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Early-strengthening polycarboxylate water reducer and preparation method thereof

A polycarboxylic acid and early-strength type technology, which is applied in the field of early-strength polycarboxylate water reducer and its preparation, can solve problems such as difficult molecular weight, product performance decline, and building structure damage, and achieve good steric hindrance effect, Accelerates cement hydration and has good workability

Active Publication Date: 2015-05-20
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively low activity of allyl polyoxyethylene ether, after the completion of the polymerization reaction, some residues will remain in the polymerization solution, which will adversely affect the water-reducing performance of the final polymer and the performance of concrete.
[0007] Patent CN101376576B provides an early-strength polycarboxylic acid-based high-performance water reducer and its preparation process. The invention uses two types of polyethylene glycol monoether acrylate macromonomers with different chain numbers, (methyl) Acrylic acid, sodium allyl sulfonate or sodium methacrylic acid sulfonate, and polyether acrylate monomers are under nitrogen protection conditions, and the copolymerization reaction is carried out by feeding in one time, because (meth)acrylic acid and other monomers have strong activity , easy to self-polymerize, affect the copolymerization effect between monomers, and the molecular weight is difficult to control, resulting in a decrease in the performance of the product
[0008] To sum up, the existing polycarboxylate water reducer, or the introduction of corrosive substances will cause damage to the applied building structure, or the type and amount of polymerized monomers are improperly selected, resulting in polycarboxylate water reducers. Agents cannot achieve good results during use

Method used

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  • Early-strengthening polycarboxylate water reducer and preparation method thereof
  • Early-strengthening polycarboxylate water reducer and preparation method thereof
  • Early-strengthening polycarboxylate water reducer and preparation method thereof

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preparation example Construction

[0042] The preparation method of the early-strength polycarboxylate water reducer includes adding the four monomers, initiators and chain transfer agents into a solvent, and preparing the copolymer through solution polymerization.

[0043] In one embodiment of the present invention, the solvent is water; temperature is the most critical step in the polymerization reaction and plays an important role in the chain initiation reaction. When the temperature is low, the polymerization reaction is difficult to carry out, and if the temperature is too high, side reactions are likely to occur. The temperature selected in the present invention is between 60° C. and 80° C., and the formation of reaction products can be better controlled within this range.

[0044] Whether the polycarboxylate superplasticizer structure copolymerizes well is related to the feeding method. The polymerization method is one of the important factors affecting the uniformity of the product structure. Different...

Embodiment 1

[0053] In the reactor, add 190 grams of water and 270 grams of monomer A (methoxy polyethylene glycol acrylate, n=52), 40.5 grams of monomer B (allyl polyoxyethylene ether, m=28), 10.13 grams of monomer D (2-acrylamido-2 methylpropanesulfonic acid), stirring and heating to 65 ° C, after the above three monomers are dissolved, add 16.88 grams of monomer C (acrylic acid), and then add the initiator dropwise (the mixture of 3.38 grams of ammonium persulfate and 40 grams of water), chain transfer agent (the mixture of 0.68 grams of mercaptoacetic acid and 68 grams of water), was added dropwise at a uniform speed for 4 hours respectively, and the aging time was 2 hours. After the reaction finished, the temperature of the system was lowered to normal temperature, adjust the pH value of the reaction mixture to neutrality with a NaOH aqueous solution with a mass concentration of 30%, and discharge the material to obtain the high-performance polycarboxylate water reducer product ZPC-1. ...

Embodiment 2

[0055] In the reactor, add 190 grams of water and 236.3 grams of monomer A (methoxypolyethylene glycol acrylate, n=30), 60.75 grams of monomer B (methallyl polyoxyethylene ether, m=28 ), 10.13 grams of monomer D (2-acrylamido-2 methylpropanesulfonic acid), stirred and heated to 60 ° C, after the above three monomers were dissolved, 30.39 grams of monomer C (acrylic acid) was added, and then added dropwise to trigger Agent (4.05 grams of ammonium persulfate and 48 grams of water mixture), chain transfer agent (1.01 grams of mercaptoacetic acid and 50.5 grams of water mixture), was added dropwise at a constant speed for 3 hours respectively, and the aging time was 2 hours. After the reaction, the temperature of the system was reduced to At room temperature, adjust the pH value of the reaction mixture to neutral with a NaOH aqueous solution with a mass concentration of 30%, and discharge the material to obtain the high-performance polycarboxylate water reducer product ZPC-2. The s...

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Abstract

The invention provides an early-strengthening polycarboxylate water reducer, which comprises a copolymer formed by polymerization of four monomers. The invention also provides a preparation method of the early-strengthening polycarboxylate water reducer. The early-strengthening polycarboxylate water reducer provided in the invention acts on aggregate such as cement and can provide a better steric-hindrance effect. By using the early-strengthening polycarboxylate water reducer provided by the invention, concrete is enabled to have good workability, and is prevented from phenomena of bleeding and segregation.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the development of concrete in my country in recent years, the performance of concrete in all aspects has been continuously improved, and the requirements for concrete water reducing agents are also getting higher and higher. Water reducer is an important concrete admixture. According to its water reducing rate, it can be divided into ordinary water reducer (represented by lignosulfonate), high-efficiency water reducer (including naphthalene, melamine, etc.) series, sulfamate series, aliphatic series, etc.) and high-performance water reducers (represented by polycarboxylic acid series high-performance water reducers). [0003] Polycarboxylate superplasticizer is an admixture based on carboxylic acid graft polymer, which is generally produced by copolymerizing polyether macr...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/58C08F220/06C08F2/38C04B24/16C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明刘晓杰
Owner LIAONING OXIRANCHEM INC
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