High-adaptability viscosity reduction type polycarboxylate superplasticizer as well as preparation method and application thereof

An adaptable, superplasticizer technology, applied in the field of highly adaptable viscosity-reducing polycarboxylate superplasticizer and its preparation, can solve the problems of cumbersome process, high cost of raw materials, and insignificant performance improvement.

Active Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-adaptability viscosity reduction type polycarboxylate superplasticizer as well as preparation method and application thereof
  • High-adaptability viscosity reduction type polycarboxylate superplasticizer as well as preparation method and application thereof
  • High-adaptability viscosity reduction type polycarboxylate superplasticizer as well as preparation method and application thereof

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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 high-adaptability viscosity reduction type polycarboxylate superplasticizer as well as a preparation method and application thereof. The invention relates to the polycarboxylate superplasticizer, which is composed of 30-50 wt% of a polymer and water, and the main chain of the polymer contains a hydrophobic benzene ring and a hydrophilic amine, has strong rigidity and goodsolubility in an aqueous solution, and is rich in carboxyl / phosphonic acid group two adsorption groups. The high-adaptability viscosity reduction type polycarboxylate superplasticizer has excellent water reducing and slump retaining properties, and is suitable for general constructional engineering and commercial concrete projects. Compared with a conventional polycarboxylate superplasticizer, the high-adaptability viscosity reduction type polycarboxylate superplasticizer has the advantages that the adaptability to concrete materials is high, the viscosity of high-strength concrete (C50-C100)can be effectively reduced, and the high-adaptability viscosity reduction type polycarboxylate superplasticizer has bright application prospects in the high-end superplasticizer market.

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 Applications(China)
IPC IPC(8): C04B24/24C08G81/00C08G16/02C04B103/30
CPCC04B24/246C04B2103/302C08G16/0243C08G81/00C04B28/02C08G16/02C04B24/30C04B24/32
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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