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Viscosity reduction-type polycarboxylate water-reducer and preparation method thereof

A viscous polycarboxylate and water-reducing agent technology, applied in the field of construction admixtures, can solve problems such as limited slump retention capacity, inability to achieve low-temperature energy saving, inability to achieve high-strength concrete, etc., to improve construction performance, facilitate production, reduce The effect of high water rate

Inactive Publication Date: 2017-03-01
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is actually applied to high-strength concrete with low water-binder ratio, its effect is similar to that of polycarboxylate superplasticizers branched with polyethylene glycol monomethyl ether methacrylate, and it cannot be hydrolyzed well. The slump and fluidity are maintained; at the same time, due to the limited slump retention ability of methallyl polyoxyethylene ether, this product cannot really meet the requirements of high-strength concrete that needs to have excellent flow properties; and due to the double bond of raw materials Because of the activity and the initiation system, the temperature required for the polymerization reaction is also high, and it is impossible to achieve low temperature energy saving

Method used

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  • Viscosity reduction-type polycarboxylate water-reducer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) 100 parts of 3-methyl-3-butene-1-polyoxyethylene ether, 300 parts of maleic anhydride and water are added to the reactor, stirred to dissolve;

[0026] (2) At 30-40°C, add 2 parts of hydrogen peroxide solution at one time to the material obtained in step (1), and stir;

[0027] (3) 0.2 parts of 1,4-cyclohexanedimethanol diacrylate, 0.05 parts of phosphate di(hydroxyethyl acrylate) and 2 parts of thioglycolic acid were added dropwise to the material obtained in step (2). Mix the solution and 1 part of the aqueous solution of ascorbic acid, drop it in 2-4 hours, after the dropwise addition, ripen for 1 hour, and finally, add the aqueous solution of sodium hydroxide (32%) to neutralize it, and obtain the weight average molecular weight of 31000 Viscosity-reducing polycarboxylate superplasticizer (50%).

Embodiment 2

[0029] (1) Add 100 parts of allyl polyoxyethylene ether, 300 parts of itaconic anhydride and water into the reactor, stir to dissolve it;

[0030] (2) At 30-40°C, add 4 parts of ammonium persulfate solution at one time to the material obtained in step (1), and stir;

[0031] (3) 0.3 parts of 1,4-butanediol diacrylate, 0.1 parts of hydrogen phosphate bis(methacryloyloxyethyl) ester and 3 parts of 3 -Mixed solution of mercaptopropionic acid and 1.5 parts of sodium sulfite aqueous solution, dripping over 2 to 4 hours, aging for 1 hour after the addition, and finally, adding sodium hydroxide aqueous solution (32%) to neutralize to obtain the described A viscosity-reducing polycarboxylate superplasticizer (50%) with a weight-average molecular weight of 42,500.

Embodiment 3

[0033] (1) 100 parts of 2-methallyl polyoxyethylene ether, 300 parts of citric anhydride and water are added to the reactor, stirred to dissolve;

[0034] (2) At 30-40°C, add 5 parts of sodium persulfate solution at one time to the material obtained in step (1), and stir;

[0035] (3) Add dropwise a mixture of 0.5 parts of neopentyl glycol diacrylate, 0.15 parts of hydrogen phosphate di(methacryloyloxyethyl) ester and 4 parts of mercaptoethanol in the material obtained in step (2). Solution and the aqueous solution of 2 parts of sodium hypophosphite, dripped in 2~4h, after dropping, aging 1h, finally, add the aqueous solution (32%) of sodium hydroxide, make it neutralize, promptly obtain described weight-average molecular weight of 50300 viscosity-reducing polycarboxylate superplasticizer (50%).

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Abstract

The invention discloses a viscosity reduction-type polycarboxylate water-reducer and a preparation method thereof. The viscosity reduction-type polycarboxylate water-reducer is prepared by a nonsaturated polyether monomer, a nonsaturated acid anhydride monomer, a bifunctional nonsaturated carboxylate monomer and a nonsaturated phosphate ester monomer with mol ratio of 1:3:0.05-0.5:0.05-0.2 through an aqueous free radical copolymerization reaction. The viscosity reduction-type polycarboxylate water-reducer has the advantages of high water-reducing rate and slump retaining performance, can effectively reduce the concrete viscosity, improves concrete workability, materials softness, and fast flow velocity, and can improve the concrete construction performance.

Description

technical field [0001] The technical field of the construction admixture of the present invention particularly relates to a viscosity-reducing polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] With the continuous expansion of the scale of civil engineering and the continuous improvement of the level of science and technology, some important buildings with high-rise large-span and special functional requirements continue to appear, such as skyscrapers, super-long-span bridges and giant water conservancy projects. High strength, better durability, and better stability, these demands have led to the gradual development of concrete from ordinary to high performance and even ultra-high performance. The improvement of concrete strength is mainly achieved by reducing the water-binder ratio, which also leads to higher viscosity of concrete, causing a series of construction problems such as concrete mixing, transportation, and pumping, whic...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/06C08F222/14C08F230/02C08F4/40C08F2/38C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F2/38C08F4/40C08F283/065C08F222/06
Inventor 柯余良方云辉张小芳李格丽林倩林添兴尹键丽
Owner KZJ NEW MATERIALS GROUP CO LTD
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