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

A retarding, water-reducing agent technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of insufficient retarding effect of water-reducing agent, so as to prolong the storage time and reduce shrinkage , Improve the effect of dispersion and slump retention

Active Publication Date: 2022-07-05
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of insufficient retarding effect of the existing water reducer mentioned in the above background technology, the present invention provides an air-entraining retarded water reducer, the water reducer includes:

Method used

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

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preparation example Construction

[0043] The invention provides a preparation method of an air-entraining retarder type water reducing agent, comprising the following steps:

[0044] Place the ether macromonomer, retarder monomer, reducing agent and appropriate amount of deionized water in the reactor, stir and dissolve, dropwise add the mixture of unsaturated acid, unsaturated ester and air-entraining monomer into the reactor solution, as well as oxidant solution and chain transfer agent solution, and adjust the temperature to 25-50 ℃ for reaction, the dropwise addition time is 1-3h, after the dropwise addition is completed, the temperature is kept for 0.5-1.5h, after the reaction is completed, it is lowered to room temperature, and liquid caustic soda Adjust the pH to 6-7 to obtain the air-entraining retarding water reducing agent;

[0045]Wherein, the mass ratio of the ether macromonomer, air-entraining monomer, retarding monomer, unsaturated acid and unsaturated ester is: (0~200):(1~30):(50~200 ):(10~30):...

Embodiment 1

[0066] (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 The product was purified by vacuum distillation and recrystallization to obtain the air-entraining monomer B1 under the condition of 15 ℃ in the reactor for 10 hours.

[0067] (2) Preparation of retarded monomer C1: add 200 parts of molecular weight isopentenyl polyoxyethylene ether-2400, 15 parts of gluconic acid, 1.0 part of concentrated sulfuric acid and 0.1 part of p-hydroxyanisole In the first reactor of the device, the temperature was kept at 120°C for 6 hours under the protection of nitrogen, and the temperature was lowered to 40°C after the reaction, to obtain the retarded monomer C1.

[0068] (3) Copolymerization: put 50 parts of isopentenyl polyoxyethylene ether-2400, 150 parts of retarded monomer C1, 1.5 parts of sodium formaldehyde sulfoxylate and a...

Embodiment 2

[0070] 200 parts of retarded monomer C1, 1.5 parts of sodium formaldehyde sulfoxylate and an appropriate amount of deionized water were placed in the reactor, stirred and dissolved, and 20 parts of acrylic acid and 4 parts of 2-methacryloyl were added dropwise to the reactor. The mixed solution of oxyethyl phosphorylcholine, 4 parts of air-entraining monomer B1, 2 parts of hydrogen peroxide solution and 1 part of mercaptopropionic acid solution was added dropwise at 30°C for 3h, after the dropwise addition was completed, the mixture was kept for 1h, and the reaction was completed with The pH of the liquid alkali is adjusted to 6-7 to obtain the air-entraining retarding water reducing agent PC-2. Wherein, the amount of water used is the amount required to make the solid content of the mother liquor 50%.

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Abstract

The present invention relates to the technical field of concrete admixtures, in particular to an air-entraining retarding water reducing agent and a preparation method thereof, wherein the water reducing agent comprises: a retarding polymer, and the retarding polymer comprises a A polymer or copolymer from a monomer, the monomer includes 1) a retarder monomer; and 2) at least one of ether macromonomer, unsaturated acid, and unsaturated ester. The air-entraining retarding type water reducing agent provided by the 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 setting and long-term air-entraining, and at the same time, it has antibacterial and anti-corrosion, high dispersion The effect of slump protection has a wide range of market application prospects.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an air-entraining retarder type 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, durability and other properties of concrete have been continuously improved, which has prompted the rapid development of concrete admixtures, especially the rapid development of polycarboxylic acid-based high-performance water reducers. . As an important component of concrete admixture, polycarboxylic acid-based high-performance water-reducing admixture has a certain air-entraining effect when added to concrete, but the quality of the introduced foam is poor, and the foam-stabilizing performance is also poor, which cannot meet the high performance requirements. To meet the requirements of concrete durability, it is generally necessary to add ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F220/34C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08G65/3322C08G2650/04C08F220/06C08F230/02C08F220/34Y02W30/91
Inventor 钟丽娜方云辉柯余良王昭鹏
Owner KZJ NEW MATERIALS GROUP CO LTD
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