Preparation method of water reducing agent with hyper-branched topological structure and application of water reducing agent

A topology structure and water-reducing agent technology, applied in the field of building materials, can solve the problems of molecular structure damage of water-reducing agent, economical and environmental protection constraints, high production cost, and achieve small slump loss, low mortar viscosity, The effect of high water reduction rate

Active Publication Date: 2016-05-04
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The superplasticizer has the advantages of excellent performance and strong adaptability, but its polyester structure is easily hydrolyzed in the high alkali environment of cement slurry and concrete, causing the molecular structure of the superplasticizer to be destroyed, affecting its actual performance
[0010] In summary, researchers and technicians in this field have reported a series of preparation methods for hyperbranched concrete water reducers, but these methods have complex processes, high production costs, and instability in cement concrete alkaline environments. problems, its economy and environmental protection restrict its further application

Method used

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  • Preparation method of water reducing agent with hyper-branched topological structure and application of water reducing agent
  • Preparation method of water reducing agent with hyper-branched topological structure and application of water reducing agent
  • Preparation method of water reducing agent with hyper-branched topological structure and application of water reducing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this embodiment, the initiator is Y-1, the monomer C is C-1, the functional reagent E is E-1, and the auxiliary agent Z is sodium hydroxide. The molar ratio of each reactant is: Y-1:B:C-1:Z:E-1=1:70:20:100:110.

[0049] Take 1000g of monomer C-1 and mix it with 398g of monomer B evenly. Under the protection of nitrogen, put 11.58g of initiator Y-1 into the polyether reaction kettle at a constant speed of 58.3g / h at 90°C. After 24h, the addition is completed, and then react at the same temperature for 1h to obtain the intermediate Body D-1 (Mw=1.75×10 4 , conversion rate 96.1%). After cooling to room temperature, add 308g of sodium hydroxide and pretreat at 40°C for 0.5h, add 986g of functionalization reagent E-1, react at 60°C for 6h, and then wash with ethanol-water (2:1v / v) solution 3-5 times, add water to dissolve into a solution with a solid content >20%, and then adjust the pH to 8-9 with hydrochloric acid or liquid caustic soda to obtain a water reducer A-1 ...

Embodiment 2

[0051] In this embodiment, the initiator is Y-1, the monomer C is C-2, the functional reagent E is E-1, and the auxiliary agent Z is sodium hydroxide. The molar ratio of each reactant is: Y-1:B:C-2:Z:E-1=1:110:20:160:180.

[0052] Take 1000g of monomer C-2 and mix it with 407g of monomer B evenly. Under the protection of nitrogen, put 6.70g of initiator Y-1 into the polyether reaction kettle at a constant speed of 58.6g / h at 105°C. After 24h, the addition is completed, and then react at the same temperature for 1.5h to obtain Intermediate D-2 (Mw=2.55×10 4 , conversion rate 95.5%). After cooling to room temperature, add 320g of sodium hydroxide and pretreat at 50°C for 45min, add 1048g of functionalization reagent E-1, react at 75°C for 3h, and then wash with ethanol-water (2:1v / v) solution for 3 -5 times, add water to dissolve into a solution with a solid content>20%, and then adjust the pH to 8-9 with hydrochloric acid or liquid caustic soda to obtain the water reducer A-...

Embodiment 3

[0054] In this embodiment, the initiator is Y-1, the monomer C is C-3, the functional reagent E is E-1, and the auxiliary agent Z is sodium hydroxide. The molar ratio of each reactant is: Y-1:B:C-3:Z:E-1=1:150:20:250:300.

[0055] Take 1000g of monomer C-3 and mix it with 378g of monomer B evenly. Under the protection of nitrogen, put 6.70g of initiator Y-1 into the polyether reactor at a constant speed of 57.4g / h at 120°C. After 24h, the addition is completed, and then react at the same temperature for 2h to obtain the intermediate Body D-3 (Mw=3.65×10 4 , conversion rate 92.3%). After cooling to room temperature, add 250g of sodium hydroxide and pretreat at 60°C for 1h, add 874g of functionalization reagent E-1, react at 90°C for 3h, and then wash with ethanol-water (2:1v / v) solution for 3 -5 times, add water to dissolve into a solution with a solid content>20%, and then adjust the pH to 8-9 with hydrochloric acid or liquid caustic soda to obtain the water reducer A-3 (Mw...

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Abstract

The invention provides a preparation method of a water reducing agent with a hyper-branched topological structure and an application of the water reducing agent. The preparation method has the advantages of simple process and adoption of readily-available raw materials. The obtained water-reducing agent has the advantages of low glue sand viscosity and high clay adaptability. The preparation method comprises the following steps: (1) carrying out an irregular ring-opening copolymerization reaction on glycidol serving as a monomer B and a monomer C with a specific structure in a molar ratio of 3:1-8:1 to obtain a copolymer intermediate D with a hyper-branched structure; (2) substituting a hydroxide radical of the intermediate D with a group having an adsorption function to obtain the water reducing agent with the hyper-branched topological structure, wherein a substitution proportion is 80-90 percent. The water reducing agent serving as a cement dispersant has the advantages of low glue sand viscosity, high cement adaptability, low dosage, high water reducing rate and small slump loss.

Description

technical field [0001] The invention relates to a preparation method and application of a water reducer with a hyperbranched topological structure, belonging to the technical field of building materials. Background technique [0002] In recent years, with the rapid advancement of various infrastructure constructions in my country, the demand for concrete admixtures has grown rapidly. Among the admixtures, the water reducer is used as an admixture to enhance the fluidity of cement and concrete, reduce water consumption, and increase strength. Its development and application technology has attracted much attention. Among them, the high-performance water-reducing agent represented by polycarboxylic acid has attracted extensive attention from the academic circles and the industry due to its high water-reducing performance, low dosage, high slump retention and molecular designability. [0003] Different from the mechanism of action of traditional water reducers such as wood calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/332C08G65/331C08G65/327C08G65/28C04B24/32C04B103/30
CPCC04B24/32C04B2103/302C08G65/2609C08G65/327C08G65/331C08G65/3322
Inventor 严涵冉千平舒鑫杨勇王秀梅刘金芝张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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