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Air-entraining type monomer, air-entraining type 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 problems such as insufficient air-entraining effect of water reducer, prolong storage time, improve foam stability Performance, effect of improving dispersibility and slump retention

Active Publication Date: 2021-04-27
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 type monomer, air-entraining type water reducing agent and preparation method thereof
  • Air-entraining type monomer, air-entraining type water reducing agent and preparation method thereof
  • Air-entraining type monomer, air-entraining type water reducing agent and preparation method thereof

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preparation example Construction

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

[0035] Put the ether macromonomer, reducing agent and appropriate amount of deionized water in the reactor, stir to dissolve, add the mixed solution of unsaturated acid and unsaturated ester, air-entraining monomer solution, oxidant and chain into the reactor dropwise. Transfer agent, and adjust the temperature to 25-50°C for reaction, the dropping time is 1-3h, keep warm for 0.5-1.5h after the dropping, cool down to room temperature after the reaction, adjust the pH to 6-7 with liquid caustic soda, that is Obtain an air-entraining water reducer;

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

[0037] The ether macromonomer is preferably at least one of methallyl polyoxyethylene ether and isopentenyl polyoxyethylene ether;

[0038] The ...

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 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.

[0052] (2) Copolymerization reaction: 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 poured into the reactor Add dropwise the mixed solution of 20 parts of acrylic acid, 2 parts of 2-methacryloxyethyl phosphate and 3 parts of air-entraining monomer B1, 2 parts of hydrogen peroxide solution, and 1 part of thioglycolic acid solution at 25°C. Time 3h, keep warm for 1h after the dropwise addition, cool down to room temperature after th...

Embodiment 2

[0054] (1) Preparation of air-entraining monomer B2: 0.1 mol of octadecyl bis(2-hydroxyethyl) methyl ammonium chloride, 0.1 mol of acryloyl chloride, 45 mL of 1,4 dioxane, 0.1 mol of pyridine In the reactor, under the condition of 15° C., react for 10 h, and the product is purified by vacuum distillation and recrystallization to obtain air-entraining monomer B2.

[0055] (2) Copolymerization reaction: by weight, 200 parts of isopentenyl polyoxyethylene ether-2400, 1 part of Brüggolit FF6 and deionized water are placed in a reactor, stirred and dissolved, and 21 parts of 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, dropwise at 45°C for 3 hours, dropwise After the completion of the heat preservation for 1 hour, after the reaction was completed, the temperature was lowered to room temperature, and the pH was adjusted to 6-7 ...

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Abstract

The invention relates to the technical field of concrete admixtures, particularly to an air-entraining type monomer, an air-entraining type water reducing agent and a preparation method of the air-entraining type water reducing agent, wherein the air-entraining type monomer is prepared from unsaturated acyl chloride and hydroxyl alkyl quaternary ammonium salt through an esterification reaction. The water reducing agent comprises an air-entraining polymer, which comprises a polymer or copolymer derived from a monomer, and the monomer comprises the air-entraining type monomer. According to the invention, the air-entraining type monomer and the air-entraining type water reducing agent prepared from the air-entraining type monomer provided by the invention can improve the dispersion retentivity of concrete and the foam stabilizing performance of bubbles in the concrete, and the introduced long-chain alkyl quaternary ammonium salt structure has antibacterial and anticorrosive effects, and can prevent the water reducing agent from mildewing so as to prolongs the storage time, the curling of water reducing agent molecules in an alkaline environment is reduced, the retention time of molecular stretching conformation of the water reducing agent is prolonged, and a wide market application prospect is achieved.

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 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. The demand for concrete durability generally requires the compounding of air-entraining...

Claims

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Application Information

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Patent Type & Authority Applications(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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