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A highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application

一种减水剂、适应性的技术，应用在高适应性降粘型聚羧酸减水剂及其制备领域，能够解决无法降低高强混凝土粘度、不利工业化规模生产、性能提升不明显等问题，达到减水率高、时间短、保坍性能好的效果

Active Publication Date: 2021-09-28
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this method is cumbersome, the cost of raw materials is high, and it is easy to obtain diene-based macromonomers when unsaturated acids react with polyamide-imines, which will lead to cross-linked gels in the system during the last step of free radical polymerization, which is not conducive to industrial scale production
[0010] Most of the technical methods reported in the above patents have disadvantages such as high cost of raw materials, complicated production process, difficulty in industrialization, and insignificant performance improvement.
Therefore, it is necessary to develop a new type of water reducer product with simple process, low cost and excellent performance, so as to solve the problems that polycarboxylate water reducer has poor adaptability to materials and cannot reduce the viscosity of high-strength concrete encountered in actual projects.

Method used

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  • A highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application
  • A highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application
  • A highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of the main chain: In a four-necked flask equipped with a thermometer and a mechanical stirrer, add 138g (1.0mol) of o-hydroxybenzoic acid, 65g (0.20mol) of phenylphosphoric acid monomer P-1, and ethylenediamine 6g (0.10mol) and 100g of water, mix well, put the flask into a constant temperature oil bath at 100°C, then add 114g (1.4mol) of 37% formaldehyde solution dropwise to the flask, dropwise for 1h, keep warm after dropping After 7 hours of reaction, the main chain polymer can be obtained;

[0052] (2) Introduction of side chains: lower the temperature of the reaction flask to 30°C, then add 900 g (0.18 mol) of epoxy group-terminated polyether macromonomers with a molecular weight of 5000 at one time, keep the reaction for 2 hours, add 1200 g of water to dilute, Obtain the highly adaptable viscosity-reducing polycarboxylate water reducer, tested by GPC, the weight average molecular weight M w It is 39200, and the molecular weight distribution coeffi...

Embodiment 2

[0054] (1) Preparation of the main chain: In a four-necked flask equipped with a thermometer and a mechanical stirrer, add 138g (1.0mol) of m-hydroxybenzoic acid, 124.8g (0.40mol) of phenylphosphoric acid monomer P-2, Mix 6g (0.10mol) of amine and 160g of water evenly, put the flask into a constant temperature oil bath at 100°C, then add 130g (1.6mol) of 37% formaldehyde solution dropwise to the flask, dropwise for 1h, and keep the temperature for 7h. The main chain polymer can be obtained;

[0055] (2) Introduction of side chains: lower the temperature of the reaction flask to 40°C, then add 600 g (0.15 mol) of an epoxy group-terminated polyether macromonomer with a molecular weight of 4000 at one time, keep the reaction for 2 hours, add 850 g of water to dilute, Obtain the highly adaptable viscosity-reducing polycarboxylate water reducer, tested by GPC, the weight average molecular weight M w It is 34200, and the molecular weight distribution coefficient is 2.42.

Embodiment 3

[0057] (1) Preparation of the main chain: In a four-necked flask equipped with a thermometer and a mechanical stirrer, add 138g (1.0mol) of p-hydroxybenzoic acid, 249.6g (0.80mol) of phenylphosphoric acid monomer P-3, diethylene 30.9g (0.30mol) of triamine and 100g of water, mix evenly, put the flask into a constant temperature oil bath at 100°C, then add 262g (2.2mol) of 37% acetaldehyde solution dropwise to the flask, dropwise for 1h, keep warm After reacting for 9 hours, the main chain polymer can be obtained;

[0058] (2) Introduction of side chains: lower the temperature of the reaction flask to 50°C, then add 2400 g (0.60 mol) of epoxy group-terminated polyether macromonomer with a molecular weight of 4000 at one time, keep the reaction for 2 hours, add 2650 g of water to dilute, Obtain the highly adaptable viscosity-reducing polycarboxylate water reducer, tested by GPC, the weight average molecular weight M w It is 30500, and the molecular weight distribution coefficie...

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Abstract

The invention discloses a highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application. The composition is composed of 30-50 wt% polymer and water, and the polymer main chain contains hydrophobic Cyclic and hydrophilic amines, with strong rigidity and good solubility in aqueous solution, and rich in carboxyl / phosphonic acid groups. The highly adaptable viscosity-reducing polycarboxylate water-reducer of the invention has excellent water-reducing and slump-retaining properties, and is suitable for general construction projects and commercial concrete projects. And compared with the conventional polycarboxylate superplasticizer, the highly adaptable viscosity-reducing polycarboxylate superplasticizer of the present invention has strong adaptability to concrete materials, and can effectively reduce the viscosity of high-strength concrete (C50~C100). The high-end superplasticizer market has a bright application prospect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application. [0002] technical background [0003] Polycarboxylate superplasticizer is the most widely researched and used concrete admixture at present. In the case of constant workability of concrete, adding polycarboxylate superplasticizer can effectively save cement consumption, reduce water consumption, and improve concrete strength. In terms of molecular structure, polycarboxylic acid is a comb-shaped polymer, which consists of a main chain rich in carboxylic acid groups and polyether side chains. The carboxylic acid groups on the main chain can be directional adsorbed on positively charged The surface of cement or cement hydrate, and the polyether side chain stretches in the solution to form a hydration layer to provide steric repulsion to prevent cement agglomer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G61/12C04B24/24C08G81/00C08G16/02C08G73/00C08G61/00C04B103/30
CPCC04B24/246C08G81/00C08G16/0243C04B2103/302C08G16/02C04B28/02C04B24/30C04B24/32C08G16/0231
Inventor 刘加平李申桐冉千平杨勇舒鑫周栋梁刘金芝张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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