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Preparation method of concrete water reducer

A technology of concrete water reducing agent and solvent, which is applied in the field of preparation of concrete additives, can solve the problems of difficult control of cement adaptability, poor cement adaptability, and large difference in cement performance.

Inactive Publication Date: 2012-03-14
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the polycarboxylate superplasticizer greatly improves the concrete strength, compactness, corrosion resistance, impermeability and greatly improves the project life, it also exposes many weaknesses, such as poor adaptability to sand and gravel and cement from different manufacturers, Sensitive to mud content, dosage control needs to be very accurate, etc., which brings a lot of troubles to users
In particular, there are different types and models of cement in China at present, such as slag Portland cement (referred to as slag cement, code-named PS), pozzolan cement (code-named PP) and fly ash Portland cement (referred to as fly ash cement, code-named PF). ), etc., due to the different mixtures mixed into the cement, the performance of the cement is quite different, and sometimes even mixed with the mixture that does not meet the requirements, making it difficult to control the adaptability of the cement

Method used

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  • Preparation method of concrete water reducer
  • Preparation method of concrete water reducer

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preparation example Construction

[0018] The invention provides a method for preparing a concrete water-reducing agent. The ester-type unsaturated monomer and the ether-type unsaturated monomer are organically combined by means of copolymerization, thereby preparing a water-reducing agent with good adaptability. The preparation method is as follows:

[0019] Step 1, unsaturated organic acid is esterified with MPEG to obtain MPEG unsaturated organic acid ester (or MPEG unsaturated organic acid ester and unsaturated organic acid (salt) mixture); wherein, the MPEG molecular weight is preferably 500-2500 ; The unsaturated organic acid is preferably acrylic acid.

[0020] Step 2, adding the unsaturated alcohol polyether into the solvent, heating and dissolving; preferably, the structural formula of the unsaturated alcohol polyether is:

[0021]

[0022] Among them, R 1 , R 2 , R 3 Alkyl or hydrogen atom; R 4 is a hydrogen atom or C 1 ~C 20 Hydrocarbyl; R Y for C 2 ~C 18 Alkenyl; n is a natural number f...

Embodiment 1

[0030] Put 600 parts of MPEG1200, 245 parts of acrylic acid, 1 part of hydroquinone, and 1.5 parts of concentrated sulfuric acid into a flask with a stirring and heating device as a catalyst, heat up to 110°C and keep warm for 10 hours for esterification, then cool down to 50°C and add 30 parts Triethanolamine, 110 parts of water and 110 parts of 30% aqueous caustic soda, neutralized for 20 minutes. MPEG acrylate and acrylate mixtures were obtained.

[0031] In a flask equipped with a stirring and heating device, 220 parts of bottom water and 225 parts of isobutenol polyoxyethylene (50) ether were added, and the temperature was raised to dissolve. Raise the temperature to 50±2°C and add 0.8 parts of ammonium persulfate. At the same time, 250 parts of MPEG acrylate and acrylate mixture were added dropwise; 65 parts of an aqueous solution containing 0.5 parts of mercaptopropionic acid, 0.1 octyl mercaptan, and 0.5 parts of sodium formaldehyde sulfoxylate. Control 2.5 hours to ...

Embodiment 2

[0033] In a flask with a stirring and heating device, 218 parts of bottom water and 245 parts of isobutenol polyoxyethylene (25) ether were added, and the temperature was raised to dissolve. Heat up to 55±2°C and add 1 part of hydrogen peroxide (35%). At the same time, 226 parts of MPEG acrylate and acrylate mixture of Example 1, 67 parts of aqueous solution containing 0.4 part of mercaptopropionic acid, 0.1 octyl mercaptan, and 0.3 part of sodium formaldehyde sulfoxylate were added dropwise. Control 2.5 hours to drop. Then add 30 parts of 1% ammonium persulfate aqueous solution dropwise within 0.5 hour, and continue to heat-preserve and ripen for 0.5 hour after dropping. Properly lower the temperature and add 30% lye to neutralize for 10 minutes, then discharge. A polycarboxylate water reducer copolymerized with ether ester is obtained.

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Abstract

The invention provides a preparation method of a concrete water reducer, comprising the following steps: 1) letting MPEG and unsaturated acid be subject to esterification to obtain a mixture of MPEG unsaturated fatty acid and unsaturated acid (salt); 2) dissolving nonsaturated polyether; 3) adding an initiator, and adding the mixture of MPEG unsaturated fatty acid and unsaturated acid (salt), a chain transferring agent and a promoter dropwisely; and 4) keeping warm and aging, neutralizing with alkali, and discharging. By using a copolymerization method to copolymerize the ester unsaturated monomer and the ether unsaturated monomer, the water reducer with good adaptability is prepared.

Description

technical field [0001] The invention relates to a preparation method of a concrete additive, in particular to a preparation method of a concrete water reducer. Background technique [0002] Concrete water reducer refers to an admixture that can reduce the amount of mixing water and improve the strength of concrete under the condition that the workability of concrete and the amount of cement remain unchanged; through surface activity, complexation, electrostatic repulsion or three-dimensional repulsion, etc. To hinder or destroy the flocculation structure of cement particles, so as to save the amount of cement while ensuring the workability and strength of concrete. [0003] Traditional water reducing agents can be divided into lignosulfonic acids, polycyclic aromatic salts and water-soluble resin sulfonic acids according to the composition materials. Water reducer, polycyclic aromatic hydrocarbon sulfonate polymer concrete water reducer disclosed in patent CN101007719, alip...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G65/48C04B24/26C04B103/30
Inventor 方剑
Owner SHANGHAI TAIJIE CHEM
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