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Concrete polycarboxylate water reducing agent and preparing method thereof

A polycarboxylic acid and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of weak environmental adaptability, poor cement compatibility, fast slump loss, etc., and achieves concentrated molecular weight distribution, high water reduction rate, and reduced The effect of pollution

Inactive Publication Date: 2016-06-01
国能辽宁环保产业集团有限公司材料分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the domestic polycarboxylate superplasticizers have defects such as poor compatibility with cement, weak adaptability to the environment, and rapid loss of slump, which brings great difficulty to construction.

Method used

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  • Concrete polycarboxylate water reducing agent and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Prepare a polycarboxylate water reducer for concrete. The raw materials are monomer A and acrylic acid. The chemical structural formula (I) of monomer A is:

[0033] (I)

[0034] Where m=50, n=2, the selected components and mass ratio are: methallyl polyoxyethylene ether: acrylic acid: ammonium persulfate: sodium hypophosphite: thioglycolic acid=7.27:1:0.036:0.023 : 0.064; In a reaction vessel equipped with a stirrer, add 160g monomer A (molecular weight 2400) and 130g water, stir until monomer A dissolves, add 0.8g ammonium persulfate, after stirring evenly, add the aqueous solution of acrylic acid dropwise at the same time (including 22g of acrylic acid, 50g of water) and aqueous solution of thioglycolic acid and sodium hypophosphite (of which 1.4g of thioglycolic acid, 0.5g of sodium hypophosphite, and 45g of water), add two-thirds of it dropwise in the first 45 minutes, and the remaining one-third The dropwise addition is completed in the last 45 minut...

Embodiment 2

[0037]Example 2: Prepare a polycarboxylate water reducer for concrete. The raw materials are monomer A and methacrylic acid. In the chemical structural formula (I) of monomer A, m=39, n=10, and the selected components and mass ratio For monomer A: methacrylic acid: hydrogen peroxide: ascorbic acid: 3-mercaptopropionic acid = 7: 1: 0.0532: 0.016: 0.056; in a reaction vessel equipped with a stirrer, add 350g monomer A (molecular weight 2400) and 180g Water, stir until monomer A dissolves, add 2.66g of hydrogen peroxide, stir evenly, add dropwise the aqueous solution of acrylic acid (50g of acrylic acid, 80g of water) and the aqueous solution of 3-mercaptopropionic acid and ascorbic acid (2.8g of 3-mercaptoacetic acid , ascorbic acid 0.8g, water 96g), the dropping time is 3.5h, after the reaction is completed, the temperature is lowered to room temperature, and the pH value is adjusted to neutral with NaOH aqueous solution, and the polycarboxylate water reducer is obtained, and it...

Embodiment 3

[0040] Embodiment 3, prepare a kind of concrete polycarboxylate superplasticizer, raw material adopts monomer A and monomer B (acrylic acid and maleic anhydride), m=17, n=31 in monomer A chemical structural formula (I), choose The components and mass ratios are monomer A: acrylic acid: maleic anhydride: ammonium persulfate: sodium bisulfite: 2-mercaptoacetic acid=11.25:1:1.3:0.12:0.1:0.054; In the reaction vessel, add 225g of monomer A (molecular weight: 2600) and 260g of water, stir until the monomer A is dissolved, add 2.4g of ammonium persulfate, stir evenly, and add the aqueous solution of acrylic acid and maleic anhydride (20g of acrylic acid, Maleic anhydride 26g, water 56g) and 2-mercaptoacetic acid, sodium bisulfite aqueous solution (including 2-mercaptoacetic acid 2.0g, sodium bisulfite 1.08g, water 45g), dropwise time is 2h, cool down after the reaction To normal temperature, adjust the pH value to neutral with NaOH aqueous solution to obtain polycarboxylate water re...

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Abstract

The invention provides a concrete polycarboxylate water reducing agent and a preparing method thereof. The concrete polycarboxylate water reducing agent is a polymer copolymerized by a monomer A and a monomer B, wherein the weight-average molecular weight of the polymer ranges from 5,000 to 30,000. The chemical structural formula is shown in the specification, wherein m is an integer ranging from 14 to 66, n is an integer ranging from 0 to 40, R1 is H or COOH, and R2 is H or CH3. The performance is stable, the water-reducing rate is high, and cement adaptation is high; the concrete polycarboxylate water reducing agent has the excellent water reducing performance and the excellent slump retaining performance, and has the advantages that the preparing process is simple in technology, time is short, reaction energy consumption is low, operability is high, and pollution to the environment is avoided.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a concrete polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's infrastructure construction, especially the large-scale construction of high-speed rail projects in recent years, the quality requirements for commercial concrete are becoming more and more stringent during the construction process, and it is basically required that all high-performance concrete be used. In high-performance concrete, adding traditional polycondensation-type water reducing agents such as naphthalene, sulfamate, and melamine, the water reducing rate is average, and the production process of naphthalene and other water reducing agents will pollute the environment . Therefore, the use of environmentally friendly polycarboxylate superplasticizers is very extensive, and the application volume is also increasing year by year. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F4/40C08F2/38C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B2103/302C08F2/38C08F4/40C08F220/06C08F222/06
Inventor 刘晓蒙王刚闫洪坤吴雄伟刘金鹏
Owner 国能辽宁环保产业集团有限公司材料分公司
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