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Solid polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of building materials, can solve problems such as difficulty in ensuring product stability, high cost of long-distance transportation, and unsatisfactory use effects, etc., and achieves significant dimensional stability effects, good industrialization prospects, and improved Effect of Adsorption Efficiency and Adsorption Layer Thickness

Inactive Publication Date: 2020-04-28
LIAONING OXIRANCHEM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a solid polycarboxylate water reducer and a preparation method thereof, the solid polycarboxylate water reducer is a low gas content and viscosity-reducing solid polycarboxylate water reducer to solve the existing Viscous solid polycarboxylate superplasticizers have problems such as high production energy consumption, unsatisfactory use effects, difficulty in ensuring product stability, and high long-distance transportation costs.

Method used

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  • Solid polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0031] The present invention provides a kind of preparation method of solid polycarboxylate water reducer, comprising:

[0032] Mix unsaturated polyoxyethylene polyoxypropylene ether and silane coupling agent and heat up (40-55°C) to melt to obtain the primer;

[0033] Add unsaturated carboxylic acid and / or unsaturated carboxylic acid ester to the base material, then add initiator and chain transfer agent dropwise in sequence and keep stirring to carry out polymerization reaction;

[0034] Aging treatment is carried out after the polymerization reaction to obtain a solid material, and the solid polycarboxylate water reducer is obtained. The aging treatment includes keeping the temperature of the polymerization reaction constant and stirring continuously.

[0035] In some embodiments, the weight average molecular weight of the solid polycarboxylate water reducer is 10,000-30,000, further, it may be 10,000-25,000.

[0036] Taking the mass sum of the unsaturated polyoxyethylene...

Embodiment 1

[0061] Add 258 grams of monomer (b-2) and 10 grams of monomer (c-1) into a 500ml four-neck flask equipped with a stirrer, a thermometer, and a dropping device, and add 30 grams of monomer after the temperature is raised to 50 ° C. Monomer (a-1), then drip initiator dimethyl azobisisobutyrate 1.5 grams, chain transfer agent mercaptoacetic acid 0.6 grams, add dropwise at a constant speed for 2 hours respectively, aging time is 1 hour, after the reaction finishes Material, obtains polycarboxylate superplasticizer product GT-1, and its weight-average molecular weight is 13300.

Embodiment 2

[0063] Add 255 grams of monomer (b-1) and 15 grams of monomer (c-2) into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and add 20 grams of monomer after the temperature is raised to 50 ° C. Monomer (a-1) and 4 grams of monomer (a-3), then dropwise add 3.6 grams of initiator azobisisobutyronitrile, 2.4 grams of chain transfer agent thioglycolic acid, add dropwise at a uniform speed for 2 hours respectively, and the aging time is After 1 hour, the material was discharged after the reaction, and the polycarboxylate superplasticizer product GT-2 was obtained, and its weight-average molecular weight was 10600.

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Abstract

The invention provides a solid polycarboxylate superplasticizer and a preparation method thereof. The method comprises the following steps: mixing unsaturated polyoxyethylene polyoxypropylene ether and a silane coupling agent, and heating to melt to obtain a base material; adding unsaturated carboxylic acid and / or unsaturated carboxylic ester into the base material, then sequentially adding an initiator and a chain transfer agent in a dropwise manner, continuously stirring, and carrying out a polymerization reaction; and carrying out aging treatment after the polymerization reaction to obtaina solid material so as to obtain the solid polycarboxylate superplasticizer. The solid polycarboxylate superplasticizer is a low-gas-content viscosity reduction type superplasticizer, the preparationmethod of the solid polycarboxylate superplasticizer is simple and high in operability, and the prepared viscosity reduction type solid polycarboxylate superplasticizer is stable in performance, low in transportation cost and free of pollution to the environment and has good industrial prospects.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a solid polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, high-grade concrete is gradually entering the construction market due to its high strength, good integrity and low self-weight, especially in bridge engineering. However, due to the low water-binder ratio and large amount of cementitious materials, high-grade concrete has the problems of high viscosity and slow flow speed in application. Although mineral admixtures can adjust the cohesion of concrete, they are not applicable because they will increase the amount of excessive cementitious materials. [0003] Functional solid polycarboxylate superplasticizer can effectively reduce the amount of water and cementitious materials in concrete, adjust the cohesion and water retention of concrete, and is one of the main ways to improve the workability of concrete. Its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/08C08F220/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2688C04B2103/302
Inventor 朱建民刘兆滨董振鹏刘晓杰
Owner LIAONING OXIRANCHEM INC
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