A hyperbranched glycoside polycarboxylate water reducer and its preparation method and application

A technology of chained glycoside polycarboxylate and water reducer, which is applied in the field of hyperbranched polycarboxylate water reducer, can solve the problems of concrete bleeding and segregation, various types of cement, poor cement adaptability, etc., and achieve high fluidity, High water reduction rate and strong adaptability

Active Publication Date: 2018-11-13
GNSG ANHUI HONG SIFANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the variety of cement varieties in our country, there are obvious regional differences. Therefore, in actual engineering applications, polycarboxylate water reducers show poor adaptability to cement, and concrete bleeding and segregation often occur in engineering. and other phenomena

Method used

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  • A hyperbranched glycoside polycarboxylate water reducer and its preparation method and application
  • A hyperbranched glycoside polycarboxylate water reducer and its preparation method and application
  • A hyperbranched glycoside polycarboxylate water reducer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Add a certain amount of methyl methacrylate (MMA) and polyethylene glycol monomethyl ether (MPEG) with a molar ratio of 3:1 into the three-necked flask of the reaction vessel, use cyclohexane as the reaction solvent, and use t-butyl as the catalyst Lithium alkoxide (the dosage is 1% of the molar weight of methyl methacrylate) and polymerization inhibitor phenothiazine (the dosage is 0.1% of the molar weight of methyl methacrylate), under the conditions of 70-80°C and air The reaction was carried out with constant stirring. After 4-5 hours of reaction, the mixed system after the reaction is distilled off under reduced pressure to remove the reaction solvent and unreacted MMA to obtain the macromonomer MAMPEG.

[0038] The infrared absorption spectrum of MAMPEG is as follows figure 1 shown, from figure 1 As can be seen in , at 1644cm -1 The place is the stretching vibration peak of olefinic double bond C=C; 945cm -1 is the out-of-plane bending vibration absorption ...

Embodiment 2

[0046] 1. Add a certain amount of methyl methacrylate (MMA) and polyethylene glycol monomethyl ether (MPEG) with a molar ratio of 3:1 into the three-necked flask of the reaction vessel, use cyclohexane as the reaction solvent, and use t-butyl as the catalyst Lithium alkoxide (the dosage is 1% of the molar weight of methyl methacrylate) and polymerization inhibitor phenothiazine (the dosage is 0.1% of the molar weight of methyl methacrylate), under the conditions of 70-80°C and air The reaction was carried out with constant stirring. React for 4 to 5 hours. After the reaction, the mixed system is distilled under reduced pressure to remove the reaction solvent and unreacted MMA, and the macromonomer MAMPEG is obtained;

[0047] 2. Add a certain amount of glycoside (GC) and solvent N,N'-dimethylformamide (DMF) into the three-necked flask of the reaction vessel, and slowly dissolve the excess acryloyl chloride dissolved in DMF under the condition of an ice-water bath. Add it drop...

Embodiment 3

[0051] 1. Add a certain amount of methyl methacrylate (MMA) and polyethylene glycol monomethyl ether (MPEG) with a molar ratio of 3:1 into the three-necked flask of the reaction vessel, use cyclohexane as the reaction solvent, and use t-butyl as the catalyst Lithium alkoxide (the dosage is 1% of the molar weight of methyl methacrylate) and polymerization inhibitor phenothiazine (the dosage is 0.1% of the molar weight of methyl methacrylate), under the conditions of 70-80°C and air The reaction was carried out with constant stirring. React for 4 to 5 hours. After the reaction, the mixed system is distilled under reduced pressure to remove the reaction solvent and unreacted MMA, and the macromonomer MAMPEG is obtained;

[0052] 2. Add a certain amount of glycoside (GC) and solvent N,N'-dimethylformamide (DMF) into the three-necked flask of the reaction vessel, and slowly dissolve the excess acryloyl chloride dissolved in DMF under the condition of an ice-water bath. Add it drop...

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Abstract

The invention relates to a polycarboxylate superplasticizer and particularly discloses a hyperbranched glucoside polycarboxylate superplasticizer. The hyperbranched glucoside polycarboxylate superplasticizer is a star polymer with natural polyhydroxylated compound glucoside serving as a nucleus and polycarboxylate linear macromolecules serving as arms. Due to less molecular entanglement and a great quantity of hydrophilic groups and high branching of a molecular structure of the hyperbranched glucoside polycarboxylate superplasticizer, solubility, cement dispersion action and cement adaptability of the hyperbranched glucoside polycarboxylate superplasticizer are greatly enhanced. In addition, the hyperbranched glucoside polycarboxylate superplasticizer is high in water reducing rate, high in cement adaptability and high in cement paste fluidity and well meets the requirement of high-performance concrete workability.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a hyperbranched polycarboxylate water reducer. Background technique [0002] At present, polycarboxylate superplasticizers are most widely used in engineering in my country, mainly because polycarboxylate superplasticizers can design their molecular structure according to the mechanism of action of cement. The polycarboxylate superplasticizer has very good dispersibility and can achieve a high plasticizing effect at a low dosage. The concrete mixed with the polycarboxylate superplasticizer has good fluidity retention, Excellent workability and durability, and wide adaptability to cement. However, due to the variety of cement varieties in our country, there are obvious regional differences. Therefore, in actual engineering applications, polycarboxylate water reducers show poor adaptability to cement, and concrete bleeding and segregation often occur in engineering. And so on. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/14C08F222/14C08F220/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F290/142C08F222/14C08F220/06C08F228/02
Inventor 宋跃锋谢中平宋红曹宗元盛锡明李秀玲
Owner GNSG ANHUI HONG SIFANG
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