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A kind of polyhydroxyl air-entraining retarding water reducing agent and preparation method thereof

A technology of retarding and water-reducing agent, which is applied in the field of concrete admixtures to achieve the effects of improving retention time, delaying hydration, and prolonging storage time

Active Publication Date: 2022-05-10
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are few water-reducing agents with both air-entraining and retarding functions. Therefore, the development of a polycarboxylate-based high-performance water-reducing agent with air-entraining and retarding functions is of great significance to the development of concrete admixtures and the concrete industry. Significance

Method used

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  • A kind of polyhydroxyl air-entraining retarding water reducing agent and preparation method thereof
  • A kind of polyhydroxyl air-entraining retarding water reducing agent and preparation method thereof
  • A kind of polyhydroxyl air-entraining retarding water reducing agent and preparation method thereof

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preparation example Construction

[0041] The invention provides a method for preparing a polyhydroxy air-entraining retarding water reducer, which comprises the following steps:

[0042] Put vinyl ether macromonomer, retarding monomer, reducing agent and appropriate amount of deionized water in the reactor, stir to dissolve, add unsaturated acid, unsaturated ester and air-entraining monomer dropwise into the reactor The mixed solution, oxidant solution and chain transfer agent solution, and adjust the temperature to 5 ~ 15 ° C to react, the dropwise addition time is 0.5 ~ 1h, after the dropwise addition, keep warm for 0.5 ~ 1.5h, after the reaction, use liquid alkali to adjust the pH to 6 to 7, the polyhydroxy air-entraining retarding water reducer is obtained.

[0043] Wherein, the mass ratio of the ether macromonomer, air-entraining monomer, retarding monomer, unsaturated acid, and unsaturated ester is: (0-200): (1-10): (10-200 ): (10~30): (1~10).

[0044] The vinyl ether macromonomer is preferably 4-hydroxy...

Embodiment 1

[0064] (1) Preparation of air-entraining monomer B1: 0.1 mol of bis(hydroxyethyl)methyl dodecyl ammonium chloride, 0.1 mol of acryloyl chloride, 40 mL of 1,4 dioxane, and 0.1 mol of pyridine were placed in the reaction In the reactor, under the condition of 15°C, the reaction was carried out for 10 h, and the product was purified by vacuum distillation and recrystallization to obtain the air-entraining monomer B1.

[0065] (2) Preparation of retarding monomer C1: 200 parts of molecular weight 4-hydroxybutyl vinyl polyoxyethylene ether-2400, 15 parts of gluconic acid, 1.0 parts of concentrated sulfuric acid and 0.1 part of p-hydroxyanisole were added to In the first reactor equipped with a condensing device, the temperature was maintained at 120°C for 6 hours under the protection of nitrogen, and the temperature was lowered to 40°C after the reaction was completed to obtain retarded monomer C1.

[0066] (3) Copolymerization reaction: 50 parts of 4-hydroxybutyl vinyl polyoxyethy...

Embodiment 2

[0068] Put 200 parts of retarding monomer C1, 1.5 parts of sodium formaldehyde sulfoxylate and appropriate amount of deionized water in the reactor, stir to dissolve, add 20 parts of acrylic acid, 4 parts of 2-methacryloyl A mixed solution of oxyethylphosphorylcholine, 4 parts of air-entraining monomer B1, 2 parts of hydrogen peroxide solution and 1 part of mercaptopropionic acid solution, and adjust the temperature to 15°C for the reaction. The dropping time is 45 minutes. After the completion of the heat preservation for 1.0h, adjust the pH to 6-7 with liquid caustic soda after the reaction, and obtain the polyhydroxy air-entraining polycarboxylate water reducer PCE-2. Wherein, water consumption is the consumption that makes mother liquor solid content be 50%.

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Abstract

The present invention relates to the technical field of concrete admixtures, in particular to a polyhydroxy air-entraining retarding water reducer and a preparation method thereof, wherein the water reducer comprises: a retarding polymer, the retarding polymer Comprising polymers or copolymers derived from monomers including 1) retarded monomers, air-entraining monomers; and 2) vinyl ether macromonomers, unsaturated acids, unsaturated esters at least one of . The polyhydroxy air-entraining retarding water reducer provided by the present invention can delay the hydration of cement, and introduce air bubbles and stable air bubbles into the concrete, so as to achieve the effect of retarding and long-term air-entraining, and at the same time, it has antibacterial and anti-corrosion properties. The effect of high dispersion and slump protection has broad market application prospects.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polyhydroxy air-entraining retarding water reducer and a preparation method thereof. Background technique [0002] With the large-scale construction of foundation projects in my country, the requirements for the workability, strength and durability of concrete have been continuously improved, which has promoted the rapid development of concrete admixtures, especially the rapid development of polycarboxylic acid-based high-performance water reducers. . Polycarboxylate-based high-performance water reducer is an important component of concrete admixture. When it is added to concrete, it has a certain air-entraining effect, but the quality of the introduced foam is poor, and the foam stabilization performance is also poor, which cannot meet the requirements of high performance. To meet the demand of concrete durability, it is generally necessary to add air-entraining ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/34C08F220/06C08F230/02C04B24/26C04B103/30
CPCC08F283/065C04B24/246C04B2103/302C08F220/34C08F220/06C08F230/02
Inventor 钟丽娜方云辉王昭鹏柯余良张小芳
Owner KZJ NEW MATERIALS GROUP CO LTD
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