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Multifunctional polycarboxylic acid water reducing agent and preparing method thereof

A multi-functional polycarboxylic acid technology, applied in the field of concrete admixture, can solve the problems of poor concrete surface finish, poor encapsulation of cementitious materials, poor early strength effect, etc., to improve encapsulation, enhance steric hindrance effect, The effect of reducing viscosity

Inactive Publication Date: 2019-07-05
SHANXI GERUITE BUILDING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a multifunctional polycarboxylate water reducer and its preparation method, which can solve the problems of poor early strength and poor gelation when the existing polycarboxylate water reducer produces prefabricated components. Problems of poor encapsulation of materials and poor surface finish of concrete

Method used

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preparation example Construction

[0032] A preparation method of multifunctional polycarboxylate water reducer, comprising the following steps:

[0033] S1. Add 55-70 parts of phosphorus oxychloride and 27-41 parts of ethyl acetate into the four-necked flask, control the temperature in the flask to 10-15°C, slowly add 20-25 parts of diethylene glycol dropwise into the four-necked flask During 3h, the gas generated in the four-necked flask is exported with the outlet device and absorbed with lye, and then reacted for 1h after the dropwise addition is completed;

[0034] S2. Raise the temperature of the reactor to 25-30°C, slowly drop the mixed solution of 80-95 parts of hydroxyethyl acrylate and 95-110 parts of triethylamine into the reactor for 2 hours, then raise the temperature to 45-50°C, and reflux Under the condition of reaction for 12h;

[0035] After the reaction of S3 and S2 is completed, the ammonium salt is removed by vacuum filtration, distilled at -0.085Mpa pressure and 70°C, and the ethyl acetate...

Embodiment 1

[0042] (1) Accurately add 62g of phosphorus oxychloride and 30ml of ethyl acetate into a 500ml four-necked flask equipped with a stirring device, a gas outlet device, and a thermometer, and control the temperature in the flask to 10-15°C through a water bath. Exporting device, use a peristaltic pump to slowly drop 21.2g of diethylene glycol into the reactor, the dropping time is 3h, and the exported gas is absorbed by NaOH solution with a concentration of 10%, and then react for 1h after the dropping;

[0043] (2) Raise the temperature of the reactor to 25-30°C, and slowly add a mixed solution of 91.7g of hydroxyethyl acrylate and 101g of triethylamine dropwise with a peristaltic pump for 2 hours. 45-50°C, continue to react for 12h under reflux;

[0044] (3) After the reaction, remove the ammonium salt by vacuum filtration, distill at -0.085Mpa pressure and 70°C, and remove ethyl acetate to obtain the acrylate compound;

[0045] (4) Accurately weigh 20g of the acrylate obtain...

Embodiment 2

[0050] A preparation method of multifunctional polycarboxylate water reducer, comprising the following steps:

[0051] (1) Accurately add 64g of phosphorus oxychloride and 35ml of ethyl acetate into a 500ml four-neck flask equipped with a stirring device, a gas outlet device, and a thermometer, and control the temperature in the flask to 10-15°C through a water bath. Exporting device, use a peristaltic pump to slowly drop 25g of ethylene glycol into the reactor, the dropping time is 3h, and at the same time, the exported gas is absorbed by NaOH solution with a concentration of 10%, and then react for 1h after the dropping;

[0052] (2) Raise the temperature of the reactor to 25-30°C, and slowly add a mixed solution of 93g of hydroxyethyl acrylate and 105g of triethylamine dropwise with a peristaltic pump for 2 hours. -50°C, continue to react for 12h under reflux;

[0053] (3) After the reaction, remove the ammonium salt by vacuum filtration, distill at -0.085Mpa pressure and ...

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Abstract

The invention relates to the technical field of concrete additives, in particular to a multifunctional polycarboxylic acid water reducing agent and a preparing method thereof. By means of the water reducing agent, polycarboxylic acid of a branched structure is formed through free radical polymerization, the steric hindrance effect of side chains in molecules is enhanced, and the water reducing rate of the water reducing agent is increased; by introducing phosphate, the adsorption rate of the polycarboxylic acid water reducing agent on the surface of cement is increased, the water reducing rateis further increased, and the early strength is improved; after introduced diglycol is released, the viscosity of concrete can be remarkably reduced, and construction performance is improved; methylmethacrylate is added in the free radial polymerization reaction, in combination with all ester structures in polycarboxylic acid molecules, the encapsulation property of a gel material in the concrete can be remarkably improved, and therefore the workability of the concrete is improved, the surface smoothness of a prefabricated component is improved, and the decoration function of the prefabricated component is improved; the polycarboxylic acid water reducing agent has the advantages of being high in adaptability and pertinence and is particularly suitable for producing the prefabricated component, simple in production process and convenient to produce industrially.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, and more specifically relates to a multifunctional polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's national economy, people's requirements for the performance, quality and living environment of houses are increasing day by day. However, at present, the construction industry in my country generally adopts the construction method of cast-in-place, which has many disadvantages such as time-consuming and labor-intensive, low efficiency, unreasonable layout, single function, and serious environmental pollution. Under the situation of increasingly tense global resources and increasingly urgent environmental pressure, especially for developing countries, it is imperative to change the urban construction mode and the development mode of the construction industry. The prefabricated building is undoubtedly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/20C08F220/06C08F220/14C04B24/26C04B103/30
CPCC04B24/2694C04B2103/30C08F283/065C08F220/20
Inventor 乔醴峰秦满义任云杰潘少华王志杰
Owner SHANXI GERUITE BUILDING TECH
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