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Concrete super plasticizer and preparation method thereof

A superplasticizer and concrete technology, applied in the field of superplasticizer with narrow molecular weight distribution and its preparation, can solve the problems of high viscosity, high dosage, poor dispersion performance of high-strength and ultra-high-strength concrete, etc.

Active Publication Date: 2019-10-25
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of main chain hydrophobicity and wide molecular weight distribution of existing water reducer products, which lead to high dosage, poor dispersion performance and high viscosity of high-strength and ultra-high-strength concrete, the present invention provides a main chain with a hydrophilic structure and a narrow molecular weight distribution. superplasticizer

Method used

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  • Concrete super plasticizer and preparation method thereof
  • Concrete super plasticizer and preparation method thereof
  • Concrete super plasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Remove water and oxygen from the reactor, add 0.414 parts of B1 and 0.748 parts of potassium tert-butoxide to the reactor under the protection of an inert (nitrogen) atmosphere, adjust the reactor to 100°C, and gradually and evenly add 114.12 parts of D1, the intermediate polymer was obtained after stirring for 24 hours;

[0101] (2) Add 250 parts of G1 to another reactor, adjust the reactor to 60°C, add 1.012 parts of triethylamine, 40.3 parts of I1, 62.21 parts of K1 and the intermediate polymer obtained in step (1), and stir After 24 hours of reaction, the volatile small molecules were removed in vacuo to obtain an intermediate mixture;

[0102] (3) Add 273.3 parts of H3 to the third reactor, adjust the reactor to 100°C, add 7.41 parts of p-toluenesulfonic acid and the intermediate mixture obtained in step (2) to it, stir and dehydrate under vacuum at 100°C for 24h, After the reaction, the volatile small molecules were removed in vacuum, and the reactor was retu...

Embodiment 2

[0104] (1) Remove water and oxygen from the reactor, add 128.13 parts of dimethyl sulfoxide to the reactor under the protection of an inert (nitrogen) atmosphere, then add 9.265 parts of B2 and 0.15 parts of sodium hydride to it, and adjust the reactor to 120 ° C 128.13 parts of D2 were gradually and evenly added to it within 1 hour, and the intermediate polymer was obtained after stirring for 2 hours;

[0105] (2) Add 583.6 parts of G2 to another reactor, adjust the reactor to 20°C, add 2.623 parts of triphenylphosphine, 161 parts of I2, 26.73 parts of K2 and the intermediate polymer obtained in step (1) , After stirring for 6 hours, the volatile small molecules were removed in vacuum, and the reactor was returned to normal pressure and room temperature to obtain a superplasticizer sample PCE-ND02, with a weight average molecular weight of 6.4kDa and a PDI of 1.26.

Embodiment 3

[0107] (1) The reactor is dewatered and deoxygenated, and 426.45 parts of N-methylpyrrolidone are added to the reactor under the protection of an inert (nitrogen) atmosphere, then 0.333 parts of sodium hydroxide and 4.658 parts of B3 are added thereto, and the reactor is adjusted to 150°C, gradually and uniformly add 142.15 parts of D3 to it within 3 hours, stir and react for 8 hours to obtain an intermediate polymer;

[0108] (2) Add 284.6 parts of G3 to another reactor, adjust the reactor to 0°C, add 0.32 parts of tri-n-propylphosphine, 131.02 parts of I3, 21.33 parts of K1 and the intermediate polymerization obtained in step (1) After stirring and reacting for 12 hours, the volatile small molecules were removed in vacuum, and the reactor was returned to normal pressure and room temperature to obtain a superplasticizer sample PCE-ND03 with a weight average molecular weight of 21.0kDa and a PDI of 1.29.

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Abstract

The invention discloses a concrete super plasticizer and a preparation method thereof. The preparation method of the super plasticizer comprises the following steps that polymerizable monomers are added into a solvent and an initiator, the mixture is stirred, and reaction is carried out to obtain an intermediate polymer; a catalyst, two kinds of functional monomers I and the intermediate polymer obtained in the previous step are added into polyether G, and an intermediate mixture is obtained after stirring; the catalyst and the intermediate mixture obtained in the previous step are added intopolyether H, the mixture is stirred, and reaction is carried out to obtain a sample taking the product super plasticizer polymer as a main component. Compared with a common commercial super plasticizer, the concrete super plasticizer is applied to common commercial concrete, and the dosage of the concrete super plasticizer is correspondingly lower than that of the common commercial polycarboxylicacid super plasticizer; the concrete super plasticizer is applied to high-strength concrete above C50, the dosage can be reduced by 4-19% when the concrete super plasticizer reaches the same mobility;and when the concrete super plasticizer is applied to ultra-high strength concrete above C100, the advantages are more prominent, the dosage can be reduced by greater than 6-27%, and viscosity is effectively reduced.

Description

technical field [0001] The invention relates to the field of concrete superplasticizers, in particular to a superplasticizer with narrow molecular weight distribution and a preparation method thereof. Background technique [0002] The term "concrete" is used here generally indiscriminately to mean concrete such as concrete, mortar or grout, and this applies elsewhere in this document as well. [0003] Since the invention of high-performance water reducer (polycarboxylate water reducer), it has been widely used and developed greatly, and it has become an indispensable component in concrete. Generally, the polycarboxylate superplasticizer is a comb-shaped structure, which is generally prepared by free radical polymerization of vinyl-containing monomers, and its main chain (generally -CH 2 -CH 2 -Structure or functional group substituted -CH 1 -CH 2 - structure) is connected with charged functional groups (such as carboxyl, sulfonic acid groups, etc.), and the corresponding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F216/14C08F220/32C04B24/16C04B24/26C04B103/32
CPCC08F283/06C04B24/165C04B24/2605C04B2103/32C08F216/1416
Inventor 冉千平舒鑫杨勇王涛黄振刘金芝毛永琳李申桐周栋梁
Owner JIANGSU SOBUTE NEW MATERIALS
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