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A method for continuous synthesis of polycarboxylate water reducer

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, can solve the problems of wide molecular weight distribution of polymerization products and the inability to effectively control the molecular structure of feed materials, etc., and achieve the effect of narrow molecular weight distribution

Active Publication Date: 2018-07-10
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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  • A method for continuous synthesis of polycarboxylate water reducer
  • A method for continuous synthesis of polycarboxylate water reducer
  • A method for continuous synthesis of polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
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 continuously synthesizing a polycarboxylate water reducer, comprising: providing a tubular reactor, the tubular reactor has a first feed point, a second feed point, and a third feed point , the fourth feed point and the fifth feed point; and at the first feed point, the second feed point, the third feed point, the fourth feed point and the first feed point The mixed raw materials are continuously added in proportion to the five feeding points, and the polycarboxylate water reducer is obtained through reaction. The mixed raw materials include unsaturated polyether macromonomers, acrylic monomers, initiators and chain transfer agents. The method for continuously synthesizing polycarboxylate water reducer of the present invention can better control the synthesis process of polycarboxylate water reducer, and the performance of the product obtained is better than that of existing batch type synthetic water reducer products, and its molecular weight distribution is also relatively low. narrow.

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 The water consumption of the concrete is reduced to achieve the purpose of improving the strength of the concrete to be mixed. [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 positi...

Claims

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Application Information

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Patent Type & Authority Patents(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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