A kind of phosphate type polycarboxylate water reducer and preparation method

A phosphate-type polycarboxylic acid and water reducing agent technology, which is applied in the field of building materials, can solve the problems of poor adaptability of aggregates with high mud content, and achieve the goals of improving adaptability, reducing adsorption, improving dispersion and dispersion retention Effect

Active Publication Date: 2020-08-11
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a phosphate type polycarboxylate water reducer and its preparation method, aiming to solve the problem of poor adaptability of polycarboxylate water reducer to aggregates with high mud content in the prior art

Method used

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  • A kind of phosphate type polycarboxylate water reducer and preparation method
  • A kind of phosphate type polycarboxylate water reducer and preparation method
  • A kind of phosphate type polycarboxylate water reducer and preparation method

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Effect test

Embodiment 1

[0037] A preparation method of a phosphate-type polycarboxylate water reducer is provided in this embodiment, including:

[0038] (1) Preparation of the first polymer: Add 100.0g of polyacrylic acid with a mass fraction of 55% into the reaction vessel and heat to 50~70°C. Under the protection of nitrogen, add 300.0g of polyethylene glycol phosphate, 1.12g Antioxidant (specifically Irganox5057) and 2.30g catalyst (specifically ethylsulfonic acid), then, the temperature was raised to 155~160°C for esterification reaction under reduced pressure, the pressure dropped to 80mbar, and the reaction was kept for 4h, during which Remove water by vacuuming. After the reaction, cool the product to 60~80℃, add distilled water to dilute, and adjust the mass concentration of the polymer to 45~55%.

[0039] (2) Preparation of the second polymer: Add 340.0g of isobutylene alcohol polyoxyethylene ether with a molecular weight of 4000, 10.0g of hydroxybutyl methacrylate, 21.0g of acrylic acid, 3...

Embodiment 2

[0043] (1) Preparation of the first polymer: Add 130.0g of polyacrylic acid with a mass fraction of 55% into the reaction vessel and heat it to 50~70°C. Under the protection of nitrogen, add 350.0g of polyethylene glycol phosphate, 2.40g Irganox 5057 antioxidant and 3.67g of benzenesulfonic acid, then, the temperature was raised to 150~155°C, and the esterification reaction was carried out under reduced pressure, and the pressure was dropped to 80mbar, and the reaction was kept for 5 hours. Finally, cool the product to 60~80℃, add distilled water to dilute, and adjust the mass concentration of the polymer to 45~55%.

[0044] (2) Preparation of the second polymer: 40.0 g of methallyl alcohol polyoxyethylene ether with a molecular weight of 4000, 360.0 g of isobutyl alcohol polyoxyethylene ether with a molecular weight of 6000, and 5.0 g of hydroxybutyl methacrylate , 40.0g maleic anhydride, 50.0g compound A (R 1 for -CH 2 CH 2 , R 2 for CH 3 , n is 50) and 200.0g of deioni...

Embodiment 3

[0047] (1) Preparation of the first polymer: Add 115.0g of polyacrylic acid with a mass fraction of 55% into the reaction vessel and heat it to 50~70°C. Under nitrogen protection, add 342.0g of polyethylene glycol phosphate, 2.67g Irganox 5057 antioxidant and 4.88g of p-toluenesulfonic acid, then, the temperature was raised to 155~160°C for esterification under reduced pressure, the pressure dropped to 80mbar, and the heat preservation reaction was carried out for 3 hours. After the end, cool the product to 60~80°C, add distilled water to dilute, and adjust the mass concentration of the polymer to 45~55%.

[0048] (2) Preparation of the second polymer: 100.0 g of prenol polyoxyethylene ether with a molecular weight of 6000, 300.0 g of isobutenol polyoxyethylene ether with a molecular weight of 6000, 18.0 g of hydroxybutyl acrylate, 12.0 g Itaconic acid, 30.0g compound A (R1 is -CH 2 , R 2 for CH 3 , n is 40) and 200.0g deionized water were added to the reaction vessel and m...

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Abstract

The invention relates to the technical field of building materials, and discloses a phosphate-type polycarboxylate water-reducing agent and a preparation method. The first polymerization of the active ingredient with a molecular weight of 5,000 to 20,000 is obtained by esterification of polyacrylic acid and polyethylene glycol phosphate ester. The substance is copolymerized by unsaturated polyether, unsaturated phosphate ester and compound A to obtain a second polymer with an active component molecular weight of 30,000 to 80,000. The first and second polymers are mixed in proportion to form the phosphate polycarboxylic acid. When the water-reducing agent is mixed, due to the small molecular weight of the first polymer, it is preferentially adsorbed and intercalated into the layered structure of the clay, which greatly reduces the adsorption of the second polymer by the clay, thereby improving the adsorption of the water-reducing agent to various sand and gravel aggregates. adaptability.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a phosphate-type polycarboxylate water reducer. Background technique [0002] With the construction of large-scale infrastructure in the country, polycarboxylate superplasticizers are more and more widely used in concrete engineering. However, the raw material situation of modern concrete is becoming more and more serious. The use of industrial by-product gypsum as a cement coagulation agent leads to high SO42- content in cementitious materials; the wide application of fly ash, slag powder, coal gangue and other bulk industrial solid wastes, This makes the composition of the cementitious material more complex; especially the high-quality sand and stone resources are increasingly scarce, and the aggregate mud content and water absorption rate increase, which directly affects the adaptability between the concrete admixture and the material, resulting in the initial fluid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B24/26C08F283/06C08F230/02C04B103/30
CPCC04B24/26C04B24/32C04B40/0039C08F283/065C04B2103/302C08F230/02
Inventor 赖华珍方云辉赖广兴邵幼哲陈展华郭元强麻秀星杨浩
Owner KZJ NEW MATERIALS GROUP CO LTD
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