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

A technology of water reducer and polycarboxylate, which is applied in the field of polycarboxylate water reducer. It can solve problems such as fluctuations in work performance, and achieve the effects of good expansion and superior slump retention performance.

Active Publication Date: 2020-09-04
CHONGQING ZHUYANG BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem that the working performance of concrete tends to fluctuate within a specific period of time, the present invention develops a composite polycarboxylate water reducer with practical value that can produce delayed dispersion on concrete within 1 hour

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add a certain amount of TPEG, modified monomer X, chain transfer agent SMAS and deionized water into a 500ml four-neck flask equipped with a stirrer, feed nitrogen gas and heat to 50°C, stir to dissolve the macromonomer completely; when the temperature rises After reaching 80°C, add AA and initiator APS dropwise at the same time, dropwise for 3 hours, and keep warm for 2 hours; after the reaction product is cooled, neutralize it with NaOH solution to obtain a modified polycarboxylate water reducer.

[0039] Wherein, the modified monomer X is The dosage of TPEG is 80g, the dosage of modified monomer X is 2g, the dosage of AA is 10g; the dosage of APS is 0.8g, and the dosage of SMAS is 0.3g.

Embodiment 2

[0041] Wherein, the modified monomer X is Others are with embodiment 1.

Embodiment 3

[0043] Wherein, the modified monomer X is Others are with embodiment 1.

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Abstract

The invention relates to a modified polycarboxylate water reducer and a preparation method thereof. Isoprenol polyoxyethylene ether (TPEG), acrylic acid (AA) and modification monomer X are taken as monomers, and under the action of an initiator and a chain transfer agent, direct polymerization is performed to prepare the composite polycarboxylate water reducer which reduces water and retains slump. The modified polycarboxylate water reducer provided by the invention can be independently used or mixed with other water reducers for use, has an excellent slump retaining performance and good expansibility when the water reducer is used in concrete, has a dispersion delay effect on the concrete in an hour, and has a comprehensive performance exceeding the performances of existing products in the market.

Description

technical field [0001] The present invention relates to polycarboxylate water reducer. Background technique [0002] The function of high water-reducing polycarboxylate superplasticizer is to generate adsorption on the surface of cement, fly ash and other powder particles at the beginning of concrete mixing to produce dispersion and improve the working performance of concrete. The action time is generally 0 -20min. The high slump polycarboxylate superplasticizer is just the opposite. It does not produce adsorption under the initial conditions. During the cement hydration process, it gradually produces adsorption through slow release, thereby improving the later work performance of concrete. The time for the agent to disperse is generally 1-3 hours after concrete mixing. In engineering applications, it is generally necessary to improve the workability and workability of concrete through the combination of high water-reducing and high-slump polycarboxylate water-reducing age...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/54C08F220/14C08F220/34C08F220/58C04B24/26C04B24/16C04B103/30
Inventor 马清浩
Owner CHONGQING ZHUYANG BUILDING MATERIAL CO LTD
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