Air-entraining monomer, air-entraining water reducing agent and preparation method thereof

A water reducer and monomer technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxyl compounds, etc., can solve the problems of insufficient air-entraining effect of water reducers, so as to prolong the storage time and improve the retention time , the effect of reducing sensitivity

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

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of insufficient air-entraining effect of existing water reducers mentioned in the above background technology, the present invention provides an air-entraining monomer, which is composed of unsaturated acid chloride and quaternary hydroxyalkyl Ammonium salts are prepared by esterification

Method used

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  • Air-entraining monomer, air-entraining water reducing agent and preparation method thereof
  • Air-entraining monomer, air-entraining water reducing agent and preparation method thereof
  • Air-entraining monomer, air-entraining water reducing agent and preparation method thereof

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preparation example Construction

[0034] The invention provides a preparation method of an air-entraining polycarboxylate water reducer, comprising the following steps:

[0035] The ether macromonomer, reducing agent and appropriate amount of deionized water are placed in the reactor, stirred and dissolved, and the mixed solution of unsaturated acid and unsaturated ester, air-entraining monomer solution, oxidant and chain are added dropwise to the reactor. transfer agent, and adjust the temperature to 25-50 ℃ to carry out the reaction, the dropwise addition time is 1-3h, after the dropwise addition, the temperature is kept for 0.5-1.5h, after the reaction is completed, the temperature is lowered to room temperature, and the pH is adjusted to 6-7 with liquid caustic soda, i.e. Obtain air-entraining water reducing agent;

[0036] Wherein, the mass ratio of the ether macromonomer, the air-entraining monomer, the unsaturated acid, and the unsaturated ester is: 200: (1-30): (10-30): (1-10);

[0037] The ether macr...

Embodiment 1

[0051] (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.

[0052] (2) Copolymerization: by weight, 200 parts of isopentenyl polyoxyethylene ether-2400, 1.5 parts of sodium formaldehyde sulfoxylate and deionized water are placed in the reactor, stirred and dissolved, and added to the reactor. Add dropwise the mixed solution of 20 parts of acrylic acid, 2 parts of 2-methacryloyloxyethyl phosphate and 3 parts of air-entraining monomer B1, 2 parts of hydrogen peroxide solution, 1 part of thioglycolic acid solution, dropwise at 25°C The time is 3h, the temperature is kept for 1h after the dropwise addition is completed, the temperature is lowered to room tem...

Embodiment 2

[0054] (1) Preparation of air-entraining monomer B2: 0.1 mol of octadecylbis(2-hydroxyethyl)methylammonium chloride, 0.1 mol of acryloyl chloride, 45 mL of 1,4 dioxane, and 0.1 mol of pyridine were placed In the reactor, the reaction was carried out at 15°C for 10 hours, and the product was purified by vacuum distillation and recrystallization to obtain the air-entraining monomer B2.

[0055] (2) copolymerization reaction: in parts by weight, 200 parts of isopentenyl polyoxyethylene ether-2400, 1 part of Brüggolit FF6 and deionized water were placed in the reactor, stirred and dissolved, and 21 parts were added dropwise to the reactor. A mixed solution of acrylic acid, 3 parts of 2-methacryloyloxyethyl phosphorylcholine and 4 parts of air-entraining monomer B2, 2 parts of hydrogen peroxide solution, 1 part of thioglycolic acid solution, added dropwise at 45°C for 3 hours, dropwise added After the reaction is completed, the temperature is kept for 1 h, and after the reaction is...

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to an air-entraining type monomer, an air-entraining type water reducer and a preparation method thereof, wherein the air-entraining type monomer is composed of unsaturated acid chloride and hydroxyalkyl quaternary ammonium salt It is prepared by esterification reaction; the water reducing agent comprises: an air-entraining type polymer, the air-entraining type polymer comprises a polymer or a copolymer derived from a monomer, and the monomer comprises an air-entraining type monomer. The air-entraining type monomer provided by the invention and the air-entraining type water reducing agent prepared by using the air-entraining type monomer can improve the dispersion retention of concrete and the foam stabilization performance of bubbles in concrete. The long-chain alkyl quaternary ammonium The salt structure has the effect of antibacterial and antiseptic, which can prevent the mildew of the superplasticizer, prolong the storage time, reduce the curling of the superplasticizer molecule in an alkaline environment, and improve the retention time of the stretched conformation of the superplasticizer molecule, which has a wide market. application prospects.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an air-entraining monomer, an air-entraining 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. The demand for concrete durability generally requires compound air-en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F222/22C08F220/20C07C219/08C07C213/06C04B24/26C04B103/30
CPCC08F283/065C07C219/08C07C213/06C04B24/2652C04B24/2658C04B24/2694C04B2103/302C08F220/06C08F230/02C08F222/102C08F220/20
Inventor 钟丽娜王昭鹏方云辉柯余良张小芳
Owner KZJ NEW MATERIALS GROUP CO LTD
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