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Method for continuous synthesis of polycarboxylic acid water reducer

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of wide molecular weight distribution of polymer products and the inability to effectively control molecular structure by feeding materials, and achieve the effect of narrow molecular weight distribution

Active Publication Date: 2016-07-27
LIAONING OXIRANCHEM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although the current methods of synthesizing water reducers can realize the continuous production of polycarboxylate water reducers to a certain extent, the molecular structure of the synthesized products cannot be effectively controlled through the feeding of a single feed point, and the molecular weight of the polymerized products also exists. The problem of wide distribution

Method used

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  • Method for continuous synthesis of polycarboxylic acid water reducer
  • Method for continuous synthesis of polycarboxylic acid water reducer
  • Method for continuous synthesis of polycarboxylic acid water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Add 3000kg of HPEG (methallyl alcohol polyoxyethylene ether) and 3000kg of deionized water to the pretreatment tank A according to the actual formulation requirements of various raw materials used in the synthesis of polycarboxylate water reducer, fully dissolve and stir to obtain solution a Add acrylic acid 360.3kg in pretreatment tank B, deionized water 3000kg, stir to obtain solution b; Add ammonium persulfate 14.7kg in pretreatment tank C, deionized water 60kg, stir to obtain solution c; Pretreatment tank D Add 16.6kg of thioglycolic acid, 80kg of deionized water, and stir to obtain solution d.

[0070] The first feeding point is located at the starting end of the tubular reactor, and the speed of each feeding pump is controlled. At the first feeding point, 6000 kg of a solution and 1680.15 kg of b solution are evenly pumped into the tubular reactor in a 50°C constant temperature water bath. kg, solution c 29.88kg, solution d 48.3kg;

[0071] When the mixed materia...

Embodiment 2

[0078]According to the actual formulation requirements, add 2400kg of HPEG and 3600kg of deionized water into the pretreatment tank A, and fully dissolve and stir the various raw materials used in the synthesis of polycarboxylate water reducer to obtain solution a; 2500kg of deionized water was stirred evenly to obtain solution b; 13.2kg of ammonium persulfate and 60kg of deionized water were added to pretreatment tank C, and solution c was obtained by stirring; 20.1kg of mercaptopropionic acid and 120kg of deionized water were added to pretreatment tank D , Stir evenly to obtain solution d. Add 19.2kg of sodium ascorbate and 80kg of deionized water into pretreatment tank E, and stir to obtain solution e.

[0079] The first feeding point is located at the starting end of the tubular reactor, and the speed of each feeding pump is controlled. At the first feeding point, 3600 kg of a solution and 1129.71 kg of b solution are evenly pumped into the tubular reactor in a 40°C consta...

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Abstract

The invention provides a method for continuous synthesis of a polycarboxylic acid water reducer. The method comprises providing a tubular reactor with a first feeding point, a second feeding point, a third feeding point, a forth feeding point and a fifth feeding point, continuously adding a mixed raw material to the first feeding point, the second feeding point, the third feeding point, the forth feeding point and the fifth feeding point according to a ratio and carrying out a reaction process to obtain the polycarboxylic acid water reducer. The mixed raw material comprises an unsaturated polyether macromonomer, an acrylic acid monomer, an initiator and a chain transfer agent. The method well controls a polycarboxylic acid water reducer synthesis process. The polycarboxylic acid water reducer has product performances better than those of the existing water reducer product prepared through a batch-type synthesis method and has a narrow molecular weight distribution range.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a method for synthesizing a polycarboxylate water reducer by adopting a continuous synthesis method and equipment. Background technique [0002] Polycarboxylate Superplasticizer is an important admixture used in concrete. As an efficient cement particle dispersant, it can effectively disperse cement particles in the concrete mixing process, thereby reducing the mixing process. The water consumption of concrete can achieve the purpose of improving the strength of the mixed concrete. [0003] The molecular structure of polycarboxylate superplasticizer is composed of main chain and side chain, the main chain is polyacrylic acid polymer, and the side chain is polyoxyethylene ether polymer. Among them, there are a large number of negatively charged carboxyl groups in the main chain structure, which can combine with cement particles with a large number of positive charges ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F2/00C08F2/01C04B24/26C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明刘枫
Owner LIAONING OXIRANCHEM INC
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