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High-performance water-reducing agent and preparation method thereof

A water reducer, high-performance technology, applied in the field of high-performance water reducer and its preparation, can solve the problems of short retardation time, difficult control of esterification rate, low ability of polymer slump, etc., to achieve good water reducer Good water performance, fluidity retention and slump retention performance

Active Publication Date: 2017-11-17
大同恒安混凝土外加剂有限公司
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AI Technical Summary

Problems solved by technology

However, in the process of preparing macromonomers, due to difficult control of process conditions and other reasons, it is difficult to control the esterification rate, which makes it difficult to control the molecular weight of the polycarboxylate water reducer. If the relative molecular weight of the polycarboxylate water reducer is too large, The dispersion performance of the polymer is not good. If the relative molecular weight is too small, the ability of the polymer to maintain the slump is not high, and the retardation time is short, which cannot meet the requirements of pumping construction and high-strength and high-performance concrete.

Method used

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  • High-performance water-reducing agent and preparation method thereof
  • High-performance water-reducing agent and preparation method thereof
  • High-performance water-reducing agent and preparation method thereof

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preparation example Construction

[0041] The preparation method of the high-performance water reducer in each of the above embodiments is as follows:

[0042] Esterification: Take polyethylene glycol and 1,4,5,8-naphthalene tetracarboxylic anhydride, melt the polyethylene glycol and 1,4,5,8-naphthalene tetracarboxylic anhydride and add them to the reaction kettle at the same time, stir evenly , filled with nitrogen, the nitrogen flow rate is S, at the same time add the initiator A, increase the temperature T of the reactor 1 , stir evenly t 1 , then add concentrated sulfuric acid, continue to raise the temperature T of the reactor 2 , stir evenly t 2 , after the reaction is completed, the esterified macromonomer is obtained;

[0043] Polymerization: Take the prepared macromer, (S)-(-)-2-amino-4-pentenoic acid, and molecular weight regulator and mix evenly to obtain mixture C; take initiator B and deionized water and mix evenly, Obtain mixture D; Reactor is warmed up to T 3 , while adding mixture C and mix...

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Abstract

The invention relates to a high-performance water-reducing agent. The high-performance water-reducing agent is prepared from, by weight, 20-30 parts of polyethylene glycol, 15-19 parts of 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2.5-5 parts of initiator A, 1-5 parts of concentrated sulfuric acid, 15-21 parts of (S)-(-)-2-amino-4-pentenoic acid, 0.9-3 parts of molecular weight regulator, 5-9 parts of initiator B, 60-80 parts of deionized water and 1-3 parts of NaOH solid particles. The high-performance water-reducing agent has good water reducing performance.

Description

technical field [0001] The invention relates to the field of concrete admixtures, more specifically, it relates to a high-performance water reducer and a preparation method thereof. Background technique [0002] Water reducer is currently the most widely studied and used concrete admixture, and has become the fifth component of concrete besides cement, sand, stone and water. Water reducer is an admixture that has the effects of water reduction and retardation under the condition that the concrete slump is basically the same and does not affect the workability. It also has the effect of increasing the rheology of the mixture or saving the amount of cement. The main purpose of using water reducing agent in engineering is to reduce the water consumption of concrete, reduce the water-cement ratio, save the amount of single cement, and improve its workability. [0003] In the process of concrete construction, in order to improve the compactness and strength of concrete, the wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/04C08F2/38C08G65/331C04B24/28C04B103/30
CPCC04B24/283C04B2103/302C08F2/38C08F283/06C08G65/3318C08F220/04
Inventor 赵家琦
Owner 大同恒安混凝土外加剂有限公司
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