984, the my country Petroleum Research Institute successfully developed a propylene series anti-dispersant, named UWB water-retaining agent, and launched a SCR cellulose series thickener, which was used in many large-scale projects and achieved good social and economic benefits. results. [0003] From the perspective of chemical composition, thickeners are mainly polymer additives, which are divided into sever...

Claims

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Application Information

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IPC IPC(8): C08F220/28C08F228/02C08F226/06C08F222/38C08F212/14C08F220/54C08F226/10C08F220/38C08F226/02C04B24/16C04B103/44
Inventor 钱珊珊李楠丁蓓
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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