A kind of preparation method of early-strength solid polycarboxylate water reducer

A technology of polycarboxylate and water reducing agent, which is applied in the field of construction admixtures, can solve the problems of polycarboxylate water reducing agent loss, water reducing effect, expensive equipment, etc., and achieve improved compactness, superior early strength performance, Effect of improving early mechanical properties

Active Publication Date: 2019-03-12
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation of solid polycarboxylate superplasticizers is high in preparation cost, expensive in equipment, and high in energy consumption. The effect of water reduction is affected to a certain extent

Method used

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  • A kind of preparation method of early-strength solid polycarboxylate water reducer

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Experimental program
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Effect test

Embodiment 1

[0025] A preparation method of early-strength solid polycarboxylate water reducer, comprising the following steps:

[0026] (1) Add isopentenyl polyoxyethylene ether and cumenyl polyoxyethylene ether into the reaction kettle, raise the temperature to 80°C, make it in a molten state, and then add N,N-dimethylaniline at one time , and stir evenly;

[0027] (2) In the material obtained in step (1), add dropwise the first mixed solution composed of acrylic acid, acryloyloxyethyltrimethylammonium chloride and the mixture composed of azoisobutylcyanoformamide, 3,6- The second mixed solution composed of dioxygen-1,8-octanedithiol and carbon tetrachloride was dropped within 3 hours and continued to react for 1 hour;

[0028] (3) After the reaction finishes, adopt mechanical pump to vacuumize 10min, and vacuum pressure is 0.01~0.05MPa, removes the carbon tetrachloride in the material gained in step (2), adopts condensing microtome to slice then, promptly obtains the white flaky Solid...

Embodiment 2

[0031] (1) Add isopentenyl polyoxyethylene ether and cumenyl polyoxyethylene ether into the reaction kettle, raise the temperature to 90°C, make it in a molten state, and then add N,N-dimethylaniline at one time , and stir evenly;

[0032] (2) In the material obtained in step (1), add dropwise the first mixed solution composed of acrylic acid, methacryloyloxyethyltrimethylammonium chloride and the mixture composed of tert-butyl hydroperoxide, 3,6- The second mixed solution composed of dioxy-1,8-octanedithiol and n-hexane is dropped within 3 hours, and the reaction is continued for 1 hour;

[0033] (3) After the reaction is over, use a mechanical pump to vacuumize for 10 minutes, and the vacuum pressure is 0.01 to 0.05 MPa to remove the n-hexane in the material obtained in step (2), and then use a condensing microtome to slice it to obtain white sheet-like solid polymer. Carboxylic acid superplasticizer, and packed by packing machine.

[0034] Wherein, the molar ratio of the ...

Embodiment 3

[0036] A preparation method of early-strength solid polycarboxylate water reducer, comprising the following steps:

[0037] (1) Add methallyl polyoxyethylene ether and cumenyl polyoxyethylene ether into the reaction kettle, raise the temperature to 90°C, make it in a molten state, and then add N,N-diethyl aniline, and stir well;

[0038] (2) In the material obtained in step (1), add dropwise the first mixed solution composed of acrylic acid, dimethyl diallyl ammonium chloride and the mixture composed of tert-butyl peroxybenzoate, 3,6-dioxo The second mixed solution composed of -1,8-octanedithiol and acetone was dropped within 3 hours, and continued to react for 1 hour;

[0039] (3) After the reaction, use a mechanical pump to evacuate for 10 minutes, the vacuum pressure is 0.01-0.05MPa, remove the acetone in the material obtained in step (2), and then use a condensing microtome to slice it to obtain white flake solid polycarboxylate Acid water reducer and packed by packing m...

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Abstract

The invention discloses a preparation method of an early-strength solid polycarboxylic acid water reducer, which comprises the following steps of: (1) adding unsaturated polyoxyethylene ether and cumenyl polyoxyethylene ether into a reaction kettle, heating up to allow unsaturated polyoxyethylene ether and cumenyl polyoxyethylene ether to be in a molten state, then adding a catalyst at one time, uniformly stirring, (2) dropwise adding a first mixed solution and a second mixed solution into a material obtained in step (1), and continuing reaction after dropping, and (3) after reaction completion, vacuumizing with a mechanical pump, removing an organic solvent from a material obtained in step (2), and slicing with a condensation slicer to form the white sheet solid polycarboxylic acid water reducer. The product can effectively shorten concrete setting time, improves compactness of an early microstructure, greatly improves early mechanical properties of a grout body, and promotes early strength development of concrete; and the concrete shows excellent early-strength performance.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of an early-strength solid polycarboxylate water reducer. Background technique [0002] As the fifth component of modern concrete, polycarboxylate superplasticizer has been widely used in the field of concrete engineering technology due to its excellent low dosage, high slump retention, and large degree of freedom in molecular design. At present, most widely used polycarboxylate superplasticizers are solution products with a concentration of 10-50%. Due to the remote distance of some construction sites, the lower solid content will increase the transportation cost; in addition, the wide application of dry powder mortar also puts forward an urgent demand for the production and application of solid polycarboxylate water reducer. At present, most of the powder polycarboxylate water-reducers on the market are obtained by spray drying, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/34C08F226/02C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06
Inventor 张小芳柯余良方云辉李格丽林倩尹峻
Owner KZJ NEW MATERIALS GROUP CO LTD
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