Early-strength functional monomer and preparation method thereof, and early-strength polycarboxylate superplasticizer and preparation method thereof

A technology of functional monomers and polycarboxylic acids, applied in the field of concrete admixtures, can solve problems such as limited early strength effect, increased heat release of cement, increased concrete viscosity, etc., and is conducive to promotion and popularization, and improved hydration rate , Improve the effect of early strength

Active Publication Date: 2021-08-13
北京金隅节能科技有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the water-binder ratio will increase the viscosity of concrete, and increasing the amount of cement will increase the heat release of cement and increase the risk of cracking of components. , it is easy to introduce chloride ions, which will cause corrosion of steel bars and cause salt precipitation and frost on the concrete surface. In addition, some inorganic salts have poor compati...

Method used

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  • Early-strength functional monomer and preparation method thereof, and early-strength polycarboxylate superplasticizer and preparation method thereof
  • Early-strength functional monomer and preparation method thereof, and early-strength polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of the early-strength polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0038] (1) Synthesis of early-strength functional monomers:

[0039] In a four-necked flask with a stirrer, a thermometer, and a reflux condenser, add 129 g of prenyl alcohol, then add 277 g of 4-aminophenylazobenzene-3-sulfonic acid, and stir evenly to make the two raw materials Fully blend, then add 12.18g of p-toluenesulfonic acid and 3.25g of hydroquinone into the reaction vessel, slowly raise the temperature to 100°C while stirring, carry out reflux reaction for 7.5h, and cool down to 40°C after the reaction. Neutralize with sodium bicarbonate solution until the liquid is neutral, extract with water for 3 times, recover the organic phase, dry with anhydrous sodium sulfate for 12 hours, filter off the solvent, then distill until there is no liquid and continue to drop at the condenser. The ester early-strength ...

Embodiment 2

[0044] The preparation method of the early-strength polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0045] (1) Synthesis of early-strength functional monomers:

[0046] In a four-necked flask with stirrer, thermometer, and reflux condenser, add 115g of isobutenol, then add 257g of 5-[(4-aminophenyl) azo]-2-hydroxybenzoic acid, stir well, make The two raw materials are fully fused, and then 10.42g of phosphoric acid and 2.23g of phenothiazine are added to the reaction vessel, and the temperature is slowly raised to 100°C while stirring, and the reflux reaction is carried out for 6 hours. The sodium solution is neutralized until the liquid is neutral, extracted with water for 3 times, the organic phase is recovered, dried with anhydrous sodium sulfate for 12 hours, and the solvent is filtered off, and then distilled until there is no liquid, continue to drop at the condenser tube, and the distilling bottle The este...

Embodiment 3

[0051] The preparation method of the early-strength polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0052] (1) Synthesis of early-strength functional monomers:

[0053] In a four-necked flask with stirrer, thermometer, and reflux condenser, add 170g of 4-methyl-4-pentenol, then add 307g of 3-[(4-amino-3-methoxyphenyl) Azo]-benzenesulfonic acid, stir evenly, make two kinds of raw materials fully blend, then add the toluenesulfonic acid of 13.34g and the tert-butylcatechol of 3.82g in the reaction container, slowly heat up to 100 while stirring ℃, carry out reflux reaction for 7.5h, after the reaction is completed, cool down to 40°C, neutralize with sodium bicarbonate solution until the liquid is neutral, recover the organic phase, dry with anhydrous sodium sulfate for 12h, filter off the solvent, and then carry out distillation. Distill until there is no liquid and continue to drop at the condenser, and the ester ...

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Abstract

The invention discloses an early-strength functional monomer and a preparation method thereof, and an early-strength polycarboxylate superplasticizer and a preparation method thereof. The early strength functional monomer is prepared by the following steps: (1) adding an aminoazo compound and unsaturated alcohol into a reaction container in proportion, and stirring until the azo compound is completely dissolved; (2) adding a polymerization inhibitor and a catalyst into the reaction container, gradually heating to 100 DEG C, and carrying out reflux reaction for 5-8 hours; and (3) after the reaction is finished, cooling to 40 DEG C, neutralizing with a sodium bicarbonate solution until the liquid is neutral, extracting with water three times, recovering an organic phase, drying with anhydrous sodium sulfate for 12 hours, filtering, and distilling to obtain the ester early strength functional monomer. The early-strength polycarboxylate superplasticizer containing the early-strength functional monomer can remarkably improve the early strength of concrete without influencing the later strength in a normal environment, can reduce the viscosity of the concrete and improve the water retention property of the concrete, and is wide in application range and beneficial to popularization.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and more specifically relates to an early-strength functional monomer, an early-strength polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] With the adjustment of the national housing industrialization policy, the introduction of the concept of green development and the deepening of the sustainable development strategy, the development trend of the industry will gradually shift from ready-mixed concrete to construction industrialization and concrete prefabricated components. Concrete prefabricated components require concrete to have good workability, which can meet the construction needs of prefabricated components, and also need to have early strength performance, which can improve the turnover rate of formwork, speed up construction progress, and improve production efficiency. The means to improve the early strength performance of component...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F230/08C08F220/34C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F230/085C08F220/34
Inventor 张业明张露瑶王晓英田静罗紫隆陈凤琪高峰孙丽丽石龙飞王高强王立彬王思远张全贵王付刚
Owner 北京金隅节能科技有限公司
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