Method for preparing polycarboxylate superplasticizer

A technology of water reducer and polycarboxylate, which is applied in the field of preparation of polycarboxylate water reducer, can solve problems such as inconvenience, achieve the effects of reducing production cost, simplifying process and production equipment, and eliminating the discharge of three wastes

Inactive Publication Date: 2017-05-10
湖北江城子建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This shows that the preparation method of above-mentioned existing polycarboxylate superplasticizer obviously still has inconvenience and defect, and urgently needs to be further improved

Method used

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  • Method for preparing polycarboxylate superplasticizer
  • Method for preparing polycarboxylate superplasticizer

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preparation example Construction

[0024] The main steps of the preparation method of polycarboxylate water reducer of the present invention are:

[0025] Firstly, isopentenol polyoxyethylene ether is dissolved in tap water to form a polyether solution with a mass concentration of 40-55%. Prenyl alcohol polyoxyethylene ether with a molecular weight of 2000-3000 is suitable for use in the present invention.

[0026] Next, add coagent, stir evenly and then add oxidant. Among them, the coagent used in the present invention is preferably methacrylic acid, and the mass ratio of the added amount to prenol polyoxyethylene ether is 1-5%. In the self-made active auxiliary agent of the present invention. The oxidant can be hydrogen peroxide, ammonium persulfate, sodium persulfate or a mixture of several, and the amount of oxidant added accounts for 1-3% of the mass of prenol polyoxyethylene ether.

[0027] Again, a mixed aqueous solution of an aqueous acrylic acid solution, a chain transfer agent, and a reducing agent...

Embodiment 1

[0033] Add 271kg of common tap water to the reactor, and then add 250kg of prenol polyoxyethylene ether (TPEG) with a molecular weight of 2400 under stirring, and add 12.5kg of coagent methacrylic acid after it is completely dissolved. After stirring evenly, add 7.4kg of 28% hydrogen peroxide, and after stirring for 10 minutes, measure the temperature of the bottom material to be 3°C, and start to add dropwise the aqueous solution prepared by 40.2kg of acrylic acid and 80kg of tap water. The mixing solution was added dropwise for 3 hours and 3.5 hours respectively. After the dropwise addition was completed, the temperature was kept for 1 hour. After the reaction was completed, the pH value of the product was adjusted to 7 with 32% sodium hydroxide solution, and the obtained product was ultra-low temperature Polycarboxylate superplasticizer produced from tap water.

Embodiment 2

[0035] Add 820Kg of ordinary tap water into the reaction kettle, and then add 550kg of prenol polyoxyethylene ether with a molecular weight of 2000 under stirring, and add 16kg of methacrylic acid after it is completely dissolved. After stirring evenly, add 8.25kg of 28% hydrogen peroxide, and after stirring for 10 minutes, measure the temperature of the bottom material to be 10°C, and start to add dropwise the aqueous solution prepared by 89.5kg of acrylic acid and 175kg of tap water. The mixing solution was added dropwise for 3 hours and 3.5 hours respectively. After the dropwise addition was completed, the temperature was kept for 1 hour. After the reaction was completed, the pH value of the product was adjusted to 6 with 32% sodium hydroxide solution, and the obtained product was low temperature Polycarboxylate superplasticizer produced from tap water.

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Abstract

The invention relates to a method for preparing a polycarboxylate superplasticizer. The method comprises the following steps: dissolving isopentenol polyoxyethylene ether in running water so as to form a polyether solution with the mass concentration of 40-55%; adding an active aid, uniformly stirring, and adding an oxidant; dropwise adding acrylic acid aqueous solution and a mixed aqueous solution of a chain transfer agent and a reducing agent; regulating the pH value of the system, wherein the molar ratio of the isopentenol polyoxyethylene ether to the acrylic acid is 1:(3.1-7), the addition amount of the active aid accounts for 1-5% of the mass of the isopentenol polyoxyethylene ether, the addition amount of the chain transfer agent accounts for 0.05-1.5% of the mass of the isopentenol polyoxyethylene ether, the addition amount of the oxidant accounts for 1-3% of the mass of the isopentenol polyoxyethylene ether, and the addition amount of the reducing agent accounts for 0.06-0.8% of the mass of the isopentenol polyoxyethylene ether. The method disclosed by the invention is simple in process, convenient to operate, low in cost and suitable for normal temperature production, and the defects of the preparation method of the existing polycarboxylate superplasticizer are overcome.

Description

technical field [0001] The invention relates to a preparation method of a polycarboxylate water reducer, in particular to a method for synthesizing a polycarboxylate water reducer at low temperature using tap water. Background technique [0002] Polycarboxylate superplasticizer is a kind of graft copolymer containing carboxyl group in the molecule, and the special molecular structure of "comb" is formed by polyoxyethylene. It has low dosage, high water reducing rate, no segregation, slump It is the third-generation high-performance water reducer developed after wood calcium and naphthalene-based ordinary water reducers and high-efficiency water reducers. With the rise of my country's water conservancy, bridges, nuclear power, tunnels, railways and other infrastructure, polycarboxylate water reducers have been used more and more. [0003] At present, the polyether raw materials for the production of polycarboxylate superplasticizers are mainly polyethylene glycol methyl ethe...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F2/38C08F4/40C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B2103/302C08F2/38C08F4/40
Inventor 汪金方刘天德吴求振张园
Owner 湖北江城子建材科技有限公司
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