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Polycarboxylate water reduction agent having high heat stability modification and preparation method of polycarboxylate water reduction agent

A high thermal stability, polycarboxylic acid technology, applied in the field of water reducing agent, can solve the problems of far-flung concrete slump retention, insufficient slump retention, strong temperature sensitivity, etc., to slow down the concrete solidification rate and long acting time , The effect of simple production process

Inactive Publication Date: 2018-12-21
山西康力建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But similarly, polycarboxylate superplasticizers are highly sensitive to temperature, and the same polycarboxylate superplasticizers are constructed in different seasons, and the slump retention of concrete varies greatly; problems such as insufficient slump retention in high temperature environments

Method used

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  • Polycarboxylate water reduction agent having high heat stability modification and preparation method of polycarboxylate water reduction agent

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Effect test

Embodiment 1

[0019] Weighing: methacrylic acid 25kg, allyl polyoxyethylene ether 32kg, water-based polyurethane emulsion 40kg, hexafluorobutyl methacrylate 8kg, potassium permanganate 0.2kg, citric acid 0.5kg, aluminum isopropoxide 0.4kg , 40 kg of deionized water, 2 kg of guar gum solution with a concentration of 15%, and 1 kg of nitric acid solution with a concentration of 2%.

[0020] A preparation method of polycarboxylate water reducer with high thermal stability modification, comprising the following steps:

[0021] a) First put aluminum isopropoxide into 5kg of deionized water, after it is completely dissolved, add nitric acid solution, stir and mix for 40 minutes, then add guar gum solution, continue to stir and mix for 30 minutes, the obtained first mixture is ready for use.

[0022] b) Put the water-based polyurethane emulsion into a four-neck flask, add hexafluorobutyl methacrylate dropwise, stir and mix at high speed for 1 hour, then heat the reaction system to 55°C, react for ...

Embodiment 2

[0027] Weighing: methacrylic acid 35kg, isopentenol polyoxyethylene ether 46kg, water-based polyurethane emulsion 50kg, hexafluorobutyl methacrylate 10kg, potassium permanganate 0.5kg, H 2 o 2 -V C 1kg, 0.5kg of aluminum isopropoxide, 65kg of deionized water, 5kg of locust bean gum with a concentration of 15%, and 1kg of nitric acid solution with a concentration of 5%.

[0028] A preparation method of polycarboxylate water reducer with high thermal stability modification, comprising the following steps:

[0029] a) First put aluminum isopropoxide into 10kg of deionized water, after it is completely dissolved, add nitric acid solution, stir and mix for 50 minutes, then add locust bean gum solution, continue to stir and mix for 40 minutes, the obtained first mixture is ready for use.

[0030] b) Put the water-based polyurethane emulsion into a four-necked flask, add hexafluorobutyl methacrylate dropwise, stir and mix at high speed for 2 hours, then heat the reaction system to...

Embodiment 3

[0035] 30kg of methacrylic acid, 40kg of allyl alcohol polyoxyethylene ether, 45kg of water-based polyurethane emulsion, 9kg of hexafluorobutyl methacrylate, 0.3kg of potassium permanganate, 0.7kg of citric acid, 0.45kg of aluminum isopropoxide, deionized 60kg of water, 3kg of guar gum with a concentration of 13%, and 1kg of nitric acid solution with a concentration of 1%.

[0036] A preparation method of polycarboxylate water reducer with high thermal stability modification, comprising the following steps:

[0037] a) First put aluminum isopropoxide into 8kg of deionized water, after it is completely dissolved, add nitric acid solution, stir and mix for 45 minutes, then add guar gum with a concentration of 13%, and continue to stir and mix for 35 minutes to obtain the first mixed material spare.

[0038] b) Put the water-based polyurethane emulsion into a four-necked flask, add hexafluorobutyl methacrylate dropwise, stir and mix at high speed for 1.5h, then heat the reaction...

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Abstract

The invention discloses a polycarboxylate water reduction agent having high heat stability modification and a preparation method of the polycarboxylate water reduction agent. The raw materials of thepolycarboxylate water reduction agent mainly comprise methylpropenoic acid, unsaturated polyether, aqueous polyurethane emulsion, hexafluorobutyl methacrylate, polymer colloid of which the concentration is 10-15%, and sodium dodecyl sulfate. According to the polycarboxylate water reduction agent and the preparation method thereof disclosed by the invention, the hexafluorobutyl methacrylate is usedfor performing lyophobic modification treatment on aqueous polyurethane, and is combined with polymer colloid forming sol state to be self-assembled on the surfaces of molecule chains of polycarboxylate, and membrane layers having high dispersion and high heat resistance are formed, can enable cement to have long-time dispersion maintaining capacity, can retard concrete solidification rate of theconcrete in the transportation course, and is high in heat stability, long in action time, environmentally friendly, nonhazardous, convenient to store and transport, extensive in raw material sourcesand suitable for industrial production.

Description

technical field [0001] The invention relates to a modified polycarboxylate water reducer with high thermal stability and a preparation method thereof, belonging to the technical field of water reducers. Background technique [0002] Concrete admixtures refer to substances that are added to improve the performance of concrete before or during the mixing of concrete. Because admixtures can effectively improve the performance of concrete and have good economic benefits, they have been widely used in many countries, and their application in engineering has attracted more and more attention, becoming an indispensable material in concrete. Among them, the water reducer is the most important admixture in concrete. It can reduce the mixing water consumption and improve the concrete strength under the condition that the workability of concrete and the amount of cement remain unchanged; or under the condition that the workability and strength remain unchanged. Next, save the amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/006C08F283/065
Inventor 薛亚伟王犇
Owner 山西康力建材有限公司
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