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A kind of silica modified polycarboxylate water reducing agent and preparation method thereof

A technology of white carbon black and water reducer, which is applied in the field of building materials, can solve the problems of limited application range, polycarboxylate water reducer and cement adaptability, etc., and achieve the expansion of application range, cement adaptability and application Improved range and good cement adaptability

Active Publication Date: 2017-06-09
抚顺市秀霖化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] What the present invention is to solve is the utilization of white carbon black from fly ash waste, and at the same time solves the problem of adaptability of polycarboxylate water reducer and cement and the limitation of its application range, and provides a white carbon black modified polycarboxylate Acid-based water reducer and preparation method thereof

Method used

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  • A kind of silica modified polycarboxylate water reducing agent and preparation method thereof
  • A kind of silica modified polycarboxylate water reducing agent and preparation method thereof
  • A kind of silica modified polycarboxylate water reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Add the prepared silica slurry (100 parts of silica, 800 parts of water, pH 4.7) into the reactor equipped with a condenser, stirring and liquid addition device, raise the temperature to 80±5°C, and add 10 parts of methyl Acryloyloxymethyltriethoxysilane (KH570) and 200 parts of water configuration solution (pH 4.7, T 35°C) were added dropwise into the reactor, reacted for 4.0h, and the reaction was completed, and the solvent was removed by vacuum filtration, and then Dry under vacuum at 80°C for 12 hours to obtain modified white carbon black.

[0038] Then prepare each monomer solution and initiator solution in the following parts by mass:

[0039]Monomer A solution: 100 parts of methyl butyl polyoxyethylene ether TPEG, 2.5 parts of modified silica, 2.5 parts of γ-mercaptopropionic acid, 0.5 parts of sodium sulfite and 100 parts of deionized water;

[0040] Monomer B solution: 25 parts of acrylic acid and 40 parts of deionized water;

[0041] Initiator solution: 2.0 ...

Embodiment 2

[0045] The preparation of functional white carbon black is as in Example 1.

[0046] Then prepare each monomer solution and initiator solution in the following parts by mass:

[0047] Monomer A solution: 100 parts of methyl butyl polyoxyethylene ether TPEG, 5 parts of functional silica, 2.6 parts of γ-mercaptopropionic acid, 0.52 parts of sodium sulfite and 110 parts of deionized water;

[0048] Monomer B solution: 25 parts of acrylic acid and 40 parts of deionized water;

[0049] Initiator solution: 2.08 parts of potassium persulfate and 45 parts of deionized water;

[0050] Add the monomer A solution into the reactor, raise the temperature to 55±5°C, drop the monomer B solution and the initiator solution into the reactor respectively, continue to keep warm at this temperature for 2.5h, and cool to 35°C after the reaction is completed. ℃, use 40% sodium hydroxide solution to neutralize the pH to 6-7, and filter the liquid with a 0.45 μm membrane to obtain the functional whi...

Embodiment 3

[0053] The preparation of functional white carbon black is as in Example 1.

[0054] Then prepare each monomer solution and initiator solution in the following parts by mass:

[0055] Monomer A solution: 100 parts of methyl butyl polyoxyethylene ether TPEG, 10 parts of functional silica, 2.05 parts of γ-mercaptopropionic acid, monomer B solution: 25 parts of acrylic acid and 40 parts of deionized water;

[0056] Initiator solution: 2.16 parts potassium persulfate and 50 parts deionized water;

[0057] Add the monomer A solution into the reactor, raise the temperature to 55±5°C, drop the monomer B solution and the initiator solution into the reactor respectively, continue to keep warm at this temperature for 2.5h, and cool to 35°C after the reaction is completed. °C, use 40% sodium hydroxide solution to neutralize the pH to 6-7, and filter the liquid with a 0.45 μm membrane to obtain the functional white carbon black modified polycarboxylate superplasticizer SP-3.

[0058] Th...

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Abstract

The invention discloses a white carbon black modified polycarboxylate water reducer and a preparation method thereof. Using allyl polyoxyethylene ether-like macromonomer, carboxylic acid monomer and functional silica as raw materials, the silica-modified polycarboxylate superplasticizer was prepared by free radical emulsion polymerization. The invention prepares functional white carbon black by modifying white carbon black with organic silicon coupling agent, introduces olefin group or methacryloyloxyhydrocarbyl functional group on the surface of white carbon black, and adopts functional white carbon black and polycarboxylic acid monomer to carry out copolymerization . The preparation method of the invention is environmentally friendly and easy to operate, and the prepared functional white carbon black modified polycarboxylate water reducer has high water reducing rate, good slump retention, good adaptability to cement and widened application range.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a white carbon black modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is currently the most widely used building material in the world. Concrete admixtures have promoted the rapid development of concrete. Water reducing agents are the most widely used admixtures. Polycarboxylate superplasticizer is the third-generation high-performance superplasticizer in superplasticizers, which has the advantages of low dosage and high water reducing rate. However, due to the variety of cement, complex components and sensitivity to environmental influences, polycarboxylate-based water-reducers have problems such as poor adaptability, poor dispersibility, and a decrease in cement strength. As a result, the promotion and application of water-reducers has been greatly affected limits. [0003] In order to solve the negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B24/32C08F283/06C08F220/06C08F4/40
Inventor 孟晓荣付东会王兴国
Owner 抚顺市秀霖化工有限公司
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