A polycarboxylate water reducer for high mud-containing concrete and its synthesis method

A technology for concrete and polycarboxylic acid, applied in the field of polycarboxylate water reducing agent and its preparation, can solve the problems of poor concrete construction performance, poor carbonation resistance, difficult construction and the like, and achieves improved mechanical properties and construction performance, Improved adaptability, wide application effect

Active Publication Date: 2016-01-20
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will increase the specific surface area of ​​the soil, making the polycarboxylate superplasticizer intercalate between the clay mineral layers, and a small amount of clay can absorb a large amount of superplasticizer, which shows that the construction performance of concrete becomes very poor, and some even difficult to construct
At the same time, with the increase of mud content, the carbonation depth of concrete increases obviously, and the anti-carbonation ability gradually deteriorates; the shrinkage of concrete increases, which has an adverse effect on the durability of concrete

Method used

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  • A polycarboxylate water reducer for high mud-containing concrete and its synthesis method
  • A polycarboxylate water reducer for high mud-containing concrete and its synthesis method
  • A polycarboxylate water reducer for high mud-containing concrete and its synthesis method

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Synthetic example

[0037] In a 1000mL four-necked flask equipped with mechanical stirring, a temperature controller, and a dripping device, add 240mL of deionized water and 1.33mL of ammonium persulfate aqueous solution with a mass concentration of 100g / L into the reactor, stir well, and then add 2.22mL of acrylic acid and 0.15mL of isopropanol, stir and raise the temperature, keep the temperature at 60-65°C, start to drop 17.78mL of acrylic acid and 1.33mL of ammonium persulfate aqueous solution with a mass concentration of 100g / L at the same time, and finish the dropwise addition in 20 minutes.

[0038] In a specific embodiment, the compound C is sodium ethyleneoxysulfonate. The above compound C can be purchased from the market.

[0039] In another embodiment, the present invention provides a kind of preparation method of polycarboxylate superplasticizer for high mud-containing concrete, the method comprises the following steps:

[0040] 1) Add deionized water and the first part of ammonium p...

Embodiment 1

[0054] In a 1000mL four-necked flask equipped with mechanical stirring, a temperature controller, and a dripping device, add 240mL of deionized water and 1.33mL of ammonium persulfate aqueous solution with a mass concentration of 100g / L into the reactor, stir well, and then add 2.22mL of acrylic acid and 0.15mL of isopropanol, stir to raise the temperature, keep the temperature at 60-65°C, start to drop 17.78mL of acrylic acid and 1.33mL of ammonium persulfate solution with a mass concentration of 100g / L at the same time, and finish the dropwise addition in 20 minutes. Add 90g of compound A1 (2-vinyloxy alcohol polyoxyethylene ether, ethylene oxide addition number 22) into the reactor, maintain the temperature at 60-65°C, and start adding ethyleneoxy sodium sulfonate and A solution consisting of a mixed solution of thioglycolic acid (17.55g sodium ethyleneoxysulfonate, 1.26g thioglycolic acid dissolved in 45.1g deionized water) and 21mL of ammonium persulfate aqueous solution w...

Embodiment 2

[0057] In a 1000mL four-neck flask equipped with mechanical stirring, a temperature controller, and a dripping device, add 240mL of deionized water and 2.39mL of ammonium persulfate aqueous solution with a mass concentration of 100g / L into the reactor, stir well, and then add 4mL of acrylic acid and 0.27mL of isopropanol were stirred to raise the temperature, and the temperature was kept at 60-65°C. At the same time, 32mL of acrylic acid and 2.39mL of ammonium persulfate solution with a mass concentration of 100g / L were added dropwise, and the dropwise addition was completed in 20 minutes. Add 180g of compound A2 (allyl alcohol polyoxyethylene ether, ethylene oxide addition number 50) into the reactor, maintain the temperature at 60-65°C, and start to dropwise add sodium ethyleneoxysulfonate and mercaptoacetic acid simultaneously. A solution composed of a mixed solution (11.70g sodium ethyleneoxysulfonate, 1.04g mercaptoacetic acid dissolved in 22.28g deionized water) and 17.23...

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Abstract

The invention provides a polycarboxylic acids water reducer used for a high mud concrete, a structure is shown in a general formula (I), wherein, R1 and R3 is alkyl with 1-3 H or carbon atoms; R2 is alkylene with 1-20 of carbon atoms; BO is an ordered block or an disorder hybrid block formed between one or more of -C2H4O<->, -C3H6O<-> and -C4H8O<->; n is a positive integer from 10 to 120; m is a positive integer from 40 to 70; and n, x, y and z are all positive numbers. The water reducer has the advantages of simple preparation technology and good anti-soil adsorptivity. (img file='DDA00002330076300011.TIF' wi='1454' he='681' / ).

Description

technical field [0001] The invention relates to a novel water reducer, in particular to a polycarboxylate water reducer for concrete with high mud content and a preparation method thereof. Background technique [0002] The largest component of concrete is aggregate, accounting for about 75% of the volume of concrete. The mud content in concrete is basically brought in by the aggregate. Usually, the mud powder is wrapped on the surface of the aggregate, hindering the cohesion between the aggregate and the cement, forming a relatively weak interface layer, and affecting the bonding force between the cement and the aggregate in the concrete; sometimes the mud powder will gather into agglomerates and become concrete The weak area in the concrete will affect the mechanical properties and construction performance of concrete. [0003] The particles of mud are generally small, usually less than 0.05mm. The solid phase components are minerals and organic matter, accounting for hal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C08F290/06C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明田威
Owner LIAONING OXIRANCHEM INC
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