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Polycarboxylic acid super-fluidifying agent synergist compounded composition and application thereof

A technology of compound composition and superfluidizer, which is applied in the field of concrete additives, can solve the problems of reducing coagulation acceleration and polycarboxylate coating, etc.

Inactive Publication Date: 2015-07-08
赵圣光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The mass ratio of polycarboxylic acid to alcohol amine is 1:2-10, which successfully solves the compounding problem of polycarboxylic acid superfluidizer and alcohol amine. For the coating on the surface of cement particles, at the same time, more alcohol amines are used than the usual amount, and together with polycarboxylic acid, they play the role of adsorption, coating and dispersion, reducing excessive coagulation acceleration, that is, obtaining suitable early strength unexpectedly and water reducing effect

Method used

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  • Polycarboxylic acid super-fluidifying agent synergist compounded composition and application thereof

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preparation example Construction

[0038] The preparation method of polycarboxylic acid:

[0039] Add a certain amount of water and macromonomers into the reaction kettle, stir continuously, heat the water bath to the required temperature, add the molecular weight regulator into the reaction kettle, and raise the temperature to the reaction temperature. The small molecule monomer solution is heated for 4-5 hours Dropping, the initiator solution is added dropwise in 5-6 hours, the constant temperature reaction is controlled at 2-3 hours, stop heating after the reaction is completed, and after cooling naturally to a certain temperature, add 30% potassium hydroxide to adjust the pH of the solution to 7.

[0040] In order to better coordinate with alcohol amines and reduce the gel effect caused by excessive alcohol amines, the macromonomer of the present invention can be selected from polyquaternary amine polymers.

[0041]Alternative polyquaternary polymers are: Homopolymer of N,N,N-trimethyl-2-[(2-methyl-1-oxo-2-...

specific Embodiment

[0056] Macromonomer A1:

[0057] Preparation method: Add melted methoxypolyethylene glycol (molecular weight 1200) into the reaction vessel in a reaction vessel equipped with a thermometer, a stirring device, a splitter and a condenser, and add polymerization inhibitors (without 2% of saturated acid), stabilizer, then add excess acrylic acid monomer (acid-alcohol ratio 1.5:1), catalyst (3% of the total mass of reactants), and finally add water-carrying agent (benzene, toluene or cyclohexane) , heating the system to maintain reflux. The reaction vessel can be ceramic reactor, glass reactor and stainless steel reaction device. Before the reaction, nitrogen gas is generally introduced to discharge the air in the reactor, and nitrogen gas is continuously introduced during the reaction process. The obtained macromer was designated as A1.

[0058] Macromonomer A2:

[0059] Preparation method: Add melted methoxypolyethylene glycol (molecular weight 700) into the reaction vessel in...

Embodiment 1

[0081] Polycarboxylate superfluidizer synergist compound composition, water content 55%, polycarboxylate superfluidizer B1 and triethanolamine mass ratio 1:2. Stand still for 30 days after fully mixing, and record it as polycarboxylate superfluidizer synergist compound composition D1.

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Abstract

The invention relates to the field of cement additives and provides a polycarboxylic acid super-fluidifying agent synergist compounded composition which is composed of polycarboxylic acid, alcohol amine and water, wherein the mass ratio of the polycarboxylic acid to the alcohol amine is 1:2-10 and the adding amount of the polycarboxylic acid is 0.02-0.12%. Because that the mass ratio of the polycarboxylic acid to the alcohol amine is 1:2-10, a compound problem of the polycarboxylic acid super-fluidifying agent with the alcohol amine can be solved successfully. By means of the polycarboxylic acid being less than the conventional use amount, wrapping of the polycarboxylic acid on the surface of cement granules can be reduced. By means of the alcohol amine being more than the conventional use amount, an adsorption, wrapping and dispersing effect can be achieved with combination of the polycarboxylic acid, so that excessive coagulation promotion is reduced, namely, a suitable early strength and water reduction effect can be achieved unexpectedly.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a superfluidizer and a synergist. Background technique [0002] Polycarboxylate superfluidizing agent has become a major trend in the development of superfluidizing agent because of its low dosage, high water reducing rate, good concrete fluidity and good slump performance. However, polycarboxylate superfluidizing agent There are problems in the compound use of chemical agent and synergist. The dosage of alkanolamine as a synergist is generally 0.02%-0.05%. If it exceeds 1%, it will have a coagulation-promoting effect. The dosage of polycarboxylic acid superfluidizer is generally 0.15%-2%. After compounding, the performance of the two will be reduced to varying degrees. Contents of the invention [0003] The invention provides a polycarboxylic acid superfluidizer synergist composite composition, which can improve the fluidity of cement and reduce the amount of cement under...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B28/00
Inventor 郑振永赵圣光
Owner 赵圣光
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