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Water-plastic retaining polycarboxylic acid water reducer and method for preparing same

A technology of polycarboxylate and water reducing agent, which is applied in the field of cement dispersants, can solve the problems of bleeding, segregation, slump, rapid loss, etc., and achieve the effects of reducing operating strength, ensuring safety, and good water retention and plasticity

Active Publication Date: 2012-06-06
山东华伟银凯建材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a water-retaining and plastic-retaining polycarboxylate water-reducer and its preparation method. A new type of polycarboxylate-based water-reducer is synthesized by applying water-retaining and plastic-retaining BBEG and small monomers , aiming to solve the problems of bleeding segregation and rapid loss of slump when mixing concrete

Method used

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  • Water-plastic retaining polycarboxylic acid water reducer and method for preparing same
  • Water-plastic retaining polycarboxylic acid water reducer and method for preparing same
  • Water-plastic retaining polycarboxylic acid water reducer and method for preparing same

Examples

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Effect test

example example 1

[0033] The molar ratio of macromonomer (a-1) to macromonomer (b-1) is 1: 4, BBEG: AA: NMA=1: 2.5: 0.1 (molar ratio), and the initiation system is (NH 4 ) 2 S 2 o 8 : NaHSO 3 =1:0.4 (weight ratio), (NH 4 ) 2 S 2 o 8 The dosage is 0.8% of the total mass of the monomers, which is formulated into a 1.0% aqueous solution (mass concentration), and the dosage of SA is 0.6% of the monomers. .

[0034] Combine BBEG and NaHSO 3 Put it into the bottom water in advance and start to heat up. Make AA, NMA, SA and a certain amount of water into a 55% aqueous solution as material A, and the initiator (NH 4 ) 2 S 2 o 8 The solution is material B. When the temperature of the bottom liquid rises to 70-85°C, start to add material A and material B with a metering pump, and the material A will drop in 2.5 hours, and the material B will be added in 3.0 hours. After adding material A, keep it at this temperature for 1 hour, lower it to 40-50°C, neutralize it with 30% NaOH to pH=6-8, an...

example example 2

[0036] The molar ratio of macromonomer (a-2) to macromonomer (b-1) is 1:6, BBEG:MAA:NMA=1:3:0.3 (molar ratio). The initiator system is (NH 4 ) 2 S 2 o 8 : NaHSO 3 =1:0.6 (weight ratio), NH4S 2 o 8 The dosage is 1.2% of the total mass of the monomers, which is formulated into a 1.0% aqueous solution (mass concentration), and the dosage of SA is 0.6% of the monomers. .

[0037] Combine BBEG with NaHSO 3 Put it into the bottom water in advance and start to heat up. MAA, NMA, SA and a certain amount of water are made into 55% aqueous solution (mass concentration) as A material, and initiator ammonium persulfate solution is used as B material. When the bottom water rises to 70-85°C, start feeding material A and material B with a metering pump. Add material A in 2.5 hours, add material B in 3.0 hours, and keep warm at the temperature for 1 hour after adding material B. Lower the temperature to 40-50°C, neutralize with 30% NaOH to pH = 6-8, and obtain the polycarboxylate w...

example example 3

[0039] The molar ratio of macromonomer (a-3) to macromonomer (b-2) is 1:8, BBEG:MAA:AA:NMA=1:2:1:1 (molar ratio). The initiator system is (NH 4 ) 2 S 2 o 8 : NaHSO 3 =1:0.4 (weight ratio), (NH 4 ) 2 S 2 o 8 The dosage is 1.5% of the total mass of the monomer, and it is made into a 1.0% aqueous solution; the dosage of SA is 0.3% of the monomer dosage.

[0040] Combine BBEG with NaHSO 3 Put it into the bottom water in advance and start to heat up. Make MAA, NMA, SA and a certain amount of water into a 55% aqueous solution as A material, and use the initiator ammonium persulfate solution as B material. When the bottom water rises to 70-85°C, start feeding material A and material B with a metering pump. Add material A in 2.5 hours, add material B in 3.0 hours, and keep warm at the temperature for 1 hour after adding material B. Lower the temperature to 40-50°C, neutralize with 30% NaOH to pH=6-8, and obtain the polycarboxylate water reducer product. The weight ratio o...

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PUM

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Abstract

The invention provides water-plastic retaining polycarboxylic acid water reducer and a method for preparing same, belonging to the technical field of the cement dispersant. The water-plastic retaining polycarboxylic acid water reducer is characterized by being prepared in nature through copolymerizing a big water-plastic retaining monomer and a small water-plastic retaining monomer, wherein the big water-plastic retaining monomer is prepared by mixing a big ester monomer with a small ester monomer. Prepared from the big water-plastic retaining monomer, the water-plastic retaining polycarboxylic acid water reducer can well retain the water and the plastic of concrete which is prepared through stirring different cement and different aggregate, and the ubiquitous problems of the segregation due to water bleeding and the quick slump loss are effectively solved. The water is used as solvent for the polymerization reaction, which is good for the industrial production and ensures the safe and environmental-friendly production process.

Description

technical field [0001] The invention relates to a cement dispersant, in particular to a water-retaining and plastic-retaining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete admixture has been more and more widely used in concrete construction, and it is called the fifth component of concrete; its development and application have promoted the development of concrete technology, and it has become a key material for the production of high-performance concrete. [0003] The application of concrete admixture involves three industries of cement, admixture and concrete, among which the adaptability of admixture to cement and aggregate has become a common problem faced by the three industries. The adaptability of admixtures to cement and aggregates is mainly manifested in bleeding segregation and rapid slump loss during concrete mixing. [0004] The problems of bleeding segregation and rapid slump loss of freshly mixed concret...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F290/06C04B103/30
CPCC04B24/2694C04B2111/00025C04B2103/302C04B2103/30C04B2111/00017C04B24/2647C04B2103/46
Inventor 贾吉堂张明段彬王惠忠曹玉林
Owner 山东华伟银凯建材科技股份有限公司
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