Preparation method of star polycarboxylic acid high-performance water reducing agent

A high-performance, polycarboxylate technology, applied in the field of polycarboxylate high-performance water reducer, to achieve the effect of improving work efficiency, low energy consumption, and expanding theoretical connotation

Active Publication Date: 2013-01-23
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is required that the synthesized polycarboxylate-based high-performance water reducer should not only change the traditional comb-shaped structure into a high-efficiency star-shaped structure, so as to achieve further excellent working performance, but also ensure simple process operation and Low preparation cost, easy to industrialized production, related work in this area has not been reported at home and abroad

Method used

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  • Preparation method of star polycarboxylic acid high-performance water reducing agent
  • Preparation method of star polycarboxylic acid high-performance water reducing agent
  • Preparation method of star polycarboxylic acid high-performance water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, 20.13g of trimethylolpropane was added to the reactor, the temperature was raised to 40°C, 0.02g of hydroquinone methyl ether, 38.74g of methacrylic acid, and 0.88g of sulfamic acid were successively added to the reactor, and each feeding interval Stir for 20 minutes, add 17.66g of toluene when the temperature rises to 80°C, continue to raise the temperature to 150°C for esterification reaction, separate the water obtained during the reaction, and remove the water-carrying agent by vacuuming after 2 hours of reaction , to obtain the esterification reaction product; take 0.23g of the esterification reaction product and add it to the reactor, then add 72.97g of water, raise the temperature to 50°C and stir for 30 minutes until it is evenly mixed, then add 50g of allyl polyoxygen to the reactor in turn Vinyl ether (molecular weight = 500), 0.46g mercaptoacetic acid, 10.81g acrylic acid, 3.8g initiator ammonium persulfate solution with a mass fraction of 30%, and the ...

Embodiment 2

[0027] After the polycarboxylate superplasticizer with a concentration of 40% obtained in Example 1 was stored at 6°C for 30 days, its implementation effect was measured.

Embodiment 3

[0029] First, 10.93g of mannitol was added to the reactor, the temperature was raised to 80°C, 2.16g of hydroquinone, 43.24g of acrylic acid, and 5.42g of p-toluenesulfonic acid were successively added to the reactor, and the stirring time between each addition was 5 minutes. When the temperature rises to 100°C, add 16.25g of cyclohexane, and continue to heat up to 140°C for esterification reaction. During the reaction, the water obtained from the reaction is separated out. After 3 hours of reaction, the water-carrying agent is removed by vacuuming to obtain the ester reaction product; take 0.53g esterification reaction product and join in the reactor, add 51.75g ​​water again, raise the temperature to 65 ℃ and stir for 10 minutes until it is mixed evenly, add 60g isobutenyl polyoxyethylene ether (molecular weight =3000), 3.04g n-dodecyl mercaptan, 0.6g acrylic acid and 4.09g maleic anhydride mixture, 142.87g mass fraction is 1% initiator ammonium persulfate solution, and the s...

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Abstract

The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.

Description

technical field [0001] The present invention relates to the technical field of a polycarboxylate high-performance water reducer for cement concrete, in particular to a polycarboxylate superplasticizer with a star structure synthesized by esterification of polyols and acrylic monomers to generate active cores and then copolymerized. The specific preparation method of performance water reducer. Background technique [0002] In recent years, with the rapid development of the construction industry and the continuous improvement of the design level, people have put forward higher requirements for cement admixtures. In the past ten years, new technologies such as large formwork, slip form, pumped concrete, vacuum water-absorbing concrete, and shotcrete have appeared in the field of construction; in the supply of concrete, methods such as commercial concrete and centralized mixing have emerged; There are high-rise, super high-rise, long-span, folded plate, thin shell, frame light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/20C08F220/06C08F222/06C08F222/02C08F228/02C04B24/26C04B24/16C04B103/30
CPCC04B24/16C08F290/06C04B24/26C08F220/06C04B24/2647C04B2103/32C04B2103/308C08F283/01C04B24/2641
Inventor 刘晓王子明朱洁林韦兰寇雅仑李慧群路芳
Owner GUIZHOU DR SHI TECH
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